Construction method of coastal high-water-pressure pipeline based on UHPC (Ultra High Performance Concrete)
By using UHPC materials and freezing and grouting technology to carry out pipeline construction in coastal areas, the collapse problem caused by formation instability is solved, and the construction safety and long life of the pipeline corridor are achieved.
Patent Information
- Application Number
- CN202510334695.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-20
- Publication Date
- 2025-06-06
AI Technical Summary
When underground pipeline construction is carried out in coastal areas, the instability and high water content of the formation lead to soil flow, making it easy to collapse problems.
Using UHPC-based construction method, through the freezing and grouting technology, a frozen layer is formed and the pipe corridor is laid under it to avoid collapse. After the laying is completed, waterproof slurry is injected into the outer wall of the pipe corridor to form a protective film.
It effectively avoids collapse during construction, extends the service life of the pipe corridor, and reduces the impact of construction on the ground and soil.
Smart Images
Figure CN120100958A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of pipe network construction, and in particular to a construction method of a coastal high-pressure pipe based on UHPC. Background Art
[0002] At present, the underground pipeline construction in many areas is often carried out by the method of dark excavation and jacking construction. Dark excavation and jacking construction can minimize the impact on ground facilities. However, for the strata in coastal areas (where the water content and sand content of the strata are relatively high), the stability of the strata themselves is relatively poor, and the land has greater fluidity when it loses support. Therefore, when dark excavation and jacking construction are carried out, the soil is prone to flow. When the soil flows during the jacking operation, collapse is likely to occur. Summary of the invention
[0003] In view of the above problems, the present invention proposes a construction method for coastal high-pressure pipelines based on UHPC, which adopts the freezing and grouting method, which can effectively avoid collapse during the construction process. After the laying of the pipeline corridor is completed, the entire pipeline corridor is relatively less affected by the environment, and the corrosion and aging rate is relatively slow.
[0004] The technical solution adopted by the present invention is as follows:
[0005] A construction method for a coastal high-pressure pipeline based on UHPC, comprising the following steps:
[0006] A freezing step, using a pipe-breaking method combined with cryogenic liquid freezing to form a frozen layer on the ground surface, the thickness of the frozen layer being not less than 2 meters;
[0007] An excavation step is to excavate an operating well on the ground surface, and in the operating well, a UHPC (a high-performance cement) pipe is pushed into the soil by a pipe jacking machine, and the UHPC pipes are connected to form a pipe gallery, and the pipe gallery is located below the frozen layer and does not contact the frozen layer;
[0008] In the grouting step, after the pipe gallery is spliced, waterproof slurry is injected into the outer wall of the pipe gallery through the grouting holes on the UHPC pipes. After the waterproof slurry solidifies, it is coated on the outer wall of the pipe gallery.
[0009] In this construction method, for coastal areas where the water content and sand content of the strata are relatively high, the upper soil layer is first frozen by the freezing method. After the upper soil layer is frozen, it forms a frozen layer itself. The existence of this frozen layer forms a plate on the surface of the stratum, and the thickness of the plate itself is not less than 2 meters. Therefore, even if the soil below the surface flows during the jacking operation, the problem of surface collapse can still be avoided.
[0010] In this method, during the pipe jacking operation, the UHPC pipe does not contact the frozen layer, so the frozen layer will not hinder the advancement of the UHPC pipe and the tunneling head during the pipe jacking operation, ensuring that the resistance encountered during the tunneling operation is small and the pipe jacking operation is smoother. In addition, due to the existence of the frozen layer above, the downward movement and settlement of the soil during the tunneling process can be reduced, thereby reducing the pressure encountered during the tunneling process.
[0011] At the same time, in this method, since the freezing method is used to reinforce the soil layer, after the jacking operation is completed, the soil will thaw after losing the cold source. This freezing reinforcement method has little impact on the ecological diversity of the soil, which is convenient for the rapid recovery of the ecological diversity of the soil after construction. At the same time, after thawing, there is basically no impact on the mechanical structure of the soil, and after the construction is completed, there is little impact on the surrounding ground buildings.
