Seabed vertical jacking riser piece structure and construction method

Abstract

The invention discloses a seabed vertical jacking riser sheet structure and a construction method, the seabed vertical jacking riser sheet structure comprises a plurality of segment units, the plurality of segment units are spliced along the extension direction of a seabed tunnel to form a plurality of sections of ring pipes, and the plurality of segment units of each section of ring pipe are respectively a pipe jacking cover, an adjacent block, a top sealing block and a plurality of composite segments; the pipe jacking cover is located at the top of the annular pipe unit, the adjacent block and the top sealing block are spliced to the two sides of the pipe jacking cover respectively, the multiple composite pipe pieces are spliced between the adjacent block and the top sealing block, and the splicing face between the pipe jacking cover and the top sealing block and the splicing face between the pipe jacking cover and the adjacent block are vertically arranged. The position where the pipe jacking cover is located serves as a pipe jacking hole for vertical jacking construction. The device has the effect that the top structure of the subsea tunnel can be conveniently ejected out.

Description

Technical Field

[0001] The present application relates to the field of submarine water intake tunnels, and in particular to a submarine vertical jacking riser segment structure and a construction method. Background Art

[0002] Submarine water intake tunnels are one of the important infrastructures in special geographical areas such as coastal areas and islands. Traditional water intake methods such as ground drilling and pumping stations have high construction and maintenance costs and are difficult to meet the water resource needs of these areas. With the advancement of science and technology, submarine shield water intake tunnels have gradually gained attention as a new water intake method. This technology can not only improve water intake efficiency, but also reduce the impact on the environment, and has high safety and environmental protection. Especially in large-scale municipal projects and water supply and drainage projects, submarine shield water intake tunnels are increasingly widely used and have become an effective way to solve water resource problems in coastal areas.

[0003] In the construction process of submarine water intake tunnels, commonly used construction methods include island cofferdam method, floating caisson method and offshore drilling method. Among them, the island cofferdam method builds a temporary cofferdam on the seabed, removes the internal water and then excavates the tunnel; the floating caisson method prefabricates the caisson on the shore, then floats it to the designated location and sinks it into place; the offshore drilling method uses drilling equipment to directly drill holes in the seabed to extract water. In addition, the vertical jacking technology that has emerged in recent years has also been widely used. This technology uses hydraulic devices to gradually jack up the pre-assembled segment structure to the designed height, thereby realizing the connection between the inside and outside of the tunnel. Although these conventional methods have their own characteristics, there are still some shortcomings in practical applications.

[0004] Although the existing various construction methods can meet the construction needs of submarine water intake tunnels to a certain extent, they still face many challenges in the specific implementation process. Especially when crossing the beach area with rich water, shallow burial and complex geological conditions, the traditional method often requires a large lifting force to push out the soil of the pipe segment at the top of the submarine tunnel, and the adjacent pipe segment structures in the tunnel are usually assembled in a staggered manner, which makes it difficult for the pipe segment located in the vertical lifting section to be smoothly pushed out by the lifting mechanism, seriously affecting the construction progress and efficiency. Therefore, how to optimize the design of the pipe segment structure to improve this problem has become a key technical problem that needs to be solved urgently. Summary of the invention

[0005] In order to facilitate the top of a submarine tunnel segment structure to be pushed out, the present application provides a submarine vertical jacking riser segment structure and a construction method.

[0006] The present application provides a subsea vertical jacking riser segment structure and construction method using the following technical solutions: A subsea vertical jacking riser segment structure comprises a plurality of segment units, wherein the plurality of segment units are through-jointedly spliced ​​along the extension direction of the subsea tunnel to form a plurality of annular tube sections, wherein the plurality of segment units of each annular tube section are respectively a jacking cover, an adjacent block, a capping block and a plurality of composite segments, wherein the jacking cover is located at the top of the annular tube unit, the adjacent blocks and the capping blocks are respectively spliced ​​at both sides of the jacking cover, and the plurality of composite segments are spliced ​​between the adjacent blocks and the capping blocks, and the splicing surfaces between the jacking cover and the capping blocks and between the jacking cover and the adjacent blocks are both arranged vertically, and the position where the jacking cover is located serves as a jacking hole for vertical jacking construction.

