A rotary drilling casing rotation boost follow-up device

Abstract

The utility model provides a kind of rotary drilling protection cylinder rotary boost follow-up device, including rotary follow-up mechanism, foundation steel protection cylinder and sectional steel protection cylinder;The top end of the rotary follow-up mechanism is installed to the drill rod of rotary drilling machine, and the bottom end of the rotary follow-up mechanism is connected with foundation steel protection cylinder;Foundation steel protection cylinder and sectional steel protection cylinder are sequentially arranged from bottom to top;Foundation steel protection cylinder is drilled into ground bottom by being connected with rotary drilling machine, sectional steel protection cylinder is connected with foundation steel protection cylinder, the top end of rotary drilling machine and sectional steel protection cylinder is connected to realize that sectional steel protection cylinder is drilled into ground bottom, and foundation steel protection cylinder is simultaneously acted to make it continue to sink in.The utility model solves the problems of shrinkage, hole collapse and other problems caused by negative pressure during the lifting process of drill bucket.

Description

Technical Field

[0001] This utility model belongs to the field of water conservancy construction, and in particular relates to a rotary drilling casing rotation booster follow-up device. Background Technology

[0002] In water conservancy projects, the construction of large pumping stations often involves pile foundation construction under complex geological conditions, especially in strata where deep soft soil and highly permeable sand layers intersect, significantly increasing the construction difficulty. Taking a pumping station project in a flood detention area as an example, its foundation treatment requires the completion of approximately 5,000 cast-in-place piles. The geological conditions mainly include silty clay, silty clay, and underlying sandy loam and gravel layers, exhibiting an overall characteristic of "soft on top and sandy underneath." Due to the complex regional geological conditions and the high permeability coefficient in the middle and lower parts, the contact area between the drill barrel and the soil is relatively large during rotary drilling. In soft soil, if the drilling depth is large, the lifting process of the drill bucket can easily generate negative pressure, which increases the load on the rotary drilling machine and is detrimental to the stability of the borehole wall, easily causing problems such as borehole diameter reduction and collapse. To overcome the problems of diameter reduction and hole collapse, during rotary drilling construction, a long casing is usually driven into the ground in advance using a drilling and pulling machine after the positioning is determined. It is necessary to pass through permeable layers such as fine sand layers, and the casing is used instead of mud slurry for wall protection. However, the verticality of the extended casing is difficult to control when it is driven into the ground by the drilling and pulling machine, which will affect the verticality quality of the pile foundation. Utility Model Content

[0003] In view of this, the present invention aims to propose a rotary drilling casing rotation booster follow-up device, which sinks the long casing into the ground in sections as the rotary drilling hole is excavated. During the process, the center of the drilling rig and the center of the casing can be precisely controlled to be completely aligned by a plumb bob, eliminating the verticality error of the pile. Furthermore, during the drilling process, the casing sinks with the excavation depth, and the casing replaces the mud slurry for wall protection, solving the problems of hole diameter reduction and hole collapse caused by the negative pressure generated during the drilling bucket lifting process.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows: A rotary drilling rig casing rotation booster follow-up device includes a rotation follow-up mechanism, a base steel casing, and segmented steel casings; The top end of the rotary follow-up mechanism is installed on the drill rod of the rotary drilling rig, and the bottom end of the rotary follow-up mechanism is connected to the foundation steel casing. The basic steel casing and the segmented steel casing are installed sequentially from bottom to top; The basic steel casing is drilled into the ground by connecting the rotary drilling rig to the foundation steel casing. The segmented steel casing is connected to the foundation steel casing. The top of the rotary drilling rig is connected to the segmented steel casing to drill into the ground along with the rotary drilling rig, and at the same time, it acts on the foundation steel casing to make it continue to sink.

[0005] Furthermore, the rotating following mechanism includes an upper following cylinder and a lower following cylinder connected end to end, and the circumferential surface of the top of the upper following cylinder is provided with four evenly distributed upper cylinder fixing holes. The rotating follow-up mechanism is fixedly connected to the rotary drilling rig by passing a steel pin through the fixing hole of the upper cylinder pin and the fixing hole of the drill rod. The bottom circumferential surface of the following lower cylinder is provided with several lower cylinder fixing holes. A steel pin passes through the lower cylinder fixing holes, the base steel casing, or the segmented steel casing in sequence to achieve a fixed connection between the rotating following mechanism and the base steel casing or the segmented steel casing.

[0006] Furthermore, the outer diameter of the upper follower cylinder is smaller than that of the lower follower cylinder; the inner diameter of the upper follower cylinder is equal to that of the lower follower cylinder; and a reinforcing plate is provided at the connection between the upper follower cylinder and the lower follower cylinder.

[0007] Furthermore, a reinforcing ring is provided in the middle of the lower follower cylinder, and the inner surface of the reinforcing ring is connected to the lower follower cylinder by a number of reinforcing plates.

[0008] Furthermore, the surface of the following lower cylinder is provided with several vent holes.

