Overlying strata separation layer grouting settlement-reducing grouting drill rod

Abstract

The utility model provides an overlying strata separation layer grouting subsidence-reducing grouting drill rod which comprises a main drill rod, a connecting pipe and an extending drill rod, the bottom of the connecting pipe is connected with the top of the extending drill rod in a screwed mode, and a moving space is arranged in the connecting pipe. One end of the main drill rod is arranged in the connecting pipe in a sleeved mode and is detachably connected with the position, close to the bottom, of the movable space in a screwed mode. According to the utility model, the buffer spring is arranged in the movable space, then the baffle ring is fixedly sleeved on the main drill rod, the limiting ring is arranged at the opening part of the connecting pipe, and the buffer spring is positioned between the limiting ring and the baffle ring paper, so that when the main drill rod and the connecting pipe are unscrewed, the extension drill rod can freely move due to the arrangement of the movable space; and during movement, due to the buffering effect of the buffering spring, the impact force between the extending drill rod and the main drill rod is greatly reduced, the main drill rod and the connecting pipe cannot be damaged, and compared with the prior art, the service life of the drill rod is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of overburden separation layer grouting subsidence reduction, and in particular to an overburden separation layer grouting subsidence reduction grouting drill rod. BACKGROUND

[0002] At present, when grouting the overburden separation layer, the grouting drill rod is lowered into the grouting borehole to the grouting layer for grouting. However, with the advancement of the underground mining face, the overburden movement intensifies, causing the rock stratum to displace. With the movement of the rock stratum, the grouting drill rod in the grouting borehole also displaces, which in turn causes the grouting drill rod to break off, making it impossible to grout the overburden separation layer.

[0003] The utility model with publication number CN218759815U proposes an overburden separation layer grouting subsidence reduction anti-break-off grouting drill rod, which comprises a main drill rod connected to an external drilling machine and an extension drill rod inserted into the bottom of the grouting borehole. A connecting pipe is arranged between the main drill rod and the extension drill rod. The bottom end of the connecting pipe is fixedly connected to the top end of the extension drill rod. The top end of the connecting pipe is connectable to and separable from the bottom end of the main drill rod. When the main drill rod is separated from the connecting pipe, the bottom end of the main drill rod is located in the connecting pipe and forms a movable gap with the inner side wall of the connecting pipe. In the utility model, the grouting drill rod is prevented from breaking off due to the movement of the rock stratum during the overburden separation layer grouting process, ensuring smooth grouting.

[0004] The above-mentioned prior art still has the following deficiencies when in use: the extension drill rod moves in the movable space reserved in the connecting pipe as the rock stratum moves, which prevents the grouting drill rod from breaking off. However, the movable space does not have a buffer structure, so that the extension drill rod will generate a large impact force on the main drill rod when moving the connecting pipe, which not only generates a large noise but also easily damages the limiting components on the main drill rod and the connecting pipe.

[0005] Therefore, the utility model provides an overburden separation layer grouting subsidence reduction grouting drill rod. UTILITY MODEL CONTENTS

[0006] In view of the deficiencies of the prior art, the utility model aims to provide an overburden separation layer grouting subsidence reduction grouting drill rod to solve the problems raised in the background art. The utility model has the function of buffering the movement of the extension drill rod, greatly reducing the impact force between the extension drill rod and the main drill rod, and enabling the grouting to operate reliably.

[0007] In order to achieve the above object, the utility model is through the following technical scheme to realize: a kind of overburden separation grouting subsidence grouting drill rod, including main drill rod, connecting pipe and extension drill rod, the bottom of connecting pipe and the top of extension drill rod are screwed connection, setting up movable space in connecting pipe, one end of main drill rod is set in connecting pipe and is screwed detachable connection with the position close to the bottom of movable space, fixed sleeve ring that is close to bottom and is detachable is set on main drill rod, the top of connecting pipe is detachably connected with limiting ring, buffer spring is set on main drill rod between sleeve ring and limiting ring.

