A grouting pipe system for rock-embedded piles in rock-embedded sections of a pipe frame implanted with a pile-first method

Abstract

The present application discloses a grouting pipe system for the rock-embedded section of a jacket-embedded rock pile of the pile-first method, wherein the grouting pipe system delivers grouting material to the annular space between the steel pipe pile and the borehole wall, and the grouting pipe system includes: a primary grouting pipe and a secondary grouting pipe, wherein the elevation of the bottom pipe opening of the primary grouting pipe is higher than the top elevation of the bottom grouting opening, and the bottom pipe opening of the secondary grouting pipe is arranged above the top elevation of the primary grouting pipe; the grouting pipes of the primary grouting pipe and the secondary grouting pipe whose bottom elevations are lower than the bottom elevation of the jacket tip are arranged in an annular space outside the steel pipe pile at a position 1-3m below the bottom elevation of the jacket tip. The grouting pipe system of the present application is easy to process and reasonably designed, which improves the efficiency and quality of grouting construction and ensures the success rate and quality of underwater grouting of the rock-embedded pile.

Description

Technical Field

[0001] The present application belongs to the technical field of offshore wind power foundation construction, and specifically relates to a grouting pipe system for a rock-embedded section of a rock-embedded pile implanted in a conductor frame using a pile-first method. Background Art

[0002] At present, the domestic offshore wind power projects that have been built and are under construction are concentrated in the intertidal zone and offshore shallow waters. Common types of wind turbine foundations include gravity foundations, single pile foundations, pipe frame foundations, and new suction bucket foundations. Since 2018, the development of domestic intertidal and offshore wind power resources has gradually become saturated, and the development trend of offshore wind power has shown a development trend from offshore to offshore, and from shallow water to deep water. In response to the deep sea wind turbine foundation type with complex geology, domestic design institutes have proposed structural types such as large-diameter single pile embedded rock foundation, high pile cap group pile embedded rock foundation, pipe frame foundation pile and suction tube foundation.

[0003] Since 2019, in the offshore wind power projects with a water depth of 20-30 meters that have been tendered in Guangdong, my country, a large number of jacket foundation structures have been designed. In view of the particularity of the geological conditions of some wind farm sites, part of the jacket pile foundation needs to be constructed by rock embedding, and the design proposes an "implanted" rock-embedded pile foundation construction plan. The general construction process of the implanted rock-embedded pile construction is: first set up a construction platform, drive in a steel casing, and after the casing is stabilized, drill the hole with a drilling rig. After drilling to the designed pile bottom elevation, a steel pipe pile is implanted in the hole and fixed. After the bottom of the steel pipe pile is sealed with underwater bottom concrete, the gap between the outer wall of the steel pipe pile and the wall of the drilled hole is filled with underwater non-dispersible grouting material through the underwater grouting process, and then the pile is cut underwater, the jacket is installed, and finally the annular grouting material is poured between the jacket and the steel pipe pile.

[0004] This underwater grouting process faces many problems, such as long grouting pipelines, large grouting volume for a single pile, high risk of grouting pipe blockage, difficulty in controlling the quality of grouting construction, and easy crossing of prefabricated grouting pipes and inner-inserted conductor frame pile legs in the rock-embedded section. For the construction of rock-embedded piles embedded in the conductor frame foundation using the pile-first method, the rationality of the layout of the prefabricated pipes is the key to solving the grouting construction in the rock-embedded section. This application cleverly solves the problem of arranging grouting pipes in the overlap area between the inner-inserted legs of the conductor frame and the steel pipe piles through a special pipeline design, and effectively solves the difficulties in grouting construction in the rock-embedded section during the construction of this process through a special grouting construction process. Summary of the invention

[0005] In view of the shortcomings or deficiencies of the above-mentioned prior art, the technical problem to be solved by the present application is to provide a grouting pipe system for the rock-embedded section of a rock-embedded pile implanted in a conductor frame using the pile-first method. The grouting pipe system is easy to process and has a reasonable design, thereby improving the grouting construction efficiency and grouting quality, and ensuring the success rate and quality of underwater grouting of the rock-embedded pile.

