Pipeline hydrostatic test back wall force transmission system

Abstract

The utility model discloses a pipeline hydrostatic test back wall force transmission system belongs to hydrostatic test technical field, including back stop earth mass, back wall, first type steel frame, second type steel frame, force transmission steel sheet and force transmission column, back stop earth mass is opposite the water pipeline end and is arranged, back stop earth mass surface is even and is perpendicular to pipeline axis, and the back wall, first type steel frame, second type steel frame, force transmission steel sheet and force transmission column are sequentially arranged between the two, the back wall is close to back stop earth mass and is arranged, first type steel frame, second type steel frame and force transmission steel sheet are sequentially and stand on the back wall, and the length of force transmission column is adjustable, and the force transmission column is pressed to the cap and force transmission steel sheet. The utility model has good stability, simple operation, short construction period, flexible transmission interval spacing can be adjusted, and the cost can be reduced by recycling.

Description

Technical Field

[0001] This utility model relates to a force transmission system for the back wall after a pipeline water pressure test, belonging to the field of pipeline construction technology. Background Technology

[0002] The backwall force transmission system is suitable for the hydrostatic testing phase of water transmission pipelines. Hydrostatic testing is a crucial step in water transmission pipeline construction, verifying the pipeline system's design, construction, overall stability, and the pressure-bearing capacity necessary for safe operation, ensuring long-term safe operation. Under high pressure, tests can also promptly identify and remedy defects in the pipe body itself, welds, manholes, expansion joints, and other ancillary facilities. Furthermore, it verifies the rationality, correctness, and reliability of the pipeline system's design and construction, as well as the performance of pipe materials, interface quality, weld quality, and the strength and stability of anchor blocks, thrust blocks, and supports. It also improves the stress conditions at pipe defects and reduces or eliminates existing residual stress in the pipe body.

[0003] The back wall force transmission system is suitable for the hydrostatic testing phase of water pipelines. The most crucial step in the preparatory work for the hydrostatic test is the installation of the back wall force transmission system. According to the hydrostatic testing technical specifications, the installation quality and sealing performance of the pipeline will be tested after construction. During the pressurization process, an axial thrust will form inside the pipeline under high pressure. Considering the protection of the finished pipeline and the safety of the testing personnel, a back wall force transmission system needs to be installed at both ends of the pipeline to suppress the axial thrust generated inside the pipeline and prevent damage or displacement. Given the long length of the water pipeline, hydrostatic testing needs to be conducted in sections. Based on the existing back wall force transmission system scheme, technical optimization is needed to address its shortcomings. The main shortcomings of the original scheme are: 1. Traditional back walls are constructed using vertical formwork, resulting in long construction periods, high costs, and non-reusability; 2. Some force transmission systems lack pressure monitoring and buffer structures, which can cause impact damage to the force transmission system when pressure increases during pressurization, creating safety hazards. Therefore, a back wall force transmission system device that is easy to install and disassemble, low-cost, and without safety risks is needed. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, this utility model provides a back wall force transmission system after a pipeline water pressure test.

[0005] The technical solution adopted in this utility model is as follows: a back wall force transmission system for pipeline water pressure testing is designed for water pipeline pressure testing. The end of the water pipeline is provided with a nut, which includes a back thrust soil body, a back wall, a first type of steel frame, a second type of steel frame, a force transmission steel plate, and a force transmission column. The back thrust soil body is set directly opposite the end of the water pipeline. The surface of the back thrust soil body is flat and perpendicular to the pipeline axis. The back wall, the first type of steel frame, the second type of steel frame, the force transmission steel plate, and the force transmission column are arranged sequentially between the two. The back wall is set tightly against the back thrust soil body. The first type of steel frame, the second type of steel frame, and the force transmission steel plate stand sequentially and abut against the back wall. The length of the force transmission column is adjustable, and the force transmission column abuts against the nut and the force transmission steel plate. By setting up a multi-stage force transmission system consisting of a backfill, back wall, steel frame, force transmission plates, and force transmission columns, the axial thrust borne by the end cap during the hydrostatic test can be gradually distributed to the backfill, avoiding local stress concentration that could lead to damage to pipe joints or the end cap. The adjustable design of the force transmission columns can adapt to different pipe lengths and test pressure requirements, improving the system's versatility.

