CN113550567A

CN113550567A - Plastic formwork reinforcing system

Info

Publication number: CN113550567A
Application number: CN202110763656.9A
Authority: CN
Inventors: 廖晟; 韩贺磊; 关旭; 康成哲; 唐松川
Original assignee: Beijing Construction First Construction Engineering Co ltd
Current assignee: Beijing Construction First Construction Engineering Co ltd
Priority date: 2021-07-06
Filing date: 2021-07-06
Publication date: 2021-10-26
Anticipated expiration: 2041-07-06
Also published as: CN113550567B

Abstract

The invention discloses a plastic template reinforcing system which comprises a fixed block, a screw rod, a sleeve, a telescopic rod and a connector arranged on a plastic template, wherein one end of the sleeve is vertically and fixedly connected with the fixed block, the screw rod penetrates through the fixed block and is inserted into the sleeve, the screw rod is in threaded connection with the sleeve, one end of the sleeve, which is far away from the fixed block, is hinged with a conical part which can be opened and closed, a convex block is convexly arranged on the outer side wall of the conical part, the sleeve is in sliding sleeve connection with a snap ring, a threaded sleeve is in threaded connection with the sleeve, one end of the telescopic rod is fixedly connected with the fixed block, and the other end of the telescopic rod is connected with the connector. This application can be taut with the plastic formwork who is located the framework of steel reinforcement both sides in one side, has the efficiency of assembling that improves plastic formwork, reduces the effect of the influence of construction environment to plastic formwork assembly efficiency simultaneously.

Description

Plastic formwork reinforcing system

Technical Field

The invention relates to the technical field of building construction, in particular to a plastic formwork reinforcing system.

Background

The concrete pouring template used for building construction mainly comprises a wood template, a steel template and a plastic template. The surface flatness and the smoothness of the plastic template exceed the technical requirements of the existing fair-faced concrete template, and the plastic template has the functions of flame retardance, corrosion resistance, water resistance and chemical corrosion resistance, and has better mechanical property and electrical insulation property, so the plastic template has a trend.

When the plastic formwork is used as a concrete pouring formwork, the plastic formwork is generally placed on two sides of the steel reinforcement framework, and then the two plastic formworks are tightened by using the split bolts.

However, this kind of form split bolt is in the operation process, need place the location back with fastener and nut fixed at the structure both ends respectively to split bolt, consequently, operating personnel all will operate in framework of steel reinforcement both sides, and the efficiency of construction is low, and in some narrow and small departments in space, the operation is inconvenient. Therefore, there is room for improvement.

Disclosure of Invention

In order to improve the efficiency of assembling of plastic formwork, this application provides a plastic formwork reinforcerment system.

The application provides a plastic formwork reinforcerment system adopts following technical scheme:

the utility model provides a plastic formwork reinforcerment system, includes fixed block, screw rod, sleeve pipe, telescopic link and sets up the connector on plastic formwork, the sheathed tube one end and the perpendicular fixed connection of fixed block, the screw rod pierces through the fixed block and inserts in the sleeve pipe, screw rod and sleeve pipe threaded connection, the one end that the fixed block was kept away from to the sleeve pipe articulates there is the toper portion that can open and shut the setting, the protruding lug that is equipped with of lateral wall of toper portion, the snap ring has been cup jointed in the sleeve pipe slip, threaded connection has the swivel nut on the sleeve pipe, the one end and the fixed block fixed connection of telescopic link, the other end and the connector of telescopic link are connected.

Through adopting above-mentioned technical scheme, during the use, pierce through two plastic formwork with the one end that the sleeve pipe was provided with the toper portion, rotate the screw rod so that the screw rod struts the toper portion. Be connected the one end and the connector of telescopic link, adjust the length of telescopic link so that the telescopic link extension, telescopic link length extension removes in order to promote the fixed block towards the direction of keeping away from plastic formwork, and the fixed block removes and drives sleeve pipe, screw rod and toper portion synchronous movement, and the lug is at the in-process that follows the toper portion and the plastic formwork butt of opposite side to compress tightly the plastic formwork of opposite side in steel reinforcement framework. And then, rotating the screw sleeve to drive the clamping ring to move relative to the sleeve until the clamping ring compresses the plastic template close to the fixed block on the steel bar framework, so that the plastic templates on two sides of the steel bar keel are tensioned. In the process of building the plastic formwork, the plastic formwork located on two sides of the steel bar keel and the steel bar framework are fixed together only by one side, the assembling efficiency of the plastic formwork is greatly improved, and the influence of the construction environment on the assembling efficiency of the plastic formwork is reduced.

