A construction method for manual obstacle clearance during pipe jacking under existing waterways

Abstract

The present application relates to a construction method for manually removing obstacles during pipe jacking under an existing waterway, which includes: S1. Laying pipes along a preset jacking route; S2. Judging whether there are obstacles in the jacking route, obtaining the positions of the obstacles and planning a reverse obstacle removal route; S3. Drilling advanced exploration holes in reverse and judging whether there are obstacles in the reverse obstacle removal road; S4. Laying a concrete casing from the receiving well and jacking it in reverse to the position of the obstacle and sleeving it on the jacking pipe, and the concrete casings are sleeved through a connecting component; S5. Conducting reverse excavation in the concrete casing to the position of the obstacle; S6. Conducting manual obstacle removal treatment on the obstacle and removing the obstacle from the receiving well in reverse; S7. Continuing to lay pipes along the preset jacking route and guiding the machine head to the position of the receiving well; S8. Conducting grouting filling treatment on the gap between the concrete casing and the jacking pipe. The present application has the effects of reducing the cost of obstacle removal construction and improving the convenience of obstacle removal during pipe jacking under an existing waterway.

Description

Technical Field

[0001] The invention relates to the technical field of pipe jacking construction, and in particular to an artificial obstacle clearing construction method for a pipe jacking passing through an existing waterway. Background Art

[0002] At present, with the continuous development of urban construction, when constructing underground structures, it is inevitable that underpass construction will occur between underground buildings and existing buildings. Pipe jacking construction is a common construction method for construction in the soil area without digging up the pipeline. However, in the process of pipe jacking, it is inevitable to encounter large obstacles in the soil area, causing the machine head to get stuck, affecting the jacking work of the pipeline.

[0003] The existing method for clearing obstacles during the jacking process is usually to calculate the position of the obstacle, open a skylight on the ground, and crush the obstacle and then dig it out from the skylight on the ground, or to open the cabin of the machine head under the condition of stable excavation surface, and transport the building out from the laid pipeline. However, the above two obstacle removal methods need to be based on the premise that there are no existing buildings on the corresponding ground or the excavation surface environment is stable. For pipe jacking construction under existing waterways, there are no conditions for opening a skylight to clear obstacles, and the groundwater under the existing waterways is generally abundant, the excavation surface is unstable and prone to water seepage, and it is difficult to open the cabin of the machine head to clear obstacles. Especially when the obstacle is relatively close to the receiving well, the cost of opening a skylight or opening the cabin of the machine head to clear obstacles from the original jacking route is relatively high.

[0004] With respect to the above-mentioned related technologies, the inventors believe that there is a defect that the obstacle clearance work of the top pipe passing through the existing waterway is not convenient enough. Summary of the invention

[0005] In order to improve the convenience of clearing obstacles when a pipe is jacked down through an existing waterway, the present application provides a method for artificially clearing obstacles when a pipe is jacked down through an existing waterway.

[0006] This application provides a method for artificial obstacle removal construction of pipe jacking under an existing waterway, which adopts the following technical scheme:

[0007] S1. Lay the pipeline from the working well according to the preset jacking route;

[0008] S2, determine whether there are obstacles on the jacking route, obtain the location of the obstacle and plan a reverse obstacle removal route;

[0009] S3, drilling an advance exploration hole in the reverse direction from the receiving well, and determining whether there are obstacles on the reverse clearance road;

[0010] S4. According to the reverse obstacle removal route, lay a concrete casing pipe from the receiving well in a reverse jacking manner to the obstacle position, and sleeve it on the jacking pipe. Among them, the concrete casing pipes are sleeved through a connecting component;

[0011] S5. Carry out reverse excavation in the concrete casing pipe until the obstacle position;

[0012] S6. Carry out manual obstacle removal treatment on the obstacle, and reverse the obstacle to be removed from the receiving well;

[0013] S7. Continue to lay the pipe according to the preset jacking route, and guide the machine head to the receiving well position;

[0014] S8. Carry out grouting filling treatment on the gap between the concrete casing pipe and the jacking pipe.

