A buried water supply pipeline bending place surrounding grouting type sealing shock absorption type treatment construction method

Abstract

The application provides a buried water supply pipeline bending part surrounding grouting type sealing and damping type treatment construction method, relates to the technical field of water conservancy engineering, and is characterized in that an upper surrounding sealing type cement concrete plate and a lower surrounding sealing type cement concrete plate which can be spliced up and down are arranged at the pipeline bending part. The upper surrounding sealing type cement concrete plate and the lower surrounding sealing type cement concrete plate can effectively resist the impact force of water flow, reduce the vibration force generated by water flow impact on the water supply pipeline, and have a damping effect. Since the upper surrounding sealing type cement concrete plate mainly cooperates with the lower surrounding sealing type cement concrete plate to form a pipe wall which wraps the pipeline bending part, the pipe wall can also have a waterproof sealing effect, and the risk of water leakage at the pipeline bending part is reduced.

Description

Technical Field

[0001] This invention relates to the field of water conservancy engineering technology, specifically to a construction method for a surrounding grouting sealing and vibration reduction treatment at bends in buried water supply pipelines. Background Technology

[0002] The safe and stable operation of water supply pipelines is crucial to the water security of countless households. Over time, buried water supply pipelines are susceptible to corrosion, changes in surrounding geological conditions, and cracking. These issues threaten the pipeline's safe operation. When even small cracks appear in the pipeline and leaks continue, they affect the geological conditions, leading to soil erosion and subsidence. As cracks enlarge, they can easily rupture, causing water to overflow onto roads, severely impacting urban water supply and normal traffic flow. In particular, due to the long length of water supply pipelines, sometimes it's necessary to avoid underground pipes. When rationally arranging the pipeline route, bends are often required. These bends essentially change the direction of water flow. When water flows through a bend, it often impacts the pipe wall, creating vibrations and other forces. Over time, fatigue cracks can appear at these bends. Furthermore, bends are often weak points in pipeline manufacturing. During production, the steel pipes may be subjected to bending and compression, potentially creating defects that become the initial areas for cracks to appear over time. Because the water flow at the bend exerts an impact force on the pipe, the vibrations and other forces return to the surrounding soil, causing it to loosen and deform. This can prevent the soil around the bend from properly containing the pipe, leading to resonance between the pipe's vibrations and the water flow. Increased vibration amplitude at the bend can create a risk of pipe cracking. Figure 1 A scene depicting a bent water supply steel pipe. Summary of the Invention

[0003] The purpose of this invention is to propose a construction method for sealing and damping buried water supply pipelines by grouting around bends, in order to solve problems such as vibration at bends, compaction of the soil around the pipeline, waterproofing and water-stopping at bends, durability of the pipeline outer wall, and smooth water flow transition at bends.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0005] A method for constructing a grouting-type sealing and vibration-damping treatment for bends in buried water supply pipelines, characterized by the following steps:

[0006] S1. The upper and lower sides are prefabricated with sealed cement concrete slabs, with reserved grout inlet and outlet.

[0007] S2. Excavate the pipe trench at the bend;

[0008] S3. Install a sealed cement concrete slab around the lower side of the pipe trench at the bend;

[0009] S4. The lower half of the rubber ring is hot-melt installed on the sealed cement concrete slab on the lower side;

[0010] S5. Grout the lower side of the sealed cement concrete slab through the grout inlet;

[0011] S6. Install the bent pipe so that it fits tightly against the lower half of the rubber ring on the lower side of the sealed cement concrete slab, and heat-melt the bent pipe to the lower half of the rubber ring.

[0012] S7. The upper half of the rubber ring is heat-fused and installed on the bent pipe, and the upper half of the rubber ring and the lower half of the rubber ring are heat-fused together to form a whole;

[0013] S8. An upper-side sealed cement concrete slab is installed on the bent pipe, wherein the upper-side sealed cement concrete slab is heat-fused to the upper half rubber ring, and the upper-side sealed cement concrete slab and the lower-side sealed cement concrete slab are tightly attached to each other.