[0009] Furthermore, a steel pin lock is provided at the opening of the lower cylinder fixing hole, and the steel pin inserted into the lower cylinder fixing hole is a crank-type steel pin. The steel pin lock consists of a first locking ring and a second locking ring. The first locking ring and the second locking ring are connected by a connecting part, and there is a lock gap between the first locking ring and the second locking ring. The second locking ring is fixedly connected to the opening of the lower cylinder fixing hole. The first locking ring has a notch; The crank-type steel pin includes a handle, a pin body, and a locking rod; the handle is fixedly connected to the pin body, and the locking rod is vertically installed on the surface of the pin body; The pin of the crank-type steel pin passes through the steel pin lock, the lower cylinder fixing hole, the basic steel protective cylinder or the segmented steel protective cylinder in sequence, and the locking rod passes through the notch of the first locking ring at the same time. Turning the handle causes the locking rod to enter the locking gap, thus locking the crank-type steel pin to the steel pin lock.

[0010] Furthermore, the top circumferential surface of the basic steel casing is provided with several through holes; The segmented steel casing has an insertion port at the bottom for insertion into the top of the base steel casing to form a connection, and the insertion port also has several through holes; the top of the segmented steel casing also has several through holes in the circumferential direction. The segmented steel casing and the basic steel casing are connected by bolts.

[0011] Furthermore, there is one basic steel casing, which is located at the bottom; and there is one or more segmented steel casings, which are located above the basic steel casing.

[0012] Compared with the prior art, the rotary drilling rig casing rotation booster follow-up device of this utility model has the following advantages: (1) The rotary drilling casing rotation booster follow-up device of this utility model can sink the casing into the soil in sections and control the sinking depth of the casing at any time. It is applicable to pile hole drilling in fine sand layers and gravel layers of different depths.

[0013] (2) The rotary drilling casing rotation booster follow-up device described in this utility model, when the rotary drilling rig is excavating, the drill rod rotates and drives the booster device to synchronously follow the pile hole depth into the soil in segments. Compared with the one-time pile driving of the driving and pulling machine, the verticality of the casing sinking can be controlled by checking the drill rod of the drilling rig with a plumb bob during the process, which improves the verticality accuracy of the pile.

[0014] (3) The rotary drilling casing rotation booster follow-up device described in this utility model overcomes the problem of the large contact area between the drill casing and the soil during the rotary drilling process, which reduces mud wall protection and the negative pressure generated by the lifting process of fine sand on the hole wall, causing diameter reduction and hole collapse. Attached Figure Description

[0015] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings: Figure 1 This is a schematic diagram of the operation of a rotary drilling rig casing rotation booster follow-up device according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of the rotary following mechanism described in an embodiment of the present utility model; Figure 3 This is a schematic diagram of the basic steel casing described in an embodiment of the present utility model; Figure 4 This is a schematic diagram of the segmented steel casing described in an embodiment of the present utility model; Figure 5 This is a schematic diagram of the steel pin lock according to an embodiment of the present utility model; Figure 6 This is a schematic diagram of the crank-type steel pin described in an embodiment of this utility model.

[0016] Explanation of reference numerals in the attached figures: 1. Rotary following mechanism; 11. Following upper cylinder; 111. Upper cylinder fixing hole; 12. Following lower cylinder; 13. Reinforcing plate; 14. Reinforcing ring; 15. Reinforcing plate; 16. Vent hole; 17. Steel pin lock; 171. No. 1 locking ring; 172. No. 2 locking ring; 173. Lock gap; 174. Notch; 18. Crank-type steel pin; 181. Handle; 182. Pin body; 183. Locking rod; 2. Basic steel casing; 3. Segmented steel casing; 31. Insert. Detailed Implementation

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0018] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] A rotary drilling rig casing rotation booster follow-up device, such as Figures 1-6 As shown, it includes a rotating follow-up mechanism 1, a basic steel casing, and a segmented steel casing 3; The top end of the rotary follow-up mechanism 1 is installed on the drill rod of the rotary drilling rig, and the bottom end of the rotary follow-up mechanism 1 is connected to the foundation steel casing. The basic steel casing and the segmented steel casing 3 are arranged sequentially from bottom to top; The basic steel casing is drilled into the ground by connecting the rotary drilling rig to the basic steel casing. The segmented steel casing 3 is connected to the basic steel casing. The top of the rotary drilling rig is connected to the segmented steel casing 3 to drill into the ground along with the rotary drilling rig, and at the same time, it acts on the basic steel casing to make it continue to sink.

[0022] Preferably, the rotating following mechanism 1 includes a following upper cylinder 11 and a following lower cylinder 12 connected end to end, and the circumferential surface of the top of the following upper cylinder 11 is provided with four evenly distributed upper cylinder fixing holes 111. The rotating follow-up mechanism 1 is fixedly connected to the rotary drilling rig by passing a steel pin through the fixing hole of the upper cylinder pin and the fixing hole of the drill rod. The bottom circumferential surface of the following lower cylinder 12 is provided with several lower cylinder fixing holes. A steel pin passes through the lower cylinder fixing holes, the base steel casing or the segmented steel casing 3 in sequence to achieve a fixed connection between the rotating following mechanism 1 and the base steel casing or the segmented steel casing 3.

