A cobble layer rotary jet drilling device and drilling method

Abstract

The application discloses a cobble layer rotary jet drilling equipment and a drilling method, and belongs to the technical field of stratum drilling. The drilling equipment comprises a hollow drilling cylinder, the drilling cylinder comprises a drill bit and a cylinder body fixedly connected with the drill bit, the outer diameter of the cylinder body is smaller than the outer diameter of the drill bit, a plurality of grouting rods are fixedly arranged on the outer wall of the cylinder body in a circumferential direction with the cylinder body axis as the center, a plurality of grouting holes are arranged side by side on the grouting rods in the cylinder body axis direction, the circumferential outer diameter formed by the plurality of grouting rods is smaller than the outer diameter of the drill bit, a sliding groove is formed between the two adjacent grouting rods, a sliding rod capable of sliding in the radial direction of the cylinder body is limitingly and slidably connected in the sliding groove, and the outer wall of the sliding rod is located on the same arc surface with the outer wall of the drill bit when the sliding rod slides away from the cylinder body. In the process of rotating the drilling cylinder, the slurry can be "painted" along the inner wall of the hole through the sliding rod; after the concrete is initially cured, the sliding rod is slid towards the cylinder body axis, so that the sliding rod is separated from the inner wall of the hole, and the drilling cylinder is convenient to take out.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of stratum drilling, and particularly relates to a pebble layer rotary jet drilling device and a drilling method. BACKGROUND

[0002] A bored pile foundation engineering is a foundation treatment technology, which forms a pile foundation by drilling a hole in the ground and pouring concrete into it to enhance the bearing capacity and stability of the foundation. This technology is widely used in construction engineering, especially in heavy load-bearing or complex geological conditions. When this engineering is carried out in a pebble layer terrain, the pebble layer has large pores and loose strata. The pore wall of the pebble layer is prone to deformation or collapse during drilling or after drilling due to the lack of sufficient cohesive force. During the process of applying mixed concrete after drilling, the concrete is prone to fall off or be uneven due to the instability of the pore wall, affecting the quality of subsequent construction.

[0003] In the prior art, a pebble stratum drilling device disclosed in CN119244159B is used to flow quick-drying concrete along the flow channel of the drill cylinder into the space between the drill cylinder and the drill hole. The rotation of the drill cylinder can squeeze the concrete into the pebble layer to prevent the pebble layer from collapsing. However, after the quick-drying concrete solidifies, the drill cylinder is tightly surrounded by the solidified concrete because it is in close contact with the inner wall of the drill hole, making it difficult to remove the drill cylinder.

[0004] Therefore, it is necessary to provide a pebble layer rotary jet drilling device and a drilling method to solve the above problems. SUMMARY

[0005] Therefore, the present application provides a pebble layer rotary jet drilling device and a drilling method to solve the problem that the concrete is easily squeezed into the pebble layer by the rotation of the drill cylinder, making it difficult to remove the drill cylinder.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0007] The present application provides a pebble layer rotary jet drilling device, which comprises a hollow drill cylinder. The drill cylinder comprises a drill bit and a cylinder body fixedly connected to the drill bit. The outer diameter of the cylinder body is smaller than the outer diameter of the drill bit. A plurality of grouting rods are fixedly arranged on the outer wall of the cylinder body in a circumferential direction with the cylinder body axis as the center. A plurality of grouting holes are arranged side by side on the grouting rods in the direction of the cylinder body axis. The circumferential outer diameter formed by the plurality of grouting rods is smaller than the outer diameter of the drill bit. A sliding groove is formed between the adjacent two grouting rods. A sliding rod capable of sliding in the radial direction of the cylinder body is limitingly and slidably connected in the sliding groove. When the sliding rod slides away from the cylinder body, the outer wall of the sliding rod is located on the same circular arc surface as the outer wall of the drill bit.

