A protective cover for recovering an anchor rod external unloading device and a construction method thereof

Abstract

The present invention relates to a protective cover for an external unloading device for recovering an anchor rod, comprising a cover wall, a cover ear, a wall groove and a cover bottom, wherein the cover wall is a circular steel cylinder, a sealed cover bottom is arranged on the top of the cover wall, an open cover groove is symmetrically arranged on the bottom of the cover wall, and cover ears are symmetrically arranged on the cover wall directly above the cover groove, and threading holes are arranged in the cover ears, and the protective cover can be fixed to the external unloading device for recovering an anchor rod through a screw, a fixing nut and a nut, so as to complete the installation and unloading unlocking of the protective cover. The device of the present invention ensures the personal safety of the unloading personnel, is easy to use, has a simple structure, a low manufacturing cost and strong practicality.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a protective cover for recovering an anchor rod external unloading device and a construction method thereof. Background Art

[0002] Building foundation pit support is a measure of support, reinforcement and protection for the side walls of the foundation pit and the surrounding environment in order to ensure the safety of underground structure construction and the surrounding environment of the foundation pit. In recent years, more and more detachable recovery anchor rods or anchor rods have been used. For example, in CN 105544535 B, a Chinese invention patent application entitled "Recovery anchor cable external unloading device" discloses a recovery anchor cable external unloading device, including a bottom plate, an inner cone split part, an outer cone sleeve, a clip and a screw. The inner cone split part is matched with the outer cone sleeve on the outside, and the outer cone sleeve is locked to the bottom plate by at least two screw assemblies on the circumference, and the anchor cable is locked by the inner cone split part and the clip. The inner cone split part is provided with at least four conical through holes along the axial direction, and each conical through hole is provided with a set of clips and a screw. The clamping holes are formed to pass through the anchor cables, and each anchor cable extends into the rock and soil through the bottom plate. When unloading, the screw assembly is loosened, and the outer cone sleeve is lifted outward to separate the inner cone split parts, so that each group of clips is separated and loses the clamping force to complete the unloading of the anchor cable tension; the inner cone split parts are cut along the conical through hole to form left, middle and right splits, and the left, middle and right splits constrain each group of clips with the cooperation of the outer cone sleeve. Each group of clips is composed of two clips, the outer sides of the two clips are conical, and the inner sides of the two clips are provided with friction teeth. The screw assembly includes a screw and a matching nut. One end of the screw is fixed on the bottom plate, and the other end passes through the outer cone sleeve and is locked by the nut. Two ear seats are symmetrically arranged on the circumference of the outer cone sleeve. The ear seats have through holes for the screw to pass through, and a spring pad is arranged below the nut on the screw.

[0003] During disassembly, the above patent loosens the screw assembly, and the outer cone sleeve pushes outward to separate the inner cone split part, so that the clip is separated from the anchor cable, thereby unloading the anchor cable tension. However, during the disassembly process, the anchor rod will generate a large rebound force, and the clip will fly out at high speed, causing equipment damage or casualties.

[0004] In view of this, the present invention designs a protective cover for recovering an external unloading device of an anchor rod to solve the above-mentioned problem. Summary of the invention

[0005] The present invention aims at the potential safety hazards in the process of disassembling recoverable anchor rods, and its purpose is to provide a protective cover for an external unloading device of a recoverable anchor rod which has a simple structure, is easy to install and disassemble, and is safe and reliable. Another purpose of the present invention is to propose a construction method of the protective cover.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A protective cover for recovering an anchor rod external unloading device, comprising a cover wall, cover ears, wall grooves and a cover bottom, wherein the cover wall is cylindrical, a cover bottom is provided at one end of the cover wall along the axial direction, and cover grooves are symmetrically provided at the other end of the cover wall along the axial direction, the cover grooves extend from the inner wall of the cover wall to the outer wall, and cover ears are symmetrically provided on the outer wall of the cover wall, the cover ears are provided directly above the cover grooves, and threading holes are provided in the cover ears for cooperating with the screw of the anchor rod external unloading device for recovering the anchor rod.

