A sunken pipe for reducing the weight of reinforced concrete

Abstract

The present invention relates to a sunken tube for reducing the weight of reinforced concrete, including a main body. A weight reduction component is provided in the reinforced concrete of the main body. The weight reduction component has a cavity, and the cavity can be used for pouring concrete. By arranging the weight reduction component in the main body of the sunken tube, the weight reduction of the sunken tube is achieved through the cavity, so that the draft required for floating the sunken tube is shallower, the floating of the sunken tube is made easier, and the safety of floating the sunken tube is improved; moreover, the excavation and deepening of the river under the floating route of the sunken tube can be reduced, and the project investment can be saved. In addition, concrete can be poured into the cavity after the floating of the sunken tube is completed or when the sunken tube is floated to the middle position, which can ensure the quality and safety of the sunken tube during use.

Description

Technical Field

[0001] The present invention relates to the technical field of immersed tubes, and particularly to an immersed tube for reducing the weight of reinforced concrete. Background Art

[0002] Currently, immersed tubes at home and abroad can be roughly divided into three categories from the structural type: early steel shell immersed tubes (single-layer / double-layer), commonly used immersed tubes for reducing the weight of reinforced concrete, and less used steel shell concrete immersed tubes. At present, for immersed tube tunnels in the core areas of cities, it is often necessary to excavate long-distance floating channels in urban inland rivers, and the amount of dredging and rock drilling is huge. This will lead to a significant extension of the overall project of the immersed tube tunnel, and in the face of the increase in the floating line of the immersed tube, the floating period of the immersed tube is long, requiring more floating time. Moreover, the water depth of urban inland rivers is relatively shallow, making it difficult to meet the floating requirements. Currently, the immersed tube is usually floated at high tide, but the high tide floating window period is short, making it impossible to meet the floating water depth for a long time; and urban inland rivers may involve important structures such as bridges and subways, making it impossible to significantly deepen the excavation of urban inland rivers, thereby making the floating of the immersed tube difficult and the floating safety factor relatively low. Summary of the Invention

[0003] The purpose of the present invention is to provide an immersed tube for reducing the weight of reinforced concrete in view of the problems of difficult floating of the immersed tube and relatively low floating safety factor when the floating water depth of the immersed tube cannot be satisfied in the prior art.

[0004] In order to achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] An immersed tube for reducing the weight of reinforced concrete, including a main body. A weight reduction component is provided in the reinforced concrete of the main body. The weight reduction component has a cavity, and the cavity can be used for pouring concrete.

[0006] By using the immersed tube for reducing the weight of reinforced concrete described in this solution, a weight reduction component is provided in the main body of the immersed tube. The weight reduction component realizes the weight reduction of the immersed tube through the cavity, making the draft required for the immersed tube during floating shallower, making the floating of the immersed tube easier and improving the floating safety of the immersed tube; and it can reduce the excavation and deepening of the river under the floating line of the immersed tube, and can save project investment. Moreover, concrete can be poured into the cavity after the floating of the immersed tube is completed or the immersed tube is floated to the middle position, which can ensure the quality and safety of the immersed tube during use.

[0007] Preferably, the weight reduction component includes a pre-embedded component with pre-embedded steel pipes, and the pre-embedded steel pipes have communication ports communicating with the outside.

[0008] The embedded components formed by embedded steel pipes are embedded inside the reinforced concrete of the immersed tube, which is convenient for the embedding operation. And after floating transportation, concrete is poured into the embedded steel pipes through the communication ports. The steel pipe concrete structure formed after the combination of the concrete and the steel pipes can be perfectly integrated into the reinforced concrete of the immersed tube, so that the quality of the immersed tube during use can meet the pre-designed requirements and meet the normal use conditions of the immersed tube.

[0009] Preferably, the communication ports are located above the top plate. During floating transportation, the communication ports are always above the water surface, which can prevent water from entering the embedded steel pipes. And it is more convenient for pouring concrete later, and can ensure the forming quality of the concrete poured into the embedded steel pipes.

[0010] Preferably, the embedded component includes an upper embedded steel pipe member, and the upper embedded steel pipe member is arranged in the top plate of the main body. The upper embedded steel pipe member has a communication port;

[0011] and / or,

[0012] The embedded component includes a lower embedded steel pipe member, and the lower embedded steel pipe member is arranged in the side wall and the bottom plate of the main body. The lower embedded steel pipe member has a communication port.