[0015] By adopting the above technical solution, when the obstacle position is relatively close to the receiving well, since when the jacking pipe passes under the existing waterway, it is not convenient to carry out the operation of clearing obstacles by opening a skylight above the jacking pipe, and there is rich groundwater under the existing waterway, the excavation surface is unstable, and it is not convenient to carry out the operation of clearing obstacles by opening the cabin for the jacking machine head, and the construction cost is relatively high. Therefore, when laying the pipe according to the preset jacking route, by detecting the obstacle in advance, planning the reverse obstacle removal route according to the obstacle position, laying the concrete casing pipe for the reverse obstacle removal route, it is convenient for workers to enter the casing pipe for manual excavation and obstacle removal. By manually excavating the soil layer in reverse until the obstacle position, and manually removing the obstacle. After the obstacle is removed, continue to lay the pipe according to the preset jacking route, and guide the tunneling machine head to the receiving well position. Since there is a certain gap between the concrete casing pipe and the jacking casing pipe, groundwater is easy to penetrate, resulting in ground settlement or segment dislocation. Therefore, it is necessary to carry out grouting filling on the gap between the concrete casing pipe and the jacking casing pipe to reduce the impact of the jacking pipe construction on the ground. By reverse manual obstacle removal, the construction cost of obstacle removal when the jacking pipe passes under the existing waterway is reduced, and it is more convenient compared with the construction methods of opening a skylight or opening the cabin for obstacle removal.

[0016] Preferably, in step S2, when judging whether there is an obstacle in the jacking route, obtaining the obstacle position and planning the reverse obstacle removal route, it specifically includes:

[0017] S21. Carry out advanced exploration hole treatment on the next jacking position of the jacking route;

[0018] S22. According to the result of the advanced exploration hole, judge whether the soil quality condition of the next jacking position meets the requirement of continuous jacking;

[0019] S23. If so, carry out grouting reinforcement treatment on the next jacking position, and continue to jack and sleeve the next section of the casing pipe;

[0020] S24: If not, the obstacle position is calculated based on the distance already advanced, and a reverse obstacle clearance route is planned based on the remaining distance advanced.

[0021] By adopting the above technical scheme, the next jacking position of the jacking route is subjected to advance drilling processing to determine whether the soil quality of the next jacking position is suitable for continuing jacking, and the water flow of the next jacking position is detected by advance drilling to reduce the risk of water gushing and flooding of the jacking pipe. When an obstacle is detected, the position of the obstacle is calculated according to the jacking distance, and the reverse obstacle clearance route is planned according to the remaining jacking distance, so as to facilitate manual obstacle clearance according to the reverse obstacle clearance route and improve the obstacle clearance efficiency. In particular, when the obstacle is close to the receiving well, the construction cost required for reverse manual obstacle clearance is lower.

[0022] Preferably, in step S3, drilling an advance exploration hole in the reverse direction from the receiving well and determining whether there is an obstacle on the reverse clearance road specifically includes:

[0023] S31, according to the reverse obstacle clearing route, reverse advance drilling processing is performed from the receiving well to the obstacle position;

[0024] S32, judging whether the soil conditions at the next reverse jacking position meet the requirements for continued jacking according to the advance drilling results;

[0025] S33, if yes, perform grouting reinforcement on the next reverse jacking position, and mechanically jack the pipe into the next section of concrete casing;

[0026] S34. If not, manually dig the soil layer in the concrete casing in reverse until the obstacle is removed.

[0027] By adopting the above technical scheme, the receiving well close to the obstacle position is used as an obstacle clearance work well, and a reverse advance drilling is carried out from the receiving well according to the reverse obstacle clearance route, and it is judged whether the soil quality of the next reverse jacking position meets the requirements of continued jacking, so as to judge whether the obstacle position is reached according to the reverse advance drilling, and the soil layer is manually excavated in the concrete casing until the obstacle is cleared from the receiving well, so as to facilitate the continued laying of the jacking pipeline, and improve the convenience of jacking pipe laying by reverse excavation of obstacles.

