Repair method for large cross-section culvert

Abstract

The present invention provides a method for repairing large-section culverts, belonging to the technical field of culvert repair, which includes the following steps: cleaning the inner wall of the culvert, and a plurality of positioning holes are penetrated and opened at preset positions of the geogrid mat. In the culvert, a plurality of support plates are sequentially pressed against the corresponding inner sides of the geogrid mat, and a plurality of support rods on the support plates are inserted and matched with the corresponding positioning holes, and the plurality of support rods are abutted against the inner wall of the culvert. Connect and fix two adjacent support plates to unfold the geogrid mat along the inner wall of the culvert; connect and fix the two side edges of two adjacent geogrid mats along the length direction of the culvert. Pour concrete between the geogrid mat and the inner wall of the culvert, and after the concrete is formed and cured, disassemble the support plates; coat an anticorrosive material on the inner side surface of the geogrid mat, and block the positioning holes with the anticorrosive material. The support platform formed in the method for repairing large-section culverts provided by the present invention can provide sufficient operating space and improve the overall construction efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of culvert repair, and more specifically, it relates to a method for repairing large-section culverts. Background Art

[0002] Local collapse, damage and other phenomena may occur in underground channels after long-term use. At this time, in order to ensure the normal operation of the underground channels, it is necessary to repair the damaged parts of the channels. By using a geogrid with anchor bolts for repair, since concrete needs to be poured between the geogrid and the culvert, it is necessary to support the formwork during the pouring and curing of the concrete, which results in a smaller operating space inside the entire culvert and lower construction efficiency. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for repairing large-section culverts, aiming to solve the problem of the smaller operating space inside the culvert, which leads to lower construction efficiency.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is: providing a method for repairing large-section culverts, including:

[0005] Clean the inner wall of the culvert, and a plurality of positioning holes are penetrated and opened at preset positions on the geogrid;

[0006] In the culvert, press a plurality of support plates against the corresponding inner sides of the geogrid in sequence. A plurality of support rods on the support plates are inserted and matched with the corresponding positioning holes, and the plurality of support rods are abutted against the inner wall of the culvert;

[0007] Connect and fix two adjacent support plates to unfold the geogrid along the inner wall of the culvert; connect and fix the two side edges of two adjacent geogrids along the length direction of the culvert;

[0008] Pour concrete between the geogrid and the inner wall of the culvert. After the concrete is formed and cured, disassemble the support plates; coat an anticorrosive material on the inner side of the geogrid, and block the positioning holes with the anticorrosive material.

[0009] As another embodiment of the present application, the step of penetrating and opening a plurality of positioning holes at preset positions on the geogrid includes:

[0010] According to the size of the inner wall of the culvert and the preset thickness of the concrete, weld the structure of a single geogrid and make a closed-loop geogrid with corresponding dimensions;

[0011] According to the positional relationship of the plurality of support rods on the support plate, a plurality of corresponding positioning holes are opened along the circumferential direction of the geogrid.

[0012] As another embodiment of the present application, before successively pressing a plurality of support plates against the corresponding inner sides of the geogrid mat within the culvert, the following steps are further included:

[0013] Coat glue for bonding with the geogrid mat at multiple position points on the support plate;

[0014] Coat a release agent on a plurality of the support rods.

[0015] As another embodiment of the present application, connecting and fixing two adjacent support plates includes:

[0016] Insert a connecting rod into the fixing tubes of two adjacent support plates, so that a plurality of support plates form a support structure arranged inside the geogrid mat.

[0017] As another embodiment of the present application, connecting and fixing the two side edges of two adjacent geogrid mats along the length direction of the culvert includes:

[0018] Place an annular washer between two adjacent geogrid mats, so that the outer peripheral surface of the annular washer fits against the culvert; connect the two adjacent side edges of the two geogrid mats to the inner peripheral surface of the annular washer.