[0013] For standard pipe sections, when the weight reduction degree of the immersed tube is low, due to more outfitting parts on the top plate, the buried pipes have an impact on the installation of the outfitting parts. While the construction difficulty of burying pipes in the bottom plate and the wall is low. Lifting the steel pipes for burying on the top plate is relatively cumbersome, and the increased weight of the steel pipes increases the load on the immersed tube formwork and raises potential risks. Therefore, from the perspective of installation difficulty, the priority of burying the lower embedded steel pipe members in the bottom plate and the wall is higher than that of burying the upper embedded steel pipe members in the top plate. When the weight reduction requirement is high, it is necessary to bury the lower embedded steel pipe members in the bottom plate and the wall while burying the upper embedded steel pipe members in the top plate.

[0014] For variable cross-section pipe sections, compared with standard pipe sections, variable cross-section pipe sections have the problem of attitude leveling. Calculating the leveling counterweight for burying steel pipes on the top plate is relatively easy. In addition, variable cross-section immersed tubes are relatively complex, and the construction difficulty of burying pipes in the bottom plate and the wall is greater. While burying pipes on the top plate, the center of gravity of the immersed tube is lower, and it is not easy to become unstable during the floating transportation of the immersed tube. During the floating transportation process, mainly the outer walls and the bottom plate of the immersed tube bear the water pressure. Burying pipes on the top plate is safer and helps to reduce construction safety and quality risks. Therefore, when the weight reduction degree of the immersed tube is low, the priority of burying the upper embedded steel pipe members in the top plate is higher than that of burying the lower embedded steel pipe members in the bottom plate and the wall. When the weight reduction requirement of the immersed tube is high, it is necessary to bury the lower embedded steel pipe members in the bottom plate and the wall while burying the upper embedded steel pipe members in the top plate.

[0015] Preferably, when the embedded component includes an upper embedded steel pipe member:

[0016] The upper embedded steel pipe component includes a first embedded pipe which is horizontally arranged along the top plate. Communication ports are provided at both ends and in the middle of the first embedded pipe.

[0017] and / or

[0018] The upper embedded steel pipe component includes a second embedded pipe and a third embedded pipe. The second embedded pipe and the third embedded pipe are located on the same cross-section of the main body. The second embedded pipe and the third embedded pipe are horizontally arranged along the top plate. There is a gap between the second embedded pipe and the third embedded pipe. Communication ports are respectively provided at both ends of the second embedded pipe and both ends of the third embedded pipe.

[0019] Communication ports are provided at both ends and in the middle of the first embedded pipe. The communication ports at both ends are used as grouting ports to pour concrete, and the communication port in the middle is used as an exhaust port to discharge the first embedded pipe, which can ensure the pouring quality of the concrete in the first embedded pipe.

[0020] There is a gap between the second embedded pipe and the third embedded pipe, which is used to skip the position where a measurement tower needs to be set on the immersed tube top plate, so that the strength of the position where the measurement tower is set on the immersed tube top plate meets the requirements. The two ends of the second embedded pipe and one end of the third embedded pipe close to the side wall of the immersed tube are grouting ports, and the end close to the middle of the immersed tube is an exhaust port. First, it can ensure that the position of pouring concrete is the same as that of the first embedded pipe, making the pouring more convenient; second, it can ensure the balance when pouring concrete, and it is safer when pouring concrete on the water.

[0021] Preferably, when the upper embedded steel pipe component includes a first embedded pipe, both ends of the first embedded pipe extend to the side walls on both sides of the main body, and the part of the first embedded pipe extending to the side wall is inclined downward.

[0022] When the upper embedded steel pipe component includes a second embedded pipe and a third embedded pipe, the second embedded pipe and the third embedded pipe extend to the corresponding side walls, and the parts of the second embedded pipe and the third embedded pipe extending to the side walls are inclined downward.

[0023] One end of the first embedded pipe, the second embedded pipe and the third embedded pipe close to the side wall can extend to the side wall, so that more weight can be reduced. And the part extending to the side wall is inclined downward, which can adapt to the angular inclination of the immersed tube; and it can strengthen the connection between the immersed tube top plate and the side wall, making the quality of the immersed tube better.

