A shield tunnel anti-floating segment and a mounting method thereof

Abstract

The application discloses a shield tunnel anti-floating segment and a mounting method thereof. The shield tunnel anti-floating segment comprises a reinforced concrete segment, a mounting groove is formed in the middle position of the top of the segment, an expansion component is mounted in the mounting groove, and a supporting steel plate is arranged on the top of the mounting groove. The expansion component comprises a bottom sleeve and an expansion column mounted in the sleeve. The sleeve is prefabricated and inlaid in the concrete base in the mounting groove. The top end of the expansion column is fixed with the inner side of the supporting steel plate. A cylindrical sealing air bag is arranged between the supporting steel plate and the mounting groove, and a sealing cavity is formed between the concrete base and the supporting steel plate. A grouting pipe is arranged in the segment. The top end of the grouting pipe penetrates through the segment and the concrete base, and is communicated with the sealing cavity. A sealing valve is arranged at the bottom of the grouting pipe. After the shield tunnel anti-floating segment is used, a stable support is formed between the segment and the rock-soil body outside the tunnel, and the anti-floating and positioning effects of the segment are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shield tunneling construction, in particular to a shield tunnel anti-floating segment and a mounting method thereof. BACKGROUND

[0002] With the large construction of urban metro and underground pipe gallery projects, the development of underground space is increasing. In order to reduce road traffic congestion and protect the environment, more and more underground projects are constructed by the shield method.

[0003] The shield method has the advantages of safety, high efficiency and environmental protection. However, in the actual construction process, in areas with abundant groundwater and high water pressure, the shield construction segment will be affected by the buoyancy during the construction process, which can easily cause the segment to float, misalign, and cause the tunnel bottom elevation deviation to exceed the standard and affect the tunnel use space. Severe floating can also cause shear failure of the shield tunnel segment, shield machine tilting, and uncontrollable shield posture, which seriously affects the construction quality and tunnel safety.

[0004] Therefore, how to solve the above technical problems is a technical problem that needs to be solved by those skilled in the art. SUMMARY

[0005] The present application provides a shield tunnel anti-floating segment and a mounting method thereof, which is used for positioning the shield construction tunnel segment to prevent the segment tunnel from floating under the action of buoyancy, and can effectively solve the problems of segment damage caused by the floating of the shield construction tunnel segment and the difficulty in controlling the shield posture caused by the floating of the tunnel segment.

[0006] To solve the above technical problems, the present application adopts the following technical solutions:

[0007] A shield tunnel anti-floating segment is designed, which comprises a reinforced concrete segment, an installation slot is formed in the middle top position of the segment, an expansion component is installed in the installation slot, a support steel plate is arranged at the top of the installation slot, and the shape and size of the support steel plate are matched with the opening at the top of the installation slot;

[0008] The expansion component comprises a bottom sleeve and an expansion column installed in the sleeve, the sleeve is precast and embedded in the concrete base inside the installation slot, and the top end of the expansion column is fixed with the inner side of the support steel plate;

[0009] A cylindrical sealing air bag is arranged between the support steel plate and the installation slot, the top of the sealing air bag is sealingly fixed with the inner side of the support steel plate, the bottom end of the sealing air bag is sealingly fixed with the edge of the concrete base inside the installation slot, and a sealed cavity is formed between the concrete base and the support steel plate;

[0010] The grouting pipe is arranged in the segment, the bottom end of the grouting pipe is located at the bottom of the segment, the top end penetrates through the segment and the concrete base and is communicated with the sealing cavity, and the sealing valve is arranged at the bottom of the grouting pipe.

[0011] Preferably, in the unused state, the sealing cavity is vacuumized through the grouting pipe, the vacuum pump is connected with the grouting pipe to vacuumize the sealing cavity, then the sealing valve at the bottom of the grouting pipe is closed, the sealing air bag is folded in the mounting groove, the telescopic column is located in the sleeve, and the top surface of the supporting steel plate is flush with the top surface of the segment.

