Explosion-proof module rod piece mounting and fixing construction method

Abstract

The application discloses a construction method for mounting and fixing an explosion-proof mold rod piece, and comprises the following construction steps: S1, a screw rod is horizontally arranged through the hole of two formworks; S2, a fixing piece is arranged on the screw rod through the accommodation portion; S3, a shell is arranged on the screw rod, and a first push plate is connected with the accommodation portion, and a second push plate is in contact with the accommodation portion; S4, a plug is arranged, the sleeve is inflated, then a driver I is started to be elongated, the hook part of the hook pull rod is arranged on the inside of the formwork through the plug, then the driver I is started to be retracted, the hook pull rod and the accommodation portion are fixed by using a locking piece, a driver II is started to make the fixing piece abut against the outside of the formwork; S5, concrete is poured; and S6, after the pouring of the concrete is completed, the locking piece is released, the driver I and the driver II are retracted, the hook part is arranged to protrude from the inside of the formwork, then the shell on one side is separated from the screw rod, then the screw rod is pulled out from the other side, and the separation of the explosion-proof mold rod mounting and fixing device and the formwork is completed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building construction, in particular to a construction method for installing and fixing an explosion-proof formwork rod piece. BACKGROUND

[0002] The conventional formwork, heat preservation and plastering of an outer wall project are generally constructed in one pass, and since the heat preservation integrated heat preservation formwork is manufactured by combining three passes in a factory, compared with the conventional process, the heat preservation integrated construction directly has the heat preservation and plastering two-pass construction.

[0003] However, in the construction process, the concrete blocks are used in combination with the screw rods to prevent and control in the ordinary counter-pulling screw rod construction, but the concrete blocks are prone to displacement during the pouring process, and the inner side of the formwork is prone to bulging during pouring, and the thickness of the integrated heat preservation plate used in the present project reaches ten centimeters, which is more prone to bulging, and the sleeve is prone to deformation and corrosion during the pouring process, resulting in leakage and explosion of the formwork, so that the integrated heat preservation plate is difficult to repair due to the explosion of the integrated heat preservation plate during the pouring process, which seriously affects the construction quality, and the integrated heat preservation plate of the outer wall is difficult to repair after the explosion of the integrated heat preservation plate, the repair process is more, and the repair stability is not as firm as the pouring and bonding, in addition, the traditional counter-pulling screw is not easy to recycle, which increases the construction cost, and in addition, the installation is very troublesome.

[0004] Therefore, how to avoid the explosion of the membrane during the construction process, especially the pouring process of the concrete, reduce the post-repair of the integrated heat preservation plate and the inner wall, and enable the device to be recycled and utilized again, thereby saving the installation steps, is the current construction method that needs to be improved. SUMMARY

[0005] In order to solve the above technical problems, the present application provides a construction method for installing and fixing an explosion-proof formwork rod piece.

[0006] The construction method for installing and fixing the explosion-proof formwork rod piece provided by the present application adopts the following technical scheme:

[0007] 11. A construction method for installing and fixing an explosion-proof formwork rod piece, comprising the following construction steps:

[0008] S1: The screw rod of the explosion-proof formwork rod installation and fixing device is horizontally passed through two formworks through the hole of the formwork, and the two sides of the screw rod are respectively extended from the outer ends of the two formworks, and the sleeve located on the screw rod is located on the inner side of the two formworks;

[0009] S2: The fixing piece of the explosion-proof formwork rod installation and fixing device is placed on the screw rod through the placement part of the explosion-proof formwork rod installation and fixing device;

[0010] S3: The shell of the explosion-proof formwork rod installation and fixing device is installed on the screw rod, and the first push plate of the explosion-proof formwork rod installation and fixing device is connected with the placement part, and the second push plate is in contact with the placement part.

[0011] S4: install the plug of the explosion-proof form bar mounting and fixing device to block the hole of the formwork, then inflate the sleeve through the plug to make the sleeve expand, then start the driver one to extend, make the hook of the hook pull rod of the explosion-proof form bar mounting and fixing device pass through the plug and be located inside the formwork, then start the driver one to retract, then use the locking piece of the explosion-proof form bar mounting and fixing device to fix the hook pull rod and the setting part, and start the driver two to make the fixing piece abut against the outside of the formwork;

[0012] S5: concrete pouring;

[0013] S6: after the concrete pouring is completed, release the locking piece, then start the driver one and the driver two to retract, make the hook pass out of the inside of the formwork, then separate the shell on one side from the screw rod, then pull out the screw rod from the other side, and complete the separation of the explosion-proof form bar mounting and fixing device from the formwork.

