Construction method for breaking and removing existing duct pieces in underground excavation transverse channel

Abstract

The invention relates to the technical field of construction methods, in particular to a construction method for breaking and removing an existing duct piece in an underground excavation transverse channel, which comprises the following steps of: 1, cleaning and reinforcing a surface layer of the duct piece; 2, a three-transverse cutting method is adopted; 3, a four-longitudinal cutting method is adopted; 4, breaking construction is conducted; 5, transporting the concrete blocks; a traditional dense cutting method is replaced with a three-transverse-four-longitudinal-method, the construction efficiency, the construction cost and the like are greatly improved, the problems that a traditional breaking method is large in work amount and long in construction period can be solved, half of the work amount and the construction period can be saved through the three-transverse-four-longitudinal-method, meanwhile, the problem that the manual cost and the mechanical cost are high in the traditional breaking method can be solved, and the construction period is shortened. The cost of the three-transverse four-longitudinal method is only half, the construction cost is greatly reduced, by adopting the construction method, the exposure time of the excavation face of the transverse channel is shortened, the safety risk in the construction process is reduced, and the high construction efficiency is achieved on the premise that the safety quality is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of construction methods, and in particular to a construction method for breaking existing pipe segments in a dark-excavated transverse channel. Background Art

[0002] In recent years, urban subways have developed rapidly. Breaking the existing pipe segments in dark-cut cross passages is one of the common processes in subway construction. Usually, when the dark-cut tunnel is excavated to the section of the existing pipe segment, a water drill is used to cut every 0.5m as the excavation progresses until the pipe segment is completely broken.

[0003] The main disadvantages of traditional breaking methods are:

[0004] (1) The amount of segment cutting work is too large, which seriously affects the construction period;

[0005] (2) High labor and machinery costs.

[0006] Therefore, in view of the problem that the above-mentioned construction method requires too much construction work for cutting the pipe segments, which seriously affects the construction period, and at the same time has high labor and machinery costs, and is time-consuming and labor-intensive, a construction method that can efficiently break the existing pipe segments in the dark excavation cross channel can be designed, which can solve the problems of large construction work, long construction period, and high labor and machinery costs of traditional breaking methods. Summary of the invention

[0007] In order to overcome the problems of large workload, long construction period, high labor and machinery costs for pipe segment cutting construction using the current traditional demolition methods.

[0008] The technical solution of the present invention is: a construction method for breaking existing pipe segments in a dark excavated transverse channel, and the steps are as follows:

[0009] Step 1: Cleaning and reinforcement of pipe surface

[0010] When the cross channel is excavated to the existing segment section, use a forklift and vacuum cleaner to remove debris and loose layers on the segment surface, and then clean the soil layer around the segment to remove loose soil and gravel that may affect the excavation stability and segment structure safety. At the same time, clean the working surface to provide space for construction workers to operate, and then reinforce the excavation surface to ensure the stability of the channel, thereby providing a safer working surface;

[0011] Step 2: Three-horizontal cutting method

[0012] First, cut at the segment crown position along the excavation direction of the transverse channel to form the first transverse cut, then cut at the segment spandrel position to form the second transverse cut, and finally cut at the segment waist position to form the third transverse cut;

[0013] Step 3: Four-vertical cutting method

[0014] Cut along the left contour line of the segment along the excavation direction of the transverse channel to form the first longitudinal incision, then cut in the middle core part of the segment to form the second longitudinal incision, and finally cut on the right contour line of the segment to form the third longitudinal incision;

[0015] Step 4: Demolition construction

[0016] The segment removal construction is carried out in four stages along the excavation direction of the transverse channel in the order of front to back and then from top to bottom;

[0017] Step 5: Transportation of concrete blocks

[0018] Use cranes, loaders, forklifts and other handling equipment to move the six larger concrete blocks that have been broken down and split out of the cross passage, and use cranes or loaders as transportation equipment to move the concrete blocks out of the cross passage.

[0019] Preferably, the construction machinery used in the construction process of all the above steps is equipped with external protective devices, and each machine must have one machine and one switch and a leakage protection switch.

[0020] Preferably, in step one, the soil around the pipe segment can be grout-reinforced by a grouting machine, an air compressor and a mixer to form a stable excavation surface, thereby providing safety protection for subsequent construction operations.

[0021] Preferably, in step 2 and step 3, the construction workers can use a water drill or a wire saw as a cutting device to cut the pipe segments.

[0022] Preferably, in steps 2 and 3, regular inspections are carried out on the on-site lines and facilities during the segment cutting process. Temporary distribution lines must be installed in accordance with specifications. Overhead lines must use insulated conductors. Plastic soft wires must not be used. They must not be laid overhead in bundles, nor laid openly on the ground.

