Fabricated lining pipe structure for reinforcing underground pipe network and operation method of fabricated lining pipe structure

Abstract

The invention discloses an assembly type lining pipe structure for underground pipe network reinforcement and an operation method thereof.The lining pipe structure comprises a lining pipe body arranged on the inner side of a damaged pipeline, the lining pipe body is formed by combining and splicing a plurality of lining ring units, and every two adjacent lining ring units are locked through combining arc-shaped screws and nuts; the lining ring unit comprises four UHPC pipe pieces, the four UHPC pipe pieces are distributed in an annular array mode relative to the axis of the damaged pipeline, and a Fe-SMA rib is embedded in each UHPC pipe piece. A UHPC-Fe-SMA combined structure form is adopted, and the Fe-SMA ribs are excited while the UHPC performance is improved. Compared with a traditional lining type pipeline reinforcing technology, the lining pipe body formed through the scheme has certain strength, and long-time supporting does not need to be conducted on the inner side; meanwhile, an assembly type assembly mode is adopted, assembly type supports are adopted in the assembly type assembly mode to position and assemble the pipe pieces, the construction efficiency is greatly improved, and the method is suitable for large-diameter pipeline reinforcement and under-pressure pipeline reinforcement.

Description

Technical Field

[0001] The invention relates to the technical field of prestressed reinforcement of underground pipe network structures, and in particular to an assembled liner pipe structure for reinforcement of underground pipe networks and an operation method thereof. Background Art

[0002] Water supply and drainage pipelines are the "lifeline" of the city, bearing the heavy responsibility of citizens' water use, sewage discharge and collection. With the continuous improvement of my country's urbanization level and the expansion of the existing urban scale, the requirements for the construction of urban water supply and drainage pipelines are also increasing. However, the water supply and drainage pipelines built in the last century have suffered from corrosion, deformation and pipeline rupture due to their long service life. When these pipelines are externally reinforced, it is often necessary to excavate the ground, which has a great impact on urban traffic and citizens' lives. The development of trenchless repair technology has reduced the need for excavation of the overburden on the pipeline. However, for larger diameter pipelines, especially those working under pressure, traditional trenchless repair technology has certain limitations due to the limitations of materials and strength requirements.

[0003] Ultra-High Performance Concrete (UHPC) is a cement-based material with ultra-high compressive, tensile and durable properties. It is suitable for thin-walled, large-span and ultra-high-rise structures. However, the ultra-high performance of the UHPC material itself does not mean that the UHPC components have ultra-high performance. After the UHPC cracks, harmful substances from the outside will penetrate through the cracks to corrode the internal steel fibers or steel bars, thereby weakening the structural performance. Iron-based shape memory alloy (Fe-SMA) is a special metal with shape memory effect (SME). Thanks to its shape memory effect, the residual plastic deformation of Fe-SMA with residual deformation can be restored after high-temperature excitation and cooling. Therefore, when it is built into a concrete structure, the concrete will prevent the recovery of the plastic strain of Fe-SMA, thereby introducing prestress in the concrete structure. Since the prestress generated by Fe-SMA is generated by its own metallographic transformation, it does not require on-site tensioning and no prestress friction loss when used in bending thin-walled structures.

[0004] The external reinforcement of large-diameter underground pipelines requires a large amount of excavation, which greatly affects urban traffic and citizens' lives. If the lining reinforcement takes a long time, it will affect citizens' water use or sewage discharge. UHPC can be made into thin-walled segments to reinforce diseased pipelines. However, strengthening thin-walled bending structures through traditional prestressing technology has certain limitations, and Fe-SMA electrical excitation is difficult to operate in pipelines.

[0005] Therefore, in view of the limitations of the above-mentioned prior art, the present invention proposes an assembled liner pipe structure for reinforcing an underground pipe network and an operation method thereof. Summary of the invention

[0006] The technical problem to be solved by the present invention is to propose an assembled liner pipe structure and an operation method for underground pipeline reinforcement in response to the above-mentioned deficiencies in the prior art. The advantages of UHPC's high crack resistance and durability and Fe-SMA's advantage of no prestressed friction loss are utilized to greatly improve the durability and crack resistance of thin-walled UHPC segments. At the same time, an assembled construction method is adopted to improve construction efficiency and the degree of technical industrialization.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] An assembled liner pipe structure for underground pipe network reinforcement includes a liner pipe body placed inside a defective pipe, which is formed by combining and splicing a plurality of liner ring units, and two adjacent liner ring units are locked by combining an arc screw and a nut;

