Tunnel face excavation method conflicting with existing waste pipelines

Abstract

The excavation method for the tunnel face conflicting with the existing abandoned pipeline comprises the following steps that S1, the conflicting position of the abandoned pipeline and a tunnel is confirmed, and the abandoned pipeline section conflicting with the tunnel face is marked as a conflicting section; s2, plugging the two ends of the conflict section; s3, the conflict section is filled with concrete; and S4, after the concrete is finally set and the conflict section becomes a solid pipe section, the tunnel face is excavated and penetrates through the solid pipe section. The concrete is injected into the waste pipeline, and after the concrete is finally set, the waste pipeline forms a solid whole, so that the bearing capacity of the waste pipeline is improved, and the risk of pipeline collapse during breaking is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building construction, in particular to a tunnel face excavation method conflicting with existing abandoned pipelines. BACKGROUND

[0002] At present, when the urban tunnel face is excavated, the surrounding environment is complex, and the face is easy to conflict with the original existing underground abandoned pipelines during excavation, especially when the pipeline diameter is large, and many abandoned pipelines are spliced by multiple pipe sections, and the splicing part is particularly fragile, and direct breaking may cause the pipeline to collapse, which is dangerous and easy to cause the face to be unstable, and cannot guarantee the safety of excavation. SUMMARY

[0003] The present application relates to the field of building construction, in particular to a tunnel face excavation method conflicting with existing abandoned pipelines.

[0004] The present application relates to the field of building construction, in particular to a tunnel face excavation method conflicting with existing abandoned pipelines.

[0005] S1, confirming the conflict position of the abandoned pipeline and the tunnel, marking the pipeline section conflicting with the tunnel face as a conflict section;

[0006] S2, blocking the two ends of the conflict section;

[0007] S3, filling the conflict section with concrete;

[0008] S4, after the concrete is finally cured, the tunnel face is excavated and passes through the solid pipe section.

[0009] Further improvement of the present application is that the abandoned pipeline is a water pipe, and when the conflict section is blocked, the end close to the upstream is blocked first, and then the other end of the conflict section is blocked after the accumulated water in the conflict section is pumped out.

[0010] Further improvement of the present application is that the specific steps of step S3 include:

[0011] S31, using a down-the-hole hammer to drill downward above the conflict section until it penetrates into the conflict section to form a pouring hole;

[0012] S32, providing a concrete pipe, inserting the concrete pipe into the pouring hole and extending into the conflict section, and pouring concrete into the conflict section through the concrete pipe.

[0013] A further improvement of the present invention is that, in performing step S31, a plurality of the pouring holes are spaced apart at the conflict section; and in performing step S32, a concrete pipe is inserted into each pouring hole, and the plurality of concrete pipes are poured simultaneously.

[0014] A further improvement of the present invention is that, in performing step S3, foamed concrete is used to fill the conflict section.

[0015] A further improvement of the present invention is that, after performing step S1 and before starting step S2, excavation is carried out from above the conflict section to both ends of the conflict section, and the area above the conflict section is broken up to create construction conditions for subsequent sealing construction.

[0016] A further improvement of the present invention is that multiple inspection wells are spaced apart on the conflict section of the abandoned pipeline. When performing step S2, the two outermost inspection wells are selected as the two ends of the conflict section, and the sealing construction is carried out from the inspection wells downwards.

[0017] A further improvement of the present invention is that, in performing step S2, a sealing wall is used to seal the conflict section, and a plurality of exhaust holes are provided on the sealing wall for discharging harmful gases from the conflict section.

[0018] A further improvement of the present invention is that, after the concrete has set, the collision section is first checked to see if it has been filled. If it has been filled, the tunnel face is then excavated and the solid pipe is passed through.

[0019] This invention provides a method for excavating tunnel faces that conflict with existing abandoned pipelines. By injecting concrete into the abandoned pipeline, the pipeline becomes a solid whole after the concrete has set, which increases the load-bearing capacity of the abandoned pipeline and reduces the risk of demolition. At the same time, injecting concrete into the pipeline can also expel toxic gases from the pipeline. Attached Figure Description

[0020] Fig. 1 This is a schematic diagram of the conflict section of the present invention;

[0021] Fig. 2 This is a schematic diagram of the present invention before concrete pouring;

[0022] Fig. 3 This is a schematic diagram of the concrete pouring process according to the present invention.

[0023] 1. Down-the-hole hammer; 2. Sealing wall; 3. Conflict zone; 4. Concrete. Detailed Implementation

[0024] like Figs. 1-3 As shown, the present invention discloses a construction method for existing abandoned pipelines at a tunnel face, comprising the following steps:

[0025] S1, confirming the conflict position of the abandoned pipeline and the tunnel, marking the segment of the abandoned pipeline conflicting with the tunnel face as a conflict segment 3;

[0026] S2, plugging the two ends of the conflict segment 3;

[0027] S3, filling the conflict segment 3 with concrete 4;

[0028] S4, after the conflict segment 3 becomes a solid pipe segment after the concrete 4 is finally cured, excavating the tunnel face and passing through the solid pipe segment.

[0029] Preferably, in the embodiment, the abandoned pipeline is a water pipe, and when plugging the conflict segment 3, the upstream end is plugged first, and then the other end of the conflict segment 3 is plugged after the accumulated water in the conflict segment 3 is pumped out, preventing the water in the upstream pipeline from flowing into the conflict segment 3 downstream by plugging the upstream segment first; and preventing the accumulated water from seeping into the concrete 4 during subsequent concrete pouring, affecting the strength of the concrete, by pumping out the accumulated water in the abandoned pipeline.

