A rotary pipe jacking construction method

Abstract

A rotary pipe jacking construction method, the construction mechanism includes a rotary pipe jacking device, a spiral concrete pipe, and a socket pipe. The rotary pipe jacking device is divided into a hydraulic pushing part and a rotary part. The hydraulic pushing part is backed against a back wall, and the front hydraulic push rod is pushed against the back of the rotary part. The spiral concrete pipe is installed in the front rotary jacking pipe of the rotary part of the rotary pipe jacking device. The two spiral concrete pipes are connected by a socket pipe. A connecting hole is left at the connection of the socket pipe and is connected together by bolts. Then, cement slurry is injected to fill and seal and tighten. The beneficial effects of the present invention are: high construction efficiency, simple equipment, small footprint, small workload for construction personnel, reduced labor intensity, low site requirements, flexible and convenient construction, small groundbreaking surface, small amount of earth and stone discharge, small workload for correction and rectification, and improved construction progress.

Description

Technical Field

[0001] The invention relates to the technical field of rainwater pipe laying, and in particular to a rotary pipe jacking construction method. Background Art

[0002] Municipal rainwater pipelines are usually laid by manual jacking and earth pressure balance jacking. In the reserved jacking pit, the rainwater pipeline adopts a 120° concrete foundation and hydraulic equipment is used to push the concrete pipe into the soil layer.

[0003] The traditional hydraulic jacking device of the artificial rainwater pipeline laying mechanism has low working efficiency and huge workload. Although the traditional earth pressure balance jacking mechanism has improved efficiency, the equipment is complex, the groundbreaking surface is large, and the correction workload is large, which affects the construction efficiency. Summary of the Invention

[0004] The present invention provides a rotary pipe jacking construction method. In order to solve the technical difficulties in the construction process of rainwater pipelines, the present invention adopts a rotary pipe jacking device, which cooperates with a concrete pipe with a rotary external thread to rotate into the soil layer, and lays the concrete pipe to the position of the rainwater pipeline through a hydraulic jack. The rotary pipe jacking device is highly practical, the hydraulic pressure is greatly reduced, the equipment is light, the efficiency is high, the ground-breaking surface is small, and the correction workload is small.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A rotary pipe jacking construction method, the rotary pipe jacking construction mechanism includes a lifting device, an earthwork transport box, a grouting machine, and a back wall. The lifting device lifts the earthwork transport box out of the foundation pit through a steel wire rope. The earthwork transport box is loaded with earth discharged during the pipe jacking process. The grouting machine presses water or cement slurry from the grouting pipe to the outer wall of the pipe. The back wall is located at the rear of the entire mechanism. The rotary pipe jacking construction mechanism also includes a rotary pipe jacking device, a spiral concrete pipe, and a socket pipe. The rotary pipe jacking device is divided into a hydraulic pushing part and a rotating part. The hydraulic pushing part is backed against the back wall, and the front hydraulic push rod is pushed behind the rotating part. The front end rotary jacking pipe of the rotating part of the rotary pipe jacking device is installed with a spiral concrete pipe. The spiral concrete pipe Outside the head concrete pipe, a rotating connection part is processed on the outer ring of the reserved socket pipe thickness, and 8 transmission keys are evenly distributed around the rotating connection part. It is connected to the rotary jacking device through the transmission keys. The outer wall of the spiral concrete pipe is processed with a spiral blade, and a grouting pipe is processed along the outer circumference of the concrete pipe at the middle position of the spiral blade. A slurry outlet is processed on the outer surface of the grouting pipe. The external connection port on the end face of the grouting pipe is connected to the discharge port of the grouting machine. Water or cement slurry enters the grouting pipe through the external connection port, and then enters the gap between the spiral concrete pipe and the soil layer through the slurry outlet. The two spiral concrete pipes are connected by a socket pipe. A connection hole is left at the socket pipe connection. They are connected together by bolts, and then cement slurry is injected to fill and seal.

[0007] The concrete pipe of the spiral concrete pipe is made of reinforced concrete, and the spiral blade, the rotating connection part and the grouting pipe are made of Q235A.

[0008] The transmission key processed on the rotating connection part of the spiral concrete pipe cooperates with the transmission groove of the rotating jacking device for transmission connection.

[0009] The spiral concrete pipe has a length of 2000mm-2500mm and is laid on the entire rainwater pipeline through a socket-and-spigot connection.