[0028] Preferably, in step S4, the receiving component includes: a receiving groove arranged at the tail of the laid concrete casing, and a receiving protrusion arranged at the head of the concrete casing to be laid, and the receiving protrusion is inserted into the receiving groove by mechanical jacking to lay the concrete casing.

[0029] By adopting the above technical solution, during the laying process of multi-section jacked pipes, the jacks installed in the working shaft are used to insert and fit the receiving protrusions of the pipes to be laid with the receiving grooves of the laid pipes, thereby improving the connection stability between multi-section concrete sleeves, reducing the situation where groundwater seeps into the pipes due to sleeve misalignment or insufficient insertion, and improving the waterproof performance of the pipes.

[0030] It should be noted that the tail of the concrete sleeve refers to the end of the concrete pipe section used for socketing with the next concrete pipe section, and the head of the concrete sleeve refers to the end of the concrete pipe section used for socketing with the previous concrete pipe section.

[0031] Preferably, the receiving assembly further includes: a flexible gasket disposed between the receiving protrusion and the receiving groove, and the receiving protrusion is embedded in the flexible gasket through mechanical pipe jacking; a locking member is also disposed between the receiving groove and the receiving protrusion, and after the receiving groove is embedded in the flexible gasket, the receiving groove and the receiving protrusion are locked by the locking member.

[0032] By adopting the above technical solution, during the tunneling process of the tunneling head, gaps are likely to appear in the rigidly inserted concrete sleeves, causing groundwater to seep into the pipes and affecting the pipe laying effect. By setting a flexible gasket between the receiving protrusion and the receiving groove, the waterproof performance of the pipe jacking during the tunneling process is improved, and the locking member locks the receiving protrusion, the flexible gasket and the receiving groove simultaneously, improving the insertion stability between adjacent concrete sleeves.

[0033] Preferably, the locking member includes: a plurality of expansion bolts, corresponding threaded holes are respectively provided on the receiving groove and the receiving protrusion, and after the receiving protrusion is inserted into the receiving groove, the expansion bolts are inserted into the corresponding threaded holes to fixedly connect the receiving groove, the receiving protrusion and the flexible gasket.

[0034] By adopting the above technical solution, after the receiving protrusion is inserted into the receiving groove, the expansion bolts are inserted into the corresponding threaded holes of the receiving groove and the receiving protrusion. Under the action of the expansion bolts, the receiving groove, the receiving protrusion and the flexible gasket are fixedly connected, improving the receiving stability of the receiving groove and the receiving protrusion.

[0035] Preferably, in step S4, a water stop ring is installed at the socketing position between the jacking pipe and the concrete sleeve.

[0036] By adopting the above technical solution, when the jacking pipe and the concrete pipe are socketed with each other, a water stop ring for preventing groundwater and mud from flowing back into the pipes is installed at the socketing position, reducing the mud backflow phenomenon at the socketing position and improving the construction convenience of clearing obstacles in the jacking pipe.

[0037] Preferably, in step S6, manual obstacle removal is carried out on the obstacles, and the obstacles are removed from the receiving well in the reverse direction, which specifically includes: using a pneumatic pick driven by an air compressor manually to remove the obstacles.

[0038] By adopting the above technical solution, since there is abundant groundwater in the soil layer outside the concrete pipe, and the position of the obstacle is relatively close to the receiving well, it is costly to remove the obstacle by blasting, and it is easy to cause groundwater to penetrate into the concrete pipe. Therefore, in order to reduce the construction cost of pipe jacking obstacle removal, the soil layer is dug manually to reach the position of the obstacle, and a pneumatic pick driven by an air compressor is used manually to remove the obstacle, thereby reducing the construction cost of obstacle removal.

