Construction method for pipe roofing of road underpass channel
By simultaneously pushing the drill rod and steel pipe during construction, combined with motor drive and spiral roadway for soil removal, the construction process of the pipe jacking for road underpasses has been optimized, solving the problem of low construction efficiency in existing technologies and achieving efficient and stable construction results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-02-28
- Publication Date
- 2026-04-14
AI Technical Summary
In existing technologies, the construction efficiency of pipe jacking for road underpasses is low. The separate operation of steel pipes and drill rods leads to complicated construction steps. Drilling is affected by soil resistance, resulting in long construction cycles and high costs.
The drilling rod and steel pipe are pushed synchronously by a pusher frame, and the drill rod is driven to rotate by a motor. Combined with the spiral channel and spiral arm, the soil is discharged, and cement grout is injected to form a stable pipe curtain, thus optimizing the construction process.
It improved the continuity and efficiency of construction, reduced the time spent on each step of the operation, reduced the problems of poor soil removal and frequent cleaning, simplified subsequent reinforcement operations, and improved the overall construction efficiency and quality.
Smart Images
Figure CN121854072A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the technical field of road underpasses, and more specifically, to a method for constructing pipe jacking systems for road underpasses. Background Technology
[0002] In urban underground engineering, road underpasses are common infrastructure, and pipe jacking construction is often used for the construction of underpasses due to its advantages in rapid excavation and subsequent support.
[0003] However, in existing traditional pipe jacking construction, the advancement of steel pipes and the drilling of drill rods are usually carried out separately. This means that each time a steel pipe is replaced, the drill rods need to be disassembled and rearranged. This not only increases construction time but also breaks down the construction process into multiple independent steps, making it difficult to efficiently connect the entire construction process. For example, steel pipe installation and drill rod drilling cannot be completed simultaneously but must be carried out sequentially, which limits the overall efficiency of construction.
[0004] Secondly, in order to solve the problem of soil accumulation at the front end of the steel pipe or drill rod, the soil discharge channel needs to be cleaned frequently during construction, which not only prolongs the construction period but also increases labor and equipment costs.
[0005] Furthermore, in existing technologies, drill pipes are easily affected by soil resistance during drilling, especially when the performance of the drill bit is not optimized. This resistance will further slow down the drilling speed, which is more pronounced under complex geological conditions and directly affects the overall efficiency of pipe jacking construction. Summary of the Invention
[0006] The purpose of this invention is to provide a method for constructing pipe jacking for road underpasses, aiming to solve the problem of low construction efficiency of pipe jacking for road underpasses in the prior art.
[0007] This invention is implemented as follows: a method for constructing a pipe jacking system for road underpasses, comprising the following construction steps: 1) The starting pit and receiving pit are constructed on both sides of the road foundation, and the road foundation is located between the starting pit and the receiving pit. 2) A movable frame that moves relative to the road foundation is arranged in the starting pit. The movable frame is equipped with a pusher that moves toward or away from the road foundation. The pusher is equipped with a motor, and the motor is connected to a drill rod. The front end of the drill rod has a drill bit. The drill rod is provided with a spiral arm on its outer periphery. The spiral arm is arranged to spiral along the axial direction of the drill rod, and the spiral arm is arranged to form a spiral path around the outer periphery of the drill rod. 3) A steel pipe is arranged on the movable frame. The steel pipe has a cavity that runs through the front and rear. The front end of the steel pipe has a front opening, and the rear end of the steel pipe has a rear opening. The front end of the drill rod passes through the front opening, and the drill bit is exposed in front of the steel pipe. The rear end of the drill rod passes through the rear opening and is connected to the motor. The rear end of the steel pipe abuts against the push frame. The front end of the spiral track is connected to the front opening, and the rear end of the spiral track is connected to the rear opening. 4) The pusher frame pushes the drill rod and steel pipe to move synchronously toward the road foundation, the motor drives the drill rod to rotate synchronously, and the drill bit rotates synchronously with the drill rod; 5) The drill rod and drill bit drill into the road foundation, and the steel pipe moves synchronously in the road foundation until the steel pipe passes through the road foundation, from the starting pit to the receiving pit, and then the drill rod is withdrawn from the cavity; the drilled soil enters the cavity through the front opening, flows along the spiral path, and is discharged through the rear opening. 6) Repeat construction steps 3) to 5) until multiple steel pipes are formed in the road foundation; 7) Cement grout is injected into the cavities of the plurality of steel pipes, and the cement grout solidifies in the cavities, combining with the steel pipes as one unit, and the plurality of steel pipes form a pipe curtain surrounding the outside of the underpass.
