Squeezing and crushing grouting device for short pipe replacement construction

Abstract

The utility model relates to an extruding, crushing and grouting device for short pipe replacement construction. The extruding, crushing and grouting device is divided into a conical front section, an extruding middle section and a guide tail section, the front conical section moves forwards to extrude an original pipeline to form pipeline fragments, the middle extrusion section extrudes the pipeline fragments into a surrounding soil layer in the radial direction, and the short replacement pipe penetrates through the pipeline fragments forwards along with the tail guide section; a high-pressure grouting pipe, a low-pressure grouting pipe and a negative-pressure grout return pipe are arranged in the extrusion breaking grouting device, a high-pressure grouting hole is formed in the rear end of the middle extrusion section, the high-pressure grouting pipe is connected with the high-pressure grouting hole through an annular pipeline, a low-pressure grouting hole is formed in the front end of the middle extrusion section, and the low-pressure grouting pipe is connected with the low-pressure grouting hole through an annular pipeline. When the original pipeline is crushed and pressed into the replacement short pipe, cement grout is synchronously injected into the soil layer around the pipeline; a slurry return hole is formed in the conical front section, the negative pressure slurry return pipe is connected with the slurry return hole through an annular pipeline, a small amount of cement slurry flowing into the conical front section is pumped out through the negative pressure slurry return pipe, and the cement slurry is prevented from flowing into an original pipeline.

Description

Technical Field

[0001] The utility model relates to trenchless replacement construction of pipelines, in particular to an extrusion crushing and grouting device for short pipe replacement construction. Background Art

[0002] When carrying out trenchless replacement construction of pipelines, a conical extrusion crushing device is usually used to radially extrude and crush the original pipeline, and at the same time, a new pipeline is pushed in. This method does not require excavating a trench to remove the original pipeline from the ground, has a fast construction speed, and has little impact on ground activities. However, there are also some problems in this method during construction. After the original pipeline is damaged and leaks, the soil outside the pipeline is easily washed out and hollowed. After the new pipeline is pressed in, if these cavities are not blocked and backfilled, these pipeline segments are extremely prone to separation, further scouring and eroding the soil around the pipeline, resulting in difficulty in ensuring the operation cycle of the repaired pipeline. Content of the Utility Model

[0003] The purpose of the utility model is to propose an extrusion crushing and grouting device for short pipe replacement construction in view of the problem that the cavities on the periphery of the original pipeline cannot be backfilled during trenchless short pipe replacement construction, resulting in the disconnection of the replacement pipeline. To achieve the purpose, the utility model adopts the following technical solutions:

[0004] The extrusion crushing and grouting device for short pipe replacement construction involved in the utility model is divided into a conical front section, an extrusion middle section, and a guiding tail section. A towing rod is provided at the front end of the conical front section; the conical front section moves forward to extrude the original pipeline to form pipeline fragments, and the extrusion middle section radially squeezes the pipeline fragments into the surrounding soil layer, and the replacement short pipe follows the guiding tail section to move forward through the pipeline fragments; a high-pressure grouting pipe, a low-pressure grouting pipe, and a negative-pressure slurry return pipe are arranged in the extrusion crushing and grouting device. A high-pressure grouting hole is provided at the rear end of the extrusion middle section, and the high-pressure grouting pipe is connected to the high-pressure grouting hole through an annular pipeline. A low-pressure grouting hole is provided at the front end of the extrusion middle section, and the low-pressure grouting pipe is connected to the low-pressure grouting hole through an annular pipeline. A slurry return hole is provided on the conical front section, and the negative-pressure slurry return pipe is connected to the slurry return hole through an annular pipeline. The high-pressure grouting pipe, the low-pressure grouting pipe, and the negative-pressure slurry return pipe pass through the conical front section and are respectively connected to a high-pressure grouting pump, a low-pressure grouting pump, and a negative-pressure slurry extraction pump.

