EP3702535A1

EP3702535A1 - Fire protection structure applied to segment joint of immersed tunnel and having linear moving mechanism

Info

Publication number: EP3702535A1
Application number: EP18900311.4A
Authority: EP
Inventors: Shujie PAN; Jun He; Changqing Chen; Anqi TONG
Original assignee: China State Construction Engineering Hong Kong Ltd
Current assignee: China State Construction Engineering Hong Kong Ltd
Priority date: 2018-01-10
Filing date: 2018-05-25
Publication date: 2020-09-02
Anticipated expiration: 2038-05-25
Also published as: CN107989071A; CN107989071B; EP3702535A4; WO2019136904A1; EP3702535B1

Abstract

The present disclosure provides a fireproof structure of a tube joint of an immersed tube tunnel with a linear moving mechanism including a waterproof tape assembly (10) and a fireproof assembly (30) both connected between adjacent first and second tubes (40, 50). The fireproof assembly (30) includes a protection plate assembly (31) including a first fireproof plate assembly (311), a second fireproof plate assembly (313) spaced from the first fireproof plate assembly (311), and a heat insulation piece (312) fixedly connected between the first fireproof plate assembly (311) and the second fireproof plate assembly (313); a movable connection assembly (33), the first fireproof plate assembly (311) and second fireproof plate assembly (313) being movably connected to the second tube (50) through the movable connection assembly (33); and a flexible fireproof belt (35) between the first fireproof plate assembly (311) and the second fireproof plate assembly (313), one end of the flexible fireproof belt (35) being connected with the heat insulation piece (312), and the other end being connected with the second tube (50).

Description

FIELD

The present disclosure relates to the technical field of immersed tube tunnel, in particular to a fireproof structure of a tube joint of an immersed tube tunnel with a linear moving mechanism.

BACKGROUND

In the construction of tunnel by immersed tube method, the joint between two adjacent tubes needs to be provided with waterproof components, such as rubber sealing strips, to prevent external moisture from penetrating into the tube through the joint. The waterproof components must meet the fireproof requirements within the design life (e.g. 120 years) in addition to the longitudinal stretching displacement of the tunnel tubes, so as to ensure the overall fireproof performance of the tunnel structure. If there is a fire in the tubes, the fire is bound to affect the service life of the waterproof components. Therefore, the current common practice is to set up a protection plate to meet the fireproof requirements of the waterproof components. However, the existing fireproof plate has the following problems of that the tests shows the existing fireproof design with only the fireproof plate meets the two-hour fireproof requirement. That is, the fire in the tubes will not affect the waterproof components within two hours, and the two-hour fireproof time limit cannot meet the effective fireproof requirement. At the same time, the two adjacent tubes need generate a longitudinal displacement, and the existing joint structure only provided with one fireproof plate cannot meet the displacement requirement.

SUMMARY

The main objective of the present disclosure is to provide a fireproof structure of a tube joint of an immersed tube tunnel with a linear moving mechanism, aiming to enable a fireproof assembly to simultaneously meet the requirements of fireproof aging and displacement.
In order to realize the above objective, the present disclosure provide a fireproof structure of a tube joint of an immersed tube tunnel with a linear moving mechanism, which includes a waterproof tape assembly and a fireproof assembly, the waterproof tape assembly and the fireproof assembly being connected between a first tube of the immersed tube tunnel and a second tube of the immersed tube tunnel adjacent to the first tube, the fireproof assembly being spaced from the waterproof tape assembly and positioned at an inner side of the waterproof tape assembly, and the fireproof assembly including:

a protection plate assembly, including a first fireproof plate assembly, a second fireproof plate assembly spaced from the first fireproof plate assembly, and a heat insulation piece fixedly connected between the first fireproof plate assembly and the second fireproof plate assembly;
a movable connection assembly, including a first movable connection piece fixed to the second tube and abutted against a side of the first fireproof plate assembly remote from the second fireproof plate assembly, and the first movable connection piece defining a first strip-shaped hole; the movable connection assembly further includes a first limiting column convexly arranged on a surface of the first fireproof plate assembly facing away from the second fireproof plate assembly and passed through the first strip-shaped hole; one end of the first fireproof plate assembly remote from the second tube being fixedly connected with the first tube; the movable connection assembly further includes a second movable connection piece, one end of the second fireproof plate assembly being fixedly connected with the first tube, and the other end of the second fireproof plate assembly being movably connected with the second tube through the second movable connection piece; and
a flexible fireproof belt positioned between the first fireproof plate assembly and the second fireproof plate assembly, and connecting the heat insulation piece and the second tube.