[0006] To solve the above technical problems, this application is implemented through the following technical solutions:

[0007] The present application proposes a grouting pipe system for the rock-embedded section of a pipe-embedded rock pile using the pile-first method, wherein the grouting pipe system delivers grouting material to the annular space between the steel pipe pile and the borehole wall.

[0008] The grouting pipe system comprises: a primary grouting pipe and a secondary grouting pipe, wherein the elevation of the bottom pipe opening of the primary grouting pipe is higher than the top elevation of the bottom sealing grouting opening, and the bottom pipe opening of the secondary grouting pipe is arranged above the top elevation of the primary grouting pipe;

[0009] Part of the grouting pipes whose pipe mouth bottom elevations are lower than the bottom elevation of the jacket tip are arranged in an annular space from the steel pipe pile to the outside of the steel pipe pile at a position 1-3m below the bottom elevation of the jacket tip.

[0010] Furthermore, in the above-mentioned pile-first method conductor frame implanted rock-embedded pile rock-embedded section grouting pipe system, wherein the primary grouting pipe / the secondary grouting pipe are each provided with at least one layer of sub-grouting pipes, wherein the pipe openings of the multiple sub-grouting pipes arranged on the same layer are arranged at an elevation interval of 0.5-1m.

[0011] Furthermore, in the above-mentioned pile-first method conductor frame implanted rock-embedded pile rock-embedded section grouting pipe system, wherein, when the secondary grouting pipe is provided with at least two layers of sub-grouting pipes, from the bottom layer to the top layer, they are the first layer, the second layer ... the Nth layer, wherein N≥3, and the sub-grouting pipes of the second layer and the Nth layer are both provided outside the steel pipe pile and fixed to the steel pipe pile by welding.

[0012] Furthermore, in the above-mentioned pile-first method conductor frame implanted rock-embedded pile rock-embedded section grouting pipe system, when the secondary grouting pipe is provided with two layers of sub-grouting pipes, from the bottom layer to the top layer, they are the first layer and the second layer respectively, wherein the second layer is arranged in the middle position between the bottom pipe mouth elevation and the mud surface elevation of the secondary grouting pipe.

[0013] Furthermore, in the above-mentioned rock-embedded section grouting pipe system of the pile-first method conductor frame implanted rock-embedded pile, the top pipe openings of the primary grouting pipe and the secondary grouting pipe are both flush with the top elevation of the steel pipe pile.

[0014] Furthermore, in the above-mentioned pile-first method conductor frame implanted rock-embedded pile rock-embedded section grouting pipe system, the bottom pipe opening of the primary grouting pipe / the secondary grouting pipe arranged in the steel pipe pile passes through the wall of the steel pipe pile and is connected to the annular space.

[0015] Furthermore, in the above-mentioned pile-first method conductor frame implanted rock-embedded pile rock-embedded section grouting pipe system, the elevation of the bottom pipe opening of the primary grouting pipe is set 0.5-1m higher than the top elevation of the bottom sealing grouting opening; the bottom pipe opening of the secondary grouting pipe is set 0.5-1m above the top elevation of the primary grouting pipe.

[0016] Furthermore, in the above-mentioned pile-first method conductor frame implanted rock-embedded pile rock-embedded section grouting pipe system, when one of the sub-grouting pipes of the primary grouting pipe and the secondary grouting pipe is blocked during the grouting process, other sub-grouting pipes are replaced to continue grouting into the annular space.

[0017] Furthermore, in the above-mentioned pile-first method conductor frame implanted rock-embedded pile rock-embedded section grouting pipe system, first grouting is performed through a primary grouting pipe, and then secondary grouting is performed through a secondary grouting pipe, wherein the secondary grouting is performed after the grouting material of the primary grouting is completely solidified.