[0023] Preferably, after the cutting is completed in step 4, a hydraulic breaker or a pneumatic pick can be used to break the cut concrete blocks.

[0024] Preferably, in step 4, a vacuum cleaner or an air compressor can be used to clean the dust and debris generated during the demolition process to keep the work surface clean and tidy.

[0025] Preferably, during the construction process of steps 2 to 4, crack monitoring equipment can be used to monitor the position, direction, length, width and depth of cracks on the surface of the structure, which can accurately measure the changes in the cracks and promptly discover the expansion and deterioration trends of the cracks. Laser displacement sensors can be used to monitor the tiny displacement changes on the surface of the structure in real time. Pore water pressure gauges can be used to monitor the pore water pressure in the soil to understand the seepage and consolidation state of the soil. At the same time, cameras can be installed at the construction site to observe the construction situation in real time through a remote monitoring system, and potential problems can be discovered and dealt with in a timely manner.

[0026] Beneficial effects of the present invention:

[0027] 1. The present invention uses the "three horizontal and four vertical" method to replace the traditional intensive cutting method, which greatly improves the construction efficiency and construction cost, and can solve the problems of large engineering workload and long construction period of the traditional demolition method. The "three horizontal and four vertical" method can save half of the workload and construction period, and can also solve the problem of high labor and machinery costs of the traditional demolition method. The "three horizontal and four vertical" method only costs half, which greatly reduces the construction cost;

[0028] 2. The present invention, through the adoption of the above-mentioned construction method, completes the project that would have taken 15 days in the original scheme in just 7 days. At the same time, because the cutting amount of the pipe segments in the "three horizontal and four vertical" method is half of that of the original scheme, a large amount of labor and machinery costs are saved, and the exposure time of the excavation surface of the horizontal channel is reduced, reducing the safety risks in the construction process. Under the premise of ensuring safety and quality, a higher construction efficiency is achieved, providing experience accumulation for similar engineering construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 What is shown is a flow chart of a construction method for breaking existing pipe segments in a dark excavated horizontal channel of the present invention;

[0030] Figure 2 Shown is a schematic diagram of the segments in step 4 of a construction method for breaking existing segments in a dark excavation transverse passage of the present invention;

[0031] Figure 3 Shown is a schematic diagram of cleaning and reinforcing the working surface in step 1 of a construction method for breaking existing pipe segments in a dark excavation transverse channel of the present invention;

[0032] Figure 4 Shown is a schematic diagram of pipe segment cutting construction of a construction method for breaking existing pipe segments in a dark excavated horizontal channel of the present invention;

[0033] Figure 5 Shown is a schematic diagram of the "three horizontal and four vertical" cutting method in step two and step three of a construction method for breaking existing pipe segments in a dark excavated horizontal channel of the present invention. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0035] See also Figure 1 The present invention provides an embodiment: a construction method for breaking existing pipe segments in a dark excavation transverse channel, the steps of which are as follows:

[0036] Step 1: Cleaning and reinforcement of pipe surface

[0037] When the cross channel is excavated to the existing segment section, use a forklift and vacuum cleaner to remove debris and loose layers on the segment surface, and then clean the soil layer around the segment to remove loose soil and gravel that may affect the excavation stability and segment structure safety. At the same time, clean the working surface to provide space for construction workers to operate, and then reinforce the excavation surface to ensure the stability of the channel, thereby providing a safer working surface;

[0038] Step 2: Three-horizontal cutting method

[0039] First, cut at the segment crown position along the excavation direction of the transverse channel to form the first transverse cut, then cut at the segment spandrel position to form the second transverse cut, and finally cut at the segment waist position to form the third transverse cut;

[0040] Step 3: Four-vertical cutting method

[0041] Cut along the left contour line of the segment along the excavation direction of the transverse channel to form the first longitudinal incision, then cut in the middle core part of the segment to form the second longitudinal incision, and finally cut on the right contour line of the segment to form the third longitudinal incision;

[0042] Step 4: Demolition construction

[0043] The segment removal construction is carried out in four stages along the excavation direction of the transverse channel in the order of front to back and then from top to bottom;

[0044] Step 5: Transportation of concrete blocks

[0045] Use cranes, loaders, forklifts and other handling equipment to move the six larger concrete blocks that have been broken down and split out of the cross passage, and use cranes or loaders as transportation equipment to move the concrete blocks out of the cross passage.