[0012] At the same time, in this method, after the underground pipe gallery is laid using the jacking method, the grouting holes on the UHPC pipes are used to inject grout outside the pipe gallery. After the slurry solidifies, a circle of anti-corrosion protective film is formed outside the pipe gallery, which can effectively slow down the corrosion and aging speed of the pipe gallery. In this way, even if the salt content in the soil is relatively high, the pipe gallery laid using this construction method can still ensure that the entire pipe gallery has a relatively long service life.
[0013] In summary, this construction method, which adopts the method of freezing and grouting, can effectively avoid collapse during the construction process. After the laying of the pipeline corridor is completed, the entire pipeline corridor is relatively less affected by the environment, and the rate of corrosion and aging is relatively slow.
[0014] Optionally, the outer wall of the UHPC pipe is coated with a two-component polyurethane anti-corrosion coating.
[0015] The outer wall of the UHPC pipe is coated with a two-component polyurethane anti-corrosion coating to further improve the anti-corrosion performance of the pipeline corridor.
[0016] Optionally, the inner wall of the UHPC pipe is coated with an epoxy resin coating.
[0017] The inner wall of the UHPC pipe is coated with an epoxy resin coating to prevent the substances in the pipe gallery from corroding the pipe gallery.
[0018] Optionally, a sealing rubber ring gasket is provided between two adjacent UHPC pipes.
[0019] The function of the sealing rubber ring gasket is to seal between two pipes.
[0020] Optionally, the UHPC pipe contains two circles of steel mesh.
[0021] The pipe is made of two circles of steel mesh and UHPC casting, which ensures that the entire pipe has good anti-extrusion ability.
[0022] Optionally, the UHPC pipe is a cylindrical pipe.
[0023] Optionally, the slurry includes 15-25 parts of acrylate monomer, 0.5-2 parts of ammonium persulfate, 0.1-0.5 parts of triethanolamine, 0.1-0.3 parts of N,N-methylenebisacrylamide, 0.05-0.1 parts of ferrous sulfate, 2-4 parts of glycerol, and 65-85 parts of deionized water.
[0024] In the slurry of the above components, the grouting layer formed after the slurry is completely solidified is gel-like, so after the grouting is completed, a layer of gel-like coating can be formed on the outer wall of the corridor. This layer of gel-like coating can play an effective waterproof role and prevent the outer wall of the corridor from being corroded. Similarly, after the slurry solidifies, the slurry gradually solidifies during the seepage process and finally forms a branch structure similar to tree roots. This structure can fully contact the soil, so the existence of this gel-like grouting layer can greatly increase the friction between the soil and reduce the settlement of the corridor.
[0025] It should be noted that the ratio of each component in the slurry is calculated by mass.
[0026] Optionally, the thickness of the waterproof slurry after solidification is less than the wall thickness of the UHPC pipe.
[0027] The beneficial effects of the present invention are: the freezing and grouting method is adopted, which can effectively avoid collapse during the construction process, and after the pipeline corridor is laid, the entire pipeline corridor is relatively less affected by the environment, and the corrosion and aging rate is relatively slow. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.
[0029] Figure 1 This is a schematic diagram of the construction process of a coastal high-pressure water pipeline based on UHPC;
[0030] Figure 2 This is a schematic diagram of the status after the construction of the pipeline corridor is completed.
[0031] The reference numerals in the figure are: 1. frozen layer; 2. grouting layer; 3. two-component polyurethane anti-corrosion coating; 4. UHPC pipe; 5. epoxy resin coating. DETAILED DESCRIPTION
[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.
[0033] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
[0034] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.
[0035] Combined with Figure 1 And attached Figure 2 As shown, a construction method of a coastal high-pressure pipeline based on UHPC includes the following steps:
[0036] S1 (freezing step) uses a pipe-drilling combined with cryogenic liquid freezing method to form a frozen layer 1 on the surface, and the thickness of the frozen layer 1 is not less than 2 meters; the cryogenic liquid used during freezing is low-temperature brine, and the specific freezing construction process is carried out in accordance with the "Anti-freezing Design Standard for Hydraulic Structures" (GB / T50662-2011, 2025 revised edition).
