阅读说明：本技术 一种大直径混凝土管道内衬纤维网格灌浆加固方法 (Method for grouting and reinforcing fiber grids of large-diameter concrete pipeline lining ) 是由 吴智深 汪昕 陶甲 贺卫东 于 2020-04-28 设计创作，主要内容包括：本发明公开一种大直径混凝土管道内衬纤维网格灌浆加固方法,包括如下步骤：对待加固损伤混凝土管道的内表面进行清理；向所述处理后的管道内表面安装纤维网格,并用装置将纤维网格临时固定；向所述安装好的纤维网格外侧安装防水面层,并用装置将防水面层临时固定；向所述铺设完纤维网格与防水面层间隙灌注砂浆；待砂浆养护完成,拆除所述防水面层固定装置,对面层露出的接缝进行焊接。充分发挥纤维网格、砂浆和防水面层的作用,采用本发明的方法既能显著提高结构承载能力,又能在结构表面形成有效防水层,同时无需开挖,施工迅速,对生产生活影响较小。(The invention discloses a large-diameter concrete pipeline lining fiber grid grouting reinforcement method, which comprises the following steps: cleaning the inner surface of the damaged concrete pipeline to be reinforced; installing fiber grids on the inner surface of the treated pipeline, and temporarily fixing the fiber grids by using a device; installing a waterproof surface layer on the outer side of the installed fiber grid, and temporarily fixing the waterproof surface layer by using a device; pouring mortar into the gap between the laid fiber grid and the waterproof surface layer; and after the mortar maintenance is finished, removing the waterproof surface layer fixing device, and welding the exposed joint of the surface layer. The method can obviously improve the bearing capacity of the structure, form an effective waterproof layer on the surface of the structure, simultaneously avoid excavation, ensure rapid construction and have less influence on life.)

1. A large-diameter concrete pipeline lining fiber grid grouting reinforcement method is characterized by comprising the following steps:

(1) cleaning the inner surface of a damaged concrete pipeline to be reinforced, wherein the pipeline is a circular pipeline with the diameter of more than 1m or other-shaped pipelines with the height of more than 1m and the width of more than 0.9 m;

(2) installing the cut fiber grids on the inner surface of the cleaned pipeline, and temporarily fixing the fiber grids;

(3) installing waterproof panels outside the fiber grids paved in the pipeline, temporarily fixing the waterproof panels by using a fixing device, splicing a plurality of waterproof panels into a waterproof surface layer covering the inner wall of the pipeline, and forming a gap between the waterproof surface layer and the inner wall of the pipeline;

(4) arranging a sealing ring at the end part of the pipeline construction section, wherein the sealing ring is positioned between the inner wall of the pipeline and the waterproof surface layer to seal a gap between the inner wall of the pipeline and the waterproof surface layer, and arranging a mortar injection hole and a mortar discharge hole on the sealing ring;

(5) injecting mortar into the gap between the waterproof surface layer and the inner wall of the pipeline through the mortar injection hole, and stopping grouting when the mortar flows out from the mortar discharge hole at a constant speed;

(6) and (4) after the mortar maintenance is finished, removing the fixing device of the waterproof panels in the step (3), welding the exposed joints between the waterproof panels, and connecting the waterproof panels into an integral waterproof surface layer.

2. The method for grouting reinforcement of fiber mesh in the lining of large-diameter concrete pipe according to claim 1, wherein the fiber mesh in step (2) is a mesh-like material made of fiber and resin by a molding process.

3. The method for grouting reinforcement of fiber mesh in the lining of large-diameter concrete pipes according to claim 2, wherein when the fiber mesh is short and the lap joint is adopted, the lap joint length is at least 200 mm.

4. The grouting reinforcement method for fiber grids in the lining of a large-diameter concrete pipeline according to claim 2, characterized in that steel nails with gaskets are used for temporarily fixing the fiber grids in the step (2);

every time the fiber grid is laid by 0.5-0.8 m, a steel nail with a gasket is driven into the surface of the structure and used for temporarily fixing the fiber grid, and the steel nail is close to a node of the fiber grid.

5. The method for grouting reinforcement of fiber mesh in the lining of large-diameter concrete pipes according to claim 4, wherein the gasket is a steel gasket or a plastic gasket, and the shape of the gasket is rectangular or circular.

6. The method for grouting and reinforcing the fiber mesh in the lining of the large-diameter concrete pipeline according to claim 1, wherein the waterproof panel in the step (3) is a high-density polyethylene panel, one surface of the panel, which faces the inner wall of the pipeline, is a protruding bonding surface, and the other surface of the panel is a smooth waterproof surface.