Optionally, the movable connection assembly further includes a stopper abutted on a side of the first movable connection piece facing away from the first fireproof plate assembly and fixedly connected to the first limiting column.
Optionally, the first fireproof plate assembly includes a first connection hole, the stopper defining a second connection hole, and the first limiting column being configured to pass through the first connection hole, the first strip-shaped hole and the second connection hole to fixedly connect the first fireproof plate assembly and the stopper.
Optionally, the first fireproof plate assembly includes a first fireproof plate and a fixed fireproof plate, the first fireproof plate being fixedly connected with the first tube, the fixed fireproof plate being positioned between the first fireproof plate and the second tube, the protection plate assembly further includes a connection piece, and the first fireproof plate, the fixed fireproof plate, the heat insulation piece and the second fireproof plate assembly being all fixedly connected with the connection piece; and the first connection hole is defined on the fixed fireproof plate.
Optionally, the first fireproof plate includes three layers of fireproof composite plates stacked on one another, the three layers of fireproof composite plates are fixedly connected with the connection piece, the fixed fireproof plate includes three layers of fixed fireproof composite plates stacked on one another, the three layers of fixed fireproof composite plates are fixedly connected with the connection piece, the first connection hole is configured to penetrate through the three layers of fixed fireproof composite plates, and one of the fireproof composite plates is butted with one of the fixed fireproof composite plate.
Optionally, a thickness of each of the fireproof composite plates of the second fireproof plate assembly is h2, 9.5 mm ≤ h2 ≤ 12 mm.
Optionally, the second movable connection piece is fixedly connected with the second tube and abutted on a surface of the second fireproof plate assembly remote from the first fireproof plate assembly, the second movable connection piece defines a second strip-shaped hole, the movable connection assembly further includes a second limiting column, the second limiting column is convexly arranged on the surface of the second fireproof plate assembly remote from the first fireproof plate assembly and passed through the second strip-shaped hole, and an end of the second limiting column is configured to be abutted against a surface of the movable connection assembly opposite to the second fireproof plate assembly.
Optionally, the second movable connection piece further includes a hanger and a fireproof cover plate, the hanger is fixedly connected with the second tube and abuts against the side of the fireproof cover plate facing away from the second fireproof plate assembly, the second strip-shaped hole penetrates through the hanger and the fireproof cover plate, and the end of the second limiting column abuts against the side of the hanger facing away from the fireproof cover plate.
Optionally, the hanger includes a first connection arm and a second connection arm forming an included angle with the first connection arm, the first connection arm is configured to be fixedly connected with the second tube, the second connection arm is configured to be fixedly connected with the fireproof cover plate, and the second strip-shaped hole is configured to be penetrated through the second connection arm.
Optionally, the second fireproof plate assembly includes three layers of fireproof composite plates which are stacked on one another and fixedly connected, and the second limiting column is convexly arranged on one of the fireproof composite plates adjacent to the second movable connection piece.
Optionally, the thickness of each fireproof composite plate of the second fireproof plate assembly is h2, 9.5 mm ≤ h2 ≤ 12 mm.
Optionally, an end face of the first tube and an adjacent end surface of the second tube are respectively convexly provided with a first connecting section and a second connecting section, the waterproof tape assembly is configured to be connected to the first connecting section and the second connecting section, the waterproof tape assembly, the first connecting section, the second connecting section, the end face of the first tube, and the end face of the second tube, and the first fireproof plate assembly are enclosed to form a fireproof space, and the second fireproof plate assembly and the heat insulation piece are positioned in the fireproof space.
In the technical scheme of the present disclosure, the waterproof tape assembly is installed between adjacent first and second tubes to prevent external moisture from entering the tubes, and the first and second tubes can be any two adjacent tubes. The fireproof assembly is arranged on the inner side of the waterproof tape assembly, so that the fire in the tube can be prevented from affecting the waterproof tape assembly, and the waterproof tape assembly can be protected. Further, the fireproof assembly is configured to include a first fireproof plate, a heat insulation piece and a second fireproof plate. If a fire breaks out in the tubes, the fire can be blocked by the three-layer structure including the first fireproof plate, the heat insulation piece and the second fireproof plate gradually, so that the influence of the fire in the tubes on the waterproof tape assembly is minimized. Tests show that the fireproof design described above can at least meet the four-hour fireproof requirement. That is, the fire in the tubes will not affect the waterproof tape assembly within four hours, thereby greatly improving the service life of the waterproof tape assembly.
One end of the first fireproof plate assembly and one end of the second fireproof plate assembly are both fixedly connected with the first tube, and the other ends of the first fireproof plate assembly and the second fireproof plate assembly are movably connected with the second tube through the movable connection assembly. The movable connection assembly includes a first movable connection piece and a second movable connection piece, and the first movable connection piece and the second movable connection piece both have a fireproof plate structure. Specifically, the first movable connection piece is fixed on the second tube and is abutted against a side of the first fireproof plate assembly far away from the second fireproof plate assembly, the first movable connection piece is provided with a first strip-shaped hole, a surface of the first fireproof plate assembly facing away from the second fireproof plate is convexly provided with a first limiting column, the first limiting column is configured to be passed through the first strip-shaped hole. The first limiting column is configured to relatively move in the first strip-shaped hole so as to change a distance between the first tube and the second tube in a longitudinal direction. When the distance between the first tube and the second tube becomes larger, the first tube and the second tube can still be blocked by the first limiting column, for maintaining a good fire performance. The second fireproof plate assembly is movably connected with the second tube through the second movable connection piece, so that when the longitudinal distance between the first tube and the second tube becomes larger, the first tube and the second tube are further blocked by the second movable connection piece, and the fireproof performance of the connection part of the tubes is improved.

BRIEF DESCRIPTION OF THE DRAWINGS

To better illustrate the technical solutions that are reflected in various embodiments according to this disclosure or that are found in the prior art, the accompanying drawings intended for the description of the embodiments herein or for the prior art will now be briefly described, it is evident that the accompanying drawings listed in the following description show merely some embodiments according to this disclosure, and that those having ordinary skill in the art will be able to obtain other drawings based on the arrangements shown in these drawings without making inventive efforts.