[0009] The liner ring unit includes four UHPC segments, which are arranged in an annular array about the axis of the defective pipe, each UHPC segment is embedded with Fe-SMA ribs, and both ends of the Fe-SMA ribs are provided with external threads, and the ends of the external threads extend out of both sides of the UHPC segment, and the corresponding Fe-SMA ribs on two adjacent UHPC segments are assembled and combined in an annular direction through standard steel bar connectors;

[0010] The UHPC segments and Fe-SMA ribs are both configured as arc-shaped structural members coaxial with the defective pipeline, wherein an isolation cushion layer is provided on the outside of the UHPC segments to form a void cavity between the defective pipeline and the UHPC segments;

[0011] The length of the arc section of the UHPC segment is less than one-fourth of the circumference of the outer edge of the inner liner ring unit, and the length of the arc section of the Fe-SMA rib is equal to one-fourth of the circumference of the inner edge of the inner liner ring unit, so that the four UHPC segments form a through-type connecting groove at the joint position of the assembly, and the connecting groove is connected to the gap cavity. The outer side of the connecting groove is detachably installed with a steel template, and multiple steel templates are supported on the UHPC segment by a M-shaped supporting steel member to close the outer opening of the connecting groove. A post-injection mortar layer is provided in the gap cavity between the annular structure of multiple UHPC segments and the inner wall of the diseased pipeline and the inner area of ​​the connecting groove;

[0012] A monitoring unit is provided in the UHPC segment for monitoring the deformation of the diseased pipeline and the liner pipe body.

[0013] Preferably, the M-shaped supporting steel member comprises a central connecting member located at the axial center of the inner liner ring unit, and four female screws and four female support rods are distributed in a ring array on the outside thereof, and the four female screws and four female support rods are staggered and distributed in a M-shaped structure;

[0014] A standard internal threaded part is embedded at the center of the inner arc surface of the UHPC segment, a sub-screw is slidably inserted into the inner side of one end of the mother screw away from the center connecting piece, and the other end of the sub-screw is threadedly connected to the standard internal threaded part, and a sub-strut is slidably inserted into the side of the mother support rod away from the center connecting piece, and the other end of the sub-strut is fixedly connected to the steel formwork;

[0015] The outer ends of the sub-screw and the sub-strut are penetrated by inner pin holes, and the outer sides of the mother screw and the mother strut are penetrated by multiple outer pin holes distributed in a linear array, and the mother screw and the sub-screw as well as the mother strut and the sub-strut are limited by pin insertion.

[0016] Preferably, the central connecting member is provided with supporting screw holes corresponding to the four female screws one by one, and the ends of the female screws are threadedly connected to the supporting screw holes;

[0017] The central connecting piece is also provided with support sockets corresponding to the four female support rods one by one, and the ends of the female support rods are inserted into the support sockets.

[0018] Preferably, both ends of the inner wall of the UHPC segment are provided with assembly connection channels distributed along the axial direction thereof, and an arcuate channel is commonly provided between two corresponding assembly connection channels on the inner liner ring unit, the arcuate screw is passed through the arcuate channel, and both ends extend into the assembly connection channels on both sides respectively, and the nut is embedded in the assembly connection channel.

[0019] Preferably, the connection groove is a post-casting area, and both sides of the UHPC segment are provided with reinforcing bar holes for combined positioning and reinforcement of adjacent UHPC segments.

[0020] Preferably, the Fe-SMA ribs are arranged as at least one layer along the thickness direction of the UHPC segment, the number of each group of Fe-SMA ribs is set to multiple, and the multiple Fe-SMA ribs are distributed in a linear array along the axial direction of the UHPC segment.

[0021] Preferably, the monitoring unit includes an optical fiber sensor, which is communicatively connected to an external monitoring terminal, and the UHPC segment side wall is provided with a radial through hole parallel to the central axis thereof, and the optical fiber sensor is inserted into the radial through holes corresponding to the plurality of UHPC segments. Preferably, the isolation cushion layer adopts a protruding point integrally provided with the UHPC segment, and a plurality of protruding points are provided around the outer arc surface of the UHPC segment, and the height of the protruding point is set to 3-30 mm, and the diameter thereof is set to 30 mm.

[0022] Preferably, the thickness of the UHPC segment is set to 30 mm-50 mm, and the thickness of the protective layer formed on the outside of the Fe-SMA rib is set to 5-10 mm.

