Combined immersed tube segment for immersed tube tunnel and construction method

Abstract

The present invention discloses a combined immersed tube segment for an immersed tube tunnel and a construction method. The combined immersed tube segment for an immersed tube tunnel comprises: a segment body, the segment body being a reinforced concrete structure, the segment body comprising a top plate, a bottom plate, side walls, and a middle wall, the top plate, the bottom plate, the side walls, and the middle wall enclosing a tunnel for vehicles; an inner lining steel plate, the inner lining steel plate being disposed on the inner side wall of the tunnel; a tubular cavity, the tubular cavity being disposed on the outer side wall of the inner lining steel plate and embedded within the segment body, the top plate being provided with a grouting hole and a first exhaust hole communicating with the interior of the tubular cavity; and a water tank, the water tank being detachably disposed within the tunnel. The above structure can reduce the draft of the immersed tube segment during floating transportation and eliminates the need for large trusses when casting the segment body, thereby reducing the construction cost and construction difficulty of the immersed tube tunnel.

Description

Technical Field

[0001] The present invention relates to the technical field of immersed tube tunnels, and in particular to a combined immersed tube segment for an immersed tube tunnel and a construction method thereof. Background Art

[0002] In the prior art, immersed tube tunnel refers to an underwater tunnel constructed by prefabricating pipe sections at a prefabrication site through processes such as floating, sinking, and docking. It is generally a reinforced concrete rectangular cross-section structure. In order to meet the requirements of river navigation scale and related burial depth, the load that the immersed tube tunnel structure needs to bear is relatively large. In order to make the immersed tube tunnel structure have corresponding structural strength, conventional immersed tube sections usually have a large weight, resulting in a deeper draft of conventional immersed tube sections during floating. In order to meet the freeboard height of the immersed tube sections during floating, conventional immersed tube sections usually have a high height, which leads to a high engineering cost of the immersed tube tunnel. Among them, for inland waterways with shallow water depths, in order to meet the requirements of immersed tube The requirement for floating pipe segments requires dredging of the floating channel. In particular, when rock drilling is required for the floating channel, the construction difficulty of the immersed tube tunnel will be significantly increased, thereby extending the construction period of the immersed tube tunnel. In addition, in order to avoid the phenomenon of cracks caused by inconsistent shrinkage of each layer of concrete due to the layered casting method when casting the immersed tube segments, the immersed tube segments are usually cast in one go using the full-section casting method. In order to bear the concrete pressure brought about by the full-section casting method, large trusses that need to be dismantled after construction are usually required to support the detachable inner formwork. The cost of large trusses is high and the construction process is relatively complicated, further increasing the project cost and construction difficulty of the immersed tube tunnel. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a modular immersed tube segment for an immersed tube tunnel. This reduces the draft of the immersed tube segment during floating and eliminates the need for large trusses when casting the segment body, thereby reducing the construction cost and ease of construction difficulty of the immersed tube tunnel.

[0004] The present invention also provides a construction method for the combined immersed tube segment used in the immersed tube tunnel.

[0005] According to the first embodiment of the present invention, a combined immersed tube segment for an immersed tube tunnel includes: a segment body, which is a reinforced concrete structure, and includes a top plate, a bottom plate, side walls and a middle wall, and the top plate, the bottom plate, the side walls and the middle wall together form a tunnel for driving; an inner lining steel plate, which is arranged on the inner wall of the tunnel; a tubular cavity, which is arranged on the outer wall of the inner lining steel plate and embedded in the interior of the segment body, and the top plate is provided with a grouting hole and a first exhaust hole connected to the inside of the tubular cavity; a water tank, which is detachably arranged in the tunnel.

[0006] The combined immersed tube segment for an immersed tube tunnel according to an embodiment of the present invention has at least the following beneficial effects: by arranging a tubular cavity embedded in the tube segment body on the outer side wall of the inner lining steel plate, it is helpful to reduce the weight of the immersed tube segment during floating transportation, thereby helping to reduce the draft of the immersed tube segment during floating transportation, and helping to reduce the height of the immersed tube segment while meeting the freeboard height of the immersed tube segment during floating transportation, thereby helping to reduce the project cost. At the same time, reducing the draft of the immersed tube segment during floating transportation is helpful to reduce the amount of rock drilling construction during the dredging of the floating channel, thereby helping to reduce the construction difficulty of the immersed tube tunnel, and further helping The construction period of the immersed tube tunnel is shortened. When the immersed tube segment needs to be sunk, concrete is poured into the tubular cavity through the grouting hole and water is injected into the water tank to increase the weight of the immersed tube segment. In addition, the inner lining steel plate can be used as an inner formwork for casting the segment body. The tubular cavity provided on the outer wall of the inner lining steel plate can enhance the structural strength and bearing capacity of the inner lining steel plate, so that the inner lining steel plate does not need to be provided with a large truss when used as an inner formwork to bear the concrete pressure brought by the full-section casting method for casting the segment body, which is conducive to further reducing the engineering cost and construction difficulty of the immersed tube tunnel.

