CN115339117A

CN115339117A - Steel strip reinforced spiral corrugated pipe heat shrinkable sleeve connecting structure and construction method thereof

Info

Publication number: CN115339117A
Application number: CN202211010335.2A
Authority: CN
Inventors: 颜田田; 姚渡东来; 唐娟
Original assignee: Hubei Jintianyu Construction Engineering Co ltd
Current assignee: Hubei Jintianyu Construction Engineering Co ltd
Priority date: 2022-08-23
Filing date: 2022-08-23
Publication date: 2022-11-15

Abstract

The application relates to the field of corrugated pipe butt joint methods, and particularly discloses a steel strip reinforced spiral corrugated pipe heat shrinkable sleeve connecting structure and a construction method thereof, wherein the method comprises the following steps: s1, pipe aligning; s2, polishing; s3, sleeving the heat-shrinkable tube at the butt joint end of one corrugated tube in a penetrating manner by using a sleeve, and pulling the heat-shrinkable tube to be far away from the butt joint end; s4, fixing; s5, baking, namely positioning the end part of the heat-shrinkable tube through a coaxial positioning device to enable the heat-shrinkable tube to be coaxial with the corrugated tube, then heating the heat-shrinkable tube in an annular manner, slowly moving the heat-shrinkable tube along the axial direction of the heat-shrinkable tube, and driving the coaxial positioning device to gradually withdraw from the heat-shrinkable tube when moving and heating towards the end part of the heat-shrinkable tube; s6, closing up, namely keeping the coaxial positioning device to position the heat shrinkable tube when the heat shrinkable tube is heated to the end part of the heat shrinkable tube, heating the inner side wall of the end part of the heat shrinkable tube, and then turning to the outer side wall of the heat shrinkable tube for heating; and S7, sealing. The corrugated pipe has the advantages of good circumferential shrinkage consistency of the heat-shrinkable pipe, high fitting degree with the corrugated pipe and strong sealing performance.

Description

Steel strip reinforced spiral corrugated pipe heat shrinkable sleeve connecting structure and construction method thereof

Technical Field

The application relates to the field of corrugated pipe butt joint methods, in particular to a steel strip reinforced spiral corrugated pipe heat shrinkable sleeve connecting structure and a construction method thereof.

Background

The steel strip reinforced spiral corrugated pipe is a double-wall spiral corrugated pipe which takes high-density Polyethylene (PE) as a substrate, takes a steel strip with the surface coated with adhesive resin as a waveform as a main supporting structure, and is wound and compounded with a polyethylene material into a whole. The hot-melt strip-type corrugated pipe butt joint device is mainly applied to drainage pipelines in water conservancy, municipal engineering and other projects, usually, a plurality of sections of corrugated pipes are sequentially butted to form a complete drainage channel in actual construction, the structure of the corrugated pipes is limited, the corrugated pipes can be butted only in several modes of hot-melt strip extrusion welding connection, clamp connection and hot-shrink pipe connection, and the hot-shrink pipe connection with high sealing performance is taken as a main butt joint mode.

However, when the thermal contraction sleeve is used to seal and connect the butt joint portions of two corrugated pipes, because the inner diameter of the thermal contraction sleeve is far larger than the outer diameter of the corrugated pipe, when a constructor heats the thermal contraction sleeve through a spray gun so that the thermal contraction sleeve is attached to the wave crests and the wave troughs of the corrugated pipe, the constructor needs to heat the thermal contraction sleeve in the circumferential direction and then uniformly diffuse the thermal contraction sleeve in the axial direction, and needs to accurately control the fire power for heating the thermal contraction sleeve so as to prevent the phenomenon that the wave crests and the wave troughs of the corrugated pipe cannot be effectively attached to the bubble or the wrinkle generated during the contraction of the thermal contraction sleeve, and the thermal contraction sleeve cannot be maintained in the coaxial state of the corrugated pipe when the thermal contraction sleeve is heated in the heating process, so that the wrinkle generated during the thermal contraction of the search sleeve can cause uncontrollable construction quality.

Disclosure of Invention

In order to solve the problem that the joint quality of a heat shrinkable sleeve and a corrugated pipe is poor due to shrinkage wrinkles and the like caused by the fact that the heat shrinkable sleeve cannot always keep the coaxiality with the corrugated pipe when the heat shrinkable sleeve is heated, the application provides a steel strip reinforced spiral corrugated pipe heat shrinkable sleeve connecting structure and a construction method thereof.

The construction method of the steel strip reinforced spiral corrugated pipe heat shrinkable sleeve connecting structure provided by the first aspect of the application adopts the following technical scheme:

a construction method of a steel strip reinforced spiral corrugated pipe heat shrinkable sleeve connecting structure comprises the following steps:

s1, making a pair of tubes, erecting two corrugated tubes to be butted, and detecting and finishing the flatness of butted end faces of the corrugated tubes;

s2, polishing, namely polishing the outer wall of the butt joint end of the corrugated pipe, wherein a polishing area at least extends for 120mm along the axial direction of the corrugated pipe, and cleaning is needed after polishing is finished;

s3, sleeving a heat-shrinkable tube at the butt joint end of one corrugated tube in a penetrating manner by using a sleeve, and pulling the heat-shrinkable tube to be far away from the butt joint end;

s4, fixing, namely aligning and tightly abutting the two corrugated pipes in the middle and fixing the two corrugated pipes; then drawing the heat shrinkable tube to a polished area covering the two corrugated tubes;

s5, baking, namely positioning the end part of the heat shrinkable tube through a coaxial positioning device to enable the heat shrinkable tube to be coaxial with the corrugated tube, then heating the heat shrinkable tube in an annular manner, moving the heat shrinkable tube slowly along the axial direction of the heat shrinkable tube, and driving the coaxial positioning device to gradually withdraw from the heat shrinkable tube when moving and heating towards the end part of the heat shrinkable tube;

s6, closing up, keeping the coaxial positioning device to position the heat shrinkable tube when the heat shrinkable tube is heated to the end part of the heat shrinkable tube, heating the inner side wall of the end part of the heat shrinkable tube, and then turning to the outer side wall of the heat shrinkable tube for heating;

and S7, sealing, after the heat shrinkable tube is attached, uniformly heating the heat shrinkable tube by using a low-temperature fire until hot melt adhesive overflows from the end part of the heat shrinkable tube, and naturally cooling.