[0018] Furthermore, in the above-mentioned pile-first method jacket implanted rock-embedded pile rock-embedded section grouting pipe system, the primary grouting pipe and the secondary grouting pipe first pump water, then pump the pipe lubricating material, and finally pump the grouting material.

[0019] Compared with the prior art, this application has the following technical effects:

[0020] (1) The design and installation of the prefabricated grouting pipe in this application are all carried out before the jacket is shipped, which is convenient for construction, reduces construction costs, and improves grouting safety;

[0021] (2) This application proposes a primary grouting and a secondary grouting method to solve the grouting construction problem of the rock-embedded section of the embedded rock-embedded pile of the jacket with the pile-first method. At the same time, it proposes to set up prefabricated grouting pipes in multiple layers for the primary grouting and the secondary grouting, and the height difference of the grouting pipes in the same layer is 0.5-1m. This grouting pipe design greatly reduces the risk of emergency treatment during the grouting process;

[0022] (3) The present application provides a special arrangement of the grouting pipes in the grouting area of ​​the jacket frame inserted into the steel pipe pile from the inside of the steel pipe pile to the outside of the steel pipe pile, thereby avoiding the problem of the reserved grouting pipes in the steel pipe pile hindering the installation of the jacket frame;

[0023] (4) This application is applicable to the grouting construction of the rock-embedded section of the embedded rock piles of the conductor frame using the pile-first method. It has strong versatility and can effectively reduce the risk of underwater grouting, improve construction efficiency, and ensure project quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0025] Figure 1: Schematic diagram of application scenario of the grouting pipe system of the rock-embedded pile of the jacket implanted with the pile-first method in the present application;

[0026] Figure 2 : Elevation view of the grouting pipe system of the rock-embedded pile of the jacket with the pile method of the present application;

[0027] Figure 3 : The horizontal section cross-section of the grouting pipe system of the rock-embedded pile of the pipe frame implanted with the pile method in this application. DETAILED DESCRIPTION

[0028] The concept, specific structure and technical effects of the present application will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present application.

[0029] like Figures 1 to 3 As shown, in one of the embodiments of the present application, a grouting pipe system for the rock-embedded section of an implanted rock-embedded pile of a conductor frame B using the pile-first method is provided, wherein the grouting pipe system transports grouting material to an annular space 30 between a steel pipe pile A and a borehole wall, and the grouting pipe system comprises: a primary grouting pipe 10 and a secondary grouting pipe 20, wherein the elevation of the bottom pipe mouth of the primary grouting pipe 10 is higher than the elevation of the top elevation of the bottom grouting mouth, and the bottom pipe mouth of the secondary grouting pipe 20 is arranged above the top elevation of the primary grouting pipe 10; the grouting pipes whose bottom pipe mouth elevations of the primary grouting pipe 10 and the secondary grouting pipe 20 are lower than the bottom elevation of the conductor frame B tip, and are arranged at a position 1-3m below the bottom elevation of the conductor frame B tip, and are led from the steel pipe pile A to the annular space 30 outside the steel pipe pile A.

[0030] This embodiment is directed to a special arrangement of the grouting pipe in the grouting area of ​​the jacket B inserted into the steel pipe pile A, which is led from the inside of the steel pipe pile A to the outside of the steel pipe pile A, thereby avoiding the problem that the reserved grouting pipe in the steel pipe pile A hinders the installation of the jacket B.

[0031] This embodiment is equipped with a conductor frame B, a rock-embedded borehole, a steel pipe pile A and a prefabricated grouting pipe (including a primary grouting pipe 10 and a secondary grouting pipe 20). The rock-embedded borehole is constructed by setting up an auxiliary platform, and the drilling rig is lowered after the steel casing is driven; the steel pipe pile A is inserted into the rock-embedded hole, and the steel pipe pile A and the borehole wall form an annular space 30; the prefabricated grouting pipe is welded and fixed on the steel pipe pile A in advance before being shipped from the processing plant.

