Pavement walling crib in-situ repair construction method

Abstract

The invention discloses an in-situ repair construction method for a road surface walling crib. The in-situ repair construction method comprises the following steps that S1, the position and the sinking depth of a sunken well lid are determined; s2, with the sunken well lid as the center, an annular groove is dug in the circumferential set range of the sunken well lid; s3, base surface treatment; s4, a mounting support is placed in the circumferential direction of the annular groove, a well ring is placed on the mounting support, and the well ring is lowered to be flush with the road surface elevation through the mounting support; s5, preparing composite mortar and pouring the composite mortar into the annular groove; s6, leveling and surface treatment; s7, after the composite mortar reaches the set strength, the mounting support is removed, and the periphery of the walling crib is backfilled with an asphalt mixture and compacted; when the sunken well lid is repaired, minimum excavation can be achieved, the work amount can be remarkably reduced, the well ring can be accurately positioned by arranging the mounting support, and the construction effect is improved.

Description

Technical Field

[0001] This invention relates to the field of municipal road engineering technology, and in particular to a method for in-situ repair of road manhole covers. Background Technology

[0002] Currently, the road surface around manhole covers such as storm drains and sewage wells on municipal roads frequently suffers from defects such as cracking of the asphalt concrete around the manholes and subsidence of the manhole covers themselves. This seriously affects driving comfort, road aesthetics, and traffic safety. Traditional repair methods have the following drawbacks: First, the process is cumbersome and has a significant impact on traffic, usually requiring large-scale breaking and excavation of the existing road surface and base layer around the manhole, which is time-consuming and necessitates lane closures, leading to heavy traffic congestion. Second, rigid connections are prone to further damage. Traditional methods often involve rebuilding the manhole casing and installing the manhole base using brick masonry or cast-in-place concrete. The shrinkage differences and seams between the old and new materials make it difficult for them to effectively cooperate with the surrounding flexible asphalt pavement for stress distribution. Under repeated impacts from vehicle loads, cracking and subsidence easily occur again, leading to repeated repairs.

[0003] Therefore, it is necessary to improve the existing methods for repairing road surface subsidence manhole covers so that construction can be completed quickly, without large-scale excavation, with high bonding strength with the original structure, and can deform in tandem with flexible pavement. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a method for in-situ repair of road manhole rings, which can be completed quickly, without large-area excavation, has high bonding strength with the original structure, and can deform in tandem with the flexible pavement after repair.

[0005] The in-situ repair method for road manhole covers of the present invention includes the following steps:

[0006] S1. Determine the location and depth of the sunken manhole cover;

[0007] S2. Using the manhole cover as the center, excavate an annular groove within a predetermined circumferential range of the manhole cover;

[0008] S3. Base surface treatment;

[0009] S4. Place the mounting bracket around the annular groove, place the new manhole ring on the mounting bracket, and lower the new manhole ring to be level with the road surface elevation using the mounting bracket;

[0010] S5. Prepare composite mortar and pour the composite mortar into the annular groove;

[0011] S6. Leveling and surface treatment;

[0012] S7. After the composite mortar reaches the set strength, remove the installation bracket, backfill the asphalt mixture around the new well ring and compact it.

[0013] Furthermore, in step S1, a laser level is used to measure the depth of the sunken manhole cover relative to the road surface elevation.

[0014] Furthermore, in step S2, the distance between the annular groove and the outer wall of the well ring is 10cm to 20cm, and the well ring is excavated downwards until the sunken well cover is exposed.

[0015] Furthermore, step S3 includes the following steps:

[0016] S31. Clean the annular groove of slag and dust;

[0017] S32. Apply an interface adhesive to the sidewalls of the exposed manhole cover ring and the bottom of the annular groove.

[0018] Furthermore, in step S4, the mounting bracket includes a frame, a support bracket, and a support member. The support member is disposed on the frame, and the support bracket is connected to the bottom of the support member. The drivable rotation of the support member is used to drive the support bracket to move along the axial direction of the support member, and the new well ring is placed on the support bracket.

[0019] Furthermore, the support bracket has a cross-shaped structure, including a fixed cross portion and an adjustable cross portion. The adjustable cross portion is detachably and fixedly connected to the fixed cross portion, and the fixed cross portion is provided with a threaded portion that mates with the support member.