[0008] Further, the pebble layer rotary jet drilling equipment further comprises a base fixedly installed on the top surface of the pebble layer, and a positioning sleeve sleeved on the outer wall of the barrel is slidably connected to the base; a first inclined edge inclined downward is arranged on the top wall of the slide rod on the side away from the axis of the barrel, and a second inclined edge inclined downward is arranged on the top wall of the slide rod on the side close to the axis of the barrel; a first push rod matched with the first inclined edge of each slide rod is fixedly arranged on the bottom wall of the positioning sleeve; downward pushing of the positioning sleeve can make the first push rod press the first inclined edge to make the slide rod slide in the direction close to the axis of the barrel; a sliding ring capable of being limitedly slid along the axis direction of the barrel is slidably arranged on the top wall of the barrel; a second push rod matched with the second inclined edge of each slide rod is fixedly arranged on the bottom wall of the sliding ring; downward pushing of the sliding ring can make the second push rod press the second inclined edge to make the slide rod slide in the direction away from the axis of the barrel.

[0009] Further, a fixing sleeve is threadedly connected to the base, and the positioning sleeve is limitingly rotationally connected to the fixing sleeve.

[0010] Further, cavities corresponding to the grouting holes are arranged in the grouting rods, and a closing plate capable of closing the grouting holes is rotationally connected in the cavities; a gear corresponding to each cavity is rotationally connected to the outer wall of the grouting rod; a threaded rod is fixedly connected to one end of the gear; the threaded rod is threadedly connected to the grouting rod; a fixing rod is coaxially fixedly connected to the threaded rod and extends into the cavity and is limitingly slidably connected to the closing plate; a plurality of racks corresponding to the grouting rods are circumferentially arranged on the positioning sleeve with the axis of the positioning sleeve as the center, and the racks can be engaged with the gears.

[0011] Further, limit grooves are arranged on the opposite two side walls of the sliding groove, a connecting rod matched with the limit grooves is fixedly arranged on the slide rod, and the connecting rod is limitingly slidably connected in the limit groove; when the connecting rod slides to the side away from the axis of the barrel, the outer wall of the slide rod is located on the same arc surface as the outer wall of the drill bit; when the connecting rod slides to the side close to the axis of the barrel, the outer walls of the plurality of slide rods form a circle with a diameter larger than that of the plurality of grouting rods; a key groove matched with the slide rod is arranged on the positioning sleeve.

[0012] Further, the drill bit is detachably fixedly connected to the bottom end of the barrel by bolts.

[0013] A drilling method of a pebble layer rotary jet drilling equipment, comprising the following steps:

[0014] S1: fixing the base on the hole position where drilling is to be performed, then fixedly connecting the drill bit and the barrel by bolts to form a drilling barrel, sleeving the positioning sleeve on the barrel close to the drill bit, and making the closing plate close the grouting hole by rotating the gear;

[0015] S2: sliding the sliding ring downwards to make the second push rod extrude the second inclined side to make the slide rod slide in the direction away from the axis of the barrel, until the outer wall of the slide rod is located on the same arc surface with the outer wall of the drill bit, and then fixing the sliding ring;

[0016] S3: drilling down through the drill barrel, wherein, during the drilling down of the drill barrel, the barrel drives the gear to move downwards, and the gear can rotate to drive the closing plate to rotate to open the grouting hole, and the concrete is injected into the grouting rod through the grouting device and sprayed out from the opened grouting hole;

[0017] S4: after the drill barrel is drilled to the designed depth, the drill barrel is continuously rotated for a preset time, and the grouting device continuously injects the concrete to spray out from the grouting hole within the preset time;

[0018] S5: sliding the sliding ring upwards to make the second push rod disengage from the slide rod, then rotating the fixing sleeve to drive the positioning sleeve to slide downwards, so that the first push rod extrudes the first inclined side to make the slide rod slide in the direction close to the axis of the barrel, so that the plurality of slide rods are synchronously disengaged from the inner wall of the pebble layer hole, and then the drill barrel is taken out; wherein, during the taking out of the drill barrel, the gear passing through the rack rotates to drive the closing plate to close the grouting hole.