[0014] S9. Install an auxiliary grouting pipe on the grout inlet of the upper closed-type cement concrete slab;

[0015] S10. Backfill the upper part of the upper part of the sealed cement concrete slab surrounding the upper side with soil.

[0016] S11. Grout the upper surrounding sealed cement concrete slab through the grout inlet;

[0017] S12. After grouting is completed, pull out the auxiliary grouting pipe.

[0018] Furthermore, in step S1, both the upper and lower closed-type cement concrete slabs are U-shaped structures. The grout inlet is located on the upper side of the upper and lower closed-type cement concrete slabs, and the grout outlet is located on the lower side and both sides of the upper and lower closed-type cement concrete slabs. The outer dimensions of the concrete slab are determined using steel formwork. 8mm diameter steel bars are added to the concrete slab in a longitudinal and transverse arrangement. Plastic sleeves are used as reserved channels for the grout inlet and outlet. C20 concrete is used for pouring and curing. Then, the formwork is removed and the plastic sleeves of the channels are removed.

[0019] Furthermore, in step S3, the trench at the bend is widened by 200mm on each side to facilitate the placement of the cement concrete slab. The soil on the slope is compacted, and the lower side of the sealed cement concrete slab is installed on the slope bend. The grout inlet and outlet are also cleared.

[0020] Furthermore, in step S5, a pressure pump is used to pressurize the cement mortar. The pressure pump injects cement mortar into the grout inlet of the lower surrounding sealed cement concrete slab. The injection process is slow, and the cement mortar flows through the channel to the grout outlet. Due to the pressure of the pressure pump, the cement mortar will be sprayed into the bottom soil of the lower surrounding sealed cement concrete slab through the grout outlet, and grouting will continue. The cement mortar diffuses in the soil, and as time goes on, the cement mortar and the soil harden.

[0021] Furthermore, in step S7, after the upper rubber ring is heat-fused onto the pipe, a heat-fusion machine is used to heat and fuse the area where the lower and upper rubber rings are connected, so that the openings of the two are connected as a whole through heat fusion.

[0022] Furthermore, in step S9, the auxiliary grouting pipe is a plastic flexible tube. The head of the auxiliary grouting pipe is inserted into the grout inlet of the upper surrounding sealed cement concrete slab and tightened. The length of the auxiliary grouting pipe is determined according to the burial depth of the pipe bend and a corresponding length is reserved.

[0023] Furthermore, in step S11, a pressure pump is used to pressurize the cement mortar. The pressure pump is aimed at the exposed head of the auxiliary grouting pipe for grouting. The injection process is slow. The cement mortar is injected into the grout inlet through the auxiliary grouting pipe and flows to the grout outlet through the channel. Due to the pressure of the pressure pump, the cement mortar will be sprayed into the upper soil of the upper surrounding closed cement concrete slab through the grout outlet. The cement mortar undergoes diffusion hardening in the soil.

[0024] Furthermore, in step S11, during the grouting process, the grout flows from the inlet to the outlet and is injected into the gap between the upper and lower surrounding sealed cement concrete slabs, filling the gap and sealing the two cement concrete slabs.

[0025] Furthermore, in step S12, after grouting is completed, the auxiliary grouting pipe is pulled out using a pulling tool, and the remaining ducts of the grouting pipe are filled with grout using a grouting pump.

[0026] Furthermore, the diameter of both the slurry inlet and the slurry outlet is 20 mm.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] This invention proposes arranging upper and lower sealed cement concrete slabs that can be spliced ​​together at pipe bends. The upper and lower sealed cement concrete slabs effectively resist the impact of water flow, reducing vibration caused by water impacting the water supply pipe, thus achieving a shock absorption effect. Since the upper and lower sealed cement concrete slabs, together, form a wall around the pipe bend, they also provide a waterproof seal, reducing the risk of leakage at the bend. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of a bent pipe structure;

[0031] Figure 2 This is a schematic diagram of the overall structure of the present invention;

[0032] Figure 3 This is a schematic diagram of the upper-side enclosed cement concrete slab structure of the present invention.

