A pouring mold for highway pile foundation corrosion prevention and repair and a construction method thereof

Abstract

The application discloses a pouring mold for anticorrosion repair of a highway pile foundation and a construction method thereof, and relates to the technical field of pile foundation maintenance and repair, which comprises a glass fiber sleeve, a spigot arranged at the end of the glass fiber sleeve and forming a closed loop for the glass fiber sleeve through a clamping mode, and an auxiliary mechanism arranged on the outer side of the glass fiber sleeve and used for assisting the installation of the glass fiber sleeve; the auxiliary mechanism comprises a first protective sleeve and a second protective sleeve which are rotationally connected, a plurality of evenly distributed positioning pipes are fixedly installed on the outer sides of the first protective sleeve and the second protective sleeve, one gun head is installed in the interior of each positioning pipe, a plurality of evenly distributed extension pipes are fixedly installed on the outer side of the glass fiber sleeve, and one supporting rod is installed in the interior of each extension pipe. The pouring mold for anticorrosion repair of a highway pile foundation and the construction method thereof have the effects of multifunctionality, high work efficiency and operational perfection.

Description

Technical Field

[0001] This invention relates to the field of pile foundation maintenance technology, and in particular to a casting mold for anti-corrosion repair of highway pile foundations and its construction method. Background Technology

[0002] Whether it's highway pile foundations or pile foundation piers, long-term operation in a water-flow environment is susceptible to defects such as concrete spalling and exposed rebar due to natural environmental erosion, repeated vehicle loads, and the effects of de-icing salt. This leads to the exposure and corrosion of internal steel bars, seriously affecting the durability and safety of the pile foundation. The fiberglass sleeve reinforcement system, also known as the "jacket method," is a new technology for the reinforcement, repair, and protection of piers. It mainly consists of underwater epoxy grouting material and customized fiberglass sleeves, and can complete the repair and reinforcement of pile foundations made of various materials such as concrete piles, steel piles, and wooden piles.

[0003] However, in practical applications, existing fiberglass sleeve reinforcement systems suffer from several drawbacks. The need to splice multiple sleeve sections makes connection operations cumbersome, and controlling the spacing between the sleeve and the pier is difficult, making it hard to guarantee positioning accuracy. This leads to "eccentricity" after sleeve installation, resulting in uneven protection and repair of the pier. Furthermore, before the concrete grout inside the sleeve solidifies, the sleeve is susceptible to displacement and deformation due to the internal pressure of the grout. Even with limiters and reinforcement strips, this phenomenon cannot be effectively prevented. Therefore, to address these issues, it is necessary to develop a mold to assist in the installation of fiberglass sleeves. A temporary outer sleeve can be used to assist in the positioning and fixing of the fiberglass sleeve. After installation, the outer sleeve can be removed, thereby improving the installation accuracy and quality stability of the fiberglass sleeve. Summary of the Invention

[0004] This invention discloses a casting mold for anti-corrosion repair of highway pile foundations and its construction method, aiming to solve the technical problems of stability and operational perfection in the actual operation of existing fiberglass sleeve pile foundation repair technology.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A casting mold for anti-corrosion repair of highway pile foundation includes a fiberglass sleeve, an insertion port disposed at the end of the fiberglass sleeve and forming a closed loop with the fiberglass sleeve by a snap-fit ​​method, and an auxiliary mechanism for assisting the installation of the fiberglass sleeve is provided on the outside of the fiberglass sleeve. The auxiliary mechanism includes a first protective sleeve and a second protective sleeve that are rotatably connected. The first and second protective sleeves are engaged and distributed on the outside of the fiberglass sleeve. Several evenly distributed positioning tubes are fixedly installed on the outside of the first and second protective sleeves. The positioning tubes are divided into several layers at equal intervals along the vertical direction. A gun head is installed inside each positioning tube. Several evenly distributed extension tubes are fixedly installed on the outside of the fiberglass sleeve. Each extension tube is symmetrically distributed with one of the positioning tubes in the horizontal direction. A support rod is installed inside each extension tube. The end of the gun head is slidably inserted into the inside of the extension tube and forms a squeezing contact with the support rod. At the same time, the damping sensation of the insertion end of the gun head into the extension tube forms a connection and fixation for the fiberglass sleeve wrapped inside the first and second protective sleeves.