[0019] The beneficial effects of the present application are:

[0020] The present application sets a gap between adjacent slide rods through the setting of the sliding groove, so that the concrete slurry can be sprayed from the grouting hole to the inner wall of the pebble layer hole through the gap, and the slurry can be "painted" along the inner wall of the hole through the slide rod during the rotation of the drill barrel; after the initial setting of the concrete, the slide rod is slid in the direction close to the axis of the barrel to make the slide rod disengage from the inner wall of the hole, so as to facilitate the taking out of the drill barrel.

[0021] Other advantages, objects, and features of the present application will be apparent to those skilled in the art from the following specification, and will be learned from the practice of the present application. The objects and other advantages of the present application can be realized and obtained by the following specification. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to make the purposes, technical solutions and beneficial effects of the present application clearer, the present application provides the following drawings for illustration:

[0023] Figure 1 is a drilling profile view of the rotary spraying drilling device of the embodiment of the present application;

[0024] Figure 2 is a partial view of the rotary spraying drilling device of the embodiment of the present application; Figure 1 is an enlarged view of the partial A;

[0025] Figure 3A top view of a partial cross-section of the barrel when the sliding rod slides to the side away from the barrel axis of the embodiment of the present application;

[0026] Figure 4 A top view of a partial cross-section of the barrel when the sliding rod slides to the side close to the barrel axis of the embodiment of the present application;

[0027] Figure 5 An installation schematic of the closing plate of the embodiment of the present application.

[0028] In the drawings, the following signs are marked: drill bit 1, barrel 2, sliding groove 201, sliding ring 202, second push rod 203, limiting groove 204, grouting rod 3, grouting hole 301, cavity 302, closing plate 303, gear 304, threaded rod 305, fixed rod 306, sliding rod 4, first inclined edge 401, second inclined edge 402, connecting rod 403, base 5, fixed sleeve 501, positioning sleeve 502, first push rod 503, rack 504. DETAILED DESCRIPTION

[0029] As Figures 1-5 shown, the present application provides a pebble layer rotary jet drilling device, which comprises a hollow drill barrel, the drill barrel comprises a drill bit 1 and a barrel 2 fixedly connected with the drill bit 1, the outer diameter of the barrel 2 is smaller than the outer diameter of the drill bit 1, a plurality of grouting rods 3 are fixedly arranged on the outer wall of the barrel 2 in a circumferential direction with the axis of the barrel 2 as the center, a plurality of grouting holes 301 are arranged side by side on the grouting rods 3 in the direction of the axis of the barrel 2, the outer diameter of the circumference formed by the plurality of grouting rods 3 is smaller than the outer diameter of the drill bit 1, a sliding groove 201 is formed between the adjacent two grouting rods 3, a sliding rod 4 capable of sliding in the radial direction of the barrel 2 is limitingly and slidably connected in the sliding groove 201, and when the sliding rod 4 slides to the side away from the barrel 2, the outer wall of the sliding rod 4 is located on the same circular arc surface as the outer wall of the drill bit 1.

[0030] In the present scheme, when the drill barrel is drilled, the sliding rod 4 is slid to make the outer wall of the sliding rod 4 located on the same circular arc surface as the outer wall of the drill bit 1, after the drill barrel is drilled, the pebbles in the drill barrel are removed by other equipment to form a preliminary drilled hole, after drilling to the designated position, concrete is injected into the grouting rods 3 by a grouting device, is sprayed to the inner wall of the pebble layer hole through the grouting holes 301, and the drill barrel is synchronously rotated to make the inner wall of the hole uniformly sprayed with concrete, and due to the arrangement of the sliding groove 201, a gap is arranged between the adjacent sliding rods 4, so that the concrete slurry can be sprayed from the grouting holes 301 to the inner wall of the pebble layer hole through the gap, and in the process of rotating the drill barrel, the slurry can be "painted" along the inner wall of the hole by the sliding rod 4; after the initial setting of the concrete, the sliding rod 4 is slid to the side close to the axis of the barrel 2 to make the sliding rod 4 separate from the inner wall of the hole, so as to facilitate the removal of the drill barrel.

