Pipe roofing construction structure of road underpass channel

Abstract

The invention relates to the technical field of road underpass channels, and discloses a road underpass channel pipe roof construction structure which comprises a moving frame placed in a starting pit, a pushing frame and a steel pipe, a pipe cavity is formed in the steel pipe, a drill rod is arranged in the steel pipe in a penetrating mode, and an extension section is formed at the front end of the drill rod and connected with a drill bit; the rear end of the drill rod is connected with the drilling machine which is arranged on the pushing frame. The periphery of the drill rod is provided with a spiral channel defined by spiral arms, the front end of the spiral channel communicates with the front end opening, and the rear end of the spiral channel communicates with the rear end opening. The pushing frame pushes the steel pipe and the drill rod to horizontally move towards the road foundation, the drilling machine drives the drill rod to rotate, so that the drill bit drills in the road foundation, the drill rod and the steel pipe synchronously drill in the road foundation, and soil in the road foundation enters the spiral road through the front end opening and is discharged out of the rear end opening along the spiral road till the steel pipe penetrates into the road foundation. Forming a pipe curtain; by means of synchronous propelling and efficient soil body discharging, efficient construction of the road underpass channel pipe roofing is achieved.

Description

Technical Field

[0001] This invention relates to the technical field of road underpasses, and more specifically, to the construction structure of pipe jacking for road underpasses. Background Technology

[0002] Road underpass projects are widely used in urban transportation construction. They enable traffic flow to be separated at different height levels, effectively alleviating traffic congestion and improving road capacity.

[0003] Pipe jacking is a commonly used technique in the construction of road underpasses, and the rational design and optimization of its structure have a direct impact on the efficiency of pipe jacking construction.

[0004] In existing technologies, pipe jacking construction structures often adopt a step-by-step operation: first, drilling rigs drill holes, then steel pipes are installed one by one, and finally the soil is treated. Although this operation is technically mature, the installation of steel pipes and drill rods is separated, which can easily lead to multiple disassembly and assembly and process switching, thus prolonging the construction cycle. In addition, in traditional construction, soil is mostly removed manually or by simple suction equipment, which is inefficient and easily leaves residues, affecting subsequent construction.

[0005] In addition, because the drill rod and steel pipe are operated separately, additional positioning and adjustment are required, making it difficult to control the construction accuracy efficiently, which increases both cost and time. Summary of the Invention

[0006] The purpose of this invention is to provide a pipe jacking construction structure for road underpasses, aiming to solve the problem of low construction efficiency of pipe jacking for road underpasses in the prior art.

[0007] The present invention is implemented as follows: a pipe jacking construction structure for a road underpass includes a movable frame placed in the starting pit and facing the road foundation, the movable frame being equipped with a pusher frame that moves relative to or away from the road foundation; a steel pipe is provided on the movable frame, the steel pipe is arranged facing the road foundation, and the steel pipe has a through-cavity that extends from front to back, the through-cavity penetrating the front end of the steel pipe to form a front opening, and the through-cavity penetrating the rear end of the steel pipe to form a rear opening; A drill rod is inserted through the cavity. The front end of the drill rod extends into a front opening to form an extension section. The extension section is connected to a drill bit, which is located at the front end of the steel pipe. The rear end of the drill rod extends into a rear opening and is connected to a drilling rig. The drilling rig is mounted on a push frame, and the rear end of the drilling rig abuts against the push frame. The drill pipe is provided with a spiral arm on its outer periphery. The spiral arm is spirally arranged along the axis of the drill pipe. The spiral arm is arranged around the outer periphery of the drill pipe to form a spiral channel. The front end of the spiral channel is connected to the front opening, and the rear end of the spiral channel is connected to the rear opening. The pusher frame pushes the steel pipe and drill rod to move horizontally toward the road foundation. The drilling rig drives the drill rod to rotate so that the drill bit drills into the road foundation. The drill rod and steel pipe drill into the road foundation simultaneously. The soil in the road foundation enters the spiral channel through the front opening, and is discharged from the rear opening along the spiral channel until the steel pipe penetrates into the road foundation to form a pipe curtain.