Through adopting above-mentioned technical scheme, in the in-process that heats the pyrocondensation pipe and toast, fix a position the both ends of pyrocondensation pipe through coaxial positioner in advance, can make the pyrocondensation portion of pyrocondensation pipe remain coaxial state with the bellows throughout, and along with the gradual outdiffusion of pyrocondensation portion of pyrocondensation pipe, coaxial positioner also withdraws from gradually in the gap between pyrocondensation pipe and the bellows, can make the pyrocondensation pipe keep shrinking and cladding on the bellows with the coaxial state of bellows throughout the in-process of heating, the shrinkage that the pyrocondensation pipe corresponds each department of bellows circumference is close like this, can ensure the good laminating effect of pyrocondensation pipe and bellows, avoided the pyrocondensation pipe fold and leaded to the phenomenon that the leakproofness is not strong in bellows joint department to take place. And because when heating to the pyrocondensation pipe tip, heat pyrocondensation pipe tip inner wall earlier, turn to the lateral wall heating again, can make the higher also more even of hot melt adhesive softening degree on the pyrocondensation pipe tip, and then can make pyrocondensation pipe tip can form very inseparable firm connection with the bellows, improve the joint strength and the sealing performance of pyrocondensation pipe and bellows.

Optionally, the manner of fixing the two corrugated pipes in step S4 is as follows:

and attaching a PE welding rod around the circumference of the butt joint of the two corrugated pipes, and heating the PE welding rod to fix the two corrugated pipes.

Through adopting above-mentioned technical scheme, can carry out preliminary welding, fixed to two bellows after the multiple spot welding PE welding rod, be favorable to subsequent pyrocondensation cladding laminating effect of pyrocondensation pipe to can improve the anti buckling strength of axial of two bellows butt joints to a certain extent, thereby improve the durability after the bellows butt joint.

Optionally, in step S4, after the two corrugated pipes are fixed, the butt ends of the corrugated pipes are preheated to 40 to 50 ℃, a heat-shrinkable tape is wound around the butt joint of the two corrugated pipes for more than one week, and then the heat-shrinkable tape is heated to attach the heat-shrinkable tape to the corrugated pipes.

By adopting the technical scheme, the heating corrugated pipe is wound by the thermal contraction belt to effectively seal the joint of the two fixed corrugated pipes, so that the sealing and waterproof effects of the joint of the two corrugated pipes are improved, and compared with the conventional hoop connection, the pressure resistance and the durability are stronger.

Optionally, the coaxial positioning device in step S5 includes a bottom plate, two first sliding seats slidably disposed on the bottom plate, two first arc plates having inner arc sides disposed opposite to each other are hinged to the first sliding seats, and a locking mechanism for locking the two first arc plates is disposed between free ends of the two first arc plates on the same first sliding seat;

the first arc board is close to and is not connected with it a plurality of bracing pieces are installed to one side of first slide, the bracing piece free end is provided with the locating plate that the slope set up, the locating plate is located the bracing piece deviates from one side in first arc board axle center, the locating plate with contained angle between the bracing piece is the acute angle.

By adopting the technical scheme, when the heat-shrinkable tube is to be heated, firstly sliding the two first sliding seats to divide the two ends of the heat-shrinkable tube, then overturning the two first arc plates and locking the two corresponding first arc plates through the locking mechanism, wherein the two first arc plates are encircled on the periphery of the heat-shrinkable tube; promote first slide again for bracing piece and locating plate on the first cambered plate insert between pyrocondensation pipe and the bellows, the locating plate that a plurality of slopes set up this moment opens the pyrocondensation pipe jointly, can make the pyrocondensation pipe keep with the coaxial state of bellows, thereby when heating the pyrocondensation pipe, only need progressively to heat the pyrocondensation pipe and progressively slide first slide again and make the locating plate progressively withdraw from the pyrocondensation pipe, alright realize that the pyrocondensation pipe corresponds the everywhere shrinkage of bellows circumference in pyrocondensation process and is close, can ensure the good laminating effect of pyrocondensation pipe and bellows.

Optionally, the positioning plate is an arc-shaped plate, and the inner arc surface of the positioning plate is close to the supporting rod.

By adopting the technical scheme, the supported surface of the heat shrinkable tube is more gentle when the heat shrinkable tube is supported by the plurality of positioning plates, and excessive deformation cannot occur.

Optionally, in step S5, the heat shrinkable tube is heated circumferentially by a circumferential heating device, the circumferential heating device includes a second slide seat which is slidably disposed on the bottom plate and located between the two first slide seats, the second slide seat is hinged with two second arc plates whose inner arc sides are oppositely disposed, a semicircular ring is slidably disposed on the second arc plate along an arc profile thereof, and a locking mechanism for locking end portions of the two semicircular rings is disposed between adjacent end portions of the two semicircular rings;

the gas pipe is arranged on the semicircular ring, a plurality of spray gun nozzles pointing to the axes of the spray gun nozzles are arranged on the semicircular ring, a flexible gas pipe is connected to each spray gun nozzle, and one end of each gas pipe, far away from each spray gun nozzle, is communicated with a gas source.