[0039] Preferably, in step S8, the grouting pressure at the grouting inlet for grouting filling is greater than the resultant force of the static water pressure and the earth pressure at the grouting inlet.

[0040] By adopting the above technical solution, when grouting filling is carried out between the concrete pipe and the jacking pipe, the grouting pressure at the grouting inlet for grouting filling should be greater than the resultant force of the static water pressure and the earth pressure at the grouting inlet, reducing the situation of ground heave or splitting of the pipe wall caused by excessive grouting pressure, thereby filling the gap between the concrete pipe and the jacking pipe and improving the filling fit degree between the concrete pipe and the jacking pipe.

[0041] In summary, the present application includes at least one of the following beneficial technical effects:

[0042] 1. When the position of the obstacle is close to the receiving well, a reverse concrete casing is laid by mechanical pipe jacking in the reverse direction, and manual excavation and obstacle removal treatment are carried out, so as to facilitate the tunneling machine to continue jacking according to the preset jacking route, and the gap between the concrete pipe and the jacking pipe is filled by grouting, completing the laying of the jacking pipe, improving the convenience of obstacle removal for pipe jacking under the existing waterway, and the construction cost of manual reverse excavation and obstacle removal is low, reducing the construction cost of obstacle removal for pipe jacking under the existing waterway;

[0043] 2. When jacking the next jacking pipe or laying the concrete pipe in the reverse direction, advance detection holes are used for advance detection, and it is judged whether there are obstacles or large water flows at the next jacking position, thereby reducing the situation of water gushing and flooding inside the pipe during the jacking process and improving the safety of pipe jacking construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 is the construction flow chart of a construction method for manual obstacle removal of pipe jacking under an existing waterway in the present application.

[0045] Figure 2 is the obstacle judgment diagram of the next jacking position of a construction method for manual obstacle removal of pipe jacking under an existing waterway in the present application.

[0046] Figure 3 It is a soil quality judgment diagram of the reverse advanced exploration hole in a construction method for manually removing obstacles during pipe jacking under an existing waterway in this application.

[0047] Figure 4 It is an assembly schematic diagram of the connecting component of the concrete pipe in this application.

[0048] Figure 5 It is an enlarged schematic diagram of the connection structure at point A of the connecting component of the concrete pipe in this application.

[0049] Explanation of reference numerals:

[0050] 1, working shaft; 2, receiving shaft; 3, jacking pipe; 4, tunneling machine; 5, concrete casing; 6, obstacle; 7, water stop ring; 8, connecting component; 81, connecting groove; 82, connecting protrusion; 83, flexible gasket; 84, locking piece; 841, expansion bolt. Specific embodiments

[0051] The following further elaborates on this application with reference to the accompanying drawings.

[0052] In one embodiment, as Figures 1 to 5 shown, this application discloses a construction method for manually removing obstacles during pipe jacking under an existing waterway, specifically including the following steps:

[0053] S1. Lay pipes from the working shaft 1 along the preset jacking route;

[0054] According to the set jacking route, install the base and support at the back in the working shaft 1. For example, lay sleepers on the well foundation and install two guide rails on the sleepers to limit the position of the pipe segments. The guide rails are laid along the axis of the preset jacking route and according to the center position at the jacking portal. Adjust the inner distance, center line, and elevation of the guide rails multiple times to ensure that the center and elevation of the jacked pipe section can meet the requirements of the preset jacking route and ensure the accurate axis position of the reinforced concrete pipe. When constructing the back support, install the back seat cushion on the back seat wall according to the construction drawings, and adjust the position of the back seat cushion so that the plane of the back seat gasket is perpendicular to the jacking direction of the pipe jacking. To prevent groundwater from flowing into the working pit when the tunneling machine 4 enters the hole, a water stop ring 7 can also be installed on the cavity wall in the jacking direction. Through the mutual cooperation of the tunneling machine 4 and the jacks, continuously jack in multiple pipe segments to lay the jacking pipe 3.

