Slurry balance pipe jacking channel winter construction method based on severe cold area

Abstract

The invention relates to a winter construction method for a slurry balance pipe jacking channel based on a severe cold area, which comprises the following steps of: 1, enabling a pipe jacking machine to enter one end of an area in which a pipeline needs to be formed to enter a pipe joint mounting hole for forming a pipe joint; secondly, in the forming process of the pipe joint installation holes, the pipe joints are jacked into the pipe joint installation holes one by one through a horizontal jacking mechanism till all the pipe joints are installed, and in the pipe joint jacking process, the space between the pipe joints and the hole walls of the pipe joint installation holes is filled with lease reducing slurry for lease reducing; and heating liquid with set pressure is input through the heating liquid inlet of the pipe joint entering the pipe joint mounting hole so as to drive the outer pipe to rotate, finally, the heating liquid is output from the heating liquid outlet, and the heating liquid heats the rental reduction slurry in the process of flowing through the heating cavity so as to prevent the rental reduction slurry from being frozen on the outer pipe to interfere with jacking of the pipe joint. The pipe jacking construction method has the advantages that the pipe jacking slurry can be prevented from being frozen on the pipe joints, and the problem that existing pipe jacking construction cannot be carried out due to the fact that the pipe jacking construction is used up and frozen in winter is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of underground tunnel construction, and in particular to a winter construction method for a mud-water balanced pipe jacking tunnel in severely cold areas. Background Art

[0002] During construction projects, underground tunnels (including pipelines) require construction. Existing tunnel construction methods include shield tunneling, blasting, open-cut tunneling, and pipe jacking. Pipe jacking is a trenchless construction method, a technique for laying pipelines or tunnels without or with minimal excavation. Pipe jacking involves using the jacking force generated by jacking equipment within a working pit to overcome friction between the pipeline and the surrounding soil, pushing the pipeline into the soil according to the designed slope and removing the soil. After one pipe section is pushed into the soil, the second section is lowered and continues. The principle is to use the thrust of the main jacking cylinder and other components such as pipe and relay rooms to push the pipe section or tunnel boring machine (pipe jacking machine) from the launch well through the soil and hoist it into the receiving well. The pipeline follows the pipe jacking machine and is buried between the two pits. Pipe jacking is the optimal construction method when open-cut construction is impractical due to interfering structures on the ground and the tunnel is small (pipe jacking is not suitable for rock locations). There are the following shortcomings in pipe jacking construction: when constructing in winter in extremely cold areas, the rent-reducing slurry (which can be mud) used to reduce resistance is easily frozen and causes loss of fluidity, resulting in a sudden increase in jacking resistance, pipe jamming, or even inability to jack. Summary of the Invention

[0003] The present invention aims to provide a winter construction method for mud-water balance pipe jacking channels in severely cold regions, which can prevent the rent-reducing slurry from freezing on pipe joints, thereby solving the problem that the existing pipe jacking construction cannot be carried out in winter because the slurry is frozen.

[0004] The above technical problems are solved by the following technical solutions: a winter construction method for a mud-water balance jacking channel in a severely cold area, characterized in that it is completed by a jacking channel construction equipment; the jacking channel construction equipment includes a jacking machine, a horizontal jacking mechanism and a plurality of pipe sections that are sequentially connected together to form a channel, the pipe section includes an inner tube and a heat exchange outer tube that can be rotatably mounted on the inner tube, a heating chamber that is surrounded by the heat exchange outer tube and the heat exchange inner tube, the heating chamber is provided with a heating liquid inlet hole and a heating liquid outlet hole that pass through the inner circumference of the inner tube, the inner circumference of the outer tube is provided with a plurality of blades that extend radially along the circumference of the outer tube, the blades are evenly distributed along the circumference of the outer tube, the blades divide the heating chamber into a plurality of sealed chambers distributed along the circumference of the outer tube, when the liquid flows into the sealed chamber, the pressure generated at one end face of the sealed chamber along the circumference of the outer tube is less than the pressure generated at the other end face, the spacing between the heating liquid inlet hole and the heating liquid outlet hole along the circumference of the inner tube is L1, the length of the sealed chamber along the circumference of the inner tube is L2, L2<L1<2 L2; The specific construction process is as follows: First, the pipe jacking machine is placed into one end of the area where the pipeline needs to be formed to form a pipe segment installation hole for accommodating the pipe segment. Second, during the process of forming the pipe segment installation hole, the pipe segments are pushed into the pipe segment installation hole one by one through the horizontal jacking mechanism until all the pipe segments are installed. During the process of jacking the pipe segments, a rent-reducing slurry is injected between the pipe segment and the wall of the pipe segment installation hole. A heating liquid with a set pressure is input through the heating liquid inlet hole of the pipe segment entering the pipe segment installation hole to drive the outer pipe to rotate. Finally, the heating liquid is output from the heating liquid outlet hole. As the heating liquid flows through the heating chamber, the rent-reducing slurry is heated to prevent it from freezing on the outer pipe and interfering with the jacking of the pipe segment. This allows pipe jacking construction to be carried out even in low-temperature winter. The pipe segment will not be unable to be advanced due to freezing.