By adopting the technical scheme, when the heat shrinkable tube is heated and baked, the two second arc plates are turned over, and the two semicircular rings are locked by the locking mechanism; and then, a plurality of flexible air pipes are communicated with an air source, and combustible gas at the outlet of the spray gun nozzle is ignited, the flame sprayed by the spray gun nozzles on the two semicircular rings can bake the heat-shrinkable pipe in the circumferential direction, and the spray gun nozzles can be driven to axially move along the corrugated pipe to bake when the second sliding seat is moved. And with the help of the sliding connection of semicircle ring and second arc board, can wind two locked semicircle rings of bellows axial reciprocating rotation on the second arc board, in order to realize the hoop even heating of a plurality of spray gun mouths to the pyrocondensation pipe, compare in the handheld spray gun heating of constructor, the construction method of this application is more even to the heating of pyrocondensation pipe, the uniformity of pyrocondensation pipe shrink is high, and can not rely on constructor's construction experience too much, the operation degree of difficulty is lower, more do benefit to and promote at the job site.

Optionally, the second slide is fixedly connected with a push rod pointing to the first slide, and when the free end of the push rod is abutted against the first slide, the nozzle of the spray gun is close to one end, closest to the support rod, of the positioning plate.

By adopting the technical scheme, when the second sliding seat drives the spray gun nozzles on the second sliding seat to axially move along the corrugated pipe and bake, the push rod on the second sliding seat pushes the first sliding seat to synchronously move, so that the positioning plates on the first sliding seat synchronously withdraw from the heat shrink pipe for a certain distance without the need of manually withdrawing the positioning plates by constructors; and in actual construction, in order to ensure the high-quality attaching effect of the heat shrinkable tube, the nozzle gun can be moved back along the axial direction of the corrugated tube, and at the moment, the first sliding seat cannot move back to the butt joint of the two corrugated tubes along with the second sliding seat, so that the heat shrinkable tube attached to the corrugated tubes cannot be damaged, and the construction method of the application is more in line with actual construction.

Optionally, the positioning plate is hinged to the support rod, one end of the positioning plate, which is farthest from the support rod, is hinged to an inclined strut, one end of the support rod, which is close to the first arc plate, is provided with a chute arranged along the length direction of the support rod, and one end of the inclined strut, which is close to the support rod, is provided with a sliding head slidably arranged in the chute;

in an initial state, the inclined supporting rod inclines towards a direction departing from the first arc plate, and an included angle between the inclined supporting rod and the supporting rod is an acute angle.

Through adopting above-mentioned technical scheme, the locating plate articulates on the bracing piece to gliding position is different in the spout on the bracing piece through the slippery fellow, can adjust the inclination of locating plate and bracing piece, and then can make a plurality of locating plates can carry out effectual coaxial positioning support to not unidimensional pyrocondensation pipe.

Optionally, a control frame is installed on the bottom plate, a plurality of control rods corresponding to the plurality of diagonal braces one to one are fixedly connected to one side of the control frame close to the positioning plate, and the control rods point to the diagonal braces.

By adopting the technical scheme, when the step S6 is carried out, the control frame is arranged at a proper position on the bottom plate, when the first sliding seat slides to the position plate and is close to and separated from the end part of the heat shrinkable tube, the inclined stay bar hinged on the position plate abuts against the control rod and slides along with the first sliding seat towards the direction close to the control frame, the inclined stay bar drives the sliding head to approach towards the direction close to the hinged part of the position plate and the support rod in the sliding groove under the abutting and pushing action of the control rod, so that the included angle between the position plate and the support rod is increased, the end part of the heat shrinkable tube can be expanded and expanded, and the inner wall of the heat shrinkable tube can be baked by virtue of a handheld spray gun at the moment without worrying about the direct collapse of the heat shrinkable tube; after the inner wall at the end part of the heat-shrinkable tube is baked, the positioning plate and the supporting rod are withdrawn completely, the end part of the heat-shrinkable tube still can keep the coaxiality better than that of the corrugated tube, the circumferential shrinkage uniformity of the heat-shrinkable tube is good, and therefore the high-quality necking-in effect of the end part of the heat-shrinkable tube can be ensured.

The steel band reinforced spiral corrugated pipe heat shrinkable sleeve connecting structure provided by the second aspect of the application is formed by the construction method of the steel band reinforced spiral corrugated pipe heat shrinkable sleeve connecting structure, and the following technical scheme is adopted:

a steel strip reinforced spiral corrugated pipe heat shrink sleeve connecting structure comprises a plurality of PE welding rods welded at the joint of two corrugated pipes and a heat shrink belt coated outside the PE welding rods, wherein the heat shrink belt is further coated with a heat shrink pipe in a heat shrink manner, and the heat shrink pipe covers the two corrugated pipes and has at least three half-wave lengths.

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

1. in the process of heating and baking the heat shrinkable tube, the two ends of the heat shrinkable tube are positioned in advance through the coaxial positioning device, the non-heat-shrinkable part of the heat shrinkable tube can be always in a coaxial state with the corrugated tube, and gradually diffuses outwards along with the heat-shrinkable part of the heat shrinkable tube, the coaxial positioning device also gradually exits from a gap between the heat shrinkable tube and the corrugated tube, the heat shrinkable tube can be always kept in a coaxial state with the corrugated tube in the heating process and is shrunk and coated on the corrugated tube, so that the shrinkage of the heat shrinkable tube corresponding to each circumferential part of the corrugated tube is close, the good laminating effect of the heat shrinkable tube and the corrugated tube can be ensured, and the phenomenon that the sealing performance of a joint of the corrugated tube is not strong due to the folds of the heat shrinkable tube is avoided;

2. when the heat shrinkable tube is heated and baked, the two locked semicircular rings can be axially and reciprocally rotated on the second arc plate around the corrugated tube by virtue of the sliding connection between the semicircular rings and the second arc plate, so that the plurality of spray gun nozzles can uniformly heat the heat shrinkable tube in the annular direction, and the plurality of spray gun nozzles can be driven to axially move along the corrugated tube for baking when the second sliding seat is moved; compared with the method that the spray gun is held by a constructor to heat, the construction method has the advantages that the heat shrinkable tube is heated more uniformly, the shrinkage consistency of the heat shrinkable tube is high, the construction experience of the constructor is not excessively depended on, the operation difficulty is lower, and the popularization in a construction site is facilitated;

