CN217925793U - Internal expansion type fisher for full hydraulic drilling of cast-in-place pile and falling circular drill rod - Google Patents

Abstract

The utility model relates to an all-hydraulic drilling of bored concrete pile falls to bore expanded fisher in circular drilling rod, through aiming at the drill bit with fishing rod, the slider slides until the slider butt is connected in order to realize fishing body and drill bit in the drill bit along distributing in the slide rail top-down of fishing rod periphery, and external drive arrangement will take the fishing rod of drill bit through the connector and fish out to the drill bit that will drop is fished out in the drilling, and whole fishing process is safe, convenient, reliable.

Description

Internal expansion type fisher for full-hydraulic drilling of cast-in-place pile in drop-drilling circular drill rod

Technical Field

The utility model relates to a bored pile construction technical field especially relates to a bored concrete pile is full-hydraulic to be bored and falls to bore circular drilling rod internal expanding fisher in hole.

Background

When large-scale rock-socketed cast-in-place piles such as RCD (reinforced concrete) drilling machines and KTY (Karaoke television) drilling machines are adopted for drilling, large-diameter roller bits are usually adapted to carry out rock drilling construction. However, the drill bit bears a large resistance while providing a large drilling force through the drill rod, and particularly, the resistance of the drill bit is greatly increased when sand gushing, rock falling and the like occur on the wall of the drilled hole. When the acting force borne by the drill rod exceeds the torque strength of the drill rod, the phenomena of separation of the drill bit from the drill rod, breakage of the drill rod body and the like shown in fig. 1 can occur, and the drill bit or the drill bit carrying the broken drill rod falls to the bottom of the hole.

When the drill bit drops, normally submerge to downthehole fishing hook and drill bit be connected through the diver, then upwards stimulate fishing hook and fish out the drill bit, the diver submerges in the connection in-process operational environment dangerous, the connection degree of difficulty is big.

SUMMERY OF THE UTILITY MODEL

Based on this, it is necessary to provide an internal expansion type fisher for dropping a round drill rod in a full-hydraulic drilling hole of a cast-in-place pile, aiming at the technical problems.

An internal expanding fisher for dropping a round drill rod in a full-hydraulic drilling hole of a cast-in-place pile for fishing a drill bit comprises

The fishing body comprises a fishing rod, a plurality of convex strips which are distributed at intervals on the periphery of the fishing rod and extend along the axial direction of the fishing rod, a slide rail arranged on the side part of the convex strips and a slide block movably connected to the slide rail, wherein the slide rail extends along the length direction of the convex strips and deviates from the fishing rod to be obliquely arranged outwards, the slide block is provided with an outwards arranged abutting surface, the abutting surfaces of the slide blocks surround to form a peripheral surface which is in contact with a drill bit, and the diameter of the peripheral surface of the slide block is correspondingly reduced and enlarged when the slide block moves upwards or downwards along the slide rail; and

and one side of the connecting body is connected with an external driving device, and the other side of the connecting body is connected with the fishing body.

The internal expansion type fisher for the circular drill rod falling into the full-hydraulic drilling hole of the cast-in-place pile aims at the drill bit through the fishing rod, the sliding block slides along the sliding rails distributed on the convex strips on the periphery of the fishing rod from top to bottom, the diameter of the periphery of the sliding block is enlarged until the sliding block is tightly pressed on the drill bit to realize connection of the fishing body and the drill bit, the external driving device enables the fishing rod with the drill bit to be fished out through the connecting body, and therefore the falling drill bit is fished out from the drilling hole, and the whole fishing process is safe, convenient and reliable.