Preferably, an isolation pipe is sleeved on the sleeve in a sliding mode and located between the clamping ring and the conical portion.

By adopting the technical scheme, the sleeve can be conveniently pulled out of the formed reinforced concrete wall body in the follow-up process, so that the sleeve can be repeatedly utilized.

Preferably, the conical part includes the polylith fly leaf, every the fly leaf all is articulated with the sleeve pipe torsional spring, every the lateral wall of fly leaf all is equipped with protrudingly the lug.

Through adopting above-mentioned technical scheme, all leave the space that supplies the fly leaf activity between the adjacent fly leaf to make the fly leaf rotate smoothly under the driving of screw rod. Meanwhile, the movable plate is hinged with the sleeve in a damping mode, when a subsequent plastic formwork is demoulded, the screw rod is unscrewed, and the movable plate is reset under the action of the torsion spring, so that the sleeve can be smoothly taken out of the formed wall, and the sleeve can be reused.

Preferably, the telescopic rod comprises an outer tube and an inner rod, the outer tube is in threaded connection with the inner rod, one end of the inner rod is vertically and fixedly connected with the fixing block, and the outer tube is detachably connected with the connector.

Through adopting above-mentioned technical scheme, after outer tube and connector are connected, both become integrative, can adjust the whole length of telescopic link through rotating the outer tube, sleeve pipe and screw rod restriction fixed block rotate to make the fixed block remove along with the length change of telescopic link, and then make the lug taut or loosen plastic formwork. After the wall body is formed, the outer pipe is separated from the connector, the screw sleeve is unscrewed, and then the screw rod is rotated to enable the screw rod to be withdrawn from the conical part, so that the sleeve can be pulled out of the isolation pipe.

Preferably, the connector comprises a base arranged on the plastic template, one side of the base, which is far away from the plastic template, is rotatably clamped with a connecting seat, the connecting seat is provided with a connecting hole for inserting the outer tube, and the connecting seat is provided with a locking component for locking the outer tube and the connecting seat and an unlocking component for unlocking the locking component.

Through adopting above-mentioned technical scheme, after the screw rod struts the toper portion, insert the outer tube in the connecting hole, utilize locking Assembly to lock outer tube and connecting hole for the outer tube can rotate relative plastic formwork. Simultaneously, the connecting seat improves the support to the outer tube to make the outer tube be difficult for droing from the plastic formwork, thereby rotate the outer tube and can drive the fixed block and move towards the direction that is close to or keeps away from the plastic formwork.

Preferably, the locking component comprises an inserting rod, the side wall of the connecting hole is provided with an inserting hole for the inserting rod to insert, an elastic part is fixedly connected between one end of the inserting rod inserted into the inserting hole and the bottom wall of the inserting hole, and the side wall of the outer tube is provided with a through hole for the inserting rod to insert.

Through adopting above-mentioned technical scheme, when needing to insert the outer tube in the connecting hole, press the inserted bar so that the inserted bar inserts in the jack, insert the outer tube in the connecting hole, rotate the outer tube, when the through-hole on the outer tube just is to the jack, the jack passes the through-hole automatically under the effect of elastic component to with outer tube and connecting seat locking.

Preferably, the unlocking piece comprises a shifting rod, one end of the shifting rod is vertically and fixedly connected with the insertion rod, a sliding groove for the shifting rod to slide is formed in the connecting seat, the sliding groove is communicated with the insertion hole, and the sliding groove is formed in the length direction of the insertion rod.

Through adopting above-mentioned technical scheme, when needing to extract the outer tube from the connecting seat in, stir the driving lever and remove until the inserted bar inserts in the jack in order to drive the inserted bar, can extract the outer tube from the connecting hole.

Preferably, still include the connecting strip, the snap ring is kept away from one side of swivel nut and is sunken to have the draw-in groove, connecting strip and draw-in groove activity joint.