[0055] S2. Judge whether there is an obstacle 6 on the jacking route, obtain the position of the obstacle 6, and plan the reverse obstacle removal route;

[0056] Refer to Figure 2, when judging the obstacle 6 at the next jacking position of the jacking route, first perform advanced hole exploration on the next jacking position of the jacking route through step S21; specifically, perform advanced hole exploration on the perimeter and centroid of the determined next jacking position, where the depth of the perimeter hole exploration is maintained above 150 cm, and the depth of the central hole exploration is maintained above 200 cm. And before each excavation of the tunneling machine 4, perform grouting filling treatment to ensure that there is a grouting safety water-stop layer of more than one meter in the advancing direction of the jacked pipe section.

[0057] S22. According to the results of the advanced hole exploration, judge whether the soil condition at the next jacking position meets the requirements for continuous jacking.

[0058] According to the soil detection results of the advanced hole exploration, judge whether there is a situation of large and continuous water flow at the next jacking position, so as to judge whether there is abundant groundwater in the soil in front of the jacking route, and judge whether it meets the requirements for continuous jacking.

[0059] S23. If so, perform grouting reinforcement treatment on the next jacking position and continue to jack in and sleeve the next section of the casing.

[0060] If it meets the requirements, perform grouting reinforcement treatment on the next jacking position to keep a grouting safety water-stop layer of more than one meter continuously existing in front of the jacking route of the pipeline, and continue to sleeve the next section of the casing along the jacking route under the mutual cooperation of the tunneling machine 4 and the jacks of the backup support.

[0061] S24. If not, calculate the position of the obstacle 6 according to the jacked distance and plan the reverse obstacle clearing route according to the remaining jacking distance.

[0062] If it does not meet the requirements, calculate the position of the obstacle 6 according to the total construction path and the distance of the already jacked pipeline 3, and plan the reverse obstacle clearing route according to the remaining jacking distance of the obstacle 6 from the receiving well 2.

[0063] S3. Drill advanced holes backward from the receiving well 2 and judge whether there is an obstacle 6 on the reverse obstacle clearing road.

[0064] According to the reverse obstacle clearing route, use the receiving well 2 relatively close to the obstacle 6 as the obstacle clearing working well 1, install the base and support at the back in the receiving well 2, drill advanced holes backward according to the reverse obstacle clearing route, and judge whether there is an obstacle 6 on the reverse obstacle clearing road. Specifically, according to the backward drilled advanced holes, judge whether there is a situation of large and continuous water flow at the next jacking position of the reverse obstacle clearing road, that is, whether there is abundant groundwater in the soil at the next jacking position, so as to facilitate grouting reinforcement treatment according to the water flow situation at the next jacking position and reduce the influence of groundwater infiltration on the construction effect.

[0065] Specifically, refer to Figure 3First, according to step S31, according to the reverse obstacle clearing route, reverse advance drilling is performed from the receiving well 2 in the reverse direction toward the obstacle 6; specifically, advance drilling is performed from the surrounding and center positions of the top-up direction of the tunnel boring machine 4 head toward the next top-up position, wherein the depth of the surrounding drilling holes is maintained at more than 150 cm, and the depth of the center drilling hole is maintained at more than 200 cm, and before excavation, the excavation distance is limited to 50 cm each time, and the additional advance drilling distance is maintained at more than 50 cm, and a grouting safety water-stop layer of more than one meter is maintained before the excavation surface.

[0066] S32, judging whether the soil conditions at the next reverse jacking position meet the requirements for continued jacking according to the advance drilling results;

[0067] Based on the results of the advance drilling, it is judged whether the water flow at the next reverse jacking position is large and continuous, that is, whether there is abundant groundwater in the soil at the next reverse jacking position. Based on the judgment result, the next reverse jacking position is reinforced by grouting to reduce the impact of groundwater infiltration on the construction effect during the jacking process and improve the construction waterproof performance.