[0008] Furthermore, in construction step 1), a back wall is formed on the side of the starting pit, and the back wall is arranged opposite to the road foundation; in construction step 2), after the mobile frame is placed in the starting pit, the mobile frame abuts against the back wall; the bottom of the starting pit is provided with a horizontally arranged bottom guide rail, and the mobile frame is movably placed on the bottom guide rail. In construction step 5), after the steel pipe is inserted into the road foundation and the drill rod is withdrawn from the cavity, the moving frame moves along the bottom guide rail to move the drill rod to the next work position.
[0009] Furthermore, in construction step 2), the movable frame includes a longitudinally arranged support frame and a strip-shaped fixed frame. The bottom of the support frame is movably abutted against the bottom guide rail. The fixed frame is arranged on the support frame and faces the road foundation. The push frame is arranged on the fixed frame. In construction step 5), during the drilling process of the drill rod and drill bit in the road foundation, the push frame moves along the fixed frame.
[0010] Furthermore, in construction step 2), the fixing frame has a guide groove arranged in a strip shape, the guide groove passes through the front end of the fixing frame to form an opening facing the road foundation, the push frame is movably placed in the guide groove, and the drill rod extends in the guide groove and passes through the opening, facing the road foundation. In construction step 3), after the steel pipe is fitted over the drill rod, the steel pipe is placed in the guide groove; in construction step 5), during the drilling of the road foundation, the pusher moves along the guide groove toward the road foundation, pushing the drill rod and steel pipe to move toward the road foundation synchronously.
[0011] Furthermore, in construction step 2), the rear end of the fixed frame is provided with a rear end plate, and the pushing frame is arranged at intervals with the rear end plate to form a pushing interval; a jack is provided in the pushing interval, the rear end of the jack is fixedly abutted against the rear end plate, and the front end of the jack abuts against the pushing frame. In construction step 5), during the drilling of the road foundation, the jack pushes the pusher frame to move along the guide groove toward the road foundation.
[0012] Furthermore, in construction step 2), the drill bit is provided with a correction inclined wall, the rear end of which penetrates the outer periphery of the drill bit, and the front end of which penetrates the front end of the drill bit; the front end of the correction inclined wall extends forward to form an inclined plate, which is formed in front of the drill bit and extends in the same direction as the correction inclined wall; the end of the inclined plate is pointed and is flush with the outer periphery of the drill bit. In construction step 5), during the drilling process of the drill rod and drill bit in the road foundation, the inclined plate rotates in the road foundation to extract soil from the road foundation. The extracted soil enters the pipe cavity through the front opening, flows along the spiral path, and is discharged through the rear opening.
[0013] Furthermore, in construction step 5), after the steel pipe and drill rod have been drilled to a set length in the road foundation, a correction operation is performed on the steel pipe, including the following correction steps: 5.1) The drill rod stops rotating; 5.2) Measure the levelness of the steel pipe to determine its tilt direction; 5.3) By rotating the drill rod, adjust the tilt direction of the drill bit's tilting plate so that the tilt direction of the tilting plate is opposite to the tilt direction of the steel pipe; 5.4) Insert the inclined plate into the soil of the road foundation so that the inclined plate bears a pressure opposite to the inclination direction of the steel pipe; 5.5) Start the drill rod to rotate in the road foundation. The drill rod rotates away from the tilt direction of the steel pipe, and the steel pipe moves synchronously away from the tilt direction in the road foundation.
[0014] Furthermore, in construction step 5), after the steel pipe is inserted into the road foundation and the drill rod is withdrawn from the pipe cavity, the rear end opening of the steel pipe is sealed with a cover plate. The cover plate is provided with a rear end grouting hole, and the outer circumference of the steel pipe is provided with multiple outer circumference grout outlet holes. A quick-setting agent is injected into the outer circumference of the rear end opening. The quick-setting agent mixes with the soil to form a closed outer circumference ring, which surrounds the outer circumference of the rear end opening. Cement grout is injected into the pipe cavity under high pressure through the rear grouting hole. The cement grout fills the pipe cavity and is sprayed outward into the soil through multiple peripheral grout outlet holes in a splitting manner, where it combines with the soil.
