PCCP (prestressed concrete cylinder pipe) joint structure

Abstract

The invention relates to the technical field of pipeline construction, in particular to a PCCP (prestressed concrete cylinder pipe) joint structure. The joint structure is used between two adjacent PCCPs, and the two PCCPs are the first pipe and the second pipe respectively. The joint structure comprises an elastic sealing layer and a fixing layer, and the elastic sealing layer is matched with the side wall of the inner joint in a bonding mode so that the inner joint can be flexibly blocked; the fixing layer is located on the inner ring of the elastic sealing layer, and the fixing layer is fixedly connected with the side wall of the inner seam. According to the PCCP joint structure, flexible plugging and rigid connection are carried out on the inner joint, one PCCP limits the other PCCP through rigid connection, the relative displacement distance between the two PCCPs is reduced through limitation, and therefore the pulling force on the elastic sealing layer is reduced, and the sealing performance of the PCCP is improved. And the probability that the elastic sealing layer is separated from the pipeline connector due to strong pulling force is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline construction, and specifically, to a PCCP pipeline joint structure. Background Art

[0002] During the construction of large-scale water conveyance projects using PCCP pipes, pressure testing of the installed PCCP pipes is an important step to ensure the pipeline installation quality. The third pressure test must be carried out on the interfaces after the pipeline is backfilled. The pressure test value is the design value + 0.3 Mpa, and it is stabilized for 2 minutes. If the pressure value does not drop, it is qualified. In actual tests, the pressure values of some PCCP pipeline interfaces decreased during the third pressure test and did not meet the design requirements. The main reasons are analyzed as follows:

[0003] 1. During the pipeline installation process, the "O"-shaped rubber ring at the socket end may be distorted and uneven when fixed.

[0004] 2. During the pipeline backfilling process, the axillary angle part within the support angle range is not filled solidly or the compaction on both sides during backfilling is not carried out symmetrically. Under the soil covering pressure, it may be disturbed and undergo local displacement. Any displacement in the horizontal or vertical direction will inevitably cause relative sliding of the interface, resulting in the rubber ring being unable to expand and fill the gap generated by the displacement change, and leakage of pressure will occur during the pressure test.

[0005] 3. Uneven settlement of some structures and the pipeline foundation causes relative sliding of the interface, and the rubber ring cannot expand and fill the gap generated by the displacement change, resulting in leakage of pressure during the pressure test.

[0006] 4. Local deformation of the interface. During the production and hoisting process, the interface is prone to local deformation due to collision. During the first and second pressure tests, the rubber ring has just the right elasticity, so the pressure can be held. As time goes by, the rubber ring is in a flattened state and its elasticity weakens, and air leakage is likely to occur at local positions, resulting in failure to reach the test pressure.

[0007] In related technologies, for example, a Chinese patent with the publication number: CN221034400U discloses a PCCP pipeline joint structure. This patent realizes a flexible interface by setting polysulfide sealant at the joint. However, when using polysulfide sealant for treatment, the requirements for the painted interface are relatively high and it must be cleaned thoroughly, otherwise it will affect the bonding between the polysulfide sealant and the interface ring. However, due to the limitations of the socket and spigot structure and the construction site conditions, it is very difficult to clean all the base surfaces thoroughly, so it is easy to cause the phenomenon that the polysulfide sealant is not tightly bonded to the pipeline interface. If further displacement occurs during the subsequent use of the PCCP pipeline, the pulling force generated by the displacement is likely to separate the polysulfide sealant from the pipeline interface. Summary of the Invention

[0008] The purpose of the present invention is to provide a PCCP pipeline joint structure, which restricts the displacement of the PCCP pipeline by setting a fixing layer in the inner joint, reducing the pulling force between the elastic sealing layer and the side wall of the gap, so as to solve the problems raised in the above background technology, that is, it is difficult to clean all the base surfaces, resulting in the subsequent displacement of the PCCP pipeline making the polysulfide sealant easy to separate from the pipeline interface.