[0005] Preferably, one end surface of the sealing cavity along the circumference of the outer tube is a plane passing through the axis of the outer tube, and the other end surface is an inclined surface. A technical solution for driving the rotation by upper and lower pressure differences is provided.

[0006] Preferably, the outer peripheral surface of the outer tube is provided with a plurality of heat exchange fins distributed axially along the circumference of the outer tube, which can improve the effect of heating the rent reduction slurry to prevent freezing.

[0007] Preferably, a barb groove is formed between the heat exchange fin and the outer surface of the outer tube, and the barb groove is located at the rear end of the outer tube in the direction of rotation driven by the heating liquid, so as to more reliably ensure the reliability of the one-way driving of the outer tube when the heating liquid flows in.

[0008] Preferably, a sealing ring is further included. The body of the pipe jacking machine is provided with a reaming sleeve, the outer diameter of the reaming sleeve is larger than the outer diameter of the pipe segment, the outer diameter of the sealing end ring is larger than the outer diameter of the reaming sleeve, and the inner diameter is equal to the outer diameter of the pipe segment. The rear end of the pipe jacking machine is provided with a rent-reducing slurry input hole connected to the rear end face of the reaming sleeve. The sealing ring is pressed by the horizontal jacking mechanism on the inlet end of the pipe segment mounting hole to prevent the rent-reducing slurry from flowing out of the pipe segment mounting hole. This can compact the wall of the pipe segment mounting hole when the pipe jacking machine moves forward, thereby better preventing the rent-reducing slurry from spreading. The independent provision of the sealing end ring to prevent the rent-reducing slurry from flowing out can prevent the rent-reducing slurry from leaking during the process of adding pipe segments.

[0009] Preferably, the outlet end of the rent-reducing slurry input hole is located at the lower end of the reaming sleeve, which can more reliably prevent the pipe section from excessively sinking during the injection of the rent-reducing slurry.

[0010] Preferably, the front end surface of the reaming sleeve is a conical surface with a larger rear end and a smaller front end, so that the pipe jacking machine can be pushed forward more labor-savingly.

[0011] Preferably, the outer circumference of the front end of the pipe segment is provided with a small-diameter pipe segment, and the inner circumference of the rear end is provided with a large-diameter pipe segment. The rear end of the pipe jacking machine is provided with a connecting support ring. The horizontal jacking mechanism includes a mounting seat, a pressing ring for pressing on the end face of the pipe segment, and a plurality of hydraulic cylinders. One end of the hydraulic cylinder is connected to the mounting seat, and the other end presses on the rear end of the pressing ring. The outer circumference of the front end of the pressing ring is provided with a small-diameter pressing ring section. The small-diameter pipe segment of the pipe segment at the front end is inserted into the connecting support ring, and the large-diameter pipe segment of the pipe segment at the rear end is sleeved on the small-diameter pressing ring section. Between adjacent pipe segments, the small-diameter pipe segment of the rear pipe segment is inserted into the large-diameter pipe segment of the front pipe segment. This can conveniently maintain the pipe segments suspended and centered.

[0012] Preferably, a small-diameter section of the reaming sleeve is provided on the outer circumferential surface of the rear end of the reaming sleeve, the outer diameter of which is larger than the outer diameter of the pipe segment. A grouting port is provided in the rear end of the pipe jacking machine, and a plurality of grouting outlets are provided on the outer circumferential surface of the small-diameter section of the reaming sleeve, distributed along the circumference of the reaming sleeve. The grouting outlets are connected to the grouting port via an outlet channel. During advancement of the pipe jacking machine, waterproof slurry is injected from the grouting port and ejected from the grouting port. The ejected waterproof slurry solidifies on the wall of the pipe segment mounting hole to form a waterproof layer, and a grouting liquid storage chamber is formed between the waterproof layer and the pipe segment. This can more reliably prevent the grouting liquid from spreading.