[0014] Optionally, the explosion-proof form bar mounting and fixing device comprises:

[0015] The fixing mechanism comprises a screw rod, a hook pull rod, a sleeve and a fixing piece, the screw rod transversely passes through both sides of the formwork through the hole of the formwork, the sleeve is sleeved on the outer contour of the screw rod, and the outer contour of the sleeve is telescopic;

[0016] The sleeve is coaxially sleeved outside the screw rod, after passing through the hole of the formwork, the sleeve can be driven to expand to make the axial two ends of the sleeve abut against the inside of the two formworks respectively, the screw rod can slide axially relative to the sleeve, the hook pull rod is slidingly arranged on the screw rod along the axial direction of the screw rod, the hook pull rod has a hook, the hook is rotationally arranged on the hook pull rod through an elastic piece one, the elastic piece one drives the hook and the hook pull rod to form an acute angle, after the sleeve expands, the hook pull rod passes through the hole and is located inside the sleeve, so that the hook is used to abut against the inside of the formwork, and the fixing piece is arranged on the screw rod and used to abut against the outside of the formwork;

[0017] The mounting mechanism comprises a shell, a driver one, a sleeve and a push plate one, the shell is connected with the screw rod, the push plate one is slidingly arranged on the sleeve along the axial direction of the screw rod, the driver one is used to drive the push plate one to move, and the push plate one is used to be connected with the hook pull rod.

[0018] Optionally, a spring is arranged between the movable end of the driver one and the push plate one, and the spring is used to apply a pre-tightening force to the push plate one in the direction close to the driver one.

[0019] Optionally, a push plate two is slidingly arranged on the shell along the circumferential direction of the screw rod, in S3, the push plate two is connected with the fixing piece, and the driver two is used to drive the push plate two to move, so that the fixing piece abuts against the inside of the formwork.

[0020] Optionally, the fixing member comprises a sliding card, the sliding card is provided with a receiving portion for receiving the rod member, and the driver II drives the sliding card to move so that the sliding card and the rod member arranged in the receiving portion abut against the outer side of the formwork in S4.

[0021] Optionally, the sleeve comprises a sleeve body and an air bag portion, the sleeve body is arranged outside the air bag portion, the plug has an inflation channel, the inflation channel is communicated with the air bag portion when the plug seals the hole in S4, and the air bag portion can be inflated to drive the sleeve body to expand along the radial direction of the screw rod.

[0022] Optionally, the plug is provided with a protruding portion, the protruding portion is matched with the diameter of the hole, the inflation channel is arranged between the plug and the protruding portion, and the protruding portion extends into the hole after the plug abuts against the outer side of the formwork, so that the inflation channel is communicated with the air bag portion.

[0023] Optionally, the hook rod comprises a connecting rope and a rod portion, the connecting rope is wound around the screw rod, elastic members II are arranged at the connecting rope and the screw rod, the elastic members II are used for applying a pre-tightening force away from the formwork to the connecting rope, the rod portion is arranged at the movable end of the connecting rope, and the hook portion is arranged at the end of the rod portion away from the connecting rope.

[0024] Optionally, the mounting portion is slidingly matched with the screw rod, and a limiting member is arranged on the mounting portion and used for limiting the extension and retraction of the hook rod.

[0025] Optionally, the plug is provided with a perforation for allowing the rod portion to pass through.

[0026] In summary, the present application comprises at least one of the following beneficial technical effects: the construction method can effectively solve the installation and fixation of the mold rod, a double F buckle stress is formed in the formwork through the fixing mechanism, the double F buckle stress can bear the stress on the inner and outer sides, the formwork system is more stable, and the installation of the fixing mechanism through the installation mechanism is very convenient, and the manpower is saved. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a schematic diagram of the overall structure of the embodiment of the present application;

[0028] Figure 2 is a schematic diagram of the partial structure of the embodiment of the present application;

[0029] Figure 3 is a side view of the sleeve of the embodiment of the present application;

[0030] Figure 4 is a top view of the installation mechanism of the embodiment of the present application.