Fig. 1 is a structural schematic diagram of a fireproof structure of a tube joint of an immersed tube tunnel with a linear moving mechanism according to an embodiment of the present disclosure;
Fig. 2 is an enlarged view of portion A in Fig. 1;
Fig. 3 is an enlarged view of portion B in Fig. 2; and
Fig. 4 is an enlarged view of portion C in Fig. 2.

Labels illustration for drawings:

Table 1

Label	Name	Label	Name
10	waterproof tape assembly	3331	hanger
30	fireproof assembly	3331a	first connection arm
31	protection plate assembly	3331b	second connection arm
311	first fireproof plate assembly	3332	second strip-shaped hole
3111	fireproof plate	3333	fireproof cover plate
3111a	fireproof composite plate	334	first limiting column
3113	fixed fireproof plate	335	second limiting column
3113a	fixed fireproof composite plate	34	auxiliary fire belt
312	heat insulation piece	35	flexible fireproof belt
313	second fireproof plate assembly	36	connection piece
33	movable connection assembly	40	first tube
331	first movable connection piece	41	first connecting section
3311	first strip-shaped hole	50	second tube
332	stopper	51	second connecting section
333	second movable connection piece

The realization of the aim, functional characteristics, advantages of the present disclosure are further described specifically with reference to the accompanying drawings and embodiments.

DETAILED DESCRIPTION

The technical solutions of the embodiments of the present disclosure will be clearly and completely described in the following with reference to the accompanying drawings. It is obvious that the embodiments to be described are only a part rather than all of the embodiments of the present disclosure. All other embodiments obtained by persons skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
It is to be understood that, all of the directional instructions in the exemplary embodiments of the present disclosure (such as top, down, left, right, front, back......) can only be used for explaining relative position relations, moving condition of the elements under a special form (referring to figures), and so on, if the special form changes, the directional instructions changes accordingly.
In this present disclosure, the terms "connected" and "fixed" and the like shall be understood broadly unless otherwise specified and defined. For example, "fixed" may be a fixed connection, a detachable connection, or an integral part. It can be mechanical connection or electrical connection. It can be directly connected or indirectly connected through an intermediate medium, and it can be the communication between two elements or the interaction between two elements, unless otherwise explicitly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this present disclosure can be understood according to specific situations.
In addition, the descriptions, such as the "first", the "second" in the exemplary embodiment of present disclosure, can only be used for describing the aim of description, and cannot be understood as indicating or suggesting relative importance or impliedly indicating the number of the indicated technical character. Therefore, the character indicated by the "first", the "second" can express or impliedly include at least one character. In addition, the technical proposal of each exemplary embodiment can be combined with each other, however the technical proposal must base on that the ordinary skill in that art can realize the technical proposal, when the combination of the technical proposals occurs contradiction or cannot realize, it should consider that the combination of the technical proposals does not existed, and is not contained in the protection scope required by the present disclosure.
Referring to Figs. 1 to 4, the present disclosure proposes a fireproof structure of a tube joint of an immersed tube tunnel with a linear moving mechanism.
In the embodiment of the present disclosure, the tube joint of the immersed tube tunnel with the linear moving mechanism includes a waterproof tape assembly 10 and a fireproof assembly 30. The waterproof tape assembly 10 and the fireproof assembly 30 are connected between a first tube 40 of the immersed tube tunnel and a second tube 50 of the immersed tube tunnel adjacent to the immersed tube tunnel tube. The fireproof assembly 30 is separated from the waterproof tape assembly 10 and positioned at an inner side of the waterproof tape assembly 10. The fireproof assembly 30 includes:

a protection plate assembly 31, including a first fireproof plate assembly 311 and a second fireproof plate assembly 313 which are arranged at intervals, and
a heat insulation piece 312 fixedly connected between the first fireproof plate assembly 311 and the second fireproof plate assembly 313;
a movable connection assembly 33, including a first movable connection piece 331 fixed to the second tube 50 and abutted against a side of the first fireproof plate assembly 311 remote from the second fireproof plate assembly 313, and the first movable connection piece 331 having a first strip-shaped hole 3311; the movable connection assembly 33 further includes a first limiting column 334 which is convexly arranged on a surface of the first fireproof plate assembly 311 facing away from the second fireproof plate assembly 313 and passed through the first strip-shaped hole 3311; one end of the first fireproof plate assembly 311 remote from the second tube 50 is fixedly connected with the first tube 40; the movable connection assembly 33 further includes a second movable connection piece 333, one end of the second fireproof plate assembly 313 is fixedly connected with the first tube 40, and the other end of the second fireproof plate assembly 313 is movably connected with the second tube 50 through the second movable connection piece 333; and
a flexible fireproof belt 35 located between the first fireproof plate assembly 311 and the second fireproof plate assembly 313, and configured to connect the heat insulation piece 312 and the second tube 50.