[0019] As another embodiment of the present application, connecting the two adjacent side edges of the two geogrid mats to the inner peripheral surface of the annular washer includes:

[0020] Cut and align the two adjacent side edges of the two geogrid mats, and connect and fix the geogrid mat and the annular washer through a plurality of expansion bolts fixed on the inner wall of the culvert.

[0021] As another embodiment of the present application, connecting and fixing the geogrid mat and the annular washer through a plurality of expansion bolts fixed on the inner wall of the culvert includes:

[0022] Drill a plurality of fixing holes penetrating into the culvert at intervals along the length direction of the annular washer, place the expansion bolts correspondingly in the plurality of fixing holes, and rotate the nuts at the ends of the expansion bolts to press the geogrid mat against the annular washer.

[0023] As another embodiment of the present application, disassembling the support plate; coating an anticorrosive material on the inner side surface of the geogrid mat and plugging the positioning holes with the anticorrosive material includes:

[0024] Successively remove the support plates along the length direction of the culvert, and squeeze the anticorrosive material into the positioning holes.

[0025] The beneficial effects of the large-section culvert repair method provided by the present invention are as follows: Compared with the prior art, in the large-section culvert repair method of the present invention, the inner wall of the culvert is cleaned, and a plurality of positioning holes are penetrated and opened at preset positions of the geogrid mat. Inside the culvert, a plurality of support plates are sequentially press-fitted on the corresponding inner sides of the geogrid mat, and a plurality of support rods on the support plates are inserted and matched with the corresponding positioning holes, and the plurality of support rods are abutted against the inner wall of the culvert. The adjacent two support plates are connected and fixed to unfold the geogrid mat along the inner wall of the culvert; the two side edges of the adjacent two geogrid mats are connected and fixed along the length direction of the culvert. Concrete is poured between the geogrid mat and the inner wall of the culvert. After the concrete is formed and cured, the support plates are disassembled; an anticorrosive material is coated on the inner side surface of the geogrid mat, and the positioning holes are blocked by the anticorrosive material.

[0026] In this application, by arranging a plurality of support rods on the side surfaces of a plurality of support plates, and the support rods are inserted and matched with the positioning holes and abutted against the inner wall of the culvert. After the adjacent two support plates are connected and fixed, a support platform is formed inside, avoiding trampling on the geogrid mat and damage to the structure, and the installation is convenient. The formed support platform can provide sufficient operating space and improve the overall construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1 It is a flowchart of the large-section culvert repair method provided by the embodiment of the present invention;

[0029] Figure 2 It is a connection schematic diagram of the geogrid mat and the support plate after pouring concrete provided by the embodiment of the present invention;

[0030] Figure 3 For Figure 2 a partial enlarged view of part A in

[0031] Figure 4 It is a connection schematic diagram of the geogrid mat and the concrete after coating the anticorrosive layer provided by the embodiment of the present invention;

[0032] Figure 5 It is a connection schematic diagram of the geogrid mat and the expansion bolt provided by the embodiment of the present invention.

[0033] In the figure: 1. Culvert; 2. Concrete; 3. Support rod; 4. Geogrid mat; 5. Support plate; 6. Connecting rod; 7. Anchor rivet; 8. Anticorrosion layer; 9. Expansion bolt; 10. Annular washer. Detailed implementation mode

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] Please refer to Figure 1 and Figure 3 , and now the large-section culvert repair method provided by the present invention will be described. The large-section culvert repair method includes the following steps:

[0036] Clean the inner wall of the culvert 1, and a plurality of positioning holes are penetrated and opened at the preset positions of the geogrid mat 4.

[0037] In the culvert 1, a plurality of support plates 5 are sequentially pressed against the corresponding inner sides of the geogrid mat 4. A plurality of support rods 3 on the support plate 5 are inserted and matched with the corresponding positioning holes, and the plurality of support rods 3 are abutted against the inner wall of the culvert 1.

[0038] Connect and fix two adjacent support plates 5 to unfold the geogrid mat 4 along the inner wall of the culvert 1; connect and fix the two side edges of two adjacent geogrid mats 4 along the length direction of the culvert 1.