[0006] Based on the existing fiberglass sleeve repair technology for pile foundations, an auxiliary mechanism based on the first and second protective sleeves is added. First, using the gun head inside the first and second protective sleeves, in conjunction with the extension tube and support rod structure added inside the fiberglass sleeve, the quick connection of the fiberglass sleeve, the first protective sleeve, and the second protective sleeve is completed in sequence. Then, the first and second protective sleeves with built-in fiberglass sleeves are snapped and fixed to the outside of the pile foundation, and the fiberglass sleeve is quickly installed. Finally, the gun head pushes out the support rod to complete the positioning of the distance between the fiberglass sleeve and the pile foundation, and the grouting of the fiberglass sleeve is completed by the gun head. This invention utilizes the rigid structure of the auxiliary mechanism to ensure the positional accuracy of the fiberglass sleeve during installation and the structural strength during grouting, significantly improving installation quality. The invention employs a pre-fixing followed by overall installation process, transforming complex on-site splicing operations into factory pre-assembly and on-site overall installation, greatly simplifying on-site construction, improving construction efficiency, and reducing reliance on personnel experience for construction quality, thus ensuring quality stability. After the fiberglass sleeve is installed, positioned, and grouting is completed, the detachable outer casing structure (first protective sleeve, second protective sleeve) can be removed and recycled, enabling reuse, reducing construction costs, and conforming to the concept of green construction.

[0007] In a preferred embodiment, the inner wall of the extension tube is uniformly provided with a plurality of annular grooves, and the end of the support rod is provided with an annular component, the annular component and the annular grooves forming a preliminary elastic engagement.

[0008] By additionally setting an annular groove and an annular component between the extension tube and the support rod, the position of the extended support rod is controlled by the initial elastic engagement of the annular groove and the annular component, thereby assisting workers in positioning the distance between the fiberglass sleeve and the pile foundation. At the same time, the support rod can be retracted and reset twice between grouting operations, thereby improving the stability and fault tolerance of the equipment.

[0009] In a preferred embodiment, the annular component has a through-hole cavity, which is a cylindrical hollow cavity. Several alloy components are slidably installed on the inner wall of the inner cavity. The alloy components are slidably connected to the inner wall of the inner cavity. The alloy components move outward away from the inner cavity and engage and lock into the interior of the annular groove.

[0010] By extending the annular component and annular groove to include an inner cavity structure with built-in alloy components, when the support rod is positioned and the fiberglass sleeve is grouted, the pressure of the concrete grout can push the alloy components inside the cavity outward and into the annular groove, thereby directly locking the support rod and significantly improving the stability of the equipment after complete installation.

[0011] In a preferred embodiment, the contact ends of the first protective sleeve and the second protective sleeve are provided with an observation window, and the insertion port is distributed on the inner side of the observation window.

[0012] By adding an observation window structure on top of the first and second protective sleeves, workers can check the sealing of the connector after the fiberglass sleeve is locked in place, and make adjustments accordingly, thereby improving the fault tolerance and completeness of the equipment.

[0013] As can be seen from the above, the casting mold for anti-corrosion repair of highway pile foundations and its construction method provided by the present invention have the following technical effects.

[0014] Based on the existing fiberglass sleeve repair technology for pile foundations, an auxiliary mechanism based on the first and second protective sleeves is added. The gun head inside the first and second protective sleeves, together with the extension tube and support rod structure added inside the fiberglass sleeve, can sequentially complete the quick installation of the fiberglass sleeve, the positioning of the spacing, and the rigid filling of the fiberglass sleeve; thus, it has multiple benefits, as follows. Firstly, this invention utilizes the rigid structure of the auxiliary mechanism to ensure the positional accuracy of the fiberglass sleeve during installation and the structural strength during grouting, thus significantly improving the installation quality.

[0015] Secondly, this invention adopts a process of fixing first and then installing as a whole, which transforms the complex on-site splicing operation into factory pre-assembly and on-site overall installation, greatly simplifying the on-site construction difficulty, improving construction efficiency, and reducing the dependence of construction quality on personnel's operating experience, thus ensuring quality stability.