[0010] The construction method of the rotary pipe jacking mechanism is as follows:

[0011] S1. Elevation setting out and equipment entering the factory

[0012] According to the elevation and coordinates provided by the construction unit, obtain the elevation and centerline data, measure the actual elevation, centerline and well section distance between the entrance and exit, and use a crane to lift the equipment into the pre-excavated foundation pit;

[0013] S2. Equipment Installation

[0014] Lay a track outside the measured entrance to the tunnel, install the rotary pipe jacking device on the track, with the back of the hydraulic jacking unit against the back wall, and place the grouting machine side by side next to the rotary pipe jacking device;

[0015] S3. Spiral concrete pipe advancement

[0016] Insert the prefabricated spiral concrete pipe head rotating connection part into the rotary jacking device, place the other end of the spiral concrete pipe against the outside of the hole entrance, connect the grouting machine outlet to the external connection port of the grouting pipe end face, start the hydraulic jacking part of the rotary jacking device, slightly insert one end of the spiral concrete pipe into the soil layer, then start the rotating part of the rotary jacking device, and the spiral blade on the outside of the spiral concrete pipe cuts into the soil layer. The grouting machine is started, and water is injected into the grouting pipe of the spiral concrete pipe. Water flows out of the grouting pipe, wetting the soil layer around the spiral concrete pipe, softening the soil layer and reducing the resistance of the spiral concrete pipe entering the soil layer. The hydraulic jack pushes the spiral concrete pipe into the soil layer.

[0017] S4. Laying of rainwater pipes

[0018] After the entire spiral concrete pipe is pushed into the soil layer, the rotary jacking device retreats and detaches from the spiral concrete pipe. The earth and stone discharged during the jacking process are transported out manually or mechanically. The earth and stone transport box is loaded with earth and stone and lifted out of the foundation pit by a lifting device. Then, the other end of a new spiral concrete pipe is connected to the rotary connection part of the spiral concrete pipe pushed into the soil layer using a socket pipe. The rotary connection part of the new spiral concrete pipe is connected to the rotary jacking device. The new spiral concrete pipe is pushed in according to the construction method of the previous step. And so on, the spiral concrete pipe of the entire rainwater pipeline is laid.

[0019] S5. Measurement correction

[0020] After the entire section is jacked up, measure the center position and elevation at each pipe joint. If there is a misalignment, measure the height difference of the misalignment to measure the elevation and longitudinal slope of the entire section. The deviation between the elevation and the center must be within the allowable value.

[0021] If there is an error in the pipe jacking, the error correction is carried out step by step. It is impossible to correct the pipe immediately after the error is formed. It should be done slowly to gradually reset the pipe. Do not make sudden corrections to avoid the opposite effect.

[0022] S6. Grouting around pipes

[0023] After the pipeline is jacked, the grouting machine will pressurize cement slurry (with a ratio of 1:1) through the grouting pipe, and grouting will be carried out in sections from one end of the rainwater pipe to the other end. Grouting will be carried out simultaneously from the top, side and bottom grouting pipes. Grouting will be stopped when overflow occurs in the grouting pipe at the other end or the grouting pressure reaches 2MPa.

[0024] S7. Equipment dismantling and removal

[0025] After the circumferential grouting is completed and the slurry has initially set, the grouting holes are sealed, the rotary jacking device and the grouting machine are removed and loaded, and the rotary jacking device, the excess spiral concrete pipes and the grouting machine are lifted out of the foundation pit by a lifting device and loaded onto a truck for departure.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1) The rotary pipe jacking construction has high efficiency, simple equipment, small floor space, small workload for construction personnel, and reduced labor intensity.

[0028] 2) The rotary pipe jacking has low construction site requirements, is flexible and convenient to construct, has a small groundbreaking surface, a small amount of earth and stone discharged, and has a small workload for deviation correction, thereby improving construction progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The present invention is a structural schematic diagram of a rotary pipe jacking construction mechanism and a construction method thereof.

[0030] Figure 2 It is a schematic diagram of a concrete pipe structure of a rotary pipe jacking construction mechanism and a construction method thereof according to the present invention.

[0031] Figure 3 This is a schematic diagram of the manual soil cleaning structure of a rotary pipe jacking construction mechanism and its construction method described in the present invention.

[0032] Figure 4 This is a schematic diagram of the mechanical soil clearing structure of a rotary pipe jacking construction mechanism and its construction method described in the present invention.