[0039] Pour concrete 2 between the geogrid mat 4 and the inner wall of the culvert 1. After the concrete 2 is formed and cured, disassemble the support plate 5; coat the inner side surface of the geogrid mat 4 with anticorrosion material, and block the positioning holes with the anticorrosion material.

[0040] The beneficial effect of the large-section culvert repair method provided by the present invention is that: compared with the prior art, in the large-section culvert repair method of the present invention, the inner wall of the culvert 1 is cleaned, and a plurality of positioning holes are penetrated and opened at the preset positions of the geogrid mat 4. In the culvert 1, a plurality of support plates 5 are sequentially pressed against the corresponding inner sides of the geogrid mat 4. A plurality of support rods 3 on the support plate 5 are inserted and matched with the corresponding positioning holes, and the plurality of support rods 3 are abutted against the inner wall of the culvert 1. Connect and fix two adjacent support plates 5 to unfold the geogrid mat 4 along the inner wall of the culvert 1; connect and fix the two side edges of two adjacent geogrid mats 4 along the length direction of the culvert 1. Pour concrete 2 between the geogrid mat 4 and the inner wall of the culvert 1. After the concrete 2 is formed and cured, disassemble the support plate 5; coat the inner side surface of the geogrid mat 4 with anticorrosion material, and block the positioning holes with the anticorrosion material.

[0041] In this application, by arranging a plurality of support rods 3 on the sides of a plurality of support plates 5, the support rods 3 are inserted and matched with the positioning holes and abutted against the inner wall of the culvert 1. After connecting and fixing two adjacent support plates 5, a support platform is formed inside, avoiding trampling on the geogrid mat 4 and damage to the structure, and being easy to install. The formed support platform can provide sufficient operating space and improve the overall construction efficiency.

[0042] As a specific implementation manner of the large-section culvert repair method provided by the present invention, please refer to Figure 2 and Figure 3 , a plurality of positioning holes are penetrated and opened at preset positions of the geogrid mat 4, including:

[0043] According to the size of the inner wall of the culvert 1 and the preset thickness of the concrete 2, the structure of a single geogrid mat 4 is welded to produce a closed-loop geogrid mat 4 with corresponding dimensions.

[0044] According to the positional relationship of a plurality of support rods 3 on the support plate 5, a plurality of corresponding positioning holes are opened along the circumferential direction of the geogrid mat 4.

[0045] In this application, before construction, a plurality of sheet-shaped geogrid mats 4 need to be welded so that a plurality of geogrid mats 4 form a closed-loop geogrid mat 4. At this time, a plurality of anchor nails 7 on the geogrid mat 4 are located on the outside. Since concrete 2 needs to be poured between the geogrid mat 4 and the culvert 1 and it is necessary to ensure that the thickness of the concrete 2 is equal along the circumferential direction of the culvert 1, corresponding production is required according to the size of the culvert 1 and the preset thickness of the concrete 2 when welding a plurality of individual geogrid mats 4. During construction, the welded geogrid mat 4 is sent into the culvert 1 from the inspection well. Since the geogrid mat 4 itself is a flexible part, it is convenient to directly insert it from the inspection well.

[0046] After the geogrid mat 4 is welded, positioning holes need to be opened at corresponding positions of the geogrid mat 4 according to the positions of a plurality of support rods 3 on the support plate 5. For the convenience of construction, the positioning holes can be evenly and spacedly opened on the geogrid mat 4. Usually, the culvert 1 is a trapezoidal structure. Therefore, the same geogrid mat 4 can correspond to four support plates 5. When the four support plates 5 are connected, the geogrid mat 4 can be evenly stretched, thus preparing for subsequent pouring of the concrete 2.

[0047] In this application, the support plate 5 is used for supporting and needs to be installed by workers inside the culvert 1. In order to reduce the weight of the support plate 5 itself, a plurality of weight-reducing holes are penetrated and opened on the support plate 5. A connecting plate can be arranged at the position of the support rod 3 on the support plate 5, that is, the support rod 3 is fixed on the connecting plate. A plurality of connecting plates are arranged on one support plate 5, and connecting ribs are arranged between the plurality of connecting plates. The connecting ribs are used to form a support platform with a plurality of support plates 5. The gaps between adjacent connecting ribs are the weight-reducing holes.

