Construction method for large-diameter shield small-clear-distance originating underneath pass of existing operation line

Abstract

The invention discloses a construction method for large-diameter shield small-clear-distance starting underneath passing of an existing operation line, and the method comprises the steps: arranging a plurality of monitoring points at a position, which is not less than 30 meters away from an outermost monitoring section, of a deformation region, and arranging a monitoring point installation point on an outer wall of an existing building; monitoring equipment is installed at the monitoring points in a side wall drilling mode, a Leica special small prism and a Leica total station are installed in a centering mode through standard expansion bolts, angle data of each monitoring point are monitored in real time, and the angle data correspond to a first mark number; whether the monitored angle data exceed a threshold value or not is judged, if yes, alarm information is sent to the terminal, and red photoelectric alarm is started at the position corresponding to the first mark number; grouting holes are formed in the pipe piece below the photoelectric alarm position, specific grout is injected into the outer wall of the pipe piece through the grouting holes, and the specific grout is grout prepared according to specific conditions and used for uniform grouting deep penetration.

Description

Technical Field

[0001] The present application relates to the technical field of shield construction, and in particular to a construction method for a large-diameter shield machine to start from a small clearance and pass under an existing operating line. Background Art

[0002] In urban construction and infrastructure development, it is often necessary to carry out deep foundation pit excavation, tunnel excavation and other work under complex geological conditions.

[0003] Shield construction in existing building areas often affects existing buildings. In the prior art, manual observation, measurement and calculation are generally used for such construction, which not only takes a long time but also has large errors, which is not conducive to the safe and efficient construction. Summary of the invention

[0004] The embodiments of this specification provide a construction method for a large-diameter shield machine with a small clearance to start underpassing an existing operating line, which is used to solve the problem of slow construction period in the prior art in the construction of a shield machine underpassing an existing operating line.

[0005] The technical solutions provided by the embodiments of this specification are: The present application provides a construction method for a large-diameter shield machine with a small clearance to start and pass under an existing operating line. The method includes: A monitoring point is set at least 30 meters away from the outermost monitoring section in the deformation zone. The monitoring point installation point is set on the outer wall of the existing building. Several monitoring points are set; The monitoring equipment is installed at the monitoring point by drilling holes in the side wall, and the Leica special small prism and Leica total station are installed in the center through standard expansion bolts. The angle data of each monitoring point is monitored in real time and corresponds to the first label; Determine whether the monitored angle data exceeds the threshold. If it exceeds the threshold, send an alarm message to the terminal and turn on the red photoelectric alarm at the corresponding first label; A grouting hole is opened in the pipe segment below the photoelectric alarm, and a specific slurry is injected into the outer wall of the pipe segment through the grouting hole. The specific slurry refers to a slurry configured according to specific circumstances and is used for uniform grouting and deep penetration.

[0006] Furthermore, the method also includes: Install several static levels on the top of the existing building load-bearing structure to monitor the settlement data of the load-bearing structure in real time and correspond to the second number; Determine whether the monitored settlement data exceeds the threshold. If so, send an alarm message to the terminal and turn on a yellow photoelectric alarm at the corresponding second label.

[0007] Furthermore, the threshold includes a first threshold and a second threshold. The first threshold means that if the data is at the first threshold, grouting construction is performed; the second threshold means that if the data is at the second threshold, emergency maintenance is performed on the existing building.

[0008] Furthermore, the specific slurry includes: if there are fewer gaps between particles on the outer wall of the pipe segment, a double liquid slurry of cement slurry and water glass is used.

[0009] Furthermore, the volume ratio of the cement slurry plus water glass double liquid slurry to the water glass is 1:1.

[0010] Further, the grouting method includes: The pressure is controlled at 0.2MPa~0.4MPa, and the slurry flow rate is 10~15L / min; The water glass double liquid grouting pressure is 0.3MPa~0.5MPa.

[0011] Furthermore, after the grouting is completed, the grouting slurry is solidified and observed to be leak-free, then the grouting ball valve is removed, the slurry in the grouting hole is cleaned, the hole is filled with filler and finally tightened with a sealing plug.

[0012] Furthermore, the filler is double-fast cement (micro-expansion) Furthermore, a sealing gasket is provided on the sealing plug.