[0046] Example 1

[0047] When using the process of this technical solution, the steps are as follows:

[0048] Step 1: Cleaning and reinforcement of pipe surface

[0049] When the cross channel is excavated to the existing segment section, use a forklift and vacuum cleaner to remove debris and loose layers on the segment surface, and then clean the soil layer around the segment to remove loose soil and gravel that may affect the excavation stability and the safety of the segment structure. At the same time, clean the working surface to provide space for construction personnel to operate. Then reinforce the excavation surface to ensure the stability of the channel and provide a safer working surface. Grouting machines, air compressors and mixers can be used to grout and reinforce the soil around the segment to form a stable excavation surface, providing safety for subsequent construction operations.

[0050] Step 2: Three-horizontal cutting method

[0051] First, cut at the segment crown position along the excavation direction of the transverse channel to form the first transverse cut, then cut at the segment spandrel position to form the second transverse cut, and finally cut at the segment waist position to form the third transverse cut;

[0052] Step 3: Four-vertical cutting method

[0053] Cut along the excavation direction of the transverse channel on the left contour line of the segment to form the first longitudinal incision, then cut in the middle core part of the segment to form the second longitudinal incision, and finally cut on the right contour line of the segment to form the third longitudinal incision. Construction workers can use water drills as cutting equipment to cut the segments. During the segment cutting process, regular inspections of on-site lines and facilities are carried out. Temporary power distribution lines must be erected according to specifications. Overhead lines must use insulated conductors, and plastic soft wires must not be used. They must not be laid overhead in bundles, nor laid openly along the ground.

[0054] Step 4: Demolition construction

[0055] The segment breaking construction is carried out in four steps along the excavation direction of the cross channel in the order from front to back and then from top to bottom. After the cutting is completed, the cut concrete blocks can be broken with a hydraulic breaker. The dust and debris generated during the breaking process can be cleaned with a vacuum cleaner or air compressor to keep the working surface clean and tidy. During the construction process, crack monitoring equipment can be used to monitor the position, direction, length, width and depth of cracks on the surface of the structure. It can accurately measure the changes in the cracks and promptly discover the expansion and deterioration trends of the cracks. Laser displacement sensors can be used to monitor the tiny displacement changes on the surface of the structure in real time. Pore water pressure gauges can be used to monitor the pore water pressure in the soil to understand the seepage and consolidation state of the soil. At the same time, cameras can be installed on the construction site to observe the construction situation in real time through the remote monitoring system, and potential problems can be discovered and dealt with in a timely manner.

[0056] Step 5: Transportation of concrete blocks

[0057] Use cranes, loaders, forklifts and other handling equipment to transport the 6 larger concrete blocks that have been broken down and split out of the cross passage, and use cranes or loaders as transportation equipment to transport the concrete blocks out of the cross passage. The construction machinery used in the construction process of all the above steps is equipped with external protective devices, and each machine must have one machine, one switch and a leakage protection switch.

[0058] Example 2

[0059] When using the process of this technical solution, the steps are as follows:

[0060] Step 1: Cleaning and reinforcement of pipe surface

[0061] When the cross channel is excavated to the existing segment section, use a forklift and vacuum cleaner to remove debris and loose layers on the segment surface, and then clean the soil layer around the segment to remove loose soil and gravel that may affect the excavation stability and the safety of the segment structure. At the same time, clean the working surface to provide space for construction personnel to operate. Then reinforce the excavation surface to ensure the stability of the channel and provide a safer working surface. Grouting machines, air compressors and mixers can be used to grout and reinforce the soil around the segment to form a stable excavation surface, providing safety for subsequent construction operations.

[0062] Step 2: Three-horizontal cutting method

[0063] First, cut at the segment crown position along the excavation direction of the transverse channel to form the first transverse cut, then cut at the segment spandrel position to form the second transverse cut, and finally cut at the segment waist position to form the third transverse cut;

[0064] Step 3: Four-vertical cutting method

[0065] Cut along the excavation direction of the transverse channel on the left contour line of the segment to form the first longitudinal incision, then cut in the middle core part of the segment to form the second longitudinal incision, and finally cut on the right contour line of the segment to form the third longitudinal incision. Construction workers can use a rope saw as a cutting device to cut the segment. During the segment cutting process, regular inspections of the on-site lines and facilities are carried out. Temporary power distribution lines must be erected according to specifications. Overhead lines must use insulated conductors, and plastic soft wires must not be used. They must not be laid overhead in bundles, nor laid openly along the ground.