[0031] Explanation of reference signs: 1, hook pull rod; 2, hole; 3, fixing piece; 4, elastic piece one; 5, locking piece; 6, shell; 7, placement part; 8, containing part; 9, plug; 91, protruding part; 10, screw rod; 11, sleeve; 111, sleeve body; 112, air bag part; 113, inflation part; 12, driver one; 13, push plate one; 14, sleeve; 15, spring; 16, driver two; 17, push plate two. DETAILED DESCRIPTION

[0032] The following will be described in detail below with reference to the accompanying drawings. Figures 1-4 The present application is further described in detail.

[0033] The embodiment of the present application discloses a construction method for mounting and fixing an explosion-proof mold rod piece.

[0034] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 A construction method for mounting and fixing an explosion-proof mold rod piece, comprising the following construction steps:

[0035] S1: The screw rod 10 of the explosion-proof mold rod mounting and fixing device is transversely arranged through two formworks through the holes 2 of the formworks, and the two sides of the screw rod 10 are respectively arranged to protrude from the outer ends of the two formworks, and the sleeve 11 located on the screw rod 10 is located on the inner side of the two formworks;

[0036] S2: The fixing piece 3 of the explosion-proof mold rod mounting and fixing device is placed on the screw rod 10 through the placement part 7 of the explosion-proof mold rod mounting and fixing device;

[0037] S3: The shell 6 of the explosion-proof mold rod mounting and fixing device is mounted on the screw rod 10, and the push plate one 13 of the explosion-proof mold rod mounting and fixing device is connected with the placement part 7, and the push plate two 17 is in contact with the placement part 7;

[0038] S4: The plug 9 of the explosion-proof mold rod mounting and fixing device is installed to block the hole 2 of the formwork, then the sleeve 11 is inflated through the plug 9 to make the sleeve 11 expand, then the driver one 12 of the explosion-proof mold rod mounting and fixing device is started to elongate, so that the hook part of the hook pull rod 1 of the explosion-proof mold rod mounting and fixing device passes through the plug 9 and is located on the inner side of the formwork, then the driver one 12 is started to contract, then the locking piece 5 of the explosion-proof mold rod mounting and fixing device is used to fix the hook pull rod 1 and the placement part 7, and the driver two 16 is started to make the fixing piece 3 abut against the outer side of the formwork;

[0039] S5: concrete pouring;

[0040] S6: After the concrete is poured, the locking element 5 is released, and then the driver one 12 and the driver two 16 are started to retract, so that the hook portion extends from the inside of the formwork, and then the shell 6 on one side is separated from the screw rod 10, and then the screw rod 10 is pulled out from the other side, and the separation of the explosion-proof formwork rod installation fixing device and the formwork is completed.

[0041] In this embodiment, the explosion-proof formwork rod installation fixing device comprises a fixing mechanism and an installation mechanism. The fixing mechanism comprises a screw rod 10, a hook rod 1, a sleeve 11, a plug 9 and a fixing element 3. The screw rod 10 passes through the two sides of the formwork through the hole 2 of the formwork. The sleeve 11 is sleeved on the outer contour of the screw rod 10, and the outer contour of the sleeve 11 is telescopic. The sleeve 11 is coaxially sleeved on the outside of the screw rod 10. After the sleeve 11 passes through the hole 2 of the formwork, the sleeve 11 can be driven to expand so that the two axial ends of the sleeve 11 are respectively abutted against the inside of the two formworks. The screw rod 10 can slide axially relative to the sleeve 11. The hook rod 1 is arranged in the screw rod 10 in sliding fit along the axial direction of the screw rod 10. The hook rod 1 has a hook portion. The hook portion is arranged in the hook rod 1 in rotating fit through the elastic element one 4. The elastic element one 4 drives the hook portion and the hook rod 1 to form an acute angle. After the sleeve 11 is expanded, the hook rod 1 passes through the hole 2 and is located in the sleeve 11 so that the hook portion is used to abut against the inside of the formwork. The fixing element 3 is arranged on the screw rod 10 and is used to abut against the outside of the formwork. The plug 9 is used to block the hole 2 of the formwork. The plug 9 is provided with a perforation for the rod portion to pass through. The installation mechanism comprises a shell 6, a driver one 12, a sleeve 14 and a push plate one 13. The shell 6 is connected with the screw rod 10. The push plate one 13 is arranged in the sleeve 14 in sliding fit along the axial direction of the screw rod 10. The driver one 12 is used to drive the push plate one 13 to move. The push plate one 13 is used to be connected with the hook rod 1. The method can effectively solve the installation and fixation of the formwork rod. A double-F buckle force is formed in the formwork through the fixing mechanism, so that it can bear the force on the inside and outside. The formwork system is more stable. The installation of the fixing mechanism is very convenient through the installation mechanism, and the manpower is saved.

