A prefabricated structure detachable hoisting device and method

Abstract

The application relates to a building construction hoisting device, in particular to a prefabricated structure detachable hoisting device and method, which comprises a prefabricated retaining wall body, an anchoring assembly and a safety auxiliary lifting hook, the anchoring assembly is poured into the prefabricated retaining wall body through concrete, the safety auxiliary lifting hook is used for locking and connecting the anchoring assembly, the anchoring assembly is symmetrically anchored on the left and right sides of the prefabricated retaining wall body, the anchoring assembly comprises anchoring steel bars, anchoring steel plates, rotating sleeves, protective sleeve caps and L-shaped high-strength steel bars, the upper part of the anchoring steel bars and the lower part of the L-shaped high-strength steel bars are both provided with fine thread sections, the fine thread sections of the anchoring steel bars are preassembled with reinforcing sleeves on the lower side, the anchoring steel plates are provided with two front and back insertion holes, and the anchoring steel bars are inserted and assembled in the insertion holes. The anchoring steel bars, the anchoring steel plates and the rotating sleeves in the anchoring assembly are organically combined and connected to form an internal anchoring structure of prefabricated concrete.

Description

Technical Field

[0001] This invention relates to hoisting devices for building construction, and more specifically to a detachable hoisting device and method for prefabricated structures. Background Technology

[0002] In the field of building construction, precast components have been widely adopted due to their high construction efficiency. Precast retaining walls are precast components that are frequently reused in many construction scenarios. These components can be mass-produced in factories and then transported to the construction site for direct hoisting. Typically, precast components are hoisted using anchoring structures, which generally include embedded lifting rings, steel plates, and embedded parts. However, existing anchoring structures are often difficult to dismantle directly after construction, affecting continuous construction and efficiency, and compromising hoisting safety. Therefore, there is an urgent need for a detachable hoisting device and method for precast structures to achieve rapid dismantling and safe hoisting. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a prefabricated structure detachable hoisting device and method to address the shortcomings of the prior art.

[0004] The technical problem to be solved by the present invention is achieved through the following technical solution: The present invention discloses a prefabricated detachable hoisting device, including a prefabricated retaining wall body, an anchoring assembly, and a safety auxiliary hook. The anchoring assembly is cast into the prefabricated retaining wall body with concrete. The safety auxiliary hook is used to lock and connect the anchoring assembly. The anchoring assembly is symmetrically anchored on the left and right sides of the prefabricated retaining wall body. The anchoring assembly includes anchoring bars, anchoring plates, screw-in sleeves, protective caps, and L-shaped high-strength steel bars. The upper part of the anchoring bars and the lower part of the L-shaped high-strength steel bars are provided with fine thread sections. A reinforcing sleeve is pre-installed on the lower side of the fine thread section of the anchoring bars. The anchoring steel plate has two insertion holes, one at the front and one at the back. Anchoring steel bars are inserted into the insertion holes. A swivel sleeve is screwed onto the upper side of the fine thread section of the anchoring steel bar. A protective cap is used to seal and engage with the upper end of the swivel sleeve during pouring. The lower part of the L-shaped high-strength steel bar is screwed and fixed with the swivel sleeve. The two L-shaped high-strength steel bars on the anchoring steel plate are indirectly connected by the swivel sleeve to form an inverted U-shape. The left and right ends of the safety auxiliary hook are locked to the corresponding bends and free ends of the two L-shaped high-strength steel bars. A tightening steel wire is tied to the upper middle section of the L-shaped high-strength steel bar. The anchoring assembly is connected to the lifting equipment through the safety auxiliary hook.

[0005] The technical problem to be solved by the present invention can also be further achieved by the following technical solution: the precast retaining wall body is a precast concrete component formed by concrete pouring, a hollow groove is reserved in the middle of the precast retaining wall body, a concrete edge is formed around the precast retaining wall body, and the anchoring component is anchored to the upper middle position of the concrete edge.

[0006] The technical problem to be solved by the present invention can also be further achieved by the following technical solution: the protective cap includes a through hole, the protective cap is generally shaped like a frustum, an independent plug is fixedly connected to the bottom of the protective cap, the through hole is located at the central axis of the protective cap and the independent plug, and the top of the through hole is provided with an external plug that communicates with the outside.