[0020] Furthermore, the support member is a rod-shaped structure, the support member passes through the meshing part and is threadedly engaged with the meshing part, and a limiting part is provided at the bottom of the support member.

[0021] Furthermore, the mounting bracket also includes a drive motor I, the frame includes a platform section and several support legs arranged circumferentially on the platform section, and the drive motor I is disposed on the platform section and is connected to the support member for transmission.

[0022] Furthermore, the mounting bracket also includes a drive motor II disposed on the support leg and a drive rod that is drively connected to the drive motor II. The support bracket is provided with a connecting part that cooperates with the drive rod, and the drive rod is connected to the connecting part.

[0023] Furthermore, in step S6, leveling is performed before the composite slurry initially sets, and a layer of gravel is spread on the surface.

[0024] The beneficial effects of this invention are as follows: The in-situ repair method for road manhole covers of this invention can minimize the amount of excavation and speed up the construction progress. At the same time, the use of composite mortar as an interface adhesive can firmly combine the newly installed manhole cover with the old manhole to form a new system that works together to bear the load. By setting up installation brackets, the new manhole cover can be accurately positioned for installation, ensuring construction quality. Meanwhile, the overall construction period is greatly shortened, which can reduce the impact on traffic. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0026] Figure 1 This is a front view of the mounting bracket of the present invention in use;

[0027] Figure 2 A structural diagram showing the fit between the support bracket and the new well ring;

[0028] Figure label:

[0029] 1. Mounting bracket; 2. New well ring; 3. Support rod; 4. Drive motor I; 5. Outrigger; 6. Drive motor II; 7. Drive rod; 8. Support bracket; 801. Fixed cross section; 802. Adjustable cross section. Detailed Implementation

[0030] like Figure 1-2 As shown: The in-situ repair method for road manhole covers in this embodiment includes the following steps:

[0031] S1. Determine the location and depth of the sunken manhole cover; determining the depth of the sunken manhole cover helps determine the final repair height required.

[0032] S2. Using the manhole cover as the center, excavate an annular groove within a predetermined circumferential range of the manhole cover; using the manhole cover as the center, excavate an annular groove, generally at a distance of 10-20cm from the outer diameter of the manhole ring of the manhole cover, and the excavation depth is sufficient to expose the manhole ring or old manhole cylinder of the manhole cover, thereby breaking up the failed asphalt concrete and loose base layer.

[0033] S3. Base surface treatment; Base surface treatment is carried out to remove gravel, dust and other debris from the excavated area to facilitate the next construction process.

[0034] S4. Place the mounting bracket 1 around the annular groove, place the new manhole ring 2 on the mounting bracket 1, and lower the new manhole ring 2 to be level with the road surface elevation using the mounting bracket 1; the mounting bracket 1 provides support for the new manhole ring 2, and the new manhole ring 2 is lowered (along the road surface elevation) using the mounting bracket 1. Figure 1 The vertical direction should be aligned with the road surface elevation to improve installation accuracy.

[0035] S5. Prepare composite mortar and pour it into the annular groove; use a portable mixer to mix a two-component high-strength, non-shrink, fast-curing polymer-modified cementitious composite material and epoxy mortar in proportion, so that the mixed composite mortar can have high fluidity / self-leveling, early strength and fast hardening, micro-expansion / non-shrinkage, ultra-high strength and toughness. Pour the mixed composite mortar evenly into the annular groove from all sides until the mortar is completely filled and slightly higher than the base surface.

[0036] S6. Leveling and surface treatment: Before the slurry initially sets, fine leveling can be carried out, and a layer of small-diameter crushed stone can be evenly spread on the surface of the newly poured composite material to enhance the adhesion with the subsequent asphalt material.

[0037] S7. After the composite mortar reaches the set strength, remove the installation bracket 1, backfill with asphalt mixture around the new manhole ring 2 and compact it. Generally, the composite mortar reaches the set strength after 2-4 hours. At this time, remove the installation bracket 1, backfill with asphalt mixture around the new manhole ring 2 and compact it. Generally, a small road roller or rammer is used for compaction to ensure a smooth connection between the asphalt pavement around the manhole and the manhole cover. Because the composite mortar has early strength characteristics, traffic can be quickly reopened after maintenance. Generally, after the new manhole ring 2 is installed, the manhole cover body is installed.