[0012] The telescopic part can adopt a self-locking telescopic column, so that the telescopic column does not slide downward after being extended, and the self-locking structure can adopt that a limiting slot is arranged on the outer wall of the telescopic column in the transverse direction, a limiting column is arranged in the limiting slot, the bottom of the limiting column is provided with a spring, a limiting hole matched with the limiting column is arranged on the upper sidewall of the sleeve at the corresponding position, a part of the limiting column is folded in the limiting slot when the telescopic column is located in the sleeve, and the limiting column is extended and clamped in the limiting hole under the action of the spring after the telescopic column is extended, so that the telescopic column is prevented from sliding downward. A vertical sliding groove can also be arranged on the inner wall of the sleeve below the limiting hole, the outer end of the limiting column abuts against the sliding groove, and the limiting column moves along the sliding groove when the telescopic column moves upward, so that the limiting column can accurately enter the limiting hole.

[0013] Preferably, after the segment is assembled, the grouting pipe of the grouting device is connected with the grouting pipe, the sealing valve is opened, and the grouting pump is used to pressurize and grout, so that the concrete grout enters the sealing cavity through the grouting pipe, the sealing air bag is opened, the telescopic column is extended from the sleeve, and the supporting steel plate is pushed to support the rock-soil body outside the tunnel.

[0014] When the segment is installed, the shield machine moves forward, the supporting steel plate is completely separated from the shield tail, the grouting pipe is connected with the grouting pipe, the sealing valve is opened, the sealing cavity is filled with the rapid high-strength grouting concrete under the action of the vacuum negative pressure, the grouting pump is used to pressurize and grout, the sealing cavity is filled with the rapid high-strength grouting concrete, the supporting steel plate is pushed to support the rock-soil body outside the tunnel, and the segment is prevented from floating and positioned.

[0015] Preferably, the grouting groove is arranged at the bottom of the segment, and the bottom end of the grouting pipe and the sealing valve are located in the grouting groove.

[0016] Preferably, the sealing air bag is made of foldable pressure-resistant rubber material.

[0017] Preferably, the telescopic parts are four, respectively located at the four corners in the installation slot.

[0018] Preferably, the top edge and the bottom edge of the sealing air bag are sealed and fixed inside the support steel plate by the steel pressing strip.

[0019] Preferably, the width of the support steel plate is 1 / 3 of the width of the segment ring, and the length of the support steel plate is 1 / 3 of the arc length of the segment, and the thickness of the support steel plate is about 5 cm.

[0020] The present application also relates to a method for installing anti-floating segments of a shield tunnel, comprising the following steps:

[0021] S1: When the shield machine excavates to a distance of 1 segment ring, first assemble ordinary reinforced concrete segments at the lower part of the tunnel, and assemble 1 anti-floating segment at each of the 2 o'clock, 10 o'clock, and 12 o'clock positions of the tunnel cross section;

[0022] S2: After the first segment ring is assembled, the shield machine continues to excavate forward, and as the shield machine advances, the length of the segment that has been extruded out of the shield tail is calculated according to the extension length of the oil cylinder;

[0023] S3: After the 2 / 3 of the width of the positioned segment ring has been extruded out of the shield tail of the shield machine, i.e., the support plate is completely exposed from the shield tail, the grouting pipe of the grouting equipment is connected to the sealing valve joint of the anti-floating segment in the 12 o'clock, 10 o'clock, and 2 o'clock directions in turn;

[0024] S4: The sealing valves of the anti-floating segments in the 12 o'clock, 10 o'clock, and 2 o'clock directions are opened in turn, and under the action of the vacuum negative pressure in the sealing air bag, the quick-setting high-strength grouting concrete is sucked in, and at the same time, the grouting pump is used for pressurized grouting, so that the quick-setting high-strength grouting concrete filled in the sealing air bag is coagulated with the telescopic column and the support steel plate into an integral whole, which is jointly supported on the wall of the excavated tunnel rock-soil body to resist the buoyancy of the grouting outside the segment and the underground water on the segment tunnel, and prevent the segment tunnel from floating up.