[0023] The operation method of the assembled liner pipe structure used for underground pipe network reinforcement, and the process of using the structure to reinforce the diseased pipe are as follows:

[0024] Step 1, pre-stretching the Fe-SMA ribs, and processing external threads at both ends of the Fe-SMA ribs;

[0025] Step 2: Make a casting template for the UHPC segment according to the inner diameter of the defective pipe, bend the Fe-SMA ribs into the same curvature as the UHPC segment, and place them in the steel template for casting the UHPC segment;

[0026] Step 3: Cast the UHPC segments, leaving connection grooves, assembly connection channels and radial through holes for Fe-SMA rib connection, and pre-embed standard internal threaded parts at the center, and naturally curing after casting;

[0027] Step 4: After 1-3 days of natural curing, the UHPC segments are sent to a high-temperature oven for high-temperature dry heat curing at a temperature of 100-250°C for 1-2 days to improve the strength of the UHPC segments and complete the Fe-SMA rib excitation;

[0028] Step 5: Fence the top of the defective pipeline, ventilate the inside of the defective pipeline from the manhole, desilt the section to be reinforced, and then transport the cured UHPC segments to the location to be reinforced;

[0029] Step 6: The standard part of the rib connector is pre-installed at one end of the Fe-SMA rib, and then the bottom UHPC segment is installed first. The mother screw is installed using the central connector. Then, the position of the sub-screw is adjusted according to the diameter of the existing defective pipe to be reinforced. The sub-screw is connected to the bottom UHPC segment through the thread at the end of the sub-screw, and the position of the UHPC segment is fine-tuned. Finally, the sub-screw and the mother screw are connected by pins, and the remaining UHPC segments 2 are installed in sequence.

[0030] Step 7. Repeat step 6 to fix other UHPC segments. After the UHPC segments are positioned and supported, reversely screw the standard steel bar connector pre-installed on one side of the Fe-SMA reinforcement onto the Fe-SMA reinforcement thread on the opposite side to complete the UHPC segment connection.

[0031] Step 8, repeat steps 6-7 to repeatedly assemble the ring structure of the UHPC segments into the defective pipe. After the assembly reaches a certain length, the arc screw and nut are embedded into the assembly connection channel to tightly connect and lock the ring structures of adjacent UHPC segments.

[0032] Step 9: Support the outer side of the connection groove and support the steel formwork through the M-shaped support steel member, so that the gap cavity between the annular structure of multiple UHPC segments and the inner wall of the defective pipe and the inner area of ​​the connection groove are combined into a filling cavity, and mortar is used to grout the filling cavity. After solidification, the post-injection mortar layer and the spliced ​​annular structure together form an inner lining ring unit;

[0033] Step 10: Move axially in the defective pipe and repeat steps 6-9 to assemble the liner pipe body in the defective pipe to be reinforced, grind the internal concave and convex parts, make gentle slopes at both ends of the liner pipe body, and complete the reinforcement work.

[0034] The present invention has the following beneficial effects:

[0035] 1. By adopting the UHPC-Fe-SMA combined structure, the designed thin-walled segments have the characteristics of high strength, high crack resistance and high durability, which improves the performance of UHPC while stimulating the Fe-SMA ribs, making it more efficient and convenient. Compared with the traditional liner pipe reinforcement technology, the technology provided by this solution forms a liner pipe body with a certain strength, and there is no need for long-term support on the inside; at the same time, the assembled assembly method is adopted, and assembled supports are used inside to position and assemble the segments, which greatly improves the construction efficiency and is suitable for large-diameter pipeline reinforcement and pressure pipeline reinforcement;

[0036] 2. The Fe-SMA ribs are stimulated by heating and curing the UHPC segments, and the M-shaped support steel members are supported, positioned and fixed inside the existing pipeline. After multiple rings are spliced, the M-shaped support steel members are used to support the formwork from the initial position to fill the gaps, and grouting is performed between the segments and the original pipelines to provide external support for the lining segments. Compared with traditional technologies, the prefabricated segments of the present invention have the advantages of light weight, smooth inner walls, industrialized production and standardized construction, and are suitable for manual or mechanical assembly operations within limited spaces inside diseased pipelines. At the same time, the prestress generated by the Fe-SMA ribs configured inside the UHPC segments can effectively improve the segments' performance in terms of crack resistance, load bearing and durability;

[0037] 3. The present invention adopts an operation method of reinforcing a defective pipeline with an inner lining of UHPC segments, thereby avoiding the large-scale excavation of overlying soil required for pipeline reinforcement. At the same time, it has the characteristics of strong construction performance and high efficiency, and can realize rapid trenchless reinforcement and repair of defective pipeline networks. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A stereoscopic diagram of the partially cut structure of the assembled liner pipe structure for underground pipe network reinforcement provided by the present invention during the process of reinforcing a defective pipe.