In the technical scheme of the present disclosure, the waterproof tape assembly 10 is installed between adjacent first and second tubes 40 and 50 to prevent external moisture from entering the tubes. The first and second tubes 40 and 50 may be any two adjacent tubes. The fireproof assembly 30 is arranged on the inner side of the waterproof tape assembly 10, and can prevent the fire inside the tubes from affecting the waterproof tape assembly 10, thereby protecting the waterproof tape assembly 10. The fireproof assembly 30 is further arranged to include the first fireproof plate assembly 311, the heat insulation piece 312 and the second fireproof plate assembly 313. If a fire breaks out in the tubes, the fire can be blocked by the three-layer structure of the first fireproof plate assembly 311, the heat insulation piece 312 and the second fireproof plate assembly 313 gradually, so that the influence of the fire in the tubes on the waterproof tape assembly 10 is minimized. Tests show that the fireproof design described above can at least meet the four-hour fireproof requirement, that is, the fire in the tubes will not affect the waterproof tape assembly 10 within four hours, thus greatly improving the service life of the waterproof tape assembly 10.
One end of the first fireproof plate assembly 311 and one end of the second fireproof plate assembly 313 are both fixedly connected with the first tube 40, and the other ends of the first fireproof plate assembly 311 and the second fireproof plate assembly 313 are movably connected with the second tube 50 through the movable connection assembly 33. The movable connection assembly 33 includes a first movable connection 331 and a second movable connection 333, both of which have fireproof plate structures. Specifically, the first movable connection piece 331 is fixed to the second tube 50 and abutted against the side of the first fireproof plate assembly 311 away from the second fireproof plate assembly 313. The first movable connection piece 331 is provided with a first strip-shaped hole 3311. The surface of the first fireproof plate assembly 311 away from the second fireproof plate assembly 313 is convexly provided with a first limiting column 334 which is passed through the first strip-shaped hole 3311. The first limiting column 334 is configured to move relatively in the first strip-shaped hole 311, thereby changing the distance between the first tube 40 and the second tube 50 in the longitudinal direction. When the distance between the first tube 40 and the second tube 50 becomes larger in the longitudinal direction, the first tube 40 and the second tube 50 can still be blocked by the first movable connection piece 331, thus maintaining a good fireproof performance. The second fireproof plate assembly 313 is movably connected with the second tube 50 through the second movable connection piece 333, so that when the longitudinal distance between the first tube 40 and the second tube 50 becomes larger, the first tube 40 and the second tube 50 are further blocked by the second movable connection piece 333, thereby improving the fireproof performance of the tube joint.
It can be understood that the fixed connections between the first fireproof plate assembly 311 and the tube, and between the second fireproof plate assembly 313 and the tube can be achieved by bolts and fixed plates. The movable connections between the first fireproof plate assembly 311 and the tube, and between the second fireproof plate assembly 313 and the tube can be realized by providing a sliding slot at an end of the second tube 50, and ends of the first fireproof plate assembly 311 and the second fireproof plate assembly 313 are inserted into the sliding slot to slide. Of course, it can be understood that the first fireproof plate assembly 311 and the tube 50, and the second fireproof plate assembly 313 and the tube 50 can be connected in other ways, which are also within the scope of protection of the present disclosure.
When there is a longitudinal movement between the first tube 40 and the second tube 50 through the movable connection assembly 33, the flexible fireproof belt 35 can expand accordingly, thereby further preventing the temperature from being transmitted from portions of the first fireproof plate assembly 311 and the second fireproof plate assembly 313 where the heat insulation piece 312 is not provided, and further improving the fireproof capability of the fireproof assembly 30.
The flexible fireproof belt 35 is made of asbestos, and will be installed in a precompressed manner during installation, i.e. at the same height, the density of asbestos is increased. So that the flexible fireproof belt 35 can longitudinally expand during the longitudinal displacement of the first tube 40 and the second tube 50, to meet the requirements of longitudinal displacement. The flexible fireproof belt 35 can cooperate with the movable connection assembly 33 to better insulate heat and prevent fire after expanding.
Referring to Fig. 3, in one embodiment of the present disclosure, the movable connection assembly 33 further includes a stopper 332, which is abutted against the side of the first movable connection 331 facing away from the first fireproof plate assembly 311 and is fixedly connected to the first limiting column 334.
The stopper 332 has a fireproof plate structure, and the arrangement of the stopper 332 can not only improve the reliability of the joint between the first tube 40 and the second tube 50 in the moving process, but also further improve the fireproof capability of the first fireproof plate assembly 311.
In an embodiment of the present disclosure, the first fireproof plate assembly 311 is provided with a first connection hole, the stopper 332 is provided with a second connection hole, and the first limiting column 334 is passed through the first connection hole, the first strip-shaped hole 3311 and the second connection hole to fixedly connect the first fireproof plate assembly 311 and the stopper 332.
The first limiting column 334 may be a screw or a bolt. The first limiting column 334 is passed through the first connection hole, the first strip-shaped hole 3311 and the second connection hole, and is screwed to both ends of the limiting column by nuts. One nut is abutted against the side of the first fireproof plate assembly 311 facing away from the stopper 332, and the other nut is abutted against the side of the stopper 332 facing away from the first fireproof plate assembly 311, thereby fixing the stopper 332 and the first fireproof plate assembly 311. The first movable connection piece 331 is clamped between the first fireproof plate assembly 311 and the stopper 332. When there is a displacement between the first tube 40 and the second tube 50 in the longitudinal direction, the first movable connection piece 331 can move relative to the first fireproof plate assembly 311 and the stopper 332. The cooperation of the first limiting column 334 and the first strip-shaped hole 3311 can limit the range of relative movement of the first tube 40 and the second tube 50.