[0007] According to some embodiments of the present invention, the tubular cavity is formed by enclosing the inner lining steel plate and a steel shell welded to the outer side wall of the inner lining steel plate.

[0008] According to some embodiments of the present invention, the cross-section of the tubular cavity is rectangular.

[0009] According to some embodiments of the present invention, the tubular cavity is wound around the outer side wall of the lining steel plate in an end-to-end manner.

[0010] According to some embodiments of the present invention, there are multiple tubular cavities, and the multiple tubular cavities are arranged at intervals along the length direction of the lining steel plate.

[0011] According to some embodiments of the present invention, a portion of the lining steel plate corresponding to the bottom plate and avoiding the tubular cavity is provided with a casting hole and a second exhaust hole.

[0012] According to some embodiments of the present invention, a plurality of the casting holes and the second exhaust holes are provided, the plurality of the casting holes are spaced apart along the length direction of the tubular cavity, and at least one second exhaust hole is provided between two adjacent casting holes.

[0013] According to some embodiments of the present invention, the lining steel plate is provided with a first bolt embedded in the interior of the pipe segment body.

[0014] According to some embodiments of the present invention, the tubular cavity is provided with a second peg embedded in the pipe segment body.

[0015] A construction method according to a second embodiment of the present invention, which is applied to a combined immersed tube segment for an immersed tube tunnel according to the first embodiment of the present invention, comprises the following steps:

[0016] S1: Processing and manufacturing an inner lining steel plate, welding a tubular cavity on the outer side wall of the inner lining steel plate, welding a first bolt to an area of ​​the outer side wall of the inner lining steel plate avoiding the tubular cavity, and welding a second bolt to the tubular cavity;

[0017] S2: Setting up the bottom steel plate and outer formwork for casting the pipe segment body, lifting and positioning the inner lining steel plate to a preset position to serve as the inner formwork for casting the pipe segment body, and setting anti-floating connectors between the inner lining steel plate and the bottom steel plate;

[0018] S3: Use the full-section casting method to cast the pipe segment body. After forming, remove the outer formwork and set up a water tank in the pipe gallery to form the immersed tube segment;

[0019] S4: Float the immersed tube segments to the tunnel site, pour concrete into the tubular cavity through the grouting holes, and fill the water tank with water to sink and connect the immersed tube segments. Pour a concrete weight layer on the bottom plate to replace the water in the water tank and remove the water tank to complete the installation of the immersed tube segments.

[0020] According to the construction method of an embodiment of the present invention, there are at least the following beneficial effects: during the construction process, by setting the anti-floating connector, the lining steel plate can be prevented from floating up during the casting of the pipe segment body and the static forming of the pipe segment body, which is beneficial to improving the manufacturing accuracy of the pipe segment body.

[0021] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0023] Figure 1 This is a schematic diagram of the overall structure of the combined immersed tube segments for an immersed tube tunnel according to an embodiment of the present invention before being sunk and connected;

[0024] Figure 2 yes Figure 1 A partial enlarged schematic diagram in the middle;

[0025] Figure 3 This is a schematic diagram of the partial structure of the combined immersed tube section at the top plate for an immersed tube tunnel according to an embodiment of the present invention;

[0026] Figure 4 yes Figure 3 A partial enlarged schematic diagram of point B in the middle;

[0027] Figure 5 This is a schematic diagram of the partial structure of a combined immersed tube segment for an immersed tube tunnel according to an embodiment of the present invention at the bottom plate from a top view;

[0028] Figure 6 This is a schematic diagram of the overall structure of the pipe segment body when being cast according to an embodiment of the present invention;

[0029] Figure 7 It is a schematic diagram of the overall structure of the combined immersed tube segments for an immersed tube tunnel after being sunk and docked according to an embodiment of the present invention.