[0007] The technical problem to be solved by the present invention can also be further achieved by the following technical solution: the independent plug includes an upper conical connecting part and a lower piston plate. The upper outer periphery of the conical connecting part is fitted with the screw-on sleeve. A rubber cap is fitted on the outer side of the piston plate. The rubber cap includes an air hole. The protective cap is sealed by contacting the inner wall of the screw-on sleeve through the rubber cap.

[0008] The technical problem to be solved by the present invention can also be further achieved by the following technical solution: the safety auxiliary hook includes an upper hook body, a connecting block, a crossbeam, a lower cantilever hook body, and a locking block. The bottom of the upper hook body is fixedly connected to the crossbeam through the connecting block. The left front side and the right rear side of the crossbeam are both fixedly connected to a curved arm vertical beam through the connecting block. The lower end of the curved arm vertical beam is fixedly connected to the lower cantilever hook body through the connecting block. The lower end of the lower cantilever hook body is fixedly connected to a locking block. A rotating shaft is provided in the middle of the locking block. The locking block is connected to a pressure plate for rearward locking through the rotating shaft. A plug is inserted between the pressure plate and the upper hook body.

[0009] The technical problem to be solved by the present invention can also be further achieved by the following technical solution: the lower cantilever hook body is a flat hook body, the inner side of the lower cantilever hook body is provided with an arc-shaped surface for accommodating contact with the L-shaped high-strength steel bar, and the rear part of the lower cantilever hook body is provided with a turntable connector for restricting the outward sliding of the L-shaped high-strength steel bar.

[0010] The technical problem to be solved by the present invention can also be further achieved by the following technical solution: the turntable connecting body includes a disc body, an extended rotating shaft and a limiting rotating rod, the lower cantilever hook body is provided with a turntable hole, the extended rotating shaft is inserted through the turntable hole, the disc body is fixedly welded to the extended rotating shaft and keeps pressed against the side of the lower cantilever hook body, the outer end of the extended rotating shaft is welded with a limiting rotating rod, the outer periphery of the disc body is provided with a rotation limiting body, and the side of the lower cantilever hook body is provided with a pair of limiting blocks that interact with the rotation limiting body.

[0011] This invention also discloses a method for detachable hoisting of a prefabricated structure, comprising the following steps: Step S1, setting and positioning an anchoring assembly within the structural space of the prefabricated retaining wall body, wherein the reinforcing sleeve, anchoring steel plate, and screw-in sleeve in the anchoring assembly are sequentially fitted and screwed onto the anchoring steel bars from top to bottom; Step S2, inserting a protective cap onto the upper end of the screw-in sleeve to form a seal, ensuring that the top of the protective cap is higher than the preset pouring height, and then pouring concrete; Step S3, pouring concrete into the prefabricated retaining wall body. After the soil meets the required strength, remove the protective cap, screw the L-shaped high-strength steel bars into the screw-in sleeve, and bring the upper parts of the L-shaped high-strength steel bars close together; in step S4, lock the two L-shaped high-strength steel bars together with a safety auxiliary hook, and fix and tighten the upper middle section of the L-shaped high-strength steel bars with a tightening wire, and lift the precast retaining wall body structure; in step S5, remove the safety auxiliary hook from the L-shaped high-strength steel bars, then remove the L-shaped high-strength steel bars from the anchoring assembly, and backfill the conical hole and screw-in sleeve with cement grout.

[0012] The technical problem to be solved by the present invention can also be further achieved by the following technical solution: step S2 further includes the steps of keeping the outer plug opening vented during the insertion of the protective cap and sealing the outer plug opening after the insertion is completed.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] (1) The present invention forms a precast concrete internal anchoring structure by organically combining and connecting the anchoring steel bars, anchoring steel plates and swivel sleeves in the anchoring assembly, and forms a high-strength hoisting connection by connecting with the external L-shaped high-strength steel bars, which is convenient to operate.

[0015] (2) The inverted U-shaped structure formed by the combination of a pair of L-shaped high-strength steel bars in this invention can be used with a safety auxiliary hook, which improves the integrity of the L-shaped high-strength steel bars. It can limit the outward displacement of the bent part and the upturn of the free end without high-strength binding, and restrict the force point of the hook body to the force extension line of the inverted U-shaped structure near the anchoring steel bar, thus improving the force conditions.