In one embodiment of the present disclosure, the first fireproof plate assembly 311 includes a fireproof plate 3111 and a fixed fireproof plate 3113, the fireproof plate 3111 is fixedly connected with the first tube 40, the fixed fireproof plate 3113 is positioned between the fireproof plate 3111 and the second tube 50, and the protection plate assembly 31 further includes a connection piece 36, the fireproof plate 3111, the fixed fireproof plate 3113, the heat insulation piece 312 and the second fireproof plate assembly 313 are fixedly connected with the connection piece 36; and
the first connection hole is formed in the fixed fireproof plate 3113.
The first fireproof plate assembly 311 is split into a structure in which the fireproof plate 3111 and the fixed fireproof plate 3113 are spliced, which is convenient for plate transportation and installation on the construction site.
The connection piece 36 may be a plurality of U-steel, a combination structure of U-steel and angle steel, or a connection structure formed of U-steel and other connection steels of various shapes. The connection piece 36 is mainly used for fixedly connecting the first fireproof plate assembly 311, the heat insulation piece 312 and the second fireproof plate assembly 313.
In the embodiment of the present disclosure, the range value of the thickness H1 of the first fireproof plate assembly 311 is: 28.5 mm ≤ h1 ≤ 36 mm.
The first fireproof plate assembly 311 has a preliminary fireproof function. Therefore, the thickness should not be too thin. If the thickness is too thin, it is difficult to prevent fire. The thickness is set to be no less than 28.5mm, the above-mentioned fireproof function can be realized. Of course, the thickness of the first fireproof plate assembly 311 should not be too thick, which will affect the overall assembly of the tube. Therefore, the thickness of the first fireproof plate assembly 311 is set to be no more than 36mm.
The thickness of the fireproof plate 3111 and the fixed fireproof plate 3113 both ranges from 28.5mm to 36mm.
In order to facilitate transportation and assembly at the construction site, the fireproof plate 3111 includes three layers of fireproof composite plates 3111 a stacked on one another, the three layers of fireproof composite plates 3111 a are all fixedly connected with the connection piece 36, the fixed fireproof plate 3113 includes three layers of fixed fireproof composite plates 3113a stacked on one another, the three layers of fixed fireproof composite plates 3113a are all fixedly connected with the connection piece 36, the first connection hole is penetrated through the three layers of fixed fireproof composite plates 3113a, and one fireproof composite plate 3111a is butted with one fixed fireproof composite plate 3113a. The three fireproof composite plates 3111a and the three fixed fireproof composite plates 3113a can be assembled by self-tapping screws and such like, which are all within the protection scope of the present disclosure.
Further, the thickness of each fireproof composite plate 3111a of the fireproof plate 3111 is h1, 9.5mm≤h1≤12mm, and the thickness of the fixed fireproof composite plate 3113a is consistent with the thickness of the fireproof composite plate 3111a.
In order to achieve a better fireproof effect, the following settings can be adopted: in the three fireproof composite plates 3111a, the thicknesses of the steel plates from bottom to top gradually decrease, and the overall thickness of the three fireproof composite plates 3111a still needs to meet the requirements of 28.5 mm ≤ h1 ≤ 36 mm. Because the thickness of the bottom steel plate is thick enough, when a large fire is generated, the bottom steel plate the first to resist the fire and will not deform due to the large fire.
The fireproof composite plate is a composite steel plate, the inner layer is a cement core layer mixed with fibers, and the outer side is a perforated galvanized steel plate with a thickness of 0.5mm.
Referring to Fig. 4, in an embodiment of the present disclosure, the second movable connection piece 333 is fixedly connected to the second tube 50 and abutted against the side of the second fireproof plate assembly 313 remote from the first fireproof plate assembly 311. The second movable connection piece 333 is provided with a second strip-shaped hole 3332. The movable connection assembly 33 further includes a second limiting column 335, which is convexly arranged on the side of the second fireproof plate assembly 313 remote from the first fireproof plate assembly 311 and passed through the second strip-shaped hole 3332. The end of the second limiting column 335 is abutted against the second movable connection piece 333 facing away from the second fireproof plate assembly
When there is a displacement between the first tube 40 and the second tube 50 in the longitudinal direction, the second limiting column 335 is configured to move in the second strip-shaped hole 3332 and to be stopped by the side wall of the second strip-shaped hole 3332, to limit the longitudinal movement range of the first tube 40 and the second tube 50. The cooperation of the second movable connection piece 333 and the first movable connection piece 331 makes the movement of the first tube 40 and the second tube 50 more stable during the displacement process.
With continued reference to Fig. 4, the second movable connection piece 333 further includes a hanger 3331 and a fireproof cover plate 3333, the hanger 3331 is fixedly connected with the second tube 50 and abutted against the side of the fireproof cover plate 3333 facing away from the second fireproof plate assembly 313, the second strip-shaped hole 3332 is penetrated through the hanger 3331 and the fireproof cover plate 3333, and the end of the second limiting column 335 is abutted against the side of the hanger 3331 facing away from the fireproof cover plate 3333.
The hanger 3331 is fixed to the second tube 50 to provide the connection bearing capacity. The fireproof cover 333 is located below the hanger 3331 and can provide fireproof for the hanger 3331 when the fire breaks out in the tubes.
Further, the hanger 3331 includes a first connection arm 3331a and a second connection arm 3331b forming an included angle with the first connection arm 3331a, the first connection arm 3331a is fixedly connected with the second tube 50, the second connection arm 3331b is fixedly connected with the fireproof cover plate 3333, and the second strip-shaped hole 3332 is penetrated through the second connection arm 3331b.
