Construction method for locking point positions of single pre-buried channel duct pieces of spliced curve section

Abstract

The invention relates to the technical field of tunnel construction, in particular to a construction method for locking point positions of a single embedded channel segment of an assembled curved section. Comprising the following steps: S1, determining a segment splicing point position and a locking point position of a single pre-buried channel block segment at a set mileage position; s2, the center position of a first segment of a negative ring of a first ring of shield launching is controlled; s3, the posture of the shield is pre-deviated towards the interior of the line axis before the shield enters the line curve section; s4, the advance amount of each ring of duct piece of the curve section is measured in an auxiliary mode through horizontal laser, a shield advances according to a set point position, and a shield tail gap for locking the splicing point position is reserved; s5, the thrust oil cylinder assists in monitoring the rotation amount of each segment ring of the curve segment and correcting the rotation amount; and S6, a low-speed assembly pump is adopted for precisely and finely adjusting and positioning the segmented duct pieces, and a whole-ring duct piece is formed. And a set splicing point position of the duct piece local pre-buried channel is guaranteed, the utilization rate of the channel is met, and construction safety is guaranteed. The method is mainly applied to the aspect of assembling curve section single pre-buried channel duct pieces.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel construction, and more specifically, to a construction method for locking the positions of single-piece embedded channel segments in a curved section Background Art

[0002] In recent years, urban intercity railways have developed rapidly in China, and the application of large-diameter shield railway tunnels has been increasing day by day. Through the introduction, digestion, practice, and re-innovation of shield technology, the large-diameter shield construction technology and equipment in China have become core technologies. The application of the embedded channel technology for large-diameter shield segments has further promoted the high-quality development of large-diameter shields

[0003] Generally, the channels of urban subway segments are set by means of full-ring embedding. However, setting full-ring embedded channels for large-diameter railway tunnel segments will cause huge engineering waste, and generally, the method of full-ring embedding + partial embedded channels is adopted. Due to the influence of multiple factors such as the horizontal and vertical curves of the line, the shield attitude, and the characteristics of the segments, especially in the curved section, it is easier to cause a large deviation in the assembly positions of single-piece embedded channel segments. In the later stage, when installing the catenary, it needs to be installed by the method of implanting steel bars, resulting in problems such as low construction efficiency and damage to the segments caused by mechanical drilling. During the shield construction process, it is necessary to accurately control the locking of the positions of single-piece embedded channel segment blocks to ensure the 100% utilization rate of the embedded channels of the formed segments

[0004] In the prior art, there are curves in the tunnel. During the construction process, due to influencing factors such as shield attitude correction, segment rotation, and tail clearance, the positions of the segments of single-piece embedded channels often deviate at the established assembly positions Summary of the Invention

[0005] In order to overcome the deficiencies in the above prior art, the present invention provides a construction method for locking the positions of single-piece embedded channel segments in a curved section. This method can effectively ensure the established assembly positions of the partial embedded channels of the segments, meet the utilization rate of the channels, avoid the later post-embedded channels for the catenary, shorten the construction period, and ensure construction safety

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows A construction method for locking the positions of single-piece embedded channel segments in a curved section, comprising the following steps S1. According to the tunnel line and segment design drawings, layout the segments to determine the spliceable positions of the segments and the locking positions of the single-piece embedded channel segment blocks at the established mileage positions S2. Control the central position of the first segment of the first negative ring at the shield launch S3. Before the shield enters the curved section of the line, the attitude is pre-deviated towards the axis of the line S4. Use horizontal laser to assist in actually measuring the lead of each ring of segment in the curve section. The shield tunneling machine advances according to the established positions and reserves the tail shield clearance for locking and assembling positions. S5. Use vertical laser and propulsion cylinders with spirit levels to assist in monitoring the rotation amount of each ring of segment in the curve section and making corrections. S6. Use a low-speed assembling pump to precisely fine-tune and position the segmented segments to form a complete ring of segments.

[0007] In the step S1, when arranging the segments, according to the tunnel alignment, pre-arrange the segment assembling positions in advance, determine the distribution positions of the channels on the segments according to the positions, and strictly assemble according to the positions during the construction process.