[0008] Furthermore, the bottom of the starting pit is provided with a transverse guide rail for the lateral movement of the mobile frame. The transverse guide rail is arranged along the transverse extension of the road foundation, and the mobile frame is movably placed on the transverse guide rail.

[0009] Furthermore, the bottom of the launching pit is provided with a plurality of transverse guide rails, which are arranged in parallel at intervals; the movable frame has a plurality of longitudinally arranged support frames, which are arranged in sequence at intervals, and the support frames are correspondingly and movably abutted against the plurality of transverse guide rails.

[0010] Furthermore, the movable frame includes a fixed frame, the push frame is movably mounted on the fixed frame, and the steel pipe and drill rod are respectively placed on the fixed frame.

[0011] Furthermore, the fixing frame has a strip-shaped guide groove that extends 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 steel pipe and drill rod are respectively placed in the guide groove and extend through the opening, facing the road foundation.

[0012] Furthermore, the rear end of the fixed frame is provided with a rear end plate, and the push frame is arranged at intervals with the rear end plate to form a push interval; the push interval is provided with a jack, the rear end of the jack is fixedly abutted against the rear end plate, the front end of the jack abuts against the push frame, and the jack pushes the push frame to move in the guide groove.

[0013] Furthermore, the fixed frame has guide walls on both sides, the two guide walls are arranged facing each other, and the two guide walls enclose the guide groove; the push frame has side arms arranged in a bent manner on both sides, and the side arms move from top to bottom and abut against the guide walls. The bottom of the guide groove is provided with a strip groove, which extends along the length of the guide groove. The bottom of the push frame is provided with a guide rail, which is movably embedded in the strip groove. When the push frame moves along the fixed frame, the side arm moves relative to the guide wall, and the guide rail moves relative to the strip groove.

[0014] Furthermore, 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.

[0015] Furthermore, the cavity is provided with a plurality of 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 abutted against 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 a plurality of spaced spiral grooves, which are spirally arranged in the same direction as the spiral plates; During the synchronous drilling of the steel pipe and drill rod in the road foundation, the soil in the spiral channel moves in a spiraling motion from the front opening to the rear opening, and the spiraling blades perform spiral cutting on the soil in the spiral channel.

[0016] Furthermore, 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 ends of the spiral plate have inner edge edges on both sides. The inner edge edge is provided with an elastic strip, which extends along the length direction of the inner edge edge and extends outward to form an elastic plate opposite to the spiral plate. The elastic plate covers the inner side of the lumen.

[0017] Compared with existing technologies, the pipe jacking construction structure for road underpasses provided by this invention achieves synchronous advancement and rotary drilling of steel pipes and drill rods in the road foundation through the mechanical synergy of the moving frame and the pushing frame. Compared with step-by-step construction, it avoids multiple disassembly and assembly and process switching caused by separate operation of drill rods and steel pipes, thereby optimizing the construction process. This not only significantly shortens the construction cycle, but also eliminates the need for additional positioning adjustments of drill rods and steel pipes, ensuring the accuracy and efficiency of the construction process.

[0018] In addition, a spiral channel formed by a spiral arm is set around the drill pipe, which allows the soil generated during drilling to enter the spiral channel from the opening at the front end of the steel pipe and be smoothly discharged to the opening at the rear end of the steel pipe without the need for additional slag removal procedures or manual slag removal, thus improving the soil discharge efficiency. In this way, the efficient construction of the pipe curtain tunnel for the road underpass is achieved through synchronous advancement and efficient soil discharge. Attached Figure Description

[0019] Figure 1 This is a simplified structural diagram of the pipe jacking construction structure for road underpasses provided by the present invention; Figure 2This is a cross-sectional schematic diagram of the fixing frame and the pushing frame 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 a cross-sectional schematic diagram of the spiral plate provided by the present invention; In the diagram: road foundation 100, starting pit 101, transverse guide rail 102; 200 mobile frame, 201 push frame, 202 support frame, 203 drilling rig, 204 guide rail; Fixed frame 300, guide groove 301, rear end plate 302, jack 303, guide wall 304, side arm 305; Steel pipe 400, pipe lumen 401; Drill pipe 500, drill bit 501, extension section 502, correction inclined wall 503, inclined plate 504, swivel arm 505, swivel track 506; Spiral plate 600, spiral groove 601, elastic strip 602, elastic plate 603. Detailed Implementation

[0020] 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.