3. when the second sliding seat drives the spray gun nozzles to axially move along the corrugated pipe and bake, the push rod on the second sliding seat pushes the first sliding seat to synchronously move, so that the positioning plates on the first sliding seat synchronously withdraw from the heat shrink pipe for a certain distance, and a constructor does not need to manually withdraw the positioning plates, so that the operation is simpler and more convenient;

4. when the end part of the heat shrinkable tube is closed, the first sliding seat slides to the position plate to be close to and separated from the end part of the heat shrinkable tube, the inclined stay rod hinged to the position plate is abutted against the control rod and slides along with the first sliding seat continuously towards the direction close to the control frame, the inclined stay rod is overturned under the abutting action of the control rod to increase the included angle between the position plate and the support rod, so that the end part of the heat shrinkable tube can be expanded and expanded, at the moment, the inner wall of the heat shrinkable tube can be baked by virtue of a handheld spray gun, and the worry that the heat shrinkable tube directly collapses is avoided; after the inner wall at the end part of the heat-shrinkable tube is baked, the positioning plate and the supporting rod are withdrawn completely, the end part of the heat-shrinkable tube still can keep the coaxiality better than that of the corrugated tube, the circumferential shrinkage uniformity of the heat-shrinkable tube is good, and therefore the high-quality necking-in effect of the end part of the heat-shrinkable tube can be ensured.

Drawings

Fig. 1 is a schematic view of the overall structure of the coaxial positioning device and the annular heating device in the construction method according to the embodiment of the present application.

Fig. 2 is a schematic structural diagram of a coaxial positioning device, a control frame and a control rod in the construction method according to the embodiment of the application.

Fig. 3 is an enlarged schematic view of a portion a in fig. 1.

Fig. 4 is a schematic cross-sectional view of a connection structure according to an embodiment of the present application.

Fig. 5 is an enlarged schematic view of a portion B in fig. 4.

Reference numerals are as follows:

11. a bellows; 12. heat shrink tubing; 13. PE welding rods; 14. a heat shrinkable tape;

2. a base plate;

31. a first slider; 32. a first arc plate; 33. a support bar; 34. positioning a plate; 35. a diagonal brace; 36. a chute; 37. sliding the head;

41. a second slide carriage; 42. a second arc plate; 43. a semicircular ring; 44. a spray gun nozzle; 46. a push rod; 47; a sleeve; 48. fixing the bolt;

51. a control frame; 52. a control lever;

61. a column; 62. a slide rail; 63. a locking bolt; 64. a handle; 65. a support bracket;

71. a hasp; 72. setting up a seat; 73. a magnet; 74. sinking a groove; 75. and (4) locking pins.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

The embodiment of the application discloses a construction method of a steel strip reinforced spiral corrugated pipe 11 heat shrinkable sleeve connecting structure. Referring to fig. 1, the construction method of the steel strip reinforced helical bellows 11 heat shrinkable sleeve connection structure includes the following steps:

s1, making a pair of tubes, erecting two corrugated tubes 11 to be butted, detecting and finishing the flatness of butted end faces of the corrugated tubes 11, and finishing the end faces of the corrugated tubes 11 if necessary.

S2, polishing, namely polishing the outer wall of the butt joint end of the corrugated pipe 11, wherein a steel wire brush matched with the wave crests and the wave troughs of the corrugated pipe 11 is adopted for polishing, a polishing area extends for 120mm at least along the axial direction of the common corrugated pipe 11 on the two corrugated pipes 11, the polishing area is generally controlled to be more than three half-wave sections of a single corrugated pipe 11, and the polishing area needs to be cleaned after polishing is completed.

And S3, sleeving the heat-shrinkable tube 12 at the butt joint end of one corrugated tube 11 in a penetrating manner, and drawing the heat-shrinkable tube 12 to the part, far away from the butt joint end, of one corrugated tube 11.

S4, fixing, namely centering, aligning, abutting and fixing the two corrugated pipes 11; the heat shrink tubing 12 is then pulled to a ground area that shields the two corrugated tubing 11.

S5, baking, namely positioning the end part of the heat shrinkable tube 12 through a coaxial positioning device to enable the heat shrinkable tube 12 to be coaxial with the corrugated tube 11, then heating the heat shrinkable tube 12 annularly and moving the heat shrinkable tube 12 slowly along the axial direction of the heat shrinkable tube, and driving the coaxial positioning device to gradually withdraw from the heat shrinkable tube 12 when moving and heating towards the end part of the heat shrinkable tube 12.

S6, closing up, keeping the coaxial positioning device to position the heat shrinkable tube 12 when the heat shrinkable tube 12 is heated to the end part of the heat shrinkable tube, heating the inner side wall of the end part of the heat shrinkable tube 12, and then turning to the outer side wall of the heat shrinkable tube 12 for heating.

And S7, sealing, after the heat shrinkable tube 12 is attached, uniformly heating the heat shrinkable tube 12 by using low fire until hot melt adhesive overflows from the end part of the heat shrinkable tube, and naturally cooling.

Therefore, in the process of heating and baking the heat shrinkable tube 12, the two ends of the heat shrinkable tube 12 are positioned in advance through the coaxial positioning device, the non-heat-shrinkable part of the heat shrinkable tube 12 can be always in a coaxial state with the corrugated tube 11, and along with gradual outward diffusion of the heat-shrinkable part of the heat shrinkable tube 12, the coaxial positioning device also gradually withdraws from a gap between the heat shrinkable tube 12 and the corrugated tube 11, the heat shrinkable tube 12 can be always kept in a state coaxial with the corrugated tube 11 and is shrunk and coated on the corrugated tube 11 in the heating process, so that the shrinkage of the heat shrinkable tube 12 corresponding to the circumferential parts of the corrugated tube 11 is close, a good laminating effect of the heat shrinkable tube 12 and the corrugated tube 11 can be ensured, and the phenomenon that the sealing performance of the joint of the corrugated tube 11 is not strong due to the wrinkle of the heat shrinkable tube 12 is avoided. And because when heating to 12 tip of pyrocondensation pipe, heat 12 tip of pyrocondensation pipe inner wall earlier, turn to the lateral wall heating again, can make the higher also more even of hot melt adhesive softening degree on 12 tip of pyrocondensation pipe, and then can make 12 tip of pyrocondensation pipe and bellows 11 form very inseparable firm connection, improve pyrocondensation pipe 12 and bellows 11 joint strength and sealing performance.