[0008] As a preferred embodiment of the present invention, the external unloading device for recovering the anchor rod comprises a base plate, an inner cone split part, an outer cone sleeve, a clip and the screw rod, the inner cone split part is arranged in the outer cone sleeve, the outer cone sleeve is locked to the base plate by the two screw rods on the circumference, and the anchor rod is locked by the inner cone split part and the clip rod, the inner cone split part is axially provided with a conical through hole, the conical through hole is provided with a group of clips and forms a clamping hole for clamping the anchor rod, the inner cone split part is cut along the conical through hole to form an inner cone left split part, an inner cone middle split part and an inner cone right split part, the inner cone left split part, the inner cone middle split part and the inner cone right split part constrain each group of clips with the cooperation of the outer cone sleeve, the outer cone sleeve is symmetrically provided with two ear seats on the circumference, the ear seats are provided with through holes for the screw rod to pass through, the screw rod is provided with nuts, and the nuts are pressed against the ear seats.

[0009] As a preferred embodiment of the present invention, the inner diameter of the cover wall is 6 to 20 mm larger than the outer diameter of the outer cone sleeve, and the outer diameter of the cover wall is 40 to 100 mm smaller than the distance between the two screws.

[0010] As a preferred embodiment of the present invention, the width of the cover groove gradually increases from the inner wall to the outer wall of the cover wall, and the minimum width of the cover groove is 6 to 20 mm greater than the width of the ear seat.

[0011] As a preferred embodiment of the present invention, the height of the cover groove is 2 to 10 mm smaller than the height of the outer cone sleeve.

[0012] As a preferred embodiment of the present invention, the distance from the top surface of the cover ear to the bottom of the cover wall is 40-60 mm less than the height of the screw; the distance from the bottom surface of the cover ear to the top surface of the nut is 50-150 mm.

[0013] As a preferred embodiment of the present invention, the inner diameter of the threading hole is 4 to 10 mm larger than the outer diameter of the screw.

[0014] As a preferred embodiment of the present invention, the length of the cover wall along the axial direction is 200-500 mm.

[0015] A construction method for recovering a protective cover of an anchor rod external unloading device comprises the following steps:

[0016] (1) Preparation: Clear the debris on the screw of the unloading device for the reclaimed anchor to be removed, and check whether the length of the anchor exposed outside the outer cone sleeve is less than the length of the cover wall. If it is greater than the length of the cover wall, cut off part of the exposed anchor so that the remaining exposed anchor can be accommodated in the cover wall;

[0017] (2) Installation of the protective cover: Align the cover groove of the protective cover with the ear seat, align the threading hole of the cover ear with the screw, put it on the external unloading device of the recovery anchor, press the protective cover against the bottom plate, and then temporarily fix the protective cover on the screw with a fixing nut;

[0018] (3) Unlocking the external unloading device of the recovery anchor rod: unscrew the two nuts on the screw rod until they touch the ears of the protective cover, loosen the outer cone sleeve with a tool, and slowly lift the outer cone sleeve upward to the position of the unscrewed nuts; at this time, since the outer cone sleeve is separated from the inner cone split part after being lifted up, the inner cone left split part, the inner cone middle split part, and the inner cone right split part are loosened outward and separated from each other, and the external unloading device of the recovery anchor rod is unlocked;

[0019] (4) Removal of protective cover: Unscrew the fixing nut on the screw and remove the protective cover to complete the removal of the protective cover;

[0020] (5) Removal of the external unloading device of the recovery anchor: unscrew the nut on the screw rod, remove the outer cone sleeve, remove the left split part of the inner cone, the middle split part of the inner cone, the right split part of the inner cone, and the clip to complete the removal of the external unloading device of the recovery anchor; remove the recovery anchor.

[0021] The protective cover for the external unloading device for recovering anchor rods provided by the present invention can be fixed to the external unloading device for recovering anchor rods by means of screw rods, fixing nuts and nuts to complete the installation of the protective cover. When unloading and unlocking, the nut on the external unloading device for recovering anchor rods is loosened first. At this time, the protective cover is still locked on the screw rod. The outer cone sleeve is lifted to loosen the inner cone split part and the clip to complete the unlocking of the anchor rod. At this time, even if the clip flies, it can be effectively protected by the protective cover to ensure the personal safety of the unloading personnel. The present invention is easy to use, simple in structure, low in manufacturing cost and strong in practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a cross-sectional view of a protective cover of an external unloading device for recovering an anchor rod in an installed and used state.