[0039] Figure 2It is a partial structural cross-sectional view of the cross-shaped supporting steel member of the present invention (the mother support rod, the sub-support rod and part of the mother screw rod and the sub-screw rod are omitted).

[0040] Figure 3 It is a top view of the UHPC segment in the present invention.

[0041] Figure 4 It is a side view of the UHPC segment in the present invention.

[0042] Figure 5 It is a schematic diagram of the circumferential connection method of two adjacent UHPC segments in the present invention.

[0043] Figure 6 It is a schematic diagram of the connection method of two adjacent UHPC segments in the axial direction in the present invention.

[0044] Among them are: 1. Defective pipeline; 2. UHPC segment; 3. Fe-SMA ribs; 4. Standard parts of steel bar connectors; 5. Connection grooves; 6. Sub screws; 7. Female screws; 8. Pins; 9. Center connectors; 10. Steel formwork; 11. Post-injection mortar layer; 12. Fiber optic sensors; 13. Curved screws;

[0045] 2a, assembly connection channel; 2b, standard internal threaded parts; 2c, radial through hole; 2d, protruding point; 2e, reinforcing bar hole;

[0046] 9a, screw hole; 9b, support socket. DETAILED DESCRIPTION

[0047] In the description of the present invention, it should be understood that the terms "left side", "right side", "upper part", "lower part" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. "First", "second" and the like do not indicate the importance of the components, and therefore cannot be understood as limiting the present invention. The specific dimensions used in this embodiment are only for illustrating the technical solution, and do not limit the scope of protection of the present invention.

[0048] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific preferred embodiments.

[0049] like Figure 1-6 As shown, an assembled liner pipe structure for underground pipe network reinforcement includes a liner pipe body placed inside a defective pipe 1, which is formed by combining and splicing a plurality of liner ring units, and two adjacent liner ring units are locked by combining an arc screw 13 and a nut;

[0050] The lining ring unit includes four UHPC segments 2, which are arranged in an annular array about the axis of the defective pipe 1. Each UHPC segment 2 is embedded with Fe-SMA ribs 3. Specifically, during processing, the thickness of the UHPC segment 2 is set to 30mm-50mm, and the thickness of the protective layer formed on the outside of the Fe-SMA ribs 3 is set to 5-10mm. This helps to improve the initial stiffness of the structure, improve the crack resistance and durability of the UHPC segment 2, and both ends of the Fe-SMA ribs 3 are provided with external threads, and the ends of the external threads extend out of both sides of the UHPC segment 2. The corresponding Fe-SMA ribs 3 on two adjacent UHPC segments 2 are assembled and combined in a circumferential manner through standard steel bar connectors 4;

[0051] The UHPC segments 2 and the Fe-SMA ribs 3 are both configured as arc-shaped structural members coaxial with the defective pipeline 1, wherein an isolation cushion layer is provided on the outside of the UHPC segments 2, so that a gap cavity is formed between the defective pipeline 1 and the UHPC segments 2;

[0052] The length of the arc section of the UHPC segment 2 is less than one-fourth of the circumference of the outer edge of the inner lining ring unit, and the length of the arc section of the Fe-SMA rib 3 is equal to one-fourth of the circumference of the inner edge of the inner lining ring unit, so that the four UHPC segments 2 form a through-type connecting groove 5 at the joint position of the assembly, and the connecting groove 5 is connected with the gap cavity, and a steel template 10 is detachably installed on the outer side of the connecting groove 5. The steel templates 10 are supported on the UHPC segment 2 by a M-shaped supporting steel member to close the outer opening of the connecting groove 5. A post-injection mortar layer 11 is provided in the gap cavity between the annular structure spliced ​​by the multiple UHPC segments 2 and the inner wall of the diseased pipeline 1 and the inner area of ​​the connecting groove 5;

[0053] A monitoring unit is provided in the UHPC segment 2 for monitoring the deformation of the defective pipeline 1 and the liner pipe body.