[0007] By adopting the above technical scheme, the through-seam assembly method of the segment units can significantly improve the stability of the jacking cover during the vertical jacking process, and avoid the problem of adjacent segment units affecting the normal jacking of the vertical jacking equipment in the staggered assembly method, so that the jacking cover can be smoothly ejected. At the same time, the splicing surfaces between the jacking cover and the capping block and the splicing surfaces between the jacking cover and the adjacent blocks are both vertically arranged, which not only makes the splicing tighter, but also the jacking direction of the vertical jacking construction is consistent with the direction of the splicing surface, which further reduces the resistance encountered during the jacking process and improves the construction efficiency.

[0008] Preferably, the bottom of the top tube cover is rectangular and arranged horizontally.

[0009] By adopting the above technical solution, the bottom of the jacking cover is rectangular and horizontally arranged, which can ensure that during the vertical jacking process, the contact surface between the jacking cover and the jacking equipment is smoother and more stable, reducing the uneven force problem caused by irregular shape, improving the safety and stability of the jacking process, and facilitating the operation and positioning of construction personnel, thereby improving construction efficiency.

[0010] Preferably, a water-stop structure is provided at the joint surface between the top pipe cover and the capping block and at the joint surface between the top pipe cover and the adjacent block.

[0011] By adopting the above technical solution, water-stopping structures are provided at the joint surface between the top pipe cover and the capping block, and at the joint surface between the top pipe cover and the adjacent block, which effectively prevents groundwater from infiltrating into the tunnel, enhances the waterproof performance of the pipe segment structure, and improves the construction quality. At the same time, the setting of the water-stopping structure can also reduce the safety hazards caused by leakage and extend the service life of the submarine tunnel.

[0012] Preferably, a grouting hole is provided on the outer side of the top pipe cover.

[0013] By adopting the above technical solution, grouting holes are opened on the outer side of the jacking cover. The design of the grouting holes allows the gap between the pipe segment and the surrounding soil to be filled by pressing in cement slurry or other filling materials during the construction process, thereby improving the airtightness and waterproof performance of the overall structure. By injecting filling materials into the grouting holes, the contact area between the pipe segment and the surrounding rock and soil can be increased, thereby improving the overall stability of the pipe segment structure and reducing the risk of structural deformation or displacement caused by changes in the external environment. During the vertical jacking construction stage, the grouting holes help to quickly fix the position of the jacking cover, ensure stability and safety during the jacking process, and further accelerate the construction progress.

[0014] A construction method for a submarine vertical jacking riser segment structure comprises the following steps: S1: Shield tunneling, forming tunnel holes, and transporting segment units to the segment installation area; S2: Assemble the segment structure. The segment units of the normal section of the lining ring in the non-vertical jacking construction area are assembled with staggered seams, and several segment units in the vertical jacking construction area are assembled with through seams. The assembly order of each ring pipe in the vertical jacking construction area is the jacking cover, adjacent blocks, and several composite segments and capping blocks. The capping blocks are assembled by longitudinal insertion to connect and lock adjacent segment units.