[0025] The beneficial effect of the present application is that the shield tunnel anti-floating segment in the present application is used for shield tunnel segment positioning to prevent segment floating. By opening an installation groove at the top of the segment, setting a support steel plate and a sealed air bag, the support steel plate is buckled at the upper opening of the installation groove and is flush with the top surface of the segment when not in use, without affecting the normal installation of the segment. By setting the sealed air bag, the sealed cavity can be vacuumed, and after the segment is installed, the sealed valve is opened, so that the grouting concrete quickly enters the sealed cavity under the action of vacuum negative pressure. By setting the telescopic column, the support steel plate can be positioned to avoid deviation when the support steel plate is pushed out by the grouting concrete. The shield tunnel anti-floating segment can form a stable support between the top of the segment and the tunnel outer rock-soil body, play a role in segment anti-floating and segment positioning. The problems of segment damage caused by tunnel segment floating during shield construction and difficulty in controlling the shield posture due to tunnel segment floating can be effectively solved. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structure schematic diagram of the shield tunnel anti-floating segment of the present application when not in use;

[0027] Figure 2 is a state schematic diagram of the support steel plate of the shield tunnel anti-floating segment of the present application after extension;

[0028] Figure 3 is a use state diagram of the shield tunnel anti-floating segment of the present application;

[0029] Figure 4 is a self-locking structure schematic diagram of the telescopic part.

[0030] In the figure, 1 is a reinforced concrete segment, 2 is a support steel plate, 3 is a sealed air bag, 4 is a telescopic column, 5 is a segment concave-convex tenon, 6 is a segment sealing groove, 7 is a segment connecting bolt hole, 8 is a grouting pipe, 9 is a sealing valve, 10 is a grouting groove, 11 is a concrete base, 12 is a sleeve, 13 is a limiting column, 14 is a spring, 15 is a limiting hole. A is an anti-floating segment, B is a common reinforced concrete segment, C is a tunnel segment wall back mortar filling layer, D is a segment tunnel outer rock-soil body. DETAILED DESCRIPTION

[0031] The specific embodiments of the present application will be described below in conjunction with examples, but the following examples are only used to illustrate the present application in detail, and do not limit the scope of the present application in any way. The equipment elements involved in the following examples are conventional equipment elements unless otherwise specified.

[0032] Example 1: A shield tunnel anti-floating segment, as shown in Figures 1-3The pipe segment 1 is provided with a mounting groove in the middle of the top of the pipe segment, a telescopic component is mounted in the mounting groove, and a supporting steel plate 2 is arranged on the top of the mounting groove.

[0033] The telescopic component comprises a bottom sleeve 12 and a telescopic column 4 mounted in the sleeve 12, the sleeve 12 is pre-embedded in a concrete base 11 in the mounting groove, and the top end of the telescopic column 4 is fixed to the inner side of the supporting steel plate 2.

[0034] A cylindrical sealing air bag 3 is arranged between the supporting steel plate 2 and the mounting groove, the top of the sealing air bag 3 is sealingly fixed to the inner side of the supporting steel plate 2, the bottom end of the sealing air bag 3 is sealingly fixed to the edge of the concrete base 11 in the mounting groove, and a sealing cavity is formed between the concrete base 11 and the supporting steel plate 2.

[0035] A grouting pipe 8 is arranged in the pipe segment, the bottom end of the grouting pipe 8 is located at the bottom of the pipe segment, the top end of the grouting pipe 8 penetrates through the pipe segment and the concrete base 11 and is communicated with the sealing cavity, and a vacuum sealing valve 9 is arranged at the bottom of the grouting pipe 8.

[0036] In the unused state, the sealing cavity is vacuumized through the grouting pipe 8, the sealing valve 9 at the bottom of the grouting pipe 8 is closed, the sealing air bag 3 is folded in the mounting groove, the telescopic column 4 is located in the sleeve 12, and the top surface of the supporting steel plate 2 is flush with the top surface of the pipe segment.

[0037] After the pipe segments are assembled, the grouting pipe of the grouting equipment is connected to the grouting pipe 8, the sealing valve 9 is opened, the grouting pump is used for pressurized grouting, the concrete slurry enters the sealing cavity through the grouting pipe 8, the sealing air bag 3 is opened, the telescopic column 4 is extended from the sleeve, and the supporting steel plate 2 is pushed to support on the rock-soil body outside the tunnel.

