A protection structure and construction method for shield-type excavated pipelines

Abstract

The present invention discloses a shield-type pipeline protection structure and a construction method thereof, the method comprising: nesting a soil cutter around the existing pipeline body to cut the soil. The soil cutter comprises: a cutter disc, a thrust device, an inner wall, an outer wall, and a tail disc; and a plurality of blades uniformly arranged around the outer periphery of the cutter disc and on the surface of the cutter disc. The scraper is fixed on the reinforcing rib, the circular blade is fixed on the cutter disc surface, and the roller is fixed by the reinforcing ribs on both sides. The thrust device is composed of a hydraulic rod combination and is fixed to the tail end of the soil cutter. Polytetrafluoroethylene and rubber with low friction are selected on the inner side of the inner wall. The outer wall is connected by bolts, and the bolts are distributed on both sides of the soil cutter. The thin-walled concrete protection structure is interspersed around the pipeline, the size of the thin-walled concrete corresponds to the size of the hole, and the left and right sides of the thin-walled concrete are connected by bolts. The scheme has simple construction, stable performance, long service life, small disturbance to the ground, and is suitable for urban roads that are not suitable for large-scale excavation. At the same time, it plays an effective protective role for pipelines whose direction cannot be determined.

Description

Technical Field

[0001] The present invention relates to the field of pipeline municipal protection, in particular to the field of pipeline protection where the pipeline burial depth is large, the surrounding environment is complex, and the pipeline direction is unclear. Background Art

[0002] At present, with the continuous development of social economy, more and more plastic pipes such as PE and PPR are used in the construction of underground pipe networks. The detector simply cannot detect the pipeline direction, which causes great trouble to underground excavation construction. At the same time, it also makes the underground pipelines have great potential safety hazards, and the risk of accidents caused by third-party damage to the pipelines is extremely high. The requirements of urban construction for the environment are also getting higher and higher. Large-area excavation of pipeline covering soil will cause urban road congestion and urban environmental pollution. Therefore, the requirements for pipeline protection technology are getting higher and higher.

[0003] The existing pipeline protection schemes generally involve excavating the covering soil above the pipeline, exposing the pipeline on the ground surface, passing through a series of protection structures, and finally filling the pipeline with covering soil. First of all, this construction method cannot determine the pipeline direction and will cause damage to the pipeline during the construction process. Secondly, large-area excavation of pipeline covering soil is difficult in construction, and at the same time, it will also cause certain urban environmental pollution and urban traffic congestion. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the first object of the present invention is to provide a shield-type pipeline excavation protection structure and construction method to solve the problem that the underground pipelines are easily damaged during excavation due to the inability to directly detect the pipeline direction in the prior art, and at the same time, to solve the urban traffic congestion and environmental pollution caused by large-area covering soil excavation.

[0005] To achieve the above object, the present invention provides a shield-type pipeline excavation protection structure. It includes the cutting machine: cutter head surface, thrust device, inner wall, outer wall, tail plate; a variety of cutter blades evenly arranged around the periphery of the cutter head and on the surface of the cutter head. The scraping cutter is fixed on the reinforcing rib, the circular cutter blade is fixed on the cutter head surface, and the hob distribution is fixed by two-sided reinforcing ribs. The thrust device is composed of a combination of hydraulic rods and is fixed at the tail end of the cutting machine. The inner side of the inner wall selects polytetrafluoroethylene and rubber with low friction. The outer wall is connected by bolts, and the bolts are distributed on both sides of the cutting machine. The thin-walled concrete protection structure is inserted around the pipeline, the size of the thin-walled concrete corresponds to the size of the hole, and the left and right sides of the thin-walled concrete are connected by bolts.

[0006] The present invention realizes the recycling of the device through the detachable cutting machine and thrust device.

[0007] The cutter head surface is composed of a variety of cutter heads combined, and is fixed by the reinforcing rib and the fixed disc, with a stable structure.

[0008] Furthermore, the inner wall is embedded with polytetrafluoroethylene and a rubber cushion layer, and bolt sockets are distributed on both sides of the outer wall.