[0038] In this embodiment, in step S1, a laser level is used to measure the depth of the sunken manhole cover relative to the road surface elevation. This facilitates the determination of the final lifting height required for construction.

[0039] In this embodiment, in step S2, the distance between the annular groove and the outer wall of the well ring is 10cm to 20cm. The well ring is excavated downwards until the sunken well cover is exposed, which is the height at which the new well cover needs to be.

[0040] In this embodiment, step S3 includes the following steps:

[0041] S31. Clean and remove slag and dust from the annular trench; use high-pressure air (such as an air compressor) and steel brushes to thoroughly remove gravel, dust and loose materials from the excavation pit to ensure the base surface is clean and dry.

[0042] S32. Apply an interface adhesive to the sidewalls of the exposed sunken manhole cover ring and the bottom of the annular groove. Apply a special polymer epoxy resin-based interface agent to the exposed original concrete manhole ring / cylinder sidewalls and pit bottom base surface. This interface agent can penetrate deep into the micropores of concrete, significantly improving the bonding strength and sealing performance of the new and old materials.

[0043] In this embodiment, in step S4, the mounting bracket 1 includes a frame, a support bracket 8, and a support member 3. The support member 3 is disposed on the frame, and the support bracket 8 is connected to the bottom of the support member 3. The drivable rotation of the support member 3 is used to drive the support bracket 8 to move along the axial direction of the support member 3, and the new well ring is placed on the support bracket 8.

[0044] Specifically, the old manhole cover is removed, and a mounting bracket 1 is installed at the manhole opening. The mounting bracket 1 spans the manhole opening, and then the manhole ring is placed on the support bracket 8. External force drives the support member 3 to rotate, thereby causing the support bracket 8 to move axially along the support member 3. The new manhole ring 2 is then placed on top of the support bracket 8 (relative to...). Figure 1 (Up and down direction), thereby moving the new well ring 2 by moving the support bracket 8 until the top surface elevation of the new well ring 2 is adjusted to be level with the final designed road surface elevation, and then the level is used for precise calibration and temporary locking.

[0045] In this embodiment, the support bracket 8 has a cross-shaped structure, including a fixed cross portion 801 and an adjustable cross portion 802. The adjustable cross portion 802 is detachably and fixedly connected to the fixed cross portion 801. The fixed cross portion 801 has a threaded portion that mates with the support member 3. The fixed cross portion 801 consists of two vertical rods, with a threaded portion at the center that mates with the support member 3. The support member 3 is generally a screw. The end of the fixed cross portion 801 has a threaded groove that mates with the adjustable cross portion 802. The adjustable cross portion 802 consists of four threaded rods, with one threaded end threadedly connected to the threaded groove. This allows the length of the threaded end screwed into the threaded groove to be adjusted as needed to accommodate different sizes of manhole covers. After the new manhole cover 2 is installed, the adjustable cross portion 802 can be disassembled, and the frame can be removed, allowing the mounting bracket 1 to be reused.

[0046] In this embodiment, the support member 3 is a rod-shaped structure. The support member 3 passes through the meshing part and is threaded into the meshing part. A limiting part is provided at the bottom of the support member 3. By providing the limiting part, the support bracket 8 can be prevented from dislodging from the support rod 3, thereby improving the stability of movement.

[0047] In this embodiment, the mounting bracket 1 further includes a drive motor I4. The frame includes a platform section and several support legs 5 arranged around the platform section. The drive motor I4 is located on the platform section and is connected to the support member 3 for transmission. There are generally four support legs 5. The support legs 5 and the platform form a quadrangular pyramid structure. The support legs 5 are located around the new well ring 2 and drive the support member 3 to move through the drive motor I4, thereby facilitating adjustment.

