Efficient water conveying pipeline and manufacturing method and construction method thereof

Abstract

The efficient water conveying pipeline is characterized in that the efficient water conveying pipeline comprises a steel pipe, prefabricated concrete pipe pieces are arranged on the outer surface of the steel pipe, grouting holes are evenly distributed in the peripheral surface of the steel pipe, and the prefabricated concrete pipe pieces are provided with embedded pipes in one-to-one correspondence with the grouting holes; a self-compacting grouting layer is arranged on the outer side wall of the prefabricated concrete pipe piece through grouting. Compared with a conventional water pipe lined with a steel pipe, the prefabricated concrete pipe piece effectively wraps the steel pipe, and the thickness of the steel pipe and the use amount of materials can be reduced; the preloaded pressure is applied to the prefabricated concrete pipe piece, cracking of the prefabricated concrete pipe piece can be relieved, and when the preloaded pressure is larger than the concrete pipe piece tensile stress caused by the internal water pressure borne by the efficient water conveying pipeline, it can be guaranteed that the concrete pipe piece does not crack.

Description

Technical Field

[0001] The invention relates to a high-efficiency water delivery pipeline and a manufacturing method and a construction method thereof, belonging to the technical field of water conservancy and hydropower equipment. Background Art

[0002] The existing pressurized water pipelines are usually in two forms: concrete lining and steel pipe lining. However, the traditional concrete lining is easy to crack, and the cracked penetration will cause water head loss.

[0003] The construction process of traditional water pipelines is tunnel excavation and support, concrete formwork and pouring. Steel pipe lining usually needs to be welded on site, and backfill grouting requires drilling and grouting of steel pipes before welding and sealing. Holes and welds are prone to corrosion, creating weak links. Backfill grouting uses conventional concrete and requires vibration, but in order to reduce damage to the steel pipe lining, the number of holes is generally limited, making it difficult to vibrate densely. After the backfill grouting and the steel pipe are emptied, the internal water pressure on the steel pipe cannot be transmitted to the surrounding rock through the backfill grouting layer, posing a high safety risk. Summary of the invention

[0004] The purpose of the present invention is to provide an efficient water pipeline and a construction method, and also to provide a method for manufacturing the efficient water pipeline and a construction method for the efficient water pipeline. The present invention can ensure that the concrete pipe segment does not crack, solve the leakage problem after the concrete lining cracks, improve the reliability of pipeline transportation, eliminate the head loss, and simplify the construction process.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: an efficient water supply pipeline, comprising a steel pipe, the outer surface of the steel pipe is provided with a precast concrete pipe segment, the surface of the steel pipe is evenly distributed with grouting holes, the precast concrete pipe segment is provided with embedded pipes corresponding to the grouting holes one by one, and the outer side wall of the precast concrete pipe segment is provided with a self-compacting grouting layer through grouting.

[0006] In the aforementioned high-efficiency water delivery pipeline, the precast concrete segments are provided with steel bars, both ends of the steel bars extend out of both ends of the precast concrete segments, and the length of the steel bars is the same as the length of the steel pipe.

[0007] In the aforementioned efficient water pipeline, the length of the steel pipe and the prefabricated concrete pipe segment is ≤12m, which is the maximum length that can be transported by a conventional transport vehicle.

[0008] In the aforementioned high-efficiency water pipeline, three grouting holes are arranged on the same cross section of the steel pipe, the three grouting holes are evenly distributed along the cross section of the steel pipe, and the diameter of the grouting holes is 30mm-50mm.

[0009] The aforementioned high-efficiency water pipeline, wherein the inner wall of the steel pipe is provided with an anti-corrosion layer.

[0010] A method for manufacturing an efficient water delivery pipeline comprises the following steps:

[0011] A. Use high-strength steel plates to roll and weld into steel pipes, and evenly set three holes along the inner wall of the steel pipe;

[0012] B. Using the steel pipe in step A as the inner lining template, prefabricated concrete segments are prefabricated in the factory, and pre-buried pipes are preset at the prefabricated concrete segments at the corresponding positions of the three holes in the steel pipe, and the pre-buried pipes are exposed from the prefabricated concrete segments;

[0013] C. Apply anti-corrosion coating on the inner wall of the steel pipe.