[0032] The primary grouting pipe 10 and the secondary grouting pipe 20 are both provided with at least one layer of sub-grouting pipes, wherein the pipe openings of the multiple sub-grouting pipes provided on the same layer are provided at an elevation interval of 0.5-1m. This embodiment proposes a primary grouting and secondary grouting method by providing a primary grouting pipe 10 and a secondary grouting pipe 20, and proposes a multi-layer prefabricated sub-grouting pipe for primary grouting and secondary grouting, and the height difference of the grouting pipes on the same layer is 0.5-1m. This grouting pipe design greatly reduces the risk of emergency treatment during the grouting process.

[0033] Among them, in this embodiment, the above-mentioned several grouting pipes in this embodiment are preferably fixed on the steel pipe pile A by welding.

[0034] Preferably, the pipe openings of the plurality of sub-grouting pipes arranged on the same layer are arranged at an elevation interval of 0.5 m.

[0035] Preferably, the pipe openings of the plurality of sub-grouting pipes arranged on the same layer can be evenly arranged along the circumference, and are arranged at intervals of 0.5-1m in elevation. For example, when two sub-grouting pipes are arranged on the same layer, the sub-grouting pipes are arranged at intervals of 180° from each other; when three sub-grouting pipes are arranged on the same layer, the sub-grouting pipes are arranged at intervals of 60° from each other.

[0036] Among them, when the secondary grouting pipe 20 is provided with at least two layers of sub-grouting pipes, they are arranged in order from the bottom layer to the top layer as the first layer, the second layer ... the Nth layer, wherein N≥3, and the sub-grouting pipes of the second layer and the Nth layer are arranged outside the steel pipe pile A and fixed on the steel pipe pile A by welding. Since the sub-grouting pipes in the primary grouting pipe 10 and the sub-grouting pipes in the first layer of the secondary grouting pipe 20 are arranged at a position 1-3m below the bottom elevation of the tip of the conductor frame B from the inside of the steel pipe pile A to the annular space 30 outside the steel pipe pile A, it is to prevent the sub-grouting pipes reserved in the steel pipe pile A from hindering the installation of the conductor frame B, and the obstruction is eliminated in the upper area, then, the sub-grouting pipes of the second layer and above of the secondary grouting pipe 20 can be arranged in the annular space 30 outside the steel pipe pile A, that is, the bottom pipe mouth of the sub-grouting pipe is arranged in the annular space 30 outside the steel pipe pile A. In this embodiment, the arrangement of each layer of grouting pipes is described by taking the arrangement of two layers of sub-grouting pipes in the secondary grouting pipe 20 as an example. When the secondary grouting pipe 20 is provided with two layers of sub-grouting pipes, the first layer and the second layer are arranged from the bottom layer to the top layer, wherein the second layer is preferably arranged at a position between the bottom pipe opening elevation of the secondary grouting pipe 20 and the mud surface elevation.

[0037] The top pipe openings of the primary grouting pipe 10 and the secondary grouting pipe 20 are both flush with the top elevation of the steel pipe pile A.

[0038] Furthermore, the bottom pipe opening of the primary grouting pipe 10 / the secondary grouting pipe 20 arranged in the steel pipe pile A passes through the wall surface of the steel pipe pile A and is connected to the annular space 30 .

[0039] In this embodiment, the elevation of the bottom pipe opening of the primary grouting pipe 10 is set 0.5-1m higher than the top elevation of the bottom grouting opening. Preferably, the elevation of the bottom pipe opening of the primary grouting pipe 10 is set 0.5m higher than the top elevation of the bottom grouting opening.

[0040] In this embodiment, the bottom pipe opening of the secondary grouting pipe 20 is arranged 0.5-1m above the top elevation of the primary grouting pipe 10 . Preferably, the bottom pipe opening of the secondary grouting pipe 20 is arranged 0.5m above the top elevation of the primary grouting pipe 10 .