7. The method for grouting reinforcement of fiber mesh in the lining of large-diameter concrete pipe according to claim 6, wherein the fixing device for temporarily fixing the waterproof panels in step (3) is a plurality of arc-shaped frames, each waterproof panel is embedded in the corresponding frame, and the adjacent frames are connected by bolts.

8. The grouting reinforcement method for the fiber grids lined in the large-diameter concrete pipeline according to claim 1, wherein in the step (4), the sealing ring is a double-layer rubber sealing ring; the injection hole and the discharge hole are arranged at the top of the sealing ring.

9. The method for grouting reinforcement of fiber mesh in the lining of large-diameter concrete pipe according to claim 1, wherein the mortar in the step (5) is high-fluidity, high-strength and non-contractible ready-mixed mortar.

10. The grouting reinforcement method for the fiber mesh lining of the large-diameter concrete pipeline according to claim 1, wherein in the step (6), a high-density polyethylene welding rod made of the same material as the waterproof panel is adopted for seam welding.

Technical Field

The invention relates to the technical field of structural reinforcement, in particular to a damaged pipeline reinforcing method. The fiber mesh is particularly suitable for long-distance and large-diameter underground concrete damaged pipelines to improve the stress performance of the structure by using the fiber mesh, and the reinforcement and waterproof effects are realized.

Background

After the urban underground concrete pipeline system runs for a long time, due to factors such as design defects, severe environments, accidental disasters and the like, pipeline concrete cracks and damages, the working performance is gradually deteriorated, and serious economic loss is caused. To the above-mentioned damaged pipeline, need carry out effectual reinforcement and restoration to resume original bearing capacity, guarantee the normal working property of pipeline.

Common large-diameter pipeline reinforcing and repairing methods include a concrete-encased method, a sleeve grouting method, a fiber cloth-lined method and the like. Although these reinforcement methods can effectively improve the load-bearing capacity of the structure through the reinforcement design, each method has certain disadvantages. The outer concrete coating method needs excavation, and the local concrete pouring outside the pipeline can generate structural unevenness along the axial direction of the pipe, so that the stress of the pipeline is not facilitated. The sleeve grouting method has complex process and higher cost, greatly reduces the pipe diameter, and has difficult guarantee of long-term performance. The lining fiber cloth reinforcing method has low efficiency of improving the strength and the rigidity of the pipeline, long time consumption for large-area reinforcement, needs to paste fiber materials in multiple layers, has high requirements on the pasting process and directly influences the reinforcing effect.

Disclosure of Invention

The purpose of the invention is as follows: aiming at the defects of the prior art, the invention provides a non-excavation, low-cost, quick and efficient underground concrete pipeline reinforcing method, which ensures the long-term performance of the pipeline and reduces the influence on production and life.

The technical scheme is as follows: the invention relates to a method for reinforcing a large-diameter concrete pipeline lining fiber grid by grouting, which comprises the following steps:

(1) cleaning the inner surface of a damaged concrete pipeline to be reinforced, wherein the pipeline is a circular pipeline with the diameter of more than 1m or other-shaped pipelines with the height of more than 1m and the width of more than 0.9 m;

(2) installing the cut fiber grids on the inner surface of the cleaned pipeline, and temporarily fixing the fiber grids;

(3) installing waterproof panels outside the fiber grids paved in the pipeline, temporarily fixing the waterproof panels by using a fixing device, splicing a plurality of waterproof panels into a waterproof surface layer covering the inner wall of the pipeline, and forming a gap between the waterproof surface layer and the inner wall of the pipeline;

(4) arranging a sealing ring at the end part of the pipeline construction section, wherein the sealing ring is positioned between the inner wall of the pipeline and the waterproof surface layer to seal a gap between the inner wall of the pipeline and the waterproof surface layer, and arranging a mortar injection hole and a mortar discharge hole on the sealing ring;

(5) injecting mortar into the gap between the waterproof surface layer and the inner wall of the pipeline through the mortar injection hole, and stopping grouting when the mortar flows out from the mortar discharge hole at a constant speed;

(6) and (4) after the mortar maintenance is finished, removing the fixing device of the waterproof panels in the step (3), welding the exposed joints between the waterproof panels, and connecting the waterproof panels into an integral waterproof surface layer.

According to a further preferable technical scheme of the invention, in the step (2), the fiber mesh is a mesh-shaped material formed by molding the fibers and the resin.