[0030] Reference numerals:

[0031] Top plate 110, grouting hole 111, first vent hole 112, bottom plate 120, side wall 130, middle wall 140, pipe gallery 200, lining steel plate 300, pouring hole 310, second vent hole 320, first bolt 330, tubular cavity 400, second bolt 410, water tank 500, bottom steel plate 600, outer formwork 700, anti-floating connector 800, concrete weight layer 900. DETAILED DESCRIPTION

[0032] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0033] In the description of the present invention, it should be understood that if orientation descriptions are involved, the orientations or positional relationships indicated, such as up, down, front, back, left, and right, are based on the orientations or positional relationships shown in the accompanying drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0034] In the description of the present invention, if the words such as several, greater than, less than, exceed, above, below, within, etc. appear, among which, several means one or more, and more means more than two, greater than, less than, exceed, etc. are understood as not including the number itself, and above, below, within, etc. are understood as including the number itself.

[0035] In the description of the present invention, if words such as first and second appear, they are only used to distinguish technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0036] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0037] Reference Figure 1 and Figure 2 The combined immersed tube segment for an immersed tube tunnel according to an embodiment of the present invention includes a segment body, an inner lining steel plate 300, a tubular cavity 400 and a water tank 500.

[0038] The main body of the pipe section is a reinforced concrete structure, and the main body of the pipe section includes a top plate 110, a bottom plate 120, a side wall 130 and a middle wall 140. The top plate 110, the bottom plate 120, the side wall 130 and the middle wall 140 enclose a pipe gallery 200 for driving. The lining steel plate 300 is arranged on the inner wall of the pipe gallery 200, and the tubular cavity 400 is arranged on the outer wall of the lining steel plate 300 and embedded in the interior of the pipe section body. The top plate 110 is provided with a grouting hole 111 and a first exhaust hole 112 connected to the interior of the tubular cavity 400, and the water tank 500 is detachably arranged in the pipe gallery 200.

[0039] By providing a tubular cavity 400 embedded in the pipe segment body on the outer wall of the inner lining steel plate 300, it is helpful to reduce the weight of the immersed pipe segment during floating transportation, thereby helping to reduce the draft of the immersed pipe segment during floating transportation. On the premise of meeting the freeboard height of the immersed pipe segment during floating transportation, it is helpful to reduce the height of the immersed pipe segment, thereby helping to reduce the project cost. At the same time, reducing the draft of the immersed pipe segment during floating transportation is helpful to reduce the amount of rock drilling construction during the dredging of the floating channel, thereby helping to reduce the construction difficulty of the immersed tube tunnel, and further helping to shorten the construction period of the immersed tube tunnel. According to statistics, for a conventional 2-kilometer-long floating channel, by reducing the draft, the freeboard height of the immersed pipe segment during floating transportation can be increased by 1 meter, which can reduce the amount of rock drilling by 120,000 to 150,000 cubic meters. This greatly shortens the construction period of the immersed tube tunnel. When it is necessary to sink the immersed tube segment, concrete is poured into the tubular cavity 400 through the grouting hole 111 and water is poured into the water tank 500 to increase the weight of the immersed tube segment. In addition, the lining steel plate 300 can be used as an inner formwork for casting the segment body, wherein the tubular cavity 400 arranged on the outer wall of the lining steel plate 300 can enhance the structural strength and bearing capacity of the lining steel plate 300, so that the lining steel plate 300 does not need to be set up as an inner formwork to bear the concrete pressure brought by the full-section casting method for casting the segment body, which is beneficial to further reduce the engineering cost and construction difficulty of the immersed tube tunnel. Moreover, the lining steel plate 300 can enhance the bearing capacity of the segment body, which is beneficial to extend the service life of the segment body.

[0040] Reference Figure 1 and Figure 3 In some embodiments, a plurality of grouting holes 111 and a plurality of first exhaust holes 112 are provided, and the plurality of grouting holes 111 are spaced apart along the length direction of the tubular cavity 400. At least one first exhaust hole 112 is provided between two adjacent grouting holes 111, which helps to reduce the difficulty of pouring concrete into the tubular cavity 400. The diameter of the grouting hole 111 is 0.2m to 0.3m, and the diameter of the first exhaust hole 112 is 0.08m to 0.1m.