[0033] Figure 4 This is a schematic diagram of the upper side of the sealed cement concrete slab from another angle.

[0034] Figure 5 This is a schematic diagram of the lower side of the sealed cement concrete slab structure of the present invention.

[0035] Figure 6 This is a schematic diagram of the structure of the sealed cement concrete slab surrounding the lower side of the present invention from another angle.

[0036] Figure 7 This is a schematic diagram of the hot-melt installation of the lower rubber ring and the lower side surrounding sealed cement concrete slab of the present invention.

[0037] Figure 8 This is a schematic diagram of the hot-melt installation of the upper rubber ring and the upper surrounding sealed cement concrete slab of the present invention.

[0038] Figure 9 This is a schematic diagram of the lower side of the sealed cement concrete slab structure of the present invention.

[0039] Figure 10 This is a schematic diagram of step S4 of the present invention;

[0040] Figure 11This is a schematic diagram of step S5 of the present invention;

[0041] Figure 12 This is a schematic diagram of step S6 of the present invention;

[0042] Figure 13 This is a schematic diagram of step S7 of the present invention;

[0043] Figure 14 This is a schematic diagram of step S8 of the present invention;

[0044] Figure 15 This is a schematic diagram of step S9 of the present invention;

[0045] Figure 16 This is a schematic diagram showing the grouting process after the present invention is completed.

[0046] In the diagram: 1. Bent pipe, 2. Upper side encircling sealed cement concrete slab, 3. Upper half rubber ring, 4. Lower side encircling sealed cement concrete slab, 5. Lower half rubber ring, 6. Grout inlet, 7. Grout outlet, 8. Auxiliary grouting pipe. Detailed Implementation

[0047] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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 invention.

[0049] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0050] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0051] This invention proposes a construction method for sealing and damping buried water supply pipelines by grouting around bends, specifically including the following steps:

[0052] (1) The upper and lower closed-circle cement concrete slabs 2 and 4 are prefabricated. The concrete slabs are U-shaped. The outer dimensions of the concrete slabs are determined using steel formwork. 8mm diameter steel bars are added inside the concrete slabs, arranged longitudinally and transversely. Plastic sleeves are used as channels for the reserved grout inlet 6 and grout outlet 7. C20 concrete is used for pouring and curing, and then the formwork and plastic sleeves for the channels are removed. The upper and lower closed-circle cement concrete slabs 2 and 4 are transported to the site for installation.

[0053] The upper surrounding sealed cement concrete slab 2 is mainly used to cover the upper side of the water supply pipe. The opening is inverted "U" shape to match the outer diameter of the water supply pipe. The upper part of the slab has a grout inlet 6, the lower part of the slab has a grout outlet 7, and the side of the slab has a grout outlet 7. The upper surrounding sealed cement concrete slab 2 is reserved with a connection channel between the grout inlet 6 and the grout outlet 7. The upper surrounding sealed cement concrete slab 2, together with the lower surrounding sealed cement concrete slab 4, forms the pipe wall around the bend of the pipeline. A rubber ring is placed inside. The upper and lower surrounding sealed cement concrete slabs 4 can effectively resist the impact of water flow and reduce the vibration caused by water flow impacting the water supply pipe, thus achieving a shock absorption effect. At the same time, the internal space provided for the rubber ring provides a double shock absorption effect. The concrete slab is equipped with grout inlet 6 and grout outlet 7 to facilitate grouting and provide a grouting channel for reinforcing and compacting the soil around the water supply pipeline. The lower surrounding sealed cement concrete slab 4 and the upper surrounding sealed cement concrete slab 2 have similar shapes. Since the upper surrounding sealed cement concrete slab 2, together with the lower surrounding sealed cement concrete slab 4, forms the pipe wall around the bend of the pipeline, it also plays a waterproof sealing role, reducing the risk of water leakage at the bend of the pipeline.