Preferably, the fishing rod is externally surrounded by a fishing barrel, the barrel wall of the fishing barrel is provided with an avoiding groove, the avoiding groove is arranged along the axial extension of the fishing rod, the sliding block penetrates through the avoiding groove, and the pressing surface of the sliding block is exposed outside the fishing barrel. Preferably, still include the spacing body, the spacing body is located slide rail tip is in order to prevent the slider breaks away from the slide rail. In one embodiment, the limiting body is positioned at the upper end part of the sliding rail, the lower end part of the sliding rail is positioned in the overshot, the limiting body prevents the sliding block from sliding upwards, and the bottom of the avoiding groove organizes the sliding block to slide downwards; or

The limiting body is positioned at the lower end part of the sliding rail, the upper end part of the sliding rail is positioned in the overshot, the limiting body prevents the sliding block from sliding downwards, and the top of the avoidance groove prevents the sliding block from sliding upwards; or

The limiting bodies are located at two ends of the sliding rail and prevent the sliding block from sliding upwards or downwards.

Preferably, the fishing body is provided with a guide head, the guide head is arranged at the lower end of the fishing barrel, and the guide head axially extends along the fishing barrel and simultaneously radially inwardly contracts.

Preferably, the slide rail includes a sliding portion and a supporting portion, the sliding portion is disposed between the fishing rod and the supporting portion, the sliding block slides in the sliding portion, and the supporting portion presses the sliding block against the drill bit.

Preferably, the convex strip comprises a first side surface and a second side surface, wherein the first side surface and the second side surface are oppositely arranged, and the slide rail is positioned on the first side surface and the second side surface of the convex strip.

Preferably, the sliding rail is a protrusion or a groove arranged on the first side surface and/or the second side surface.

Preferably, the lower end of the sliding block is provided with a guide surface, and the guide surface extends to the outer side surface of the sliding block from the bottom surface of the sliding block to the oblique upper side.

Preferably, the connecting body is a cylindrical flange, and the fishing body is fixedly connected to the cylindrical flange; or

The salvaging body is detachably connected with the cylindrical flange.

Preferably, a reinforcing rib is arranged between the cylindrical flange and the overshot.

Drawings

FIG. 1 is a schematic view of a drill drop;

FIG. 2 is a schematic view of a first state of an internal expansion type fisher for dropping a round drill rod in a full-hydraulic drilling hole of a cast-in-place pile;

FIG. 3 isbase:Sub>A sectional view taken along line A-A of FIG. 2;

FIG. 4 is a partial schematic view of FIG. 2;

FIG. 5 is a schematic view of a second state of the internal expanding type fisher for dropping a round drill rod in a full hydraulic drilling hole of a cast-in-place pile;

fig. 6 is a sectional view taken along the line B-B in fig. 5.

Reference numerals:

10-dropping the round drill rod internal expansion type fisher in the full hydraulic drilling hole of the cast-in-place pile;

100-fishing body; 110-fishing rod; 120-a slide rail; 121-upper end of slide rail; 122-lower end of slide rail; 123-convex strips; 1231-a first side; 1232-second side; 130-a slider; 131-a pressing surface; 132-a connecting portion; 1321-an extension plate; 1322-sliding jaw; 133-a guide surface; 140-an overshot; 141-cylinder wall; 142-an avoidance slot; 1421-upper cell wall; 1422-lower cell wall; 143-a guide head; 150-a spacing body;

200-a linker; 210-cylindrical flange; 220-reinforcing ribs;

300-a drill pipe; 310-an inner hole;

400-a drill bit; 500-drilling.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