Through adopting above-mentioned technical scheme, when the snap ring will soon with the plastic formwork butt, peg graft the connecting strip between two adjacent snap rings that lie in same one side through the draw-in groove, screw up the swivel nut again, until connecting strip and plastic formwork butt, the connecting strip plays the supporting role to plastic formwork, make the plastic formwork atress even, thereby make plastic formwork difficult local deformation under the impact of concrete, be favorable to improving the roughness behind the wall shaping, simultaneously, also be favorable to plastic formwork recycle.

Preferably, the inner ring surface of the clamping ring is convexly provided with a guide block, the outer peripheral surface of the sleeve is provided with a guide groove along the length direction of the sleeve, and the guide block is in sliding insertion connection with the guide groove.

Through adopting above-mentioned technical scheme, the guide block cooperation guide way plays the guide effect to the snap ring to make the snap ring can not sleeve pipe rotation relatively, thereby be favorable to installing the connecting strip.

Preferably, the equal fixedly connected with sealing strip of plastic formwork's side, the thickness of sealing strip is the half of plastic formwork thickness, the sealing strip levels the transition with plastic formwork, adjacent two the sealing strip dislocation set, the both ends of sealing strip bulge the relative a pair of side setting of sealing strip respectively, the both ends of sealing strip all are isosceles right triangle and set up.

Through adopting above-mentioned technical scheme, when the concatenation plastic formwork, will be located the range upon range of concatenation of two sealing strips on two adjacent edges of plastic formwork, strengthened the leakproofness of the junction of two plastic formwork to make concrete plastic formwork be difficult to spill from plastic formwork's concatenation seam, when saving concrete raw materials, be favorable to later stage plastic formwork drawing of patterns.

In summary, the present application includes at least one of the following beneficial technical effects:

1. when the plastic formwork splicing device is used, the conical part can be opened by rotating the screw rod on one side, then the length of the telescopic rod is adjusted to enable the telescopic rod to extend to drive the protrusion to tightly abut against the plastic formwork on the other side to the steel bar keel, and then the screw sleeve is screwed down to tightly abut against the plastic formwork close to the fixed block and the steel bar keel, so that the whole operation process is simple and convenient, the plastic formwork splicing efficiency is improved, and the influence of a construction environment on the plastic formwork splicing efficiency is favorably reduced;

2. the isolation pipe is sleeved on the sleeve in a sliding manner, so that the sleeve can be conveniently pulled out of the formed wall body in the follow-up process, and the sleeve can be conveniently recycled;

3. the connecting strip is inserted between two adjacent clamping rings located on the same side, the screw sleeves are screwed down, and the connecting strip plays a supporting role in the plastic formwork, so that the plastic formwork is not prone to local deformation under the impact of concrete, the improvement of the flatness of the wall surface after forming is facilitated, and meanwhile, the plastic formwork is also facilitated to be recycled.

Drawings

FIG. 1 is a schematic view of the overall structure of the plastic formwork of the present application after being assembled;

FIG. 2 is a schematic structural view of two plastic forms of the present application when pulled in opposite directions;

FIG. 3 is a schematic view of the internal structure of the spacer tube and sleeve of the present application;

FIG. 4 is a schematic view of the snap ring separated from the sleeve in the present application;

FIG. 5 is a schematic view of the telescopic rod of the present application after being connected to the connector;

fig. 6 is a schematic view of the internal structure of the connector holder of the present application.

Description of reference numerals:

1. a fixed block; 2. a screw; 3. a sleeve; 4. a tapered portion; 41. a movable plate; 42. a bump; 5. a telescopic rod; 51. an inner rod; 52. an outer tube; 6. a connector; 61. a base; 62. a connecting seat; 63. a locking assembly; 631. inserting a rod; 632. a spring; 633. a jack; 64. a slot; 65. a convex ring; 66. a ring groove; 67. connecting holes; 68. a deflector rod; 69. a chute; 7. a connecting strip; 8. a plastic template; 9. a sealing strip; 10. a snap ring; 11. a threaded sleeve; 12. a card slot; 13. a guide block; 14. a guide groove; 15. a through hole; 16. a handle; 17. and (4) isolating the pipe.

Detailed Description

The present application is described in further detail below with reference to figures 1-6.