[0015] Furthermore, in construction step 3), the cavity is provided with multiple spiral plates, which are arranged at intervals along the circumference of the cavity and spirally arranged along the axial direction of the cavity; the spiral plates are arranged opposite to the spiral channel, the inner end of the spiral plate is connected to the inner sidewall of the cavity, the outer end of the spiral plate is arranged towards the spiral channel, and the outer end of the spiral plate is provided with multiple spiral grooves arranged at intervals, which are spirally arranged in the same direction as the spiral plate; In construction step 5), during the synchronous drilling of the steel pipe and drill rod in the road foundation, the soil in the spiral channel moves spirally along the direction from the front opening to the rear opening, and the spiraling plate spirals and cuts the soil in the spiral channel so that the soil in the spiral channel is arranged in a scattered manner.
[0016] Furthermore, in construction step 3), along the direction from the inside to the outside of the spiral plate, the rear end of the spiral plate gradually narrows, and the inner end of the spiral plate has inner edge on both sides. The inner edge is provided with an elastic strip, which extends along the length direction of the inner edge and extends outward to form an elastic plate that is away from the spiral plate. The elastic plate covers the inner side of the cavity. In construction step 5), during the synchronous drilling of the steel pipe and drill rod in the road foundation, the soil in the spiral channel moves spirally along the direction from the front opening to the rear opening. The elastic strip and elastic sheet are squeezed and deformed, reducing the contact area between the soil and the spiral sheet, as well as reducing the contact area between the soil and the inner side of the pipe cavity.
[0017] Compared with existing technologies, the construction method for pipe jacking in road underpasses provided by this invention improves construction efficiency by optimizing the construction process. Specifically, the drilling rod and steel pipe are pushed synchronously by a pusher frame, and the drill rod is rotated by a motor, so that drilling and steel pipe installation are completed simultaneously, greatly reducing the time of step-by-step operations and improving the continuity and efficiency of construction.
[0018] In addition, the spiral ramp and spiral arm provide a drainage path for the soil, reducing the phenomenon of poor soil drainage and easy blockage during construction, and avoiding the extended construction period due to frequent cleaning of the soil drainage channel.
[0019] Finally, by injecting cement grout, the steel pipe and cement grout are bonded together to form a stable pipe curtain, which reduces the complexity of subsequent reinforcement operations and further improves construction efficiency. Attached Figure Description
[0020] Figure 1 This is a schematic flowchart of the pipe jacking construction method for road underpasses provided by the present invention; Figure 2 This is a simplified structural diagram of both sides of the road foundation provided by the present invention; Figure 3 This is a partial cross-sectional schematic diagram of the drill bit provided by the present invention; Figure 4 This is a partial cross-sectional schematic diagram of the steel pipe provided by the present invention; Figure 5 This is an internal schematic diagram of the steel pipe and drill rod provided by the present invention; Figure 6 This is a cross-sectional schematic diagram of the spiral plate provided by the present invention; In the diagram: road foundation 100, launching pit 101, receiving pit 102, back wall 103, bottom guide rail 104; Support frame 200, fixed frame 201, push frame 202, motor 203, rear end plate 204, jack 205; Steel pipe 300, pipe cavity 301, cover plate 302, rear grouting hole 303, outer circumferential grout outlet hole 304, outer circumferential ring 305; Drill pipe 400, drill bit 401, inclined wall for correction 402, inclined plate 403, swivel arm 404, swivel track 405; Spiral plate 500, spiral groove 501, elastic strip 502, elastic plate 503. Detailed Implementation
[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.
[0022] The implementation of the present invention will be described in detail below with reference to specific embodiments.
[0023] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.
[0024] Reference Figure 1-6 The image shows a preferred embodiment of the present invention.