[0054] It is worth mentioning that, referring to Figure 3 , 4Grout inlets 6 and 7 are located on the upper side of the upper and lower sealed cement concrete slabs 2 and 4, respectively, and are arranged on both sides of the upper side of the concrete slabs. The inlets have a diameter of 20mm. Their function is to inject pressurized cement mortar into the inlets 6 and then spray it out through the internal channels into the outlets 7, injecting it into the soil surrounding the water supply pipe. This reinforces and compacts the soil, ensuring a dense and load-bearing structure around the water supply pipe, reducing vibrations at bends, minimizing the risk of leakage, and improving durability. A portion of the outlets 7 is located at the junction of the upper and lower sealed cement concrete slabs 2 and 4. During grouting, the cement mortar fills the junction, sealing the gaps between the upper and lower slabs, thus forming a unified structure and preventing seepage.

[0055] (2) Pipe trench excavation at bends. Since the pipe bends are roughly in the shape of upper and lower steps, the pipe trench is excavated in a sloping shape to facilitate the installation of the sealed cement concrete slab 4 around the lower side.

[0056] (3) Install the lower side surrounding sealed cement concrete slab 4. (Refer to...) Figure 9 The trench was widened by 200mm on each side to facilitate the placement of the cement concrete slab. The soil on the slope was compacted, and the lower side of the sealed cement concrete slab 4 was installed at the bend of the slope. The grout inlet 6 and grout outlet 7 were cleared.

[0057] (4) The lower half of the rubber ring 5 is installed via hot-melt welding. (Refer to...) Figure 10 Use a blower to clean the surface of the installed lower surrounding sealed cement concrete slab 4, and wipe the surface to remove dust. Heat the bottom of the lower half rubber ring 5 until it melts. After heating, press the back of the lower half rubber ring 5 tightly into the "U" groove of the lower surrounding sealed cement concrete slab 4. After pressing, wait for it to cool and check whether it is firmly attached.

[0058] (5) Grouting of the lower side surrounding the sealed cement concrete slab 4. (Refer to...) Figure 11 A pressure pump is used to pressurize the cement mortar. The pressure pump is aimed at the grout inlet 6 of the lower sealed cement concrete slab 4 and injects the cement mortar. The injection process is slow. The cement mortar flows through the channel to the grout outlet 7. Due to the pressure of the pressure pump, the cement mortar will be sprayed into the bottom soil of the lower sealed cement concrete slab 4 and grouting will continue. The cement mortar diffuses in the soil and hardens with time.

[0059] (6) Pipe installation at bends. Refer to [reference needed]. Figure 12The water supply steel pipe at the bend is installed as a whole to avoid on-site welding. The steel pipe at the bend is tightly attached to the lower half of the rubber ring 5 on the lower side of the sealed cement concrete slab 4. The rubber ring is heated to ensure that the steel pipe at the bend is tightly attached to the rubber ring and the lower side of the sealed cement concrete slab 4.

[0060] (7) The upper rubber ring 3 is heat-fused together. (Refer to...) Figure 13 A dust-blowing gun is used to remove dust from the upper surface of the water supply pipe. The upper half of the rubber ring 3 is heated to a hot-melt state, so that the upper half of the rubber ring 3 is tightly attached to the upper surface of the water supply pipe, and the rubber ring is allowed to cool naturally.

[0061] (8) The lower half rubber ring 5 and the upper half rubber ring 3 are heat-fused together. After the upper half rubber ring 3 is heat-fused into the pipeline, a heat-fusion machine is used to heat-fuse the area where the lower half rubber ring 5 and the upper half rubber ring 3 are connected, so that the opening parts of the two are connected into a whole through heat fusion.

[0062] The lower rubber ring 5 is located inside the "U"-shaped plate surrounding the sealed cement concrete slab 4 on the lower side. The rubber ring is a flexible material and serves as a flexible transition material between the water supply steel pipe and the sealed cement concrete slab. Its function is to resist the vibration force of the water flow, reduce the impact of the water flow force on the steel pipe, and at the same time reduce the impact of the water flow force on the sealed cement concrete slab and the vibration of the water flow force at the bend of the pipe, thus playing a shock absorption role. The upper rubber ring 3 has the same function as the lower rubber ring 5. Since the rubber ring has a sealing function, it can prevent water leakage from the pipe and prevent sewage from the external soil from entering the water supply pipe, thus ensuring the water quality of the water supply pipe.