The embodiment of the application discloses plastic formwork reinforcerment system. Referring to fig. 1 and 2, the device comprises a fixing block 1, a screw rod 2, a sleeve 3, a conical part 4, a telescopic rod 5, an isolation pipe 17, a connector 6 arranged on a plastic formwork 8 and a connecting strip 7. Four sides of plastic formwork 8 are all protruding to be equipped with sealing strip 9, and the both ends of sealing strip 9 are respectively salient the relative a pair of side setting of sealing strip 9, and the both ends of sealing strip 9 all are isosceles right triangle and set up. The joint surface of the sealing strip 9 and the plastic template 8 is in smooth transition, the thickness of the sealing strip 9 is half of that of the plastic template 8, and the two sealing strips 9 positioned on the adjacent edges of the plastic template 8 are arranged in a staggered mode. Through setting up sealing strip 9, strengthened the leakproofness of joint seam department after the concatenation of plastic formwork 8 to the condition of leaking is difficult for appearing.

Referring to fig. 2 and 3, one end of the sleeve 3 is vertically and fixedly connected with the fixing block 1, the sleeve 3 is sleeved with a snap ring 10 in a sliding manner, the sleeve 3 is connected with a threaded sleeve 11 in a threaded manner, and the fixing thread is located between the fixing block 1 and the snap ring 10. And a clamping groove 12 for inserting the connecting strip 7 is formed in one side of the clamping ring 10, which is far away from the threaded sleeve 11. The spacer pipe 17 slides and cup joints in the periphery of sleeve pipe 3, through setting up spacer pipe 17, makes things convenient for the later stage to dismantle sleeve pipe 3. The conical part 4 is hinged at one end of the sleeve 3 far away from the fixing block 1, and the conical part 4 can be opened and closed. One end of the screw rod 2 is arranged in a conical manner, one end of the screw rod 2 arranged in a conical manner penetrates through the fixing block 1 and is inserted into the sleeve 3, the screw rod 2 is in threaded connection with the fixing block 1, the screw rod 2 is in threaded connection with the sleeve 3, and the other end of the screw rod 2 is vertically and fixedly connected with the handle 16 so as to rotate the screw rod 2. One end and the fixed block 1 fixed connection of telescopic link 5, the other end and the connector 6 of telescopic link 5 can be dismantled and be connected.

Referring to fig. 3, the tapered portion 4 includes two opposite movable plates 41, the two movable plates 41 enclose to form a hollow cone, the large end of the movable plate 41 is hinged to the sleeve 3 far away from the fixed block 1 by a torsion spring, and a protrusion 42 is integrally formed on one side of the two movable plates 41 facing away from each other. When the two movable plates 41 are closed, the projection of the lug 42 on the sleeve 3 is positioned in the sleeve 3; when the two movable plates 41 are completely opened under the extrusion of the screw 2, the projection of the lug 42 on the sleeve 3 is positioned outside the sleeve 3.

When the concrete pouring platform is built, the plastic formworks 8 are divided into two groups and are respectively placed on two sides of the steel reinforcement framework, and the sleeve 3 sleeved with the isolation pipe 17 penetrates through the two plastic formworks 8. Rotate screw rod 2 until screw rod 2 struts two fly leaf 41, be connected the one end of telescopic link 5 with connector 6 on the plastic formwork 8, adjust the length of telescopic link 5 so that the length extension of telescopic link 5, fixed block 1 moves and drives sleeve pipe 3 and screw rod 2 and fly leaf 41 synchronous motion towards the direction of keeping away from plastic formwork 8, lug 42 is following the in-process that fly leaf 41 removed and the plastic formwork 8 butt of opposite side to support the plastic formwork 8 of opposite side tightly in steel reinforcement cage. The threaded sleeve 11 is screwed down to push the clamping ring 10 and the connecting strip 7 to move towards the direction close to the plastic formwork 8 until the connecting strip 7, the clamping ring 10 and the plastic formwork 8 are abutted tightly, and therefore the two opposite plastic formworks 8 and the steel reinforcement framework are locked.

Referring to fig. 4, two guide blocks 13 are further convexly arranged on the inner annular surface of the snap ring 10, a guide groove 14 for inserting the guide blocks 13 is recessed in the outer circumferential surface of the sleeve 3, the guide groove 14 is formed along the length direction of the sleeve 3, and the guide blocks 13 are slidably inserted into the guide groove 14. Since the connecting bar 7 is disposed between the two snap rings 10 on the two adjacent sleeves 3 to support the plastic formwork 8, the guide block 13 cooperates with the guide groove 14 to limit the rotation of the snap rings 10 by providing the guide block 13 and the guide groove 14, so as to install the connecting bar 7.