[0016] Thirdly, after the fiberglass sleeve is installed, positioned, and grouting is completed, the detachable outer sleeve structure (first protective sleeve and second protective sleeve) can be removed and recycled, which can be reused, reducing construction costs and conforming to the concept of green construction. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure proposed in this invention.

[0018] Figure 2 This is an exploded view of the overall structure proposed in this invention.

[0019] Figure 3 This is a top view of the structure of the fiberglass sleeve proposed in this invention after installation.

[0020] Figure 4 This is a schematic diagram of the positioning tube structure proposed in this invention.

[0021] Figure 5 This is a schematic diagram of the gun head connection structure proposed in this invention.

[0022] Figure 6 This is a partial exploded view of the gun head connection structure proposed in this invention.

[0023] Figure 7 This is an exploded view of the overall gun head connection structure proposed in this invention.

[0024] Figure 8 This is a cross-sectional view of the internal structure of the extension tube proposed in this invention.

[0025] Figure 9 The present invention proposes Figure 8 Enlarged structural diagram at point A in the middle.

[0026] Figure 10 The present invention proposes Figure 7 Enlarged structural diagram at point B In the diagram: 1. Fiberglass sleeve; 2. Insert; 3. Auxiliary mechanism; 4. First protective sleeve; 401. Bolt hole; 5. Second protective sleeve; 501. Observation window; 6. Positioning tube; 601. Scale; 7. Gun head; 701. Threaded groove; 8. Extension tube; 801. Flow chamber; 9. Support rod; 901. Plug; 10. Annular groove; 11. Annular part; 12. Inner cavity; 13. Alloy part. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0028] Reference Figures 1 to 10 A casting mold for anti-corrosion repair of highway pile foundation includes a fiberglass sleeve 1, an insertion port 2 set at the end of the fiberglass sleeve 1 and forming a closed loop with the fiberglass sleeve 1 by a snap-fit ​​method, and an auxiliary mechanism 3 for assisting the installation of the fiberglass sleeve 1 is provided on the outside of the fiberglass sleeve 1. The auxiliary mechanism 3 includes a first protective sleeve 4 and a second protective sleeve 5 that are rotatably connected. The first protective sleeve 4 and the second protective sleeve 5 are engaged and distributed on the outside of the fiberglass sleeve 1. Several evenly distributed positioning tubes 6 are fixedly installed on the outside of the first protective sleeve 4 and the second protective sleeve 5. The positioning tubes 6 are divided into several layers at equal intervals along the vertical direction. A gun head 7 is installed inside each positioning tube 6. Several evenly distributed extension tubes 8 are fixedly installed on the outside of the fiberglass sleeve 1. Each extension tube 8 is symmetrically distributed with a positioning tube 6 along the horizontal direction. A support rod 9 is installed inside each extension tube 8. The end of the gun head 7 is slidably inserted into the inside of the extension tube 8 and forms a squeezing contact with the support rod 9. At the same time, the damping sensation of the insertion end of the gun head 7 into the extension tube 8 forms a connection and fixation for the fiberglass sleeve 1 wrapped inside the first protective sleeve 4 and the second protective sleeve 5.

[0029] In this embodiment: the worker unfolds the first protective sleeve 4 and the second protective sleeve 5, and connects the several rows of extension tubes 8 inside the fiberglass sleeve 1 with the gun head 7 located outside the first protective sleeve 4 and the second protective sleeve 5, fixing the fiberglass sleeve 1 to the inner wall of the first protective sleeve 4 and the second protective sleeve 5. Then, the worker uses a lifting device to hoist the first protective sleeve 4 and the second protective sleeve 5 containing the fiberglass sleeve 1 to the outside of the pile foundation to be repaired, and snaps the first protective sleeve 4 and the second protective sleeve 5 into place on the outside of the pile foundation, then locks them in place with high-strength bolts. During this process, it is necessary to ensure that the insertion port 2 at the end of the fiberglass sleeve 1 closes synchronously. During the closing stage of the insertion port 2, the worker needs to fill the joint of the insertion port 2 with sealant and drive the high-strength bolts and rivets into the insertion port 2. Inside the fiberglass sleeve 1, the fiberglass sleeve 1 is locked. Then, two workers need to work together to first rotate the two sets of gun heads 7 located diagonally, and then rotate the remaining gun heads 7 in sequence, causing the gun heads 7 to move along the inside of the extension tube 8 and push out the support rod 9, so that the support rod 9 and the pile foundation to be repaired are squeezed into contact, thus completing the positioning of the fiberglass sleeve 1. Next, the workers reset and rotate the gun heads 7 to the initial position, and connect the external grouting machine to the gun heads 7, and inject grout into the inside of the fiberglass sleeve 1 from bottom to top in layers. After the concrete grout in the gap between the fiberglass sleeve 1 and the pile foundation has solidified, the workers remove the high-strength bolts between the first protective sleeve 4 and the second protective sleeve 5, and remove the first protective sleeve 4 and the second protective sleeve 5 from the outside of the fiberglass sleeve 1 by knocking.