The first connection arm 3331a may be a steel square cylinder, and fixedly connected with the second tube 50 through an expansion screw. The second connection arm 3331b can be an inverted T-shaped steel member, and two second strip-shaped holes are penetrated through two lower wings of the T-shaped structure.
Further, the first connection arm 3331a and the second connection arm 3331b are perpendicular to each other. The installation requirement of the second fireproof plate assembly 313 and the second tube 50 is ensured.
In the embodiment of the present disclosure, a range of the thickness h2 of the second fireproof plate assembly 313 is 28.5 mm ≤ h2 ≤ 36 mm.
The second fireproof plate assembly 313 is located above the first fireproof plate assembly 311, and the second fireproof plate assembly 313 plays the role of final heat insulation. Therefore, the thickness of the second fireproof plate assembly 313 should not be too thin. If the thickness is too thin, it is difficult to achieve the purpose of temperature insulation. The above-mentioned purpose of temperature insulation can be achieved by setting the thickness to be no less than 28.5mm. Of course, the thickness of the second fireproof plate assembly 313 should not be too thick, which will affect the overall assembly of the tubes. Therefore, the thickness of the second fireproof plate assembly 313 is set to be no more than 36mm.
In order to facilitate transportation and assembly, the second fireproof plate assembly 313 includes three layers of fireproof composite plates which is stacked on one another and fixedly connected with each other, and the second limiting column 335 is convexly arranged on one fireproof composite plate adjacent to the second movable connection piece 333. The three fireproof composite plates are fixedly connected with the connection piece 36.
Further, the thickness of each fireproof composite plate of the second fireproof plate assembly 313 is h2, 9.5 mm ≤ h2 ≤ 12 mm.
If the second fireproof plate assembly 313 is provided as a whole plate, it is inconvenient in the process of transportation and assembly. Therefore, it is convenient to transport and assemble by using a fireproof composite plate arranged in layers. The thickness of each layer of fireproof composite plate shall meet the requirements of 9.5mm to 12mm, so that the overall thickness can meet the requirements of fireproof.
The three fireproof composite plates can be assembled by self-tapping screws and the like, all of which are within the protection scope of the present disclosure.
In one embodiment of the present disclosure, the heat insulation piece 312 is made of asbestos. Asbestos is also called "asbestos fiber" and defined as a general term for some silicate minerals that can be split into elastic fiber filaments. Chemical formula of the asbestos is: 3MgO·2SiO2·2H₂O, the Asbestos is fibrous, green yellow or white. The asbestos is white when split into flocs with a silky luster, and the fibers are elastic. The asbestos is acid, alkali and heat resistant, and is a poor conductor of heat and electricity. Therefore, the heat insulation piece 312 of the present disclosure is made of asbestos material, which can better insulate heat and prevent fire.
Further, a range of the thickness H3 of the heat insulation piece 312 is 120mm≤H3≤150mm.
Similarly, the thickness of the heat insulation piece 312 should not be too thin. If it is too thin, it is difficult to achieve the purpose of insulating temperature, the above-mentioned purpose of insulating temperature can be achieved by setting it to be no less than120mm. Of course, the thickness of the heat insulation piece 312 should not be too thick, which will affect the overall assembly of the tube 50. Therefore, the thickness of the heat insulation piece 312 is set to be no more than 150mm.
Referring to Figs. 1 and 2, in one embodiment of the present disclosure, the end of the heat insulation piece 312 facing away from the flexible fireproof belt 35 is provided with an auxiliary fire belt 34, one end of which is connected with the heat insulation piece 312 and the other end is connected with the first tube 40.
That is, when the heat insulation piece 312 is installed, both ends of the heat insulation piece 312 are not directly connected to the ends of the first tube 40 and the second tube 50. One end of the heat insulation piece 312 is connected to the second tube 50 through the flexible fireproof belt 35, and the other end is connected through the auxiliary fire belt 34, which acts similarly to the flexible fireproof belt 35 to block the heat transfer.
In one embodiment of the present disclosure, the adjacent end faces of the first tube 40 and the second tube 50 are respectively convexly provided with a first connecting section 41 and a second connecting section 51, the waterproof tape assembly 10 is connected to the first connecting section 41 and the second connecting section 51, the waterproof tape assembly 10, the first connecting section 41, the second connecting section 51, the end faces of the first tube 40 and the second tube 50, and the first fireproof plate assembly 311 are enclosed to form a fireproof space, and the second fireproof plate assembly 313 and the heat insulation piece 312 are positioned in the fireproof space.
The fireproof space thus arranged can not only facilitate the assembly of the fireproof assembly 30 and the waterproof tape assembly 10, but also make the overall structure compact.
Further, the heat insulation piece 312 is installed on the surface of the first fireproof plate assembly 311 facing the second fireproof plate assembly 313. When assembling the fireproof assembly 30, the first fireproof plate assembly 311 is assembled first, then the heat insulation piece 312 is assembled on the surface of the first fireproof plate assembly 311, then the flexible fireproof belt 35 is assembled, and finally the second fireproof plate assembly 313 is assembled to be completely assembled. The upper and lower surfaces of the heat insulation piece 312 may be abutted against the upper surface of the first fireproof plate assembly 311 and the lower surface of the second fireproof plate assembly 313, respectively. Of course, it is also possible to mount the heat insulation piece 312 only on the upper surface of the first fireproof plate assembly 311 similar to that shown in the drawings of this present disclosure.
The foregoing description merely depicts some embodiments of the present disclosure and therefore is not intended to limit the scope of the application. An equivalent structural or flow changes made by using the content of the specification and drawings of the present disclosure, or any direct or indirect applications of the disclosure on any other related fields shall all fall in the scope of the present disclosure.