Referring to fig. 3, the telescopic rod 5 includes an inner rod 51 and an outer tube 52, the inner rod 51 is provided with an external thread, the outer tube 52 is provided with an internal thread, and the outer tube 52 is in threaded connection with the inner rod 51. One end of the inner rod 51 far away from the outer tube 52 is fixedly connected with the fixed block 1, and one end of the outer tube 52 far away from the inner rod 51 is detachably connected with the connector 6.

Referring to fig. 5 and 6, the connector 6 includes a base 61 fixed to the plastic formwork 8, a coupling seat 62 rotatably coupled to the base 61, a locking assembly 63 for locking the outer tube 52 to the coupling seat 62, and an unlocking member for unlocking the locking assembly 63. The connecting seat 62 is arranged in a circular shape, one side of the base 61 is provided with a slot 64 for the connecting seat 62 to be inserted into, and the connecting seat 62 is rotatably inserted into the slot 64; the outer peripheral surface of connecting seat 62 is equipped with bulge loop 65 in the protruding, and the groove side wall recess of slot 64 has annular groove 66, and bulge loop 65 rotates with annular groove 66 and is connected. The connecting base 62 is provided with a connecting hole 67 into which the outer tube 52 is inserted, and the hole side wall of the connecting hole 67 is provided with an insertion hole 633.

Referring to fig. 6, the locking assembly 63 includes an insertion rod 631 inserted into the insertion hole 633, and an elastic member is fixedly connected between one end of the insertion rod 631 inserted into the insertion hole 633 and a groove bottom of the groove, where the elastic member is a spring 632. The outer tube 52 is provided with a through hole 15 for inserting the insertion rod 631, and when the outer tube 52 is inserted into the connection hole 67, the axis of the through hole 15 and the axis of the insertion rod 631 are located in the same plane.

Referring to fig. 6, the unlocking member is a shift lever 68, one end of the shift lever 68 is vertically and fixedly connected with the insertion rod 631, and the other end of the shift lever 68 penetrates through the end surface of the connecting base 62 with the connecting hole 67. The connecting base 62 is provided with a sliding groove 69 for the shift lever 68 to slide, the sliding groove 69 is arranged along the length direction of the inserting rod 631, and the sliding groove 69 is communicated with the connecting hole 67 and the inserting hole 633.

The implementation principle of the plastic formwork reinforcing system in the embodiment of the application is as follows:

when the concrete pouring platform is built, the plastic formworks 8 are divided into two groups and are respectively placed on two sides of the steel reinforcement framework. The sleeve 3 is sleeved with the rear isolation pipe 17 and then sequentially penetrates through the two plastic templates 8, and then the screw 2 is rotated to extrude the movable plates 41 until the two movable plates 41 are completely opened.

The rod 631 is inserted into the hole 633 by pulling the lever 68, and the spring 632 is compressed. The outer tube 52 is inserted into the connecting hole 67, the outer tube 52 is rotated, when the through hole 15 of the outer tube 52 is rotated to face the plunger 631, the spring 632 rebounds to push the plunger 631 to pass through the through hole 15, and the outer tube 52 is locked with the connecting seat 62. The outer pipe 52 is continuously rotated to enable the whole length of the telescopic rod 5 to be lengthened, so that the fixing block 1 moves towards the direction far away from the plastic formwork 8, the fixing block 1 moves to drive the screw rod 2, the sleeve 3 and the movable plate 41 to move synchronously, and the lug 42 abuts against the plastic formwork 8 on the other side in the process of moving along with the movable plate 41, so that the plastic formwork 8 on the other side is abutted against the steel reinforcement framework.