[0009] To achieve the above purpose, the PCCP pipeline joint structure is used between two adjacent PCCP pipelines, which are respectively the first pipeline and the second pipeline; the gap between the outer circles of the first pipeline and the second pipeline is the outer joint, and the gap between the inner circles is the inner joint; the joint structure is arranged in the inner joint, and the joint structure includes an elastic sealing layer and a fixing layer, where:

[0010] The elastic sealing layer is adhesively matched with the side wall of the inner joint to flexibly seal the inner joint;

[0011] The fixing layer is located inside the elastic sealing layer, and the fixing layer is fixedly connected to the side wall of the inner joint, and is used to limit the relative displacement between the first pipeline and the second pipeline through its own structural strength, reducing the pulling force between the elastic sealing layer and the side wall of the gap.

[0012] In the above technical solution, due to the existence of the fixing layer, the relative displacement between the first pipeline and the second pipeline is restricted by the fixing layer. Under the restrictive effect, it is difficult for a large relative displacement to occur between the first pipeline and the second pipeline, thereby reducing the pulling force on the elastic sealing layer.

[0013] On this basis, the elastic sealing layer is polysulfide sealant or MS sealant. Polysulfide sealant or MS sealant has elasticity and sealing performance, which can ensure the sealing of the inner joint and prevent the inner joint from leaking water. In addition, the fixing layer is made of steel structure or concrete. On the one hand, it is convenient for the installation of the fixing layer, and on the other hand, because the steel structure or concrete has high strength, it can limit the relative displacement between the first pipeline and the second pipeline through its own structural strength.

[0014] In another technical solution, the fixing layer includes a first connecting block fixedly connected to the first pipeline and a second connecting block fixedly connected to the second pipeline; the joint structure further includes a protruding part, the top end of the protruding part extends into the elastic sealing layer, and the bottom end is fixedly arranged on the outer circle of the first connecting block and / or the second connecting block, and is used to reduce the pulling force between the elastic sealing layer and the side wall of the inner joint during the displacement of the first connecting block or the second connecting block.

[0015] This technical solution is an improvement to the fixed layer to avoid the fixed layer from affecting the displacement of the first pipeline and the second pipeline, which is specifically achieved through the protruding part. The protruding part extends into the elastic sealing layer. When the PCCP pipeline displaces, the protruding part will also displace synchronously, thus preventing the pulling force from being between the elastic sealing layer and the inner seam side wall.

[0016] The specific solutions are as follows:

[0017] Solution 1: The protruding part is an annular plate fixedly arranged on the outer circles of the first connecting block and the second connecting block. The outer circle of the annular plate extends into the elastic sealing layer, and is used to transfer the pulling force between the elastic sealing layer and the inner seam side wall to between the elastic sealing layer and the annular plate.

[0018] In this technical solution, the annular structure of the annular plate can fully contact the elastic sealing layer, and can fully prevent the pulling force from being between the elastic sealing layer and the inner seam side wall.

[0019] Solution 2: The protruding part is a plurality of convex rods fixedly arranged on the outer circles of the first connecting block and the second connecting block. The plurality of convex rods are arranged in an annular array, and the ends of the convex rods extend into the elastic sealing layer, and are used to transfer the pulling force between the elastic sealing layer and the inner seam side wall to between the elastic sealing layer and the annular plate.

[0020] In this technical solution, the local contact with the elastic sealing layer is achieved through a plurality of convex rods with a spacing. In this way, on the one hand, the influence on the structure of the elastic sealing layer itself is reduced, and on the other hand, part of the pulling force can be prevented from being between the elastic sealing layer and the inner seam side wall.

[0021] Solution 3: The protruding part is a plurality of push rods arranged in an annular array. The ends of the push rods extend into the elastic sealing layer, and a part of the outer circle of the push rod expands outward to form a protrusion. The push rod applies an extrusion force towards the inner seam side wall to the local part of the elastic sealing layer through the protrusion.