[0038] A grouting groove 10 is arranged at the bottom of the pipe segment, and the bottom end of the grouting pipe 8 and the sealing valve 9 are located in the grouting groove 10. The sealing air bag 3 is made of foldable pressure-resistant rubber material. In the embodiment, the telescopic component 4 is four, which are respectively located at the four corners in the mounting groove. The top edge and the bottom edge of the sealing air bag 3 are sealingly fixed to the inner side wall of the supporting steel plate 2 and the inner edge of the mounting groove by steel pressing strips. A recessed part for accommodating the folded sealing air bag 3 is arranged at the edge of the concrete base 11, and the bottom of the sealing air bag 3 is mounted in the recessed part. The top of the supporting steel plate 2 is arc-shaped and matched with the top arc surface of the pipe segment, so that when it is retracted in the mounting groove, the outer surface thereof is matched with the top arc surface of the pipe segment. The width of the supporting steel plate is 1 / 3 of the ring width of the pipe segment, the length is 1 / 3 of the arc length of the pipe segment, the thickness of the supporting steel plate is about 5 cm, and the grouting pipe 8 is not less than DN32.

[0039] Embodiment 2: A shield tunnel anti-floating segment, based on Embodiment 1, further, the telescopic part is provided as a self-locking telescopic column, and a self-locking structure is adopted, that is, a transverse limiting slot is formed on the outer wall of the telescopic column 4, a limiting column 13 is arranged in the limiting slot, the bottom of the limiting column 13 is provided with a spring 14, a limiting hole 15 matched with the limiting column is formed on the upper side wall of the sleeve pipe at a corresponding position, when the telescopic column 4 is located in the sleeve pipe 12, a part of the limiting column 13 is retracted in the limiting slot, after the telescopic column 4 is extended, the limiting column 13 is extended under the action of the spring 14 and is clamped in the limiting hole 15, thereby avoiding the telescopic column 4 from sliding downward, see Figure 4 A vertical sliding groove can also be arranged on the inner wall of the sleeve pipe at a position below the limiting hole, the outer end of the limiting column abuts against the sliding groove, when the telescopic column moves upward, the limiting column moves along the sliding groove, so that the limiting column can accurately enter the limiting hole.

[0040] Embodiment 3: A shield tunnel anti-floating segment installation method, as shown in Figure 4 , the anti-floating segment A and the ordinary reinforced concrete segment B are assembled at corresponding positions of the shield tunnel, for preventing the segment tunnel from floating upward and positioning the segment tunnel. The method specifically comprises the following steps:

[0041] S1: When the shield machine excavates to a distance of 1 ring segment, the ordinary reinforced concrete segment is assembled at the lower part of the tunnel first, and one anti-floating segment is assembled at each of the 2 o'clock, 10 o'clock and 12 o'clock positions of the tunnel section;

[0042] S2: After the assembly of the first ring segment is completed, the shield machine continues to excavate forward, and the length of the segment out of the shield tail is calculated according to the extension length of the oil cylinder as the shield machine advances;

[0043] S3: After the 2 / 3 of the width of the positioned segment ring is out of the shield tail of the shield machine, that is, the support plate is completely exposed from the shield tail brush, the grouting pipes of the grouting equipment are connected to the sealing valve joints of the anti-floating segments in the 12 o'clock, 10 o'clock and 2 o'clock directions in sequence;

[0044] S4: The sealing valves of the anti-floating segments in the 12 o'clock, 10 o'clock and 2 o'clock directions are opened in sequence, under the action of the vacuum negative pressure in the sealing air bag, the quick-setting high-strength grouting concrete is sucked in, and at the same time, the grouting pump is used for pressurized grouting, the filled quick-setting high-strength grouting concrete in the sealing air bag is coagulated with the telescopic column and the support steel plate into an integral whole, which is supported on the wall of the excavated tunnel rock-soil body to resist the buoyancy of the segment tunnel caused by the grouting outside the segment and the underground water, thereby preventing the segment tunnel from floating upward.

[0045] The application is described in detail above in combination with the embodiments, but those skilled in the art can understand that, under the premise of not departing from the purpose of the application, each specific parameter in the above embodiments can be changed to form multiple specific embodiments, which are all within the common variation range of the application, and will not be described one by one here.