[0037] S2 (excavation step), excavating an operating well on the ground surface, and pushing UHPC (a high-performance cement) pipes into the soil in the operating well by using a pipe jacking machine, and the UHPC pipes 4 are connected to form a pipe gallery, which is located below the frozen layer 1 and does not contact the frozen layer 1;
[0038] S3 (grouting step): after the pipe gallery is spliced, waterproof slurry is injected into the outer wall of the pipe gallery through the grouting holes on the UHPC pipe 4. After the waterproof slurry solidifies, it is coated on the outer wall of the pipe gallery.
[0039] In this construction method, for coastal areas where the water content and sand content of the strata are relatively high, the upper soil layer is first frozen by freezing. After the upper soil layer is frozen, it forms a frozen layer 1. The existence of the frozen layer 1 forms a plate on the surface of the stratum, and the thickness of the plate itself is not less than 2 meters. Therefore, even if the soil below the surface flows during the jacking operation, the problem of surface collapse can still be avoided.
[0040] In this method, when the pipe jacking operation is carried out, the UHPC pipe 4 does not contact the frozen layer 1, so that the frozen layer 1 will not hinder the advancement of the UHPC pipe 4 and the tunneling head during the pipe jacking operation, ensuring that the resistance encountered during the tunneling operation is small, ensuring that the pipe jacking operation is smoother, and due to the existence of the frozen layer 1 above, the downward movement and settlement of the soil during the tunneling process can be reduced, thereby reducing the pressure encountered during the tunneling process.
[0041] At the same time, in this method, since the freezing method is used to reinforce the soil layer, after the jacking operation is completed, the soil will thaw after losing the cold source. This freezing reinforcement method has little impact on the ecological diversity of the soil, which is convenient for the rapid recovery of the ecological diversity of the soil after construction. At the same time, after thawing, there is basically no impact on the mechanical structure of the soil, and after the construction is completed, there is little impact on the surrounding ground buildings.
[0042] At the same time, in this method, after the underground pipe gallery is laid using the pipe jacking method, the grouting holes on the UHPC pipe 4 are used to inject grout outside the pipe gallery. After the slurry solidifies, a circle of anti-corrosion protective film is formed outside the pipe gallery, which can effectively slow down the corrosion and aging speed of the pipe gallery. In this way, even if the salt content in the soil is relatively high, the pipe gallery laid using this construction method can still ensure that the entire pipe gallery has a relatively long service life.
[0043] In summary, this construction method, which adopts the method of freezing and grouting, can effectively avoid collapse during the construction process. After the laying of the pipeline corridor is completed, the entire pipeline corridor is relatively less affected by the environment, and the rate of corrosion and aging is relatively slow.
[0044] In this method, the direction of the jacking pipe can be found in the attached Figure 1 The arrow in the figure indicates the
[0045] Combined with Figure 1 And attached Figure 2 As shown, the outer wall of the UHPC pipe 4 is coated with a two-component polyurethane anti-corrosion coating 3.
[0046] The outer wall of the UHPC pipe 4 is coated with a two-component polyurethane anti-corrosion coating 3 to further improve the anti-corrosion performance of the pipe gallery.
[0047] Combined with Figure 1And attached Figure 2 As shown, the inner wall of the UHPC pipe 4 is coated with an epoxy resin coating 5 .
[0048] The inner wall of the UHPC pipe 4 is coated with an epoxy resin coating 5 to prevent the pipe gallery from being corroded by substances in the pipe gallery.
[0049] Combined with Figure 1 And attached Figure 2 As shown, a sealing rubber ring gasket is arranged between two adjacent UHPC pipes 4 .
[0050] The function of the sealing rubber ring gasket is to seal between two pipes.
[0051] Combined with Figure 1 And attached Figure 2 As shown, the UHPC pipe 4 contains two circles of steel mesh.