[0005] Preferably, the high-pressure grouting hole and the low-pressure grouting hole are arranged obliquely towards the tail section to ensure that the injected cement slurry flows backward into the soil layer on the periphery of the replacement short pipe, and to avoid the cement slurry flowing forward into the original pipeline.

[0006] Preferably, a slurry collecting groove is provided on the conical front section. The slurry collecting groove is arranged circumferentially along the conical front section. The slurry return hole is located in the slurry collecting groove. The cement slurry flowing forward enters the negative-pressure slurry return pipe through the slurry collecting groove and the slurry return hole and is pumped out, so as to avoid the cement slurry flowing into the original pipeline.

[0007] Adopting the technical solution provided by the present utility model, compared with the prior art, it has the following beneficial effects:

[0008] 1. The extrusion crushing device is integrated with a grouting pipeline. During the process of crushing the original pipeline and pressing in the replacement short pipe, cement slurry is simultaneously injected into the soil layer around the pipeline to fill the gap between the pipeline and the soil layer, thereby extending the pipeline operation cycle.

[0009] 2. The grouting holes on the extrusion crushing device are obliquely arranged towards the tail section, preventing the injected cement slurry from flowing needlessly in the soil layer and entering the original pipeline through the conical front section of the extrusion crushing device, thus affecting the grouting effect.

[0010] 3. The conical front section of the extrusion crushing device is provided with a slurry collecting tank and a slurry return hole. A small amount of cement slurry flowing into the conical front section enters the negative pressure slurry return pipe through the slurry collecting tank and the slurry return hole and is pumped out, preventing the cement slurry from flowing into the original pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic structural diagram of the reaming grouting device;

[0012] Figure 2 is a schematic cross-sectional view of the grouting pipeline arrangement ( Figure 1 section A-A in);

[0013] Figure 3 is a schematic diagram of the short pipe replacement reaming grouting construction.

[0014] In the figure, the markings are: 11 - towing rod, 12 - conical front section, 13 - extrusion middle section, 14 - guiding tail section, 21 - high-pressure grouting pipe, 22 - low-pressure grouting pipe, 23 - negative pressure slurry return pipe, 24 - annular pipeline, 25 - high-pressure grouting hole, 26 - low-pressure grouting hole, 27 - slurry return hole, 28 - slurry collecting tank, 31 - original pipeline, 32 - pipeline fragments, 33 - replacement short pipe, 41 - soil layer, 42 - cement slurry. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] To deepen the understanding of the present utility model, the following will refer to the attached Figure 1 to Figure 3 and make a detailed description of the embodiments of the present utility model. The following embodiments are implemented on the premise of the technical solution of the present utility model, and the detailed implementation manners are given, but the protection scope of the present utility model is not limited to the following embodiments.

[0016] As shown in the attached Figure 1As shown in the figure, the extrusion crushing grouting device for short pipe replacement construction involved in the present utility model is divided into a conical front section 12, an extrusion middle section 13, and a guiding tail section 14. A towing rod 11 is provided at the front end of the conical front section 12; inside the extrusion crushing grouting device, there are a high-pressure grouting pipe 21, a low-pressure grouting pipe 22, and a negative-pressure slurry return pipe 23. A high-pressure grouting hole 25 is provided at the rear end of the extrusion middle section 23, and the high-pressure grouting pipe 21 is connected to the high-pressure grouting hole 25 through an annular pipeline 24, as shown in the appendix Figure 2 As shown; a low-pressure grouting hole 26 is provided at the front end of the extrusion middle section 13, and the low-pressure grouting pipe 22 is connected to the low-pressure grouting hole 26 through an annular pipeline 24; a slurry return hole 27 is provided on the conical front section 12, and the negative-pressure slurry return pipe 23 is connected to the slurry return hole 27 through an annular pipeline 24; the high-pressure grouting pipe 21, the low-pressure grouting pipe 22, and the negative-pressure slurry return pipe 23 pass through the conical front section 12 and are respectively connected to a high-pressure grouting pump, a low-pressure grouting pump, and a negative-pressure slurry suction pump.