[0024] Preferably, when the embedded component includes a lower embedded steel pipe component:

[0025] The lower embedded steel pipe component includes a horizontally arranged fourth embedded pipe and at least three vertically arranged fifth embedded pipes. The fifth embedded pipes are connected to the fourth embedded pipe downward. The fourth embedded pipe is arranged on the bottom plate, the fifth embedded pipes are arranged on the side wall, and the fifth embedded pipes are arranged on at least one middle wall of the main body. The upper end of the fifth embedded pipe has a communication port.

[0026] By adopting the above-mentioned lower embedded steel pipe component, the connection between the bottom slab and the immersed tube wall is good, and the weight of the immersed tube can be significantly reduced by making full use of the wall and the bottom slab of the immersed tube. The communication port at the upper end of the fifth embedded pipe on the side wall serves as the pouring port, and the communication port at the upper end of the fifth embedded pipe in the middle wall serves as the exhaust port, which can ensure the balance of pouring and make the pouring safer.

[0027] Preferably, the end of the fourth embedded pipe is inclined upward to communicate with the lower end of the fifth embedded pipe located on the side wall, which can adapt to the inclination of the lower corner of the immersed tube, and facilitate the concrete poured from the communication port at the upper end of the fifth embedded pipe on the side wall to slowly flow to the middle of the fourth embedded pipe at the inclined part of the end of the fourth embedded pipe, avoiding the accumulation of concrete at the end of the fourth embedded pipe and causing difficulties in subsequent concrete pouring.

[0028] Preferably, when the embedded component includes a lower embedded steel pipe component and an upper embedded steel pipe component, the lower embedded steel pipe component and the upper embedded steel pipe component are longitudinally staggered along the body.

[0029] During the pouring of the immersed tube, the bottom slab and the wall are poured together, and the top slab is tied after the installation of the formwork for the bottom slab and the wall. The immersed tube first ties the steel bars of the bottom slab and the wall and incidentally buries the fourth and fifth embedded pipes inside, and then the large formwork cavity enters, so that it is possible to tie the steel bars of the top slab and embed the first, second, and third embedded pipes, etc. In order to set the upward communication port, it is necessary to longitudinally stagger the lower embedded steel pipe component and the upper embedded steel pipe component along the body. Moreover, the thickness of the top slab is limited, and there are also the positions of the protective layer and the steel bars. The staggered layout is beneficial to ensuring the structural strength of the top slab, having better mechanical properties, and contributing to quality control and safety control.

[0030] Preferably, protective piers are provided on the outer surface of the body. The protective piers have grooves, and at least part of the protective piers are arranged corresponding to the communication ports and the communication ports are located inside the grooves of the corresponding protective piers.

[0031] Adjust at least part of the protective piers according to the position of the communication port so that the communication port is located inside the groove of the corresponding protective pier, so that the protective pier not only serves as the anti-collision protection of the immersed tube, but also can protect the communication port and ensure the smooth pouring in the later stage.

[0032] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are:

[0033] 1. For the immersed tube that reduces the weight of reinforced concrete in the present invention, a weight reduction component is arranged inside the body of the immersed tube. The weight reduction component realizes the weight reduction of the immersed tube through a cavity, making the draft required for the floating transportation of the immersed tube shallower, making the floating transportation of the immersed tube easier and improving the safety of the floating transportation of the immersed tube; and it can reduce the excavation and deepening of the river under the floating transportation route of the immersed tube, and can save project investment. Moreover, concrete can be poured into the cavity after the floating transportation of the immersed tube is completed or the immersed tube is floated to the middle position, which can ensure the quality and safety of the immersed tube during use.

[0034] 2. For the immersed tube that reduces the weight of reinforced concrete in the present invention, a pre-embedded component formed by pre-embedded steel pipes is used as the weight reduction component and pre-embedded inside the reinforced concrete of the immersed tube, which is convenient for pre-embedding operation; and after floating transportation, concrete is poured into the pre-embedded steel pipes through the communication ports. The steel pipe concrete structure formed after the combination of the concrete and the steel pipes can perfectly integrate into the reinforced concrete of the immersed tube, making the quality of the immersed tube during use meet the requirements of the preliminary design and satisfying the normal use conditions of the immersed tube.