[0054] As a preferred embodiment of the improved M-shaped support steel member in the present invention, it includes a central connecting member 9 located at the axial center of the inner liner ring unit, and four female screws 7 and four female support rods are distributed in a ring array on the outside thereof, and the four female screws 7 and the four female support rods are staggered to form a M-shaped structure;

[0055] A standard internal threaded part 2b is embedded at the center of the inner arc surface of the UHPC segment 2. The end of the female screw 7 away from the central connecting piece 9 is hollow inside, and a sub-screw 6 is slidably inserted inside the female screw 7, and the other end of the sub-screw 6 is threadedly connected to the standard internal threaded part 2b to support and fix it. A sub-strut is slidably inserted on the side of the female support rod away from the central connecting piece 9, and the other end of the sub-strut is fixedly connected to the steel formwork 10;

[0056] The outer ends of the sub-screw 6 and the sub-strut are penetrated by inner pin holes, and the outer sides of the mother screw 7 and the mother strut are penetrated by multiple outer pin holes distributed in a linear array, and the mother screw 7 and the sub-screw 6 as well as the mother strut and the sub-strut are limited by the insertion pin 8. The pin 8 passes through the inner pin holes and the outer pin holes on the mother screw 7 and the sub-screw 6 to fix the two screw structures, and the extension length of the sub-screw 6 can be adjusted at the same time. Similarly, the adjustment method of the mother strut and the sub-strut is similar to the above method.

[0057] Further, on the basis of the above technical solution, the central connecting piece 9 is provided with supporting screw holes 9a corresponding to the four female screws 7 one by one, and the ends of the female screws 7 are threadedly connected with the supporting screw holes 9a. During construction, firstly, the length of the female screws 7 screwed into the supporting screw holes 9a in the central connecting piece 9 is adjusted according to the inner diameter of the existing defective pipe 1 to be reinforced;

[0058] The central connecting member 9 is also provided with support sockets 9b corresponding to the four female support rods one by one, and the ends of the female support rods are inserted into the support sockets 9b.

[0059] like Figure 2 , Figure 4 and Figure 6 As shown, both ends of the inner wall of the UHPC segment 2 are provided with assembly connection holes 2a distributed along its axial direction, and an arcuate hole is commonly provided between two corresponding assembly connection holes 2a on the inner liner ring unit, and the arcuate screw 13 is passed through the arcuate hole, and both ends extend to the assembly connection holes 2a on both sides respectively, and the nut is embedded in the assembly connection hole 2a, and the adjacent inner liner ring units are tightly connected by tightening the nut and applying a certain pre-tightening force.

[0060] Furthermore, on the basis of the above technical solution, the connecting groove 5 is a post-casting area. Due to the post-casting, it cannot be integrally formed with the surrounding structure, and stratification is prone to occur. It is a weak stress area. Rebar holes 2e are opened on both sides of the UHPC segment 2 for combined positioning and reinforcement of adjacent UHPC segments 2. On the basis of the above technical solution, in order to further improve the overall strength and sealing of the liner ring unit, when the UHPC segment 2 is processed, one side of the upper part is protruding and the other side is recessed, forming a mutually engaging and nested structure, which is convenient for assembly and positioning, and a sealing gasket can be added at the connection.

[0061] Furthermore, on the basis of the above technical solution, the Fe-SMA ribs 3 are arranged as at least one layer along the thickness direction of the UHPC segment 2, the number of each group of Fe-SMA ribs 3 is set to multiple, and the multiple Fe-SMA ribs 3 are distributed in a linear array along the axial direction of the UHPC segment 2, and the internal Fe-SMA ribs 3 help to improve the initial stiffness of the structure and improve the crack resistance and durability of the UHPC segment 2.

[0062] Furthermore, on the basis of the above technical solution, the monitoring unit includes an optical fiber sensor 12, which is communicatively connected to an external monitoring terminal. A radial through hole 2c parallel to the central axis of the UHPC segment 2 is provided through the side wall, and its diameter is set to 2-3 mm. The optical fiber sensor 12 is passed through the radial through holes 2c corresponding to the multiple UHPC segments 2. If a local UHPC segment 2 is deformed, it means that the structure of the diseased pipeline 1 or the liner body is damaged and needs to be maintained in time. In order to further improve the overall strength of the liner body, two adjacent liner ring units are staggered, that is, Figure 1 The UHPC segments 2 in the two liner ring units shown are assembled in a staggered manner along their circumferential direction, and it is necessary to ensure that the reserved assembly connection channels 2a and radial through holes 2c of the adjacent UHPC segments 2 can be butted after the staggered assembly.

[0063] Further, on the basis of the above technical solution, the isolation cushion layer adopts a protruding point 2d integrally set with the UHPC segment 2, and a plurality of protruding points 2d are arranged around the outer arc surface of the UHPC segment 2, and the height of the protruding point 2d is set to 3-30 mm, and the diameter is set to 30 mm.