[0016] (3) This invention solves the problem of loosening of the connection caused by mismatch in the position of the knobs of two L-shaped high-strength steel bars. Both the L-shaped high-strength steel bars and the safety auxiliary hook can be reused, which has good material turnover and low construction cost. Attached Figure Description

[0017] Figure 1 This is a front view schematic diagram of the overall structure of the device of the present invention;

[0018] Figure 2 yes Figure 1 A magnified view of a portion of position A in the middle;

[0019] Figure 3 This is a schematic diagram of the structure of the protective cap 24 of the present invention;

[0020] Figure 4 This is a schematic diagram of the side structure of the safety auxiliary hook 3 of the present invention;

[0021] Figure 5 This is a schematic diagram of the front structure of the safety auxiliary hook 3 of the present invention;

[0022] Figure 6 This is a partial side view of the anchoring component 2 of the present invention;

[0023] Figure 7 This is a partial top view of the anchoring component 2 of the present invention;

[0024] 1-Precast retaining wall body, 11-Hollow groove, 12-Concrete edge, 2-Anchoring component, 21-Anchoring steel bar, 211-Reinforcing sleeve, 22-Anchoring steel plate, 23-Screw-connecting sleeve, 24-Protective cap, 24a-Cap opening, 241-Through hole, 241a-External plug, 242-Independent plug, 243-Plug, 25-L-shaped high-strength steel bar, 3-Safety auxiliary hook, 31-Upper hook body, 32-Connecting block, 33-Horizontal beam, 34-Bent arm vertical beam, 35-Lower cantilever hook body, 351-Limiting block, 36-Turntable connector, 361-Extended rotating shaft, 362-Limiting rotating rod, 363-Rotating limiting body, 364-Disc body, 37-Locking block, 38-Pressure plate, 39-Plug, 4-Tightening wire. Detailed Implementation

[0025] like Figure 1-7 As shown, a prefabricated detachable hoisting device of the present invention includes a prefabricated retaining wall body 1, an anchoring component 2, and a safety auxiliary hook 3. The anchoring component 2 is cast into the prefabricated retaining wall body 1 by concrete pouring. The prefabricated retaining wall body 1 is a prefabricated concrete component formed by concrete pouring. A hollow groove 11 is reserved in the middle of the prefabricated retaining wall body 1, and concrete edging 12 is formed around the prefabricated retaining wall body 1. The anchoring component 2 is anchored to the upper middle position of the concrete edging 12. The safety auxiliary hook 3 is used to lock and connect the anchoring component 2. The anchoring component 2 is symmetrically anchored on the left and right sides of the prefabricated retaining wall body 1.

[0026] Specifically, the aforementioned anchoring assembly 2 includes an anchoring rebar 21, an anchoring steel plate 22, a screw-on sleeve 23, a protective cap 24, and an L-shaped high-strength rebar 25. Both the upper part of the anchoring rebar 21 and the lower part of the L-shaped high-strength rebar 25 are provided with fine thread sections. A reinforcing sleeve 211 is pre-installed on the lower side of the fine thread section of the anchoring rebar 21. The anchoring steel plate 22 has two insertion holes, one at the front and one at the back, into which the anchoring rebar 21 is inserted. A screw-on sleeve 23 is screwed onto the upper side of the fine thread section of the anchoring rebar 21. Welding can be performed near the anchoring steel plate 22 to avoid the weld point affecting the strength of the anchoring rebar 21 and improve the overall anchoring force-bearing effect. The protective cap 24 is used to seal during pouring. The protective cap 24 is fitted onto the upper end of the screw-on sleeve 23. Specifically, the protective cap 24 includes a through-hole 241. The protective cap 24 is generally truncated cone-shaped. An independent plug 242 is fixedly connected to the bottom of the protective cap 24. The through-hole 241 is located at the central axis of the protective cap 24 and the independent plug 242. The top of the through-hole 241 is provided with an external plug 241a that communicates with the outside. The independent plug 242 includes an upper conical connecting part and a lower piston plate. The upper outer periphery of the conical connecting part fits against the screw-on sleeve 23. A rubber cap 243 is fitted on the outside of the piston plate. The rubber cap 243 includes an air hole. The protective cap 24 is sealed by contacting the inner wall of the screw-on sleeve 23 through the rubber cap 243.