[0022] In this technical solution, the push rod with a protrusion can reduce the generation of pulling force when the PCCP pipeline generates a radial displacement, providing another solution for reducing the pulling force in the present invention, and can improve the application scenarios of the joint structure of the present invention.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. In the PCCP pipeline joint structure, through flexible sealing and rigid connection of the inner seam, the rigid connection is used to limit one PCCP pipeline by another PCCP pipeline, and the limit is used to reduce the relative displacement distance between the two PCCP pipelines, thereby reducing the pulling force on the elastic sealing layer and reducing the probability that the strong pulling force causes the separation of the elastic sealing layer and the pipeline interface.

[0025] 2. In the PCCP pipe joint structure, due to the provision of the protruding part, when the protruding part follows the displacement of the fixing layer, the pulling force between the local part of the elastic sealing layer and the inner joint side wall is overcome through the protruding part, thereby further reducing the probability of the separation of the elastic sealing layer from the pipe interface caused by the stronger pulling force. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 is a schematic diagram of the structure of the fixing layer of the present invention;

[0028] Figure 3 is a schematic diagram of one of the structures of the protruding part of the present invention;

[0029] Figure 4 is a schematic diagram of another structure of the protruding part of the present invention;

[0030] Figure 5 is a schematic diagram of yet another structure of the protruding part of the present invention Figure 1 ;

[0031] Figure 6 is a schematic diagram of yet another structure of the protruding part of the present invention Figure 2 ;

[0032] Figure 7 is a parameter table of the elastic sealing layer of the present invention.

[0033] The meanings of the various reference numerals in the figure are as follows:

[0034] 100, First pipe; 101, Socket ring; 102, Mortar protection layer; 103, Cement mortar; 110, Second pipe; 111, Spigot ring; 120, Rubber ring; 130, Elastic sealing layer; 131, Primer; 140, Fixing layer; 141, Gap; 142, Protruding part; 143, Annular plate; 144, Convex rod; 145, Push rod; 150, Polyurea coating; 160, First connecting block; 161, Second connecting block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] Regarding the problem that it is difficult to clean all base surfaces thoroughly, which may cause the polysulfide sealant to be easily separated from the pipe interface during subsequent displacement of the PCCP pipeline. The present invention provides a PCCP pipeline joint structure, which is used between two adjacent PCCP pipelines, as Figure 1 shown. The two PCCP pipelines are respectively the first pipeline 100 on the left and the second pipeline 110 on the right. Mortar 103 is provided on the outer circles of both the first pipeline 100 and the second pipeline 110 for protection. The inner circle part of the first pipeline 100 protrudes towards the second pipeline 110, and a socket ring 101 is provided on the outer circle of the protruding part; the outer circle part of the second pipeline 110 protrudes towards the first pipeline 100, and a spigot ring 111 is provided on the inner circle of the protruding part; among them, the inner diameter of the spigot ring 111 is adapted to the outer diameter of the socket ring 101, and the contact surface between the two is sealed by a rubber ring 120 provided therebetween.

[0037] After the first pipeline 100 and the socket ring 101 are docked, a gap will be generated between their ends, as Figure 1 shown. The gap on the outer circles of the first pipeline 100 and the second pipeline 110 is the outer seam, and the gap on the inner circles of the first pipeline 100 and the second pipeline 110 is the inner seam.

[0038] Since the outer seam is on the outer circle and will not come into contact with the water source inside the first pipeline 100 and the second pipeline 110, the outer seam part is directly filled with mortar to form a mortar protection layer 102. Here, the sand used in the mortar shall comply with the relevant requirements of "Construction Sand" (GB / T14684 - 2022). The particle size grading of the sand should be selected in the mortar mix design according to the construction process and on-site construction conditions.

[0039] However, for the inner seam, since the rubber ring 120 cannot expand to fill the voids generated by the displacement changes of the first pipeline 100 and the second pipeline 110 in some cases, in order to prevent the water inside the first pipeline 100 and the second pipeline 110 from leaking through the rubber ring 120, the inner seam also needs to play a sealing role.