[0025] The construction method for pipe jacking in road underpasses includes the following steps: 1) A launching pit 101 and a receiving pit 102 are constructed on both sides of the road foundation 100, with the road foundation 100 located between the launching pit 101 and the receiving pit 102. 2) A movable frame that moves relative to the road foundation 100 is arranged in the starting pit 101. The movable frame is equipped with a push frame 202 that moves toward or away from the road foundation 100. The push frame 202 is equipped with a motor 203. The motor 203 is connected to a drill rod 400. The front end of the drill rod 400 has a drill bit 401. A spiral arm 404 is provided on the outer periphery of the drill pipe 400. The spiral arm 404 is spirally arranged along the axial direction of the drill pipe 400, and the spiral arm 404 is arranged around the outer periphery of the drill pipe 400 to form a spiral channel 405. 3) A steel pipe 300 is arranged on the moving frame. The steel pipe 300 has a cavity 301 that runs through it from front to back. The front end of the steel pipe 300 has a front opening and the rear end of the steel pipe 300 has a rear opening. The front end of the drill rod 400 passes through the front opening, and the drill bit 401 is exposed in front of the steel pipe 300. The rear end of the drill rod 400 passes through the rear opening and is connected to the motor 203. The rear end of the steel pipe 300 abuts against the push frame 202. The front end of the spiral track 405 is connected to the front opening, and the rear end of the spiral track 405 is connected to the rear opening. 4) The pusher frame 202 pushes the drill rod 400 and steel pipe 300 to move synchronously toward the road foundation 100, the motor 203 drives the drill rod 400 to rotate synchronously, and the drill bit 401 rotates synchronously with the drill rod 400. 5) The drill rod 400 and drill bit 401 drill into the road foundation 100, and the steel pipe 300 moves synchronously in the road foundation 100 until the steel pipe 300 passes through the road foundation 100, from the starting pit 101 to the receiving pit 102, and then the drill rod 400 is withdrawn from the cavity 301; the drilled soil enters the cavity 301 through the front opening, flows along the spiral channel 405, and is discharged through the rear opening; 6) Repeat construction steps 3) to 5) until multiple steel pipes 300 are formed in the road foundation 100; 7) Cement grout is injected into the cavities 301 of multiple steel pipes 300. The cement grout solidifies in the cavities 301 and combines with the steel pipes 300 to form a pipe curtain surrounding the outside of the underpass.
[0026] The above-mentioned method for constructing pipe jacking for road underpasses improves construction efficiency by optimizing the construction process. Specifically, the drilling rod 400 and steel pipe 300 are pushed synchronously by the pusher 202, and the drill rod 400 is rotated by the motor 203, so that drilling and installation of steel pipe 300 are completed at the same time, which greatly reduces the time of step-by-step operation and improves the continuity and efficiency of construction.
[0027] In addition, the spiral channel 405 and the spiral arm 404 provide a drainage path for the soil, reducing the phenomenon of poor soil drainage and easy blockage during construction, and avoiding the extended construction period due to frequent cleaning of the soil drainage channel.
[0028] Finally, by injecting cement grout, the steel pipe 300 is bonded with the cement grout to form a stable pipe curtain, which reduces the complexity of subsequent reinforcement operations and further improves construction efficiency.
[0029] In this embodiment, in construction step 1), a back wall 103 is formed on the side of the starting pit 101, and the back wall 103 is arranged opposite to the road foundation 100; in construction step 2), after the mobile frame is placed in the starting pit 101, the mobile frame abuts against the back wall 103; the bottom of the starting pit 101 is provided with a horizontally arranged bottom guide rail 104, and the mobile frame is movably placed on the bottom guide rail 104. In construction step 5), after the steel pipe 300 is inserted into the road foundation 100 and the drill rod 400 is withdrawn from the cavity 301, the moving frame moves along the bottom guide rail 104 to move the drill rod 400 to the next work position.
[0030] By abutting against the wall 103, the mobile frame is provided with stable support, making it less prone to shaking or displacement during construction, thus ensuring the stability and accuracy of the drilling rod 400 and steel pipe 300 advancement.
[0031] By placing the mobile frame on the bottom guide rail 104, it can move smoothly along the guide rail. After the steel pipe 300 is installed, the mobile frame can quickly slide along the guide rail to the next work position without complicated equipment disassembly and reinstallation, which greatly saves the work position change time and effectively improves the construction efficiency. This advantage of rapid relocation is even more obvious when multiple steel pipes 300 are constructed continuously, which can ensure the continuity and efficiency of the entire pipe curtain construction.
[0032] In this embodiment, in construction step 2), the movable frame includes a longitudinally arranged support frame 200 and a strip-shaped fixed frame 201. The bottom of the support frame 200 is movably abutted against the bottom guide rail 104. The fixed frame 201 is arranged on the support frame 200 and faces the road foundation 100. The push frame 202 is arranged on the fixed frame 201. In construction step 5), during the drilling process of the drill rod 400 and the drill bit 401 in the road foundation 100, the push frame 202 moves along the fixed frame 201.
[0033] The support frame 200 has its bottom movably abutting against the bottom guide rail 104, ensuring the overall stability and flexibility of the mobile frame. The fixed frame 201 is arranged facing the road foundation 100, providing a stable installation base for the push frame 202, which in turn pushes the frame 202 to move along the fixed frame 201, so that the drill rod 400 and drill bit 401 can move forward stably and evenly during drilling, avoiding deviations in the drilling trajectory caused by equipment shaking and improving drilling quality.