[0033] In the figure: 1. Rotating pipe jacking device 2. Spiral concrete pipe 3. Back wall 4. Grouting machine 5. Lifting device

[0034] 6. Earthwork transport box 7. Socket pipe 8. Earthwork 9. Earth extraction device 10. Conveyor belt

[0035] 11. Rotating unit 12. Hydraulic thrust unit 21. Concrete pipe 22. Spiral blade 23. Grouting pipe

[0036] 24. Rotary connection 25. Transmission key DETAILED DESCRIPTION

[0037] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0038] like Figure 1As shown, the rotary jacking construction mechanism includes a lifting device 5, an earth and stone transport box 6, a grouting machine 4, and a back wall 3. The lifting device 5 lifts the earth and stone transport box 6 out of the foundation pit through a steel wire rope. The earth and stone transport box 6 is filled with earth and stone 8 discharged during the jacking process. After the earth and stone transport box 6 is lifted out of the foundation pit by the lifting device 5, it is poured into a transfer vehicle parked next to it and transported to a designated earth and stone unloading location for tilting. It cannot be randomly stacked or landfilled. The grouting machine 4 presses water or cement slurry toward the outer wall of the pipe through the grouting pipe 23. The back wall 3 is located at the rear of the overall mechanism and plays the role of bearing the reaction force in the jacking thrust.

[0039] like Figure 1 、 2 As shown, the rotary jacking construction mechanism also includes a rotary jacking device 1, a spiral concrete pipe 2, and a socket pipe 7. The rotary jacking device 1 is divided into a hydraulic jacking part 12 and a rotating part 11. The hydraulic jacking part 12 is backed by the back wall 3, and the front hydraulic jacking rod is pushed against the back of the rotating part 11. The back wall 3 bears the backward thrust during the hydraulic jacking process, giving the spiral concrete pipe 2 a reliable forward thrust. The spiral concrete pipe 2 is installed in the front rotary jacking pipe of the rotating part 11 of the rotary jacking device 1.

[0040] like Figure 2 As shown, the outer surface of the head concrete pipe 21 of the spiral concrete pipe 2 is provided with a rotating connection portion 24 on the outer ring of the reserved socket pipe 7, and 8 transmission keys 25 are evenly distributed around the rotating connection portion 24. The rotating connection portion 24 is connected to the rotating jacking device 1 through the transmission key 25. The front end of the rotating portion 11 of the rotating jacking device 1 is processed with a rotating jacking pipe, and a transmission groove is processed inside the rotating jacking pipe. The rotating connection portion 24 of the spiral concrete pipe 2 is processed with a transmission key 25 around it. The transmission groove and the transmission key 25 are matched and connected, and the rotating torque and forward thrust are transmitted to the spiral concrete pipe 2 through the rotating jacking pipe. The outer wall of the spiral concrete pipe 2 is processed with a spiral blade 22. The spiral blade 22 rotates during the jacking process to cut the soil layer and move the soil. The layers are broken up to reduce the resistance of the jacking pipe and assist the smooth progress of the jacking work. A grouting pipe 23 is processed along the outer circumference of the concrete pipe 21 at the middle position of the spiral blade 22. A slurry outlet is processed on the outer surface of the grouting pipe 23. The external connection port on the end face of the grouting pipe 23 is connected to the discharge port of the grouting machine 4. Water or cement slurry enters the grouting pipe 23 through the external connection port, and then enters the gap between the spiral concrete pipe 2 and the soil layer through the slurry outlet. In the process of rotating the jacking pipe, water is passed into the grouting pipe 23, and the water is injected into the soil layer to reduce the hardness of the soil layer, making it easier for the spiral blade 22 to cut the soil layer and ensure smooth jacking. When the jacking is completed, cement slurry is passed into the grouting pipe 23 for grouting around the pipe.

[0041] like Figure 1As shown, the two spiral concrete pipes 2 are connected by a socket pipe 7, and a connection hole is left at the connection of the socket pipe 7. They are connected together by bolts, and then cement slurry is injected to fill and seal. The socket pipe 7 connects the two spiral concrete pipes 2, so that the concrete pipes 2 are connected and tightened, and can rotate together with the torsional force delivered by the rotating connection part 24 to cut the soil layer, and then use cement slurry to seal to achieve a good seal.

[0042] like Figure 2 As shown, the concrete pipe 21 of the spiral concrete pipe 2 is made of reinforced concrete. Since rainwater flows into the spiral concrete pipe 2, which has a certain corrosiveness, the reinforced concrete structure can effectively resist corrosion. The spiral blade 22, the rotating connection part 24, and the grouting pipe 23 are made of Q235A. Since these components need to be connected or cut, they need to have a certain degree of toughness while requiring a certain degree of rigidity, so low carbon steel Q235A is selected as the main material.