[0035] 3. For the immersed tube that reduces the weight of reinforced concrete in the present invention, at least part of the protection piers are adjusted according to the position of the communication ports, so that the communication ports are located inside the grooves of the corresponding protection piers, making the protection piers not only serve as the anti-collision protection of the immersed tube, but also can protect the communication ports and ensure that the pouring can be smoothly realized in the later stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a schematic structural diagram of the top plate of the immersed tube that reduces the weight of reinforced concrete in Embodiment 1 with pre-embedded steel pipes;

[0037] Figure 2 is Figure 1 the sectional view taken along line A-A in

[0038] Figure 3 is Figure 1 the sectional view taken along line B-B in

[0039] Figure 4 is Figure 1 the sectional view taken along line C-C in

[0040] Figure 5 is Figure 4 the partial enlarged view at A in

[0041] Figure 6 is Figure 4 the partial enlarged view at B in

[0042] Figure 7 is Figure 1 the sectional view taken along line D-D in

[0043] Figure 8 is Figure 1Schematic cross-sectional view at E-E;

[0044] Figure 9 is Figure 1 Schematic cross-sectional view at L-L;

[0045] Figure 10 is a schematic structural view of a pre-embedded steel pipe provided on the bottom plate of a sunken tube for reducing the weight of reinforced concrete in Embodiment 1;

[0046] Figure 11 is Figure 10 Schematic cross-sectional view at J-J;

[0047] Figure 12 is Figure 11 Schematic enlarged partial view at the circled part;

[0048] Figure 13 is Figure 10 Schematic cross-sectional view at K-K;

[0049] Figure 14 is Figure 10 Schematic cross-sectional view at M-M.

[0050] Icon: 1 - body; 11 - top plate; 12 - bottom plate; 13 - side wall; 14 - middle wall; 211 - measurement tower; 23 - jack pulling seat; 241 - double-column mooring bitt; 242 - single-column mooring bitt; 25 - pipe section lifting point; 27 - guide rod; 3 - pre-embedded steel pipe; 31 - first pre-embedded pipe; 32 - second pre-embedded pipe; 33 - third pre-embedded pipe; 34 - fourth pre-embedded pipe; 35 - fifth pre-embedded pipe; 41 - grouting hole; 42 - exhaust hole; 43 - through pipe; 5 - protection pier; 51 - groove. Detailed implementation manners

[0051] The present invention will be described in detail below with reference to the accompanying drawings.

[0052] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0053] Embodiment 1

[0054] This embodiment provides a sunken tube for reducing the weight of reinforced concrete. Refer to Figures 1 - 14 , which includes a body 1. The reinforced concrete of the body 1 has a weight-reducing component, and the weight-reducing component has a cavity that can be used for pouring concrete.

[0055] The immersed tube for reducing the weight of reinforced concrete described in this solution can be a standard pipe section or a variable cross-section pipe section. A weight reduction component is arranged inside the main body 1 of the immersed tube. The weight reduction component realizes the weight reduction of the immersed tube through a cavity, making the draft required for the floating transportation of the immersed tube shallower, making the floating transportation of the immersed tube easier and improving the safety of the floating transportation of the immersed tube; and it can reduce the excavation and deepening of the river under the floating transportation route of the immersed tube, and can save project investment. And the immersed tube can pour concrete into the cavity after the floating transportation is completed or when it is floated to the middle position, which can ensure the quality and safety of the immersed tube during use. The weight reduction component can adopt various steel structures with cavities, which can utilize the cavities to reduce weight and can ensure the quality of the immersed tube after pouring concrete into the cavities in the later stage.

[0056] As Figure 1 shown, the immersed tube is a standard pipe section with the same cross-sectional dimensions and is longitudinally symmetrically arranged left and right, which can ensure the balance of floating transportation.