[0041] like Figure 3 As shown, in this embodiment, the primary grouting pipe 10 is preferably arranged as one layer, wherein the layer is provided with a sub-grouting pipe 01 and a sub-grouting pipe 04; the secondary grouting pipe 20 is preferably arranged as two layers, wherein the first layer is provided with a sub-grouting pipe 02 and a sub-grouting pipe 05, and the second layer is provided with a sub-grouting pipe 03 and a sub-grouting pipe 06. Among them, the sub-grouting pipe 01, the sub-grouting pipe 04, the sub-grouting pipe 02 and the sub-grouting pipe 05 are all led from the steel pipe pile A to the outside of the steel pipe pile A at a certain height at the bottom elevation of the tip of the jacket B. Among them, the annular space 30 is provided with multiple layers of grouting pipes, and each layer of grouting pipes is provided with multiple sub-grouting pipes. The bottom elevation of the grouting pipes in the same layer is spaced at a certain height, and the pipe openings of all sub-grouting pipes are flush with the top elevation of the steel pipe pile A. Among them, the number of layers of the primary grouting pipe 10 and the secondary grouting pipe 20 and the number of sub-grouting pipes set in each layer are only for distance description. Technical personnel in this field can appropriately increase or decrease the above-mentioned number according to actual needs, which does not limit the protection scope of this application.

[0042] In this embodiment, by providing a primary grouting pipe 10 and a secondary grouting pipe 20, emergency blockage problems during the grouting process can be effectively prevented. Specifically, when one of the sub-grouting pipes of the primary grouting pipe 10 and the secondary grouting pipe 20 is blocked during the grouting process, other sub-grouting pipes are replaced to continue grouting into the annular space 30; further, when a sub-grouting pipe of one layer of the primary grouting pipe 10 is blocked during the grouting process, other sub-grouting pipes in the sub-grouting pipe layer can be replaced to continue grouting into the annular space 30; similarly, when a sub-grouting pipe of one layer of the secondary grouting pipe 20 is blocked during the grouting process, other sub-grouting pipes in the sub-grouting pipe layer can be replaced to continue grouting into the annular space 30.

[0043] During the grouting process, the present embodiment first performs a primary grouting through the primary grouting pipe 10, and then performs a secondary grouting through the secondary grouting pipe 20, wherein the secondary grouting is performed after the grouting material of the primary grouting is completely solidified. The present embodiment only lists the case where the primary grouting pipe 10 and the secondary grouting pipe 20 are set. Of course, in the actual application process, a tertiary grouting pipe, a quadruple grouting pipe, or even M grouting pipes can be set as needed, wherein M≥5. The latter grouting should be performed after the grouting material of the previous grouting is completely solidified, such as the complete solidification time is 1 day.

[0044] Specifically, in this embodiment, after the bottom concrete grouting is completed and reaches the design strength requirement, the annular space 30 between the steel pipe pile A and the borehole wall is grouted through the primary grouting pipe 10. After the primary grouting strength reaches the design requirement, the annular space 30 is grouted through the secondary grouting pipe 20.

[0045] Furthermore, the primary grouting pipe 10 and the secondary grouting pipe 20 first pump water, then pump the pipe lubricating material, and finally pump the grouting material. The water is first pumped to remove impurities such as sludge in the primary grouting pipe 10 and the secondary grouting pipe 20, and then the pipe lubricating material is pumped to play a role in lubricating the pipe to prevent pipe blockage during the process of pumping the grouting material.