[0034] In this embodiment, in construction step 2), the fixing frame 201 has a guide groove arranged in strips. The guide groove passes through the front end of the fixing frame 201 to form an opening facing the road foundation 100. The push frame 202 is movably placed in the guide groove. The drill rod 400 extends in the guide groove and passes through the opening, facing the road foundation 100. In construction step 3), after the steel pipe 300 is installed on the drill rod 400, the steel pipe 300 is placed in the guide groove; in construction step 5), during the drilling of the drill rod 400 and drill bit 401 into the road foundation 100, the pusher 202 moves along the guide groove toward the road foundation 100, pushing the drill rod 400 and steel pipe 300 to move toward the road foundation 100 simultaneously.
[0035] By placing the pusher frame 202 movably in the guide groove, it is ensured that the drill rod 400 and the steel pipe 300 remain coaxial during the advancement process, avoiding positional deviation. When the drill rod 400 and the drill bit 401 are drilling, the pusher frame 202 moves smoothly along the guide groove, driving the drill rod 400 and the steel pipe 300 to advance synchronously, effectively reducing equipment adjustment time and improving construction efficiency. Especially in complex geological conditions where precise control of the drilling direction is required, it can improve the accuracy and reliability of construction.
[0036] In this embodiment, in construction step 2), the rear end of the fixed frame 201 is provided with a rear end plate 204, and the push frame 202 is arranged at intervals with the rear end plate 204 to form a push interval; a jack 205 is provided in the push interval, the rear end of the jack 205 is fixedly abutted against the rear end plate 204, and the front end of the jack 205 abuts against the push frame 202. In construction step 5), as the drill rod 400 and drill bit 401 are drilling into the road foundation 100, the jack 205 pushes the pusher frame 202 to move along the guide groove toward the road foundation 100.
[0037] In this way, the jack 205 provides strong and stable power for the advancement of the drill rod 400 and the steel pipe 300. When the drill rod 400 and the drill bit 401 are drilling, the jack 205 applies force evenly, pushing the pusher frame 202 to advance steadily along the guide groove. This not only improves the stability and controllability of the propulsion force, but also reduces manpower input, thereby improving construction efficiency and quality.
[0038] In this embodiment, in construction step 2), the drill bit 401 is provided with a correction inclined wall 402. The rear end of the correction inclined wall 402 penetrates the outer periphery of the drill bit 401, and the front end of the correction inclined wall 402 penetrates the front end of the drill bit 401. The front end of the correction inclined wall 402 extends forward to form an inclined plate 403. The inclined plate 403 is formed in front of the drill bit 401 and extends in the same direction as the correction inclined wall 402. The end of the inclined plate 403 is pointed and is flush with the outer periphery of the drill bit 401. In construction step 5), as the drill rod 400 and drill bit 401 drill in the road foundation 100, the inclined plate 403 rotates in the road foundation 100 to drill the soil in the road foundation 100. The drilled soil enters the cavity 301 through the front opening, flows along the spiral channel 405, and is discharged through the rear opening.
[0039] By setting up the inclined wall 402 and the inclined plate 403, an effective means of correction is provided for the drilling process. The pointed end of the inclined plate 403 can cut into the soil during drilling. During the rotation of the inclined plate 403, if the drill bit 401 deviates, the contact area and stress between the inclined plate and the soil will change, thereby generating a reaction force to correct the deviation and achieve automatic correction. This reduces the rework and adjustment time caused by the deviation of the drill bit 401, and improves the accuracy and efficiency of drilling. Especially in construction environments with complex geological conditions and uneven soil hardness, its correction advantage is more prominent, which can effectively ensure the quality and progress of pipe jacking construction.
[0040] In this embodiment, in construction step 5), after the steel pipe 300 and drill rod 400 have drilled a set length in the road foundation 100, a correction operation is performed on the steel pipe 300, including the following correction steps: 5.1) The drill rod stops rotating at 400°. 5.2) Measure the levelness of steel pipe 300 to determine the inclination direction of steel pipe 300; 5.3) By rotating the drill rod 400, adjust the tilt direction of the inclined plate 403 of the drill bit 401 so that the tilt direction of the inclined plate 403 is opposite to the tilt direction of the steel pipe 300. 5.4) Insert the inclined plate 403 into the soil of the road foundation 100 so that the inclined plate 403 bears pressure opposite to the inclination direction of the steel pipe 300; 5.5) Start the drill rod 400 to rotate in the road foundation 100. The drill rod 400 rotates away from the tilt direction of the steel pipe 300, and the steel pipe 300 moves synchronously in the road foundation 100 away from the tilt direction.