[0041] It should be noted that, in some embodiments, the tubular cavity 400 is formed by an inner lining steel plate 300 and a steel shell welded to the outer wall of the inner lining steel plate 300. The structure is simple and easy to implement. Specifically, the inner lining steel plate 300 and the steel shell are both made of Q355 or above steel, wherein the thickness of the inner lining steel plate 300 is 16mm to 40mm, and the thickness of the steel shell is 10mm to 30mm.

[0042] Reference Figure 3 In some embodiments, the cross-section of the tubular cavity 400 is rectangular, which helps to reduce the difficulty of welding the tubular cavity 400.

[0043] It should be noted that, in some embodiments, the tubular cavity 400 and the lining steel plate 300 may also be integrally formed by a mold, which is not limited here.

[0044] Reference Figure 1 and Figure 6 In some embodiments, the tubular cavity 400 is connected end to end and wrapped around the outer wall of the lining steel plate 300, which is beneficial to increasing the capacity of the tubular cavity 400, thereby further reducing the weight of the immersed tube section during floating transportation, and at the same time helping to comprehensively enhance the structural strength and bearing capacity of the lining steel plate 300.

[0045] Reference Figure 3 and Figure 5 In some embodiments, there are multiple tubular cavities 400, and the multiple tubular cavities 400 are spaced apart along the length direction of the lining steel plate 300, which is beneficial to increasing the capacity of the tubular cavity 400, thereby further reducing the weight of the immersed tube section during floating transportation, and at the same time helping to comprehensively enhance the structural strength and bearing capacity of the lining steel plate 300.

[0046] It should be noted that, in some embodiments, the distance between two adjacent tubular cavities 400 is 2 to 3 times the width of the tubular cavity 400 .

[0047] It should be noted that in some embodiments, the tubular cavity 400 is completely embedded in the pipe segment body, wherein the depth of the tubular cavity 400 embedded in the top plate 110, the bottom plate 120, the side wall 130 and the middle wall 140 is 1 / 2 to 2 / 3 of the thickness of the corresponding structure.

[0048] Reference Figure 5 In some embodiments, a portion of the lining steel plate 300 corresponding to the bottom plate 120 that avoids the tubular cavity 400 is provided with a casting hole 310 and a second exhaust hole 320, which can assist in casting the bottom plate 120 when casting the pipe segment body, thereby helping to improve the density of the concrete at the bottom plate 120.

[0049] Reference Figure 5 In some embodiments, a plurality of casting holes 310 and a plurality of second exhaust holes 320 are provided, and the plurality of casting holes 310 are spaced apart along the length direction of the tubular cavity 400, and at least one second exhaust hole 320 is provided between two adjacent casting holes 310, which helps to reduce the difficulty of casting the pipe section body.

[0050] Reference Figure 3 and Figure 4In some embodiments, the lining steel plate 300 is provided with a first bolt 330 embedded in the pipe segment body, which is beneficial to enhancing the connection strength between the pipe segment body and the lining steel plate 300, thereby helping the lining steel plate 300 to stably enhance the bearing capacity of the pipe segment body.

[0051] Reference Figures 2 to 4 In some embodiments, a second bolt 410 embedded in the pipe segment body is provided on the tubular cavity 400 , which is beneficial to further enhance the connection strength between the pipe segment body and the lining steel plate 300 .

[0052] Reference Figure 1 、 Figure 6 and Figure 7 According to an embodiment of the present invention, a construction method applied to the aforementioned combined immersed tube segment for an immersed tube tunnel comprises the following steps:

[0053] S1: Using immersed tube segments as construction units, the lining steel plate 300 is processed and fabricated, and a tubular cavity 400 is welded to the outer wall of the lining steel plate 300. A first bolt 330 is welded to the outer wall of the lining steel plate 300, avoiding the area of ​​the tubular cavity 400, and a second bolt 410 is welded to the tubular cavity 400.

[0054] S2: Setting up the bottom steel plate 600 and the outer formwork 700 for casting the pipe segment body, lifting and positioning the inner lining steel plate 300 to a preset position to serve as the inner formwork for casting the pipe segment body, and installing an anti-floating connector 800 between the inner lining steel plate 300 and the bottom steel plate 600. Specifically, the anti-floating connector 800 is installed between the tubular cavity 400 at the bottom of the inner lining steel plate 300 and the bottom steel plate 600;

[0055] S3: Cast the pipe segment body using the full-section casting method. After forming, remove the outer formwork 700 and install a water tank 500 in the pipe gallery 200 to form an immersed pipe segment.