[0021] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0022] 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.

[0023] Reference Figure 1-5 The image shows a preferred embodiment of the present invention.

[0024] The underpass pipe jacking construction structure includes a movable frame 200 placed in the starting pit 101 and facing the road foundation 100. The movable frame 200 is equipped with a pusher frame 201 that moves relative to or away from the road foundation 100. A steel pipe 400 is mounted on the movable frame 200 and is arranged facing the road foundation 100. The steel pipe 400 has a through-hole 401 that extends from front to back. The through-hole 401 extends through the front end of the steel pipe 400 to form a front opening and through the rear end of the steel pipe 400 to form a rear opening. A drill rod 500 is inserted through the cavity 401. The front end of the drill rod 500 extends into a front opening to form an extension section 502. The extension section 502 is connected to a drill bit 501, which is located at the front end of the steel pipe 400. The rear end of the drill rod 500 extends into a rear opening and is connected to a drilling rig 203. The drilling rig 203 is mounted on a pusher frame 201, and the rear end of the drilling rig 203 abuts against the pusher frame 201. The drill pipe 500 is provided with a spiral arm 505 on its outer periphery. The spiral arm 505 is spirally arranged along the axial direction of the drill pipe 500. The spiral arm 505 is arranged around the outer periphery of the drill pipe 500 to form a spiral channel 506. The front end of the spiral channel 506 is connected to the front opening, and the rear end of the spiral channel 506 is connected to the rear opening. The pusher 201 pushes the steel pipe 400 and the drill rod 500 to move horizontally toward the road foundation 100. The drilling rig 203 drives the drill rod 500 to rotate so that the drill bit 501 drills into the road foundation 100. The drill rod 500 and the steel pipe 400 drill into the road foundation 100 simultaneously. The soil in the road foundation 100 enters the spiral channel 506 through the front opening, and is discharged from the rear opening along the spiral channel 506 until the steel pipe 400 penetrates into the road foundation 100 to form a pipe curtain.

[0025] The aforementioned underpass pipe jacking construction structure, through the mechanical synergy of the movable frame 200 and the pushing frame 201, achieves synchronous advancement and rotary drilling of the steel pipe 400 and the drill rod 500 within the road foundation 100. Compared to step-by-step construction, it avoids the multiple disassembly and assembly and process switching caused by separate operation of the drill rod 500 and the steel pipe 400, thereby optimizing the construction process. This not only significantly shortens the construction cycle but also eliminates the need for additional positioning adjustments to the drill rod 500 and the steel pipe 400, ensuring both accuracy and efficiency in the construction process.

[0026] In addition, a spiral channel 506 is formed by a spiral arm 505 around the drill rod 500, which allows the soil generated during drilling to enter the spiral channel 506 from the opening at the front end of the steel pipe 400 and be smoothly discharged along the spiral channel 506 to the opening at the rear end of the steel pipe 400 without the need for additional slag removal procedures or manual slag removal, thus improving the soil discharge efficiency. In this way, the efficient construction of the pipe jacking for the road underpass is achieved through synchronous advancement and efficient soil discharge.

[0027] In this embodiment, the bottom of the starting pit 101 is provided with a transverse guide rail 102 for the movable frame 200 to move laterally. The transverse guide rail 102 is arranged along the transverse extension of the road foundation 100, and the movable frame 200 is movably placed on the transverse guide rail 102.

[0028] This allows the mobile frame 200 to move flexibly laterally within the starting pit 101, facilitating alignment with different positions of the road foundation 100 and providing accurate directional guidance for the subsequent advancement of the steel pipe 400 and drill rod 500.

[0029] In construction projects where site conditions are limited and high precision is required, the horizontal guide rail 102 ensures accurate positioning of the mobile frame 200, while also improving construction efficiency, shortening the construction cycle, and reducing construction costs.

