Construction technology for treating railway subgrade diseases by using subgrade sealing and subgrade body grouting

Abstract

The present application relates to the technical field of railway subgrade disease, and discloses a construction process for treating railway subgrade disease by adopting bed closure and subgrade body grouting, which comprises the following steps: step one: according to requirements, carry out the extraction of the sleeper and the square sleeper, the excavation of the bed and the bed, and the laying of the thick crushed stone cement layer at both ends of the bed and the surface layer of the bed, and the mixing of the super water-absorbing resin and the silica gel desiccant in the thick crushed stone cement layer; the water-absorbing stone cement layer is laid on the top of the thick crushed stone cement layer, the porous structure of the water-absorbing stone cement layer is used to quickly absorb water, and the water is discharged from the side of the bed through the water outlet pipe, so that the water is prevented from accumulating in the bed; the super water-absorbing resin and the silica gel desiccant are mixed in the thick crushed stone cement layer, the super water-absorbing resin and the silica gel desiccant are used to increase the water absorption performance of the thick crushed stone cement layer, and after the completion of water absorption, the silica gel desiccant can be reused by evaporating the moisture in the silica gel desiccant through high temperature.

Description

Technical Field

[0001] This invention relates to the field of railway subgrade disease technology, specifically a construction process for treating railway subgrade diseases by using subgrade sealing and subgrade body grouting. Background Technology

[0002] Patent CN202010214312.8 discloses a construction method for treating camber in high-speed railway subgrades. In the case of camber in the subgrade, working trenches are first manually excavated on both sides of the monolithic track bed along the track direction to separate the monolithic track bed from the shoulders and the inter-track sealing layer. Next, the cemented graded crushed stone layer under the monolithic track bed is cut in sections using a wire saw, and the graded crushed stone layer is jacked out in sections perpendicular to the track using hydraulic jacks. Then, the monolithic track bed is temporarily supported by a auger to keep it suspended. Finally, the track bed is lowered using mechanical jacks and the auger, and concrete is poured to fill the gaps, completing the track lowering and fine-tuning work. This method requires minimal construction equipment and manpower, and its scientific and effective construction sequence reduces pollution, saves costs, improves work efficiency, and effectively treats subgrade defects. This invention is mainly applied to the treatment of subgrade defects in high-speed railways.

[0003] However, in the process of treating railway subgrade defects, simply using concrete filling and grouting to seal the subgrade and treat the defects is not effective. Simply injecting grout into the subgrade cannot effectively improve the sealing effect. Moreover, using concrete filling is not very effective in absorbing moisture and water, and after absorption, the water cannot be actively drained. Summary of the Invention

[0004] The purpose of this invention is to provide a construction process for treating railway subgrade defects by using subgrade sealing and subgrade body grouting, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a construction process for treating railway subgrade defects by using subgrade sealing and subgrade body grouting, comprising the following steps:

[0006] Step 1: Remove the sleepers and square sleepers as required. The excavator cleans the track bed and subgrade. A thick layer of crushed stone cement is laid at both ends and on the surface of the subgrade. Super absorbent resin and silica gel desiccant are mixed into the thick crushed stone cement layer. A water-absorbing stone cement layer is laid on the thick crushed stone cement layer. Drainage pipes are inserted into the side of the water-absorbing stone cement layer. The ballast trough is filled and the subgrade surface is leveled. A 4‰ drainage slope is made laterally. A thick sealing material and a thick waterproof adhesive cloth are laid on the water-absorbing stone cement layer. The square sleepers proceed to the next process. This is an assembly line operation.

[0007] Step 2: Drill holes at equal intervals on the four sides of the top of the foundation bed using a drilling rig, insert grouting pipes into the holes, and use grouting equipment to inject grout into the grouting pipes to seal the bottom and four sides of the foundation bed.

[0008] Step 3: Restore the sleepers, tighten the bolts, determine the horizontal position of the track by using control stakes, and use manual labor and excavators to backfill ballast at the beginning and end points for transition, with a slope ratio not exceeding 2%;

[0009] Step 4: Manually backfill the track bed and slope ballast, with a track bed thickness of 300mm under the sleepers. During the ballast unloading process, ensure that the ballast is not excessive to ensure safety.

[0010] Step 5: After the ballast is filled, use a gantry crane to lift the track and a small group of machines to tamp and repair it. Because the track will sink a lot after the foundation bed is closed, sufficient ballast should be placed on the construction site and tamping should be strengthened. The elevation and direction of the track should be properly determined to prevent the train from shaking. After the construction is completed, the ballast on site will be transported to the designated location by tricycle.

[0011] In a preferred embodiment of the present invention, the thickness of both the thick crushed stone cement layer and the absorbent stone cement layer in step one is 25 mm.

