Transverse grouting method for cement pavement plate bottom

Abstract

The application discloses a cement pavement replacement plate bottom transverse grouting method, which adopts radar for real-time matching grouting, moves a grouting head to a position needing grouting after accurately detecting a void position, and avoids blind and large-scale grouting, which wastes materials on one hand and causes uneven jacking force on the replacement plate pavement on the other hand, and new voids are formed in the areas not originally voided; and the application adopts a horizontal grouting mode, grout flows horizontally, and the treatment efficiency of the voids under the plate is higher, and the horizontal supporting effect is better; after the fast-setting material is used for plugging, secondary voids formed in the later period can be subjected to high-pressure splitting grouting again.

Description

Technical Field

[0001] This invention belongs to the field of road repair technology, and particularly relates to a method for transverse grouting under the slab of a cement road surface replacement. Background Technology

[0002] Cement pavements are designed for a 20-year lifespan. After prolonged use, they may develop defects such as broken slabs and corner cracks. During maintenance, damaged slabs are often removed using excavators and replaced with new slabs. However, when using excavation equipment to remove old slabs, the excavation reaches a certain depth below the pavement layer. The vibration from the excavator causes subgrade soil beneath adjacent slabs to loosen, creating voids under the adjacent slabs. This leads to a redistribution of stress in both the new and adjacent slabs. While the adjacent slab remains open to traffic, the area and depth of the voids continue to increase, expanding the void area under the joint between the old and new slabs. Both the adjacent and new slabs become cantilever structures. Shortly after the replacement, corner cracks reappear, affecting road traffic.

[0003] Current methods for grouting under slab voids often employ extensive vertical grouting, with the grouting nozzle penetrating to the bottom of the void layer. However, this method, primarily vertical, results in a vertical grout flow, limiting the horizontal coverage of individual holes. If voids remain under the slab after replacement, the newly replaced slab needs to be damaged. Furthermore, poor control of the grouting surface can easily lead to slab lifting in certain areas. This invention utilizes pre-embedded horizontal grouting pipes, injecting grout in a horizontal laminar flow pattern. A single grouting operation covers a larger horizontal area, and the pressure of the horizontal grout allows for effective flow into the void surface, forming a horizontal support surface without damaging the pavement structure.

[0004] Therefore, there is an urgent need to design a transverse grouting method for the bottom of cement pavement slab replacement. Summary of the Invention

[0005] The purpose of this invention is to provide a method for transverse grouting at the bottom of cement pavement slab replacement slabs to solve the above-mentioned problems.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] A transverse grouting method for the underside of cement pavement slabs, used for repairing damaged pavements, includes the following steps:

[0008] The damaged road surface was excavated down to the base layer;

[0009] A transverse grouting pipe is laid along the edge of the excavated pit, and a group of grouting holes is opened around the transverse grouting pipe;

[0010] Concrete is poured on top of the base layer to form a pavement with replaced slabs;

[0011] Testing the plate-replacement road repair condition using a ground-penetrating device to determine the void position at the stress release area;

[0012] A grouting head is placed in the transverse grouting pipe and slides to the void position in the transverse grouting pipe, the grouting head and the transverse grouting pipe form a closed space, and the grouting operation is performed by grouting outward through the grouting hole group on the transverse grouting pipe.

[0013] After the grouting pressure is reached in the transverse grouting pipe, the grouting hole group is blocked, and the grouting head is pulled out.

[0014] The transverse grouting pipe is embedded flush with the top of the base layer.

[0015] At least two opposite grouting hole groups are provided on the transverse grouting pipe.

[0016] The transverse grouting pipe is made of cast iron.

[0017] The grouting hole group is blocked by fast-setting material.

[0018] The grouting head side wall is provided with a grout outlet; both ends of the grouting head are provided with a grout stop valve, and the grout stop valve is connected with the grouting hose.