[0008] In the step S2, according to the measurement and positioning, precisely assemble the first segment to ensure that the first ring of segments can play the role of a reference ring.

[0009] In the step S3, pre-deviate the attitude of the shield tunneling machine in advance, and the pre-deviation amount is to deviate 20 - 35 mm inward from the line axis.

[0010] In the step S4, during the construction of the curve section, the assembling positions of each ring of segments are consistent with the pre-arranged positions. Monitor the lead of each ring of segments ring by ring, and measure the tail shield clearance in a timely manner. Measure the tail shield clearance after each ring of propulsion and assembly.

[0011] In the step S5, a vertical laser device is set at the top of the tail shield to ensure the correct assembling positions of the segments. A spirit level is set on the propulsion cylinders to monitor the rotation of the shield tunneling machine and the segments at all times. In case of any abnormal situation, corrections need to be made in a timely manner.

[0012] In the step S6, the low-speed assembling pump uses stepless speed change to precisely control the fine-tuning of the segments to ensure the accurate positioning of each ring of segments and effectively ensure the correct positions of the channels.

[0013] Compared with the prior art, the beneficial effects of the present invention are: Through the pre-arrangement design of segment lining and the optimization of locking points, combined with the precise control technology of dynamic laser monitoring and low-speed assembly pump, ensure that the distribution position of embedded channels in the curved section strictly follows the design requirements. The positioning accuracy of the channels is significantly improved, which can directly meet the installation requirements of the catenary, avoid the secondary damage to the segment structure caused by the traditional post-implantation channel process, and ensure the integrity of the segment body. The shield attitude pre-deviation technology and multi-dimensional monitoring system are adopted to correct the lead and rotation deviation in the segment assembly process in real time, effectively inhibit the cumulative transmission of construction errors, ensure the continuity of the channels and the smoothness of the tunnel axis, and improve the stability of the overall construction quality. Based on the accurate positioning and real-time monitoring mechanism of the first ring reference, combined with the stepless speed change fine-tuning technology, the risk of stress concentration in the segment assembly process is significantly reduced, the potential hazards of concrete cracking and leakage are reduced, and the long-term safety of the tunnel structure is enhanced. The one-time accurate positioning technology of embedded channels greatly reduces the additional procedures in the later catenary construction. At the same time, through the closed-loop monitoring and dynamic control mechanism, the qualified rate of segment assembly is significantly improved, the rework rate is reduced, and the synergetic optimization of construction efficiency and cost control is realized. Brief Description of the Drawings

[0014] Figure 1 This is a schematic diagram of the construction process of the present invention. Detailed Embodiment

[0015] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0016] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0017] As Figure 1 shown, a construction method for locking points of a single-piece embedded channel segment in a curved section includes the following steps: S1. According to the tunnel line and segment design drawings, arrange the segments, determine the spliceable points of the segments and the locking points of the single-piece embedded channel segmented segments at the established mileage position; S2. Control the central position of the first segment of the first negative ring at the start of the shield tunneling; S3. Pre-deviate the shield attitude towards the inside of the tunnel axis before entering the curved section of the line S4. Use horizontal laser to assist in measuring the lead of each ring of segments in the curved section actually, and the shield tunneling advances according to the established points and reserves the tail shield clearance for the locking and splicing points; S5. Use vertical laser and propulsion cylinders with a spirit level bubble to assist in monitoring the rotation amount of each ring of segments in the curved section and correct it; S6. Use a low-speed assembly pump to precisely fine-tune and position the segmented lining segments to form a complete ring of lining segments.

[0018] Preferably, in step S1, when arranging the lining segments, according to the tunnel alignment, pre-arrange the assembly points of the lining segments in advance, and determine the distribution position of the channels on the lining segments according to the points. During the construction process, assemble strictly according to the points.

[0019] Preferably, in step S2, according to the measurement and positioning, precisely assemble the first lining segment to ensure that the first ring of lining segments can play the role of a reference ring.