[0015] By adopting the above technical scheme, the segment units of the normal section of the lining ring in the non-vertical jacking construction area are assembled with staggered seams, which effectively improves the overall stability of the entire tunnel structure; and several segment units in the vertical jacking construction area are assembled with through seams, which simplifies the construction process and reduces the assembly time, especially in the early stage of vertical jacking construction, it can quickly form the jacking hole, reduce the initial jacking force required for jacking, ensure that the capping block can be smoothly ejected, and improve the construction efficiency; the reasonable layout and assembly sequence between the jacking cover, adjacent blocks, capping blocks and composite segments further ensure the reliability and sealing of the segment structure and avoid the risk of leakage. The design of the bottom of the jacking cover is rectangular and horizontally set, so that the jacking cover is more evenly distributed when it is subjected to the jacking force, which enhances the safety of the structure; the vertical joint surface design between the jacking cover and the capping block and adjacent blocks facilitates construction operations and improves installation accuracy. The grouting holes opened on the outside of the top pipe cover are helpful for the subsequent grouting reinforcement and improve the stability of the overall structure. In addition, the top block is the last segment unit to be assembled, and its longitudinal insertion method can ensure accurate docking and tight connection during the assembly process. This design not only improves the construction efficiency, but also enhances the stability of the overall structure, and effectively prevents the position deviation and poor sealing problems that may be caused by horizontal assembly. At the same time, the longitudinal insertion method reduces the impact on the surrounding installed segments, reduces the construction risk, and further improves the safety and reliability of the entire submarine vertical jacking riser segment structure.

[0016] Preferably, in S1, a water-stop rubber is used as the water-stop structure, and before the segment units are assembled, the water-stop rubber is assembled in advance to the joint surfaces on both sides of the top pipe cover.

[0017] By adopting the above technical solution, the waterproof performance of the pipe segment structure can be effectively improved. Specifically, the waterproof rubber is pre-installed on the joint surfaces on both sides of the top pipe cover to ensure the sealing between the pipe segment units during the assembly process, prevent seawater from seeping into the tunnel, and improve the safety and reliability of construction. At the same time, pre-installing the waterproof rubber can also reduce the time and difficulty of on-site operations, further improving construction efficiency.

[0018] Preferably, in S2, after the segment unit is installed in place, a cylinder is used to tighten the segment at a corresponding position of the segment, and the thrust of the cylinder is greater than the force required to stabilize the segment.

[0019] By adopting the above technical solution, the stability of the pipe segments during the installation process is improved, displacement or deflection caused by external environmental factors is prevented, and the construction accuracy and safety are improved; at the same time, the thrust force provided by the cylinder is greater than the force required to stabilize the pipe segments, which can effectively offset the external pressure, ensure close contact between the pipe segments, and enhance the rigidity and sealing performance of the overall structure.

[0020] Preferably, in S2, after the segment units are installed in place, bolts are installed in time to achieve tightening, and after the annular pipe is detached from the shield tail of the shield machine after the installation is completed, the bolts of the adjacent segment units are tightened for a second time.

[0021] By adopting the above technical solution, the stability of the segment unit during installation is improved, the displacement or falling of the segment due to improper installation is effectively prevented, and the safety and reliability of construction are improved. At the same time, by tightening the bolts of adjacent segment units twice, the overall structural strength of the ring pipe is further enhanced, the sealing performance is improved, the risk of leakage is reduced, and the service life of the project is extended.

[0022] In summary, the present application includes at least one of the following beneficial technical effects: 1. The vertical joint surface design between the jacking cover, the capping block and the adjacent blocks effectively reduces the resistance during the vertical jacking process and improves the construction efficiency; 2. The application of the through-seam assembly method of the segment units in the vertical jacking section ensures the close connection between the segments during the jacking process, avoids the jamming phenomenon caused by staggered assembly, and improves the stability of the overall structure; 3. Water-stopping structures are set at the joint surfaces on both sides of the top pipe cover to enhance the waterproof performance of the segment structure and ensure the safety and reliability of the construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1It is a schematic diagram of the assembly of a submarine vertical jacking riser segment structure according to an embodiment of the present application.

[0024] Figure 2 yes Figure 1 A flattened interior view of a plane.

[0025] Explanation of reference numerals: GD, top pipe cover; GL, adjacent block; GF, capping block; BF, composite segment. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1-2 This application is described in further detail.