[0043] like Figure 2 As shown, the transmission key 25 processed on the rotating connection part 24 of the spiral concrete pipe 2 is matched with the transmission groove of the rotary jacking device 1 for transmission connection. The transmission groove and the transmission key 25 are matched with each other in a clearance, which ensures that the transmission can be well disengaged at the same time, ensuring smooth construction.

[0044] like Figure 1 As shown, the spiral concrete pipe 2 is 2000mm-2500mm long and is laid on the entire rainwater pipeline through a socket pipe 7. A whole rainwater pipeline requires different numbers of spiral concrete pipes 2 according to the length. The spiral concrete pipes 2 are connected together through a socket pipe 7 and laid in the underground pipeline.

[0045] like Figure 1 As shown, the construction method of the rotating pipe jacking mechanism is as follows:

[0046] S1. Elevation setting out and equipment entering the factory

[0047] According to the elevation and coordinates provided by the construction unit, obtain the elevation and centerline data, measure the actual elevation, centerline and well section distance between the entrance and exit, and use the lifting device 5 to hoist the equipment into the pre-excavated foundation pit;

[0048] S2. Equipment Installation

[0049] Lay a track outside the measured entrance to the cave, install the rotary pipe jacking device 1 on the track, with the back of the hydraulic jacking part 12 against the back wall 3, and place the grouting machine 4 side by side next to the rotary pipe jacking device 1;

[0050] S3. Spiral concrete pipe advancement

[0051] Insert the prefabricated spiral concrete pipe 2 head rotating connection part 24 into the rotary jacking device 1, and the other end of the spiral concrete pipe 2 is against the outside of the entrance to the cave. Connect the discharge port of the grouting machine 4 with the external connection port of the grouting pipe 23 end face, start the hydraulic jacking part 12 of the rotary jacking device 1, and slightly push one end of the spiral concrete pipe 2 into the soil layer. Then start the rotating part 11 of the rotary jacking device 1, and the spiral blade 22 on the outside of the spiral concrete pipe 2 cuts into the soil layer. The grouting machine 4 is started, and water is injected into the grouting pipe 23 of the spiral concrete pipe 2. The grouting pipe 23 discharges water, which wets the soil layer around the spiral concrete pipe 2, softens the soil layer, and reduces the resistance of the spiral concrete pipe 2 to enter the soil layer. The hydraulic jack pushes the spiral concrete pipe 2 into the soil layer.

[0052] S4. Laying of rainwater pipes

[0053] After the entire spiral concrete pipe 2 is pushed into the soil layer, the rotary jacking device 1 retreats and disengages from the spiral concrete pipe 2. The earth and stone 8 discharged during the jacking process is transported out manually or mechanically. The earth and stone transport box 6 is loaded with the earth and stone 8 and lifted out of the foundation pit by the lifting device 5. Then, the other end of a new spiral concrete pipe 2 is connected to the rotary connecting portion 24 of the spiral concrete pipe 2 pushed into the soil layer by using a socket pipe 7. The rotary connecting portion 24 of the new spiral concrete pipe 2 is connected to the rotary jacking device 1. The new spiral concrete pipe 2 is continued to be pushed in according to the construction method of the previous step. And so on, the spiral concrete pipe 2 of the entire rainwater pipeline is laid.

[0054] S5. Measurement correction

[0055] After the entire section is jacked up, measure the center position and elevation at each pipe joint. If there is a misalignment, measure the height difference of the misalignment to measure the elevation and longitudinal slope of the entire section. The deviation between the elevation and the center must be within the allowable value.

[0056] If there is an error in the pipe jacking, the error correction is carried out step by step. It is impossible to correct the pipe immediately after the error is formed. It should be done slowly to gradually reset the pipe. Do not make sudden corrections to avoid the opposite effect.

[0057] S6. Grouting around pipes

[0058] After the pipeline is pushed forward, the grouting machine 4 pressurizes cement slurry (with a ratio of 1:1) through the grouting pipe 23, and performs grouting in sections from one end of the rainwater pipe to the other end. During grouting, grouting is performed simultaneously from the grouting pipes 23 at the top, side, and bottom. Grouting is stopped when overflow occurs in the grouting pipe 23 at the other end or the grouting pressure reaches 2 MPa.