[0030] The extension tube 8 has several evenly distributed flow chambers 801 through its sidewall, which provide flow space for the concrete slurry. The concrete slurry injected from the nozzle 7 flows through the flow chambers 801 into the gap between the fiberglass sleeve 1 and the pile foundation. The end of the support rod 9 is provided with a plug 901, which makes contact with the outer wall of the pile foundation to be repaired by squeezing through the plug 901.

[0031] Reference Figures 7-10In a preferred embodiment, the inner wall of the extension tube 8 is uniformly provided with a plurality of annular grooves 10, and the end of the support rod 9 is provided with an annular member 11. The annular member 11 and the annular grooves 10 form a preliminary elastic engagement. An inner cavity 12 is provided through the interior of the annular member 11. The inner cavity 12 is a cylindrical hollow cavity. A plurality of alloy members 13 are slidably installed on the inner wall of the inner cavity 12. The alloy members 13 are slidably connected to the inner wall of the inner cavity 12. The alloy members 13 move outward in a direction away from the inner cavity 12 and engage and lock into the interior of the annular grooves 10.

[0032] The worker rotates the remaining nozzles 7 in sequence, causing them to move along the inside of the extension tube 8 and squeeze the annular part 11. This causes the annular part 11 to elastically lock and displace along the inside of the annular groove 10, pushing out the support rod 9. This allows the support rod 9 to squeeze into contact with the pile foundation to be repaired, completing the positioning of the fiberglass sleeve 1. Immediately afterwards, the worker resets and rotates the nozzle 7 to its initial position and connects the external grouting machine to the nozzle 7. Grouting is then performed in layers from bottom to top inside the fiberglass sleeve 1 (layered grouting means first connecting the lower nozzle 7 for grouting, and then connecting the upper nozzle 7 after grouting is completed, thereby improving the compactness of the grout). At the same time, concrete slurry enters the interior of the inner cavity 12 and squeezes and pushes the alloy part 13 outward in a direction away from the inner cavity 12, completely locking the alloy part 13 into the inside of the annular groove 10. After the concrete slurry at the gap between the fiberglass sleeve 1 and the pile foundation solidifies, the support rod 9 is locked in place.

[0033] Reference Figures 1 to 2 , Figure 4 In a preferred embodiment, the contact ends of the first protective sleeve 4 and the second protective sleeve 5 are provided with an observation window 501, and the insertion port 2 is distributed on the inner side of the observation window 501. The upper and lower sides of the contact ends of the first protective sleeve 4 and the second protective sleeve 5 are symmetrically provided with bolt holes 401, and the first protective sleeve 4 and the second protective sleeve 5 are locked together after being closed by the bolt holes 401.

[0034] Workers use a hoist to lift and place the first protective sleeve 4 and the second protective sleeve 5 of the built-in fiberglass sleeve 1 on the outside of the pile foundation to be repaired. The first protective sleeve 4 and the second protective sleeve 5 are then locked onto the outside of the pile foundation. High-strength bolts are then inserted into the bolt holes 401 and locked in place. During this process, workers need to ensure that the insertion port 2 at the end of the fiberglass sleeve 1 is closed and adjusted synchronously through the open observation window 501.

[0035] Reference Figures 5 to 8 In a preferred embodiment, a scale 601 is fixedly installed on the top of the positioning tube 6, and a threaded groove 701 is provided on the outer side of the gun head 7. The gun head 7 is threadedly connected to the positioning tube 6 through the threaded groove 701.