[0008] Further, the inner circumferential wall of the connecting pipe is provided with at least two insertion holes which are uniformly distributed in the circumferential direction and close to the top, and the limiting ring is detachably connected to the top of the connecting pipe and has an outer circumferential wall provided with a bayonet catch connected with the insertion holes.

[0009] Further, the outer circumferential wall of the limiting ring is provided with a positioning hole, one end of the bayonet catch is sleeved in the positioning hole and is slidingly connected, and a tension spring is sleeved in the positioning hole, one end of the tension spring abuts against one end of the bayonet catch.

[0010] Further, the upper end surface of the limiting ring is welded with two vertical rods located on both sides of the axis of the limiting ring, and the top of the two vertical rods is welded and connected by an arc-shaped bending rod.

[0011] Further, the lower end surface of the limiting ring is provided with circumferentially uniformly distributed rollers, and the top of the buffer spring is welded with a grommet which is detachably sleeved outside the main drill rod and abuts against the rollers at the top.

[0012] Further, the sleeve ring is composed of two semicircular rings, the two semicircular rings are connected by insertion, and both are fixedly connected to the main drill rod by bolts.

[0013] Further, one end of the semicircular ring is provided with a bayonet hole, and the other end is provided with a plug matched with the bayonet hole, the middle of the outer arc wall of the semicircular ring is provided with a connecting hole, and the outer circumferential wall of the main drill rod is provided with a threaded hole opposite to the connecting hole.

[0014] The utility model has the following beneficial effects:

[0015] 1. In the utility model, by setting buffer spring in movable space, then fixed sleeve ring that is close to bottom is set on main drill rod, limiting ring is set in the mouth of connecting pipe, buffer spring is located between limiting ring and sleeve ring, when main drill rod and connecting pipe are screwed open, because the setting of movable space makes that extension drill rod can freely move, and because the buffering effect of buffer spring when moving, the impact force between extension drill rod and main drill rod is greatly reduced, main drill rod and connecting pipe are not damaged, and the service life of the drill rod is prolonged compared with the prior art.

[0016] 2、In the utility model, the limiting ring and the connecting pipe are connected in the way of clamping, have the function of splitting, this kind of setting facilitates the installation and separation of the main drill rod and the connecting pipe, the detachable connection of the retaining ring and the main drill rod makes the installation and dismounting of the buffer spring more convenient, this kind of setting makes the difficulty of the manufacture of the drill rod greatly reduce. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structure schematic view of the utility model of overburden strata separation grouting subsidence reduction grouting drill rod;

[0018] Figure 2 It is Figure 1 It is the schematic view of the connecting pipe and the main drill rod after explosion development;

[0019] Figure 3 It is Figure 2 It is the schematic view of the snap pin, limiting ring and retaining ring after explosion development.

[0020] In the drawing: 1, main drill rod;2, connecting pipe;21, activity space;22, jack;3, retaining ring;31, semicircle ring;311, clamping hole;312, plug;4, limiting ring;41, positioning hole;42, roller;43, vertical rod;431, arc-shaped bent rod;5, buffer spring;51, grommet;6, snap pin;7, supporting spring;8, extension drill rod. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, purposes and effects realized by the utility model easy to understand, the utility model is further described below in combination with specific implementation manners.

[0022] Please refer to Figures 1 to 3 The utility model provides a technical scheme: a kind of overburden strata separation grouting subsidence reduction grouting drill rod, including main drill rod 1, connecting pipe 2 and extension drill rod 8, the bottom of connecting pipe 2 and the top of extension drill rod 8 are screwed connection, connecting pipe 2 is provided with activity space 21, this activity space 21 is wrong breaking space, one end of main drill rod 1 is set in connecting pipe 2 and and activity space 21 is close to the position of bottom screwing detachable connection, wherein the structure that connecting pipe 2 and main drill rod 1 and extension drill rod 8 are screwed connection can use the structure in the patent literature mentioned in background art, this application will not be described in detail.