[0059] S7. Equipment dismantling and removal

[0060] After the circumferential grouting is completed and the slurry has initially set, the grouting holes are sealed, the rotary jacking device 1 and the grouting machine 4 are dismantled and loaded, and the rotary jacking device 1, the redundant spiral concrete pipe 2 and the grouting machine 4 are lifted out of the foundation pit by the lifting device 5 and loaded onto a truck for departure.

[0061] The following examples are implemented under the premise of the technical solution of the present invention, and provide detailed implementation methods and specific operating processes, but the scope of protection of the present invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.

[0062] [Example 1]

[0063] Manual soil cleaning

[0064] like Figure 1 As shown, the rotary pipe jacking device 1, the spiral concrete pipe 2, the back wall 3, and the grouting machine 4 are installed in a pre-dug foundation pit, and the rotary pipe jacking device 1 is installed at the pipe jacking position.

[0065] like Figure 1 As shown, one end of the spiral concrete pipe 2 is placed against the designed jacking position, and the other end is connected to the rotary jacking device 1. The rotary jacking device 1 is started to jack the spiral concrete pipe 2 into the soil layer.

[0066] like Figure 3 As shown, when the entire spiral concrete pipe 2 is pushed into the soil layer, the rotary jacking device 1 is retracted, and a person manually enters the pipe to load the earth and rock 8 discharged from the pipe into the earth and rock transport box 6, which is then transported to the foundation pit outside the pipe. The earth and rock transport box 6 is lifted out by the lifting device 5, and the earth and rock 8 is poured into a transfer vehicle on the roadside for dumping at a fixed point.

[0067] like Figure 1 As shown, two spiral concrete pipes 2 are connected by a socket pipe 7, and the pipes are pushed forward. After a certain distance, the soil is cleared mechanically until the entire rainwater pipeline is laid.

[0068] [Example 2]

[0069] Mechanical soil cleaning

[0070] like Figure 1 As shown, the rotary pipe jacking device 1, the spiral concrete pipe 2, the back wall 3, and the grouting machine 4 are installed in a pre-dug foundation pit, and the rotary pipe jacking device 1 is installed at the pipe jacking position.

[0071] like Figure 1 As shown, one end of the spiral concrete pipe 2 is placed against the designed jacking position, and the other end is connected to the rotary jacking device 1. The rotary jacking device 1 is started to jack the spiral concrete pipe 2 into the soil layer.

[0072] like Figure 4As shown, when the entire spiral concrete pipe 2 is pushed into the soil layer, the rotary jacking device 1 is retreated, the soil extraction device 9 is arranged in the earth and rock 8, the soil extraction device is started, and the earth and rock 8 is moved to the conveyor belt 10. The earth and rock 8 is concentrated into the earth and rock transport box 6 through the conveyor belt 10, and then transported to the foundation pit outside the pipe. The earth and rock transport box 6 is lifted out by the lifting device 5, and the earth and rock is poured into the transfer vehicle on the roadside and dumped at a fixed point.

[0073] like Figure 1 As shown, two spiral concrete pipes 2 are connected by a socket pipe 7, and the pipes are pushed forward. After a certain distance, the soil is cleared mechanically until the entire rainwater pipeline is laid.

[0074] The present invention has high construction efficiency, simple equipment, small floor space, small workload for construction personnel, reduced labor intensity, low site requirements, flexible and convenient construction, small groundbreaking surface, small amount of earth and stone discharge, small workload for deviation correction, and improved construction progress.