Claims

A fireproof structure of a tube joint of an immersed tube tunnel with a linear moving mechanism, comprising a waterproof tape assembly and a fireproof assembly, the waterproof tape assembly and the fireproof assembly being connected between a first tube of the immersed tube tunnel and a second tube of the immersed tube tunnel adjacent to the first tube, the fireproof assembly being spaced from the waterproof tape assembly and positioned at an inner side of the waterproof tape assembly, and the fireproof assembly comprising:
a protection plate assembly, comprising a first fireproof plate assembly, a second fireproof plate assembly spaced from the first fireproof plate assembly, and a heat insulation piece fixedly connected between the first fireproof plate assembly and the second fireproof plate assembly;

a movable connection assembly, comprising a first movable connection piece fixed to the second tube and abutted against a side of the first fireproof plate assembly remote from the second fireproof plate assembly, and the first movable connection piece defining a first strip-shaped hole; the movable connection assembly further comprising a first limiting column convexly arranged on a surface of the first fireproof plate assembly facing away from the second fireproof plate assembly and passed through the first strip-shaped hole; one end of the first fireproof plate assembly remote from the second tube being fixedly connected with the first tube; the movable connection assembly further comprising a second movable connection piece, one end of the second fireproof plate assembly being fixedly connected with the first tube, and the other end of the second fireproof plate assembly being movably connected with the second tube through the second movable connection piece; and