[0013] Preferably, the inner tube is an insulating structure. In winter, there is geothermal heat underground, and the cold energy mainly comes from the air. This technical solution can better prevent the rent-reducing slurry from freezing.

[0014] The present invention has the following advantages: it can effectively prevent the rent-reduction slurry from freezing; it has a good effect in preventing the rent-reduction slurry from spreading, and has little obstruction during advancement. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the pipe jacking machine just entering the pipe jacking installation area; Figure 2 for Figure 1 A local enlarged schematic diagram of point A; Figure 3 This is a schematic diagram of two pipe sections installed; Figure 4 is a schematic diagram of the cross section of the pipe segment; Figure 5 for Figure 4 A local enlarged schematic diagram of point C; Figure 6 for Figure 3 A local enlarged schematic diagram of point D.

[0016] In the figure: pipe jacking machine 1, horizontal jacking mechanism 2, pipe segment 3, inner pipe 4, heat exchange outer pipe 5, heating chamber 6, heating liquid inlet hole 7, heating liquid outlet hole 8, blade 9, sealing chamber 10, rent reduction slurry 11, the distance between the heating liquid inlet hole and the heating liquid outlet hole along the circumference of the inner pipe is L1, the length of the sealing chamber along the circumference of the inner pipe is L2, the end surface of the sealing chamber along the circumference of the outer pipe is 12, and the end surface of the sealing chamber along the circumference of the outer pipe is 13, heat exchange plate 14, barb groove 15, sealing ring 16, reaming sleeve 17, front end face of reaming sleeve 18, small diameter section of reaming sleeve 19, grouting port 20, slurry outlet 21, outlet channel 22, rent reduction slurry input hole 23, small diameter section 2 of pipe joint, large diameter section of pipe joint 25, connecting support ring 26, mounting seat 27, pressing ring 28, hydraulic cylinder 29, small diameter section of pressing ring 30, waterproof layer 31. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] See also Figures 1 to 6A winter construction method for a mud-water balanced pipe jacking tunnel in severely cold regions is implemented using pipe jacking tunnel construction equipment. The pipe jacking tunnel construction equipment includes a pipe jacking machine 1, a horizontal jacking mechanism 2, and a plurality of pipe sections 3 that are sequentially connected together to form a tunnel. The pipe sections include an inner tube 4 and a heat exchange outer tube 5 that can be rotatably sleeved on the inner tube. A heating chamber 6 is formed between the heat exchange outer tube and the heat exchange inner tube and is wrapped around the outer surface of the inner tube. The inner tube is a heat-insulating structure. The heating chamber is provided with a heating liquid inlet hole 7 and a heating liquid outlet hole 8 that pass through the inner circumference of the inner tube. The inner circumference of the outer tube is provided with a plurality of blades 9 extending radially along the circumference of the outer tube. The blades are evenly distributed along the circumference of the outer tube. The blades divide the heating chamber into a plurality of sealed chambers 10 distributed along the circumference of the outer tube. When the liquid flows into the sealed chamber, the pressure generated at one end face of the sealed chamber along the circumference of the outer tube is less than the pressure generated at the other end face. The distance between the heating liquid inlet hole and the heating liquid outlet hole along the circumference of the inner tube is L1, and the length of the sealed chamber along the circumference of the inner tube is L2, L2<L1<2 L2; The specific construction process is: the first step is to make the pipe jacking machine enter one end of the area where the pipeline needs to be formed to form the pipe segment installation hole for accommodating the pipe segment; the second step is to push the pipe segments one by one into the pipe segment installation hole through the horizontal jacking mechanism during the formation of the pipe segment installation hole until all the pipe segments are installed. During the process of pushing the pipe segments, a rent-reducing slurry 11 for reducing rent is also injected between the pipe segment and the hole wall of the pipe segment installation hole; a heating liquid with a set pressure is input through the heating liquid inlet hole of the pipe segment entering the pipe segment installation hole to drive the outer pipe to rotate, and finally the heating liquid is output from the heating liquid outlet hole. The rent-reducing slurry is heated during the heating liquid flowing through the heating chamber to prevent the rent-reducing slurry from freezing on the outer pipe and interfering with the jacking of the pipe segment.