[0023] Figure 2 The present invention is a cross-sectional view of a protective cover for recovering an external unloading device for an anchor rod.

[0024] Figure 3 For the present invention Figure 2 Top view of the .

[0025] Figure 4 For the present invention Figure 2 Bottom view of .

[0026] Figure 5 For the present invention Figure 2 Front view of .

[0027] Figure 6 For the present invention Figure 2 Left view of .

[0028] Figure 7 For the present invention Figure 2 AA cross-section diagram.

[0029] Figure 8 For the present invention Figure 2 BB cross-section diagram.

[0030] Fig. 9 For the present invention Figure 2 CC cross-section diagram.

[0031] Fig.10 For the present invention Figure 2 DD cross-section diagram.

[0032] In the figure:

[0033] 100 protective cover 110 cover wall 120 cover ear 130 threading hole 140 wall groove 150 cover bottom 160 accommodating cavity 170 fixing nut

[0034] 200 Recover anchor rod external unloading device 210 Bottom plate 220 Inner cone split part

[0035] 221 inner cone left split part 222 inner cone middle split part 223 inner cone right split part 230 outer cone sleeve 231 ear seat 232 through hole 240 clip 250 spring washer 260 nut 270 screw

[0036] 300 retaining structure 310 anchor rod 320 concrete beam 330 soil 340 mortar DETAILED DESCRIPTION

[0037] In order to further explain the technical solution of the present invention, it is described in detail below in conjunction with an embodiment, and the state after the protective cover is installed is used for directional description.

[0038] See also Figures 1 to 10 A protective cover for recovering an anchor rod external unloading device comprises a cover wall 110, a cover ear 120, a wall groove 140 and a cover bottom 150.

[0039] The protective cover provided in the present invention is used in conjunction with the external unloading device 200 for recovering the anchor rod. The structure of the external unloading device 200 for recovering the anchor rod is recorded in CN 105544535 B. Its main structure includes a bottom plate 210, an inner cone split part 220, an outer cone sleeve 230, a clip 240 and the screw 370. The screw 370 is connected to the bottom plate 210. The inner cone split part 220 is arranged in the outer cone sleeve 230. The outer cone sleeve 230 is locked on the bottom plate 210 by two screws 270 on the circumference and the anchor rod is locked by the inner cone split part 230 and the clip 240. The inner cone split part 230 is provided with a conical through hole along the axial direction. A group of clips 240 are arranged in the conical through hole to form a clamping hole for clamping the anchor rod. The inner cone split part 230 is provided with a conical through hole along the axial direction. The hole cutting forms the inner cone left split part 221, the inner cone middle split part 222 and the inner cone right split part 223. The inner cone left split part 221, the inner cone middle split part 222 and the inner cone right split part 223 constrain each group of clips 240 with the cooperation of the outer cone sleeve 230. The outer cone sleeve 220 is symmetrically provided with two ear seats 231 on the circumference. The ear seats 231 are provided with through holes 232 for the screw rod 270 to pass through. The screw rod 270 is equipped with a nut 260, which is pressed against the ear seat 231. A gasket 250 is provided between the nut 260 and the ear seat 231.

[0040] The cover wall 110 is a circular steel cylinder, and a receiving cavity 160 for receiving the anchor rod 310 is formed inside the cover wall 110. A sealed cover bottom 150 is arranged on the top of the cover wall 110, and open cover grooves 140 are symmetrically arranged on the bottom of the cover wall 110. The cover grooves 140 extend from the inner wall to the outer wall of the cover wall 110. There are two cover grooves 140. The outer wall of the cover wall 110 is provided with cover ears 120 extending outward. There are two cover ears 120, which are symmetrically arranged on both sides of the circumference of the cover groove 140. Each cover ear 120 is correspondingly arranged directly above the cover groove 140, and a threading hole 130 is arranged in the cover ear 120.