[0036] The worker rotates the gun head 7, causing it to advance horizontally along the inside of the positioning tube 6 via the threaded groove 701. During this process, the worker can determine the depth of the advance of the gun head 7 using the scale 601.

[0037] Working principle: During use, the worker unfolds the first protective sleeve 4 and the second protective sleeve 5, and connects the several rows of extension tubes 8 inside the fiberglass sleeve 1 with the gun head 7 located outside the first protective sleeve 4 and the second protective sleeve 5, fixing the fiberglass sleeve 1 to the inner wall of the first protective sleeve 4 and the second protective sleeve 5. Then, the worker uses a hoist to lift and place the first protective sleeve 4 and the second protective sleeve 5 containing the fiberglass sleeve 1 onto the outside of the pile foundation to be repaired, and snaps the first protective sleeve 4 and the second protective sleeve 5 into place on the outside of the pile foundation. High-strength bolts are then inserted into the bolt holes 401 and locked in place. During this process, the worker must ensure that the insertion port 2 at the end of the fiberglass sleeve 1 closes synchronously through the open observation window 501. During the closing stage of the insertion port 2, the worker needs to fill the joint of the insertion port 2 with sealant and drive the high-strength bolts and rivets into the insertion port 2 to lock the fiberglass sleeve 1 in place. Afterwards, two workers need to cooperate and first synchronously rotate the diagonally opposite... The two sets of nozzles 7 at the line are rotated in sequence, causing the nozzles 7 to move along the inside of the extension tube 8 and squeeze the annular part 11. This causes the annular part 11 to elastically lock and displace along the inside of the annular groove 10, pushing out the support rod 9. This allows the support rod 9 to squeeze into contact with the pile foundation to be repaired, completing the positioning of the fiberglass sleeve 1. Next, the worker resets and rotates the nozzles 7 to the initial position and connects the external grouting machine to the nozzles 7. Grouting is then carried out layer by layer from bottom to top into the inside of the fiberglass sleeve 1. At the same time, the concrete grout enters the inside of the inner cavity 12 and squeezes and pushes the alloy part 13 outward. The outward-moving alloy part 13 is completely locked into the inside of the annular groove 10. After the concrete grout in the gap between the fiberglass sleeve 1 and the pile foundation solidifies, the support rod 9 is locked. After that, the worker removes the high-strength bolts between the first protective sleeve 4 and the second protective sleeve 5 and removes the first protective sleeve 4 and the second protective sleeve 5 from the outside of the fiberglass sleeve 1 by knocking.

[0038] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A casting mold for anti-corrosion repair of highway pile foundations, comprising a fiberglass sleeve (1) and an insertion port (2) disposed at the end of the fiberglass sleeve (1) and forming a closed loop with the fiberglass sleeve (1) by a snap-fit ​​mechanism, characterized in that, An auxiliary mechanism (3) is provided on the outside of the fiberglass sleeve (1) to assist in the installation of the fiberglass sleeve (1). The auxiliary mechanism (3) includes a first protective sleeve (4) and a second protective sleeve (5) that are rotatably connected. The first protective sleeve (4) and the second protective sleeve (5) are engaged and distributed on the outside of the fiberglass sleeve (1). Several evenly distributed positioning tubes (6) are fixedly installed on the outside of the first protective sleeve (4) and the second protective sleeve (5). The positioning tubes (6) are divided into several layers at equal intervals along the vertical direction. A gun head (7) is installed inside each positioning tube (6). Several evenly distributed positioning tubes (7) are fixedly installed on the outside of the fiberglass sleeve (1). The extension tubes (8) are distributed, and each extension tube (8) is symmetrically distributed with a positioning tube (6) in the horizontal direction. Each extension tube (8) has a support rod (9) installed inside. The end of the gun head (7) is slidably inserted into the interior of the extension tube (8) and forms a squeezing contact with the support rod (9). At the same time, the damping sensation of the gun head (7) and the contact end of the extension tube (8) is used to connect and fix the fiberglass sleeve (1) wrapped inside the first protective sleeve (4) and the second protective sleeve (5).