[0048] In this embodiment, the mounting bracket 1 further includes a drive motor II 6 disposed on the support leg 5 and a drive rod 7 that is connected to the drive motor II 6 in a transmission manner. The support bracket 8 is provided with a connecting part that cooperates with the drive rod 7, and the drive rod 7 is connected to the connecting part. By setting up drive motor II6 and drive rod 7, when the manhole cover is located on a slope, the number of drive motor II6 and drive rod 7 is consistent with the number of outriggers 5. Drive motor II6 can drive the corresponding drive rod 7 to move, and drive rod 7 can drive support bracket 8 to move, thereby adjusting the inclination of support bracket 8 to adapt to the slope and allowing it to fall to the position where the new manhole ring 2 is to be installed. Drive motor I4 and drive motor II6 are hollow motors. Drive motor II6 is hinged to outrigger 5, and drive rod 7 is hinged to support bracket 8. The connection part is a hinge seat that cooperates with drive rod 7. Alternatively, drive motor II6 and drive rod 7 can be replaced with flexible ropes. The two ends of the flexible ropes are tied to outrigger 5 and support bracket 8 respectively. The inclination of support bracket 8 can be adjusted by adjusting the length of the flexible ropes. At the same time, when the new manhole ring 2 is placed on support bracket 8, it can be fixed by buckles to improve the stability of installation.

[0049] In this embodiment, in step S6, leveling is performed before the composite slurry initially sets, and a layer of crushed stone is spread on the surface. Generally, basalt crushed stone is spread, which can improve the adhesion with asphalt.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for in-situ repair of road manhole covers, characterized in that: Includes the following steps: S1. Determine the location and depth of the sunken manhole cover; S2. Using the manhole cover as the center, excavate an annular groove within a predetermined circumferential range of the manhole cover; S3. Base surface treatment; S4. Place the mounting bracket around the annular groove, place the new manhole ring on the mounting bracket, and lower the new manhole ring to be level with the road surface elevation using the mounting bracket; S5. Prepare composite mortar and pour the composite mortar into the annular groove; S6. Leveling and surface treatment; S7. After the composite mortar reaches the set strength, remove the installation bracket, backfill the asphalt mixture around the new well ring and compact it.

2. The method for in-situ repair of road manhole covers according to claim 1, characterized in that: In step S1, a laser level is used to measure the depth of the sunken manhole cover relative to the road surface elevation.

3. The method for in-situ repair of road manhole covers according to claim 1, characterized in that: In step S2, the distance between the annular groove and the outer wall of the well ring is 10cm to 20cm, and the well ring is excavated downwards until the sunken well cover is exposed.

4. The method for in-situ repair of road manhole covers according to claim 3, characterized in that: Step S3 includes the following steps: S31. Clean the annular groove of slag and dust; S32. Apply an interface adhesive to the sidewalls of the exposed manhole cover ring and the bottom of the annular groove.

5. The method for in-situ repair of road manhole covers according to claim 1, characterized in that: In step S4, the mounting bracket includes a frame, a support bracket, and a support member. The support member is disposed on the frame, and the support bracket is connected to the bottom of the support member. The drivable rotation of the support member is used to drive the support bracket to move along the axial direction of the support member, and the new well ring is placed on the support bracket.

6. The method for in-situ repair of road manhole covers according to claim 5, characterized in that: The support bracket has a cross-shaped structure, including a fixed cross part and an adjustable cross part. The adjustable cross part is detachably and fixedly connected to the fixed cross part. The fixed cross part is provided with a threaded part that mates with the support member.

7. The method for in-situ repair of road manhole covers according to claim 6, characterized in that: The support member is a rod-shaped structure. The support member passes through the meshing part and is threadedly engaged with the meshing part. A limiting part is provided at the bottom of the support member.

8. The method for in-situ repair of road manhole covers according to claim 5, characterized in that: The mounting bracket also includes a drive motor I. The frame includes a platform section and several support legs arranged around the platform section. The drive motor I is located on the platform section and is connected to the support member for transmission.

9. The method for in-situ repair of road manhole covers according to claim 8, characterized in that: The mounting bracket also includes a drive motor II disposed on the support leg and a drive rod that is connected to the drive motor II in a transmission manner. The support bracket is provided with a connecting part that cooperates with the drive rod, and the drive rod is connected to the connecting part.

10. The method for in-situ repair of road manhole covers according to claim 1, characterized in that: In step S6, leveling is performed before the composite slurry initially sets, and a layer of crushed stone is spread on the surface.

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