[0048] As a specific implementation of the large-section culvert repair method provided by the present invention, before successively pressing a plurality of support plates 5 against the corresponding inner sides of the geogrid mat 4 in the culvert 1, it further includes:

[0049] Coating glue for bonding with the geogrid mat 4 at multiple position points of the support plate 5.

[0050] Coating a release agent on the plurality of support rods 3.

[0051] In this application, since the geogrid mat 4 is a flexible part and the support plate 5 is a rigid part. In order to position the geogrid mat 4 on the support plate 5, so as to form a cavity for pouring concrete 2 between the geogrid mat 4 and the culvert 1. In this application, after the concrete 2 is cured and formed, the support plate 5 needs to be withdrawn from the geogrid mat 4. In order to avoid too high connection strength between the geogrid mat 4 and the support plate 5, resulting in the connection failure between the geogrid mat 4 and the concrete 2, the geogrid mat 4 and the support plate 5 are adhesively bonded at multiple points. During use, glue is coated at multiple position points of the support plate 5. While the plurality of support rods 3 on the support plate 5 are inserted and matched with the positioning holes, the geogrid mat 4 is adhesively bonded to the support plate 5, thus ensuring the reliable connection between the geogrid mat 4 and the support plate 5.

[0052] The support rod 3 penetrates through the geogrid mat 4 and abuts against the inner wall of the culvert 1. Since the support rod 3 is relatively long and the number of support rods 3 on the same support plate 5 is multiple, it is difficult to take out the support plate 5 from the geogrid mat 4 after the concrete 2 is cured and formed. For this reason, a release agent can be applied to the support rod 3 while applying the glue, which is convenient for taking out the support plate 5.

[0053] As a specific implementation of the large-section culvert repair method provided by the present invention, please refer to Figure 2 and Figure 3 , connecting and fixing two adjacent support plates 5 includes:

[0054] Inserting the connecting rod 6 into the fixing pipes of two adjacent support plates 5, so that a plurality of support plates 5 form a support structure arranged inside the geogrid mat 4.

[0055] In this application, the support plate 5 is a flat plate. Before assembly, multiple support plates 5 are in plug-in fit with the corresponding sides of the grid mat 4. For connection and fixation, and to facilitate installation and disassembly, multiple fixing tubes are respectively fixed on both side edges of the support plate 5. The fixing tubes on one support plate 5 are arranged to avoid the fixing tubes on two adjacent support plates 5. During actual installation, first place the bottommost support plate 5, then connect the two side support plates 5 respectively. Docking the fixing sleeves on the two support plates 5 and connecting and fixing them through the connecting rod 6. Finally, connect the support plate 5 at the topmost layer. After connecting the four support plates 5, a stable quadrilateral structure is formed. The support plate 5 at the bottom mainly plays a supporting role, while the support plates 5 on both sides and at the top are used to reserve a preset space for pouring the concrete 2, so that the thickness of the concrete 2 cured along the circumference of the culvert 1 can be ensured to be consistent without measurement. The final thickness of the concrete 2 can be determined according to the length of the support rod 3 and the thickness of the grid mat 4, without measurement, which is convenient for construction and has high efficiency.

[0056] As a specific implementation manner of the large-section culvert repair method provided by the present invention, please refer to Figure 5 , connecting and fixing the two side edges of two adjacent grid mats 4 along the length direction of the culvert 1 includes:

[0057] Place an annular gasket 10 between two adjacent grid mats 4, and make the outer peripheral surface of the annular gasket 10 fit on the culvert 1; connect the two adjacent side edges of the two grid mats 4 to the inner peripheral surface of the annular gasket 10.