[0014] In the aforementioned method for manufacturing an efficient water supply pipeline, in step B, pre-pressure can be applied to the precast concrete segments, and whether to equip them with steel bars is determined based on the water pressure to be borne by the specific project. The steel bars in the precast concrete segments protrude from the precast concrete segments and are the same length as the steel pipes.

[0015] A construction method for an efficient water pipeline, the specific steps are as follows:

[0016] S1: After the tunnel is formed by blasting or TBM, anchors are driven into the tunnel surrounding rock to reinforce the surrounding rock;

[0017] S2: spraying concrete on the surrounding rock for reinforcement;

[0018] S3: transport high-efficiency water pipelines into the cave;

[0019] S4: At the preset openings of the steel pipe, self-compacting concrete is used for backfill grouting to form a self-compacting grouting layer between the surrounding rock after spraying concrete and the prefabricated concrete segments.

[0020] S5: Connect multiple high-efficiency water delivery pipelines, connect the steel bars of two pipelines by sleeve connection or welding, weld the steel pipes, and finally fill the gaps of the precast concrete segments at the joints by on-site pouring to complete the connection;

[0021] S6: Repeat steps S3-S5 until the construction of all high-efficiency water pipes is completed.

[0022] In the above-mentioned construction method of a high-efficiency water pipeline, in step S4, after the grouting is completed, it is ensured that the grouting completely fills the pre-buried pipe and the steel pipe opening, and the inner wall of the steel pipe is smoothed.

[0023] In the aforementioned construction method of a high-efficiency water pipeline, after the inner wall of the steel pipe is ground and the high-efficiency water pipeline is connected, a supplementary anti-corrosion coating is applied to the inner wall of the steel pipe.

[0024] Compared with the prior art, the present invention has at least the following beneficial effects:

[0025] (1) Compared with conventional steel pipe lined water pipelines, the provision of prefabricated concrete segments in the water pipeline of the present invention reduces the workload of on-site backfill grouting;

[0026] (2) Compared with conventional steel pipe lined water pipes, the water pipes of the present invention have precast concrete segments that effectively wrap the steel pipes, which can reduce the thickness of the steel pipes and the amount of materials used; and the application of pre-pressure in the precast concrete segments can slow down the cracking of the precast concrete segments. When the pre-pressure is greater than the tensile stress of the concrete segments caused by the internal water pressure borne by the high-efficiency water pipe, the concrete segments can be guaranteed not to crack;

[0027] (3) Compared with conventional concrete lining, the presence of steel pipes in the present invention solves the leakage problem after the concrete lining cracks, improves the reliability of pipeline transportation, and eliminates head loss;

[0028] (4) The water pipeline of the present invention is prefabricated in the factory, and the workload on site is small, which can reduce the labor cost on site, shorten the construction period, and improve the construction efficiency. At the same time, the prefabricated concrete pipe segments prefabricated in the factory can ensure the quality of the finished product compared with the traditional on-site casting.

[0029] (5) The backfill grouting during the construction of the water pipeline of the present invention adopts self-compacting concrete. Compared with traditional concrete, self-compacting concrete has higher fluidity and does not require vibration, which greatly simplifies the construction process.

[0030] (6) The opening of the steel pipe of the present invention is filled with self-compacting concrete. Even if reinforcement welding is performed to seal the opening, an effective seal is formed on the outside of the weld, and no further leakage problem will occur at the hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic cross-sectional view of a water delivery pipeline of the present invention;

[0032] Figure 2 It is a cross-sectional view of the water pipeline construction and installation structure of the present invention;

[0033] Figure 3 The present invention Figure 2 The enlarged schematic diagram at A in the middle;

[0034] Figure 4 It is a schematic diagram of the steel pipe, prefabricated concrete pipe segment and steel bar installation structure in the present invention.