With reference to fig. 2-6, the present invention discloses an internal expanding type fisher 10 for a full hydraulic drilling hole of a bored concrete pile to drop into a circular drill rod, which comprises a fishing body 100 for connecting a dropping drill bit 400 and a connecting body 200 for connecting the fishing body 100 to an external driving device. After the fishing body 100 is connected with the drill bit 400, the external driving device pulls out the fishing body 100 with the drill bit 400 from the drill hole 500 through the connecting body 100, so that the drill bit 400 falling into the drill hole 500 can be fished out, and the fishing process of the whole drill bit 400 is safe, convenient and efficient. Specifically, the fishing body 100 includes the fishing rod 110, a plurality of distributions are in the fishing rod 110 periphery and supply the sand grip 123 that the slider reciprocated, the sand grip 123 is along fishing rod 110's peripheral interval arrangement in the time of the axial extension of sand grip 110, the both sides of sand grip 123 are equipped with the slide rail 120 that the direction slider 130 removed respectively, the slide rail extends along the length direction of sand grip 123 and arranges and deviates fishing rod 110 along fishing rod 110 top-down direction slide rail 120 and outwards inclines to arrange, wherein, slider 130 sliding connection is on slide rail 120, the interval enclosure forms the peripheral surface between the face 131 that supports that a plurality of sliders 120 outwards arranged. In the process of using the cast-in-place pile full-hydraulic drilling hole internal-drilling falling circular drill rod internal-expansion fisher 10 to salvage the drill bit, when the cast-in-place pile full-hydraulic drilling hole internal-drilling falling circular drill rod internal-expansion fisher 10 is inside the drill rod 300, the plurality of sliding blocks 130 enter the drill rod 300 along with the fishing rod 110, the plurality of sliding blocks 130 are extruded to move upwards along the sliding rail 120, the diameter of the peripheral surface formed by enclosing the plurality of sliding blocks 130 is reduced, namely, the pressing surface 131 of the sliding block 130 and the inner wall of the drill rod 300 move relatively; when the circular drill rod internal expansion type fisher 10 falls into the full-hydraulic drilling hole of the cast-in-place pile is pulled upwards, the circular drill rod internal expansion type fisher 10 falls into the full-hydraulic drilling hole of the cast-in-place pile moves upwards, the sliding blocks 130 move downwards along the sliding rails 120 under the action of self gravity, the diameter of the peripheral surface formed by enclosing of the sliding blocks 130 is enlarged, and the pressing surfaces 131 of the sliding blocks 130 are fixedly connected with the inner wall of the drill rod 300 in a pressing mode. One side of the connecting body 200 is connected to an external driving device, and the other side is connected to the fishing body 100, and the external driving device can fish the fishing body 100 connected with the drill bit 400 out of the drill hole 500 through the connecting body 100.

In the process of salvaging the drill bit, firstly, the falling circular drill rod internal expansion fisher 10 in the full-hydraulic drilling hole of the cast-in-place pile is aligned with the drill rod 300 and is placed in the drill hole 500 until the falling circular drill rod internal expansion fisher is placed near the drill rod 300, so that the falling circular drill rod internal expansion fisher 10 in the full-hydraulic drilling hole of the cast-in-place pile is connected with the drill rod 300; then, the fishing rod 110 is aligned with the inner hole 310 of the drill rod 300 and is lowered into the inner hole 310, the sliding block 130 firstly moves upwards along the sliding rail 120 for a certain distance and then moves downwards along the sliding rail 120 until the sliding block is firmly abutted against the drill rod 300 in the process that the fishing rod 110 extends into the drill rod 300, and then the fishing body 100 is connected with the drill rod 300; finally, the external driving device pulls the connecting body 200 upward, and then pulls the fishing body 100 and the drill 400 connected to each other out of the borehole 500, thereby completing the fishing of the drill 400. Specifically, because the sliding block 130 is influenced by self gravity, when the fishing rod 110 goes deep into the inner hole 310 of the drill rod, the initial position of the sliding block 130 is located at the bottom of the sliding rail 120, before the sliding block 130 is lowered to the hole of the inner hole 310 of the drill rod along with the drill rod 300, the sliding block 130 is located at the lowest end under the action of self gravity, and the diameter of the peripheral surface formed by the abutting surfaces of the sliding block 130 in a spaced and enclosed mode is larger than the diameter of the hole of the inner hole 310; along with the increase of the depth of the falling circular drill rod internal expansion type fisher 10 in the full-hydraulic drilling hole of the cast-in-place pile, the sliding block 130 is lowered to the opening of the inner hole 310, the drill rod 300 prevents the sliding block 130 from sliding downwards and slides upwards relative to the falling circular drill rod internal expansion type fisher 10 in the full-hydraulic drilling hole of the cast-in-place pile until the sliding block 130 slides upwards relative to the falling circular drill rod internal expansion type fisher 10 in the full-hydraulic drilling hole of the cast-in-place pile until the diameter of the peripheral surface formed by the interval enclosure between the abutting surfaces of the sliding block 130 is equal to or slightly smaller than the diameter of the inner hole 310 of the drill rod, and the sliding block 130 slides into the drill rod 300 along with the falling circular drill rod internal expansion type fisher 10 in the full-hydraulic drilling hole of the cast-in-place pile. When the circular drill rod internal expansion type fisher 10 falls into the full-hydraulic bored hole of the cast-in-place pile is pulled upwards, the sliding block 130 is kept still or moves downwards relative to the fishing rod 110 under the action of self gravity and friction between the sliding block abutting surface 131 and the hole wall of the drill rod inner hole 310, the diameter of the peripheral surface formed by the interval enclosing between the abutting surfaces 131 of the sliding block 130 is increased in the process that the sliding block 130 moves downwards relative to the fishing rod 110, the sliding rail 120 tightly presses the sliding block 130 on the drill rod 300, and the drill rod 300 is connected with the circular drill rod internal expansion type fisher 10 falling into the full-hydraulic bored hole of the cast-in-place pile into a whole through the sliding block 130.