[0023] In the technical solution, the stop ring 3 is fixedly sleeved on the main drill rod 1 and is close to the bottom and detachable. The stop ring 3 is located in the movable space 21, the top of the connecting pipe 2 is detachably connected with the limiting ring 4, the main drill rod 1 is sleeved with the buffer spring 5 between the stop ring 3 and the limiting ring 4, and the main drill rod 1 and the connecting pipe 2 can freely move in the movable space 21 after the threaded rotation is opened, in other words, the extension drill rod 8 can drive the connecting pipe 2 to move relative to the main drill rod 1, and the purpose is to prevent breakage. The buffer spring 5 is arranged, so that the impact force of the extension drill rod 8 on the main drill rod 1 during movement can be buffered by the buffer spring 5, and damage to the connecting pipe 2 and the main drill rod 1 caused by the impact can be avoided.

[0024] In the embodiment, at least two insertion holes 22 are formed in the inner circumferential wall of the connecting pipe 2 and are uniformly distributed in the circumferential direction and close to the top, the limiting ring 4 is gap-sleeved on the top of the connecting pipe 2 and the outer circumferential wall of the limiting ring 4 is provided with a bayonet 6 that is connected with the insertion hole 22, and preferably, a positioning hole 41 is formed in the outer circumferential wall of the limiting ring 4, one end of the bayonet 6 is sleeved in the positioning hole 41 and is slidingly connected, and a supporting spring 7 is sleeved in the positioning hole 41, one end of the supporting spring 7 abuts against one end of the bayonet 6. When the limiting ring 4 needs to be detached, a plug pin can be inserted into the insertion hole 22 from the outside and press the bayonet 6, so that the bayonet 6 is separated from the insertion hole 22, and then the limiting ring 4 can be conveniently taken off from the connecting pipe 2, and at this time, the main drill rod 1 and the connecting pipe 2 can be separated, and vice versa.

[0025] Further, two vertical rods 43 are welded on the upper end surface of the limiting ring 4 and are located on both sides of the axis of the limiting ring 4, the top of the two vertical rods 43 is welded and connected through an arc-shaped bending rod 431, the arc-shaped bending rod 431 is a hand-held part for pressing the limiting ring 4 downward, and due to the elastic pushing force of the buffer spring 5, the friction between the bayonet 6 and the positioning hole 41 is increased, and when the arc-shaped bending rod 431 is pressed downward, the bayonet 6 and the positioning hole 41 can be controlled to be in a clearance fit state, at this time, the bayonet 6 can be pressed from the outside by means of a tool, and this kind of arrangement has the advantages of saving labor and being convenient for detaching the limiting ring 4.

[0026] In the embodiment, the stop ring 3 is composed of two half rings 31, the two half rings 31 are connected by insertion, and both are fixedly connected with the main drill rod 1 through bolts, and this kind of arrangement makes the stop ring 3 more convenient to detach, and after the stop ring 3 is detached, the limiting ring 4 and the buffer spring 5 can be detached, and this kind of arrangement greatly reduces the difficulty of manufacturing the grouting drill rod with the buffering function.

[0027] Specifically, one end of the semi-circular ring 31 is provided with a clamping hole 311, and the other end is provided with a plug 312 matched with the clamping hole 311, and the middle part of the outer arc wall of the semi-circular ring 31 is provided with a connecting hole, and the outer wall of the main drill rod 1 is provided with a threaded hole matched with the connecting hole, and in use, the two semi-circular rings 31 are fixed on the main drill rod 1 by using bolts, and when the semi-circular ring 31 needs to be disassembled, only the bolts need to be disassembled.