[0019] Compared with the prior art, the application has the following advantages and technical effects: the application uses radar for real-time grouting, accurately detects the void position, and moves the grouting head to the position where grouting is needed, thereby avoiding blind and large-scale grouting, which not only wastes materials but also causes uneven jacking force on the plate-replacement road surface, forming new voids in the original void area; the application uses horizontal grouting, the grout flows horizontally, and the treatment efficiency of the void under the plate is higher, the horizontal support effect is better, and after the fast-setting material is used for blocking, secondary voids formed later can be subjected to high-pressure splitting grouting again. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor:

[0021] Figure 1 The flowchart of the application;

[0022] Figure 2 The plan view of the plate-replacement road surface structure;

[0023] Figure 3 The installation schematic diagram of the transverse grouting pipe;

[0024] Figure 4 Fig. 1 is a schematic view of a transverse grouting pipe structure;

[0025] Figure 5 Fig. 2 is a schematic view of a grouting head structure;

[0026] Wherein, 1, transverse grouting pipe; 2, base layer; 3, slab-replaced pavement; 4, grouting hole group; 5, grouting head; 6, grouting stop valve. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be apparently and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the present application.

[0028] In order to make the above-mentioned objects, features and advantages of the present application more apparent and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0029] The cement pavement slab-replaced transverse grouting method is used for damaged pavement repair, and comprises the following steps:

[0030] The damaged pavement is excavated to the base layer;

[0031] The transverse grouting pipe is arranged along the edge of the excavated pit, and the transverse grouting pipe is provided with a grouting hole group around the pipe;

[0032] The concrete is poured above the base layer to form the slab-replaced pavement;

[0033] The ground penetrating equipment is used to test the repair condition of the slab-replaced pavement to determine the void position at the stress release area;

[0034] The grouting head is placed in the transverse grouting pipe, the grouting head is slid to the void position in the transverse grouting pipe, the grouting head and the transverse grouting pipe form a closed space, the grouting hole group on the transverse grouting pipe is used to outwardly grout, and the grouting operation is performed;

[0035] After the grouting pressure in the transverse grouting pipe is reached, the grouting hole group is blocked, and the grouting head is extracted.

[0036] The transverse grouting pipe 1 is embedded at the top of the base layer 2.

[0037] The transverse grouting pipe 1 is provided with at least two opposite grouting hole groups 4.

[0038] The transverse grouting pipe 1 is a cast iron pipe.

[0039] The group of grouting holes 4 is blocked by the quick-setting material.

[0040] The grouting head 5 is provided with a grouting outlet in the side wall, and the grouting head 5 is provided with a grouting stop valve 6 at both ends and is communicated with the grouting hose through the grouting stop valve.

[0041] In an embodiment of the present application, the grouting slurry is not limited to cement slurry, CA mortar, asphalt and the like, and after the grouting reaches the preset pressure, the quick-setting material is injected to block and press, and after the quick-setting material is blocked and solidified, the next grouting position is moved to.

[0042] In an embodiment of the present application, the ground penetrating device is selected as a ground penetrating radar, and the ground penetrating radar is used for real-time grouting, and after the position of the void is detected and determined, the grouting head 5 is moved to the void position in the transverse grouting pipe 1 to realize accurate grouting.

[0043] Further, the step can avoid blind and large-scale grouting, on the one hand, the material is wasted, and on the other hand, the large-scale grouting causes uneven jacking force on the plate body, so that new voids are formed in the original void area.

[0044] In an embodiment of the present application, compared with the original vertical grouting mode, after the grouting pipe discharges the slurry, the pressure of the slurry is downward, and the voids are mostly in a layered form, the vertical pressure is dissipated on the jacking base layer, the laminar flow pressure of the slurry is low, and the position of the grouting outlet is easy to form local slurry accumulation jacking force, which has poor treatment effect on the voids.

[0045] Further, the horizontal grouting mode adopted in the present application has the slurry in a horizontal flow, and has higher treatment efficiency on the voids under the plate and better horizontal jacking effect.