[0058] In this application, if an integral cavity is formed inside the grid mat 4, although it seems simple, the resistance to the flow of the concrete 2 at the pouring end is relatively large during the pouring of the concrete 2, which ultimately makes it difficult for the concrete 2 to flow from one end to the other end, and at the same time, there will be an incomplete pouring phenomenon. For this reason, multiple grid mats 4 are provided, and two adjacent grid mats 4 need to be connected and fixed. In order to form a separate pouring cavity between the grid mat 4 and the culvert 1, an annular gasket 10 is provided on the inner sides of the two adjacent side edges of the two adjacent grid mats 4. The annular gasket 10 is arranged along the circumference of the culvert 1. First, the outer side surface of the annular gasket 10 fits on the inner wall of the culvert 1, and the inner side surfaces of the annular gasket 10 are respectively used to connect and fix the side edges of the two grid mats 4, thus realizing the sealing.

[0059] As a specific implementation manner of the large-section culvert repair method provided by the present invention, please refer to Figure 5 , connecting the two adjacent side edges of the two grid mats 4 to the inner peripheral surface of the annular gasket 10 includes:

[0060] Cut and align the two adjacent side edges of the two grid mats 4, and connect and fix the grid mat 4 and the annular gasket 10 through multiple expansion bolts 9 fixed on the inner wall of the culvert 1.

[0061] In this application, after two adjacent quick grid mats 4 are positioned, the two side edges of the two adjacent quick grid mats 4 overlap each other, facilitating subsequent cutting and processing. After aligning the two side edges of the two quick grid mats 4, an annular washer 10 is placed inside. After placing the annular washer 10, drilling is carried out with a drill until it drills into the culvert 1. An expansion bolt 9 is placed in each drilled hole, and positioning is completed by tightening the bolt. A pressure plate can be connected to the end of the expansion bolt 9, and the quick grid mat 4 is pressed by the pressure plate, ensuring the tightness between the annular washer 10 and the culvert 1.

[0062] As a specific implementation manner of the large-section culvert repair method provided by the present invention, please refer to Figure 5 , connecting and fixing the quick grid mat 4 and the annular washer 10 by a plurality of expansion bolts 9 fixed on the inner wall of the culvert 1 includes:

[0063] A plurality of fixing holes penetrating into the culvert 1 are drilled at intervals along the length direction of the annular washer 10, expansion bolts 9 are correspondingly placed in the plurality of fixing holes, and the nut at the end of the expansion bolt 9 is rotated to press the quick grid mat 4 against the annular washer 10.

[0064] In this application, after placing the annular washer 10 in two adjacent quick grid mats 4, it is necessary to drill from the inner side surface of the quick grid mat 4 into the culvert 1 with a drill, and the drilled fixing holes need to have a certain reserved length. After drilling is completed, the expansion bolt 9 is inserted into the fixing hole. After the expansion bolt 9 is positioned in the fixing hole. By connecting a pressure plate to the top of the expansion bolt 9 and tightening the nut above the pressure plate, the pressure plate presses the quick grid mat 4, and finally the annular washer 10 is closely attached to the inner wall of the culvert 1.

[0065] In this application, when the wall thickness of the culvert 1 is relatively low, the medium conveyed in the culvert 1 has relatively low corrosiveness, and the flow rate is relatively slow. An industrial glue for adhesively fixing on the inner wall of the culvert 1 can be coated on the outer peripheral surface of the annular washer 10, and the annular washer 10 is fixed by the industrial glue, thereby improving the efficiency of the entire construction.

[0066] As a specific implementation manner of the large-section culvert repair method provided by the present invention, please refer to Figure 4 , disassembling the support plate 5; coating an anticorrosive material on the inner side surface of the quick grid mat 4 and plugging the positioning holes with the anticorrosive material includes:

[0067] The support plate 5 is sequentially removed along the length direction of the culvert 1, and the anticorrosive material is extruded into the positioning holes.