[0006] Furthermore, the force transmission column is a jack. Specifying the force transmission column as a jack leverages the linear thrust characteristic of jacks, facilitating operation and adjustment by the operator.

[0007] Furthermore, four 100t jacks are installed between the end cap and the force transmission steel plate, arranged in a circumferential array along the end cap. This circumferential array of four 100t jacks ensures uniform transmission of axial thrust, preventing end cap deformation or seal failure caused by uneven stress at a single point. The coordinated operation of multiple jacks improves system redundancy, ensuring experimental safety even if individual jacks fail. Furthermore, the back wall is constructed by stacking precast reinforced concrete blocks tightly against the back thrust soil. The back wall, constructed from precast reinforced concrete blocks, features structural stability and high compressive strength, effectively transferring and dispersing thrust to the back thrust soil. Additionally, the precast blocks can be quickly assembled, reducing on-site construction time.

[0008] Furthermore, the back wall is constructed from two layers of precast reinforced concrete blocks, which are C30 cubic blocks. The use of two layers of C30 precast reinforced concrete blocks further optimizes the load-bearing capacity and stability of the back wall. Simultaneously, the standardized precast blocks facilitate transportation and on-site assembly, improving construction efficiency.

[0009] Furthermore, both the first and second steel frames are welded from H-beams and formed into a grid structure. The grid structure of the steel frames, constructed from H-beams, reduces weight while maintaining structural strength. The grid design facilitates integration with the force-transmitting steel plate and the back wall, ensuring the continuity of the force transmission path.

[0010] Furthermore, the length and width dimensions of the backfill bulldozer body are not smaller than those of the back wall, the length and width dimensions of the back wall are larger than those of the first type of steel frame, and the length and width dimensions of the first type of steel frame are larger than those of the second type of steel frame. By progressively enlarging the dimensions of each component (backfill bulldozer body ≥ back wall > first type of steel frame > second type of steel frame), a "pyramid" force transmission structure is formed, making the thrust distribution more uniform and avoiding structural damage caused by local stress concentration.

[0011] Furthermore, it is installed at the ends of ductile iron water pipes, PCCP water pipes, or mixed water pipes containing at least one of the two. The system is clearly applicable to pipes of different materials such as ductile iron and PCCP, and is particularly suitable for end testing requirements of mixed pipe materials. Its standardized design reduces equipment modification costs and expands its applicability.

[0012] Furthermore, the plug and the water pipe end are connected via a socket and spigot interchange, and each end has a flange at the connection point. Several sets of bolt assemblies are circumferentially arranged between the flanges to tighten the plug and the water pipe end. The plug and pipe are connected by flange bolts, and the socket-to-spigot interchange design ensures a tight seal and facilitates quick assembly and disassembly. The tension force of the circumferential bolt assemblies is evenly distributed to prevent leakage at the interface during testing.

[0013] Furthermore, the plug is constructed from a steel pipe with a steel plate welded to one end. The plug is equipped with a water inlet pipe, a pressurization pipe, a venting pipe, and a drain pipe, each with a gate valve. A pressure gauge is installed on the venting pipe. The plug's steel pipe and welded steel plate structure provides high strength and excellent pressure resistance. The multiple pipelines (water inlet, pressurization, etc.), gate valves, and pressure gauges facilitate water injection, pressurization, venting, and pressure monitoring, enabling integrated control of the testing process.

[0014] Compared with the prior art, the beneficial effects of this utility model are: This invention constructs a simple, easy-to-assemble, low-cost, recyclable force transmission system without safety hazards. This system exhibits good performance and high economic benefits, improving the work efficiency of construction personnel and ensuring on-site construction safety. The invention also boasts excellent stability, simple operation, short construction cycle, flexible adjustment of the force transmission distance, and recyclability to reduce costs.

[0015] This utility model utilizes precast reinforced concrete slabs for the back wall, significantly shortening the construction cycle and reducing costs compared to traditional formwork casting methods. Furthermore, the slabs are reusable, improving resource utilization. The H-beam force transmission system offers stability, effectively suppressing axial thrust within the pipeline and preventing damage or displacement. The multi-stage force transmission structure (soil → wall → steel frame → steel plate → jacks) disperses axial thrust, preventing blockages or overload damage at pipeline interfaces, thus ensuring the safety of the finished pipeline and testing personnel. The entire force transmission system is easy to assemble and disassemble. Precast reinforced concrete blocks, standardized steel frames, and flange connections simplify on-site installation, shorten the construction period, and facilitate segmented hydrostatic testing, improving testing efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the arrangement of the force transmission system of the rear wall of this utility model.