When the fishing rod 110 is used to go deep into the borehole 500 to connect with the drill bit 400, a thinner solid fishing rod is often used in order to reduce the mass of the fishing body 100 and to ensure the tensile strength of the fishing body 100. However, in the process that the fishing rod 100 is deeply drilled into the borehole 500 and connected with the drill rod 300, the diameter of the fishing rod 110 provided with the slide rail 120 is significantly smaller than the diameter of the inner hole 310, and the fishing rod is easily shaken relative to the drill rod 300 when being deeply drilled into the inner hole 310, so that the sliding block 130 is difficult to be aligned and abutted with the inner hole wall of the drill rod 310, the fishing efficiency is affected, and the connection stability between the fishing rod 110 and the drill rod 300 is poor. For the above problems, an overshot 140 adapted to the inner hole 310 is disposed on the outer circumference of the overshot rod 110 (for example, a gap of 10-50cm exists between the overshot 140 and the inner wall of the inner hole 310), an avoiding groove 142 for the sliding block 130 to slide relative to the slide rail 120 is disposed on the cylinder wall 141 of the overshot 140, and the pressing surface 131 of the sliding block is exposed outside the avoiding groove 142 and abuts against the drill rod 300 during the sliding process of the sliding block 130 along the slide rail 120. Specifically, the overshot 140 can be fixedly or detachably connected to the outer side wall of the overshot 110, and the overshot 110 is integrally located inside the overshot 140, wherein the diameter of the overshot 140 is set according to the diameter of the inner bore 310 of the drill rod, for example, the diameter of the overshot 140 is slightly smaller than the inner bore 310 of the drill rod, so that the sliding block 130 exposed from the overshot 140 can slide in. By using a thinner fishing rod 110 and providing an overshot 140 outside the fishing rod 110 that fits into the inner bore 310, the weight of the fishing body 100 can be reduced while ensuring stability of the fishing rod 110 penetrating into the drill rod 300.