Preferably, when the overlap is used with insufficient mesh length, the overlap length is at least 200 mm.

Preferably, the steel nails with gaskets are used for temporarily fixing the fiber grids in the step (2);

every time the fiber grid is laid by 0.5-0.8 m, a steel nail with a gasket is driven into the surface of the structure and used for temporarily fixing the fiber grid, and the steel nail is close to a node of the fiber grid.

Preferably, the gasket is a steel gasket or a plastic gasket, and is rectangular or circular in shape.

Preferably, the waterproof panel in step (3) is a high-density polyethylene panel, one surface of the panel facing the inner wall of the pipeline is a protruding bonding surface, and the other surface of the panel is a smooth waterproof surface.

Preferably, the fixing device for temporarily fixing the waterproof panels in step (3) is a plurality of arc-shaped frames, each waterproof panel is embedded into the corresponding frame, and adjacent frames are connected by bolts.

Preferably, the sealing ring in the step (4) is a double-layer rubber sealing ring; the injection hole and the discharge hole are arranged at the top of the sealing ring.

Preferably, the mortar in the step (5) is a high-fluidity, high-strength and non-shrinkable ready-mixed mortar.

Preferably, the seam welding in the step (6) adopts a high-density polyethylene welding rod made of the same material as the waterproof panel.

Has the advantages that: (1) according to the grouting reinforcement method for the fiber grids lined in the large-diameter concrete pipeline, disclosed by the invention, the functions of the fiber grids, mortar and a waterproof surface layer are fully exerted, the fiber grids are light and high in strength, the bearing capacity of the pipeline is effectively improved, the thickness of a reinforcement layer is reduced, and the transportation capacity of the pipeline is greatly improved; the waterproof surface layer has good water tightness, strong corrosion resistance and extremely high ductility, can ensure the long-term performance of the pipeline, avoids the waterproof process and improves the construction efficiency. The mortar can replace epoxy glue in the existing reinforcing method, has good bonding effect and simultaneously bears partial load, and the method can obviously improve the bearing capacity of the structure, form an effective waterproof layer on the surface of the structure, simultaneously avoid excavation, realize rapid construction and have small influence on life.

(2) The reinforcing material can be prefabricated in factories, can be installed on construction sites, has simple process, quick reinforcement and short construction period, and can quickly repair damaged pipelines.

(3) The fiber grid has excellent durability, high strength and good fatigue performance, and is stressed bidirectionally, so that the structural form can ensure that the stress distribution is more uniform, the stress concentration phenomenon is weakened, and the crack development is restrained bidirectionally; meanwhile, the fiber grids are used as reinforcing materials, fixation can be achieved through anchor bolts, epoxy glue is not used, the phenomenon that the lining fiber cloth reinforces the hollow drum is avoided, and construction quality is improved.

(4) The invention adopts the high-density polyethylene waterproof surface layer, ensures the long-term working performance of the reinforced pipeline, avoids the procedures of anticorrosion and waterproof treatment in the existing reinforcing method and greatly shortens the construction time; meanwhile, the ductility of the polyethylene surface layer is high, and the pipeline can still be guaranteed not to be damaged and leaked under the condition of large deformation.

(5) The thickness of the reinforcing layer is small, and the drainage performance of the pipeline is basically not influenced; in addition, the method adopted by the invention belongs to a non-excavation reinforcement mode, the ground traffic is not obstructed, the grouting material adopts special mortar, the hardening time is short, the strength is high, the time for water cut-off of the pipeline is reduced, and the influence on the production and the life is reduced; the repairing and reinforcing method has wide application range, can be used for repairing longer pipe sections, horizontal and vertical pipe sections, large-diameter pipe sections with different section shapes, and can also be used for repairing highway culverts.

Drawings

Figure 1 is a schematic view of a pipe to be reinforced,

figure 2 is a schematic view of a duct-mounted fiber mesh,

figure 3 is a schematic view of the waterproof surface layer of the pipeline installation,

figure 4 is a schematic view of a pipeline grouting,

figure 5 is a schematic view of the welding of the waterproof facing,

fig. 6 is a partial enlarged view of the structure of the lining fiber grid grouting reinforcement pipeline.

Wherein, the method comprises the steps of 1-pipeline, 2-structural crack, 3-fiber grid, 4-steel nail with gasket, 5-waterproof panel, 6-frame, 7-mortar and 8-welding seam.

Detailed Description

The technical solution of the present invention is described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the embodiments.