a flexible fireproof belt positioned between the first fireproof plate assembly and the second fireproof plate assembly, and connecting the heat insulation piece and the second tube.
The fireproof structure of a tube joint of an immersed tube tunnel with a linear moving mechanism of claim 1, wherein the movable connection assembly further comprises a stopper abutted on a side of the first movable connection piece facing away from the first fireproof plate assembly and fixedly connected to the first limiting column.
The fireproof structure of a tube joint of an immersed tube tunnel with a linear moving mechanism of claim 2, wherein the first fireproof plate assembly comprises a first connection hole, the stopper defining a second connection hole, and the first limiting column being configured to pass through the first connection hole, the first strip-shaped hole and the second connection hole to fixedly connect the first fireproof plate assembly and the stopper.
The fireproof structure of a tube joint of an immersed tube tunnel with a linear moving mechanism of claim 3, wherein the first fireproof plate assembly comprises a first fireproof plate and a fixed fireproof plate, the first fireproof plate being fixedly connected with the first tube, the fixed fireproof plate being positioned between the first fireproof plate and the second tube, the protection plate assembly further comprises a connection piece, and the first fireproof plate, the fixed fireproof plate, the heat insulation piece and the second fireproof plate assembly being all fixedly connected with the connection piece; and
the first connection hole is defined on the fixed fireproof plate.
The fireproof structure of a tube joint of an immersed tube tunnel with a linear moving mechanism of claim 4, wherein the first fireproof plate comprises three layers of fireproof composite plates stacked on one another, the three layers of fireproof composite plates are fixedly connected with the connection piece, the fixed fireproof plate comprises three layers of fixed fireproof composite plates stacked on one another, the three layers of fixed fireproof composite plates are fixedly connected with the connection piece, the first connection hole is configured to penetrate through the three layers of fixed fireproof composite plates, and one of the fireproof composite plates is butted with one of the fixed fireproof composite plate.
The fireproof structure of a tube joint of an immersed tube tunnel with a linear moving mechanism of claim 5, wherein a thickness of each of the fireproof composite plates of the first fireproof plate is h1, 9.5mm≤h1≤12mm, and a thickness of the fixed fireproof composite plate is consistent with that of the fireproof composite plate.
The fireproof structure of a tube joint of an immersed tube tunnel with a linear moving mechanism of claim 1, wherein the second movable connection piece is fixedly connected with the second tube and abutted on a surface of the second fireproof plate assembly remote from the first fireproof plate assembly, the second movable connection piece defines a second strip-shaped hole, the movable connection assembly further comprises a second limiting column, the second limiting column is convexly arranged on the surface of the second fireproof plate assembly remote from the first fireproof plate assembly and passed through the second strip-shaped hole, and an end of the second limiting column is configured to be abutted against a surface of the movable connection assembly opposite to the second fireproof plate assembly.
The fireproof structure of a tube joint of an immersed tube tunnel with a linear moving mechanism of claim 2, wherein the second movable connection piece is fixedly connected with the second tube and abutted on a surface of the second fireproof plate assembly remote from the first fireproof plate assembly, the second movable connection piece defines a second strip-shaped hole, the movable connection assembly further comprises a second limiting column, the second limiting column is convexly arranged on the surface of the second fireproof plate assembly remote from the first fireproof plate assembly and passed through the second strip-shaped hole, and an end of the second limiting column is configured to be abutted against a surface of the movable connection assembly opposite to the second fireproof plate assembly.
The fireproof structure of a tube joint of an immersed tube tunnel with a linear moving mechanism of claim 3, wherein the second movable connection piece is fixedly connected with the second tube and abutted on a surface of the second fireproof plate assembly remote from the first fireproof plate assembly, the second movable connection piece defines a second strip-shaped hole, the movable connection assembly further comprises a second limiting column, the second limiting column is convexly arranged on the surface of the second fireproof plate assembly remote from the first fireproof plate assembly and passed through the second strip-shaped hole, and an end of the second limiting column is configured to be abutted against a surface of the movable connection assembly opposite to the second fireproof plate assembly.
The fireproof structure of a tube joint of an immersed tube tunnel with a linear moving mechanism of claim 4, wherein the second movable connection piece is fixedly connected with the second tube and abutted on a surface of the second fireproof plate assembly remote from the first fireproof plate assembly, the second movable connection piece defines a second strip-shaped hole, the movable connection assembly further comprises a second limiting column, the second limiting column is convexly arranged on the surface of the second fireproof plate assembly remote from the first fireproof plate assembly and passed through the second strip-shaped hole, and an end of the second limiting column is configured to be abutted against a surface of the movable connection assembly opposite to the second fireproof plate assembly.
The fireproof structure of a tube joint of an immersed tube tunnel with a linear moving mechanism of claim 7, wherein the second movable connection piece further comprises a hanger and a fireproof cover plate, the hanger is fixedly connected with the second tube and abuts against a side of the fireproof cover plate facing away from the second fireproof plate assembly, the second strip-shaped hole penetrates through the hanger and the fireproof cover plate, and the end of the second limiting column abuts against a side of the hanger facing away from the fireproof cover plate.
The fireproof structure of a tube joint of an immersed tube tunnel with a linear moving mechanism of claim 8, wherein the second movable connection piece further comprises a hanger and a fireproof cover plate, the hanger is configured to be fixedly connected with the second tube and abutted against a side of the fireproof cover plate facing away from the second fireproof plate assembly, the second strip-shaped hole is configured to be penetrated through the hanger and the fireproof cover plate, and the end of the second limiting column is configured to be abutted against a side of the hanger facing away from the fireproof cover plate.
The fireproof structure of a tube joint of an immersed tube tunnel with a linear moving mechanism of claim 9, wherein the second movable connection piece further comprises a hanger and a fireproof cover plate, the hanger is configured to be fixedly connected with the second tube and abutted against the side of the fireproof cover plate facing away from the second fireproof plate assembly, the second strip-shaped hole is configured to be penetrated through the hanger and the fireproof cover plate, and the end of the second limiting column is configured to be abutted against a side of the hanger facing away from the fireproof cover plate.
The fireproof structure of a tube joint of an immersed tube tunnel with a linear moving mechanism of claim 11, wherein the hanger comprises a first connection arm and a second connection arm forming an included angle with the first connection arm, the first connection arm is configured to be fixedly connected with the second tube, the second connection arm is configured to be fixedly connected with the fireproof cover plate, and the second strip-shaped hole is configured to be penetrated through the second connection arm.
The fireproof structure of a tube joint of an immersed tube tunnel with a linear moving mechanism of claim 7, wherein the second fireproof plate assembly comprises three layers of fireproof composite plates which are stacked on one another and fixedly connected, and the second limiting column is convexly arranged on one of the fireproof composite plates adjacent to the second movable connection piece.
The fireproof structure of a tube joint of an immersed tube tunnel with a linear moving mechanism of claim 8, wherein the second fireproof plate assembly comprises three layers of fireproof composite plates which are stacked on one another and fixedly connected, and the second limiting column is convexly arranged on one of the fireproof composite plates adjacent to the second movable connection piece.
The fireproof structure of a tube joint of an immersed tube tunnel with a linear moving mechanism of claim 15, wherein a thickness of each of the fireproof composite plates of the second fireproof plate assembly is h2, 9.5 mm ≤ h2 ≤ 12 mm.
The fireproof structure of a tube joint of an immersed tube tunnel with a linear moving mechanism of claim 1, wherein an end face of the first tube and an adjacent end surface of the second tube are respectively convexly provided with a first connecting section and a second connecting section, the waterproof tape assembly is configured to be connected to the first connecting section and the second connecting section, the waterproof tape assembly, the first connecting section, the second connecting section, the end face of the first tube, and the end face of the second tube, and the first fireproof plate assembly are enclosed to form a fireproof space, and the second fireproof plate assembly and the heat insulation piece are positioned in the fireproof space.
The fireproof structure of a tube joint of an immersed tube tunnel with a linear moving mechanism of claim 2, wherein an end face of the first tube and an adjacent end surface of the second tube are respectively convexly provided with a first connecting section and a second connecting section, the waterproof tape assembly is configured to be connected to the first connecting section and the second connecting section, the waterproof tape assembly, the first connecting section, the second connecting section, the end face of the first tube, and the end face of the second tube, and the first fireproof plate assembly are enclosed to form a fireproof space, and the second fireproof plate assembly and the heat insulation piece are positioned in the fireproof space.
The fireproof structure of a tube joint of an immersed tube tunnel with a linear moving mechanism of claim 3, wherein an end face of the first tube and an adjacent end surface of the second tube are respectively convexly provided with a first connecting section and a second connecting section, the waterproof tape assembly is configured to be connected to the first connecting section and the second connecting section, the waterproof tape assembly, the first connecting section, the second connecting section, the end face of the first tube, and the end face of the second tube, and the first fireproof plate assembly are enclosed to form a fireproof space, and the second fireproof plate assembly and the heat insulation piece are positioned in the fireproof space.