[0041] By closely linking the correction steps, the tilting problem of the 300 mm steel pipe can be detected and corrected in a timely manner, avoiding deformation of the pipe curtain structure or construction interruption due to the accumulation of tilt, reducing the risk of rework, improving construction efficiency, and ensuring the quality and stability of the pipe curtain construction.
[0042] In this embodiment, in construction step 5), after the steel pipe 300 is inserted into the road foundation 100 and the drill rod 400 is withdrawn from the cavity 301, the rear end opening of the steel pipe 300 is sealed by the cover plate 302. The cover plate 302 is provided with a rear end grouting hole 303, and the outer periphery of the steel pipe 300 is provided with multiple outer periphery grouting holes 304. A quick-setting agent is injected into the outer periphery of the rear end opening. The quick-setting agent mixes with the soil to form a closed outer periphery ring 305. The outer periphery ring 305 surrounds the outer periphery of the rear end opening. Cement grout is injected under high pressure into the cavity 301 through the rear grouting hole 303. The cement grout fills the cavity 301 and is sprayed outward into the soil in a splitting manner through multiple peripheral grout outlet holes 304, where it combines with the soil.
[0043] The end of the steel pipe 300 is sealed by the cover plate 302 to prevent soil and debris from entering, ensuring the cleanliness of the inside of the pipe cavity 301 and construction safety; while the outer ring 305 surrounds the end of the steel pipe 300, providing stable lateral support for the steel pipe 300 and enhancing the stability of the steel pipe 300 in the road foundation 100.
[0044] The high-pressure injected cement grout fills the cavity 301 and combines with the soil, further strengthening the connection between the steel pipe 300 and the surrounding soil, improving the integrity and load-bearing capacity of the pipe curtain, thereby preventing soil collapse and pipe curtain deformation, and ensuring the quality and safety of pipe curtain construction.
[0045] In this embodiment, in construction step 3), the cavity 301 is provided with a plurality of spiral plates 500. The plurality of spiral plates 500 are arranged at intervals along the circumference of the cavity 301 and spirally arranged along the axial direction of the cavity 301. The spiral plates 500 and the spiral channel 405 are arranged opposite to each other. The inner end of the spiral plate 500 is connected to the inner sidewall of the cavity 301, and the outer end of the spiral plate 500 is arranged facing the spiral channel 405. The outer end of the spiral plate 500 is provided with a plurality of spiral grooves 501 arranged at intervals. The plurality of spiral grooves 501 are spirally arranged in the same direction as the spiral plate 500. In construction step 5), during the synchronous drilling of steel pipe 300 and drill rod 400 in road foundation 100, the soil in spiral channel 405 moves spirally along the direction from the front opening to the rear opening, and spiral plate 500 spirals and cuts the soil in spiral channel 405 so that the soil in spiral channel 405 is arranged in a scattered manner.
[0046] This avoids soil accumulation and blockage within the cavity 301, ensuring smooth soil removal. Furthermore, loose soil is more easily discharged along the spiral channel 405, reducing soil removal resistance and improving soil removal efficiency. This ensures the continuity of the drilling process, especially under construction conditions with high soil viscosity, where its advantages are more pronounced, effectively improving construction efficiency and reducing the risk of equipment failure.
[0047] In this embodiment, in construction step 3), along the direction from the inside to the outside of the spiral plate 500, the rear end of the spiral plate 500 gradually shrinks. The inner ends of the spiral plate 500 have inner edge edges on both sides. The inner edge is provided with an elastic strip 502. The elastic strip 502 extends along the length direction of the inner edge and extends outward to form an elastic plate 503 that is away from the spiral plate 500. The elastic plate 503 covers the inner side of the cavity 301. In construction step 5), during the synchronous drilling of steel pipe 300 and drill rod 400 in road foundation 100, the soil in spiral channel 405 moves spirally along the direction from front opening to rear opening. Elastic strip 502 and elastic sheet 503 are squeezed and deformed, reducing the contact area between soil and spiral sheet 500, as well as reducing the contact area between soil and inner side of pipe cavity 301.