[0027] The present application embodiment discloses a subsea vertical jacking riser segment structure, referring to Figure 1 and Figure 2 , including several segment units, which are spliced ​​through seams along the extension direction of the seabed tunnel to form several sections of ring pipes. The several segment units of each section of the ring pipe are respectively the top pipe cover GD, the adjacent block GL, the capping block GF and several composite segments BF. The top pipe cover GD is located at the top of the ring pipe unit, the adjacent block GL and the capping block GF are spliced ​​on both sides of the top pipe cover GD, and several composite segments BF are spliced ​​between the adjacent block GL and the capping block GF. The splicing surface between the top pipe cover GD and the capping block GF and the splicing surface between the top pipe cover GD and the adjacent block GL are both vertically arranged, and the position of the top pipe cover GD is used as the top pipe hole for vertical jacking construction.

[0028] exist Figure 2 In the figure, the annular pipes where the top pipe caps GD1 and GD2 are located are open rings, i.e., the future top pipe holes, and the annular pipes where the top pipe caps GD3, GD4, and GD5 are located are closed rings, and there are no top pipe holes for vertical jacking construction at this position. In addition, the composite pipe segment BF1 is a standard composite pipe segment, and the composite pipe segment BF2 is a wedge-shaped composite pipe segment. The wedge shape of the composite pipe segment BF2 is used to cooperate with the wedge-shaped part of the capping block BF1 or the capping block BF2 to improve the splicing and sealing of the annular pipe.

[0029] In this embodiment, the top of the top pipe cover GD is arc-shaped, and the bottom is rectangular and horizontally arranged. Grouting holes are opened on the outside of the top pipe cover GD for injecting cement slurry during construction to enhance the stability of the structure. The material of the top pipe cover GD can be selected from high-strength steel or prestressed concrete to improve its bearing capacity and corrosion resistance.

[0030] In this embodiment, the adjacent block GL includes a semicircular protrusion structure with a smooth surface and chamfered edges. A water-stop structure is provided at the joint surface between the adjacent block GL and the top pipe cover GD. The water-stop structure uses a water-stop rubber, or a rubber sealing ring or an expansion strip to ensure water tightness. The material of the adjacent block GL can be cast iron, which has good rigidity and impact resistance.

[0031] In this embodiment, a water stop structure is also provided at the joint surface between the capping block GF and the top pipe cover GD, and the water stop structure adopts a water stop rubber to prevent leakage. The material of the capping block GF is also selected from high-strength steel or prestressed concrete to ensure sufficient strength and durability.

[0032] In this embodiment, the composite segment BF is connected to the adjacent block GL and the capping block GF by bolting to ensure that the components are tightly combined. The composite segment BF can be made of reinforced concrete or glass fiber reinforced plastic, which has the characteristics of light weight and high strength.

[0033] The joint surface between the jacking cover GD and the capping block GF and the joint surface between the jacking cover GD and the adjacent block GL are both arranged vertically, making the pipe segment structure more compact and reducing the construction difficulty. This design helps to improve the lifting force transmission efficiency and reduce the energy consumption required during the lifting process.

[0034] The outer side of the top pipe cover GD is provided with grouting holes, which can be used to timely inject cement slurry during the construction process to fill the gaps between the pipe segments and enhance the overall stability of the structure. At the same time, the grouting holes can also be used to monitor the pressure inside the pipeline to ensure construction safety.

[0035] In order to further improve the reliability and service life of the structure, this embodiment provides reinforcing ribs at the joint surface between the top pipe cover GD and the capping block GF, and adds built-in sensors in the composite pipe segment BF to monitor the status of the pipe segment in real time. The reinforcing ribs include metal rods arranged crosswise in the transverse and longitudinal directions, embedded in the contact surface of the top pipe cover GD and the capping block GF. The metal rods can be made of galvanized steel or carbon fiber composite materials to improve tensile strength and durability. The setting of the reinforcing ribs effectively disperses the lifting force to avoid damage caused by excessive local force. Built-in sensors are added to the composite pipe segment BF to detect parameters such as temperature, humidity, and pressure. The sensor can be a wireless transmission type or a wired connection type, and the data can be transmitted to the control center via a cable. The use of built-in sensors can not only monitor the status of the pipe segment in real time, but also warn of potential risks in advance to ensure construction safety.