[0056] S4: Float the immersed tube segment to the tunnel site area, pour concrete into the tubular cavity 400 through the grouting holes 111 and fill water into the water tank 500 to sink and connect the immersed tube segment, pour a concrete weight layer 900 on the bottom plate 120 to replace the water in the water tank 500 and remove the water tank 500 to complete the installation of the immersed tube segment.

[0057] During the construction process, the anti-floating connector 800 is provided to prevent the lining steel plate 300 from floating during the casting of the pipe segment body and the static forming of the pipe segment body, thereby improving the manufacturing accuracy of the pipe segment body.

[0058] It should be noted that, in some embodiments, the concrete poured into the tubular cavity 400 is self-compacting concrete, which is beneficial to improving the density of the concrete in the tubular cavity 400 .

[0059] Throughout this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," and "some examples" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. Throughout this specification, illustrative uses of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0060] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A construction method for a combined immersed tube segment for an immersed tube tunnel, characterized in that: The combined immersed tube segment for the immersed tube tunnel comprises: A pipe segment body, the pipe segment body being a reinforced concrete structure, the pipe segment body comprising a top plate (110), a bottom plate (120), side walls (130) and a middle wall (140), the top plate (110), the bottom plate (120), the side walls (130) and the middle wall (140) enclosing to form a pipe gallery (200) for driving; an inner lining steel plate (300), the inner lining steel plate (300) being arranged on the inner side wall of the pipe gallery (200); a tubular cavity (400), the tubular cavity (400) being arranged on the outer side wall of the inner lining steel plate (300) and embedded in the interior of the pipe segment body, the top plate (110) being provided with a grouting hole (111) and a first exhaust hole (112) communicating with the interior of the tubular cavity (400); a water tank (500), the water tank (500) being detachably disposed in the pipe gallery (200); The inner lining steel plate (300) is provided with a first bolt (330) embedded in the pipe segment body; The tubular cavity (400) is provided with a second peg (410) embedded in the interior of the pipe segment body; Wherein, the construction method comprises the following steps: S1: Processing and manufacturing the inner lining steel plate (300), welding and processing the tubular cavity (400) on the outer wall of the inner lining steel plate (300), welding the first bolt (330) to the outer wall of the inner lining steel plate (300) avoiding the area of ​​the tubular cavity (400), and welding the second bolt (410) to the tubular cavity (400); S2: Setting up the bottom steel plate (600) and the outer formwork (700) for casting the pipe segment body, lifting and positioning the inner lining steel plate (300) to a preset position to serve as the inner formwork for casting the pipe segment body, and setting an anti-floating connector (800) between the inner lining steel plate (300) and the bottom steel plate (600); S3: Casting the pipe segment body using a full-section casting method, removing the outer formwork (700) after forming, and setting a water tank (500) in the pipe gallery (200) to form a submerged pipe segment; S4: Float the immersed tube segment to the tunnel site, pour concrete into the tubular cavity (400) through the grouting hole (111), and inject water into the water tank (500) to sink and connect the immersed tube segment, pour a concrete weight layer (900) on the bottom plate (120) to replace the water in the water tank (500), and remove the water tank (500) to complete the installation of the immersed tube segment.

2. The construction method according to claim 1, wherein: The tubular cavity (400) is formed by enclosing the inner lining steel plate (300) and a steel shell welded to the outer side wall of the inner lining steel plate (300).

3. The construction method according to claim 2, wherein: The cross section of the tubular cavity (400) is rectangular.

4. The construction method according to claim 1, wherein: The tubular cavity (400) is wound around the outer side wall of the lining steel plate (300) in an end-to-end manner.

5. The construction method according to claim 1, wherein: There are a plurality of tubular cavities (400), and the plurality of tubular cavities (400) are arranged at intervals along the length direction of the lining steel plate (300).

6. The construction method according to claim 1, wherein: A pouring hole (310) and a second exhaust hole (320) are provided in a region of the lining steel plate (300) corresponding to the bottom plate (120) and avoiding the tubular cavity (400).

7. The construction method according to claim 6, wherein: A plurality of the casting holes (310) and the second exhaust holes (320) are provided. The plurality of casting holes (310) are spaced apart along the length direction of the tubular cavity (400), and at least one second exhaust hole (320) is provided between two adjacent casting holes (310).

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