[0019] The sealing cavity has an end face 12 along the circumference of the outer tube at one end that is a plane passing through the axis of the outer tube, and an end face 13 at the other end that is an inclined surface. A plurality of heat exchange fins 14 extending axially along the circumference of the outer tube are provided on the outer circumference of the outer tube. Barb grooves 15 are formed between the heat exchange fins and the outer surface of the outer tube, and the barb grooves are located at the rear end of the outer tube in the direction of rotation driven by the heating liquid. A sealing ring 16 is also included, and a reaming sleeve 17 is provided on the body of the pipe jacking machine. The outer diameter of the reaming sleeve is larger than the outer diameter of the pipe section, and the outer diameter of the sealing end ring is larger than the outer diameter of the reaming sleeve, and the inner diameter is equal to the outer diameter of the pipe section. The front end face 18 of the reaming sleeve is a conical surface with a larger rear end and a smaller front end. The outer circumference of the rear end of the reaming sleeve is provided with a small diameter section 19 of the reaming sleeve. The outer diameter of the small diameter section of the reaming sleeve is larger than the outer diameter of the pipe joint. A grouting port 20 is provided in the rear end of the pipe jacking machine. The outer circumference of the small diameter section of the reaming sleeve is provided with a plurality of slurry outlets 21 distributed along the circumference of the reaming sleeve. The slurry outlets are connected to the grouting port through an outlet channel 22. During the advancement of the pipe jacking machine, waterproof slurry is injected from the grouting port and sprayed out from the slurry outlet. The sprayed waterproof slurry solidifies on the wall of the pipe joint installation hole to form a waterproof layer 31. A slurry storage cavity is formed between the waterproof layer and the pipe joint. The rear end of the pipe jacking machine is provided with a slurry input hole 23 connected to the rear end of the reaming sleeve. The sealing ring is pressed against the inlet end of the pipe joint installation hole by the horizontal jacking mechanism to prevent the slurry from flowing out of the pipe joint installation hole. The outlet end of the slurry input hole is located at the lower end of the reaming sleeve. A small-diameter pipe section 24 is provided on the outer circumferential surface of the front end of the pipe section, and a large-diameter pipe section 25 is provided on the inner circumferential surface of the rear end. A connecting support ring 26 is provided at the rear end of the pipe jacking machine. The horizontal jacking mechanism includes a mounting seat 27, a pressing ring 28 for pressing on the end face of the pipe section, and a plurality of hydraulic cylinders 29. One end of the hydraulic cylinder is connected to the mounting seat and the other end is pressed on the rear end of the pressing ring. A small-diameter pressing ring section 30 is provided on the outer circumferential surface of the front end of the pressing ring. The small-diameter pipe section of the pipe section at the front end is passed through the connecting support ring, and the large-diameter pipe section of the pipe section at the rear end is sleeved on the small-diameter pressing ring section. Between adjacent pipe sections, the small-diameter pipe section of the pipe section at the rear is passed through the large-diameter pipe section of the pipe section at the front.

[0020] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A winter construction method for mud-water balance pipe jacking tunnels in severe cold regions, characterized in that: It is completed by jacking channel construction equipment; the jacking channel construction equipment includes a jacking machine, a horizontal jacking mechanism and a plurality of pipe sections that are connected together in sequence to form a channel, the pipe section includes an inner pipe and a heat exchange outer pipe that can be rotatably mounted on the inner pipe, a heating chamber that is surrounded by the heat exchange outer pipe and the heat exchange inner pipe, the heating chamber is provided with a heating liquid inlet hole and a heating liquid outlet hole that pass through the inner circumference of the inner pipe, the inner circumference of the outer pipe is provided with a plurality of blades extending radially along the circumference of the outer pipe, the blades are evenly distributed along the circumference of the outer pipe, the blades divide the heating chamber into a plurality of sealed chambers distributed along the circumference of the outer pipe, when the liquid flow is input into the sealed chamber, the pressure generated at one end face of the sealed chamber along the circumference of the outer pipe is less than the pressure generated at the other end face, the spacing between the heating liquid inlet hole and the heating liquid outlet hole along the circumference of the inner pipe is L1, the length of the sealed chamber along the circumference of the inner pipe is L2, L2<L1<2 L2; The specific construction process is: the first step is to make the pipe jacking machine enter one end of the area where the pipeline needs to be formed to form the pipe segment installation hole for accommodating the pipe segment; the second step is to push the pipe segments one by one into the pipe segment installation hole through the horizontal jacking mechanism during the formation of the pipe segment installation hole until all the pipe segments are installed. During the process of pushing the pipe segments, a rent-reducing slurry is injected between the pipe segment and the hole wall of the pipe segment installation hole for reducing rent; a heating liquid with a set pressure is input through the heating liquid inlet hole of the pipe segment entering the pipe segment installation hole to drive the outer pipe to rotate, and finally the heating liquid is output from the heating liquid outlet hole. The rent-reducing slurry is heated during the process of the heating liquid flowing through the heating chamber to prevent the rent-reducing slurry from freezing on the outer pipe and interfering with the jacking of the pipe segment.