[0064] The operation method of the assembled liner pipe structure used for underground pipe network reinforcement, and the process of using the structure to reinforce the diseased pipe are as follows:

[0065] Step 1, pre-stretching the Fe-SMA rib 3, and processing external threads at both ends of the Fe-SMA rib 3;

[0066] Step 2: Make a casting template for the UHPC segment 2 according to the inner diameter of the defective pipeline 1, bend the Fe-SMA ribs 3 into the same curvature as the UHPC segment 2, and place them in the steel template for casting the UHPC segment 2. During the production, 1-2 layers of Fe-SMA ribs 3 can be configured according to the thickness of the UHPC segment 2.

[0067] Step 3, pouring the UHPC segment 2, leaving a connection groove 5 for connecting the Fe-SMA ribs 3, assembling the connection channel 2a and the radial through hole 2c, and pre-embedding the standard internal threaded part 2b at the center position, and naturally curing after pouring;

[0068] Step 4: After natural curing for 1-3 days, the UHPC segment 2 is sent to a high-temperature oven for high-temperature dry heat curing at a temperature of 100-250° C. for 1-2 days, thereby improving the strength of the UHPC segment 2 and completing the excitation of the Fe-SMA ribs 3, thereby improving the crack resistance of the segment;

[0069] Step 5: fence the top of the defective pipeline 1, ventilate the inside of the defective pipeline 1 from the manhole, desilt the section to be reinforced, and then transport the cured UHPC segment 2 to the position to be reinforced;

[0070] Step 6, the standard rib connector 4 is pre-installed at one end of the Fe-SMA rib 3, and then the bottom UHPC segment 2 is installed first, and the mother screw 7 is installed using the central connector 9, and then the position of the sub-screw 6 is adjusted according to the diameter of the existing defective pipeline 1 to be reinforced, and the sub-screw 6 is connected to the bottom UHPC segment 2 through the thread at the end of the sub-screw 6, and the position of the UHPC segment 2 is fine-tuned, and finally the sub-screw 6 is connected to the mother screw 7 through the pin 8, and the remaining UHPC segments 2 are installed in sequence;

[0071] Step 7, repeat step 6 to fix other UHPC segments 2. After the UHPC segments 2 are positioned and supported, reversely screw the standard steel bar connector 4 pre-installed on one side of the Fe-SMA reinforcement 3 onto the thread of the opposite side Fe-SMA reinforcement 3 to complete the connection of the UHPC segments 2;

[0072] Step 8, repeat steps 6-7 to repeatedly assemble the annular structure of the UHPC segments 2 into the defective pipeline 1. After the assembly reaches a certain length, the arc screw 13 and the nut are embedded in the assembly connection channel 2a to tightly connect and lock the annular structures of adjacent UHPC segments 2;

[0073] Step 9: Support the outer side of the connecting groove 5 and support the steel formwork 10 by a cross-shaped supporting steel member, so that the annular structure of multiple UHPC segments 2 and the gap cavity between the inner wall of the defective pipe 1 and the inner area of ​​the connecting groove 5 are combined into a filling cavity, and mortar is used to grout the filling cavity, and after solidification into a post-injection mortar layer 11, it forms an inner lining ring unit together with the spliced ​​annular structure;

[0074] Step 10, move axially in the defective pipe 1, and repeat steps 6-9 to assemble the liner pipe body in the defective pipe 1 to be reinforced, grind the internal concave and convex parts, make gentle slopes at both ends of the liner pipe body, and complete the reinforcement work.

[0075] The above method is used to reinforce the defective pipeline. The Fe-SMA rib 3 self-prestressed technology is adopted to fully utilize the advantages of UHPC's high strength, high crack resistance and high durability to form an ultra-thin UHPC-Fe-SMA combined assembled pipe segment. Compared with the traditional liner pipeline reinforcement technology, the technology provided by this scheme forms a liner pipe body with a certain strength. At the same time, the assembly method is adopted to greatly improve the efficiency of the liner reinforced pipeline, which is suitable for large-diameter pipeline reinforcement and pressurized pipeline reinforcement.

[0076] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as those generally understood by those skilled in the art to which this application belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0077] The meaning of "and / or" in the present application refers to including the situations where each exists alone or both exist at the same time.