[0030] In this embodiment, the bottom of the starting pit 101 is provided with a plurality of transverse guide rails 102, which are arranged in parallel at intervals; the movable frame 200 has a plurality of longitudinally arranged support frames 202, which are arranged in sequence at intervals, and the plurality of support frames 202 are correspondingly and movably abutted against the plurality of transverse guide rails 102.

[0031] The stability and load-bearing capacity of the mobile frame 200 are enhanced by the cooperation of multiple transverse guide rails 102 and multiple support frames 202 of the mobile frame 200. This structural design can evenly distribute the weight of the mobile frame 200 and the equipment above it, reduce local pressure, avoid deformation or damage of the guide rails, and extend the service life of the guide rails. At the same time, it also provides reliable support for the smooth advancement of the steel pipe 400 and drill rod 500, ensuring the smooth progress of the construction process.

[0032] In this embodiment, the movable frame 200 includes a fixed frame 300, and a pusher frame 201 is movably mounted on the fixed frame 300. The steel pipe 400 and the drill rod 500 are respectively placed on the fixed frame 300. The fixed frame 300 provides a stable support platform for the steel pipe 400 and the drill rod 500, while the movable arrangement of the pusher frame 201 facilitates flexible adjustment of the position of the steel pipe 400 and the drill rod 500 according to construction needs.

[0033] During construction, operators can quickly and accurately position the steel pipe 400 and drill rod 500 to the optimal position based on the actual conditions of the road foundation 100, reducing rework caused by positional deviations, improving construction efficiency, and ensuring construction quality.

[0034] In this embodiment, the fixing frame 300 has a guide groove 301 arranged in a strip shape. The guide groove 301 passes through the front end of the fixing frame 300 to form an opening facing the road foundation 100. The push frame 201 is movably placed in the guide groove 301. The steel pipe 400 and the drill rod 500 are respectively placed in the guide groove 301 and pass through the opening, facing the road foundation 100.

[0035] The guide groove 301 provides a clear movement trajectory for the pusher frame 201, steel pipe 400 and drill rod 500, ensuring that they can advance stably along the predetermined direction, preventing the steel pipe 400 and drill rod 500 from deviating or twisting during the advancement process, ensuring the straightness and accuracy of construction, thereby improving construction efficiency and reducing construction risks.

[0036] In this embodiment, the rear end of the fixed frame 300 is provided with a rear end plate 302, and the push frame 201 is arranged at intervals with the rear end plate 302 to form a push interval; the push interval is provided with a jack 303, the rear end of the jack 303 is fixedly abutted against the rear end plate 302, and the front end of the jack 303 abuts against the push frame 201, and the jack 303 pushes the push frame 201 to move in the guide groove 301.

[0037] During the construction of the underpass, the jack 303 provides a power source for the pusher frame 201. Through the jacking action of the jack 303, the moving speed and position of the pusher frame 201 can be controlled, so as to achieve the smooth and uniform advancement of the steel pipe 400 and the drill rod 500, thereby improving construction efficiency. At the same time, it is also conducive to precise control during the construction process and ensures construction quality.

[0038] Moreover, the power source for the jack 303 can be a hydraulic system, which can be connected to external power equipment, such as an electro-hydraulic pump station, through oil pipes to achieve remote control and automated operation, thereby improving the convenience and efficiency of construction.

[0039] In this embodiment, the fixed frame 300 has guide walls 304 on both sides, the two guide walls 304 are arranged facing each other, and the two guide walls 304 enclose to form a guide groove 301; the push frame 201 has side arms 305 arranged in a bent manner on both sides, and the side arms 305 move from top to bottom and abut against the guide walls 304. The bottom of the guide groove 301 is provided with a strip groove, which extends along the length of the guide groove 301. The bottom of the push frame 201 is provided with a guide rail 204, which is movably embedded in the strip groove. When the push frame 201 moves along the fixed frame 300, the side arm 305 moves relative to the guide wall 304, and the guide rail 204 moves relative to the strip groove.

[0040] During construction, the cooperation between the side arm 305 and the guide wall 304, as well as the smooth sliding of the guide rail 204 in the strip groove, can effectively prevent the push frame 201 from shaking or deviating during movement, ensuring the straight-line advancement of the steel pipe 400 and the drill rod 500. Moreover, the dual guiding cooperation of the guide wall 304 and the strip groove further enhances the stability and accuracy of the push frame 201's movement.