[0031] In an embodiment of the present application, the pebble layer rotary jet reaming device further comprises a base 5 fixedly installed on the top surface of the pebble layer, a fixing sleeve 501 is threadedly connected to the base 5, a positioning sleeve 502 is rotationally connected in the fixing sleeve 501, the positioning sleeve 502 is slidingly connected with the base 5, the positioning sleeve 502 is slidingly sleeved on the outer wall of the barrel 2, the top wall of the slide rod 4 is provided with a downward inclined first inclined edge 401 on the side away from the axis of the barrel 2, the top wall of the slide rod 4 is provided with a downward inclined second inclined edge 402 on the side close to the axis of the barrel 2, the bottom wall of the positioning sleeve 502 is fixedly provided with a first push rod 503 matched with the first inclined edge 401 of each slide rod 4, and pushing the positioning sleeve 502 downward can make the first push rod 503 press the first inclined edge 401 to make the slide rod 4 slide in the direction close to the axis of the barrel 2, the top wall of the barrel 2 is slidingly provided with a sliding ring 202, the sliding ring 202 can slide in the axial direction of the barrel 2, and the bottom wall of the sliding ring 202 is fixedly provided with a second push rod 203 matched with the second inclined edge 402 of each slide rod 4, and pushing the sliding ring 202 downward can make the second push rod 203 press the second inclined edge 402 to make the slide rod 4 slide in the direction away from the axis of the barrel 2.

[0032] In the present scheme, the setting of the base 5 and the positioning sleeve 502 can improve the perpendicularity of the drilling barrel during the drilling process, during the drilling process of the drilling barrel, the sliding ring 202 needs to be first slid downward to make the second push rod 203 press the second inclined edge 402 to make the slide rod 4 slide in the direction away from the axis of the barrel 2, until the outer wall of the slide rod 4 and the outer wall of the drill bit 1 are located on the same circular surface, and then the sliding ring 202 is fixed; when the drilling barrel is taken out, the sliding ring 202 needs to be first slid upward to make the second push rod 203 disengage from the slide rod 4, then the fixing sleeve 501 is rotated to drive the positioning sleeve 502 to slide downward, so that the first push rod 503 presses the first inclined edge 401 to make the slide rod 4 slide in the direction close to the axis of the barrel 2, so that the plurality of slide rods 4 are synchronously disengaged from the inner wall of the pebble layer hole, and then the drilling barrel is taken out.

[0033] The present scheme can make the plurality of slide rods 4 slide synchronously through the setting of the positioning sleeve 502 and the sliding ring 202.

[0034] In one embodiment of the present application, the grouting rod 3 is provided with cavities 302 corresponding to the grouting holes 301, the cavities 302 are rotatably connected with closing plates 303 capable of closing the grouting holes 301, the outer wall of the grouting rod 3 is rotatably connected with gears 304 corresponding to the cavities 302, one end of the gear 304 is fixedly connected with a threaded rod 305, the threaded rod 305 is screwed with the grouting rod 3, the threaded rod 305 is coaxially fixedly connected with a fixed rod 306, the fixed rod 306 extends into the cavity 302 and is limitingly and slidably connected with the closing plate 303, the positioning sleeve 502 is provided with a plurality of racks 504 corresponding to the grouting rod 3 on the center line of the positioning sleeve 502, and the racks 504 are capable of engaging with the gears 304.

[0035] In the present scheme, the barrel 2 is first installed in the positioning sleeve 502, the racks 504 are engaged with the gears 304 one by one, then during the drilling process, the barrel 2 drives the gears 304 to move downward, and the gears 304 can rotate to drive the closing plates 303 to rotate and open the grouting holes 301, so that during the drilling process, the concrete can be injected into the grouting rod 3 through the grouting equipment and sprayed out of the opened grouting holes 301, achieving the rotation and spraying during the drilling process, and the gears 304 that do not pass through the racks 504 cannot rotate, so that the grouting holes 301 that do not pass through the racks 504 are in a closed state; during the removal of the barrel 2, the slide rod 4 is first slid to the side close to the axis of the barrel 2 through the slide ring 202 and the positioning sleeve 502, and then the barrel 2 is taken out upward, at this time, the gears 304 that pass through the racks 504 rotate to drive the closing plates 303 to close the grouting holes 301.