[0066] Step 4: Demolition construction

[0067] The segment breaking construction is carried out in four steps along the excavation direction of the cross channel in the order from front to back and then from top to bottom. After the cutting is completed, the cut concrete blocks can be broken with a pneumatic pick, and the dust and debris generated during the breaking process can be cleaned with a vacuum cleaner or air compressor to keep the working surface clean and tidy. During the construction process, crack monitoring equipment can be used to monitor the position, direction, length, width and depth of cracks on the surface of the structure. It can accurately measure the changes in the cracks and promptly discover the expansion and deterioration trends of the cracks. Laser displacement sensors can be used to monitor the tiny displacement changes on the surface of the structure in real time. Pore water pressure gauges can be used to monitor the pore water pressure in the soil to understand the seepage and consolidation state of the soil. At the same time, cameras can be installed at the construction site to observe the construction situation in real time through the remote monitoring system, and to promptly discover and deal with potential problems;

[0068] Step 5: Transportation of concrete blocks

[0069] Use cranes, loaders, forklifts and other handling equipment to transport the 6 larger concrete blocks that have been broken down and split out of the cross passage, and use cranes or loaders as transportation equipment to transport the concrete blocks out of the cross passage. The construction machinery used in the construction process of all the above steps is equipped with external protective devices, and each machine must have one machine, one switch and a leakage protection switch.

[0070] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the spirit of the present invention.

Claims

1. A construction method for breaking existing pipe segments in a dark excavated horizontal channel, characterized in that: The steps are as follows: Step 1: Cleaning and reinforcement of pipe surface When the cross channel is excavated to the existing segment section, use a forklift and vacuum cleaner to remove debris and loose layers on the segment surface, and then clean the soil layer around the segment to remove loose soil and gravel that may affect the excavation stability and segment structure safety. At the same time, clean the working surface to provide space for construction workers to operate, and then reinforce the excavation surface to ensure the stability of the channel, thereby providing a safer working surface; Step 2: "Three horizontal" cutting method First, cut at the segment crown position along the excavation direction of the transverse channel to form the first transverse cut, then cut at the segment spandrel position to form the second transverse cut, and finally cut at the segment waist position to form the third transverse cut; Step 3: "Four vertical" cutting method Cut along the left contour line of the segment along the excavation direction of the transverse channel to form the first longitudinal incision, then cut in the middle core part of the segment to form the second longitudinal incision, and finally cut on the right contour line of the segment to form the third longitudinal incision; Step 4: Demolition construction The segment removal construction is carried out in four stages along the excavation direction of the transverse channel in the order of front to back and then from top to bottom; Step 5: Transportation of concrete blocks Use cranes, loaders, forklifts and other handling equipment to move the six larger concrete blocks that have been broken down and split out of the cross passage, and use cranes or loaders as transportation equipment to move the concrete blocks out of the cross passage.

2. The construction method for breaking existing pipe segments in a dark excavated transverse channel according to claim 1 is characterized in that: The construction machinery used in the construction process of all the above steps is equipped with external protective devices. Each machine must have one machine, one switch and a leakage protection switch.

3. The construction method for breaking existing pipe segments in a dark excavated transverse channel according to claim 1 is characterized in that: In step one, the soil around the pipe segment can be reinforced by grouting using a grouting machine, an air compressor and a mixer to form a stable excavation surface, providing safety protection for subsequent construction operations.

4. The construction method for breaking existing pipe segments in a dark excavated transverse channel according to claim 1 is characterized in that: In step 2 and step 3, the construction workers can use a water drill or a wire saw as a cutting device to cut the pipe segments.

5. The construction method for breaking existing pipe segments in a dark excavated transverse channel according to claim 1 is characterized in that: In steps 2 and 3, regular inspections should be carried out on the on-site lines and facilities during the segment cutting process. Temporary distribution lines must be installed in accordance with specifications, overhead lines must use insulated conductors, and plastic soft wires must not be used. They must not be laid overhead in bundles, nor laid openly on the ground.

6. The construction method for breaking existing pipe segments in a dark excavated transverse channel according to claim 1 is characterized in that: After the cutting is completed in step 4, a hydraulic breaker or a pneumatic pick can be used to break the cut concrete blocks.

7. The construction method for breaking existing pipe segments in a dark excavated transverse channel according to claim 1 is characterized in that: In step 4, you can use a vacuum cleaner or air compressor to clean up the dust and debris generated during the demolition process to keep the work surface clean and tidy.

8. The construction method for breaking existing pipe segments in a dark excavated transverse channel according to claim 1 is characterized in that: During the construction process of steps 2 to 4, crack monitoring equipment can be used to monitor the position, direction, length, width and depth of cracks on the surface of the structure. It can accurately measure the changes in the cracks and promptly discover the expansion and deterioration trends of the cracks. Laser displacement sensors can be used to monitor the tiny displacement changes on the surface of the structure in real time. Pore water pressure gauges can be used to monitor the pore water pressure in the soil to understand the seepage and consolidation state of the soil. At the same time, cameras can be installed at the construction site to observe the construction situation in real time through the remote monitoring system, and potential problems can be discovered and dealt with in a timely manner.

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