[0057] In this embodiment, as Figure 1 、 Figure 10 shown, the weight reduction component includes a pre-embedded component with a pre-embedded steel pipe 3. The pre-embedded component formed by the pre-embedded steel pipe 3 is pre-embedded inside the reinforced concrete of the immersed tube, which is convenient for pre-embedding operation; the pre-embedded steel pipe 3 has a communication port communicating with the outside world. After floating transportation, concrete is poured into the inside of the pre-embedded steel pipe 3 through the communication port. The steel pipe concrete structure formed by the combination of the concrete and the steel pipe can perfectly integrate into the reinforced concrete of the immersed tube, making the quality of the immersed tube during use meet the pre-design requirements and meet the normal use conditions of the immersed tube.

[0058] As Figures 5 - 6 shown, in this embodiment, the communication port is preferably arranged above the top plate 11. The communication port is always above the water surface during floating transportation, which can prevent water from entering the pre-embedded steel pipe 3; and it is more convenient for pouring concrete in the later stage and can ensure the forming quality of pouring concrete into the pre-embedded steel pipe 3.

[0059] As Figures 4 - 6 shown, a protection pier 5 is arranged on the outer surface of the main body 1. The protection pier 5 is an anti-collision protection structure of the immersed tube. In this embodiment, the protection pier 5 has a groove 51, and at least part of the protection pier 5 is arranged corresponding to the communication port and the communication port is located inside the groove 51 of the corresponding protection pier 5. That is: at least part of the protection pier 5 is adjusted according to the position of the communication port, so that the communication port is located inside the groove 51 of the corresponding protection pier 5, so that the protection pier 5 not only serves as the anti-collision protection of the immersed tube, but also can protect the communication port and ensure that pouring can be smoothly realized in the later stage.

[0060] Embodiment 2

[0061] This embodiment provides an immersed tube for reducing the weight of reinforced concrete, which is refined on the basis of Embodiment 1. Refer to Figures 1 - 8, the embedded component includes an upper embedded steel pipe component, which is arranged in the top plate 11 of the main body 1. The upper embedded steel pipe component has a communication port.

[0062] In this embodiment, the upper embedded steel pipe components are arranged at intervals along the longitudinal direction of the immersed tube, which can ensure the strength of the top plate 11.

[0063] As Figure 1 , Figure 2 , Figures 4 - 8 As shown, the upper embedded steel pipe component includes a first embedded pipe 31, which is arranged horizontally along the top plate 11. Communication ports are provided at both ends and the middle of the first embedded pipe 31; communication ports are provided at both ends and the middle of the first embedded pipe 31. The communication ports at both ends are used as grouting ports to pour concrete, and the communication port in the middle is used as an exhaust port to discharge the first embedded pipe 31, which can ensure the pouring quality of the concrete in the first embedded pipe 31.

[0064] As Figure 1 and Figure 2 As shown, near the left end of the immersed tube, a jack pulling seat 23, a double-column mooring bitt 241, a guide rod 27, etc. are arranged on the top plate 11 at the left end of the immersed tube. To ensure the strength of the top plate 11 at the positions where these structures are arranged, the embedded steel pipe 3 is not buried at these positions to ensure the strength of the end of the top plate 11 of the immersed tube. And Figure 1 The two ends of the corresponding first embedded pipe 31 do not extend to the side wall 13, ensuring that the strength of the position of the top plate 11 where the double-column mooring bitt 241 is arranged meets the requirements.

[0065] As Figure 1 and Figure 3 As shown, the upper embedded steel pipe component further includes a second embedded pipe 32 and a third embedded pipe 33. The second embedded pipe 32 and the third embedded pipe 33 are located on the same cross-section of the main body 1. The second embedded pipe 32 and the third embedded pipe 33 are arranged horizontally along the top plate 11. There is a gap between the second embedded pipe 32 and the third embedded pipe 33, which is used to skip the position where the measuring tower 211 needs to be arranged on the top plate 11 of the immersed tube, so that the strength of the position where the measuring tower 211 is arranged on the top plate 11 of the immersed tube meets the requirements. Communication ports are respectively provided at both ends of the second embedded pipe 32 and both ends of the third embedded pipe 33. Specifically, the two ends of the second embedded pipe 32 and the end of the third embedded pipe 33 close to the side wall 13 of the immersed tube are grouting ports, and the ends close to the middle of the immersed tube are exhaust ports. First, it can ensure that the position of pouring concrete is the same as that of the first embedded pipe 31, making pouring more convenient; second, it can ensure the balance during pouring of concrete, and it is safer when pouring concrete on the water. And as Figures 3 - 5As shown, both ends of the first embedded pipe 31 extend to the side walls 13 on both sides of the body 1, and the part of the first embedded pipe 31 extending to the side wall 13 is inclined downward; the second embedded pipe 32 and the third pre-embedded pipe extend to the corresponding side walls 13, and the parts of the second embedded pipe 32 and the third embedded pipe 33 extending to the side wall 13 are inclined downward. One end of the first embedded pipe 31, the second embedded pipe 32, and the third embedded pipe 33 close to the side wall 13 can extend to the side wall 13, so that more weight can be reduced. And the part extending to the side wall 13 is inclined downward, which can adapt to the inner inclination of the corner of the immersed tube, such as Figure 5 shown; and it can strengthen the connection between the top plate 11 and the side wall 13 of the immersed tube, making the quality of the immersed tube better.