[0078] The meaning of "connection" in this application can be a direct connection between components or an indirect connection between components through other components. The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the specific details of the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of equivalent transformations, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. An assembled liner pipe structure for reinforcing an underground pipe network, comprising a liner pipe body placed inside a defective pipe (1), which is formed by combining and splicing a plurality of liner ring units, and is characterized by: Two adjacent liner ring units are locked by using an arc-shaped screw (13) and a nut combination; The inner lining ring unit comprises four UHPC segments (2), the four UHPC segments (2) are arranged in a circular array about the axis of the defective pipeline (1), each UHPC segment (2) is embedded with a Fe-SMA rib (3), and both ends of the Fe-SMA rib (3) are provided with external threads, and the ends of the external threads extend out of both sides of the UHPC segment (2), and the corresponding Fe-SMA ribs (3) on two adjacent UHPC segments (2) are assembled and combined in a circular manner through a standard steel bar connector (4); The UHPC segments (2) and the Fe-SMA ribs (3) are both arranged as arc-shaped structural members coaxial with the defective pipeline (1), wherein an isolation cushion layer is arranged on the outside of the UHPC segments (2), so that a void cavity is formed between the defective pipeline (1) and the UHPC segments (2); The length of the arc section of the UHPC segment (2) is less than one-fourth of the circumference of the outer edge of the inner lining ring unit, and the length of the arc section of the Fe-SMA rib (3) is equal to one-fourth of the circumference of the inner edge of the inner lining ring unit, so that the four UHPC segments (2) form a through-type connecting groove (5) at the joint position of the assembly, and the connecting groove (5) is connected to the gap cavity, and the outer side of the connecting groove (5) is detachably installed with a steel template (10), and the steel templates (10) are supported on the UHPC segment (2) by a cross-shaped supporting steel member to close the outer opening of the connecting groove (5), and the gap cavity between the annular structure of the multiple UHPC segments (2) and the inner wall of the defective pipeline (1) and the inner area of ​​the connecting groove (5) are provided with a post-injection mortar layer (11); A monitoring unit is provided in the UHPC pipe segment (2) for monitoring the deformation of the defective pipeline (1) and the liner pipe body.

2. The assembled liner pipe structure for underground pipe network reinforcement according to claim 1, characterized in that: The cross-shaped supporting steel member comprises a central connecting member (9) located at the axial center of the inner liner ring unit, and four female screws (7) and four female support rods are distributed in a ring array on the outer side thereof, and the four female screws (7) and the four female support rods are staggered and distributed to form a cross-shaped structure; A standard internal threaded part (2b) is embedded at the center position of the inner arc surface of the UHPC pipe segment (2); a sub-screw (6) is slidably inserted into the inner side of one end of the mother screw (7) away from the center connecting part (9), and the other end of the sub-screw (6) is threadedly connected to the standard internal threaded part (2b); a sub-strut is slidably inserted into the side of the mother support rod away from the center connecting part (9), and the other end of the sub-strut is fixedly connected to the steel formwork (10); The outer ends of the sub-screw rod (6) and the sub-strut rod are penetrated by inner pin holes, and the outer sides of the mother screw rod (7) and the mother strut rod are penetrated by multiple outer pin holes distributed in a linear array, and the mother screw rod (7) and the sub-screw rod (6) as well as the mother strut rod and the sub-strut rod are all plugged and limited by a pin (8).

3. The assembled liner pipe structure for underground pipe network reinforcement according to claim 2 is characterized in that: The central connecting member (9) is provided with supporting screw holes (9a) corresponding to the four female screw rods (7) one by one, and the ends of the female screw rods (7) are threadedly connected to the supporting screw holes (9a); The central connecting piece (9) is also provided with support sockets (9b) corresponding to the four female support rods one by one, and the ends of the female support rods are inserted into the support sockets (9b).

4. The assembled liner pipe structure for underground pipe network reinforcement according to claim 1, characterized in that: Both ends of the inner wall of the UHPC segment (2) are provided with assembly connection holes (2a) distributed along the axial direction thereof, and an arcuate hole is provided between two corresponding assembly connection holes (2a) on the inner liner ring unit, the arcuate screw (13) is passed through the arcuate hole, and both ends extend into the assembly connection holes (2a) on both sides respectively, and the nut is embedded in the assembly connection hole (2a).

5. The assembled liner pipe structure for underground pipe network reinforcement according to claim 1, characterized in that: The connection groove (5) is a post-casting area, and both sides of the UHPC segment (2) are provided with reinforcement holes (2e) for combining, positioning and reinforcing adjacent UHPC segments (2).

6. The assembled liner pipe structure for underground pipe network reinforcement according to claim 1, characterized in that: The Fe-SMA ribs (3) are arranged as at least one layer along the thickness direction of the UHPC segment (2), the number of each group of Fe-SMA ribs (3) is arranged as a plurality, and the plurality of Fe-SMA ribs (3) are distributed in a linear array along the axial direction of the UHPC segment (2).

