Joint coating structure of directly-buried hot water heat preservation pipeline joint

Abstract

The utility model discloses a directly-buried hot water heat preservation pipeline connector joint coating structure which comprises butt joints extending out of PE outer protection pipes, the butt joints of every two adjacent PE outer protection pipes are coaxially welded end to end, a stirrup assembly is jointly clamped in every two adjacent butt joints, and a heat preservation mechanism with the two ends extending to the outer walls of the PE outer protection pipes is jointly sleeved outside every two adjacent butt joints. The heat preservation mechanism is fixedly sleeved with a heat shrinkage sealing mechanism with the two ends extending to the outer wall of the PE outer protection pipe. According to the joint coating structure for the directly-buried hot water heat-preservation pipeline joint, rigid reinforcement is conducted from the interior of the heat-preservation pipeline joint through the stirrup assembly, and the pressure resistance of the butt joint position is improved; and flexible reinforcement is carried out from the exterior of the pipeline joint through the heat shrinkage sealing mechanism, the sealing performance and the cracking resistance of the butt joint position are improved, cracking of the bonding position easily caused by thermal elongation of the working steel pipe is eliminated through the internal and external combined action, and therefore permeation of underground water in the joint position is reduced to the maximum extent, and the polyurethane heat preservation layer is protected.

Description

Technical Field

[0001] The utility model belongs to the technical field of thermal insulation pipe connection structures, and in particular relates to a joint patching structure for a directly buried hot water thermal insulation pipe. Background Art

[0002] In actual projects, due to cracks in the joints of directly buried hot water insulation pipes, groundwater seeps into the insulation layer, causing the polyurethane to carbonize and fail after being heated.

[0003] Conventional patching processes mainly include: hot-melt welding of electric hot-melt sleeves (split type, made of PE, with embedded electric heating wires set at the overlap positions with the PE outer protective pipe and the split overlap positions of the electric hot-melt sleeves), baking sealing with heat shrinkable tape, on-site foaming, etc. However, the conventional patching process uses a single bonding method and the overlap width is relatively small. As the working steel pipe elongates thermally, the steel pipe joints at the bonding position are easily misaligned, resulting in cracks in the patch, allowing groundwater to enter the polyurethane insulation layer from the weak position of the hot-melt welding quality, reducing or even damaging the insulation structure. Utility Model Content

[0004] The utility model aims to provide a directly buried hot water insulation pipe joint patching structure, which solves the problem that the existing insulation pipe joint patching is easy to crack.

[0005] The technical scheme adopted by the utility model is: a directly buried hot water insulation pipe joint patching structure, including a butt joint extending out of a PE outer protective pipe, the butt joints of two adjacent PE outer protective pipes are coaxially welded end to end, a stirrup assembly is commonly clamped inside the two adjacent butt joints, an insulation mechanism with two ends extending to the outer wall of the PE outer protective pipe is commonly sleeved outside the two adjacent butt joints, and a heat shrinkage sealing mechanism with two ends extending to the outer wall of the PE outer protective pipe is fixedly sleeved outside the insulation mechanism.

[0006] The utility model is also characterized in that:

[0007] The stirrup assembly includes a reinforcement ring located at the joint position of the inner walls of two adjacent butt joints, and both ends of the reinforcement ring are connected with multiple reinforcement strips parallel to the axial direction at evenly spaced intervals along the circumferential direction, and the other end of the reinforcement strip at each end of the reinforcement ring is commonly connected to a support ring, and both ends of the reinforcement ring are provided with multiple clamping grooves at evenly spaced intervals along the circumferential direction, and the inner walls of the two adjacent butt joints correspond to the clamping grooves at each end of the reinforcement ring to fix clamping blocks of corresponding sizes.

[0008] The heat preservation mechanism comprises an electric heat-melting sleeve, and electric heating wires are embedded in the positions of the two ends of the electric heat-melting sleeve corresponding to the outer wall of the PE outer protective tube. The side wall of the electric heat-melting sleeve is provided with injection ports and exhaust holes at intervals corresponding to the positions of two adjacent butt joints.