Further, in order to prevent the sliding block 130 from sliding out of the end of the sliding rail 120 when sliding to the end of the sliding rail 120, which affects the normal use of the fishing body 100, the end of the sliding rail 120 is provided with a limiting body 150, and when the sliding block 130 slides to the end of the sliding rail 120, the limiting body 150 prevents the sliding block 130 from sliding upwards or downwards to prevent the sliding block 130 from separating from the sliding rail 120. Specifically, the limiting body 150 is a limiting block whose width dimension is greater than the width of the end of the slide rail and/or whose height dimension is greater than the height of the end of the slide rail, or the limiting body 150 is a protrusion disposed on the end of the slide rail 120 to prevent the slide block 130 from sliding. Preferably, the limiting body 150 is located at the upper end portion 121 of the slide rail, and the lower end portion 122 of the slide rail is located partially in the overshot 140, wherein the limiting body 150 can prevent the slide block 130 sliding to the upper end portion 121 of the slide rail from continuously sliding upwards to separate from the slide rail 120, the lower groove wall 1421 of the avoiding groove abuts against the lower end portion of the slide block 130 exposed out of the avoiding groove 142, the lower groove wall 1422 of the avoiding groove prevents the slide block 120 from continuously sliding downwards, and the limiting body 150 and the lower groove wall 1422 of the avoiding groove at the upper end of the slide rail 120 limit the sliding stroke of the slide block 130; or, the limiting body 150 is located at the lower end 122 of the slide rail, and the upper end 121 of the slide rail is located inside the overshot 150, wherein the limiting body 150 can prevent the slider 130 sliding to the lower end 122 of the slide rail from continuously sliding downward and separating from the slide rail 120, the upper groove wall 1421 of the avoiding groove abuts against the upper end of the slider 130 exposed out of the avoiding groove, the upper groove wall 1421 of the avoiding groove prevents the slider 130 from continuously sliding upward, and the limiting body 150 at the lower end of the slide rail 120 and the upper groove wall 1421 of the avoiding groove limit the sliding stroke of the slider 130; or, the position-limiting bodies 150 are located at two ends of the slide rail, and the position-limiting bodies 150 prevent the slide block 130 from sliding upwards or downwards, wherein the position-limiting bodies 150 include a first position-limiting body and a second position-limiting body, the first position-limiting body is located at the upper end portion 121 of the slide rail, the second position-limiting body is located at the lower end portion 122 of the slide rail, the slide block sliding to the upper end portion 121 of the slide rail continues to slide upwards to separate from the slide rail 120, the slide block sliding to the lower end portion 122 of the slide rail 130 continues to slide downwards to separate from the slide rail 120, and further, the stroke of the slide block 130 is limited.

In one embodiment, the bottom of the overshot 140 is provided with a guide head 143, and the guide head 143 is extended along the axial direction of the overshot 140 while being contracted radially inward. Specifically, the guiding head 143 may be a cone, a cylinder, a polygonal pyramid, or a frustum of a pyramid having a smaller lower diameter than an upper diameter. As the fishing body 100 is advanced into the drill pipe inner bore 310, the inwardly sloped outer surface of the guide head 143 guides the overshot 140 to slide into the inner bore 310 and axially and radially align with the drill pipe 300 to facilitate advancement of the fishing body into the interior of the drill pipe 300.

In one embodiment, the protruding strip 123 distributed on the outer wall of the fishing rod 110 includes a first side surface 1231 and a second side surface 1232 opposite to the first side surface 1231, and the sliding rail 120 is disposed on the first side surface 1231 and the second side surface 1232 of the protruding strip 123. The sliding rail 120 is a protrusion or a groove disposed on the first side surface 1231 and/or the second side surface 1232, that is, the sliding rail 120 disposed on the first side surface 1231 is a protrusion, the sliding rail 120 disposed on the second side surface 1232 is a protrusion, or the sliding rail 120 disposed on the first side surface 1231 is a protrusion, the sliding rail 120 disposed on the second side surface 1232 is a groove, or the sliding rail 120 disposed on the first side surface 1231 is a groove, and the sliding rail 120 disposed on the second side surface 1232 is a groove. Specifically, preferably, in order to ensure the stability of the sliding block 130 sliding up and down relative to the sliding rail 120, the first side surface 1231 and the second side surface 1232 are respectively provided with a groove, one side of the sliding block 130 close to the fishing rod 110 is provided with a sliding claw 1322, and the sliding claw 1322 slides in the groove during the up-and-down movement of the sliding block relative to the sliding rail 120. Specifically, the sliding block 130 includes a ground contact surface 131 abutting against the hole wall of the inner hole 310 and a connecting portion 132 slidably connected to the sliding rail 120, the connecting portion 132 includes an extending plate 1231 extending from the inner side of the sliding block 130 toward the direction close to the sliding rail 120 and a sliding claw 1322 extending from the end of the extending plate 1231 toward the groove, the sliding claw 1322 is adapted to the shape of the groove and slides in the groove, and the sliding block 130 is slidably clamped on the sliding rail 120 by sliding the corresponding sliding claw 1322 into the groove on both sides of the sliding rail. Further, in order to ensure the smoothness of the sliding of the slider 130 relative to the slide rail 120 and the stability of the abutting surface against the inner hole wall, the connecting portion 132 of the slider is attached to the contact surface of the slide rail, and the abutting surface 131 of the slider is attached to the inner hole wall.