7. The assembled liner pipe structure for underground pipe network reinforcement according to claim 1, characterized in that: The monitoring unit comprises an optical fiber sensor (12) which is communicatively connected to an external monitoring terminal; a radial through hole (2c) parallel to the central axis of the UHPC segment (2) is provided through the side wall of the UHPC segment (2); and the optical fiber sensor (12) is inserted into the radial through holes (2c) corresponding to the plurality of UHPC segments (2).

8. The assembled liner pipe structure for underground pipe network reinforcement according to claim 1, characterized in that: The isolation cushion layer adopts a protruding point (2d) integrally arranged with the UHPC segment (2), a plurality of which are arranged around the outer arc surface of the UHPC segment (2), and the height of the protruding point (2d) is set to 3-30 mm, and the diameter is set to 30 mm.

9. The assembled liner pipe structure for underground pipe network reinforcement according to claim 1, characterized in that: The thickness of the UHPC segment (2) is set to 30 mm-50 mm, and the thickness of the protective layer formed on the outside of the Fe-SMA rib (3) is set to 5-10 mm.

10. An operating method of an assembled liner pipe structure for underground pipe network reinforcement according to any one of claims 1 to 9, characterized in that: The process of reinforcing the diseased pipeline is as follows: Step 1, pre-stretching the Fe-SMA rib (3), and processing external threads at both ends of the Fe-SMA rib (3); Step 2: Prepare a casting template for the UHPC segment (2) according to the inner diameter of the defective pipeline (1), bend the Fe-SMA rib (3) into the same curvature as the UHPC segment (2), and place it in the steel template for casting the UHPC segment (2); Step 3, casting the UHPC segment (2), leaving a connection groove (5), an assembly connection channel (2a) and a radial through hole (2c) for connecting the Fe-SMA rib (3) during casting, and pre-embedding a standard internal threaded part (2b) at the center thereof, and naturally curing after casting; Step 4, after natural curing for 1-3 days, the UHPC segment (2) is sent to a high temperature oven for high temperature dry heat curing at a temperature of 100-250° C. for 1-2 days, thereby improving the strength of the UHPC segment (2) and completing the excitation of the Fe-SMA ribs (3); Step 5: fence the top of the defective pipeline (1), ventilate the inside of the defective pipeline (1) from the manhole, desilt the section to be reinforced, and then transport the cured UHPC segment (2) to the location to be reinforced; Step 6: The standard rib connector (4) is pre-installed on one end of the Fe-SMA rib (3), and then the bottom UHPC segment (2) is installed first. The central connector (9) is used to install the female screw (7), and then the position of the sub-screw (6) is adjusted according to the diameter of the existing defective pipeline (1) to be reinforced. The sub-screw (6) is connected to the bottom UHPC segment (2) through the thread at the end of the sub-screw (6), and the position of the UHPC segment (2) is fine-tuned. Finally, the sub-screw (6) and the female screw (7) are connected by a pin (8), and the remaining UHPC segments 2 are installed in sequence. Step 7, repeat step 6 to fix other UHPC segments (2). After the UHPC segments (2) are positioned and supported, the standard steel bar connector (4) pre-installed on one side of the Fe-SMA reinforcement (3) is reversely screwed onto the thread of the Fe-SMA reinforcement (3) on the opposite side to complete the connection of the UHPC segments (2); Step 8, repeating steps 6-7 to repeatedly assemble the ring structure of the UHPC segments (2) into the defective pipeline (1), and after the assembly reaches a certain length, the arc-shaped screw (13) and the nut are inserted into the assembly connection channel (2a), so as to tightly connect and lock the ring structures of adjacent UHPC segments (2); Step 9: A M-shaped supporting steel member is supported on the outside of the connecting groove (5) and supports the steel formwork (10), so that the annular structure of the plurality of UHPC segments (2) and the gap cavity between the inner wall of the defective pipe (1) and the inner area of ​​the connecting groove (5) are combined into a filling cavity, and mortar is injected into the filling cavity, and after solidification, a post-injection mortar layer (11) is formed together with the spliced ​​annular structure to form an inner lining ring unit; Step 10, move in the axial direction inside the defective pipe (1), and repeat steps 6-9 to assemble the inner liner pipe body inside the defective pipe (1) to be reinforced, grind the internal concave and convex parts, make gentle slopes at both ends of the inner liner pipe body, and complete the reinforcement work.

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