[0066] Such as Figure 1 and Figure 7 shown, both ends of the set first embedded pipe 31 do not extend to the side wall 13, avoiding the pipe section lifting point 25 of the immersed tube and ensuring the hoisting safety of the immersed tube. Such as Figure 1 and Figure 8 shown, both ends of the set first embedded pipe 31 do not extend to the side wall 13, avoiding the single-column mooring bitt 242 of the immersed tube, ensuring the strength of the top plate 11 at the single-column mooring bitt 242 of the immersed tube, and ensuring the safety of the mooring of the immersed tube.

[0067] Such as Figures 5 - 6 shown, the communication ports of the first embedded pipe 31, the second embedded pipe 32, and the third embedded pipe 33 are formed by the vertical through pipe 43 passing through the upper layer of the top plate 11 and the protection pier 5.

[0068] Embodiment 3

[0069] This embodiment provides an immersed tube for reducing the weight of reinforced concrete, which is refined on the basis of Embodiment 1. Refer to Figures 10 - 14 , the embedded component includes a lower embedded steel pipe component, and the lower embedded steel pipe component is arranged in the side wall 13 and the bottom plate 12 of the body 1, and the lower embedded steel pipe component has a communication port.

[0070] In this embodiment, the lower embedded steel pipe components are arranged at intervals along the longitudinal direction of the immersed tube, which can ensure the strength of the bottom plate 12 and the wall of the immersed tube.

[0071] In this embodiment, the lower embedded steel pipe component includes a horizontally arranged fourth embedded pipe 34 and at least three vertically arranged fifth embedded pipes 35. The fifth embedded pipes 35 communicate with the fourth embedded pipe 34 downward. The fourth embedded pipe 34 is arranged on the bottom plate 12, such as Figure 14 shown; the side wall 13 is provided with the fifth embedded pipe 35, at least one middle wall 14 of the body 1 is provided with the fifth embedded pipe 35, and the upper end of the fifth embedded pipe 35 has a communication port.

[0072] With this setting method, the connection between the bottom plate 12 and the immersed tube wall is good, and the weight of the immersed tube can be significantly reduced by making full use of the wall and bottom plate 12 of the immersed tube. The connection port at the upper end of the fifth embedded pipe 35 on the side wall 13 serves as the pouring port, and the connection port at the upper end of the fifth embedded pipe 35 on the middle wall 14 serves as the exhaust port, which can ensure the balance of pouring and make the pouring more convenient and safe.

[0073] As Figure 11 shown, the fifth embedded pipe 35 serving as the exhaust port is located in the left middle wall 14; as Figure 13 shown, the fifth embedded pipe 35 serving as the exhaust port is located in the right middle wall 14. Of course, in this embodiment, the fifth embedded pipe 35 can also be provided in both middle walls 14. As Figure 10 shown, the fifth embedded pipes 35 serving as the exhaust ports are arranged longitudinally and staggeredly in the two middle walls 14, which can ensure the strength of the middle wall 14 of the immersed tube on the premise of meeting the exhaust requirements and pouring balance.