[0009] The heat shrink sealing mechanism comprises a heat shrink ring, and positions at both ends of the heat shrink ring corresponding to the outer wall of the PE outer protective tube are sleeved with PET packing tape and stainless steel wire.

[0010] A rubber-plastic sponge layer located outside the heat-insulating mechanism is arranged in the heat-shrinkable sleeve, and two ends of the rubber-plastic sponge layer extend to the outer wall of the PE outer protective tube.

[0011] The beneficial effects of the utility model are as follows: the directly buried hot water insulation pipe joint patching structure of the utility model rigidly reinforces the insulation pipe joint from the inside through the stirrup assembly to improve the pressure resistance of the joint; and then flexibly reinforces the hot water pipe joint from the outside through the heat shrinkage sealing mechanism to improve the sealing and anti-cracking properties of the joint. The joints are effectively eliminated by the joint ... of the heat shrinkage sealing mechanism of the heat shrinkage sealing mechanism of the heat shrinkage sealing mechanism of the heat shrinkage sealing mechanism of the heat shrinkage sealing mechanism of the heat shrinkage sealing mechanism of the heat shrink BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the joint patching structure of the directly buried hot water insulation pipe of the utility model;

[0013] Figure 2 It is a structural schematic diagram of the stirrup assembly in the joint patching structure of the directly buried hot water insulation pipe of the utility model;

[0014] Figure 3 It is a schematic diagram of the installation position of the stirrup assembly in the joint patching structure of the directly buried hot water insulation pipe of the utility model;

[0015] Figure 4 It is a structural schematic diagram of the insulation mechanism in the directly buried hot water insulation pipe joint patching structure of the utility model;

[0016] Figure 5 The utility model is a schematic diagram of the external structure of the joint patching structure of the directly buried hot water insulation pipe.

[0017] In the figure, 1. PE outer protective tube, 2. butt joint, 3. heat shrink ring, 4. rubber-plastic sponge layer, 5. electric hot melt sleeve, 6. PET packing tape, 7. stainless steel wire, 8. electric heating wire, 9. injection port, 10. exhaust hole, 11. clamping block, 12. reinforcement ring, 13. clamping groove, 14. reinforcement strip, 15. support ring. DETAILED DESCRIPTION

[0018] The utility model is described in detail below with reference to the accompanying drawings and specific implementation modes.

[0019] Example 1

[0020] The utility model provides a joint patching structure for directly buried hot water insulation pipes, such as Figure 1As shown, it includes a steel pipe butt joint 2 extending out of a PE outer protective tube 1, polyurethane foam is filled between the steel pipe and the PE outer protective tube 1 as a thermal insulation layer, the butt joints 2 of two adjacent PE outer protective tubes 1 are coaxially welded end to end, a stirrup assembly is commonly clamped inside the two adjacent butt joints 2, and an insulation mechanism with two ends extending to the outer wall of the PE outer protective tube 1 is commonly sleeved outside the two adjacent butt joints 2, and a heat shrinkage sealing mechanism with two ends extending to the outer wall of the PE outer protective tube 1 is fixedly sleeved outside the insulation mechanism.

[0021] like Figure 2 and Figure 3 As shown, the stirrup assembly includes a reinforcement ring 12 located at the inner wall joint position of two adjacent butt joints 2, and both ends of the reinforcement ring 12 are connected with multiple reinforcement strips 14 parallel to the axial direction at uniform intervals along the circumferential direction, and the other end of the reinforcement strips 14 at each end of the reinforcement ring 12 is commonly connected with a support ring 15, and both ends of the reinforcement ring 12 are provided with multiple clamping grooves 13 at uniform intervals along the circumferential direction, and the inner walls of the two adjacent butt joints 2 are fixed with clamping blocks 11 of appropriate size corresponding to the clamping grooves 13 at each end of the reinforcement ring 12. During installation, the clamping grooves 13 of the reinforcement ring 12 and the clamping blocks 11 are used to fix the position of the reinforcement ring 12, and then the inner wall of the butt joint 2 is reinforced in combination with the reinforcement strips 14 and the support ring 15, thereby improving the compression resistance of the welding points of the two butt joints 2.