[0036] In one embodiment of the present application, the slide groove 201 is provided with a limiting groove 204 on the opposite two side walls, the connecting rod 403 matched with the limiting groove 204 is fixedly arranged on the slide rod 4, and the connecting rod 403 is limitingly and slidably connected in the limiting groove 204; when the connecting rod 403 slides to the side away from the axis of the barrel 2, the outer wall of the slide rod 4 is located on the same circular surface as the outer wall of the drill bit 1; when the connecting rod 403 slides to the side close to the axis of the barrel 2, the outer walls of the plurality of slide rods 4 form a circular circumference with a diameter larger than that formed by the plurality of grouting rods 3; and the positioning sleeve 502 is provided with a key groove matched with the slide rod 4, so that the barrel 2 and the positioning sleeve 502 cannot rotate relative to each other, thereby ensuring that the racks 504 and the gears 304 can be in engagement.

[0037] In one embodiment of the present application, the drill bit 1 is detachably fixedly connected to the bottom end of the barrel 2 by bolts.

[0038] A drilling method of the pebble layer rotation and spraying drilling equipment, comprising the following steps:

[0039] S1: fixing the base 5 on the pre-drilling hole position, then fixing the drill bit 1 and the barrel 2 by bolts to form a drilling barrel, and sleeving the positioning sleeve 502 on the barrel 2 close to the drill bit 1, and closing the injection hole 301 by the closed plate 303 through the rotation of the gear 304;

[0040] S2: sliding the sliding ring 202 downward to make the second push rod 203 extrude the second inclined edge 402 to make the sliding rod 4 slide in the direction away from the barrel axis, until the outer wall of the sliding rod 4 is located on the same circular surface with the outer wall of the drill bit, and then fixing the sliding ring 202;

[0041] S3: drilling down by the drilling barrel, wherein during the drilling down of the drilling barrel, the gear 304 is lowered to pass through the rack 504 to make the gear 304 rotate to drive the closed plate 303 to rotate to open the injection hole 301, and the concrete is injected into the injection rod 3 by the injection equipment and sprayed out from the opened injection hole 301;

[0042] S4: after the drilling barrel is drilled to the designed depth, the drilling barrel is continuously rotated for a preset time, and during the preset time, the injection equipment continuously injects the concrete to spray out from the injection hole 301;

[0043] S5: sliding the sliding ring 202 upward to make the second push rod 203 disengage from the sliding rod 4, then rotating the fixing sleeve 501 to drive the positioning sleeve 502 to slide downward, so that the first push rod 503 extrudes the first inclined edge 401 to make the sliding rod 4 slide in the direction close to the barrel axis, so that the plurality of sliding rods 4 are synchronously disengaged from the inner wall of the pebble layer hole, and then the drilling barrel is taken out; wherein during the taking out of the drilling barrel, the gear 304 passing through the rack 504 rotates to drive the closed plate 303 to close the injection hole 301.

[0044] Finally, it should be pointed out that the above preferred embodiments are only used to illustrate the technical solutions of the present application and are not limiting, although the present application has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present application.

Claims

1. A rotary jet grouting drilling device for pebble layers, comprising a hollow drill cylinder, characterized in that: The drill barrel includes a drill bit and a cylinder body fixedly connected to the drill bit. The outer diameter of the cylinder body is smaller than the outer diameter of the drill bit. Multiple grouting rods are fixedly arranged circumferentially on the outer wall of the cylinder body with the cylinder body axis as the center. Multiple grouting holes are arranged side by side on the grouting rods along the cylinder body axis. The outer diameter of the circle formed by the multiple grouting rods is smaller than the outer diameter of the drill bit. A sliding groove is formed between two adjacent grouting rods. A sliding rod that can slide radially along the cylinder body is slidably connected in the sliding groove. When the sliding rod slides to the side away from the cylinder body, the outer wall of the sliding rod and the outer wall of the drill bit are located on the same arc surface.