[0042] In this embodiment, the device is used for the support and fixation of the integrated thermal insulation formwork. The integrated thermal insulation formwork has three processes of formwork, thermal insulation and plastering. The three processes are changed into one process by using the material. The integrated thermal insulation formwork is used as the outer wall formwork. The plastic pegs are cast together with the concrete to form the integrated construction of the formwork, thermal insulation and plastering.

[0043] The hole 2 is arrayed on the formwork, and each screw rod 10 passes through the two sides of two formworks. The screw rod 10 is used as a bearing base to connect the two formworks.

[0044] In the embodiment, the sleeve 11 is radially retractable. Specifically, the sleeve 11 comprises a sleeve body 111 and a balloon part 112, the sleeve body 111 is arranged outside the balloon part 112, and the balloon part 112 is inflated to drive the sleeve body 111 to expand along the radial direction of the screw rod 10.

[0045] In the embodiment, the sleeve body 111 comprises a fixed part and a sliding part, which are circumferentially closed to form a ring. The sliding part is slidingly arranged in the fixed part, and after the balloon part 112 is inflated, the sliding part slides out of the fixed part, so that the overall size of the sleeve body 111 increases. The plug 9 is provided with a protruding part 91 which is matched with the diameter of the hole 2, and the plug 9 and the protruding part 91 have an inflation channel. When the plug 9 abuts against the outside of the formwork, the protruding part 91 extends into the hole 2, and the inflation channel is in communication with the balloon part 112. The inflation channel in the plug 9 has a blocking piece for blocking the inflation channel, which effectively prevents the gas from escaping from the inflation channel of the plug 9. The balloon part 112 has an inflation port made of elastic material, and the inflation channel in the protruding part 91 has an inflation needle which is inserted into the inflation port for inflation. After the two are separated, the inflation port is automatically closed.

[0046] In the embodiment, the protruding part 91 blocks the hole 2, effectively preventing the concrete from blocking the hole 2 when the formwork is removed, so that the formwork at the hole 2 does not need to be removed again after the formwork is removed, which not only inflates the balloon part 112, but also ensures the flatness of the concrete pouring.

[0047] In the embodiment, the diameter of the hole 2 of the formwork is greater than the diameter of the screw rod 10 and less than the size of the expanded sleeve 11.

[0048] The fixing part 3 comprises a sliding clamp, and the sliding clamp has a receiving part 8 for receiving a rod. In the embodiment, the rod is a steel pipe which is placed in the receiving part 8 to abut against the outside of the formwork, thereby improving the support effect of the formwork. The driver two 16 is used to drive the sliding clamp to move so that the sliding clamp and the rod arranged in the receiving part 8 abut against the outside of the formwork.

[0049] In the embodiment, the screw rod 10 is provided with a mounting part 7, and the mounting part 7 is provided with a limiting part for limiting the extension and retraction of the hook rod 1. The hook rod 1 comprises a connecting rope and a rod part. The connecting rope is wound around the screw rod 10, and the connecting rope and the screw rod 10 are provided with an elastic part two for applying a pre-tightening force to the connecting rope away from the formwork. In the embodiment, the elastic part two is a coil spring. The rod part is arranged at the movable end of the connecting rope, and a hook part is arranged at the end of the rod part away from the connecting rope. When the coil spring expands, the connecting rope contracts, and the rod part moves towards the mounting part 7.