[0018] Figure 2 This is a schematic diagram of the first type of steel frame of this utility model.

[0019] Figure 3 This is a schematic diagram of the second type of steel frame (including the arrangement of jacks, etc.) of this utility model.

[0020] In the diagram: 1. Water supply pipeline; 2. End cap; 3. Backing thrust soil; 4. Back wall; 5. Type I steel frame; 6. Type II steel frame; 7. Force transmission steel plate; 8. Force transmission column; 9. Water inlet pipe; 10. Pressurization pipe; 11. Air supply and exhaust pipe; 12. Drainage pipe; 13. Pressure gauge. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] Example 1 like Figure 1-3 As shown, a back wall 4 force transmission system for pipeline hydrostatic testing is used for pressure testing of water pipeline 1, and is particularly suitable for hydrostatic testing of ductile iron water pipeline ends, PCCP water pipeline ends, or mixed water pipeline ends containing at least one of the two. The water pipeline 1 ends are provided with end caps 2. It includes a back thrust soil body 3, a back wall 4, a first type steel frame 5, a second type steel frame 6, a force transmission steel plate 7, and a force transmission column 8. The back thrust soil body 3 is positioned directly opposite the end of the water pipeline 1. The surface of the back thrust soil body 3 is flat and perpendicular to the pipeline axis. Between the two, the back wall 4, the first type steel frame 5, the second type steel frame 6, the force transmission steel plate 7 (30mm thick steel plate) and the force transmission column 8 are arranged in sequence. The back wall 4 is set tightly against the back thrust soil body 3. The first type steel frame 5, the second type steel frame 6 and the force transmission steel plate 7 stand in sequence (the three can be welded together or stand independently. When the three are independent components, a stepped soil body is set at their lower end for support) and abut against the back wall 4. The length of the force transmission column 8 is adjustable, and the force transmission column 8 abuts against the end cap 2 and the force transmission steel plate 7.

[0024] More specifically, the force transmission column 8 is a jack, and four 100t jacks are installed between the end cap 2 and the force transmission steel plate 7, with the four jacks arranged in a circumferential array along the end cap 2. The back wall 4 is constructed by stacking precast reinforced concrete blocks tightly against the back thrust soil 3 (or by directly using a single steel plate structure). The back wall 4 is constructed by stacking two layers of precast reinforced concrete blocks, which are C30 grade cubes with geometric dimensions of 1.0×1.0×1.0m. The main function of assembling the back wall 4 using precast concrete blocks is to buffer the axial thrust generated inside the pipeline. Its advantages include convenient assembly and disassembly, reduced construction period, reduced cost, reusability, flexible adjustment of the force transmission spacing, and suitability for different sites. More specifically, both the first type of steel frame 5 and the second type of steel frame 6 are welded from 300*300mm H-beams and are welded into a grid structure.

[0025] Example 2 This embodiment is a further optimization of the force transmission system of the back wall 4 after the pipeline hydrostatic test, based on Embodiment 1. In this embodiment, the length and width dimensions of the back thrust soil 3 are not smaller than the length and width dimensions of the back wall 4, the length and width dimensions of the back wall 4 are larger than the length and width dimensions of the first steel frame 5, and the length and width dimensions of the first steel frame 5 are larger than the length and width dimensions of the second steel frame 6.

[0026] It should be noted that the back thrust soil 3 must be undisturbed soil or artificially compacted back thrust soil. The back thrust soil 3 should be treated according to the geological conditions revealed after on-site excavation. If the geological conditions are good, vertical step excavation should be used to construct the back thrust soil 3. If the geological conditions are poor, replacement should be used. For back thrust soil 3 that is soft or not compacted, it should be excavated, replaced, and compacted. If there are loose or voids between the concrete back wall 4 and the original soil (backfilled and compacted soil), crushed stone should be used for artificial backfilling and compaction, with a compaction degree of not less than 95%. At the same time, a counterweight load should be added to the back thrust soil 3 by adding a 1.5m high soil layer at the existing ground elevation. The backfill soil should be compacted to reduce the soil compression ratio.