[0009] Furthermore, the soil cutting machine is fixedly connected to the existing pipeline by bolts, and the cutter head surface is fixedly connected to the inner and outer walls by insertion or bolts.

[0010] Furthermore, the soil cutting machine and the thrust device are fixedly connected by bolts, and the structure is stable. This ensures that the soil cutting machine can cut the soil along the advancing direction of the pipeline.

[0011] Furthermore, the precast concrete thin wall is selected, and the size of the thin wall corresponds to the size of the hole. The precast concrete thin wall is fixedly connected to the existing pipeline by bolts.

[0012] According to the second aspect of the embodiments of the present invention, a construction method for a shield-type excavation pipeline protection structure:

[0013] Step S1: First, according to the requirements for excavating municipal buried pipelines, select a suitable pipeline excavation point, excavate the upper layer of soil covering the pipeline, and construct a construction step.

[0014] Step S2: After the excavation of the soil covering is completed, fix the soil cutting machine to the pipeline with bolts. After the inner wall and the outer wall are fixedly connected by bolts, insert the cutter head surface between the inner wall and the outer wall. After the cutter head is installed, fix the thrust device at the tail.

[0015] Step S3: Start the thrust device and the soil cutting machine, spray slurry to protect the wall while cutting the soil to make the hole structure stable. After cutting is completed, remove the miscellaneous soil at the hole opening.

[0016] Step S4: Fix the precast concrete thin wall to the existing pipeline with bolts and insert it into the hole along the existing pipeline. Fill the gap between the pipeline and the concrete thin wall with clay. After the construction is completed, backfill the construction location to ensure the ground surface is flat.

[0017] The embodiments of the present invention have the following advantages: The soil is cut according to the direction of the pipeline, which has a good protective effect on pipelines whose direction cannot be determined. There is no need for large-area excavation, which causes unnecessary traffic jams and environmental pollution, and greatly improves the construction efficiency. The precast concrete thin wall and the hole structure improve the stability of the pipeline enclosure structure and play a good protective role for the pipeline. Description of the Drawings

[0018] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary. For those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained based on the provided drawings.

[0019] The structures, proportions, sizes, etc. illustrated in this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention.

[0020] Figure 1 It is a schematic diagram of the thrust device of the soil cutting machine in this embodiment.

[0021] Figure 2 It is a schematic diagram of the cutter head surface in this embodiment.

[0022] Figure 3 It is a schematic diagram of the precast concrete thin wall in this embodiment.

[0023] Explanation of reference numerals: 1. Existing pipeline; 2. Outer wall; 3. Inner wall; 4. Bolt; 5. Cutter head surface; 6. Scraper; 7. Polytetrafluoroethylene and rubber cushion; 8. Fixed ring; 9. Circular blade; 10. Hob; 11. Reinforcing rib; 12. Rivet; 13. Hydraulic rod; 14. Concrete thin wall. Specific embodiments

[0024] The following will further elaborate on the present invention in conjunction with the accompanying drawings.

[0025] This example discloses a protection structure for shield - type excavation pipelines and its construction method, as Figure 1 :

[0026] As Figure 1 The soil cutting machine includes an inner wall 3 and an outer wall 2, and the inner wall and the outer wall are fixed on the existing pipeline 1 through bolts 4. The thrust device is composed of hydraulic rods 9 and is fixed at the tail with bolts.

[0027] As Figure 2The shown cutter head surface 5, multiple circular blades 9 evenly arranged around the periphery of the cutter head surface and on the surface of the cutter head, the hob 10 is fixedly arranged on the surface of the cutter barrel, the cutter head surface also fixes multiple scrapers 6, the reinforcing rib 11 is fixed on the cutter head surface through the fixed ring 8, and the outer surface interface is fixedly connected by rivets. A polytetrafluoroethylene cushion layer and a rubber cushion layer 7 with low friction are selected on the inner side of the inner wall 4.