[0012] In a preferred embodiment of the present invention, the thickness of the thick sealing material in step one is 50 mm, and the thickness of the thick waterproof adhesive cloth is 2 mm.

[0013] In a preferred embodiment of the present invention, the thickness of the under-pillow track bed in step four is 300 mm.

[0014] In a preferred embodiment of the present invention, the line elevation in step five is controlled within the range of 0 to +30 mm.

[0015] In a preferred embodiment of the present invention, the square misalignment of the sleepers in step five shall not exceed ±20mm.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. This invention lays a water-absorbing stone cement layer on top of a thick crushed stone cement layer. The loose and porous structure of the water-absorbing stone cement layer allows for rapid water absorption, which is then discharged from the side of the substrate through a water outlet pipe, preventing water accumulation inside the substrate. Superabsorbent resin and silica gel desiccant are mixed into the thick crushed stone cement layer to increase its water absorption capacity. Furthermore, after absorbing water, the silica gel desiccant can evaporate the internal moisture through high temperature, allowing it to be reused.

[0018] 2. This invention involves drilling holes at equal intervals on the four sides of the top of the foundation bed using a drilling rig, inserting grouting pipes into the holes, and using grouting equipment to inject grout into the grouting pipes. This grouting seals the bottom and four sides of the foundation bed, allowing for grouting not only inside the foundation bed but also forming a grouting layer on the four sides of the foundation bed after grouting, thus sealing the four sides of the foundation bed. Attached Figure Description

[0019] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the construction process for treating railway subgrade defects by using subgrade sealing and subgrade body grouting according to the present invention. Detailed Implementation

[0021] Please see Figure 1 This invention provides a technical solution: a construction process for treating railway subgrade defects by using subgrade sealing and subgrade body grouting, comprising the following steps:

[0022] Step 1: Remove the sleepers and square sleepers as required. The excavator cleans the track bed and subgrade. A thick layer of crushed stone cement is laid at both ends and on the surface of the subgrade. Super absorbent resin and silica gel desiccant are mixed into the thick crushed stone cement layer. A water-absorbing stone cement layer is laid on the thick crushed stone cement layer. Drainage pipes are inserted into the side of the water-absorbing stone cement layer. The ballast trough is filled and the subgrade surface is leveled. A 4‰ drainage slope is made laterally. A thick sealing material and a thick waterproof adhesive cloth are laid on the water-absorbing stone cement layer. The square sleepers proceed to the next process. This is an assembly line operation.

[0023] Step 2: Drill holes at equal intervals on the four sides of the top of the foundation bed using a drilling rig, insert grouting pipes into the holes, and use grouting equipment to inject grout into the grouting pipes to seal the bottom and four sides of the foundation bed.

[0024] Step 3: Restore the sleepers, tighten the bolts, determine the horizontal position of the track by using control stakes, and use manual labor and excavators to backfill ballast at the beginning and end points for transition, with a slope ratio not exceeding 2%;

[0025] Step 4: Manually backfill the track bed and slope ballast, with a track bed thickness of 300mm under the sleepers. During the ballast unloading process, ensure that the ballast is not excessive to ensure safety.

[0026] Step 5: After the ballast is filled, use a gantry crane to lift the track and a small group of machines to tamp and repair it. Because the track will sink a lot after the foundation bed is closed, sufficient ballast should be placed on the construction site and tamping should be strengthened. The elevation and direction of the track should be properly determined to prevent the train from shaking. After the construction is completed, the ballast on site will be transported to the designated location by tricycle.

[0027] It should be noted that by laying a water-absorbing stone cement layer on top of the thick crushed stone cement layer, the loose and porous structure of the water-absorbing stone cement layer can quickly absorb water and discharge it from the side of the subgrade through the water outlet pipe, thus avoiding water accumulation inside the subgrade. Superabsorbent resin and silica gel desiccant are mixed inside the thick crushed stone cement layer, which can increase the water absorption performance of the thick crushed stone cement layer. Moreover, after the silica gel desiccant absorbs water, the internal moisture can be evaporated by high temperature, allowing the silica gel desiccant to be reused. By drilling holes at equal intervals on the four sides of the top of the subgrade using a drilling rig and inserting grouting pipes into the holes, grout is injected into the grouting pipes using grouting equipment. Grouting seals the bottom and four sides of the subgrade. This not only allows grouting inside the subgrade, but also forms a grouting layer on the four sides of the subgrade, thus sealing the subgrade on all four sides.

[0028] Please refer to this embodiment. Figure 1 The thickness of both the thick stone cement layer and the water-absorbing stone cement layer in step one is 25mm.

[0029] Please refer to this embodiment. Figure 1 In step one, the thickness of the thick sealing material is 50mm and the thickness of the thick waterproof adhesive cloth is 2mm.