[0027] The plug 2 is connected to the end of the water supply pipe 1 via a socket and spigot connection (existing technology can be used). A flange (not shown in the attached drawing, existing technology can be used) is installed at the connection point of the plug 2 and the end of the water supply pipe 1. Several sets of bolt assemblies (not shown in the attached drawing, existing technology can be used) are circumferentially installed between the flanges to tighten the plug 2 and the end of the water supply pipe 1. The plug 2 is made of steel pipe with a steel plate welded to one end. The plug 2 is equipped with a water inlet pipe 9, a pressurizing pipe 10, a venting pipe 11, and a drain pipe 12, each with a gate valve. A pressure gauge 13 is installed on the venting pipe 11.

[0028] Furthermore, in the description of this utility model, unless otherwise stated, the terms "multiple," "multiple roots," and "multiple groups" mean two or more, and "several," "several roots," and "several groups" mean one or more. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used only for descriptive purposes and should not be construed as indicating or implying relative importance.

[0029] The specific embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A backwall force transmission system for a pipeline water pressure test, used for pressure testing of a water pipeline, wherein the end of the water pipeline is provided with a blind end, characterized in that: The system includes a backfill rammed earth body, a back wall, a first type of steel frame, a second type of steel frame, a force-transmitting steel plate, and a force-transmitting column. The backfill rammed earth body is positioned directly opposite the end of the water pipeline. The surface of the backfill rammed earth body is flat and perpendicular to the pipeline axis. The back wall, the first type of steel frame, the second type of steel frame, the force-transmitting steel plate, and the force-transmitting column are sequentially arranged between the two. The back wall is set tightly against the backfill rammed earth body. The first type of steel frame, the second type of steel frame, and the force-transmitting steel plate stand sequentially and abut against the back wall. The length of the force-transmitting column is adjustable, and the force-transmitting column abuts against the end cap and the force-transmitting steel plate.

2. The back wall force transmission system after pipeline hydrostatic test according to claim 1, characterized in that: The force transmission column is a jack.

3. The back wall force transmission system after pipeline hydrostatic test according to claim 2, characterized in that: Four 100t jacks are installed between the end cap and the force transmission steel plate, and the four jacks are arranged in an array around the end cap.

4. The back wall force transmission system after pipeline hydrostatic test according to claim 1, characterized in that: The back wall is constructed by stacking precast reinforced concrete blocks tightly against the back thrust soil.

5. The back wall force transmission system after pipeline hydrostatic test according to claim 4, characterized in that: The back wall is constructed of two layers of precast reinforced concrete blocks, which are C30 cubes.

6. The back wall force transmission system after pipeline hydrostatic test according to claim 1, characterized in that: Both the first and second steel frames are welded from H-beams and are welded into a grid structure.

7. The back wall force transmission system after pipeline hydrostatic test according to claim 1, characterized in that: The length and width dimensions of the backfill soil body are not less than the length and width dimensions of the back wall, the length and width dimensions of the back wall are greater than the length and width dimensions of the first type of steel frame, and the length and width dimensions of the first type of steel frame are greater than the length and width dimensions of the second type of steel frame.

8. The back wall force transmission system after pipeline hydrostatic test according to claim 1, characterized in that: It is installed at the end of a ductile iron water pipe, a PCCP water pipe, or a mixed water pipe containing at least one of the two.

9. The back wall force transmission system after pipeline hydrostatic test according to claim 1, characterized in that: The plug and the water supply pipe end are connected by a socket and spigot, and a flange is provided at the connection point of the plug and the water supply pipe end. Several sets of bolt assemblies are arranged circumferentially between the flanges to tighten the plug and the water supply pipe end.

10. The back wall force transmission system after pipeline hydrostatic test according to claim 1, characterized in that: The plug is made of steel pipe with a steel plate welded to one end. The plug is equipped with a water inlet pipe, a pressurization pipe, a venting pipe and a drain pipe, and each pipe is equipped with a switch valve. The venting pipe is equipped with a pressure gauge.

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