[0023] The outer diameter of the upper follower cylinder 11 is smaller than the outer diameter of the lower follower cylinder 12; the inner diameter of the upper follower cylinder 11 and the inner diameter of the lower follower cylinder 12 are equal; a reinforcing plate 13 is provided at the connection between the upper follower cylinder 11 and the lower follower cylinder 12.

[0024] Preferably, a reinforcing ring 14 is provided in the middle of the following lower cylinder 12, and the inner surface of the reinforcing ring 14 is connected to the following lower cylinder 12 by a number of reinforcing plates 15, which can improve the overall strength of the rotary propulsion mechanism and prevent deformation during operation.

[0025] Preferably, the surface of the follow-up lower cylinder 12 is provided with a plurality of vent holes 16 for venting during sinking.

[0026] Preferably, a steel pin lock 17 is provided at the opening of the lower cylinder fixing hole of the lower cylinder 12, and the steel pin inserted into the lower cylinder fixing hole is a crank-type steel pin 18. The steel pin lock 17 consists of a first locking ring 171 and a second locking ring 172, which are connected by a connecting part and have a locking gap 173 between them. The second locking ring 172 is fixedly connected to the opening of the lower cylinder fixing hole; the first locking ring 171 has a notch 174. The crank-type steel pin 18 includes a handle 181, a pin body 182, and a locking rod 183; the handle 181 is fixedly connected to the pin body 182, and the locking rod 183 is vertically installed on the surface of the pin body 182. The pin 182 of the crank-type steel pin 18 passes through the steel pin lock 17, the lower cylinder fixing hole, the basic steel protective cylinder or the segmented steel protective cylinder 3 in sequence, and the locking rod 183 passes through the notch 174 of the first locking ring 171 at the same time. Rotating the handle 181 causes the locking rod 183 to enter the locking gap 173, thereby locking the crank-type steel pin 18 with the steel pin lock 17. By setting a locking mechanism, the stability of the connection between the steel casing and the rotary propulsion mechanism can be improved.

[0027] Preferably, the top circumferential of the basic steel casing is provided with several through holes; The segmented steel casing 3 has a socket 31 at its bottom for insertion into the top of the base steel casing to form a connection, and the socket 31 also has several through holes; the top of the segmented steel casing 3 also has several through holes in the circumferential direction; the segmented steel casing 3 and the base steel casing are connected by bolts, which facilitates later removal.

[0028] Preferably, there is one basic steel casing, which is located at the bottom; there is one or more segmented steel casings 3, which are located above the basic steel casing, with the basic steel casing at the bottom. The number of segmented steel casings 3 is set according to the required sinking depth.

[0029] Example: The foundation treatment of the newly built Huayang River Pumping Station, part of the main construction project of the Huayang River Flood Detention Area (Construction Section I), involves cast-in-place piles. The pumping station's axis is parallel to the centerline of the old Huayang Sluice Gate, located inside the Tongma Dike. The designed drainage flow rate is 130 m³ / s, and the entire Huayang Pumping Station requires approximately 5,000 foundation piles. The engineering geological soil layers mainly consist of silty clay, clay, sandy loam, silty clay, alternating layers of loam and sand, fine sand containing silt, fine sand, and gravel layers. Within the pumping station excavation area, the soil is composed of silty clay and silty clay. The lower part and bottom of the foundation pit contain permeable layers such as sandy loam and alternating layers of loam and sand, resulting in an overall geological structure of "soft on top and sandy below." When the rotary drilling rig is in place, the rotary follow-up mechanism 1 is installed on the drill rod of the rotary drilling rig and fixed to the drill rod with steel pins. Then, the 3m / section foundation steel casing is fixed to the rotary follow-up mechanism 1 with a crank-type steel pin 18. The rotary drilling rig drills the hole through the center point. The rotary follow-up mechanism 1 rotates synchronously to drive the foundation steel casing to sink into the soil. Its sinking depth is consistent with the drilling depth. During the process, the verticality of the foundation steel casing is controlled by checking the drill rod of the drilling rig with a plumb bob, so as to ensure that the verticality of the pile body meets the specifications and reduce the mud wall protection when the drilling rig is drilling in the fine sand layer and the hole shrinkage and hole collapse caused by the negative pressure generated during the lifting process. Connect the segmented steel casing 3 to the foundation steel casing as needed for the required sinking depth. Then, drive the segmented steel casing 3 and the foundation steel casing together into the ground using a rotary drilling rig. Stop drilling when the segmented steel casing 3 protrudes 50cm above the ground. Once the rotary drilling rig has completed the hole, a guide pipe is installed under the pile driver for cleaning and inspection. After passing inspection, concrete is poured into the pile hole through the guide pipe, ensuring it is 50cm higher than the design elevation. Finally, the drill rod of the rotary drilling rig is reversed to lift the casing section by section out of the ground, completing the entire process of follow-up construction of the entire pile casing.

[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

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