In practical operation, the two bellows 11 are fixed in step S4 by: the PE welding rods 13 are attached to the butt joint of the two corrugated pipes 11 around the circumference of the butt joint, the PE welding rods 13 are heated to fix the two corrugated pipes 11, the used PE welding rods 13 can surround the butt joint end of the corrugated pipe 11 for a circle, and multi-section local welding can be performed on the corrugated pipe 11 through the multi-section PE welding rods 13, and the multi-section PE welding rods 13 are selected to be adopted in the embodiment. And after the two corrugated pipes 11 are fixed, preheating the butt ends of the corrugated pipes 11 to 40-50 ℃, winding the thermal contraction band 14 for more than one circle at the butt joint of the two corrugated pipes 11, and heating the thermal contraction band 14 to enable the thermal contraction band 14 to be attached to the corrugated pipes 11.

Therefore, the two corrugated pipes 11 can be preliminarily welded and fixed after the PE welding rods 13 are subjected to multi-point welding, so that the subsequent thermal shrinkage coating and attaching effect of the thermal shrinkage pipe 12 is facilitated, the axial bending strength of the butt joint of the two corrugated pipes 11 can be improved to a certain extent, and the durability of the butt joint of the corrugated pipes 11 is improved. And the joint of the two fixed corrugated pipes 11 can be effectively sealed by winding the heat shrinkable tape 14, so that the sealing and waterproof effects of the joint of the two corrugated pipes 11 are improved, and compared with the conventional hoop connection, the pressure resistance and the durability are stronger.

In specific implementation, referring to fig. 1 and 2, the coaxial positioning device in step S5 includes a bottom plate 2, two first sliding seats 31 slidably disposed on the bottom plate 2, two first arc plates 32 having inner arc sides disposed oppositely are hinged on the first sliding seats 31, specifically, an upright post 61 is fixedly connected to the first sliding seats 31, and an outer side wall of an arc surface of the first arc plate 32 is rotatably disposed at a top end of the upright post 61, so that the first arc plate 32 can rotate around an axis of the upright post 61; a locking mechanism for locking the two first arc plates 32 is arranged between the free ends of the two first arc plates 32 on the same first slide 31.

A plurality of supporting rods 33 are installed at one side of the first arc plate 32 close to the first sliding seat 31 which is not connected with the first arc plate, a positioning plate 34 which is obliquely arranged is arranged at the free end of the supporting rod 33, the positioning plate 34 is positioned at one side of the supporting rod 33 departing from the axis of the first arc plate 32, the positioning plate 34 is arranged into an arc plate, the inner arc surface of the arc plate is close to the supporting rod 33, and an included angle between the positioning plate 34 and the supporting rod 33 is an acute angle.

When the heat shrinkable tube 12 is to be heated, the two first sliding seats 31 are firstly slid to divide the two first sliding seats 31 into two ends of the heat shrinkable tube 12, then the two first arc plates 32 are turned over to align and enclose the two first arc plates to form a ring shape surrounding the heat shrinkable tube 12, and the two corresponding first arc plates 32 are locked by the locking mechanism. The first sliding seat 31 is pushed again, so that the supporting rod 33 and the positioning plate 34 on the first arc plate 32 are inserted into a gap between the heat shrinkable tube 12 and the corrugated tube 11, at this time, the positioning plates 34 which are obliquely arranged open the heat shrinkable tube 12 together, and the heat shrinkable tube 12 can be kept in a coaxial state with the corrugated tube 11, so that when the heat shrinkable tube 12 is heated, the heat shrinkable tube 12 is heated gradually, the first sliding seat 31 is gradually slid, the positioning plates 34 gradually exit from the heat shrinkable tube 12, the fact that the degree of shrinkage of the heat shrinkable tube 12 corresponding to each position of the periphery of the corrugated tube 11 is close in the heat shrinkage process can be achieved, and a good laminating effect of the heat shrinkable tube 12 and the corrugated tube 11 can be ensured.

Considering that, conventionally, when baking the heat shrinkable tube 12, it is necessary for a constructor to heat by holding a spray gun, the construction experience requirement for the constructor is very high, which results in uncontrollable construction quality, therefore, in step S5, the heat shrinkable tube 12 is heated by the hoop heating device, referring to fig. 1 and fig. 3, the hoop heating device includes a second slide seat 41 which is slidably disposed on the bottom plate 2 and located between the two first slide seats 31, the second slide seat 41 is hinged with two second arc plates 42 whose inner arc sides are oppositely disposed, similarly, the second slide seat 41 is fixedly connected with a stand column 61, and the outer side wall of the arc surface of the second arc plate 42 is rotatably disposed at the top end of the stand column 61, so that the second arc plate 42 can rotate around the axis of the stand column 61. The second arc plate 42 is provided with semicircular rings 43 along the arc profile in a sliding manner, and a locking mechanism for locking the two ends of the two semicircular rings 43 is arranged between the adjacent ends of the two semicircular rings 43; and be provided with a plurality of spray gun mouths 44 towards its axle center on the semicircle ring 43, be connected with the flexible trachea on the spray gun mouth 44, the trachea is kept away from the one end and the gas air supply intercommunication of spray gun mouth 44, still should be with flexible trachea ligature on semicircle ring 43 during concrete operation to do not influence the reciprocal swing of semicircle ring 43 on second arc plate 42 and regard as the standard. Meanwhile, in order to adjust the distance between the spray gun nozzle 44 and the heat shrinkable tube 12, a sleeve 47 along the radial direction of the semicircular ring 43 is fixedly connected to the axial end face of the semicircular ring, the spray gun nozzle 44 is arranged in the sleeve 47 in a penetrating manner, and a fixing bolt 48 with the end part abutting against the spray gun nozzle 44 is further screwed on the outer wall of the sleeve 47.