Further, the bottom of the sliding block 130 is provided with a guide surface 133, and the sliding block 130 can smoothly slide into the drill rod 300 through the guide surface 133. Specifically, referring to fig. 4, an inclined guide surface 133 is provided at the junction between the bottom surface of the slider and the outer side surface of the slider, and the angle between the guide surface 133 and the extending direction of the outer side surface of the slider is selected to be in the range of 0 to 90 °, preferably 30 °.

In the process of using the cast-in-place pile full-hydraulic drilling hole internal-expansion fisher 10 to salvage the drill bit 400, firstly, an external driving device lowers the salvage body 100 to the position near the dropped drill bit through the connecting body 200, and when the salvage body 100 is lowered continuously, the guide head 143 below the drill cylinder enters the interior of the drill rod 300 firstly, and then the salvage rod 110 is guided to be aligned with the drill rod 300 and enter the interior of the drill rod 300; then, when the fishing body 100 is further lowered into the inner hole 310, the guide surface 133 of the sliding block 130 sliding down to the lower end 122 of the sliding rail under the action of gravity first contacts the upper end surface of the drill rod, the upper end surface of the drill rod prevents the sliding block 130 from sliding down until the sliding block 130 slides up relative to the sliding rail 120 until the outer side surface of the sliding block is positioned in the inner hole 310, and the sliding block 130 slides into the drill rod 300 along with the sliding rail 120; then, in order to enable the sliding block 130 to firmly abut against the wall of the inner hole 310 of the drill rod, after the sliding block 130 is lowered into the drill rod along with the sliding rail and extends into the inner hole 310 for a certain distance, the external driving device pulls the fishing body 100 upwards through the connecting body 200, the sliding block 130 is kept still relative to the inner wall of the inner hole 310 under the friction action with the inner wall of the inner hole 310, the sliding rail 120 fixed on the outer side of the fishing rod 110 moves upwards relative to the sliding block 130 and generates an extrusion acting force vertical to the inner side surface of the sliding block 130, and then the sliding block 130 is tightly pressed on the drill rod 300; finally, the external driving device pulls the fishing body 100 carrying the drill bit 400 upwards, thereby completing the fishing of the drill bit 400.

In one embodiment, the fishing body 100 is fixedly attached to the connecting body 200 or removably attached to the connecting body 200. Specifically, the fishing body 100 is fixedly connected to the connecting body 200 by welding or the like, or the fishing body 100 is detachably connected to the connecting body 200 by bolts, screws or the like. Preferably, in order to ensure the stability and safety of the connection of the connecting body 200 pulling the fishing body 100 upwards by the external driving device, the connecting body 100 is a cylindrical flange 210, and the fishing body 100 is fixedly connected to the cylindrical flange 210, i.e. the fishing rod 110 and the fishing barrel 140 are fixedly connected to the cylindrical flange 210. Further, when carrying the fishing rod 110 of drill bit 400 because external drive arrangement upwards stimulates through connecting body 200, connecting body 200 bears the weight of salvaging body 100 and the drill bit 400 that drops, for avoiding connecting body 200 and the fracture of the junction of salvaging body 100, be equipped with strengthening rib 220 between cylinder flange 210 and the overshot 140, its strengthening rib 220 circumference distributes between cylinder flange 210 and overshot 140, through strengthening rib 220 in order to improve the connecting strength between connecting body 200 and the salvaging body 100.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. An internal expanding fisher for dropping a round drill rod in a full-hydraulic drilling hole of a cast-in-place pile, which is used for fishing a drill bit, is characterized by comprising