[0013] At least one of the above-mentioned technical solutions adopted in the embodiments of the present application can achieve the following beneficial effects: without the need for manual calculation and monitoring, data differences can be discovered in a timely manner, and targeted and rapid response measures can be taken, thereby greatly improving construction efficiency and construction safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 This is a schematic diagram of the close-range cross-sectional relationship between a tunnel and an existing building in an existing working condition provided in an embodiment of this specification.

[0015] Figure 2 This is a schematic diagram of the overall process structure provided in the embodiments of this specification.

[0016] Figure 3 This is a schematic diagram of the cross-sectional arrangement structure of monitoring points provided in the embodiments of this specification.

[0017] Figure 4 This is a schematic diagram of the static leveling monitoring point arrangement structure provided in the embodiments of this specification. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0019] The technical solutions provided by various embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0020] Construction status: Figure 1 As shown in the figure, the top of the Shenzhen-Huizhou intercity tunnel is only 2.5m away from the floor of Longcheng Park Station. The shield tunneling process will disturb the soil under the station floor.

[0021] This specification provides a method for constructing a large-diameter shield machine with a small clearance to start and go under an existing operating line. Figure 2 As shown, the method includes: S1. Set a monitoring point at least 30 meters away from the outermost monitoring section in the deformation zone. The monitoring point installation point is set on the outer wall of the existing building. Set a number of monitoring points; In one possible implementation, see Figure 3 As shown, the burial of the benchmark point: the benchmark point should be arranged at a distance of not less than 30 meters from the outermost monitoring section outside the deformation zone. In the shield tunnel of Longcheng Park Station on Line 16, the Leica L-shaped prism a is fixed to the side wall of the tunnel by standard expansion bolts, and then the benchmark point is checked regularly. Specifically, the side wall of the platform slab and the side wall of the negative third floor of the station are drilled at a position higher than the track surface, and the Leica special small prism is fixed by standard expansion bolts.

[0022] S2. Install the monitoring equipment at the monitoring point by drilling holes in the side wall, align and install the Leica special small prism and the Leica total station through standard expansion bolts, monitor the angle data of each monitoring point in real time, and correspond to the first label; In a possible implementation, in order to make the errors of each point uniform and make it easier for the total station to automatically find the target, the total station bracket should be installed on the side wall of the platform plate. Use an electric drill to drill holes under the platform plate, use expansion screws to fix the total station's forced centering bracket, install the total station power supply box on the side, and lead the power supply to the power supply box along the side wall through cables and connect.

[0023] Specifically, the total station is used to collect observation data through automated monitoring, and the benchmark points and observation data are adjusted to obtain the plane and elevation data of the monitoring points. The horizontal and vertical displacement changes of the station side walls are obtained by calculating the difference between the data of the two adjacent monitoring points after adjustment. In the background processing system, the obtained data is compared with the threshold.

[0024] S3, determine whether the monitored angle data exceeds the threshold value, if it exceeds the threshold value, send an alarm message to the terminal, and turn on the red photoelectric alarm at the corresponding first label; In one possible implementation, if the acquired angle data exceeds the threshold, a prompt message is sent to the project leader, and a red photoelectric alarm is issued at the first number of the data anomaly, so as to provide timely reminders and prompts of the specific location of the problem data, facilitating the timely and rapid rework of personnel returning to work.

[0025] S4. A grouting hole is opened in the pipe segment below the photoelectric alarm, and a specific slurry is injected into the outer wall of the pipe segment through the grouting hole. The specific slurry refers to a slurry configured according to specific circumstances and is used for uniform grouting and deep penetration.

[0026] In a possible implementation, if there are few gaps between the particles wrapped on the outer wall of the segment, cement slurry + water glass double liquid slurry is selected, with a water-cement ratio of 1.0 to 1.3, and a volume ratio of slurry to water glass of 1:1. The ratio of water glass stock solution to water is 1:4. The setting time of the double liquid slurry is 8 to 12 seconds. The mix ratio can be determined on site through tests according to actual needs and is not limited here.

[0027] Grouting is mainly controlled by grouting pressure. Because there are few gaps behind the wall, a larger pressure is required to inject the slurry. The cement grouting pressure is controlled at 0.2MPa~0.4MPa, and the slurry flow rate is 10~15L / min, so that the slurry can seep more evenly along the outer wall of the segment without splitting the soil and forming a mass reinforcement area, which affects the grouting effect. The water glass double liquid grouting pressure is 0.3MPa~0.5MPa. In specific applications, the specific parts should also consider the thickness of the tunnel cover, the pressure of the groundwater and the strength of the segment for accurate setting; the grouting volume is determined by field tests; at the same time, monitoring in all aspects should also be strengthened to guide grouting. No specific restrictions are made here.