[0028] As Figure 3 shown, the precast concrete thin wall 10, the size of the thin wall concrete corresponds to the size of the hole, and the left and right sides of the thin wall concrete are fixedly connected to the existing pipeline 1 by bolts.

[0029] The present invention realizes the recycling of the device through the detachable earth cutting machine and the thrust device.

[0030] According to the second aspect of the embodiment of the present invention, a construction method of a shield-type excavation pipeline protection structure:

[0031] Step S1, first select a suitable pipeline excavation point according to the requirements of municipal buried pipeline excavation, excavate the upper layer of soil covering the pipeline, and make a construction step.

[0032] Step S2, after the soil covering excavation is completed, fix the earth cutting machine on the pipeline with bolts. After the inner wall and the outer wall are fixedly connected by bolts, insert the cutter head surface between the inner wall and the outer wall. After the cutter head is installed, fix the thrust device at the tail.

[0033] Step S3, start the thrust device and the earth cutting machine, spray slurry to protect the wall while cutting the soil body to make the hole structure stable. After cutting, remove the miscellaneous soil at the hole opening.

[0034] Step S4, fix the precast concrete thin wall on the existing pipeline with bolts and insert it into the hole along the existing pipeline. The gap between the pipeline and the concrete thin wall is filled with clay. After the construction is completed, backfill the construction position to ensure the ground surface is flat.

[0035] Obviously, the above embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, rather than limitations on the specific implementation manners of the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the claims of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. Construction method of a protection structure for shield - type excavated pipelines. The protection structure mainly includes: (1) The earth cutting machine includes: A cutter head surface, an inner wall, and an outer wall; a variety of cutter blades evenly arranged around the periphery of the cutter head and on the surface of the cutter head; scraping blades are fixed on the reinforcing ribs, circular blades are fixed on the cutter head surface, and hob cutters are distributed and fixed by two - sided reinforcing ribs; polytetrafluoroethylene with low friction and rubber are selected for the inner side of the inner wall; the outer wall is connected by bolts, and the bolts are distributed on both sides of the earth - cutting machine; a concrete thin - wall protection structure is inserted around the pipeline, the size of the concrete thin - wall corresponds to the size of the hole, and the left and right sides of the concrete thin - wall are connected by bolts; (2) Thrust device: Composed of a combination of hydraulic rods and fixed to the tail end of the earth - cutting machine with bolts; The specific steps are as follows: Step S1: First, according to the requirements of municipal buried pipeline excavation, select a suitable pipeline excavation point, excavate the upper - layer soil covering the pipeline, make a construction step, and excavate to about 1 m below the bottom of the pipeline; Step S2: After the soil covering excavation is completed, fix the earth - cutting machine on the pipeline with bolts. After the inner wall and the outer wall are connected and fixed by bolts, insert the cutter head surface between the inner wall and the outer wall; after the cutter head is installed, fix the thrust device at the tail; Step S3: Start the thrust device and the earth - cutting machine, spray slurry to protect the wall while cutting the soil to make the hole structure stable, and remove the miscellaneous soil at the hole opening after cutting; Step S4: Fix the concrete thin - wall on the existing pipeline with bolts and insert it into the hole along the existing pipeline; fill the gap between the pipeline and the concrete thin - wall with clay, and backfill the construction position after the construction is completed to ensure the ground surface is flat.

2. The construction method of a protection structure for shield-excavated pipelines according to claim 1, characterized in that: This construction method only needs to excavate a small part of the soil covering above the pipeline, without large - area excavation, and is applicable to urban roads with high environmental requirements and pipelines with relatively deep burial depths.

3. The construction method of a protection structure for a shield - type excavated pipeline according to claim 1, characterized in that: There is no need to use a detector to detect the pipeline alignment.

4. The construction method of a protection structure for a shield-type excavated pipeline according to claim 1, characterized in that: The concrete thin - wall is a pre - cast concrete structure and its size corresponds to the hole, and the concrete thin - wall and the existing pipeline are fixed by bolts.

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