[0022] like Figure 1 and Figure 5 As shown, the heat shrinkable sealing mechanism includes a heat shrinkable ring 3, which has higher integrity and better sealing performance than the segmented heat shrinkable belt in the conventional process. A rubber-plastic sponge layer 4 located outside the heat preservation mechanism is arranged inside the heat shrinkable ring 3. The rubber-plastic sponge layer 4 uses a rubber-plastic sponge with a larger porosity, which has stronger tensile resistance than the heat shrinkable ring 3. The rubber-plastic sponge layer 4 is sleeved on the two PE outer protective tubes 1 at a length of 30 mm, and the heat shrinkable ring 3 is sleeved on the two PE outer protective tubes 1 at a length of 200 mm. Both ends of the heat shrinkable ring 3 are sleeved with PET strapping tape 6 and stainless steel wire 7, and the stainless steel wire 7 is close to the PET strapping tape 6. PET strapping tape 6 and stainless steel wire 7 are highly resistant to acid and alkali and can withstand erosion by groundwater. PET strapping tape 6 has excellent physical and mechanical properties in a wide temperature range and can be used at a temperature of up to 120°C for a long time. It has outstanding creep resistance, fatigue resistance, friction resistance and dimensional stability. Stainless steel wire 7 is locked after being wrapped around twice, so that the sealing surface of heat shrinkable ferrule 3 can be subjected to the same radial pressure at every point in the annular direction, thereby ensuring the sealing effect.

[0023] Through the above-mentioned method, the patching structure of the direct-buried hot water insulated pipe joint of the utility model is rigidly reinforced from the inside of the insulated pipe joint by a stirrup assembly to improve the pressure resistance of the joint; and then flexibly reinforced from the outside of the hot pipe joint by a heat shrinkage sealing mechanism to improve the sealing and anti-cracking properties of the joint. The joint is effectively eliminated by the joint and the cracking caused by the thermal elongation of the working steel pipe is eliminated, thereby minimizing the infiltration of groundwater at the joint and protecting the polyurethane insulation layer.

[0024] Example 2

[0025] The utility model provides a joint patching structure for directly buried hot water insulation pipes, such as Figure 4 As shown, the heat preservation mechanism includes an electric hot melt sleeve 5, and electric heating wires 8 are embedded in the positions of the outer walls of the PE outer protective tube 1 at both ends of the electric hot melt sleeve 5. The positions of the two adjacent butt joints 2 are spaced apart and provided with injection ports 9 and exhaust holes 10. The injection ports 9 and the exhaust holes 10 cooperate with each other to inject polyurethane into the welding parts of the butt joints 2 of the two PE outer protective tubes 1 through the injection ports 9. The exhaust holes 10 maintain air pressure balance during the injection process, thereby forming a polyurethane insulation layer at the patching position.

[0026] Through the above-mentioned method, the directly buried hot water insulation pipe joint patching structure of the utility model can insulate the patching structure at the joint of the joint 2 of the PE outer protective pipe 1 through the insulation mechanism, thereby reducing the heat loss of the directly buried hot water insulation pipe. At the same time, since the rubber-plastic sponge layer 4 on the outside of the electric hot melt sleeve 5 also has good thermal insulation performance, the patching structure can also be further insulated to reduce the heat loss of the directly buried hot water insulation pipe.