[0048] As the soil moves along the spiral path 405, the deformation of the elastic strip 502 and the elastic sheet 503 creates a tiny gap between the soil and the spiral sheet 500, reducing direct contact between the soil and the spiral sheet 500. At the same time, the surfaces of the elastic strip 502 and the elastic sheet 503 are smooth, making it difficult for soil to adhere and accumulate on their surfaces. Even if a small amount of soil adheres, it will be scraped off in time by the elastic action of the elastic strip 502 and the elastic sheet 503, thus avoiding soil accumulation.
[0049] This not only improves soil removal efficiency but also reduces the risk of equipment failure due to soil accumulation, ensuring the continuity and stability of the drilling process. Its advantages are even greater under construction conditions with high soil viscosity, effectively improving construction efficiency and reducing equipment maintenance costs.
[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A method for constructing a pipe jacking system for road underpasses, characterized in that, The construction steps include the following: 1) The starting pit and receiving pit are constructed on both sides of the road foundation, and the road foundation is located between the starting pit and the receiving pit. 2) A movable frame that moves relative to the road foundation is arranged in the starting pit. The movable frame is equipped with a pusher that moves toward or away from the road foundation. The pusher is equipped with a motor, and the motor is connected to a drill rod. The front end of the drill rod has a drill bit. The drill rod is provided with a spiral arm on its outer periphery. The spiral arm is arranged to spiral along the axial direction of the drill rod, and the spiral arm is arranged to form a spiral path around the outer periphery of the drill rod. 3) A steel pipe is arranged on the movable frame. The steel pipe has a cavity that runs through the front and rear. The front end of the steel pipe has a front opening, and the rear end of the steel pipe has a rear opening. The front end of the drill rod passes through the front opening, and the drill bit is exposed in front of the steel pipe. The rear end of the drill rod passes through the rear opening and is connected to the motor. The rear end of the steel pipe abuts against the push frame. The front end of the spiral track is connected to the front opening, and the rear end of the spiral track is connected to the rear opening. 4) The pusher frame pushes the drill rod and steel pipe to move synchronously toward the road foundation, the motor drives the drill rod to rotate synchronously, and the drill bit rotates synchronously with the drill rod; 5) The drill rod and drill bit drill into the road foundation, and the steel pipe moves synchronously in the road foundation until the steel pipe passes through the road foundation, from the starting pit to the receiving pit, and then the drill rod is withdrawn from the cavity; the drilled soil enters the cavity through the front opening, flows along the spiral path, and is discharged through the rear opening. 6) Repeat construction steps 3) to 5) until multiple steel pipes are formed in the road foundation; 7) Cement grout is injected into the cavities of the plurality of steel pipes, and the cement grout solidifies in the cavities, combining with the steel pipes as one unit, and the plurality of steel pipes form a pipe curtain surrounding the outside of the underpass.
2. The method for constructing a pipe jacking system for road underpasses as described in claim 1, characterized in that, In construction step 1), a back wall is formed on the side of the starting pit, and the back wall is arranged opposite to the road foundation; in construction step 2), after the mobile frame is placed in the starting pit, the mobile frame abuts against the back wall; the bottom of the starting pit is provided with a horizontally arranged bottom guide rail, and the mobile frame is movably placed on the bottom guide rail. In construction step 5), after the steel pipe is inserted into the road foundation and the drill rod is withdrawn from the cavity, the moving frame moves along the bottom guide rail to move the drill rod to the next work position.
3. The method for constructing a pipe jacking system for road underpasses as described in claim 1, characterized in that, In construction step 2), the movable frame includes a longitudinally arranged support frame and a strip-shaped fixed frame. The bottom of the support frame is movably abutted against the bottom guide rail. The fixed frame is arranged on the support frame and faces the road foundation. The push frame is arranged on the fixed frame. In construction step 5), during the drilling process of the drill rod and drill bit in the road foundation, the push frame moves along the fixed frame.
4. The method for constructing a pipe jacking system for road underpasses as described in claim 3, characterized in that, In construction step 2), the fixing frame has a guide groove arranged in strips. The guide groove passes through the front end of the fixing frame to form an opening facing the road foundation. The push frame is movably placed in the guide groove. The drill rod extends in the guide groove and passes through the opening, facing the road foundation. In construction step 3), after the steel pipe is fitted over the drill rod, the steel pipe is placed in the guide groove; in construction step 5), during the drilling of the road foundation, the pusher moves along the guide groove toward the road foundation, pushing the drill rod and steel pipe to move toward the road foundation synchronously.