Thus, when the heat shrinkable tube 12 is heated and baked, the two second arc plates 42 are turned over and the two semicircular rings 43 are locked by the locking mechanism; then, the plurality of flexible gas tubes are communicated with a gas source, combustible gas at the outlet of the spray gun nozzle 44 is ignited, flame sprayed by the plurality of spray gun nozzles 44 on the two semicircular rings 43 can bake the heat shrinkable tube 12 in the circumferential direction, and the plurality of spray gun nozzles 44 can be driven to axially move along the corrugated tube 11 to bake when the second sliding seat 41 is moved. And with the help of semicircle ring 43 and second arc plate 42's sliding connection, can wind two locked semicircle rings 43 of bellows 11 axial reciprocating rotation on second arc plate 42, in order to realize the hoop even heating of a plurality of spray gun mouths 44 to pyrocondensation pipe 12, compare in the handheld spray gun heating of constructor, the construction method of this application is more even to the heating of pyrocondensation pipe 12, the uniformity that pyrocondensation pipe 12 contracts is high, and can not rely on constructor's construction experience too much, the operation degree of difficulty is lower, more do benefit to and promote at the job site.

Considering that when the plurality of spray gun nozzles 44 heat the heat shrinkable tube 12, the heat shrinkable tube 12 is heated to shrink, if the positioning plate 34 and the support rod 33 are not removed immediately, the heat shrinkable tube 12 will shrink and adhere to the positioning plate 34, which may cause bubbles to occur between the heat shrinkable tube 12 and the corrugated tube 11 to affect the adhesion degree of the heat shrinkable tube 12 to the corrugated tube 11; if the positioning plates 34 are pulled out in advance, the positioning plates 34 do not have the effect of coaxially positioning the adjacent heat-shrinkable parts of the heat-shrinkable tube 12, and the circumferential shrinkage of the heat-shrinkable tube 12 is still inconsistent when the heat-shrinkable parts are baked and heated.

In view of this, referring to fig. 1, a push rod 46 pointing to the first slide 31 is fixed on the second slide 41, and when the free end of the push rod 46 collides with the first slide 31, the nozzle 44 approaches the end of the positioning plate 34 closest to the support rod 33.

Thus, by controlling the length of the push rod 46, the part of the spray gun nozzle 44 aligned with the heat shrinkable tube 12 is kept adjacent to the free end of the support rod 33, when the second slide 41 drives the spray gun nozzles 44 thereon to axially move along the corrugated tube 11 and bake, the push rod 46 on the second slide 41 pushes the first slide 31 to synchronously move, so that the positioning plates 34 on the first slide 31 synchronously withdraw from the heat shrinkable tube 12 for a certain distance, the positioning plate 34 does not need to be manually withdrawn by a constructor, and one end of the positioning plate 34 close to the spray gun nozzle 44 is always adjacent to the heat shrinkable part of the heat shrinkable tube 12, so that the coaxial positioning effect of the positioning plates 34 on the heat shrinkable tube 12 can be ensured. In actual construction, in order to ensure a high-quality bonding effect of the heat shrinkable tube 12, the spray gun nozzle 44 is moved back along the axial direction of the corrugated tubes 11, and at this time, the first slide seat 31 does not move back to the butt joint of the two corrugated tubes 11 along with the second slide seat 41, so that the heat shrinkable tube 12 bonded on the corrugated tubes 11 is not damaged, and the construction method of the application is more suitable for actual construction.

In order to realize the high-quality closing effect on the end portion of the heat shrinkable tube 12 in the step S6, referring to fig. 1 and 2, the positioning plate 34 is hinged to the supporting rod 33, one end of the positioning plate 34 farthest from the supporting rod 33 is hinged to the inclined strut 35, one end of the supporting rod 33 close to the first arc plate 32 is provided with a sliding groove 36 arranged along the length direction of the supporting rod, and one end of the inclined strut 35 close to the supporting rod 33 is provided with a sliding head 37 arranged in the sliding groove 36 in a sliding manner; in an initial state, the inclined strut 35 is inclined in a direction away from the first arc plate 32, and an included angle between the inclined strut 35 and the support rod 33 is an acute angle. Further, the control frame 51 is attached to the base plate 2, and in consideration of the fact, the control frame 51 is also formed of two arc plates in the same manner as the first arc plate 32 and the second arc plate 42, and the two arc plates can be turned over to avoid the corrugated tube 11. A plurality of control rods 52 corresponding to the plurality of diagonal braces 35 one by one are fixedly connected to one side of the control frame 51 close to the positioning plate 34, and the control rods 52 point to the diagonal braces 35.

Thus, when the heat shrinkable tube 12 is closed, the control frame 51 is installed at a proper position on the bottom plate 2, when the first slide seat 31 slides to the position plate 34 and is close to and separated from the end of the heat shrinkable tube 12, the diagonal rod 35 hinged to the position plate 34 abuts against the control rod 52, and along with the continuous sliding of the first slide seat 31 in the direction close to the control frame 51, the diagonal rod 35 drives the sliding head 37 to approach in the sliding groove 36 in the direction close to the hinged part of the position plate 34 and the support rod 33 under the abutting action of the control rod 52, so that the included angle between the position plate 34 and the support rod 33 is increased, the end of the heat shrinkable tube 12 can be expanded and expanded, and at the moment, the inner wall of the heat shrinkable tube 12 can be baked by using a handheld spray gun, and the heat shrinkable tube 12 does not need to be directly collapsed; after the inner wall of the end of the heat shrinkable tube 12 is baked, the positioning plate 34 and the support rod 33 are completely withdrawn, and at the moment, the end of the heat shrinkable tube 12 still can keep good coaxiality with the corrugated tube 11, so that the circumferential shrinkage uniformity of the heat shrinkable tube is good, and the high-quality closing effect of the end of the heat shrinkable tube 12 can be ensured.