[0046] In an embodiment of the present application, the grouting head 5 is provided with a movable grouting outlet, after the full pressure is reached, the quick-hardening and micro-expansion material is used for external pipe blocking and pressure holding, so that the jacking stress of the repaired plate body is restored.

[0047] In an embodiment of the present application, after the grouting head 5 is blocked by the quick-setting material, the grouting head 5 can still move in the transverse grouting pipe, and when new voids are found due to the dynamic load, the splitting and re-grouting can be carried out, so that the secondary damage to the road surface caused by the traditional grouting is avoided, and the damage to the underwater permeable pavement is avoided.

[0048] In an example of the present application, in the G324 certain section of the construction of the replacement plate, the excavator is used to break the damaged cement pavement, the breaking plate size is 3*4m, the exposed base surface after breaking is cleaned, the force transmission bar is arranged at the adjacent plate, then a circle of transverse grouting pipe 1 is closely arranged along the adjacent plate of the breaking plate, in order to ensure that the position of the transverse grouting pipe 1 does not change, a 1cm deep groove is dug on the base, the transverse grouting pipe 1 is placed in the groove, and the pipe diameter is 3.2cm; the grouting hole group 4 is arranged on the upper side wall of the transverse grouting pipe 1, and the holes are arranged at intervals of 5cm. Then the new replacement plate is poured, the new replacement plate is cured for 14 days, and the replacement plate is detected by using the ground penetrating radar and the FWD. The stress release void area at the plate edge is detected and marked on the road surface; the grouting head 5 is placed, the grouting head 5 is pushed to the position to be grouted, grouting is carried out, the grouting pressure is controlled at 0.5MPa, when the pressure continues to be stable at 0.8MPa for more than 1min, the grouting is stopped, the grouting effect is detected by using the radar, after the grouting is full, the quick-setting material is poured, the grouting is carried out inwardly, the quick-setting material is cured after 5min, the grouting part is blocked, the pressure grouting body is formed, the supporting force is formed on the road surface, 100kg of cement slurry and 10kg of quick-setting material are used, the grouting head is taken out, the water is poured in the grouting pipe for cleaning, and the grouting is used next time. Curing for 7d. After opening the traffic for 7d, the ground penetrating radar is used for detection, the new void is formed under the action of the vehicle load, the grouting can be carried out again, and the new replacement plate and the adjacent plate are ensured to be in close contact with the base.

[0049] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application.

[0050] The above-described embodiments are only used to describe the preferred modes of the present application, and do not limit the scope of the present application, and various modifications and improvements to the technical solutions of the present application made by those skilled in the art without departing from the design spirit of the present application shall fall within the protection scope of the present application.

Claims

1. A method for transverse grouting of the bottom of a cement pavement slab for the repair of a damaged pavement, characterized in that, The method comprises the following steps: Excavating the damaged pavement to the base layer; Laying a transverse grouting pipe along the edge of the excavated pit, the transverse grouting pipe being provided with a group of grouting holes around the pipe; Pouring concrete on the base layer to form a new pavement; Testing the repair condition of the new pavement using a ground penetrating device to determine the void position at the stress release area; Placing a grouting head in the transverse grouting pipe, the grouting head sliding in the transverse grouting pipe to the void position, the grouting head and the transverse grouting pipe forming a sealed space, grouting outward through the group of grouting holes on the transverse grouting pipe to perform grouting work; After the grouting pressure in the transverse grouting pipe is reached, the group of grouting holes is blocked, and the grouting head is pulled out; The transverse grouting pipe (1) is provided with at least two groups of grouting holes (4) opposite to each other; The grouting head (5) is provided with a grouting outlet on the side wall, and the grouting head (5) is provided with a stop valve (6) at both ends, and the stop valve is communicated with a grouting hose; The transverse grouting pipe (1) is embedded flush with the top of the base layer (2); The group of grouting holes (4) is blocked by quick-setting material.

2. The method for cement pavement slab bottom transverse grouting according to claim 1, characterized in that: The transverse grouting pipe (1) is made of cast iron.

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