[0027] Example 3

[0028] The utility model provides a patching structure for a directly buried hot water insulation pipe joint. When in use, firstly, the stirrup assembly is clamped to the inner wall joint position of two adjacent joints 2, the clamping groove 13 and the clamping block 11 cooperate to fix the position of the reinforcement ring 12, and then the inner wall of the joint 2 is reinforced by combining the reinforcement strip 14 and the support ring 15. Compared with the prior art which usually only reinforces the outside, it realizes the rigid reinforcement from the inside of the insulation pipe joint, maintains the radial foundation of the joint stable, and thus improves the pressure resistance of the joint. After welding the two joints 2, the electric hot melt sleeve 5 is sleeved, and hot melt welding is performed through the electric heating wire 8, and the injection port 9 and the exhaust hole 10 are used to cooperate to inject polyurethane to form a thermal insulation layer. Then the heat shrinkable ring 3 is put on, and the rubber-plastic sponge layer 4 therein has stronger tensile resistance than the heat shrinkable ring 3. Even if the welding patch is slightly cracked, the rubber-plastic sponge layer 4 can also allow the joint position to have a certain radial freedom. Combined with the heat shrinkable ring 3, it can also maintain the overall sealing of the patch position to prevent groundwater from seeping in. The PET packing tape 6 and stainless steel wire 7 at both ends of the heat shrinkable ring 3 have excellent physical and mechanical properties, thereby ensuring the sealing effect.

[0029] Through the above-mentioned method, the patching structure of the direct-buried hot water insulated pipe joint of the utility model is rigidly reinforced from the inside of the insulated pipe joint by a stirrup assembly to improve the pressure resistance of the joint; and then the heat shrinkage sealing mechanism is used to flexibly reinforce the outside of the hot water pipe joint to improve the sealing and anti-cracking properties of the joint. The joints are effectively eliminated by the combined action of the inside and outside to eliminate the cracking at the bonding position that is susceptible to thermal elongation of the working steel pipe, thereby minimizing the infiltration of groundwater at the joint position and protecting the polyurethane insulation layer. In addition, the insulation mechanism of the utility model can also insulate the patching structure at the joint of the PE outer protective pipe 1 and the joint 2 to minimize the heat loss of the direct-buried hot water insulated pipe.

Claims

1. Direct buried hot water insulation pipe joint patching structure, characterized in that: The invention comprises a butt joint (2) extending out of a PE outer protective tube (1), the butt joints (2) of two adjacent PE outer protective tubes (1) being coaxially welded end to end, a stirrup assembly being commonly clamped inside the two adjacent butt joints (2), a heat preservation mechanism having two ends extending to the outer wall of the PE outer protective tube (1) being commonly sleeved outside the two adjacent butt joints (2), and a heat shrink sealing mechanism having two ends extending to the outer wall of the PE outer protective tube (1) being fixedly sleeved outside the heat preservation mechanism.

2. The directly buried hot water insulation pipe joint patching structure according to claim 1, characterized in that: The stirrup assembly comprises a reinforcement ring (12) located at the joint position of the inner wall of two adjacent butt joints (2), both ends of the reinforcement ring (12) are connected with a plurality of reinforcement strips (14) parallel to the axial direction at even intervals along the circumferential direction, the other end of the reinforcement strips (14) at each end of the reinforcement ring (12) is commonly connected with a support ring (15), both ends of the reinforcement ring (12) are provided with a plurality of clamping grooves (13) at even intervals along the circumferential direction, and the inner walls of the two adjacent butt joints (2) are fixed with clamping blocks (11) of corresponding sizes corresponding to the clamping grooves (13) at each end of the reinforcement ring (12).

3. The directly buried hot water insulation pipe joint patching structure according to claim 1, characterized in that: The heat preservation mechanism comprises an electric heat-insulating sleeve (5), wherein electric heating wires (8) are embedded in positions at both ends of the electric heat-insulating sleeve (5) corresponding to the outer wall of the PE outer protective tube (1), and injection ports (9) and exhaust holes (10) are spaced apart at positions on the side wall of the electric heat-insulating sleeve (5) corresponding to two adjacent butt joints (2).

4. The directly buried hot water insulation pipe joint patching structure according to claim 1, characterized in that: The heat shrink sealing mechanism comprises a heat shrink ring (3), and positions on the outer sides of the heat shrink ring (3) corresponding to the outer wall of the PE outer protective tube (1) are both provided with a PET packing tape (6) and a stainless steel wire (7).

5. The directly buried hot water insulation pipe joint patching structure according to claim 4, characterized in that: A rubber-plastic sponge layer (4) located outside the heat-insulating mechanism is arranged inside the heat-shrinkable sleeve (3), and both ends of the rubber-plastic sponge layer (4) extend to the outer wall of the PE outer protective tube (1).

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