[0027] The lower part of the L-shaped high-strength steel bar 25 is screwed and fixed to the screw-connect sleeve 23. The two L-shaped high-strength steel bars 25 connected indirectly on the anchoring steel plate 22 through the screw-connect sleeve 23 form an inverted U-shape. The left and right ends of the safety auxiliary hook 3 are respectively locked to the corresponding bent parts and free ends of the two L-shaped high-strength steel bars 25. The upper middle section of the L-shaped high-strength steel bar 25 is tied with a tightening steel wire 4. The anchoring assembly 2 is connected to the lifting equipment through the safety auxiliary hook 3. Specifically, the safety auxiliary hook 3 includes an upper hook body 31, a connecting block 32, a crossbeam 33, a lower cantilever hook body 35, and a locking block 37. The bottom of the upper hook body 31 is fixedly connected to the crossbeam 33 through the connecting block 32. The left front side and the right rear side of the crossbeam 33 are both fixedly connected to the bent arm vertical beam 34 through the connecting block 32. The lower end of the bent arm vertical beam 34 is fixedly connected to the lower cantilever hook body 35 through the connecting block 32. The lower cantilever hook body 35 is flat. The lower cantilever hook 35 has an arc-shaped surface on its inner side for accommodating and contacting the L-shaped high-strength steel bar 25. The rear of the lower cantilever hook 35 has a turntable connector 36 for restricting the outward slippage of the L-shaped high-strength steel bar 25. The turntable connector 36 includes a disc 364, an extended rotating shaft 361, and a limiting rotating rod 362. The lower cantilever hook 35 has a turntable hole, and the extended rotating shaft 361 is inserted through the turntable. In the hole, the disc 364 is fixedly welded to the extended rotating shaft 361 and pressed against the side of the lower cantilever hook 35. The outer end of the extended rotating shaft 361 is welded with a limiting rotating rod 362. The outer periphery of the disc 364 is provided with a rotation limiting body 363. The side of the lower cantilever hook 35 is provided with a pair of limiting blocks 351 that interact with the rotation limiting body 363. The rotation limiting body 363 provides a torsional torque when the limiting rotating rod 362 is pressed outward by the bent part of the L-shaped high-strength steel bar 25 through the clamping action of the left and right discs 364. In the specific installation and locking, the bent part of the L-shaped high-strength steel bar 25 is close to the extended rotating shaft 361 of the limiting rotating rod 362, while the free end of the other L-shaped high-strength steel bar 25 is relative to the extended rotating shaft 361. This makes the limiting lever arm shorter, and high rigidity limiting is achieved by using the lever principle. When operating the limiting rotating rod 362 for rotation limiting, the operating resistance is small.

[0028] A locking block 37 is fixed to the outer end of the lower cantilever hook 35. A pivot is provided in the middle of the locking block 37. The locking block 37 is connected to a pressure plate 38 for rearward locking through the pivot. The locking block 37 has an installation groove in the middle. The pressure plate 38 is connected to it through the pivot and can be rotated 180°. A plug 39 is inserted between the pressure plate 38 and the upper hook 31. The upper and lower surfaces of the plug 39 are inlaid with steel plates. The bottom steel plate has anti-slip guide strips. The body of the plug 39 can be made of elastic-plastic material. The plug 39 can be driven in from the front or the side of the hook. Since the hook opening direction of the lower cantilever hook 35 of the safety auxiliary hook 3 is staggered to the left and right, the force can be balanced, avoiding excessive skew caused by the unbalanced force position of the L-shaped high-strength steel bar 25, thereby reducing safety hazards.

[0029] To more clearly illustrate the principles of the present invention and to improve the construction efficiency of the above-mentioned device during construction, the present invention also discloses a method for detachable hoisting of prefabricated structures, comprising the following steps:

[0030] Step S1: Anchoring component 2 is set and positioned in the structural space of prefabricated retaining wall body 1, and the reinforcing sleeve 211, anchoring steel plate 22, and screw-on sleeve 23 in anchoring component 2 are sequentially fitted and screwed onto anchoring steel bar 21 from top to bottom.