5. The method for constructing a pipe jacking system for road underpasses as described in claim 3, characterized in that, In construction step 2), the rear end of the fixed frame is provided with a rear end plate, and the pushing frame is arranged at intervals with the rear end plate to form a pushing interval; a jack is set in the pushing interval, the rear end of the jack is fixedly abutted against the rear end plate, and the front end of the jack abuts against the pushing frame. In construction step 5), during the drilling of the road foundation, the jack pushes the pusher frame to move along the guide groove toward the road foundation.
6. The method for constructing a pipe jacking system for road underpasses as described in claim 1, characterized in that, In construction step 2), the drill bit is provided with a correction inclined wall. The rear end of the correction inclined wall penetrates the outer periphery of the drill bit, and the front end of the correction inclined wall penetrates the front end of the drill bit. The front end of the correction inclined wall extends forward to form an inclined plate. The inclined plate is formed in front of the drill bit and extends in the same direction as the correction inclined wall. The end of the inclined plate is pointed and is flush with the outer periphery of the drill bit. In construction step 5), during the drilling process of the drill rod and drill bit in the road foundation, the inclined plate rotates in the road foundation to extract soil from the road foundation. The extracted soil enters the pipe cavity through the front opening, flows along the spiral path, and is discharged through the rear opening.
7. The method for constructing a pipe jacking for a road underpass as described in claim 1, characterized in that, In construction step 5), after the steel pipe and drill rod have been drilled to a set length in the road foundation, a correction operation is performed on the steel pipe, including the following correction steps: 5.1) The drill rod stops rotating; 5.2) Measure the levelness of the steel pipe to determine its tilt direction; 5.3) By rotating the drill rod, adjust the tilt direction of the drill bit's tilting plate so that the tilt direction of the tilting plate is opposite to the tilt direction of the steel pipe; 5.4) Insert the inclined plate into the soil of the road foundation so that the inclined plate bears a pressure opposite to the inclination direction of the steel pipe; 5.5) Start the drill rod to rotate in the road foundation. The drill rod rotates away from the tilt direction of the steel pipe, and the steel pipe moves synchronously away from the tilt direction in the road foundation.
8. The method for constructing a pipe jacking system for road underpasses as described in claim 1, characterized in that, In construction step 5), when the steel pipe is inserted into the road foundation and the drill rod is withdrawn from the pipe cavity, the rear end opening of the steel pipe is sealed with a cover plate. The cover plate is provided with a rear end grouting hole, and the outer circumference of the steel pipe is provided with multiple outer circumference grout outlet holes. A quick-setting agent is injected into the outer circumference of the rear end opening. The quick-setting agent mixes with the soil to form a closed outer circumference ring, which surrounds the outer circumference of the rear end opening. Cement grout is injected into the pipe cavity under high pressure through the rear grouting hole. The cement grout fills the pipe cavity and is sprayed outward into the soil through multiple peripheral grout outlet holes in a splitting manner, where it combines with the soil.
9. The method for constructing a pipe jacking system for road underpasses as described in claim 1, characterized in that, In construction step 3), the cavity is provided with multiple spiral plates, which are arranged at intervals along the circumference of the cavity and spirally arranged along the axial direction of the cavity; the spiral plates are arranged opposite to the spiral channel, the inner end of the spiral plates is connected to the inner sidewall of the cavity, the outer end of the spiral plates is arranged towards the spiral channel, and the outer end of the spiral plates is provided with multiple spiral grooves arranged at intervals, which are spirally arranged in the same direction as the spiral plates; In construction step 5), during the synchronous drilling of the steel pipe and drill rod in the road foundation, the soil in the spiral channel moves spirally along the direction from the front opening to the rear opening, and the spiraling plate spirals and cuts the soil in the spiral channel so that the soil in the spiral channel is arranged in a scattered manner.
10. The method for constructing a pipe jacking for a road underpass as described in any one of claims 1-9, characterized in that, In construction step 3), along the direction from the inside to the outside of the spiral plate, the rear end of the spiral plate gradually narrows. The inner end of the spiral plate has inner edge on both sides. The inner edge is provided with an elastic strip. The elastic strip extends along the length direction of the inner edge and extends outward to form an elastic plate that is away from the spiral plate. The elastic plate covers the inner side of the tube cavity. In construction step 5), during the synchronous drilling of the steel pipe and drill rod in the road foundation, the soil in the spiral channel moves spirally along the direction from the front opening to the rear opening. The elastic strip and elastic sheet are squeezed and deformed, reducing the contact area between the soil and the spiral sheet, as well as reducing the contact area between the soil and the inner side of the pipe cavity.