[0041] In this embodiment, the drill bit 501 is provided with a correction inclined wall 503. The rear end of the correction inclined wall 503 penetrates the outer periphery of the drill bit 501, and the front end of the correction inclined wall 503 penetrates the front end of the drill bit 501. The front end of the correction inclined wall 503 extends forward to form an inclined plate 504. The inclined plate 504 is formed in front of the drill bit 501 and extends in the same direction as the correction inclined wall 503 at an inclination. The end of the inclined plate 504 is pointed and is flush with the outer periphery of the drill bit 501.

[0042] By setting up the correction inclined wall 503 and the inclined plate 504, an automatic correction function is provided for the drill bit 501 to drill in the road foundation 100. The pointed end of the inclined plate 504 can cut into the soil during drilling. In actual construction, the inclined plate 504 rotates synchronously with the drill bit 501 in the road foundation 100 to drill the soil in the road foundation 100. If the drill bit 501 deviates, the tilting direction of the inclined plate 504 of the drill bit 501 is adjusted so that the tilting direction of the inclined plate 504 is opposite to the tilting direction of the steel pipe 400. This causes the inclined plate 504 to bear pressure opposite to the tilting direction of the steel pipe 400, thereby generating a reaction force to correct the deviation and achieve automatic correction.

[0043] This reduces rework and adjustment time caused by drill bit 501 deviation, improves drilling accuracy and efficiency, and is especially advantageous in construction environments with complex geological conditions and uneven strata, effectively ensuring the quality and progress of pipe jacking construction.

[0044] In this embodiment, a plurality of spiral plates 600 are provided in the cavity 401. The plurality of spiral plates 600 are arranged at intervals along the circumference of the cavity 401 and spirally arranged along the axial direction of the cavity 401. The spiral plates 600 and the spiral channel 506 are arranged opposite to each other. The inner end of the spiral plate 600 is connected to the inner sidewall of the cavity 401, and the outer end of the spiral plate 600 is arranged facing the spiral channel 506. The outer end of the spiral plate 600 is provided with a plurality of spiral grooves 601 arranged at intervals. The plurality of spiral grooves 601 are spirally arranged in the same direction as the spiral plate 600. During the synchronous drilling of steel pipe 400 and drill rod 500 in road foundation 100, the soil in spiral channel 506 moves spirally from the front opening to the rear opening, and spiral blade 600 performs spiral cutting on the soil in spiral channel 506.

[0045] In this way, during the synchronous drilling process of steel pipe 400 and drill rod 500, the soil in the spiral channel 506 can be effectively spiraled, cut, and transported. This allows the soil generated during drilling to be uniformly cut into smaller particles and smoothly discharged along the spiral channel 506, avoiding blockage of soil in the pipe cavity 401. This advantage is even more obvious under construction conditions with high soil viscosity, which can effectively improve construction efficiency and reduce the risk of structural failure.

[0046] In this embodiment, along the direction from the inside to the outside of the spiral plate 600, the rear end of the spiral plate 600 gradually shrinks. The inner ends of the spiral plate 600 have inner edge edges on both sides. The inner edge is provided with an elastic strip 602. The elastic strip 602 extends along the length direction of the inner edge and extends outward to form an elastic plate 603 that is away from the spiral plate 600. The elastic plate 603 covers the inner side of the cavity 401.

[0047] As the soil moves along the spiral path 506, the deformation of the elastic strip 602 and the elastic sheet 603 creates a tiny gap between the soil and the spiral plate 600, reducing direct contact between the soil and the spiral plate 600. At the same time, the surfaces of the elastic strip 602 and the elastic sheet 603 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 602 and the elastic sheet 603, thus avoiding soil accumulation.

[0048] This not only improves soil removal efficiency but also reduces the risk of structural failures caused by 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 structural maintenance costs.