[0050] In the embodiment, the elastic member 4 is a torsion spring, and in the absence of external force, the torsion spring is used to drive the included angle between the hook portion and the rod portion to form an acute angle. When the hook rod is taken out, a larger pulling force is applied outwardly, the torsion spring is driven to be in a stretched state, and when the two are horizontal, the hook rod 1 can be taken out, the fixing of the formwork is completed, and the hook rod can be used again.

[0051] The locking member 5 is arranged on the mounting portion 7 and is used to fix the rod portion. In the embodiment, the locking member 5 is a bolt, the rod portion is provided with a through hole, and the mounting portion 7 is provided with a plurality of threaded holes. When the hook portion abuts against the inner side of the formwork, the bolt passes through the rod portion and is threadedly connected with the corresponding threaded hole and abuts against the screw rod 10, so that the mounting portion 7 and the hook rod 1 are fixed relative to the screw rod 10. During the pouring of concrete, the hook portion supports the formwork more stably.

[0052] When the inner side of the formwork is supported, the hook portion and the sleeve 11 are used for support, and when the outer side of the formwork is supported, the steel pipe, the plug 9 and the sliding clamp are used for support, so that the inner and outer sides of the formwork are more stably supported and the condition of the formwork bursting is effectively avoided.

[0053] In the embodiment, the housing 6 is used as a mounting base, the housing 6 is provided with a threaded hole, and the threaded hole is used to be threadedly connected with the screw rod 10, so that the mounting mechanism is mounted on the screw rod 10.

[0054] The spring 15 is arranged between the movable end of the driver 12 and the push plate 13 and is used to apply a pre-tightening force to the push plate 13 in the direction of approaching the driver 12. In the embodiment, the driver 12 is an electric cylinder, and the movable end of the electric cylinder is connected with the spring 15. The push plate 13 is used to be connected with the mounting portion 7, the mounting portion 7 is slidingly fitted on the screw rod 10, and in the embodiment, the front end of the push plate 13 is provided with a fixing groove, the fixing groove is provided with a latch, and the latch is used to fix the mounting portion 7 on the fixing groove of the push plate 13. When the hook portion is taken out from the inner side of the formwork, the hook portion is forcibly taken out through the contraction of the driver 12, and the installation and dismounting are more convenient.

[0055] The driver 16 is arranged on the two sides of the housing 6, the push plate 17 is slidingly fitted on the housing 6 along the circumference of the screw rod 10, the push plate 17 is used to be connected with the fixing member 3, and the driver 16 is used to drive the push plate 17 to move. In the embodiment, the driver 16 is an electric cylinder, the electric cylinder is elongated to drive the push plate 17 to move, so that the sliding clamp abuts against the inner side of the formwork and the outer side of the formwork is more stably fixed.

[0056] The construction method can realize rapid installation and disassembly, the formwork support is more stable, the probability of formwork explosion is effectively reduced, in addition, the heat preservation integration and the double clamping formed on the inner and outer sides of the formwork are adopted, the inner and outer sides of the heat preservation integration are stressed, cannot be moved to any one side, compared with the traditional heat preservation integration construction process, the stability is better, the post-maintenance cost is lower, the applicability is stronger. Greatly reducing the post-maintenance of the inner and outer walls, saving the construction period of the project, simple construction, energy saving and environmental protection, at the same time, the post-maintenance period can be shortened, and the post-maintenance operation of the outer wall surface is reduced.

[0057] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A method for installing and fixing explosion-proof formwork members, characterized in that: The construction steps include the following: S1: The screw rod of the explosion-proof mold rod installation and fixing device is passed through the opening of the mold plate and crosses the two mold plates horizontally, so that the two sides of the screw rod extend from the outer ends of the two mold plates respectively, and the sleeve on the screw rod is located inside the two mold plates. S2: Place the fixing part of the explosion-proof mold rod mounting and fixing device through the mounting part of the explosion-proof mold rod mounting and fixing device onto the screw rod; S3: Install the housing of the explosion-proof mold rod mounting and fixing device on the screw rod, and connect the push plate one of the explosion-proof mold rod mounting and fixing device to the mounting part, and the push plate two to contact the mounting part; S4: Install the plug of the explosion-proof formwork rod installation and fixing device to block the opening of the formwork. Then, inflate the sleeve through the plug to expand the sleeve. Then, activate the first driver of the explosion-proof formwork rod installation and fixing device to extend the sleeve so that the hook of the hooked pull rod of the explosion-proof formwork rod installation and fixing device passes through the plug and is located inside the formwork. Then, activate the first driver to retract the sleeve. Then, use the locking part of the explosion-proof formwork rod installation and fixing device to fix the hooked pull rod and the mounting part. Activate the second driver to press the fixing part against the outside of the formwork. S5: Concrete pouring; S6: After the concrete is poured, release the locking device, then start the retraction of driver one and driver two to extend the hook from the inside of the template. Then separate the shell on one side from the screw, and then pull the screw out from the other side to complete the separation of the explosion-proof template rod installation and fixing device from the template.