[0068] S33, if yes, then perform grouting reinforcement on the next reverse jacking position, and mechanically jack the pipe into the next section of concrete casing 5;

[0069] After the grouting reinforcement process is carried out on the next reverse jacking position, the next concrete casing 5 is jacked into the receiving well 2 by means of mechanical jacking, so that the next concrete casing 5 to be jacked can be connected with the previously laid pipe along the laid track, thereby deepening the laying of the reverse obstacle clearance route. By carrying out grouting reinforcement before jacking the concrete casing 5, the construction safety during manual obstacle clearance is improved.

[0070] S34, if not, then manually dig the soil layer in the concrete casing 5 in reverse until the obstacle 6 is removed.

[0071] If the soil conditions at the next reverse jacking position do not meet the requirements for continued jacking, it means that the concrete pipe has been laid to the position of the obstacle 6. In this case, the soil layer and obstacle 6 in the concrete casing 5 are removed by manual reverse excavation and transported out from the receiving well 2, thereby completing the reverse obstacle clearing work and facilitating the continued laying of the jacking pipe 3.

[0072] S4, according to the reverse obstacle clearing route, the concrete casing 5 is laid from the receiving well 2 and pushed in reverse to the position of the obstacle 6, and is sleeved on the jacking pipe 3, wherein the concrete casings 5 are sleeved by the receiving assembly 8;

[0073] Reference Figure 4, along the reverse obstacle clearing route, lay the concrete casing 5 from the receiving well 2 in the reverse direction towards the position of the obstacle 6, and lay multiple sections of the concrete casing 5 along the reverse obstacle clearing route by means of mechanical pipe jacking. When adjacent two sections of the concrete casing 5 are socketed, the receiving stability of the concrete casing 5 is improved through the mutual cooperation of the receiving components 8, the phenomenon of groundwater seepage is reduced, and when the concrete casing 5 is socketed onto the original jacking pipe 3, a water stop ring 7 is installed at the socketing position between the jacking pipe 3 and the concrete casing 5 to reduce the phenomenon of mud backflow at the socketing position, thereby ending the laying of the concrete pipe. The concrete casing 5 facilitates the construction personnel to manually clear the obstacle 6.

[0074] Specifically, referring to Figure 4 and Figure 5 , the receiving component 8 includes: a receiving groove 81 provided at the tail of the laid concrete casing 5, and a receiving protrusion 82 provided at the head of the concrete casing 5 to be laid. The receiving protrusion 82 is inserted into the receiving groove 81 by mechanical pipe jacking to lay the concrete casing 5, thereby improving the receiving stability of adjacent two sections of the concrete casing 5. Also, through the tightly received receiving groove 81 and receiving protrusion 82, the waterproof property between adjacent two sections of the concrete casing 5 is improved. To improve the waterproof performance between adjacent two sections of the concrete casing 5, a flexible gasket 83 is further provided at the connection between the receiving protrusion 82 and the receiving groove 81. The receiving protrusion 82 is embedded in the flexible gasket 83 by mechanical pipe jacking to squeeze the flexible gasket 83, reducing the gap between adjacent two sections of the concrete casing 5, thereby improving the waterproof property of the concrete casing 5; a locking member 84 is also provided between the receiving groove 81 and the receiving protrusion 82. After the receiving groove 81 is embedded in the flexible gasket 83, the receiving groove 81 and the receiving protrusion 82 are locked by the locking member 84, thereby improving the connection stability between adjacent two sections of the concrete casing 5.

[0075] The locking member 84 in this embodiment is set as a plurality of expansion bolts 841. Corresponding threaded holes are respectively provided on the receiving groove 81 and the receiving protrusion 82. After the receiving protrusion 82 is inserted into the receiving groove 81, the expansion bolts 841 are inserted into the corresponding threaded holes to fixedly connect the receiving groove 81, the receiving protrusion 82, and the flexible gasket 83. Through the threaded cooperation between the expansion bolts 841 and the threaded holes, the connection convenience between adjacent two sections of the concrete casing 5 is improved.