[0049] 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 pipe jacking construction structure for road underpasses, characterized in that, The device includes a movable frame placed in the starting pit and facing the road foundation, the movable frame having a pusher that moves relative to or away from the road foundation; the movable frame has a steel pipe arranged facing the road foundation, the steel pipe having a through-hole in the front and rear, the through-hole passing through the front end of the steel pipe to form a front opening, and the through-hole passing through the rear end of the steel pipe to form a rear opening. A drill rod is inserted through the cavity. The front end of the drill rod extends into a front opening to form an extension section. The extension section is connected to a drill bit, which is located at the front end of the steel pipe. The rear end of the drill rod extends into a rear opening and is connected to a drilling rig. The drilling rig is mounted on a push frame, and the rear end of the drilling rig abuts against the push frame. The drill pipe is provided with a spiral arm on its outer periphery. The spiral arm is arranged to spiral along the axis of the drill pipe. The spiral arm is arranged to form a spiral channel around the outer periphery of the drill pipe. The front end of the spiral channel is connected to the front opening and the rear end of the spiral channel is connected to the rear opening. The pusher frame pushes the steel pipe and drill rod to move horizontally toward the road foundation. The drilling rig drives the drill rod to rotate so that the drill bit drills into the road foundation. The drill rod and steel pipe drill into the road foundation simultaneously. The soil in the road foundation enters the spiral channel through the front opening, and is discharged from the rear opening along the spiral channel until the steel pipe penetrates into the road foundation to form a pipe curtain.

2. The pipe jacking construction structure for road underpasses as described in claim 1, characterized in that, The bottom of the starting pit is provided with a transverse guide rail for the lateral movement of the mobile frame. The transverse guide rail is arranged along the transverse extension of the road foundation, and the mobile frame is movably placed on the transverse guide rail.

3. The pipe jacking construction structure for road underpasses as described in claim 2, characterized in that, The bottom of the launching pit is provided with multiple transverse guide rails, which are arranged in parallel at intervals; the movable frame has multiple longitudinally arranged support frames, which are arranged in sequence at intervals, and the support frames are correspondingly and movably abutted against the multiple transverse guide rails.

4. The pipe jacking construction structure for road underpasses as described in any one of claims 1-3, characterized in that, The mobile frame includes a fixed frame, the push frame is movably mounted on the fixed frame, and the steel pipe and drill rod are respectively placed on the fixed frame.

5. The pipe jacking construction structure for road underpasses as described in claim 4, characterized in that, The fixing frame has a strip-shaped guide groove that 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 steel pipe and drill rod are respectively placed in the guide groove and pass through the opening, facing the road foundation.

6. The pipe jacking construction structure for road underpasses as described in claim 4, characterized in that, The fixed frame has a rear end plate at its rear end, and the push frame is arranged at intervals with the rear end plate to form a push interval; the push interval is equipped with a jack, the rear end of the jack is fixedly abutted against the rear end plate, the front end of the jack abuts against the push frame, and the jack pushes the push frame to move in the guide groove.

7. The pipe jacking construction structure for road underpasses as described in claim 4, characterized in that, The fixed frame has guide walls on both sides, and the two guide walls are arranged facing each other to form the guide groove; the push frame has side arms arranged in a bent manner on both sides, and the side arms move from top to bottom and abut against the guide walls. The bottom of the guide groove is provided with a strip groove, which extends along the length of the guide groove. The bottom of the push frame is provided with a guide rail, which is movably embedded in the strip groove. When the push frame moves along the fixed frame, the side arm moves relative to the guide wall, and the guide rail moves relative to the strip groove.

8. The pipe jacking construction structure for road underpasses as described in any one of claims 1-3, characterized in that, 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 and is inclined; the end of the inclined plate is pointed and is flush with the outer periphery of the drill bit.

9. The pipe jacking construction structure for road underpasses as described in any one of claims 1-3, characterized in that, The cavity is provided with a plurality of 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 a plurality of spiral grooves arranged at intervals, which are spirally arranged in the same direction as the spiral plates; During the synchronous drilling of the steel pipe and drill rod in the road foundation, the soil in the spiral channel moves spirally from the front opening to the rear opening, and the spiraling blades spiral and cut the soil in the spiral channel.

10. The pipe jacking construction structure for road underpasses as described in claim 9, characterized in that, 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 lumen.

Images