[0063] (9) Install the upper surrounding sealed cement concrete slab 2. (Refer to...) Figure 14 Before installation, the cement concrete slab is blown clean to ensure the "U" groove is clean. The upper part of the upper rubber ring 3 is heated to a hot-melt state. The "U" groove of the upper side surrounding the sealed cement concrete slab 2 is then flipped onto the upper rubber ring 3 and fixed to ensure that the upper side surrounding the sealed cement concrete slab 2 is installed in place. The grout inlet 6 and grout outlet 7 are then cleared.

[0064] (10) Installation of auxiliary grouting pipe 8. (Refer to...) Figure 15 The auxiliary grouting pipe 8 is made of plastic flexible tubing. The head of the auxiliary grouting pipe 8 is inserted into the grout inlet 6 of the upper, encircling, sealed cement concrete slab 2 and then tightened. The length of the auxiliary grouting pipe 8 is determined according to the burial depth of the pipe bend and a corresponding length is reserved.

[0065] The auxiliary grouting pipe 8 is mainly used to inject cement mortar into the inlet 6 when grouting the upper surrounding sealed cement concrete slab 2. After the upper surrounding sealed cement concrete slab 2 is installed, the soil at the pipe bend is backfilled, and it is difficult to find the inlet 6 of the upper surrounding sealed cement concrete slab 2 after backfilling. Therefore, the auxiliary grouting pipe 8 is installed at the inlet 6 before backfilling. After the soil is backfilled, the grout is injected into the inlet 6 through the auxiliary grouting pipe 8 and then sprayed into the surrounding soil from the outlet 7.

[0066] (11) Backfilling of the upper part of the sealed cement concrete slab 2. After the upper sealed cement concrete slab 2 is installed, backfilling and compacting are carried out at the pipe bends, and the soil is compacted in layers to ensure that the soil is dense.

[0067] (12) Grouting of the upper surrounding sealed cement concrete slab 2. (Refer to...) Figure 16 A pressure pump is used to pressurize the cement mortar. The pressure pump is aimed at the exposed head of the auxiliary grouting pipe 8 for grouting. The injection process is slow. The cement mortar is injected into the grout inlet 6 through the auxiliary grouting pipe 8 and flows to the grout outlet 7 through the channel. Due to the pressure of the pressure pump, the cement mortar will be sprayed into the upper soil of the upper closed cement concrete slab 2. The cement mortar will diffuse and harden in the soil.

[0068] (13) Grouting is performed on the gap between the upper and lower sealed cement concrete slabs 2 and 4. Grouting is performed in the auxiliary grouting pipe 8 connected to the gap between the cement concrete slabs. The grout flows through the inlet 6 to the outlet 7 and is injected into the gap between the upper and lower sealed cement concrete slabs 2 and 4, filling the gap and sealing the two cement concrete slabs.

[0069] (14) Pull out the auxiliary grouting pipe 8. After grouting is completed, use a pulling tool to pull out the auxiliary grouting pipe 8, and fill the remaining ducts of the grouting pipe with grout using a grouting pump.

[0070] It is worth mentioning that the cement mortar is pressurized by a pressure pump. For the grout inlet 6 surrounding the upper sealed cement concrete slab 2, it needs to be injected into the grout inlet 6 using an auxiliary grouting pipe 8, and then sprayed out at the outlet 7. For the lower sealed cement concrete slab 4 surrounding the pipe, it can be directly injected into the grout inlet 6 using a pressure pump. After the cement mortar is sprayed out from the outlet 7, it forms cement-stabilized soil with the soil around the pipeline. When the soil and cement mortar combine, they form cement-stabilized soil with good water stability, which can improve the strength of the soil around the pipeline and effectively prevent the risk of soil erosion and soil collapse. At the same time, the formation of high-strength soil around the water supply pipeline is beneficial for shock absorption and load bearing, and effectively improves the durability of the pipeline bends.

