Reinforcing and stabilizing structure for soft soil roadbed

Abstract

The utility model belongs to the technical field of roadbed foundations, and particularly relates to a reinforcing and stabilizing structure for a soft soil roadbed. A reinforcing and stabilizing structure for a soft soil roadbed comprises a pile connecting wall arranged at the boundary of the range, occupied by a road, of the soft soil roadbed; the grouting anchor rod penetrates through the pile connecting wall and is inserted into the lower part of the foundation; and the embedded steel bars penetrate through the pile connecting wall to be inserted into the lower portion of the foundation. In the reinforcing and stabilizing structure, the embedded steel bars are arranged below the roadbed, after grouting is conducted on the lower portion of the roadbed through the grouting anchor rods, the embedded steel bars play a supporting role of a steel bar framework, grout is condensed, the embedded steel bars are embedded, and therefore the lower portion of the roadbed can be better reinforced and stably supported. The overall structure stability of the roadbed structure is guaranteed, the stability of a foundation is greatly improved, and large-limit settlement of the roadbed is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of roadbed foundation, and in particular relates to a strengthening and stabilizing structure for soft soil roadbed. Background Art

[0002] During the road construction process, some sections have high water content, especially those with well-developed surface water systems along the roads, such as paddy fields, ponds, ditches and other surface water in low-lying areas along the roads; this type of geological rock and soil generally includes plain fill, fill soil, miscellaneous fill soil, cultivated soil, and silty clay. For the above-mentioned soft soil roadbed conditions, conventional reinforced stabilization structures cannot meet the settlement standards of the roadbed at all, the construction quality is poor, and the road surface will repeatedly crack and suffer from diseases in the later stage, resulting in high maintenance costs.

[0003] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Utility Model Content

[0004] The purpose of the utility model is to provide a strengthening and stabilizing structure for soft soil roadbed, so as to at least solve the above-mentioned problems existing in the prior art.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A strengthening and stabilizing structure for a soft soil roadbed, the strengthening and stabilizing structure comprising:

[0007] A pile-connected wall, which is arranged at the boundary of the soft soil roadbed range occupied by the road and is used to surround the soft soil roadbed within the road range;

[0008] A grouting anchor rod, the grouting anchor rod is inserted into the bottom of the foundation through the pile wall, and the grouting anchor rod is used for grouting under the roadbed;

[0009] The embedded steel bars are inserted through the pile-connected wall to below the foundation.

[0010] As described above, for the reinforced and stabilized structure for the soft soil roadbed, preferably, the pile-connected wall is made of cement mixing piles, and two adjacent cement mixing piles have overlapping and staggered parts.

[0011] As described above, for the reinforced and stabilized structure for the soft soil roadbed, preferably, the pile-connected wall is made of jet grouting piles, two adjacent jet grouting piles have overlapping and staggered parts, and I-beams are inserted in the jet grouting piles, and there is at least one jet grouting pile between two adjacent jet grouting piles inserted with the I-beams.

[0012] As described above, for the reinforced and stabilized structure for the soft soil roadbed, preferably, grouting anchor rods are provided through the pile-connected walls on both sides of the soft soil roadbed.

[0013] As described above, for the reinforced and stabilized structure for the soft soil roadbed, preferably, embedded steel bars are provided through the pile-connected walls on both sides of the soft soil roadbed.

[0014] As described above, for the reinforced and stabilized structure of the soft soil roadbed, preferably, the implanted steel bars penetrate the slurry penetration range of the grouting anchor rods on both sides of the soft soil roadbed;

[0015] The embedded steel bars on one side of the soft soil roadbed are inserted into the slurry penetration range of the grouting anchor rods on the other side of the soft soil roadbed.

[0016] As described above, the reinforced and stabilized structure for soft soil roadbed is preferably provided in the pile-connected wall when the depth of the soft soil roadbed to be treated is less than or equal to 3 meters, and replacement gravel soil is provided in the pile-connected wall, and pieces of stone are provided at the bottom of the replacement gravel soil.

[0017] As described above, the reinforced stabilization structure for soft soil roadbed is preferably arranged in a pile-connected wall evenly with multiple cement mixing piles when the depth of the soft soil roadbed to be treated is greater than 3 meters or is a soft interlayer section roadbed.

[0018] As described above, for the reinforced stabilization structure for soft soil roadbed, preferably, a plurality of settlement monitoring units are arranged in the roadbed, and the settlement monitoring units include a settlement plate, a ruler and a casing, the ruler is perpendicular to the settlement plate, and the bottom end of the ruler is fixed at the center of the settlement plate, and the casing is arranged on the periphery of the ruler.

[0019] As described above, for the reinforced and stabilized structure for soft soil roadbed, preferably, according to the grouting requirements, a plurality of grouting anchor rods are respectively set to different inclination angles, and a plurality of the implanted steel bars are respectively set to different inclination angles.

[0020] Beneficial effects:

[0021] In this reinforced and stable structure, the soft soil roadbed inside the road is separated from the soft soil roadbed outside the road by the pile-connected wall, which not only prevents the soft soil roadbed outside the road and the groundwater therein from invading the inside of the road, but also the pile-connected wall can act as a frame, which can prevent the roadbed constructed inside the pile-connected wall from collapsing to the outside of the pile-connected wall, thereby ensuring the overall structural stability of the roadbed structure.