Claims

1. A method of installing a shield tunnel anti-floating segment, characterized by, It comprises the following steps: S1: when the shield machine is excavated to 1 ring segment distance, first assemble ordinary reinforced concrete segments at the lower part of the tunnel, and assemble 1 piece of anti-floating segment at the 2 o'clock, 10 o'clock and 12 o'clock positions of the tunnel section; S2: after the first ring segment is assembled, the shield machine continues to excavate forward, and the length of the segment out of the shield tail is calculated according to the length of the cylinder extension; S3: after the 2 / 3 of the width of the positioning segment ring is out of the shield tail, the grouting pipe of the grouting equipment is connected to the sealing valve joint of the anti-floating segment in the 12 o'clock, 10 o'clock and 2 o'clock directions in turn; S4: open the sealing valves of the anti-floating segments in the 12 o'clock, 10 o'clock and 2 o'clock directions in turn, under the action of the vacuum negative pressure in the sealing air bag, the high-strength rapid-setting grouting concrete is sucked in, and at the same time, the grouting pump is used for pressurized grouting, the high-strength rapid-setting grouting concrete filled in the sealing air bag is coagulated with the telescopic column and the support steel plate to form an integral whole, which is supported on the outer rock soil body of the tunnel to resist the buoyancy of the grouting outside the segment and the underground water to the segment tunnel, and prevent the segment tunnel from floating up; The shield tunnel anti-floating segment comprises a reinforced concrete segment, an installation groove is formed in the middle position of the top of the segment, a telescopic component is installed in the installation groove, a support steel plate is arranged at the top of the installation groove, and the shape and size of the support steel plate are matched with the opening at the top of the installation groove; the telescopic component comprises a bottom sleeve and a telescopic column installed in the sleeve, the sleeve is precastly embedded in the concrete base in the installation groove, and the top end of the telescopic column is fixed with the inner side of the support steel plate; A cylindrical sealing air bag is arranged between the support steel plate and the installation groove, the top of the sealing air bag is sealingly fixed with the inner side of the support steel plate, the bottom end of the sealing air bag is sealingly fixed with the edge of the concrete base in the installation groove, and a sealing cavity is formed between the concrete base and the support steel plate; A grouting pipe is arranged in the segment, the bottom end of the grouting pipe is located at the bottom of the segment, the top end of the grouting pipe penetrates through the segment and the concrete base, and is in communication with the sealing cavity; a sealing valve is arranged at the bottom of the grouting pipe.

2. The method of installing a shield tunnel anti-floating segment according to claim 1, characterized in that, In the unused state, the sealing cavity is vacuumed through the grouting pipe, the sealing valve at the bottom of the grouting pipe is closed, the sealing air bag is folded in the installation groove, the telescopic column is located in the sleeve, and the top surface of the support steel plate is flush with the top surface of the segment.

3. The method of installing a shield tunnel anti-floating segment according to claim 1, characterized in that, After the segment is assembled, the grouting pipe of the grouting equipment is connected to the corresponding grouting pipe, the sealing valve is opened, the grouting pump is used for pressurized grouting, the concrete slurry enters the sealing cavity through the grouting pipe, the sealing air bag is opened, the telescopic column is extended out of the sleeve, and the support steel plate is pushed to support on the outer rock soil body of the tunnel.

4. The method of installing a shield tunnel anti-floating segment according to claim 1, characterized in that, A grouting groove is formed at the bottom of the segment, and the bottom end of the grouting pipe and the sealing valve are located in the grouting groove.

5. The method of installing a shield tunnel anti-floating segment according to claim 1, wherein, The sealing air bag is made of foldable pressure-resistant rubber material.

6. The method of installing a shield tunnel anti-floating segment according to claim 1, wherein, The telescopic component is four, which are respectively located at the four corners in the installation groove.

7. The method of installing a shield tunnel anti-floating segment according to claim 1, wherein, The top edge and the bottom edge of the sealing air bag are sealingly fixed with the inner side wall of the support steel plate and the inner edge of the installation groove by the steel pressing strip.

8. The method of installing a shield tunnel anti-floating segment according to claim 1, wherein, The width of the support steel plate is 1 / 3 of the width of the segment ring, and the length is 1 / 3 of the arc length of the segment.

Images