[0046] The design and installation of the prefabricated grouting pipes in the present application are all carried out before the shipment of the conductor frame, which is convenient for construction, reduces construction costs, and improves grouting safety; the present application proposes a primary grouting and a secondary grouting method for the grouting construction problem of the rock-embedded section of the conductor frame implanted rock-embedded piles by the pile-first method, and at the same time proposes a multi-layer arrangement of prefabricated grouting pipes for the primary grouting and the secondary grouting, and the height difference interval of the grouting pipes in the same layer is 0.5-1m. This grouting pipe design greatly reduces the risk of emergency treatment during the grouting process; the present application aims at a special arrangement method of the grouting pipes in the grouting area of ​​the conductor frame inserted into the steel pipe pile, which leads from the inside of the steel pipe pile to the outside of the steel pipe pile, thereby avoiding the problem of the reserved grouting pipes of the steel pipe pile hindering the installation of the conductor frame; the present application is suitable for the grouting construction of the rock-embedded section of the conductor frame implanted rock-embedded piles by the pile-first method, has strong versatility, can effectively reduce the risk of underwater grouting, improve construction efficiency, and ensure project quality. The present application can be promoted and applied in the grouting construction of the rock-embedded section of the embedded rock piles of the jacket by the pile-first method, has promotion and application value, and is of great significance for the jacket foundation construction at sites with thin covering soil layers in Guangdong and Fujian regions of my country.

[0047] The above embodiments are only used to illustrate the technical solution of the present application but not to limit it. The present application is described in detail with reference to the preferred embodiments. It should be understood by those skilled in the art that the technical solution of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application, and should be included in the scope of the claims of the present application.

Claims

1. A pile-first method jacket implanted rock-embedded pile rock-embedded section grouting pipe system, characterized in that: The grouting pipe system delivers grouting material to the annular space between the steel pipe pile and the borehole wall. The grouting pipe system comprises: a primary grouting pipe and a secondary grouting pipe, wherein the elevation of the bottom pipe opening of the primary grouting pipe is higher than the top elevation of the bottom sealing grouting opening, and the bottom pipe opening of the secondary grouting pipe is arranged above the top elevation of the primary grouting pipe; Part of the grouting pipes of the primary grouting pipe and the secondary grouting pipe, whose pipe opening bottom elevation is lower than the jacket tip bottom elevation, are arranged in an annular space from the inside of the steel pipe pile to the outside of the steel pipe pile at a position 1-3m below the jacket tip bottom elevation; The primary grouting pipe / the secondary grouting pipe are both provided with at least one layer of sub-grouting pipes, wherein the pipe openings of the multiple sub-grouting pipes arranged on the same layer are arranged at an interval of 0.5-1m in elevation; When the secondary grouting pipe is provided with at least two layers of sub-grouting pipes, from the bottom layer to the top layer, they are the first layer, the second layer, ... the Nth layer, wherein N≥3, and the sub-grouting pipes of the second layer and the Nth layer are both provided outside the steel pipe pile and fixed on the steel pipe pile by welding; When the secondary grouting pipe is provided with two layers of sub-grouting pipes, the first layer and the second layer are arranged from the bottom layer to the top layer, wherein the second layer is arranged at a position between the bottom pipe opening elevation and the mud surface elevation of the secondary grouting pipe; The bottom pipe opening of the primary grouting pipe / the secondary grouting pipe arranged in the steel pipe pile passes through the wall surface of the steel pipe pile and is connected with the annular space; The elevation of the bottom pipe opening of the primary grouting pipe is 0.5-1m higher than the top elevation of the bottom grouting opening; the bottom pipe opening of the secondary grouting pipe is set 0.5-1m above the top elevation of the primary grouting pipe.

2. The grouting pipe system according to claim 1, characterized in that: The top pipe openings of the primary grouting pipe and the secondary grouting pipe are both flush with the top elevation of the steel pipe pile.

3. The grouting pipe system according to claim 1, characterized in that: When one of the sub-grouting pipes of the primary grouting pipe and the secondary grouting pipe is blocked during the grouting process, the other sub-grouting pipe is replaced to continue grouting into the annular space.

4. The grouting pipe system according to claim 1, 2 or 3, characterized in that: First, primary grouting is performed through the primary grouting pipe, and then secondary grouting is performed through the secondary grouting pipe, wherein the secondary grouting is performed after the grouting material of the primary grouting is completely solidified.

5. The grouting pipe system according to claim 1, 2 or 3, characterized in that: The primary grouting pipe and the secondary grouting pipe first pump water, then pump the pipe lubricating material, and finally pump the grouting material.

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