[0020] Preferably, in step S3, pre-deviate the attitude of the shield machine in advance, and the pre-deviation amount is to deviate 20 - 35 mm inward from the line axis. In order to avoid inaccurate channel positions caused by changes in the assembly points of the lining segments due to construction errors, pre-deviate the attitude of the shield machine in advance.

[0021] Preferably, in step S4, during the construction of the curve section, the assembly points of each ring of lining segments are consistent with the pre-arranged points. Monitor the lead of the lining segments ring by ring, and measure the shield tail clearance in a timely manner. Measure the shield tail clearance after each ring of propulsion and assembly.

[0022] Preferably, in step S5, a vertical laser device is set at the top of the shield tail to ensure the correct assembly points of the lining segments. A spirit level is set on the propulsion cylinders to monitor the rotation of the shield machine and the lining segments at all times. In case of any abnormal situation, it is necessary to correct it in a timely manner.

[0023] Preferably, in step S6, the low-speed assembly pump uses stepless speed change to precisely fine-tune the lining segments, ensuring accurate positioning of each ring of lining segments and effectively ensuring the correct position of the channels.

[0024] Using this construction method can effectively ensure the established assembly points of the embedded channels of single lining segments of large-diameter shield machines in the curve section, meet the utilization rate of the channels, avoid post-implanted channels in the later catenary construction, protect the lining segment body, shorten the construction period, and ensure construction safety.

[0025] Only the preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the purpose of the present invention, and all such changes should be included within the protection scope of the present invention.

Claims

1. A construction method for locking points of a single-piece embedded channel segment in an assembled curved section, characterized in that It includes the following steps: S1. According to the tunnel line and segment design drawings, layout the segments, determine the segment erection points and the locking points of single-piece embedded channels in segments at the established mileage positions; S2. Control the central position of the first segment of the first negative ring at the shield starting point; S3. Pre-deviate the attitude of the shield machine towards the inside of the line axis before entering the curve section of the line; S4. Use horizontal laser to assist in measuring the lead of each ring of segments in the curve section. The shield advances according to the established points and reserves the tail gap for the locking and erection points; S5. Use vertical laser and propulsion cylinders with spirit levels to assist in monitoring the rotation of each ring of segments in the curve section and correcting it; S6. Use a low-speed erection pump to precisely fine-tune and position the segmented segments to form a complete ring of segments.

2. The construction method of locking points of a single-piece embedded channel segment for an assembled curved section according to claim 1, characterized in that: In step S1, when laying out the segments, according to the tunnel alignment, pre-arrange the segment erection points in advance, determine the distribution positions of the channels on the segments according to the points, and strictly erect the segments according to the points during the construction process.

3. The construction method of the locking point position of a single-piece embedded channel segment for assembling a curved section according to claim 1, characterized in that: In step S2, according to the measurement and positioning, precisely erect the first segment to ensure that the first ring of segments can serve as a reference ring.

4. The construction method for locking points of a single-piece embedded channel segment in an assembled curved section according to claim 1, characterized in that: In step S3, pre-deviate the attitude of the shield machine in advance, and the pre-deviation amount is 20 - 35 mm towards the inside of the line axis.

5. The construction method of locking points of a single-piece embedded channel segment for an assembled curved section according to claim 1, characterized in that: In step S4, during the construction of the curve section, the erection points of each ring of segments are consistent with the pre-arranged points. Monitor the lead of each ring of segments ring by ring, measure the tail gap in a timely manner, and measure the tail gap after each ring of propulsion and erection.

6. The construction method of locking points of a single-piece embedded channel segment for an assembled curved section according to claim 1, characterized in that: In step S5, a vertical laser device is set at the top of the shield tail to ensure the correct erection points of the segments. A spirit level is set on the propulsion cylinders to monitor the rotation of the shield machine and the segments at all times. In case of any abnormality, it is necessary to correct it in a timely manner.

7. The construction method of the locking point positions of the assembled single-piece embedded channel segment for the curved section according to claim 1, characterized in that: In step S6, the low-speed erection pump uses stepless speed control to precisely fine-tune the segments, ensuring the accurate positioning of each ring of segments and effectively ensuring the correct position of the channels.

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