[0030] Preferably, as shown in the embodiment of Fig. 2 , Fig. 3 the specific steps of step S3 include:

[0031] S31, using a down-the-hole hammer 1 to drill downward above the conflict segment 3 until it penetrates into the conflict segment 3 to form a pouring hole;

[0032] S32, providing a concrete pipe, penetrating the concrete pipe into the pouring hole and extending into the conflict segment, and pouring concrete into the conflict segment through the concrete pipe.

[0033] Preferably, as shown in Fig. 2 , when step S31 is performed, multiple pouring holes are provided at intervals in the conflict segment 3; and when step S32 is performed, one concrete pipe is penetrated into each pouring hole, and multiple concrete pipes are poured synchronously, by providing multiple pouring holes to fill the conflict segment with concrete 4, reducing the free flowing distance of the concrete 4, and in the embodiment, a pouring hole is provided every 5m.

[0034] Preferably, in the embodiment, when step S3 is performed, the conflict segment 3 is filled with foam concrete, and by using foam concrete with better fluidity and filling properties, the filling quality is higher.

[0035] Preferably, in the first embodiment, the waste pipeline is not provided with an existing inspection well, after step S1 is performed and before step S2 is started, the upper part of the conflict section 3 is excavated and broken respectively to create construction conditions for subsequent plugging construction.

[0036] Preferably, in the second embodiment, a plurality of inspection wells are arranged on the conflict section 3 of the waste pipeline, when step S2 is performed, the outermost two inspection wells are selected as the two ends of the conflict section 3, and the plugging construction is performed downward from the inspection wells.

[0037] Preferably, when step S2 is performed, the conflict section 3 is plugged by the plugging wall 2, and a plurality of exhaust holes for exhausting harmful gas in the conflict section 3 are formed on the plugging wall 2.

[0038] Preferably, after the concrete is finally cured, whether the conflict section 3 is filled is detected, if it is filled, the tunnel face is excavated and the solid pipe is passed through to ensure the construction quality, in this embodiment, the advance geological prediction is used to detect the filling condition of the concrete 4.

[0039] The present application includes the following advantages:

[0040] 1. By pouring concrete into the waste pipeline, the part of the waste pipeline that conflicts with the tunnel face forms a solid pipe section, preventing the risk of collapse at the waste pipeline during subsequent breaking and excavation, and because many waste pipelines are composed of multiple pipeline sections, if the joint is located in the conflict section, it may cause the joint to break and cause pipeline collapse, therefore, by pouring concrete, the joint of the waste pipeline is prevented from breaking;

[0041] 2. By clamping exhaust holes on the plugging wall and pouring concrete into the conflict section, the concrete will expel the harmful gas in the conflict section, preventing the harmful gas from causing damage when the waste pipeline is broken.

[0042] 3. The accumulated water in the conflict section is discharged in advance, and the two ends of the conflict section are plugged to prevent the accumulated water in the waste pipeline from affecting subsequent construction.

[0043] Finally, it should be noted that: the above is only the preferred embodiment of the present application and is not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified or some technical features can be replaced by equivalents, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A method of excavating a tunnel face which conflicts with an existing abandoned pipeline, characterised in that, The method comprises the following steps: S1, confirming a conflict position of the abandoned pipeline and the tunnel, marking a section on the abandoned pipeline corresponding to the conflict position as a conflict section; S2, plugging both ends of the conflict section; S3, filling the conflict section with concrete; S4, after the concrete is finally cured and the conflict section becomes a solid pipe section, excavating the tunnel face and passing through the solid pipe section.

2. The method of excavating a tunnel face that conflicts with an existing abandoned pipeline of claim 1, wherein, The abandoned pipeline is a water pipeline, and when the conflict section is plugged, the end close to the upstream is plugged first, and then the other end of the conflict section is plugged after the accumulated water in the conflict section is pumped out.

3. The method of claim 1, wherein, The specific steps of step S3 comprise: S31, using a down-the-hole hammer to punch down above the conflict section until the down-the-hole hammer penetrates into the conflict section to form a pouring hole; S32, providing a concrete pipe, inserting the concrete pipe into the pouring hole and into the conflict section, and pouring concrete into the conflict section through the concrete pipe.

4. A method of excavating a tunnel face which conflicts with an existing abandoned pipeline as claimed in claim 3 wherein: When step S31 is performed, multiple pouring holes are spaced apart at the conflict section; when step S32 is performed, one concrete pipe is inserted into each pouring hole, and multiple concrete pipes are poured synchronously.

5. The method of claim 1, wherein, When step S3 is performed, the conflict section is filled with foam concrete.

6. The method of excavating a tunnel face that conflicts with an existing abandoned pipeline of claim 1, wherein, After step S1 is performed and before step S2 is started, the conflict section is excavated from above to both ends of the conflict section, and the top of the conflict section is broken to create construction conditions for subsequent plugging construction.

7. The method of claim 1, wherein, Multiple inspection wells are spaced apart on the conflict section of the abandoned pipeline, and when step S2 is performed, the two outermost inspection wells are selected as the two ends of the conflict section, and the plugging construction is performed downward from the inspection wells.

8. The method of claim 1, wherein, When step S2 is performed, the conflict section is plugged using a plugging wall, and multiple exhaust holes for exhausting harmful gases in the conflict section are formed on the plugging wall.

9. The method of claim 1, wherein, After the concrete is finally cured, whether the conflict section is filled is detected first, and if the conflict section is filled, the tunnel face is excavated and the solid pipe section is passed through.

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