[0036] In order to adapt to the construction requirements under different geological conditions, this embodiment adopts an adjustable water-stopping structure on the joint surface of the top pipe cover GD and the capping block GF, and adds an elastic buffer layer to the composite pipe segment BF. The adjustable water-stopping structure includes multiple sets of retractable rubber sealing belts, and the tension of the sealing belts can be adjusted according to actual needs. The rubber sealing belt can be made of natural rubber or synthetic rubber material to improve wear resistance and aging resistance. The flexibility of the adjustable water-stopping structure enables it to better adapt to various complex construction environments and ensure good watertightness. The elastic buffer layer includes one or more layers of foam material, which is clamped on the inner side of the composite pipe segment BF. The foam material can be made of polyurethane foam or EVA material, which has good shock absorption and vibration reduction properties. The addition of the elastic buffer layer can not only absorb external impact force, but also reduce friction between pipe segments and extend service life.

[0037] In order to further optimize the distribution of the lifting force, the present embodiment sets evenly distributed support points at the bottom of the top pipe cover GD, and installs a guide device on the top of the capping block GF. The support points include a plurality of small cylinders evenly distributed at the bottom of the top pipe cover GD, and the height and diameter of each small cylinder are adjustable. The small cylinders can be made of cemented carbide or ceramic materials to improve hardness and wear resistance. The setting of the support points helps to evenly distribute the lifting force and reduce local stress concentration. The guide device includes a set of fixed guide rails and a movable slider, which is installed on the top of the capping block GF. The guide rails can be made of stainless steel, and the sliders are made of copper alloy. The two have a close fit to ensure smooth sliding. The use of the guide device not only simplifies the construction operation, but also improves the lifting accuracy and stability.

[0038] The implementation principle of this embodiment is: By optimizing the design of the segment structure, especially by rationally matching the jacking cover GD, adjacent block GL, capping block GF and composite segment BF, an efficient and stable vertical jacking system is formed. The vertically arranged splicing surface not only improves the transmission efficiency of the jacking force, but also reduces the friction resistance during the construction process, significantly improving the construction speed and safety. In addition, the water-stop structure and grouting holes effectively enhance the water tightness and stability of the structure, solve many problems existing in traditional methods, and greatly reduce engineering costs and maintenance costs. The reliability and intelligent monitoring capabilities of the segment structure are further enhanced by introducing reinforcement ribs and built-in sensors. The setting of reinforcement ribs effectively disperses the jacking force and extends the service life of the structure.

[0039] The present application also discloses a construction method for a subsea vertical jacking riser segment structure, comprising the following steps: S1: Prepare the shield machine, which has basic functions such as excavation system, mucking system, mucking improvement system, pressure pump mucking system, segment installation system, grouting system, power system, control system, and measurement and guidance system. Check whether the various equipment of the shield machine are operating normally, and ensure that the hydraulic system, propulsion system, grouting system, etc. are working well. After the shield machine is assembled, it moves forward along the predetermined trajectory, cuts the soil, and discharges the slag. During the excavation process, inject mud or bentonite in time to maintain the stability of the face. Use special transport vehicles to transport the segment units to the construction site and place them in the designated stacking area. Among them, before assembling the segment units, assemble the water-stop rubber to the joint surfaces on both sides of the top pipe cover GD in advance to ensure water tightness.

[0040] S2: Segment structure assembly: In non-vertical jacking construction areas, staggered assembly is used to assemble the lining ring. First install the standard segment at the bottom of the tunnel, and then install the wedge segment at the top of the tunnel to ensure that the assembled ring pipe is flat and correct. After each assembly is completed, use a jack or cylinder to tighten the newly assembled segment. The cylinder's top thrust is greater than the force required to stabilize the segment to ensure that the connection between the segments is firm.