[0028] In the embodiment, the lower end surface of the limiting ring 4 is provided with circumferentially uniformly distributed rollers 42, and the top of the buffer spring 5 is welded with a spacer ring 51 which is sleeved outside the main drill rod 1 and abuts against the rollers 42, and the main drill rod 1 can be rotated relative to the connecting pipe 2 to realize the screwing connection and the screwing separation, so as to reduce the resistance of the buffer spring 5 to the connecting pipe 2 and the main drill rod 1, and the above-mentioned rollers 42 make the buffer spring 5 not rotate when the main drill rod 1 rotates relative to the connecting pipe 2.

[0029] Working principle: in use, after the extension drill rod 8 enters the grouting position, the main drill rod 1 is rotated to make it and the connecting pipe 2 in the unscrewing state, and the inner cavities of the main drill rod 1, the connecting pipe 2 and the extension drill rod 8 are used to grout to the target position, when the grouting position is displaced, the connecting pipe 2 will be driven by the extension drill rod 8 and move relative to the main drill rod 1, at this time, the buffer spring 5 will buffer this movement to avoid excessive impact force to damage the main drill rod 1 and the connecting pipe 2.

[0030] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments which can be understood by those skilled in the art.

Claims

1. A grouting drill rod for reducing settlement during overburden delamination, comprising a main drill rod (1), a connecting pipe (2), and an extension drill rod (8), wherein the bottom of the connecting pipe (2) and the top of the extension drill rod (8) are screwed together, and an movable space (21) is provided inside the connecting pipe (2), and one end of the main drill rod (1) is sleeved inside the connecting pipe (2) and detachably connected to the movable space (21) near the bottom, characterized in that, The main drill rod (1) is fixedly sleeved with a detachable stop ring (3) close to the bottom, and the top of the connecting pipe (2) is detachably connected with a limiting ring (4), and the main drill rod (1) is sleeved with a buffer spring (5) between the stop ring (3) and the limiting ring (4).

2. The overburden separation grouting subsidence reduction grouting drill pipe according to claim 1, characterized in that: The inner circumferential wall of the connecting pipe (2) is provided with at least two insertion holes (22) which are uniformly distributed in the circumferential direction and close to the top, and the limiting ring (4) is gap-sleeved on the top of the connecting pipe (2) and is provided with a bayonet (6) on the outer circumferential wall, which is connected with the insertion hole (22).

3. The overburden separation grouting subsidence reduction grouting drill pipe according to claim 2, characterized in that: The outer circumferential wall of the limiting ring (4) is provided with a positioning hole (41), one end of the bayonet (6) is sleeved in the positioning hole (41) and is connected in sliding mode, and a supporting spring (7) is sleeved in the positioning hole (41), and one end of the supporting spring (7) abuts against one end of the bayonet (6).

4. The overburden separation grouting subsidence reduction grouting drill pipe according to claim 3, characterized in that: The upper end surface of the limiting ring (4) is welded with two vertical rods (43) located on both sides of the axis of the limiting ring (4), and the top of the two vertical rods (43) is welded and connected through an arc-shaped bending rod (431).

5. The overburden separation grouting subsidence reduction grouting drill pipe according to claim 1, characterized in that: The lower end surface of the limiting ring (4) is provided with circumferentially uniformly distributed rollers (42), and the top of the buffer spring (5) is welded with a gapped grommet (51) which is gap-sleeved on the outside of the main drill rod (1) and abuts against the rollers (42) at the top.

6. The overburden separation grouting subsidence reduction grouting drill pipe according to claim 1, characterized in that: The stop ring (3) is composed of two half rings (31), the two half rings (31) are connected in insertion mode, and both are fixedly connected with the main drill rod (1) through bolts.

7. The overburden separation grouting subsidence reduction grouting drill pipe according to claim 6, characterized in that: One end of the half ring (31) is provided with a clamping hole (311), and the other end is provided with a plug (312) matched with the clamping hole (311), and the middle of the outer arc wall of the half ring (31) is provided with a connecting hole, and the outer circumferential wall of the main drill rod (1) is provided with a threaded hole opposite to the connecting hole.

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