[0052] The pipe is made of two circles of steel mesh and UHPC casting, which ensures that the entire pipe has good anti-extrusion ability.
[0053] Combined with Figure 1 And attached Figure 2 As shown, the UHPC pipe 4 is a cylindrical pipe.
[0054] Combined with Figure 1 And attached Figure 2 As shown, the slurry includes 15-25 parts of acrylate monomer, 0.5-2 parts of ammonium persulfate, 0.1-0.5 parts of triethanolamine, 0.1-0.3 parts of N,N-methylenebisacrylamide, 0.05-0.1 parts of ferrous sulfate, 2-4 parts of glycerol, and 65-85 parts of deionized water.
[0055] In the slurry of the above components, the grouting layer 2 formed after the slurry is completely solidified is in a gel state, so after the grouting is completed, a layer of gel-like coating can be formed on the outer wall of the corridor. This layer of gel-like coating can play an effective waterproof role and prevent the outer wall of the corridor from being corroded. Similarly, after the slurry solidifies, the slurry gradually solidifies during the seepage process and finally forms a branch structure similar to tree roots. This structure can fully contact the soil, so the existence of this gel-like grouting layer 2 can greatly increase the friction between the soil and reduce the settlement of the corridor.
[0056] It should be noted that the ratio of each component in the slurry is calculated by mass.
[0057] Combined with Figure 1 And attached Figure 2 As shown, the thickness of the waterproof slurry after solidification is less than the wall thickness of the UHPC pipe 4 .
[0058] In this embodiment, ordinary cement cast pipes may be used to replace the UHPC pipes.
[0059] The above-described embodiments only express some embodiments of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for those skilled in the art, it is still possible to modify the technical solutions recorded in the above-mentioned embodiments, or to replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A construction method for a coastal high-pressure pipeline based on UHPC, characterized in that: The following steps are included: A freezing step, using a pipe-breaking method combined with cryogenic liquid freezing to form a frozen layer on the ground surface, the thickness of the frozen layer being not less than 2 meters; An excavation step is to excavate an operating well on the ground surface, and in the operating well, UHPC pipes are pushed into the soil by a pipe jacking machine, and the UHPC pipes are connected to form a pipe gallery, and the pipe gallery is located below the frozen layer and does not contact the frozen layer; In the grouting step, after the pipe gallery is spliced, waterproof slurry is injected into the outer wall of the pipe gallery through the grouting holes on the UHPC pipes. After the waterproof slurry solidifies, it is coated on the outer wall of the pipe gallery.
2. A construction method for a coastal high-pressure pipeline based on UHPC according to claim 1, characterized in that: The outer wall of the UHPC pipe is coated with a two-component polyurethane anti-corrosion coating.
3. The construction method of a coastal high-pressure pipeline based on UHPC according to claim 1, characterized in that: The inner wall of the UHPC pipe is coated with an epoxy resin coating.
4. The construction method of a coastal high-pressure pipeline based on UHPC according to claim 1, characterized in that: A sealing rubber ring gasket is arranged between two adjacent UHPC pipes.
5. The construction method of a coastal high-pressure pipeline based on UHPC according to claim 1, characterized in that: The UHPC pipe contains two circles of steel mesh.
6. The construction method of a coastal high-pressure pipeline based on UHPC according to claim 1, characterized in that: The UHPC pipe is a cylindrical pipe.
7. The construction method of a coastal high-pressure pipeline based on UHPC according to claim 1, characterized in that: The slurry includes 15-25 parts of acrylate monomer, 0.5-2 parts of ammonium persulfate, 0.1-0.5 parts of triethanolamine, 0.1-0.3 parts of N,N-methylenebisacrylamide, 0.05-0.1 parts of ferrous sulfate, 2-4 parts of glycerol, and 65-85 parts of deionized water.
8. A method for constructing a coastal high-pressure pipeline based on UHPC according to claim 7, characterized in that: The thickness of the waterproof slurry after solidification is less than the wall thickness of the UHPC pipe.