[0035] Figure numerals: 1-steel pipe, 2-prefabricated concrete segment, 3-grouting hole, 4-self-compacting grouting layer, 5-rebar, 6-anchor rod, 7-surrounding rock, 8-concrete spraying layer, 9-embedded pipe.

[0036] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. DETAILED DESCRIPTION

[0037] Embodiment 1 of the present invention: A high-efficiency water supply pipeline comprises a steel pipe 1, the outer surface of the steel pipe 1 is provided with a precast concrete pipe segment 2, the surface of the steel pipe 1 is evenly distributed with grouting holes 3, the precast concrete pipe segment 2 is provided with embedded pipes 9 corresponding to the grouting holes 3 one by one, and the outer wall of the precast concrete pipe segment 2 is provided with a self-compacting grouting layer 4 through grouting. Compared with the conventional steel pipe lined water supply pipeline, the provision of the precast concrete pipe segment 2 reduces the workload of on-site backfill grouting, and the precast concrete pipe segment 2 forms an effective wrapping for the steel pipe 1, which can reduce the thickness of the steel pipe 2 and the material consumption.

[0038] Embodiment 2 of the present invention: A high-efficiency water pipeline comprises a steel pipe 1, the outer surface of the steel pipe 1 is provided with a precast concrete pipe segment 2, the surface of the steel pipe 1 is evenly distributed with grouting holes 3, the precast concrete pipe segment 2 is provided with embedded pipes 9 corresponding to the grouting holes 3, the outer wall of the precast concrete pipe segment 2 is provided with a self-compacting grouting layer 4 through grouting, and the precast concrete pipe segment 2 is equipped with steel bars 5, the two ends of the steel bars 5 extend out of the two ends of the precast concrete pipe segment 2, and the length of the steel bars 5 is the same as the length of the steel pipe 1. Compared with conventional steel pipe lined water pipelines, the provision of the precast concrete pipe segment 2 reduces the workload of on-site backfill grouting, and the precast concrete pipe segment 2 forms an effective wrapping for the steel pipe 1, which can reduce the thickness of the steel pipe 2 and the amount of materials used.

[0039] Among them, the length of the steel pipe 1 and the prefabricated concrete pipe segment 2 is ≤12m, which is convenient for transportation. 12m is the maximum length that can be transported by a conventional transport vehicle. There are three grouting holes 3 on the same cross section of the steel pipe 1. The three grouting holes 3 are evenly distributed along the cross section of the steel pipe 1, and the diameter of the grouting holes 3 is 30mm-50mm.

[0040] Specifically, the inner wall of the steel pipe 1 is provided with an anti-corrosion layer.

[0041] Embodiment 3 of the present invention: A method for manufacturing an efficient water delivery pipeline, comprising the following steps:

[0042] A. High-strength steel plates are rolled and welded into a steel pipe 1. Three holes are evenly arranged along the inner wall of the steel pipe 1, which are grouting holes 3.

[0043] B. According to the steel pipe 1 in step A, a prefabricated concrete segment 2 is prefabricated in the factory as the inner lining template, and pre-buried pipes 9 are preset at the prefabricated concrete segment 2 at the corresponding positions of the three holes of the steel pipe 1, and the pre-buried pipes 9 are exposed from the prefabricated concrete segment 2;

[0044] Pre-pressure can be applied to the precast concrete segment 2. The application of pre-pressure in the precast concrete segment 2 can slow down the cracking of the precast concrete segment 2. When the pre-pressure is greater than the tensile stress of the concrete segment caused by the internal water pressure borne by the high-efficiency water supply pipeline, the concrete segment can be ensured not to crack. Whether to equip the steel bar 5 is determined according to the water pressure borne by the specific project. The steel bar 5 in the precast concrete segment 2 protrudes out of the precast concrete segment 2 and is the same length as the steel pipe 1.