[0028] After grouting is completed, wait for the grouting slurry to solidify and observe no leakage, then remove the grouting ball valve, clean the slurry in the grouting hole, fill it tightly with filler, and finally tighten it with a sealing plug. The filler includes but is not limited to double-fast cement (micro-expansion). A sealing gasket is provided on the sealing plug.

[0029] In a preferred implementation, see Figure 4 As shown, the method also includes: Install several static levels b on the top of the existing building load-bearing structure to monitor the settlement data of the load-bearing structure in real time, and correspond to the second number; Determine whether the monitored settlement data exceeds the threshold. If so, send an alarm message to the terminal and turn on a yellow photoelectric alarm at the corresponding second label.

[0030] This embodiment can monitor in real time whether the settlement of the main body is within a safe range during the shield construction process, and make targeted prompts.

[0031] Further preferably, the threshold includes a first threshold and a second threshold, the first threshold means that if the data is at the first threshold, grouting construction is performed; the second threshold means that if the data is at the second threshold, emergency maintenance is performed on the existing building.

[0032] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0033] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A construction method for a large-diameter shield machine with a small clearance to start and go under an existing operating line, characterized in that: include: A monitoring point is set at least 30 meters away from the outermost monitoring section in the deformation zone. The monitoring point installation point is set on the outer wall of the existing building. Several monitoring points are set; The monitoring equipment is installed at the monitoring point by drilling holes in the side wall, and the Leica special small prism and Leica total station are installed in the center through standard expansion bolts. The angle data of each monitoring point is monitored in real time and corresponds to the first label; Determine whether the monitored angle data exceeds the threshold. If it exceeds the threshold, send an alarm message to the terminal and turn on the red photoelectric alarm at the corresponding first label; A grouting hole is opened in the pipe segment below the photoelectric alarm, and a specific slurry is injected into the outer wall of the pipe segment through the grouting hole. The specific slurry refers to a slurry configured according to specific circumstances and is used for uniform grouting and deep penetration.

2. The construction method of large-diameter shield tunneling with small clearance starting under an existing operating line according to claim 1, characterized in that: The method also includes: Install several static levels on the top of the existing building load-bearing structure to monitor the settlement data of the load-bearing structure in real time and correspond to the second number; Determine whether the monitored settlement data exceeds the threshold. If so, send an alarm message to the terminal and turn on a yellow photoelectric alarm at the corresponding second label.

3. The construction method of large-diameter shield tunneling with small clearance starting and passing under an existing operating line according to claim 1, characterized in that: The threshold includes a first threshold and a second threshold. The first threshold means that if the data is within the first threshold, grouting construction is performed; the second threshold means that if the data is within the second threshold, emergency maintenance is performed on the existing building.

4. The construction method of large-diameter shield tunneling with small clearance starting and passing under an existing operating line according to claim 1, characterized in that: The specific slurry includes: if there are fewer gaps between particles on the outer wall of the pipe segment, a double liquid slurry of cement slurry and water glass is used.

5. The construction method of large-diameter shield tunneling with small clearance starting and passing under an existing operating line according to claim 4 is characterized in that: The volume ratio of the cement slurry plus water glass double liquid slurry to the water glass is 1:

1.

6. The construction method of large-diameter shield tunneling with small clearance starting and passing under an existing operating line according to claim 4, characterized in that: Grouting methods include: The pressure is controlled at 0.2MPa~0.4MPa, and the slurry flow rate is 10~15L / min; The water glass double liquid grouting pressure is 0.3MPa~0.5MPa.

7. The construction method of large-diameter shield tunneling with small clearance starting and passing under an existing operating line according to claim 1, characterized in that: After the grouting is completed, wait for the grouting slurry to solidify and observe if there is any leakage, then remove the grouting ball valve, clean the slurry in the grouting hole, fill it tightly with filler, and finally tighten it with a sealing plug.

8. The construction method of large-diameter shield tunneling with small clearance starting to cross existing operating lines according to claim 7, characterized in that: The filler is double-fast cement.

9. The construction method of large-diameter shield tunneling with small clearance starting to cross existing operating lines according to claim 7, characterized in that: A sealing gasket is provided on the sealing plug.

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