Then, screw up swivel nut 11 and move towards the direction that is close to plastic formwork 8 with driving snap ring 10, when snap ring 10 closes on plastic formwork 8, peg graft connecting strip 7 between two adjacent snap rings 10 that lie in same one side, continue to screw up swivel nut 11 until connecting strip 7, snap ring 10 and plastic formwork 8 butt to it is taut with two plastic formwork 8. In the process of building the concrete pouring platform, constructors can tighten the plastic templates 8 on two sides of the steel bar framework only by one side, so that the working efficiency is greatly improved, and the influence of the construction environment on the assembly efficiency of the plastic templates 8 is reduced.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a plastic formwork reinforcerment system which characterized in that: including fixed block (1), screw rod (2), sleeve pipe (3), telescopic link (5) and connector (6) of setting on plastic formwork (8), the one end and the perpendicular fixed connection of fixed block (1) of sleeve pipe (3), screw rod (2) pierce through fixed block (1) and insert in sleeve pipe (3), screw rod (2) and sleeve pipe (3) threaded connection, the one end that fixed block (1) was kept away from in sleeve pipe (3) articulates there is toper portion (4) that can open and shut the setting, the lateral wall of toper portion (4) is protruding to be equipped with lug (42), snap ring (10) have been cup jointed in sleeve pipe (3) slip, threaded connection has swivel nut (11) on sleeve pipe (3), the one end and fixed block (1) fixed connection of telescopic link (5), the other end and the connector (6) of telescopic link (5) are connected.

2. The plastic formwork reinforcement system of claim 1, wherein: an isolation pipe (17) is sleeved on the sleeve (3) in a sliding mode, and the isolation pipe (17) is located between the clamping ring (10) and the conical portion (4).

3. The plastic formwork reinforcement system of claim 2, wherein: the conical part (4) comprises a plurality of movable plates (41), each movable plate (41) is hinged to the sleeve (3) through a torsion spring, and the outer side wall of each movable plate (41) is provided with the lug (42) in a protruding mode.

4. The plastic formwork reinforcement system of claim 2, wherein: the telescopic rod (5) comprises an outer tube (52) and an inner rod (51), the outer tube (52) is in threaded connection with the inner rod (51), one end of the inner rod (51) is perpendicularly and fixedly connected with the fixing block (1), and the outer tube (52) is detachably connected with the connector (6).

5. The plastic formwork reinforcement system of claim 4, wherein: connector (6) are including setting up base (61) on plastic formwork (8), the joint is rotated to one side that plastic formwork (8) were kept away from in base (61) has connecting seat (62), offer on connecting seat (62) and supply outer tube (52) male connecting hole (67), be provided with on connecting seat (62) and be used for locking outer tube (52) and connecting seat (62) locking subassembly (63) and the unlocking piece that is used for unblock locking subassembly (63).

6. The plastic formwork reinforcement system of claim 5, wherein: locking Assembly (63) includes inserted bar (631), the lateral wall of connecting hole (67) is opened has and supplies inserted jack (633) of inserted bar (631), fixedly connected with elastic component between the one end that inserted bar (631) inserted jack (633) and the diapire of jack (633), the lateral wall of outer tube (52) is opened has the confession inserted through-hole (15) of inserted bar (631).

7. The plastic formwork reinforcement system of claim 6, wherein: the unlocking piece comprises a shifting rod (68), one end of the shifting rod (68) is vertically and fixedly connected with an inserting rod (631), a sliding groove (69) for the shifting rod (68) to slide is formed in the connecting seat (62), the sliding groove (69) is communicated with the inserting hole (633), and the sliding groove (69) is formed in the length direction of the inserting rod (631).

8. The plastic formwork reinforcement system of claim 1, wherein: still include connecting strip (7), one side that swivel nut (11) was kept away from in snap ring (10) is sunken to have draw-in groove (12), connecting strip (7) and draw-in groove (12) activity joint.

9. The plastic formwork reinforcement system of claim 8, wherein: the inner ring surface of the clamping ring (10) is convexly provided with a guide block (13), the outer peripheral surface of the sleeve (3) is provided with a guide groove (14) along the length direction of the sleeve, and the guide block (13) is in sliding insertion connection with the guide groove (14).

10. The plastic formwork reinforcement system of claim 1, wherein: the equal fixedly connected with sealing strip (9) of side of plastic formwork (8), the thickness of sealing strip (9) is the half of plastic formwork (8) thickness, sealing strip (9) and plastic formwork (8) level and smooth transition, adjacent two sealing strip (9) dislocation set, the both ends of sealing strip (9) bulge the relative a pair of side setting of sealing strip (9) respectively, the both ends of sealing strip (9) all are isosceles right triangle and set up.