[0030] Please refer to this embodiment. Figure 1 The thickness of the underbed in step four is 300mm.

[0031] Please refer to this embodiment. Figure 1 In step five, the line elevation is controlled within the range of 0 to +30 mm.

[0032] Please refer to this embodiment. Figure 1 In step five, the squareness of the sleepers must not be more than ±20mm.

[0033] When using a construction process that combines subgrade sealing and roadbed grouting to treat railway subgrade defects, sleepers and square sleepers are removed as required. An excavator is used to clean the track bed and subgrade. A thick layer of crushed stone cement is laid at both ends and on the surface of the subgrade. This thick layer contains superabsorbent resin and silica gel desiccant. A layer of absorbent stone cement is then laid on top of this thick layer. Drainage pipes are inserted into the sides of the absorbent stone cement layer. Ballast trenches are filled, and the subgrade surface is leveled. A 4‰ drainage slope is created laterally. Finally, a layer of absorbent stone cement is laid on top of this layer. A thick layer of sealing material and a thick waterproof adhesive cloth are applied, and the square sleeper moves to the next process. In a continuous operation, holes are drilled at equal intervals on the four sides of the top of the subgrade using a drilling rig, and grouting pipes are inserted into the holes. Grouting equipment is used to inject grout into the grouting pipes. Grouting is then applied to the bottom and four sides of the subgrade to seal it. The sleeper is restored, the bolts are tightened, and the track plane position is determined by control piles. At the beginning and end points, ballast is backfilled manually with the help of an excavator for transition. The slope ratio is no more than 2%. The track bed and slope ballast are backfilled manually, and the thickness of the track bed under the sleeper is 300mm. During the ballast unloading process, ensure that the ballast is not excessive to ensure safety. After the ballast is filled, use a gantry crane to lift the track and a small group of machines to tamp and repair it. Because the track subsidence is large after the subgrade is closed, sufficient ballast is placed on the construction section, and tamping is strengthened. Find the height and direction of the track to prevent the occurrence of vehicle shaking. After the construction is completed, the ballast on site is transported to a designated location by tricycle. All parts are general standard parts or parts known to those skilled in the art. Their structure and principle can be known by the technical personnel through technical manuals or conventional experimental methods.

Claims

1. A construction process for treating railway subgrade defects by using subgrade sealing and subgrade body grouting, characterized in that, Includes the following steps: Step 1: Remove the sleepers and square sleepers as required. The excavator cleans the track bed and subgrade. A thick layer of crushed stone cement is laid at both ends and on the surface of the subgrade. Super absorbent resin and silica gel desiccant are mixed into the thick crushed stone cement layer. A water-absorbing stone cement layer is laid on the thick crushed stone cement layer. Drainage pipes are inserted into the side of the water-absorbing stone cement layer. The ballast trough is filled and the subgrade surface is leveled. A 4‰ drainage slope is made laterally. A thick sealing material and a thick waterproof adhesive cloth are laid on the water-absorbing stone cement layer. The square sleepers proceed to the next process. This is an assembly line operation. Step 2: Drill holes at equal intervals on the four sides of the top of the foundation bed using a drilling rig, insert grouting pipes into the holes, and use grouting equipment to inject grout into the grouting pipes to seal the bottom and four sides of the foundation bed. Step 3: Restore the sleepers, tighten the bolts, determine the horizontal position of the track by using control stakes, and use manual labor and excavators to backfill ballast at the beginning and end points for transition, with a slope ratio not exceeding 2%; Step 4: Manually backfill the track bed and slope ballast, with a track bed thickness of 300mm under the sleepers. During the ballast unloading process, ensure that the ballast is not excessive to ensure safety. Step 5: After the ballast is filled, use a gantry crane to lift the track and a small group of machines to tamp and repair it. Because the track will sink a lot after the foundation bed is closed, sufficient ballast should be placed in the construction area and tamping should be strengthened. The elevation and direction of the track should be properly determined to prevent the vehicle from shaking. After the construction is completed, the ballast on site should be transported to the designated location by tricycle. The thickness of both the thick crushed stone cement layer and the absorbent stone cement layer in step one is 25mm. The thickness of the thick sealing material in step one is 50mm, and the thickness of the thick waterproof adhesive cloth is 2mm.

2. The construction process for treating railway subgrade defects by using subgrade sealing and subgrade body grouting as described in claim 1, characterized in that: The thickness of the underbed in step four is 300mm.

3. The construction process for treating railway subgrade defects by using subgrade sealing and subgrade body grouting as described in claim 1, characterized in that: The elevation of the line in step five is controlled within the range of 0 to +30 mm.

4. The construction process for treating railway subgrade defects by using subgrade sealing and subgrade body grouting as described in claim 1, characterized in that: In step five, the squareness of the sleepers must not be more than ±20mm.

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