[0071] This invention proposes to arrange an upper-side and lower-side sealed cement concrete slab 2 and 4, which can be spliced ​​vertically, at the bend of a pipe. The upper and lower sealed cement concrete slabs 4 effectively resist the impact of water flow, reducing the vibration caused by water impacting the water supply pipe, thus achieving a shock absorption effect. Since the upper-side sealed cement concrete slab 2, together with the lower-side sealed cement concrete slab 4, forms a wall around the pipe bend, it also provides a waterproof seal, reducing the risk of leakage at the bend.

[0072] Upper and lower rubber rings are installed at pipe bends. These rubber rings are located within the "U"-shaped plate surrounding the sealed cement concrete slab. The rubber rings are flexible materials, serving as a flexible transition between the water supply steel pipe and the surrounding sealed cement concrete slab. Their function is to resist the vibration force of the water flow, reducing the impact of the water flow on the steel pipe, as well as the impact of the water flow on the surrounding sealed cement concrete slab, and reducing vibration at the pipe bend, thus playing a shock-absorbing role. Because the rubber rings provide a seal, they prevent water leakage and prevent sewage from external soil from entering the water supply pipeline, ensuring the water quality of the water supply.

[0073] A grout inlet 6 and a grout outlet 7 are provided around a sealed cement concrete slab. The grout inlet 6 is used to inject pressurized cement mortar, which is then sprayed out through internal channels at the grout outlet 7. This grouting is injected into the soil surrounding the water supply pipeline, reinforcing and compacting the soil. This ensures a dense, load-bearing structure around the pipeline, reducing vibrations at bends, minimizing leakage risks, and improving durability. The application utilizes two concrete slabs and grouting to form cement-stabilized soil, effectively mitigating settlement, lateral displacement, and vibration of the water supply pipeline caused by soil subsidence. The grout outlet 7 is where cement mortar is injected under high pressure through the grout inlet 6 and sprayed out through internal channels. The cement mortar is then sprayed into the surrounding soil, bonding with it to form cement-stabilized soil, further reinforcing the soil and preventing soil loss around the pipeline due to seepage. A portion of the grout outlet 7 is located at the junction of the upper and lower sealed cement concrete slabs 2 and 4. When grouting is performed, the cement mortar fills the junction of the two slabs, sealing the gap between the upper and lower slabs, thus connecting them into a whole and preventing seepage.

[0074] The placement of bends in the pipes facilitates the transfer of water flow impact force from the steel pipe to the concrete slab at the bend, resulting in a smoother transition of water flow force. This reduces vibration and facilitates the precise installation of the concrete slab and steel pipe, thereby increasing construction speed.

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0076] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A construction method for a grouting-type sealing and vibration-damping treatment at bends in buried water supply pipelines, characterized in that... Includes the following steps: S1. The upper and lower sides are prefabricated with sealed cement concrete slabs, with reserved grout inlet and outlet. S2. Excavate the pipe trench at the bend; S3. Install a sealed cement concrete slab around the lower side of the pipe trench at the bend; S4. The lower half of the rubber ring is hot-melt installed on the sealed cement concrete slab on the lower side; S5. Grout the lower side of the sealed cement concrete slab through the grout inlet; S6. Install the bent pipe so that it fits tightly against the lower half of the rubber ring on the lower side of the sealed cement concrete slab, and heat-melt the bent pipe to the lower half of the rubber ring. S7. The upper half of the rubber ring is heat-fused and installed on the bent pipe, and the upper half of the rubber ring and the lower half of the rubber ring are heat-fused together to form a whole; S8. An upper-side sealed cement concrete slab is installed on the bent pipe, wherein the upper-side sealed cement concrete slab is heat-fused to the upper half rubber ring, and the upper-side sealed cement concrete slab and the lower-side sealed cement concrete slab are tightly attached to each other. S9. Install an auxiliary grouting pipe on the grout inlet of the upper closed-type cement concrete slab; S10. Backfill the upper part of the upper part of the sealed cement concrete slab surrounding the upper side with soil. S11. Grout the upper surrounding sealed cement concrete slab through the grout inlet; S12. After grouting is completed, pull out the auxiliary grouting pipe; In step S1, both the upper and lower closed-circle cement concrete slabs are U-shaped. The grout inlet is located on the upper side of the upper and lower closed-circle cement concrete slabs, and the grout outlet is located on the lower side and both sides of the upper and lower closed-circle cement concrete slabs. The outer dimensions of the concrete slab are determined using steel formwork. 8mm diameter steel bars are added to the concrete slab in a longitudinal and transverse arrangement. Plastic sleeves are used as reserved channels for the grout inlet and outlet. C20 concrete is used for pouring and curing. Then, the formwork is removed and the plastic sleeves of the channels are removed.