[0076] S5. By carrying out reverse excavation in the concrete casing 5 until reaching the position of the obstacle 6;

[0077] After the concrete pipes are laid, the construction workers enter the concrete casing 5 to manually dig the soil layer in the reverse direction until the position of the obstacle 6. Since the position of the obstacle 6 is relatively close to the receiving well 2, the manual digging method saves more construction costs.

[0078] S6. Conduct manual obstacle removal treatment on the obstacle 6 and remove the obstacle 6 from the receiving well 2 in the reverse direction;

[0079] After the construction workers reach the position of the obstacle 6, use an air compressor to drive a pneumatic pick to remove the obstacle 6 manually. During the obstacle removal process, keep the ventilation of the pipes in the concrete casing 5. Use the air compressor to drive the pneumatic pick to break the obstacle 6 and use a hydraulic shear to cut it again, so that the broken obstacle 6 is convenient to be transported out of the receiving well 2. By using an air compressor to drive a pneumatic pick manually for obstacle removal work, the construction cost of obstacle removal is reduced, and the large-sized broken pieces of the obstacle 6 are cut again, thus improving the convenience of obstacle 6 cleaning.

[0080] S7. Continue to lay the pipes according to the preset jacking route and guide the machine head to the position of the receiving well 2;

[0081] After the obstacle 6 is removed, continue to jack according to the preset jacking route and lay the jacking pipe 3. The tunneling machine 4 passes through the middle of the concrete casing 5 and is guided to the position of the receiving well 2. Remove the tunneling machine 4 from the jacking pipe 3 and lift it out of the receiving well 2 by a crane.

[0082] S8. Conduct grouting filling treatment on the gap between the concrete casing 5 and the jacking pipe 3;

[0083] After removing the tunneling machine 4, conduct grouting filling on the gap between the concrete pipe and the jacking pipe 3. And the grouting pressure at the grouting inlet is greater than the resultant force of the static water pressure and the soil pressure at the grouting inlet, reducing the situation of ground heaving of the pipe wall caused by excessive grouting pressure and reducing the adverse impact of pipe jacking construction on the ground. Stop grouting after the grouting pressure reaches the preset pressure threshold. Among them, the range value of the grouting pressure is 1.1 to 1.2 times the reasonable value of the static water pressure and the soil pressure.

[0084] A construction method for manual obstacle clearance of pipe jacking under an existing waterway in this embodiment, considering the actual situation that it is not convenient to open a skylight in the existing waterway, the groundwater is rich, and the construction cost of opening a cabin on the excavation surface for obstacle clearance is high. Also, considering that the position of the obstacle 6 is relatively close to the receiving well 2, by using the receiving well 2 as the obstacle clearance working well 1, laying a concrete obstacle clearance casing in the reverse direction, and removing the obstacle 6 by manually digging the soil layer in the reverse direction and driving a pneumatic pick by an air compressor, the construction cost of obstacle clearance for pipe jacking under the existing waterway is reduced, and the construction risks to the existing waterway and existing ground buildings caused by blasting for obstacle clearance are reduced. It has the advantage of reducing the construction cost for pipe jacking construction under the existing waterway.