[0045] C. Apply anti-corrosion coating on the inner wall of steel pipe 1.

[0046] Embodiment 4 of the present invention: A construction method for an efficient water delivery pipeline, the specific steps are as follows:

[0047] S1: After the tunnel is formed by blasting or TBM, anchor rods 6 are driven into the tunnel surrounding rock to reinforce the surrounding rock 7;

[0048] S2: spraying concrete on the surrounding rock for reinforcement to form a concrete spraying layer 8;

[0049] S3: transport high-efficiency water pipelines into the cave;

[0050] S4: At the preset opening of the steel pipe 1, self-compacting concrete is used for backfill grouting to form a self-compacting grouting layer between the surrounding rock 7 after spraying concrete and the precast concrete segment 2, that is, a self-compacting grouting layer 4 is formed between the concrete spraying layer 8 and the precast concrete segment 2.

[0051] S5: Connect multiple high-efficiency water pipelines, connect the steel bars 5 of two pipelines by sleeve connection or welding, weld the steel pipes 1, and finally fill the gaps of the precast concrete segments 2 at the joints by pouring on site to complete the connection;

[0052] S6: Repeat steps S3-S5 until the construction of all high-efficiency water pipes is completed.

[0053] Embodiment 5 of the present invention: A construction method for an efficient water delivery pipeline, the specific steps are as follows:

[0054] S1: After the tunnel is formed by blasting or TBM, anchor rods 6 are driven into the tunnel surrounding rock to reinforce the surrounding rock 7;

[0055] S2: spraying concrete on the surrounding rock for reinforcement to form a concrete spraying layer 8;

[0056] S3: transport high-efficiency water pipelines into the cave;

[0057] S4: At the preset opening of the steel pipe 1, self-compacting concrete is used for backfill grouting, and a self-compacting grouting layer is formed between the surrounding rock 7 after spraying concrete and the precast concrete segment 2, that is, a self-compacting grouting layer 4 is formed between the concrete spraying layer 8 and the precast concrete segment 2. After the grouting is completed, it is ensured that the grouting completely fills the embedded pipe 9 and the grouting hole 3, and the inner wall of the steel pipe 1 is smoothed.

[0058] S5: Connect multiple high-efficiency water pipelines, connect the steel bars 5 of two pipelines by sleeve connection or welding, weld the steel pipes 1, and finally fill the gaps of the precast concrete segments 2 at the joints by pouring on site to complete the connection;

[0059] S6: Repeat steps S3-S5 until the construction of all high-efficiency water pipes is completed.

[0060] Specifically, after the inner wall of the steel pipe 1 is ground and the high-efficiency water pipeline is connected, a supplementary anti-corrosion coating is applied to the inner wall of the steel pipe 1 .

[0061] The working principle of an embodiment of the present invention: The high-efficiency water delivery pipeline of the present invention is composed of three parts: a steel pipe, a prefabricated concrete pipe segment, and a self-compacting grouting layer.

[0062] During preparation: high-strength steel plates are rolled and welded into steel pipes. After the steel pipes are welded, they are used as lining templates, and then prefabricated concrete segments are prefabricated in the factory. Prefabricated concrete segments are subjected to pre-pressure, and whether to provide reinforcement depends on the water pressure that the specific project is subjected to. Three holes are evenly arranged along the inner wall of the steel pipe, and three embedded pipes are preset at corresponding positions and evenly distributed along the outer wall of the steel pipe. The embedded pipes are exposed from the prefabricated concrete segments. The inner wall of the steel pipe is coated with an anti-corrosion coating, and the side in contact with the prefabricated concrete segment does not need to be coated, and the preparation is completed.