2. The method for installing and fixing explosion-proof formwork members according to claim 1, characterized in that: The explosion-proof mold rod installation and fixing device includes: The fixing mechanism includes a screw, a hooked tie rod, a sleeve, and a fixing component. The screw passes through the opening of the template and runs horizontally across both sides of the template. The sleeve is fitted onto the outer contour of the screw, and the outer contour of the sleeve is retractable. The sleeve is coaxially fitted on the outside of the screw rod. After the sleeve passes through the opening of the template, the sleeve can be driven to expand, so that the two ends of the sleeve are respectively pressed against the inner sides of the two templates. The screw rod can slide relative to the axial direction of the sleeve. The hooked tie rod is slidably fitted on the screw rod along the axial direction. The hooked tie rod has a hook part, which is rotatably fitted on the hooked tie rod through an elastic element. The elastic element drives the hook part and the hooked tie rod to form an acute angle. After the sleeve expands, the hooked tie rod passes through the opening and is located inside the sleeve so that its hook part is used to press against the inner side of the template. The fixing element is set on the screw rod to press against the outer side of the template. The mounting mechanism includes a housing, a driver, a sleeve, and a push plate. The housing is connected to the screw. The push plate is slidably fitted onto the sleeve along the axial direction of the screw. The driver is used to drive the push plate to move. The push plate is used to connect with the hooked pull rod.

3. The method for installing and fixing explosion-proof formwork members according to claim 2, characterized in that: A spring is provided between the movable end of the actuator and the push plate, and the spring is used to apply a preload force to the push plate in the direction closer to the actuator.

4. The method for installing and fixing explosion-proof formwork members according to claim 2, characterized in that: A push plate two is provided on the housing in a circumferential sliding fit along the screw. In S3, the push plate two is connected to the fixing member. The driver two is used to drive the push plate two to move so that the fixing member is pressed against the outside of the template.

5. The method for installing and fixing explosion-proof formwork members according to claim 4, characterized in that: The fastener includes a sliding clip with a receiving portion for accommodating a rod. In S4, the second drive causes the sliding clip to move so that the sliding clip and the rod disposed in the receiving portion abut against the outside of the template.

6. The method for installing and fixing explosion-proof formwork members according to claim 2, characterized in that: The casing includes a casing body and an air bladder. The casing body is located outside the air bladder. The plug has an inflation channel. In S4, when the plug seals the opening, the inflation channel is connected to the air bladder. The air bladder can be expanded by the inflation, causing the casing body to expand radially along the screw.

7. The method for installing and fixing explosion-proof formwork members according to claim 6, characterized in that: The plug has a protrusion that matches the diameter of the opening. An inflation channel is located between the plug and the protrusion. When the plug is pressed against the outside of the template, the protrusion extends into the opening and the inflation channel connects with the airbag.

8. The method for installing and fixing explosion-proof formwork members according to claim 2, characterized in that: The hooked tie rod includes a connecting rope and a rod. The connecting rope is wound around a screw. An elastic element is provided at both the connecting rope and the screw. The elastic element is used to apply a pre-tightening force to the connecting rope away from the template. The rod is located at the movable end of the connecting rope, and the hook is located at the end of the rod away from the connecting rope.

9. The method for installing and fixing explosion-proof formwork members according to claim 8, characterized in that: The mounting part is slidably fitted onto the screw, and a limiting element is provided on the mounting part to limit the extension and retraction of the hook-type pull rod.

10. The method for installing and fixing explosion-proof formwork members according to claim 8, characterized in that: The plug has a perforation for the rod to pass through.

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