[0031] Step S2: Insert the protective cap 24 into the upper end of the screw-on sleeve 23 to form a seal, and make the top of the protective cap 24 higher than the preset pouring height, and pour concrete. This step also includes keeping the outer plug 241a open for air circulation when inserting the protective cap 24 and sealing the outer plug 241a after the insertion is completed, so as to prevent concrete from entering the screw-on sleeve 23 during the pouring process.

[0032] Step S3: After the concrete of the precast retaining wall body 1 meets the strength requirements, the protective cap 24 is removed to form the cap opening 24a. Before removing the protective cap 24, the outer plug opening 241a is connected to the outside to eliminate negative pressure. The protective cap 24 can be easily removed from the top of the screw-on sleeve 23, while the rubber cap 243 itself falls into the inside of the screw-on sleeve 23. It can be used to prevent the L-shaped high-strength steel bar from being over-tightened and causing damage to the thread structure. At the same time, its elastic compression can also act on the threaded connection to produce a certain self-locking compression effect. The L-shaped high-strength steel bar 25 is screwed into the screw-on sleeve 23, and the upper parts of the L-shaped high-strength steel bar 25 are brought close together. That is, the upper horizontal cantilever parts of the two L-shaped high-strength steel bars 25 are screwed a certain number of times to achieve a state of parallelism and close proximity.

[0033] Step S4: The two L-shaped high-strength steel bars 25 are locked together using the safety auxiliary hook 3. Specifically, in this step, the pressure plate 38 is first opened, and the arc-shaped surfaces of the lower cantilever hooks 35 on both sides are simultaneously overlapped with the bent parts of the two L-shaped high-strength steel bars 25, with the corresponding free ends also overlapping the arc-shaped surfaces. At this time, the pressure plate 38 is flipped inward, and the plug 39 is knocked into the space above the pressure plate 38 from the side using an elastic hammer, thereby pressing the L-shaped high-strength steel bars 25 tightly. Then, the limit... The rotating rod 362 deflects forward towards the hook body and is supported in a horizontal position by the limiting block 351, thereby contacting and holding the bent part of the L-shaped high-strength steel bar 25, restricting the tendency of the L-shaped high-strength steel bar 25 to separate outward. Due to the elasticity of the steel bar itself, the middle of the horizontal cantilever part of the two L-shaped high-strength steel bars 25 separates. The upper middle section of the L-shaped high-strength steel bar 25 is fixed and tightened with the tightening wire 4 to further fix the two L-shaped high-strength steel bars 25, and the prefabricated retaining wall body 1 structure is lifted.

[0034] Step S5: Remove the safety auxiliary hook 3 from the L-shaped high-strength steel bar 25. The specific steps are the reverse of the installation steps. Then remove the L-shaped high-strength steel bar 25 from the anchoring component 2, and backfill the conical hole and screw sleeve 23 with cement grout. This achieves a non-destructive, safe and efficient hoisting process.

[0035] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A prefabricated detachable hoisting device, comprising a prefabricated retaining wall body, an anchoring assembly, and a safety auxiliary hook, wherein the anchoring assembly is cast into the prefabricated retaining wall body with concrete, and the safety auxiliary hook is used to lock and connect the anchoring assembly, wherein the anchoring assembly is symmetrically anchored on the left and right sides of the prefabricated retaining wall body, characterized in that: The anchoring assembly includes anchoring bars, anchoring steel plates, screw-in sleeves, protective caps, and L-shaped high-strength steel bars. Both the upper part of the anchoring bars and the lower part of the L-shaped high-strength steel bars have fine threaded sections. A reinforcing sleeve is pre-installed on the lower side of the fine threaded sections of the anchoring bars. The anchoring steel plate has two insertion holes, one at the front and one at the back, into which the anchoring bars are inserted. A screw-in sleeve is screwed onto the upper side of the fine threaded sections of the anchoring bars. The protective cap is used to seal and engage with the upper end of the screw-in sleeve during casting. The protective cap includes a through-hole and is generally frustoconical in shape. An independent plug is fixedly connected to the bottom of the protective cap. The through-hole is located at the central axis between the protective cap and the independent plug, and an external plug is provided at the top of the through-hole. The independent plug, which is connected to the outside, includes a conical connecting part at the upper end and a piston plate at the lower end. The upper outer periphery of the conical connecting part is fitted with a screw-on sleeve. A rubber cap is fitted on the outer side of the piston plate. The rubber cap includes an air hole. The protective cap is sealed by contacting the inner wall of the screw-on sleeve through the rubber cap. The lower part of the L-shaped high-strength steel bar is screwed and fixed to the screw-on sleeve. The two L-shaped high-strength steel bars connected in the front and rear through the screw-on sleeve on the anchoring steel plate form an inverted U-shape. The left and right ends of the safety auxiliary hook are locked to the corresponding bends and free ends of the two L-shaped high-strength steel bars. A tightening steel wire is tied to the upper middle section of the L-shaped high-strength steel bar. The anchoring assembly is connected to the lifting equipment through the safety auxiliary hook.