[0074] As Figure 12 shown, the end of the fourth embedded pipe 34 is inclined upward to communicate with the lower end of the fifth embedded pipe 35 located on the side wall 13, which can adapt to the inclination of the inner corner of the immersed tube and facilitate the concrete poured from the connection port at the upper end of the fifth embedded pipe 35 on the side wall 13 to slowly flow to the middle of the fourth embedded pipe 34 at the inclined part of the end of the fourth embedded pipe 34, avoiding the accumulation of concrete at the end of the fourth embedded pipe 34 and causing difficulties in subsequent concrete pouring.

[0075] Embodiment 4

[0076] This embodiment provides an immersed tube for reducing the weight of reinforced concrete, which is refined on the basis of Embodiment 1. Refer to Figures 1 - 14 , the embedded component includes the upper embedded steel pipe component of Embodiment 2. The upper embedded steel pipe component is arranged in the top plate 11 of the body 1, and the upper embedded steel pipe component has a connection port; the embedded component also includes the lower embedded steel pipe component of Embodiment 3. The lower embedded steel pipe component is arranged in the side wall 13 and bottom plate 12 of the body 1, and the lower embedded steel pipe component has a connection port.

[0077] For standard pipe sections, when the degree of weight reduction of the immersed tube is low, due to the large number of outfitting parts on the top plate 11, the buried pipes affect the installation of the outfitting parts; while the construction difficulty of burying pipes in the bottom plate 12 and the wall is low. Lifting steel pipes is required for burying pipes in the top plate 11, which is relatively cumbersome. The increased weight of the steel pipes increases the load on the immersed tube formwork and raises potential risks; therefore, from the perspective of installation difficulty, the priority of burying the lower embedded steel pipe components in the bottom plate 12 and the wall is higher than that of burying the upper embedded steel pipe components in the top plate 11. When the weight reduction requirement is high, it is necessary to bury the lower embedded steel pipe components in the bottom plate 12 and the wall while burying the upper embedded steel pipe components in the top plate 11.

[0078] For variable cross-section pipe sections, compared with standard pipe sections, there are attitude leveling problems with variable cross-section pipe sections. It is relatively easy to calculate the leveling counterweight by burying steel pipes in the top plate 11. In addition, variable cross-section immersed tubes are relatively complex, and the construction difficulty of burying pipes in the bottom plate and wall is greater. When burying pipes in the top plate 11, compared with burying pipes in the bottom plate 12 and wall, the center of gravity of the immersed tube is lower, and it is not easy to become unstable during the floating transportation of the immersed tube. During the floating transportation process, the water pressure is mainly borne by the outer wall and bottom plate 12 of the immersed tube. Burying pipes in the top plate 11 makes the structure safer and helps to reduce construction safety and quality risks. Therefore, when the weight reduction degree of the immersed tube is low, the priority of burying the upper pre-buried steel pipe components in the top plate 11 is higher than that of burying the lower pre-buried steel pipe components in the bottom plate 12 and wall. When the weight reduction requirement of the immersed tube is high, it is necessary to bury the lower pre-buried steel pipe components in the bottom plate 12 and wall while burying the upper pre-buried steel pipe components in the top plate 11.

[0079] As Figure 9 shown, when the pre-buried assembly includes lower pre-buried steel pipe components and upper pre-buried steel pipe components, the lower pre-buried steel pipe components and the upper pre-buried steel pipe components are longitudinally staggered along the body 1.

[0080] During the casting of the immersed tube, the bottom plate 12 and the wall are cast together, and the top plate 11 is tied after the formwork of the bottom plate 12 and the wall is installed. First, the steel bars of the bottom plate 12 and the wall are tied and the fourth pre-buried pipe 34 and the fifth pre-buried pipe 35 are buried in it by the way. Then, the large cavity of the formwork enters, and only then can the steel bars of the top plate 11 be tied and the first pre-buried pipe 31, the second pre-buried pipe 32 and the third pre-buried pipe 33 be pre-buried. In order to set the upward communication port, the lower pre-buried steel pipe components and the upper pre-buried steel pipe components need to be longitudinally staggered along the body 1. Moreover, the thickness of the top plate 11 is limited, and there are also the positions of the protective layer and the steel bars. The staggered layout is conducive to ensuring the structural strength of the top plate 11, with better mechanical properties, and helps with quality control and safety control.