2. The casting mold for anti-corrosion repair of highway pile foundations according to claim 1, characterized in that, The inner wall of the extension tube (8) is uniformly provided with several annular grooves (10), and the end of the support rod (9) is provided with an annular part (11). The annular part (11) and the annular groove (10) form a preliminary elastic engagement.

3. The casting mold for anti-corrosion repair of highway pile foundations according to claim 2, characterized in that, The annular part (11) has an inner cavity (12) that runs through it. The inner cavity (12) is a cylindrical hollow cavity. Several alloy parts (13) are slidably installed on the inner wall of the inner cavity (12). The alloy parts (13) are slidably connected to the inner wall of the inner cavity (12). The alloy parts (13) move outward away from the inner cavity (12) and engage and lock into the interior of the annular groove (10).

4. The casting mold for anti-corrosion repair of highway pile foundations according to claim 1, characterized in that, The first protective sleeve (4) and the second protective sleeve (5) have an observation window (501) through their contact ends, and the insertion port (2) is located inside the observation window (501).

5. A casting mold for anti-corrosion repair of highway pile foundations according to claim 1, characterized in that, The first protective sleeve (4) and the second protective sleeve (5) are symmetrically provided with bolt holes (401) on the upper and lower sides of their contact ends, and the first protective sleeve (4) and the second protective sleeve (5) are locked together by the bolt holes (401).

6. A casting mold for anti-corrosion repair of highway pile foundations according to claim 1, characterized in that, A ruler (601) is fixedly installed on the top of the positioning tube (6).

7. A casting mold for anti-corrosion repair of highway pile foundations according to claim 1, characterized in that, The gun head (7) is provided with a threaded groove (701) on the outside, and the gun head (7) is threadedly connected to the positioning tube (6) through the threaded groove (701).

8. A casting mold for anti-corrosion repair of highway pile foundations according to claim 1, characterized in that, The sidewall of the extension tube (8) is provided with several evenly distributed flow cavities (801) that provide flow space for concrete slurry.

9. A casting mold for anti-corrosion repair of highway pile foundations according to claim 1, characterized in that, The end of the support rod (9) is provided with a plug (901), and the plug (901) makes contact with the outer wall of the pile foundation to be repaired by squeezing.

10. A construction method for a casting mold for anti-corrosion repair of highway pile foundations according to claim 1, characterized in that, Includes the following steps; S1: The worker unfolds the first protective sleeve (4) and the second protective sleeve (5) flat, and connects the several rows of extension tubes (8) located inside the fiberglass sleeve (1) with the gun head (7) located outside the first protective sleeve (4) and the second protective sleeve (5), and fixes the fiberglass sleeve (1) to the inner wall of the first protective sleeve (4) and the second protective sleeve (5); S2: Workers use a hoist to lift and place the first protective sleeve (4) and the second protective sleeve (5) of the fiberglass sleeve (1) on the outside of the pile foundation to be repaired, and then lock the first protective sleeve (4) and the second protective sleeve (5) on the outside of the pile foundation and lock them with high-strength bolts. During this period, it is necessary to ensure that the insertion port (2) at the end of the fiberglass sleeve (1) closes synchronously. S3: During the closing stage of the socket (2), the worker needs to fill the joint of the socket (2) with sealant and drive high-strength bolts and rivets into the socket (2) to lock the fiberglass sleeve (1). S4: After that, the two workers need to cooperate with each other, first rotate the two sets of gun heads (7) located on the diagonal in sync, and then rotate the remaining gun heads (7) in sequence, so that the gun heads (7) move along the inside of the extension tube (8) and push out the support rod (9), so that the support rod (9) and the pile foundation to be repaired are squeezed into contact, and the positioning of the fiberglass sleeve (1) is completed. S5: Afterwards, the worker resets and rotates the gun head (7) to the initial position, connects the external grouting machine to the gun head (7), and injects grout into the interior of the fiberglass sleeve (1) from bottom to top through the gun head (7); S6: After the concrete grout between the fiberglass sleeve (1) and the pile foundation has solidified, the worker removes the high-strength bolts between the first protective sleeve (4) and the second protective sleeve (5), and removes the first protective sleeve (4) and the second protective sleeve (5) from the outside of the fiberglass sleeve (1) by knocking.

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