2. The pebble layer jet grouting drilling equipment according to claim 1, characterized in that: The pebble layer jet grouting drilling equipment also includes a base fixedly installed on the top surface of the pebble layer, on which a positioning sleeve is slidably connected. The top wall of the sliding rod has a first inclined edge pointing downwards on the side away from the cylinder axis, and a second inclined edge pointing downwards on the side closer to the cylinder axis. The bottom wall of the positioning sleeve is fixedly provided with a first push rod that engages with each of the first inclined edges of the multiple sliding rods. Pushing the positioning sleeve downwards causes the first push rod to press against the first inclined edge, causing the sliding rod to slide in a direction closer to the cylinder axis. The top wall of the cylinder is slidably provided with a sliding ring that can limit sliding along the cylinder axis. The bottom wall of the sliding ring is fixedly provided with a second push rod that engages with each of the second inclined edges of the multiple sliding rods. Pushing the sliding ring downwards causes the second push rod to press against the second inclined edge, causing the sliding rod to slide in a direction away from the cylinder axis.

3. The pebble layer jet grouting drilling equipment according to claim 2, characterized in that: The base is threadedly connected to a fixing sleeve, and the positioning sleeve is rotatably connected to the fixing sleeve for limiting.

4. The pebble layer jet grouting drilling equipment according to claim 3, characterized in that: The grouting rod has cavities corresponding to the grouting holes. A sealing plate that can close the grouting holes is rotatably connected to the cavity. A gear corresponding to the cavity is rotatably connected to the outer wall of the grouting rod. A threaded rod is fixedly connected to one end of the gear. The threaded rod is threadedly connected to the grouting rod. A fixing rod is fixedly connected to the threaded rod coaxially. The fixing rod extends into the cavity and is slidably connected to the sealing plate. Multiple racks corresponding to the grouting rod are arranged circumferentially around the axis of the positioning sleeve. The racks can mesh with the gears.

5. The pebble layer jet grouting drilling equipment according to claim 4, characterized in that: Limiting grooves are provided on the opposite side walls of the sliding groove. A connecting rod that mates with the limiting groove is fixedly provided on the sliding rod. The connecting rod is slidably connected in the limiting groove. When the connecting rod slides to the side of the limiting groove away from the cylinder axis, the outer wall of the sliding rod and the outer wall of the drill bit are located on the same arc surface. When the connecting rod slides to the side of the limiting groove close to the cylinder axis, the circumferential diameter formed by the outer walls of the multiple sliding rods is larger than the circumferential diameter formed by the multiple grouting rods. A keyway that mates with the sliding rod is provided on the positioning sleeve.

6. The pebble layer jet grouting drilling equipment according to claim 1, characterized in that: The drill bit is detachably and fixedly connected to the bottom of the cylinder by bolts.

7. The drilling method of the pebble layer rotary jet drilling equipment according to any one of claims 1-6, characterized in that, Includes the following steps: S1: Fix the base on the pre-drilled hole, then fix the drill bit and the cylinder with bolts to form a drill cylinder, and put the positioning sleeve on the cylinder near the drill bit, and close the grouting hole by rotating the gear. S2: Slide the sliding ring downwards to make the second push rod press the second inclined edge so that the slide rod slides away from the cylinder axis until the outer wall of the slide rod and the outer wall of the drill bit are on the same arc surface, and then fix the sliding ring; S3: Drilling is performed by rotating the drill barrel. During the drilling process, the barrel moves down and the gear moves down through the rack, which causes the gear to rotate and drive the sealing plate to rotate and open the grouting hole. Concrete is then injected into the grouting rod through the grouting equipment and sprayed out from the opened grouting hole. S4: After drilling to the designed depth, continue rotating the drill barrel for a preset time. During the preset time, the grouting equipment continuously injects concrete, which is then sprayed out from the grouting hole. S5: Slide the sliding ring upward to disengage the second push rod from the slide rod, then rotate the fixed sleeve to drive the positioning sleeve downward, thereby causing the first push rod to press the first inclined edge to make the slide rod slide in a direction close to the cylinder axis, thereby causing multiple slide rods to simultaneously disengage from the inner wall of the pebble layer hole, and then remove the drill cylinder; wherein, during the removal of the drill cylinder, the gear passing through the rack rotates, driving the sealing plate to seal the grouting hole.

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