[0081] Moreover, when manufacturing the immersed tube that reduces the weight of reinforced concrete in the above-mentioned embodiments, cooling water can be injected into the pre-buried steel pipe to improve the heat dissipation effect of the concrete, and reduce the influence probability of cracks appearing on the concrete surface of the bottom plate and the side wall or the top plate; and the injected cooling water will not affect the quality of the secondary casting cavity in the later stage.

[0082] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A sunken pipe for reducing the weight of reinforced concrete, characterized in that, It includes a main body (1). There are weight-reducing components inside the reinforced concrete of the main body (1). The weight-reducing components have cavities, and the cavities can be used for pouring concrete. The weight-reducing components include a pre-embedded component with a pre-embedded steel pipe (3). The pre-embedded component includes an upper pre-embedded steel pipe member and a lower pre-embedded steel pipe member. The lower pre-embedded steel pipe member and the upper pre-embedded steel pipe member are longitudinally staggered along the main body (1). The upper pre-embedded steel pipe member is arranged in the top plate (11) of the main body (1). The upper pre-embedded steel pipe member includes a first pre-embedded pipe (31). The first pre-embedded pipe (31) is arranged horizontally along the top plate (11). Both ends and the middle of the first pre-embedded pipe (31) are provided with communication ports communicating with the outside. The upper pre-embedded steel pipe member includes a second pre-embedded pipe (32) and a third pre-embedded pipe (33). The second pre-embedded pipe (32) and the third pre-embedded pipe (33) are located on the same cross-section of the main body (1). The second pre-embedded pipe (32) and the third pre-embedded pipe (33) are arranged horizontally along the top plate (11). There is a gap between the second pre-embedded pipe (32) and the third pre-embedded pipe (33). Both ends of the second pre-embedded pipe (32) and both ends of the third pre-embedded pipe (33) are respectively provided with communication ports communicating with the outside. Both ends of the second pre-embedded pipe (32) and one end of the third pre-embedded pipe (33) close to the immersed tube side wall (13) are grouting ports, and one end close to the middle of the immersed tube is an exhaust port, ensuring that the position for pouring concrete is consistent with the first pre-embedded pipe (31). The lower pre-embedded steel pipe member is arranged in the side wall (13) and the bottom plate (12) of the main body (1). The lower pre-embedded steel pipe member includes a horizontally arranged fourth pre-embedded pipe (34) and at least three vertically arranged fifth pre-embedded pipes (35). The fifth pre-embedded pipes (35) communicate with the fourth pre-embedded pipe (34) downward. The fourth pre-embedded pipe (34) is arranged on the bottom plate (12). The side wall (13) is provided with the fifth pre-embedded pipes (35). At least one middle wall (14) of the main body (1) is provided with the fifth pre-embedded pipes (35). The upper ends of the fifth pre-embedded pipes (35) have communication ports communicating with the outside. The communication port at the upper end of the fifth pre-embedded pipe (35) on the side wall is used as a pouring port, and the communication port at the upper end of the fifth pre-embedded pipe (35) on the middle wall is used as an exhaust port. The communication port is located above the top plate (11). There are protection piers (5) on the outer surface of the main body (1). The protection piers (5) have grooves (51). At least part of the protection piers (5) are arranged corresponding to the communication ports, and the communication ports are located inside the grooves (51) of the corresponding protection piers (5).

2. The immersed tube for reducing the weight of reinforced concrete according to claim 1, characterized in that, When the upper pre-embedded steel pipe member includes the first pre-embedded pipe (31), both ends of the first pre-embedded pipe (31) extend to the side walls (13) on both sides of the main body (1), and the part of the first pre-embedded pipe (31) extending to the side wall (13) is arranged obliquely downward. When the upper pre-embedded steel pipe member includes the second pre-embedded pipe (32) and the third pre-embedded pipe (33), the second pre-embedded pipe (32) and the third pre-embedded pipe extend to the corresponding side walls (13), and the parts of the second pre-embedded pipe (32) and the third pre-embedded pipe extending to the side wall (13) are arranged obliquely downward.

3. The immersed tube for reducing the weight of reinforced concrete according to claim 1, characterized in that, The end of the fourth pre-embedded pipe (34) communicates with the lower end of the fifth pre-embedded pipe (35) located on the side wall (13) obliquely upward.

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