[0041] When assembling the segment units in the vertical jacking section, first position the top pipe cover GD on the top of the ring pipe to ensure that the top pipe cover GD is in the correct position. Then assemble the adjacent block GL, composite segment BF and capping block GF in sequence. The capping block GF is assembled by longitudinal insertion. Before installing the capping block GF, the water stop strip should be lubricated.

[0042] The joint surfaces between the top pipe cover GD and the adjacent block GL and the capping block GF are all set vertically to ensure accurate assembly. Use a cylinder to tighten each segment unit to ensure that the connection between the segments is tight and not affected by the vibration generated during the construction process. After all the segment units are installed, tighten the bolts immediately to ensure that the connection between the segment units is firm. When the ring pipe is separated from the shield tail of the shield machine, the bolts of the adjacent segment units are tightened again to ensure long-term stability.

[0043] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A subsea vertical jacking riser segment structure, characterized in that: The invention comprises a plurality of segment units, which are connected through seams along the extension direction of the underwater tunnel to form a plurality of ring pipe sections. The segment units of each ring pipe section are a top pipe cover (GD), an adjacent block (GL), a capping block (GF) and a plurality of composite segments (BF). The top pipe cover (GD) is located at the top of the ring pipe unit, the adjacent block (GL) and the capping block (GF) are respectively connected to the two sides of the top pipe cover (GD), and a plurality of composite segments (BF) are connected between the adjacent block (GL) and the capping block (GF). The joint surface between the top pipe cover (GD) and the capping block (GF) and the joint surface between the top pipe cover (GD) and the adjacent block (GL) are both arranged vertically. The position where the top pipe cover (GD) is located serves as a top pipe hole for vertical jacking construction.

2. A subsea vertical jacking riser segment structure according to claim 1, characterized in that: The bottom of the top pipe cover (GD) is rectangular and arranged horizontally.

3. The subsea vertical jacking riser segment structure according to claim 1, characterized in that: Water-stopping structures are provided at the joint surface between the top pipe cover (GD) and the capping block (GF) and at the joint surface between the top pipe cover (GD) and the adjacent block (GL).

4. A subsea vertical jacking riser segment structure according to claim 1, characterized in that: The outer side of the top pipe cover (GD) is provided with a grouting hole.

5. A construction method for a submarine vertical jacking riser segment structure according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1: Shield tunneling, forming tunnel holes, and transporting segment units to the segment installation area; S2: Assemble the segment structure. The segment units of the normal section of the lining ring in the non-vertical jacking construction area are assembled with staggered seams, and several segment units in the vertical jacking construction area are assembled with through seams. The assembly order of each ring pipe in the vertical jacking construction area is the jacking cover (GD), adjacent block (GL), and several composite segments (BF) and capping block (GF). The capping block (GF) is assembled by longitudinal insertion to connect and lock adjacent segment units.

6. A construction method for a submarine vertical jacking riser segment structure according to claim 5, characterized in that: In S1, a water-stop rubber is used as a water-stop structure. Before the segment units are assembled, the water-stop rubber is assembled to the joint surfaces on both sides of the top pipe cover (GD) in advance.

7. The construction method of a submarine vertical jacking riser segment structure according to claim 5, characterized in that: In S2, after the segment unit is installed in place, the segment is tightened by a cylinder at the corresponding position of the segment, and the thrust of the cylinder is greater than the force required to stabilize the segment.

8. The method for constructing a subsea vertical jacking riser segment structure according to claim 5, characterized in that: In S2, after the segment units are installed in place, bolts are installed in time to achieve tightening, and after the ring pipe is separated from the shield tail of the shield machine after installation, the bolts of the adjacent segment units are tightened for a second time.

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