2. The prefabricated structure detachable hoisting device according to claim 1, characterized in that: The precast retaining wall body is a precast concrete component formed by concrete pouring. A hollow groove is reserved in the middle of the precast retaining wall body, and a concrete edge is formed around the precast retaining wall body. The anchoring component is anchored to the upper middle position of the concrete edge.

3. The prefabricated detachable hoisting device according to claim 1, characterized in that: The safety auxiliary hook includes an upper hook body, a connecting block, a crossbeam, a lower cantilever hook body, and a locking block. The bottom of the upper hook body is fixedly connected to the crossbeam via the connecting block. The front left side and the rear right side of the crossbeam are both fixedly connected to a curved arm vertical beam via connecting blocks. The lower end of the curved arm vertical beam is fixedly connected to the lower cantilever hook body via a connecting block. A locking block is fixed to the outer end of the lower cantilever hook body. A pivot is provided in the middle of the locking block. The locking block is connected to a pressure plate for rearward locking via the pivot. A plug is inserted between the pressure plate and the upper hook body.

4. The prefabricated structure detachable hoisting device according to claim 3, characterized in that: The lower cantilever hook is a flat hook body. The inner side of the lower cantilever hook body is provided with an arc-shaped surface for accommodating contact with the L-shaped high-strength steel bar. The rear part of the lower cantilever hook body is provided with a turntable connector for restricting the outward sliding of the L-shaped high-strength steel bar.

5. The prefabricated structure detachable hoisting device according to claim 4, characterized in that: The turntable connector includes a disc body, an extended rotating shaft, and a limiting rotating rod. The lower cantilever hook body has a turntable hole, and the extended rotating shaft is inserted through the turntable hole. The disc body is fixedly welded to the extended rotating shaft and presses against the side of the lower cantilever hook body. A limiting rotating rod is welded to the outer end of the extended rotating shaft. A rotation limiting body is provided on the outer periphery of the disc body, and a pair of limiting blocks that interact with the rotation limiting body are provided on the side of the lower cantilever hook body.

6. A method for detachable hoisting of a prefabricated structure using the device according to any one of claims 1-5, characterized in that: Includes the following steps, Step S1: Anchoring components are set and positioned within the structural space of the precast retaining wall body, and the reinforcing sleeve, anchoring steel plate, and screw-on sleeve in the anchoring components are sequentially fitted and screwed onto the anchoring steel bars from top to bottom. Step S2: Insert the protective cap into the upper end of the screw-on sleeve to form a seal, and make the top of the protective cap higher than the preset pouring height, and then pour concrete. Step S3: After the concrete of the precast retaining wall body meets the strength requirements, remove the protective cap, screw the L-shaped high-strength steel bars into the screw sleeve, and bring the upper parts of the L-shaped high-strength steel bars close together. Step S4: Secure the two L-shaped high-strength steel bars with safety auxiliary hooks, and tighten the upper middle section of the L-shaped high-strength steel bars with tightening wires, then lift the prefabricated retaining wall structure. Step S5: Remove the safety auxiliary hook from the L-shaped high-strength steel bar, then remove the L-shaped high-strength steel bar from the anchoring assembly, and backfill the conical hole and screw sleeve with cement grout.

7. A method for detachable hoisting of a prefabricated structure according to claim 6, characterized in that: Step S2 further includes maintaining airflow through the outer opening while inserting the protective cap and sealing the outer opening after insertion is complete.

Images