Claims

1. A rotary pipe jacking construction method, wherein the rotary pipe jacking construction mechanism includes a lifting device, an earthwork transport box, a grouting machine, and a back wall. The lifting device lifts the earthwork transport box out of the foundation pit through a steel wire rope, and the earthwork transport box is used to hold the earthwork discharged during the pipe jacking process. The grouting machine presses water or cement slurry from the grouting pipe to the outer wall of the pipe. The back wall is located at the rear of the entire mechanism, characterized in that: The rotary jacking construction mechanism also includes a rotary jacking device, a spiral concrete pipe, and a socket pipe. The rotary jacking device is divided into a hydraulic jacking part and a rotary part. The hydraulic jacking part is backed by the back wall, and the front hydraulic jack is pushed against the back of the rotary part. The spiral concrete pipe is installed in the front rotary jacking pipe of the rotary part of the rotary jacking device. The outer ring of the concrete pipe at the head of the spiral concrete pipe is reserved for the thickness of the socket pipe. The rotary connection part is processed on the outer ring, and 8 transmission keys are evenly distributed around the rotary connection part. It is connected to the rotary jacking device through the transmission key. The outer wall of the spiral concrete pipe is processed with a spiral blade. A grouting pipe is processed along the outer circumference of the concrete pipe at the middle position of the spiral blade. A slurry outlet is processed on the outer surface of the grouting pipe. The external connection port on the end face of the grouting pipe is connected to the discharge port of the grouting machine. Water or cement slurry enters the grouting pipe through the external connection port, and then enters the gap between the spiral concrete pipe and the soil layer through the slurry outlet. The two spiral concrete pipes are connected by a socket pipe. A connection hole is left at the connection of the socket pipe. They are connected together by bolts, and then cement slurry is injected to fill and seal. The construction method of the rotary pipe jacking construction mechanism is as follows: S1. Elevation setting out and equipment entering the factory According to the elevation and coordinates provided by the construction unit, obtain the elevation and centerline data, measure the actual elevation, centerline and well section distance between the entrance and exit, and use a crane to lift the equipment into the pre-excavated foundation pit; S2. Equipment Installation Lay a track outside the measured entrance to the tunnel, install the rotary pipe jacking device on the track, with the back of the hydraulic jacking unit against the back wall, and place the grouting machine side by side next to the rotary pipe jacking device; S3. Spiral concrete pipe advancement Insert the prefabricated spiral concrete pipe head rotating connection part into the rotary jacking device, place the other end of the spiral concrete pipe against the outside of the hole entrance, connect the grouting machine outlet to the external connection port of the grouting pipe end face, start the hydraulic jacking part of the rotary jacking device, slightly insert one end of the spiral concrete pipe into the soil layer, then start the rotating part of the rotary jacking device, and the spiral blade on the outside of the spiral concrete pipe cuts into the soil layer. The grouting machine is started, and water is injected into the grouting pipe of the spiral concrete pipe. Water flows out of the grouting pipe, wetting the soil layer around the spiral concrete pipe, softening the soil layer and reducing the resistance of the spiral concrete pipe entering the soil layer. The hydraulic jack pushes the spiral concrete pipe into the soil layer. S4. Laying of rainwater pipes After the entire spiral concrete pipe is pushed into the soil layer, the rotary jacking device retreats and detaches from the spiral concrete pipe. The earth and stone discharged during the jacking process are transported out manually or mechanically. The earth and stone transport box is loaded with earth and stone and lifted out of the foundation pit by a lifting device. Then, the other end of a new spiral concrete pipe is connected to the rotary connection part of the spiral concrete pipe pushed into the soil layer using a socket pipe. The rotary connection part of the new spiral concrete pipe is connected to the rotary jacking device. The new spiral concrete pipe is pushed in according to the construction method of the previous step. And so on, the spiral concrete pipe of the entire rainwater pipeline is laid. S5. Measurement correction After the entire section is jacked up, the center position and elevation of each pipe joint are measured. If there is a misalignment, the height difference of the misalignment is measured to measure the elevation and longitudinal slope of the entire section. The deviation between the elevation and the center is within the allowable value. If there is an error in the pipe jacking, the error correction is carried out step by step. It is impossible to correct the pipe immediately after the error is formed. It should be done slowly to gradually reset the pipe. Do not make sudden corrections to avoid the opposite effect. S6. Grouting around pipes After the pipeline is jacked, the grouting machine will pressurize cement slurry through the grouting pipe, and grouting will be carried out in sections from one end of the rainwater pipe to the other end. Grouting will be carried out simultaneously from the top, side and bottom grouting pipes. Grouting will be stopped when overflow occurs in the grouting pipe at the other end or the grouting pressure reaches 2MPa. S7. Equipment dismantling and removal After the circumferential grouting is completed and the slurry has initially set, the grouting holes are sealed, the rotary jacking device and the grouting machine are removed and loaded, and the rotary jacking device, the excess spiral concrete pipes and the grouting machine are lifted out of the foundation pit by a lifting device and loaded onto a truck for departure.

2. A rotary pipe jacking construction method according to claim 1, characterized in that: The concrete pipe of the spiral concrete pipe is made of reinforced concrete, and the spiral blade, the rotating connection part and the grouting pipe are made of Q235A.

3. A rotary pipe jacking construction method according to claim 1, characterized in that: The transmission key processed on the rotating connection part of the spiral concrete pipe cooperates with the transmission groove of the rotating jacking device for transmission connection.

4. A rotary pipe jacking construction method according to claim 1, characterized in that: The spiral concrete pipe has a length of 2000mm-2500mm and is laid on the entire rainwater pipeline through a socket-and-spigot connection.

Images