[0040] Therefore, Figure 1 shows Embodiment 1 of the present invention. The joint structure is arranged in the inner seam. The joint structure includes an elastic sealing layer 130 and a fixing layer 140. The elastic sealing layer 130 is adhesively fitted with the side wall of the inner seam to perform flexible plugging on the inner seam; the fixing layer 140 is located inside the elastic sealing layer 130, and the fixing layer 140 is fixedly connected to the side wall of the inner seam, and is used to limit the relative displacement between the first pipeline 100 and the second pipeline 110 through its own structural strength, and reduce the pulling force received between the elastic sealing layer 130 and the side wall of the gap.

[0041] In addition, a polyurea coating 150 is provided on the inner circles of the first pipeline 100 and the second pipeline 110. Here, in order to ensure a certain thickness around the coating and prevent the surrounding coating from being lifted due to being too thin under the action of high-speed water flow, it is necessary to grind the concrete into an inverted triangle at the periphery of the coating. The thickness of the single-component polyurea brushed at the edge is greater than 2 mm, and a smooth transition is ensured at the lap joint between the single-component polyurea and the surrounding concrete.

[0042] In the above, the elastic sealing layer 130 can be made of polysulfide sealant or MS sealant. Among them, the physical and chemical properties of the MS sealant shall meet the provisions of the modified silicone building sealant in "Silicone and Modified Silicone Building Sealants" (GB∕T 14683-2017) (reference Figure 7 ); the inspection standards of the MS sealant shall comply with the relevant provisions in "Building Sealants for Concrete Joints" (JC∕T 881-2017) and "Classification and Requirements for Building Sealants" (GB∕T 22083-2008).

[0043] The fixing layer 140 can be made of steel structure or concrete. In this embodiment, concrete is preferably used.

[0044] The working principle of the joint structure of the present invention is as follows:

[0045] Suppose when the second pipeline 110 is displaced, since the fixing layer 140 is fixedly connected to the first pipeline 100 and the second pipeline 110, the second pipeline 110 will also drive the first pipeline 100 to displace through the fixing layer 140 during the displacement process. In this way, the relative displacement between the first pipeline 100 and the second pipeline 110 will be reduced, thereby reducing the pulling force on the elastic sealing layer 130.

[0046] That is to say, by flexibly sealing and rigidly connecting the inner joint, using the rigid connection to limit one PCCP pipeline by the other PCCP pipeline, using the limitation to reduce the relative displacement distance between the two PCCP pipelines, thereby reducing the pulling force on the elastic sealing layer 130 and reducing the probability that the strong pulling force causes the elastic sealing layer 130 to separate from the pipeline interface.

[0047] In Embodiment 2, considering that the PCCP pipeline itself is heavy, when the PCCP pipeline is displaced, the fixing layer 140 is easily stressed and cracked or deformed, or due to the limitation of the fixing layer 140, the PCCP pipeline generates cracks because it cannot be fully displaced by itself. For this reason, this embodiment is optimized on the basis of Embodiment 1. As Figure 2As shown in the figure, in this example, the fixed layer 140 is divided into two parts, and protrusions 142 are provided on the outer circles of the two fixed layers 140. Through this design, the space between the two PCCP pipes will no longer be restricted by the fixed layer 140, but the protrusions 142 are used to reduce the pulling force between the elastic sealing layer 130 and the inner seam side wall.

[0048] Specifically, the fixed layer 140 includes a first connection block 160 fixed on the left side of the inner seam and a second connection block 161 fixed on the right side of the inner seam. A gap 141 is provided between the first connection block 160 and the second connection block 161 to separate them into two independent parts. In this way, assuming that the second pipe 110 is displaced in the direction of arrow w, the first pipe 100 will not restrict the second pipe 110 through the first connection block 160, but the protrusions 142 are used to reduce the pulling force. Figure 2 In the figure, the top end of the protrusion 142 extends into the elastic sealing layer 130, and the bottom end is fixedly arranged on the outer circle of the first connection block 160 and / or the second connection block 161, and is used to reduce the pulling force between the elastic sealing layer 130 and the inner seam side wall during the displacement of the first connection block 160 or the second connection block 161.