It can be further clear that, in order to facilitate the convenient sliding and position adjustment of the first sliding seat 31, the second sliding seat 41, and the control frame 51 on the bottom plate 2, referring to fig. 1, two sliding rails 62 arranged in parallel are fixedly connected to the bottom plate 2 in a clearance manner, the first sliding seat 31, the second sliding seat 41, and the control frame 51 are all sleeved on the two sliding rails 62 at the same time, wherein the bottom of the control frame 51 is screwed with a locking bolt 63 with an end abutting against the sliding rails 62, so as to fix the control frame 51 conveniently.

And as for the above-mentioned locking mechanism for locking the two first arc plates 32 and the locking mechanism for locking the free ends of the two semicircular rings 43, the specific structures of the locking mechanism and the locking mechanism may be the same or different because the effects to be achieved by the locking mechanism and the locking mechanism are the same. Referring to fig. 2 and 3, in the present embodiment:

the locking mechanism comprises a seat 72 fixedly connected to one of the first arc plates 32 and a buckle 71 fixedly connected to the other first arc plate 32, and when the two first arc plates 32 are butted, the buckle 71 is in lap joint with the seat 72.

The locking mechanism comprises two magnets 73 which are respectively fixedly connected at the butt joint end of the semicircular ring 43 and are attracted magnetically; and the butt joint end of the semicircular rings 43 is further provided with a sunk groove 74, one sunk groove 74 is internally and rotatably provided with a lock pin 75, when the two semicircular rings 43 are in butt joint, the two sunk grooves 74 are communicated, and the lock pin 75 can be turned over to enable the free end of the lock pin 75 to be embedded into the sunk groove 74 on the opposite side so as to axially limit the two semicircular rings 43.

Further, a handle 64 may be installed on the semicircular ring 43 and the second protection plate to facilitate the reciprocal rotation of the semicircular ring 43 and the convenient movement of the second arc plate 42.

Referring to fig. 1, a plurality of support brackets 65 for supporting the bellows 11 are further mounted on the base plate 2.

The implementation principle of the steel strip reinforced helical bellows 11 heat shrinkable sleeve connecting structure and the construction method thereof in the embodiment of the application is as follows: when the heat shrinkable tube 12 is heated and baked, the support rod 33 and the positioning plate 34 on the first arc plate 32 are inserted into the gap between the heat shrinkable tube 12 and the corrugated tube 11, and at this time, the plurality of positioning plates 34 arranged obliquely open the heat shrinkable tube 12 together, so that the heat shrinkable tube 12 is kept coaxial with the corrugated tube 11. The flame sprayed by the plurality of spray gun nozzles 44 on the two semicircular rings 43 is used for baking the heat shrinkable tube 12 in the circumferential direction, the second sliding seat 41 can be moved to drive the plurality of spray gun nozzles 44 to axially move along the corrugated tube 11 for baking, and the plurality of positioning plates 34 on the first sliding seat 31 can synchronously retreat from the heat shrinkable tube 12 by a certain distance through synchronous pushing of the push rod 46, so that the positioning plates 34 do not need to be manually retreated by a constructor. Meanwhile, the two locked semi-circular rings 43 can be axially and reciprocally rotated on the second arc plate 42 around the corrugated pipe 11, so that the circumferential uniform heating of the heat shrinkable pipe 12 by the plurality of spray gun nozzles 44 can be realized, the shrinkage consistency of the heat shrinkable pipe 12 at each position in the circumferential direction of the corrugated pipe 11 in the heat shrinkage process can be ensured, the good laminating effect of the heat shrinkable pipe 12 and the corrugated pipe 11 can be ensured, and the phenomenon that the sealing performance of the joint of the corrugated pipe 11 is poor due to the folds of the heat shrinkable pipe 12 can be avoided.

Compared with the heating of a handheld spray gun of a constructor, the construction mode has the advantages that the heating of the heat shrinkable tube 12 is more uniform, the shrinkage consistency of the heat shrinkable tube 12 is high, the construction experience of the constructor cannot be excessively depended on, the operation difficulty is lower, and the popularization in a construction site is facilitated.

The embodiment of the application also discloses a steel strip reinforced spiral corrugated pipe 11 heat shrinkable sleeve connecting structure which is constructed based on the construction method of the steel strip reinforced spiral corrugated pipe 11 heat shrinkable sleeve connecting structure. Referring to fig. 1, the steel strip reinforced helical bellows 11 heat shrinkable sleeve connection structure includes a plurality of PE welding rods 13 welded at the joint of two bellows 11 and a heat shrinkable band 14 wrapped outside the plurality of PE welding rods 13, the heat shrinkable band 14 is also heat shrunk and wrapped with a heat shrinkable tube 12, and the heat shrinkable tube 12 covers the two bellows 11 for at least more than three half-wave lengths.

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. A construction method of a steel strip reinforced spiral corrugated pipe (11) heat shrinkable sleeve connecting structure is characterized by comprising the following steps: the method comprises the following steps:

s1, making two corrugated pipes (11) to be butted overhead, and detecting and finishing the flatness of butted end faces of the corrugated pipes (11);

s2, polishing, namely polishing the outer wall of the butt joint end of the corrugated pipe (11), wherein a polishing area at least extends for 120mm along the axial direction of the corrugated pipe (11), and cleaning is needed after polishing is finished;

s3, sleeving a heat-shrinkable tube (12) at the butt joint end of one corrugated tube (11) in a penetrating manner by using a sleeve, and pulling the heat-shrinkable tube (12) to a position far away from the butt joint end;

s4, fixing, namely aligning and tightly abutting the two corrugated pipes (11) in the middle and fixing; subsequently drawing the heat shrinkable tube (12) to a ground area covering both of the corrugated tubes (11);

s5, baking, namely positioning the end part of the heat shrinkable tube (12) through a coaxial positioning device to enable the heat shrinkable tube (12) and the corrugated tube (11) to be coaxial, then heating the heat shrinkable tube (12) annularly and moving the heat shrinkable tube slowly along the axial direction of the heat shrinkable tube (12), and driving the coaxial positioning device to gradually withdraw from the heat shrinkable tube (12) when moving towards the end part of the heat shrinkable tube (12) and heating;

s6, closing up, namely when the heat shrinkable tube (12) is heated to the end part of the heat shrinkable tube, keeping the coaxial positioning device to position the heat shrinkable tube (12), heating the inner side wall of the end part of the heat shrinkable tube (12), and then turning to the outer side wall of the heat shrinkable tube (12) for heating;

and S7, sealing, namely after the heat shrinkable tube (12) is attached, uniformly heating the heat shrinkable tube (12) by using low fire until hot melt adhesive overflows from the end part of the heat shrinkable tube, and naturally cooling.