[0041] Preferably, the inner diameter of the cover wall 110 is 6 to 20 mm larger than the outer diameter of the outer cone sleeve 230 of the recovery anchor rod external unloading device 200, and the outer diameter of the cover wall 110 is 40 to 100 mm smaller than the distance between the two screws 270, so that the protective cover 100 can cover the outer cone sleeve 230 and can move up and down well and the nut 260 on the ear seat 231 can have enough screwing space.

[0042] Preferably, the width of the cover groove 140 gradually increases from the inner wall to the outer wall of the cover wall 110, and the minimum width of the cover groove 140 is 6 to 20 mm larger than the width of the ear seat 231 of the recovery anchor rod external unloading device 200, and the height of the cover groove 140 is 6 to 10 mm larger than the height of the ear seat 231 of the recovery anchor rod external unloading device 200 and is 2 to 10 mm smaller than the height of the outer cone sleeve 230 of the recovery anchor rod external unloading device 200, so that the cover groove 140 can cover the ear seat 231 and prevent the ejected clip 240 and anchor rod 310 from flying out of the protective cover 100 and causing personal injury.

[0043] Preferably, the distance from the top surface of the cover ear 120 to the bottom of the cover wall 110 is 40 to 60 mm less than the height of the screw 270 of the recovery anchor rod external unloading device 200; the distance from the bottom surface of the cover ear 120 to the top surface of the nut 260 is 50 to 150 mm, so that the nut 260 on the ear seat 231 has enough space to screw, preventing the nut 260 from preventing the outer cone sleeve 230 from being lifted up due to the nut 260 rising height being too short, thereby making it impossible for the inner cone split part 220 to be split.

[0044] Preferably, the screw 270 of the anchor rod recovery external unloading device 200 matches the threading hole 130 of the cover ear 120, the fixing nut 170 and the nut 260, and the inner diameter of the threading hole 130 is 4 to 10 mm larger than the outer diameter of the screw.

[0045] Preferably, the axial length of the cover wall 110 is 200-500 mm, so that the anchor rod 310 has a certain expansion space after unloading, and does not press against the top of the protective cover 100 and cannot be unloaded.

[0046] The present invention also proposes a construction method for recovering a protective cover of an anchor rod external unloading device, and the construction steps are as follows:

[0047] (1) Preparation: remove cement slurry or concrete and other debris on the screw rod 270 of the anchor rod external unloading device 200 to be removed and recovered, and check whether the length of the anchor rod 310 exposed outside the outer cone sleeve 230 is less than the length of the cover wall 110. If it is greater than the length of the cover wall 110, cut off part of the exposed anchor rod 310 so that the remaining exposed anchor rod 310 can be accommodated in the cover wall 110;

[0048] (2) Installation of the protective cover 100: After aligning the cover groove 110 of the protective cover 100 with the ear seat 231 and the threading hole 130 of the cover ear 120 with the screw 270, put it on the external unloading device 200 for recovering the anchor rod, and press the protective cover 100 against the bottom plate 210, and then temporarily fix the protective cover 100 on the screw 270 with the fixing nut 170;

[0049] (3) Unlocking the external unloading device 200 of the recovered anchor rod: unscrew the two nuts 260 on the screw rod 270 until they touch the cover ears 120 of the protective cover 100, loosen the outer cone sleeve 230 with a tool, and then slowly lift the outer cone sleeve 230 upward to the position of the unscrewed nuts 260; at this time, since the outer cone sleeve 230 is separated from the inner cone split part 220 after being lifted up, the inner cone left split part 221, the inner cone middle split part 222, and the inner cone right split part 223 are loosened outward and separated from each other, and the external unloading device 200 of the recovered anchor rod is unlocked;

[0050] (4) Removal of the protective cover 100: Unscrew the fixing nut 170 on the screw rod 270, remove the protective cover 100, and complete the removal of the protective cover 100;