[0068] In this application, after the concrete 2 is cured and formed, a plurality of support plates 5 can be removed starting from one side. After the removal of the support plates 5 is completed, an anticorrosive material can be coated on the inner side of the grid mat 4. Since the support rod 3 is inserted and matched with the grid mat 4, holes will appear in the grid mat 4 and the formed concrete 2. In order to fill them, the anticorrosive material can be extruded into the positioning holes and leveled with the surroundings, thus avoiding the influence on the medium flow. In this application, the coating of the anticorrosive layer 8 can be carried out while removing the support plates 5, improving the construction efficiency. When removing the support plates 5, the top support plate 5 is removed first. Since there is glue between the support plate 5 and the grid mat 4, the two side support plates 5 will not fall down after the top support plate 5 is removed. At the same time, since the side of the grid mat 4 away from the support plate 5 is connected with anchor nails 7, the connection between the grid mat 4 and the concrete 2 will not fail when the support plate 5 is removed.

[0069] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Method for repairing large-section culvert, characterized in that It includes the following steps: Clean the inner wall of the culvert, and a plurality of positioning holes are penetrated and provided at preset positions of the geogrid mattress; In the culvert, press a plurality of support plates against the corresponding inner sides of the geogrid mattress in sequence. A plurality of support rods on the support plates are inserted and matched with the corresponding positioning holes, and the plurality of support rods are abutted against the inner wall of the culvert; Connect and fix two adjacent support plates to expand the geogrid mattress along the inner wall of the culvert; connect and fix the two side edges of two adjacent geogrid mattresses along the length direction of the culvert; Pour concrete between the geogrid mattress and the inner wall of the culvert. After the concrete is formed and cured, disassemble the support plates; coat an anticorrosive material on the inner side surface of the geogrid mattress, and block the positioning holes with the anticorrosive material; The connecting and fixing of two adjacent support plates includes: Insert a connecting rod into the fixing pipes of two adjacent support plates to form a support structure arranged inside the geogrid mattress by the plurality of support plates; The penetrating and providing of a plurality of positioning holes at preset positions of the geogrid mattress includes: Weld a single geogrid mattress structure according to the size of the inner wall of the culvert and the preset thickness of the concrete, and manufacture a closed-loop geogrid mattress with corresponding dimensions; According to the positional relationship of the plurality of support rods on the support plate, a plurality of corresponding positioning holes are opened along the circumference of the geogrid mattress; Before pressing a plurality of support plates against the corresponding inner sides of the geogrid mattress in the culvert, it further includes: Coat glue for bonding with the geogrid mattress at a plurality of position points on the support plate; Coat a release agent on the plurality of support rods.

2. The large-section culvert repair method according to claim 1, characterized in that, The connecting and fixing of the two side edges of two adjacent geogrid mattresses along the length direction of the culvert includes: Place an annular gasket between two adjacent geogrid mattresses to make the outer peripheral surface of the annular gasket fit on the culvert; connect the two adjacent side edges of the two geogrid mattresses to the inner peripheral surface of the annular gasket.

3. The large-section culvert repair method according to claim 2, characterized in that The connecting of the two adjacent side edges of the two geogrid mattresses to the inner peripheral surface of the annular gasket includes: Cut and align the two adjacent side edges of the two geogrid mattresses, and connect and fix the geogrid mattress and the annular gasket through a plurality of expansion bolts fixed on the inner wall of the culvert.

4. The large-section culvert repair method according to claim 3, characterized in that, The connecting and fixing of the geogrid mattress and the annular gasket through a plurality of expansion bolts fixed on the inner wall of the culvert includes: Drill a plurality of fixing holes penetrating into the culvert at intervals along the length direction of the annular gasket, place the expansion bolts correspondingly in the plurality of fixing holes, and rotate the nuts at the ends of the expansion bolts to press the geogrid mattress against the annular gasket.

5. The large-section culvert repair method according to claim 1, characterized in that, The disassembling of the support plates; coating an anticorrosive material on the inner side surface of the geogrid mattress and blocking the positioning holes with the anticorrosive material includes: Remove the support plates in sequence along the length direction of the culvert, and squeeze the anticorrosive material into the positioning holes.

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