2. The construction method of the steel strip reinforced helical bellows (11) heat shrinkable sleeve connecting structure according to claim 1, characterized in that: the manner of fixing the two corrugated pipes (11) in the step S4 is as follows:

and attaching a PE welding rod (13) around the circumference of the butt joint of the two corrugated pipes (11), and heating the PE welding rod (13) to fix the two corrugated pipes (11).

3. The construction method of a heat shrinkable sleeve connection structure of a steel strip reinforced helical bellows (11) according to claim 1, characterized in that: in the step S4, after the two corrugated pipes (11) are fixed, the butt joint end of the corrugated pipes (11) is preheated to 40 to 50 ℃, a heat-shrinkable tape (14) is wound around the butt joint portion of the two corrugated pipes (11) for more than one week, and then the heat-shrinkable tape (14) is heated to attach the heat-shrinkable tape (14) to the corrugated pipes (11).

4. A construction method of a heat shrinkable sleeve connection structure of a steel strip reinforced helical bellows (11) according to any one of claims 1 to 3, characterized in that: the coaxial positioning device in the step S5 comprises a bottom plate (2) and two first sliding seats (31) arranged on the bottom plate (2) in a sliding manner, wherein two first arc plates (32) with inner arc sides oppositely arranged are hinged on the first sliding seats (31), and a locking mechanism for locking the two first arc plates (32) is arranged between the free ends of the two first arc plates (32) on the same first sliding seat (31);

first arc board (32) are close to not be connected with it a plurality of bracing pieces (33) are installed to one side of first slide (31), bracing piece (33) free end is provided with locating plate (34) that the slope set up, locating plate (34) are located bracing piece (33) deviate from one side of first arc board (32) axle center, locating plate (34) with contained angle between bracing piece (33) is the acute angle.

5. The construction method of a heat shrinkable sleeve connection structure of a steel strip reinforced helical bellows (11) according to claim 4, characterized in that: the positioning plate (34) is arranged to be an arc-shaped plate, and the inner arc surface of the positioning plate is close to the supporting rod (33).

6. The construction method of a heat shrinkable sleeve connection structure of a steel strip reinforced helical bellows (11) according to claim 4, characterized in that: in the step S5, the heat shrinkable tube (12) is heated in the circumferential direction through a circumferential heating device, the circumferential heating device comprises a second slide seat (41) which is arranged on the bottom plate (2) in a sliding manner and is positioned between the two first slide seats (31), two second arc plates (42) with inner arc sides oppositely arranged are hinged on the second slide seat (41), a semicircular ring (43) is arranged on the second arc plates (42) in a sliding manner along the arc profile of the second arc plates, and a locking mechanism for locking the two end parts is arranged between the adjacent end parts of the two semicircular rings (43);

be provided with spray gun mouth (44) of its axle center of a plurality of directions on semicircle ring (43), be connected with flexible trachea on spray gun mouth (44), the trachea is kept away from the one end and the gas air supply intercommunication of spray gun mouth (44).

7. The construction method of the steel strip reinforced helical bellows (11) heat shrinkable sleeve connecting structure according to claim 6, characterized in that: the rigid coupling has on second slide (41) points to push rod (46) of first slide (31), works as push rod (46) free end with when first slide (31) are contradicted, spray gun mouth (44) are close locating plate (34) are closest in the one end of bracing piece (33).

8. The construction method of a heat shrinkable sleeve connection structure of a steel strip reinforced helical bellows (11) according to claim 4, characterized in that: the positioning plate (34) is hinged to the supporting rod (33), one end, farthest away from the supporting rod (33), of the positioning plate (34) is hinged to an inclined supporting rod (35), one end, close to the first arc plate (32), of the supporting rod (33) is provided with a sliding groove (36) arranged along the length direction of the supporting rod, and one end, close to the supporting rod (33), of the inclined supporting rod (35) is provided with a sliding head (37) arranged in the sliding groove (36) in a sliding mode;

in an initial state, the inclined stay bar (35) inclines towards a direction departing from the first arc plate (32), and an included angle between the inclined stay bar (35) and the support bar (33) is an acute angle.

9. The construction method of a heat shrinkable sleeve connection structure of a steel strip reinforced helical bellows (11) according to claim 8, characterized in that: a control frame (51) is mounted on the bottom plate (2), a plurality of control rods (52) which correspond to the inclined support rods (35) one by one are fixedly connected to one side, close to the positioning plate (34), of the control frame (51), and the control rods (52) point to the inclined support rods (35).

10. A steel strip reinforced helical bellows (11) heat shrinkable sleeve connection structure constructed by the construction method of the steel strip reinforced helical bellows (11) heat shrinkable sleeve connection structure according to any one of claims 1 to 9, characterized in that: the heat shrinkable tube comprises a plurality of PE welding rods (13) welded at the butt joint of two corrugated tubes (11) and a heat shrinkable tube (14) coated outside the PE welding rods (13), wherein the heat shrinkable tube (12) is further coated outside the heat shrinkable tube (14) in a heat shrinkable mode, and the heat shrinkable tube (12) covers the two corrugated tubes (11) and is longer than at least three half-wave sections.