[0049] The specific working principle is as follows:

[0050] Reference Figure 2 In the figure, when the first pipe 100 is displaced in the direction of arrow w (i.e., the axial direction of the first pipe 100) or arrow g (i.e., one end of the first pipe 100 is tilted downward), the second pipe 110 drives the first connection block 160 to displace, and the first connection block 160 drives the protrusion 142 to displace. At this time, it can be found that during the displacement of the protrusion 142, the protrusion 142 will push the elastic sealing layer 130 between the protrusion 142 and the inner seam side wall to displace, that is, Figure 2 the area a in the figure. In this way, there will be no pulling force between the elastic sealing layer 130 in area a and the inner seam side wall, and this pulling force is transferred to area b, that is, the pulling force is transferred to between the elastic sealing layer 130 and the side wall of the protrusion 142 (the side of the protrusion 142 close to the gap 141).

[0051] It can be understood that the height h of the protrusion 142 determines the heights of area a and area b. That is to say, the higher the height of the protrusion 142, the higher the heights of area a and area b. Here, the height range of the protrusion 142 is between 0.5 cm and 1 cm.

[0052] Next, the specific structure of the protrusion 142 will be disclosed through the following embodiments.

[0053] As Figure 3As shown, in some embodiments, the protrusion 142 is an annular plate 143 fixedly arranged on the outer rings of the first connection block 160 and the second connection block 161. The outer ring of the annular plate 143 extends from the inner ring of the elastic sealing layer 130 to the interior of the elastic sealing layer 130. The annular plate 143 is used to transfer the pulling force received between the elastic sealing layer 130 and the inner seam sidewall to between the elastic sealing layer 130 and the annular plate 143. In this way, since the annular plate 143 is annular, both sides of the annular plate 143 can come into full contact with the elastic sealing layer 130, improving the effect of reducing the pulling force.

[0054] As Figure 4 shown, in some other embodiments, the protrusion 142 is a plurality of convex rods 144 fixedly arranged on the outer rings of the first connection block 160 and the second connection block 161. The plurality of convex rods 144 are arranged in an annular array. The ends of the convex rods 144 extend from the inner ring of the elastic sealing layer 130 to the interior of the elastic sealing layer 130. The convex rods 144 are used to transfer the pulling force received between the elastic sealing layer 130 and the inner seam sidewall to between the elastic sealing layer 130 and the convex rods 144. Compared with the previous embodiment, in this embodiment, the annular plate 143 is replaced by arranging the convex rods 144 in an array. There are spaces between the plurality of convex rods 144 after the array, and the contact area with the elastic sealing layer 130 is reduced through this space, reducing the influence on the elastic sealing layer 130.

[0055] Both of the above two embodiments change the pulling force received between the elastic sealing layer 130 and the inner seam sidewall when the first pipeline 100 is in the axial direction or one end is inclined downward. In the actual use process, the first pipeline 100 may also have radial displacement (i.e., sink, move downward). Therefore, as Figure 5 shown, in still some other embodiments, the protrusion 142 is a plurality of push rods 145 fixedly arranged on the outer ring of the first connection block 160 or the second connection block 161. The plurality of push rods 145 are arranged in an annular array (refer to Figure 6 ), the ends of the push rods 145 extend from the inner ring of the elastic sealing layer 130 to the interior of the elastic sealing layer 130, and a part of the outer ring of the push rod 145 expands outward to form a protrusion. The push rod 145 applies a squeezing force in the direction of the inner seam sidewall to a part of the elastic sealing layer 130 through the protrusion.

[0056] It should be noted that the push rod 145 is not bonded to the elastic sealing layer 130, but is movably arranged in the elastic sealing layer 130 with the elastic sealing layer 130. At the same time, the shape of the corresponding part of the elastic sealing layer 130 for the push rod 145 is adapted to the shape of the push rod 145.

[0057] The principle of this embodiment is as follows:

[0058] When the second pipeline 110 sinks or moves downward (in the direction of arrow p), the downward movement of the second pipeline 110 will exert a downward pulling force on the elastic sealing layer 130. At the same time, it will also drive the second connecting block 161 to move downward. The second connecting block 161 drives the push rod 145 to move downward, and the push rod 145 drives the protrusions on the outer ring to move downward. Since the elastic sealing layer 130 is fixed and cannot move downward, the downward movement of the protrusions will exert an extrusion force on the bottom (position c) in the direction of the inner seam side wall (position d). At this time, the elastic sealing layer 130 is squeezed towards the inner seam side wall, so that there will no longer be a pulling force between the elastic sealing layer 130 and the inner seam side wall.