2. The winter construction method of mud-water balanced pipe jacking tunnel in severe cold areas according to claim 1 is characterized in that: One end surface of the sealing cavity along the circumference of the outer tube is a plane passing through the axis of the outer tube, and the other end surface is an inclined surface.

3. The winter construction method of mud-water balanced pipe jacking tunnel in severe cold areas according to claim 1 or 2, characterized in that: A plurality of heat exchange fins are provided on the outer peripheral surface of the outer tube and are distributed axially along the circumference of the outer tube.

4. The winter construction method of mud-water balanced pipe jacking tunnel in severe cold areas according to claim 3 is characterized in that: A barb groove is formed between the heat exchange plate and the outer surface of the outer tube, and the barb groove is located at the rear end of the outer tube in the rotation direction driven by the heating liquid.

5. The winter construction method of mud-water balanced pipe jacking tunnel in severe cold areas according to claim 1 or 2, characterized in that: It also includes a sealing ring. The body of the pipe jacking machine is provided with a reaming sleeve. The outer diameter of the reaming sleeve is larger than the outer diameter of the pipe segment. The outer diameter of the sealing end ring is larger than the outer diameter of the reaming sleeve and the inner diameter is equal to the outer diameter of the pipe segment. The rear end of the pipe jacking machine is provided with a rent reduction slurry input hole connected to the rear end surface of the reaming sleeve. The sealing ring is pressed by the horizontal jacking mechanism against the inlet end of the pipe segment installation hole to prevent the rent reduction slurry from flowing out of the pipe segment installation hole. This can compact the wall of the pipe segment installation hole when the pipe jacking machine moves forward, thereby better preventing the rent reduction slurry from spreading. The independent provision of the sealing end ring to prevent the rent reduction slurry from flowing out can prevent the rent reduction slurry from leaking during the process of adding pipe segments.

6. The winter construction method of mud-water balanced pipe jacking tunnel in severe cold regions according to claim 5 is characterized in that: The outlet end of the rent-reducing slurry input hole is located at the lower end of the reaming sleeve.

7. The winter construction method of mud-water balanced pipe jacking tunnel in severe cold regions according to claim 5 is characterized in that: The front end surface of the reaming sleeve is a conical surface with a larger rear end and a smaller front end.

8. The winter construction method of mud-water balanced pipe jacking tunnel in severe cold regions according to claim 5 is characterized in that: A small-diameter pipe section is provided on the outer circumferential surface of the front end of the pipe section, and a large-diameter pipe section is provided on the inner circumferential surface of the rear end. A connecting support ring is provided at the rear end of the pipe jacking machine. The horizontal jacking mechanism includes a mounting seat, a pressing ring for pressing on the end face of the pipe section, and a plurality of hydraulic cylinders. One end of the hydraulic cylinder is connected to the mounting seat, and the other end presses on the rear end of the pressing ring. A small-diameter pressing ring section is provided on the outer circumferential surface of the front end of the pressing ring. The small-diameter pipe section of the pipe section at the front end is inserted into the connecting support ring, and the large-diameter pipe section of the pipe section at the rear end is sleeved on the small-diameter pressing ring section. Between adjacent pipe sections, the small-diameter pipe section of the pipe section at the rear end is inserted into the large-diameter pipe section of the pipe section at the front end.

9. The winter construction method of mud-water balanced pipe jacking tunnel in severe cold regions according to claim 5 is characterized in that: A small-diameter section of the reaming sleeve is provided on the outer circumferential surface of the rear end of the reaming sleeve, and the outer diameter of the small-diameter section of the reaming sleeve is larger than the outer diameter of the pipe segment. A grouting port is provided in the rear end of the pipe jacking machine, and a plurality of slurry outlets distributed along the circumference of the reaming sleeve are provided on the outer circumferential surface of the small-diameter section of the reaming sleeve, and the slurry outlets are connected to the grouting port through an outlet channel. During the advancement of the pipe jacking machine, waterproof slurry is injected from the grouting port and sprayed out from the slurry outlet. The sprayed waterproof slurry solidifies on the wall of the pipe segment installation hole to form a waterproof layer, and a waterproof slurry storage cavity is formed between the waterproof layer and the pipe segment.

10. The winter construction method of mud-water balanced pipe jacking tunnel in severe cold regions according to claim 1 or 2, characterized in that: The inner tube is a heat-insulating structure.

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