[0051] (5) Removal of the external unloading device 200 for the recovery anchor: unscrew the nut 260 on the screw rod 270, remove the outer cone sleeve 230, remove the inner cone left split part 221, the inner cone middle split part 222, the inner cone right split part 223, and the clip 240, and complete the removal of the external unloading device 200 for the recovery anchor; the recovery anchor 310 can be removed in succession.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A protective cover for recovering an external unloading device for an anchor bolt, characterized in that: The cover wall comprises a cover wall, a cover ear, a wall groove and a cover bottom, wherein the cover wall is cylindrical, a cover bottom is arranged at one end of the cover wall along the axial direction, a cover groove is symmetrically arranged at the other end of the cover wall along the axial direction, the cover groove runs through the inner wall of the cover wall to the outer wall, the outer wall of the cover wall is symmetrically provided with cover ears, the cover ears are arranged just above the cover grooves, and a threading hole is arranged in the cover ears to cooperate with the screw of the external unloading device for recovering the anchor rod; The external unloading device for recovering anchor rod comprises a bottom plate, an inner cone split part, an outer cone sleeve, a clip and the screw rod, the inner cone split part is arranged in the outer cone sleeve, the outer cone sleeve peripheral side is locked on the bottom plate by two screw rods, and the anchor rod is locked by the inner cone split part and the clip rod together, the inner cone split part is provided with a conical through hole along the axial direction, the conical through hole is provided with a group of clips and forms a clamping hole for clamping the anchor rod, the inner cone split part is cut along the conical through hole to form an inner cone left split part, an inner cone middle split part and an inner cone right split part, the inner cone left split part, the inner cone middle split part and the inner cone right split part constrain each group of clips under the cooperation of the outer cone sleeve, the outer cone sleeve peripheral side is symmetrically provided with two ear seats, the ear seats are provided with through holes for the screw rod to pass through, the screw rod is provided with a nut, and the nut is pressed against the ear seat; The width of the cover groove gradually increases from the inner wall to the outer wall of the cover wall, and the minimum width of the cover groove is 6 to 20 mm greater than the width of the ear seat.

2. A protective cover for recovering an external unloading device for an anchor rod as claimed in claim 1, characterized in that: The height of the cover groove is 2 to 10 mm smaller than the height of the outer cone sleeve.

3. A protective cover for recovering an external unloading device for an anchor rod as claimed in claim 2, characterized in that: The distance from the top surface of the cover ear to the bottom of the cover wall is 40 to 60 mm less than the height of the screw; the distance from the bottom surface of the cover ear to the top surface of the nut is 50 to 150 mm.

4. A protective cover for recovering an external unloading device for an anchor rod as claimed in claim 3, characterized in that: The inner diameter of the threading hole is 4 to 10 mm larger than the outer diameter of the screw.

5. A protective cover for recovering an external unloading device for an anchor rod as claimed in claim 4, characterized in that: The axial length of the cover wall is 200-500 mm.

6. A construction method for recovering a protective cover of an external unloading device for an anchor rod as claimed in claim 5, characterized in that: The steps include: (1) Preparation: Clear the debris on the screw of the external unloading device of the anchor to be removed, and check whether the length of the anchor exposed outside the outer cone sleeve is less than the length of the cover wall. If it is greater than the length of the cover wall, cut off part of the exposed anchor so that the remaining exposed anchor can be accommodated in the cover wall; (2) Installation of the protective cover: Align the cover groove of the protective cover with the ear seat, align the threading hole of the cover ear with the screw, put it on the external unloading device of the recovery anchor, press the protective cover against the bottom plate, and then temporarily fix the protective cover on the screw with a fixing nut; (3) Unlock the external unloading device of the reclaimed anchor rod: unscrew the two nuts on the screw rod until they touch the ears of the protective cover, loosen the outer cone sleeve with a tool, and then slowly lift the outer cone sleeve upward to the position of the unscrewed nuts; At this time, since the outer cone sleeve is lifted up and separated from the inner cone split part, the inner cone left split part, the inner cone middle split part, and the inner cone right split part are loosened outward and separated from each other, and the external unloading device of the recovery anchor bolt is unlocked; (4) Removal of the protective cover: Unscrew the fixing nut on the screw and remove the protective cover to complete the removal of the protective cover; (5) Removal of the external unloading device of the recovery anchor: unscrew the nut on the screw, remove the outer cone sleeve, remove the left split part of the inner cone, the middle split part of the inner cone, the right split part of the inner cone, and the clip, and complete the removal of the external unloading device of the recovery anchor; Remove and recover the anchor rod.

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