[0059] It can be seen that due to the setting of the protrusion 142, when the protrusion 142 follows the displacement of the fixed layer 140, the protrusion 142 is used to overcome the pulling force between the local part of the elastic sealing layer 130 and the inner seam side wall, thereby further reducing the probability that the strong pulling force causes the elastic sealing layer 130 to separate from the pipeline interface.

[0060] It can be understood that the push rod 145 can also be divided into two parts, one part is connected to the second connecting block 161, and the other part is connected to the first connecting block 160. Through this design, whether the first connecting block 160 or the second connecting block 161 moves downward, it can drive the push rod 145 to move downward.

[0061] The annular plate 143, the convex rod 144 and the push rod 145 in the above embodiments are preferably made of steel or plastic. These two materials can be prefabricated in advance, which is convenient for later installation.

[0062] The construction process of the joint structure is described in detail below:

[0063] I. MS sealant

[0064] 1. Cleaning treatment of the inner seam base surface: Use a flat file putty knife to clean and remove the thin edges, impurity sand grains, etc. at the interfaces of the first pipeline 100 and the second pipeline 110. Then use a brush and a hairbrush to clean the surrounding dust, foreign objects and dust in the seam, and use a cloth to clean the accumulated water in the inner seam and dry it with a hair dryer to ensure that the joint is dry. Paper tape can be used and pasted on the surface of the pipeline interface to prevent the glue overflowing during the gluing process from contaminating the non-functional surface. After the cleaning treatment of the inner seam base surface, there is no flowing water.

[0065] 2. Coating of the MS sealant primer 131: The primer 131 is adjusted in the factory according to the requirements of the project for the curing time and film-forming quality. It can be directly used after being opened at the construction site. Open the prepared primer 131, pour it into the glue cup, and use a special glue brush to evenly apply the primer 131 at the interface. Construct from the bottom to the top and apply it back and forth 3 times. When the primer cures to the surface dry state, carry out the next process construction. The curing time is about 2h. It can be dried with a hair dryer. When it can be bonded and drawn when touched by hand, it is surface dry.

[0066] 3. Material preparation: Open the prepared MS sealant, pour in the curing agent and color paste. Place the glue bucket on the mixer, fasten the hoop, set the mixing time to 7 minutes, turn on the power. After mixing, use a scraper to clean the MS sealant adhered to the mixing rod, then reverse mix for 5 minutes and forward mix for 2 minutes.

[0067] After mixing, use a scraper to check whether the MS sealant is evenly mixed and whether there are any particles, etc. After passing the inspection, unload the mixed MS sealant, knock the glue barrel on the ground 5 times to ensure there are no air bubbles in the MS sealant, and use a scraper to clean the MS sealant on the mixing rod. Suck the MS sealant into the glue gun with the glue gun. Note that when sucking the glue, move it up and down to ensure that the glue gun stays in the sealant and does not suck in air, and cover the nozzle.

[0068] 4. Inject MS sealant: When injecting the sealant, insert the nozzle into the inner seam so that the glue overflows from the inside to the outside, and at the same time expel the internal air to ensure that the sealant is full and there is no void after forming. After injecting the sealant, use a scraper to scrape it flat and remove the excess sealant, recycle it into the glue bucket, and finally use a special scraper to press and scrape it flat (there will be a certain groove in the pipe seam after this step), expel the air, and tear off the adhesive tape. After injecting the sealant, it should be cured for a period of time before proceeding to the next construction. The thickness of the injected MS sealant is not less than 2.5 cm.

[0069] 5. Setting of the protruding part 142: After the MS sealant for caulking is cured, use tools to chisel out a groove in the inner circle of the elastic sealing layer 130 with a shape matching that of the protruding part 142, and then place the protruding part 142 in the groove.