The fishing body comprises a fishing rod, a plurality of convex strips which are distributed at intervals on the periphery of the fishing rod and extend along the axial direction of the fishing rod, a slide rail arranged on the side part of the convex strips and a slide block movably connected to the slide rail, wherein the slide rail extends along the length direction of the convex strips and is obliquely arranged outwards deviating from the fishing rod, the slide block is provided with a pressing surface arranged outwards, the pressing surfaces of the slide blocks surround to form a peripheral surface which is in contact with a drill bit, and the diameter of the peripheral surface of the slide block is correspondingly reduced or enlarged when the slide block moves upwards or downwards along the slide rail; and

and one side of the connecting body is connected with an external driving device, and the other side of the connecting body is connected with the fishing body.

2. The internal expanding type fisher for the round drill rod capable of dropping the drill in the full-hydraulic drill hole of the cast-in-place pile according to claim 1 is characterized in that an overshot is arranged around the outside of the overshot rod, an avoiding groove is formed in the wall of the overshot, the avoiding groove is arranged along the axial extension of the overshot rod, the sliding block penetrates through the avoiding groove, and the abutting surface of the sliding block is exposed outside the overshot.

3. The full-hydraulic in-hole-dropping circular drill rod internal expansion type fisher according to claim 2, further comprising a limiting body, wherein the limiting body is positioned at the end part of the slide rail to prevent the slide block from being separated from the slide rail.

4. The internal expanding overshot for a round drill rod capable of dropping in a full-hydraulic drilled hole of a cast-in-place pile according to claim 3, characterized in that the limiting body is positioned at the upper end part of the slide rail, the lower end part of the slide rail is positioned in an overshot, the limiting body prevents the slide block from sliding upwards, and the bottom of the avoiding groove prevents the slide block from sliding downwards; or alternatively

The limiting body is positioned at the lower end part of the sliding rail, the upper end part of the sliding rail is positioned in the overshot, the limiting body prevents the sliding block from sliding downwards, and the top of the avoidance groove prevents the sliding block from sliding upwards; or

The limiting bodies are located at two ends of the sliding rail and prevent the sliding block from sliding upwards or downwards.

5. The fully-hydraulic cast-in-place pile internal-expansion fisher for dropping a circular drill rod in a drilled hole according to claim 2, wherein the fishing body is provided with a guide head, the guide head is arranged at the lower end of the fishing barrel, and the guide head axially extends along the fishing barrel and simultaneously radially inwardly contracts.

6. The fully hydraulic cast-in-place pile internal expansion type fisher for dropping the round drill rod in the drilled hole according to any one of claims 2-3, wherein the raised strip comprises a first side surface and an oppositely arranged second side surface, and the slide rails are positioned on the first side surface and the second side surface of the raised strip.

7. The internal expansion type fisher for dropping the round drill rod in the full-hydraulic drilled hole of the cast-in-place pile according to claim 6, wherein the slide rail is a protrusion or a groove arranged on the first side surface and/or the second side surface.

8. The internal expanding type fisher for the round drill rod of the cast-in-place pile through full hydraulic drilling according to claim 6, wherein the lower end of the sliding block is provided with a guide surface, and the guide surface extends from the bottom surface of the sliding block to the outer side surface of the sliding block from the obliquely upper direction.

9. The bored pile full-hydraulic in-hole drop-drilling round drill rod internal expansion type fisher according to any one of claims 2-4, wherein the connecting body is a cylindrical flange, and the fisher body is fixedly connected to the cylindrical flange; or

The salvaging body is detachably connected with the cylindrical flange.

10. The internal expanding type fisher for dropping the round drill rod in the full hydraulic drilling hole of the cast-in-place pile according to claim 9, wherein a reinforcing rib is arranged between the cylindrical flange and the fishing barrel.

Images