[0017] The high-pressure grouting hole 25 and the low-pressure grouting hole 26 are arranged obliquely towards the tail section to ensure that the injected cement slurry 42 flows backward into the soil layer on the circumferential side of the replacement short pipe 33, and to prevent the cement slurry 42 from flowing forward into the original pipeline 31. A slurry collecting groove 28 is provided on the conical front section 12. The slurry collecting groove 28 is arranged circumferentially along the conical front section 12, and the slurry return hole 27 is located in the slurry collecting groove 28. The cement slurry 42 flowing forward enters the negative-pressure slurry return pipe 23 through the slurry collecting groove 28 and the slurry return hole 27 and is pumped out, thereby preventing the cement slurry 42 from flowing into the original pipeline 31.

[0018] As shown in the appendix Figure 3 As shown, the extrusion crushing device is pulled forward by the towing rod 11. When the conical front section 12 moves forward, it extrudes the original pipeline 31 to form pipeline fragments 32. The extrusion middle section 13 radially squeezes the pipeline fragments 32 into the surrounding soil layer 41, and the replacement short pipe 33 follows the guiding tail section 14 and moves forward through the pipeline fragments 32; during the process of crushing the original pipeline and pressing it into the replacement short pipe 33, cement slurry 42 is simultaneously injected into the soil layer 41 around the pipeline through the high-pressure grouting pipe 21 and the low-pressure grouting pipe 22, and the negative-pressure slurry suction pump is turned on to pump out a small amount of the cement slurry 42 flowing into the conical front section 12 through the slurry collecting groove 28, the slurry return hole 27, and the negative-pressure slurry return pipe 23.

[0019] The present utility model has been described in detail above in combination with the embodiments, but the above content is only the preferred embodiment of the present utility model and cannot be considered as limiting the implementation scope of the present utility model. All equivalent changes and improvements made according to the scope of the application of the present utility model should still fall within the scope covered by the patent of the present utility model.

Claims

1. Short pipe replacement construction extrusion crushing grouting device. The extrusion crushing grouting device is divided into a conical front section (12), an extrusion middle section (13), and a guiding tail section (14). A towing rod (11) is provided at the front end of the conical front section (12); the conical front section (12) moves forward to extrude the original pipeline (31) to form pipeline fragments (32), and the extrusion middle section (13) radially squeezes the pipeline fragments (32) into the surrounding soil layer (41). The replacement short pipe (33) follows the guiding tail section (14) and moves forward through the pipeline fragments (32); it is characterized in that, The extrusion and crushing grouting device is internally provided with a high-pressure grouting pipe (21), a low-pressure grouting pipe (22), and a negative-pressure slurry return pipe (23). A high-pressure grouting hole (25) is provided at the rear end of the extrusion middle section (13). The high-pressure grouting pipe (21) is connected to the high-pressure grouting hole (25) through an annular pipeline (24). A low-pressure grouting hole (26) is provided at the front end of the extrusion middle section (13). The low-pressure grouting pipe (22) is connected to the low-pressure grouting hole (26) through the annular pipeline (24). A slurry return hole (27) is provided on the conical front section (12). The negative-pressure slurry return pipe (23) is connected to the slurry return hole (27) through the annular pipeline (24). The high-pressure grouting pipe (21), the low-pressure grouting pipe (22), and the negative-pressure slurry return pipe (23) pass through the conical front section (12) and are respectively connected to a high-pressure grouting pump, a low-pressure grouting pump, and a negative-pressure slurry extraction pump.

2. The extrusion crushing grouting device for short pipe replacement construction according to claim 1, characterized in that, The high-pressure grouting hole (25) and the low-pressure grouting hole (26) are obliquely arranged towards the tail section.

3. The extrusion crushing grouting device for short pipe replacement construction according to claim 1, characterized in that, A slurry collecting groove (28) is provided on the conical front section (12). The slurry collecting groove (28) is arranged circumferentially along the conical front section (12), and the slurry return hole (27) is located in the slurry collecting groove (28).

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