[0070] 6. Filling of the fixing layer 140: After the MS sealant for caulking is cured, roughen the side walls of the remaining inner seam, then set up a support forming mold, and then pour the concrete into the mold. The bottom end of the protruding part 142 is inside the mold. After the concrete solidifies and forms, the concrete forms a fixed connection with the protruding part 142. The mix ratio of the concrete is determined through tests and should be effectively bonded to the inner seam.

[0071] The above has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A PCCP pipeline joint structure, which is used between two adjacent PCCP pipelines. The two PCCP pipelines are respectively the first pipeline (100) and the second pipeline (110); the gap between the outer circles of the first pipeline (100) and the second pipeline (110) is the outer joint, and the gap between the inner circles is the inner joint; the joint structure is arranged in the inner joint, and is characterized in that: The joint structure includes an elastic sealing layer (130) and a fixing layer (140), where: The elastic sealing layer (130) is adhesively fitted with the side wall of the inner seam to flexibly seal the inner seam; The fixing layer (140) is located in the inner circle of the elastic sealing layer (130), and the fixing layer (140) is fixedly connected to the side wall of the inner seam, and is used to limit the relative displacement between the first pipe (100) and the second pipe (110) through its own structural strength, and reduce the pulling force received between the elastic sealing layer (130) and the side wall of the gap.

2. The PCCP pipeline joint structure according to claim 1, characterized in that: The elastic sealing layer (130) is polysulfide sealant or MS sealant.

3. The PCCP pipeline joint structure according to claim 1, wherein: The fixing layer (140) is made of steel structure or concrete.

4. The PCCP pipeline joint structure according to claim 1, wherein: The fixing layer (140) includes a first connecting block (160) fixedly connected to the first pipe (100) and a second connecting block (161) fixedly connected to the second pipe (110); The joint structure further includes a protruding portion (142), the top end of the protruding portion (142) extends into the elastic sealing layer (130), and the bottom end is fixedly arranged on the outer circle of the first connecting block (160) and / or the second connecting block (161), and is used to reduce the pulling force received between the elastic sealing layer (130) and the side wall of the inner seam during the displacement of the first connecting block (160) or the second connecting block (161).

5. The PCCP pipeline joint structure according to claim 4, characterized in that: The height range of the protruding portion (142) is between 0.5 cm and 1 cm.

6. The PCCP pipeline joint structure according to claim 4, characterized in that: The protruding portion (142) is an annular plate (143) fixedly arranged on the outer circles of the first connecting block (160) and the second connecting block (161), and the outer circle of the annular plate (143) extends into the elastic sealing layer (130), and is used to transfer the pulling force received between the elastic sealing layer (130) and the side wall of the inner seam to between the elastic sealing layer (130) and the annular plate (143).

7. The PCCP pipeline joint structure according to claim 4, characterized in that: The protruding portion (142) is a plurality of convex rods (144) fixedly arranged on the outer circles of the first connecting block (160) and the second connecting block (161), the plurality of convex rods (144) are arranged in an annular array, and the ends of the convex rods (144) extend into the elastic sealing layer (130), and are used to transfer the pulling force received between the elastic sealing layer (130) and the side wall of the inner seam to between the elastic sealing layer (130) and the annular plate (143).

8. The PCCP pipeline joint structure according to claim 4, characterized in that: The protruding portion (142) is a plurality of push rods (145) arranged in an annular array, the ends of the push rods (145) extend into the elastic sealing layer (130), and a part of the outer circle of the push rod (145) expands outwards to form a protrusion, and the push rod (145) applies an extrusion force towards the side wall of the inner seam to a part of the elastic sealing layer (130) through the protrusion.

9. The PCCP pipeline joint structure according to claim 8, wherein: The push rod (145) is fixedly arranged on the outer circles of the first connecting block (160) and the second connecting block (161).

10. The PCCP pipeline joint structure according to claim 8, characterized in that: The push rod (145) is fixedly arranged on the outer circle of the first connecting block (160) or the second connecting block (161).

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