2. The construction method for a circumferential grouting sealing and vibration damping treatment at the bend of a buried water supply pipeline according to claim 1, characterized in that, In step S3, the trench on both sides of the bend is widened by 200mm on each side to facilitate the placement of the cement concrete slab. The soil on the slope is compacted, and the lower side of the sealed cement concrete slab is installed on the slope bend. The grout inlet and outlet are cleared.

3. The construction method for a circumferential grouting sealing and vibration damping treatment at the bend of a buried water supply pipeline according to claim 1, characterized in that, In step S5, a pressure pump is used to pressurize the cement mortar. The pressure pump is aimed at the grout inlet of the lower side of the sealed cement concrete slab and injects the cement mortar. The injection process is slow. The cement mortar flows through the channel to the grout outlet. Due to the pressure of the pressure pump, the cement mortar will be sprayed into the bottom soil of the lower side of the sealed cement concrete slab through the grout outlet and continuously grouting. The cement mortar diffuses in the soil and hardens with time.

4. The construction method for a circumferential grouting sealing and vibration damping treatment at the bend of a buried water supply pipeline according to claim 1, characterized in that, In step S7, after the upper half of the rubber ring is heat-fused onto the pipe, a heat-fusion machine is used to heat and fuse the area where the lower half of the rubber ring and the upper half of the rubber ring are connected, so that the opening parts of the two are connected as a whole through heat fusion.

5. The construction method for a circumferential grouting sealing and vibration damping treatment at the bend of a buried water supply pipeline according to claim 1, characterized in that, In step S9, the auxiliary grouting pipe is a plastic flexible tube. The head of the auxiliary grouting pipe is inserted into the grout inlet of the upper closed-type cement concrete slab and tightened. The length of the auxiliary grouting pipe is determined according to the burial depth of the pipe bend and the corresponding length is reserved.

6. The construction method for surrounding grouting sealing and vibration damping treatment at bends in buried water supply pipelines according to claim 1, characterized in that, In step S11, a pressure pump is used to pressurize the cement mortar. The pressure pump is aimed at the exposed head of the auxiliary grouting pipe for grouting. The injection process is slow. The cement mortar is injected into the inlet through the auxiliary grouting pipe and flows to the outlet through the channel. Due to the pressure of the pressure pump, the cement mortar will be sprayed into the upper soil of the upper surrounding closed cement concrete slab through the outlet. The cement mortar undergoes diffusion hardening in the soil.

7. The construction method for surrounding grouting sealing and vibration damping treatment at bends in buried water supply pipelines according to claim 1, characterized in that, In step S11, during the grouting process, the grout flows from the inlet to the outlet and is injected into the gap between the upper and lower surrounding sealed cement concrete slabs, filling the gap and sealing the two cement concrete slabs.

8. The construction method for surrounding grouting sealing and vibration damping treatment at bends in buried water supply pipelines according to claim 1, characterized in that, In step S12, after grouting is completed, the auxiliary grouting pipe is pulled out using a pulling tool, and the remaining ducts of the grouting pipe are filled with grout using a grouting pump.

9. The construction method for a circumferential grouting sealing and vibration damping treatment at the bend of a buried water supply pipeline according to claim 1, characterized in that, The diameter of both the slurry inlet and outlet is 20 mm.

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