[0063] During construction: after the tunnel is formed by blasting or TBM, the conventional anchor spraying process is used to reinforce the tunnel to ensure the stability of the excavation surface; the high-efficiency water pipeline is transported into the tunnel. Considering the heavy weight of the pipeline, a track can be set up in the tunnel for transportation; at the preset openings in the steel pipe, self-compacting concrete is used for backfill grouting. After the grouting is completed, it is ensured that the grouting completely fills the embedded pipes and steel pipe openings, and the inner wall of the steel pipe is smoothed; at the joints of the two water pipelines, the protruding steel bars are connected by sleeves or welding, and then the steel pipes are welded, and finally the joints are cast on site to fill the gaps of the precast concrete segments; finally, the anti-corrosion coating is applied to the inner wall of the steel pipe.

Claims

1. A high-efficiency water pipeline, characterized in that: It comprises a steel pipe, the outer surface of which is provided with a prefabricated concrete pipe segment, grouting holes are evenly distributed on the surface of the steel pipe, the prefabricated concrete pipe segment is provided with embedded pipes corresponding to the grouting holes one by one, and the outer side wall of the prefabricated concrete pipe segment is provided with a self-compacting grouting layer through grouting.

2. The high-efficiency water pipeline according to claim 1, characterized in that: The precast concrete pipe segment is provided with steel bars, both ends of which extend out of the two ends of the precast concrete pipe segment, and the length of the steel bars is the same as the length of the steel pipe.

3. The high-efficiency water pipeline according to claim 2, characterized in that: The length of the steel pipe and the prefabricated concrete pipe segment is ≤12m.

4. The high-efficiency water pipeline according to claim 3, characterized in that: The steel pipe is provided with three grouting holes on the same cross section, the three grouting holes are evenly distributed along the cross section of the steel pipe, and the diameter of the grouting holes is 30mm-50mm.

5. The high-efficiency water pipeline according to claim 4, characterized in that: The inner wall of the steel pipe is provided with an anti-corrosion layer.

6. A method for manufacturing a high-efficiency water pipeline as claimed in claims 1 to 5, characterized in that: The following steps are involved: A. Use high-strength steel plates to roll and weld into steel pipes, and evenly set three holes along the inner wall of the steel pipe; B. Using the steel pipe in step A as the inner lining template, prefabricated concrete segments are prefabricated in the factory, and pre-buried pipes are preset at the prefabricated concrete segments at the corresponding positions of the three holes in the steel pipe, and the pre-buried pipes are exposed from the prefabricated concrete segments; C. Apply anti-corrosion coating on the inner wall of the steel pipe.

7. The method for manufacturing a high-efficiency water pipeline according to claim 6, characterized in that: In step B, pre-pressure may be applied to the precast concrete segments, and whether to equip them with steel bars is determined according to the water pressure to be borne by the specific project. The steel bars in the precast concrete segments protrude from the precast concrete segments and are the same length as the steel pipes.

8. A method for constructing a high-efficiency water pipeline as described in claims 1-5, characterized in that: The specific steps are as follows: S1: After the tunnel is formed by blasting or TBM, anchors are driven into the tunnel surrounding rock to reinforce the surrounding rock; S2: spraying concrete on the surrounding rock for reinforcement; S3: transport high-efficiency water pipelines into the cave; S4: At the preset openings of the steel pipe, self-compacting concrete is used for backfill grouting to form a self-compacting grouting layer between the surrounding rock after spraying concrete and the prefabricated concrete segments. S5: Connect multiple high-efficiency water delivery pipelines, connect the steel bars of two pipelines by sleeve connection or welding, weld the steel pipes, and finally fill the gaps of the precast concrete segments at the joints by on-site pouring to complete the connection; S6: Repeat steps S3-S5 until the construction of all high-efficiency water pipes is completed.

9. A construction method for a high-efficiency water pipeline according to claim 8, characterized in that: In step S4, after the grouting is completed, it is ensured that the grouting completely fills the embedded pipe and the steel pipe opening, and the inner wall of the steel pipe is smoothed.

10. A construction method for a high-efficiency water pipeline according to claim 9, characterized in that: After the inner wall of the steel pipe is ground and the high-efficiency water pipeline is connected, a supplementary anti-corrosion coating is applied to the inner wall of the steel pipe.

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