[0085] The above are all the preferred embodiments of this application. The protection scope of this application is not limited hereby. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A construction method for manually removing obstacles during pipe jacking under an existing waterway, characterized in that, The construction method for manual obstacle removal of pipe jacking under an existing waterway includes: S1. Laying pipes from the working shaft (1) along a preset jacking route; S2. Judging whether there are obstacles (6) in the jacking route, obtaining the positions of the obstacles (6) and planning a reverse obstacle removal route; S3. Drilling advanced exploration holes in reverse from the receiving shaft (2) and judging whether there are obstacles (6) in the reverse obstacle removal path; S4. Laying a concrete casing (5) from the receiving shaft (2) in reverse along the reverse obstacle removal route and jacking it to the position of the obstacle (6), and sleeving it on the jacking pipe (3), wherein the concrete casings (5) are sleeved through a connecting component (8); S5. Conducting reverse excavation in the concrete casing (5) until the position of the obstacle (6) is reached; S6. Conducting manual obstacle removal treatment on the obstacle (6) and removing the obstacle (6) in reverse from the receiving shaft (2); S7. Continuing to lay pipes along the preset jacking route and guiding the machine head to the position of the receiving shaft (2); S8. Conducting grouting filling treatment on the gap between the concrete casing (5) and the jacking pipe (3); In the step S2, judging whether there are obstacles (6) in the jacking route, obtaining the positions of the obstacles (6) and planning a reverse obstacle removal route specifically includes: S21. Conducting advanced exploration hole treatment on the next jacking position of the jacking route; S22. Judging whether the soil condition of the next jacking position meets the requirement of continuous jacking according to the result of the advanced exploration hole; S23. If so, conducting grouting reinforcement treatment on the next jacking position and continuing to jack and sleeve the next section of the casing; S24. If not, calculating the position of the obstacle (6) according to the jacked distance and planning a reverse obstacle removal route according to the remaining jacking distance; In the step S3, drilling advanced exploration holes in reverse from the receiving shaft (2) and judging whether there are obstacles (6) in the reverse obstacle removal path specifically includes: S31. Conducting reverse advanced exploration hole treatment from the receiving shaft (2) in reverse to the position of the obstacle (6) according to the reverse obstacle removal route; S32. Judging whether the soil condition of the next reverse jacking position meets the requirement of continuous jacking according to the result of the advanced exploration hole; S33. If so, conducting grouting reinforcement treatment on the next reverse jacking position and conducting mechanical pipe jacking to sleeve the next section of the concrete casing (5); S34. If not, manually excavating the soil layer in the concrete casing (5) in reverse until the obstacle (6) is removed; In the step S4, the connecting component (8) includes: a connecting groove (81) arranged at the tail of the laid concrete casing (5), and a connecting protrusion (82) arranged at the head of the concrete casing (5) to be laid, and the connecting protrusion (82) is inserted into the connecting groove (81) through mechanical pipe jacking to lay the concrete casing (5).

2. The construction method for manually removing obstacles during pipe jacking under an existing watercourse according to claim 1, wherein, The receiving component (8) further includes: a flexible gasket (83) disposed between the receiving protrusion (82) and the receiving groove (81), and the receiving protrusion (82) is embedded in the flexible gasket (83) by mechanical pipe jacking; a locking member (84) is further disposed between the receiving groove (81) and the receiving protrusion (82), and after the receiving groove (81) is embedded in the flexible gasket (83), the receiving groove (81) and the receiving protrusion (82) are locked by the locking member (84).

3. The pipe jacking construction method for removing obstacles manually under the existing watercourse according to claim 2, characterized in that, The locking member (84) includes: a plurality of expansion bolts (841), corresponding threaded holes are respectively provided on the receiving groove (81) and the receiving protrusion (82), and after the receiving protrusion (82) is inserted into the receiving groove (81), the expansion bolts (841) are inserted into the corresponding threaded holes to fixedly connect the receiving groove (81), the receiving protrusion (82) and the flexible gasket (83).

4. The construction method for manual obstacle clearance of pipe jacking under existing waterways according to claim 1 is characterized in that, In step S4, a water stop ring (7) is installed at the position where the jacking pipe (3) and the concrete casing (5) are sleeved with each other.

5. The construction method for manually removing obstacles during pipe jacking under an existing waterway according to claim 1, characterized in that, In step S6, manual obstacle removal is performed on the obstacle (6), and the obstacle (6) is removed from the receiving well (2) in the reverse direction, specifically including: removing the obstacle (6) by manually driving a pneumatic pick with an air compressor.

6. The construction method for manual obstacle clearance of jacking pipe passing under existing waterways according to claim 1, wherein, In step S8, the grouting pressure at the grouting inlet for grouting filling is greater than the resultant force of the static water pressure and the soil pressure at the grouting inlet.

Images