[0022] By injecting grouting under the roadbed through grouting anchors, the stratum under the roadbed is solidified as a whole, which plays a role in preventing the roadbed from further sinking; and embedded steel bars are arranged under the roadbed. After grouting under the foundation through the grouting anchors, the slurry spreads, and the embedded steel bars play a supporting role as a steel bar skeleton under the roadbed. The slurry solidifies the embedded steel bars and the grouting anchors, that is, the stratum under the roadbed, the roadbed and the pile-connected wall are anchored and connected as a whole through the grouting anchors and the embedded steel bars, so that the stratum solidified as a whole and the pile-connected wall can play a supporting role for the roadbed, thereby greatly improving the stability of the foundation and avoiding the occurrence of a large limit of settlement of the roadbed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. Among them:

[0024] Figure 1 This is a formal cross-sectional view of a roadbed according to an embodiment of the utility model;

[0025] Figure 2 A top cross-sectional view of a roadbed according to an embodiment of the utility model;

[0026] Figure 3 The figure is a schematic diagram of the arrangement of a settlement monitoring unit according to an embodiment of the utility model.

[0027] In the figure: 1. Roadbed; 2. Pile-connected wall; 3. Grouting anchor rods; 4. Settlement monitoring unit; 5. Implanted steel bars. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the protection scope of the present invention.

[0029] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. The terms "connected" and "connection" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0030] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0031] According to the specific embodiment of the utility model, Figure 1-3 As shown, the utility model provides a strengthening and stabilizing structure for soft soil roadbed, and the strengthening and stabilizing structure includes:

[0032] Pile-connected wall: The pile-connected wall is set at the boundary of the soft soil roadbed occupied by the road, and is used to enclose the soft soil roadbed within the road range.

[0033] The steel bars are implanted and passed through the pile-connected wall to the bottom of the foundation. In this embodiment, a borehole is drilled from one side of the pile-connected wall, and then the implanted steel bars are inserted into the borehole; when the grouting anchor is grouting, the grouting liquid will intrude into the borehole where the steel bars are implanted, and the grouting status is observed through the borehole where the steel bars are implanted to ensure that the grouting liquid is fully injected.

[0034] Grouting anchor rods, which pass through the pile wall and are inserted under the foundation, are used to carry out grouting under the roadbed.

[0035] In this reinforced and stable structure, by constructing a pile-connected wall 2 at the boundary of the soft soil roadbed occupied by the road, the soft soil roadbed inside the road is separated from the soft soil roadbed outside the road by the pile-connected wall 2. This can not only prevent the soft soil roadbed outside the road and the groundwater therein from invading the inside of the road, but the pile-connected wall 2 can also act as a frame, which can prevent the roadbed 1 constructed inside the pile-connected wall 2 from collapsing to the outside of the pile-connected wall 2, thereby ensuring the stability of the roadbed 1 structure.

[0036] Embedded steel bars 5 are arranged below the roadbed 1. After grouting is performed below the foundation 1 through the grouting anchor rods 3, the slurry spreads, and the implanted steel bars 5 play a supporting role as a steel skeleton below the roadbed 1. The slurry condenses and is embedded in the steel bars 5, so that the roadbed is better strengthened and supported.

[0037] In one embodiment of the present application, the pile-connected wall 2 is made of cement mixing piles, and two adjacent cement mixing piles have overlapping and staggered parts. The cement mixing piles are built together to form the pile-connected wall 2, which is not only convenient for construction, but also has a high structural strength, which is beneficial to the stability of the roadbed 1; and the cement mixing piles intersect with each other, which can also play the role of a water retaining wall to prevent water from the periphery of the road from invading the bottom of the roadbed 1.

[0038] In one embodiment of the present application, the pile-connected wall 2 is made of jet grouting piles, two adjacent jet grouting piles have overlapping and staggered parts, and I-beams are inserted into the jet grouting piles. There is at least one jet grouting pile between two adjacent jet grouting piles inserted with I-beams.

[0039] I-beams are permanently inserted into the pile-connected wall 2 constructed by jet grouting piles, which improves the integrity of the pile-connected wall 2, greatly increases the structural strength of the pile-connected wall 2, and makes the pile-connected wall 2 have better water-proof properties. It is suitable for soft soil roadbeds with poor geological conditions and can ensure that the constructed roadbed 1 has better stability.

[0040] Grouting anchor rods are provided through the pile-connected walls on both sides of the soft soil roadbed. Implanted steel bars are provided through the pile-connected walls on both sides of the soft soil roadbed.

[0041] The implanted steel bars penetrate the slurry penetration range of the grouting anchor rods on both sides of the soft soil roadbed; the implanted steel bars on one side of the soft soil roadbed are inserted into the slurry penetration range of the grouting anchor rods on the other side of the soft soil roadbed.

[0042] In one embodiment of the present application, the implanted steel bars on one side are inserted into the slurry penetration range of the grouting anchor rods on the other side, and one implanted steel bar covers the slurry penetration ranges of the two grouting anchor rods at the same time, that is, two adjacent implanted steel bars cross each other; by cooperating with the implanted steel bars and the grouting anchor rods, the bottom of the foundation is connected as a whole, thereby greatly improving the stability of the foundation and avoiding the occurrence of a large settlement of the roadbed.

[0043] In the pile-connected wall, when the depth of the soft soil roadbed that needs to be treated is less than or equal to 3 meters, replacement gravel soil is set in the pile-connected wall, and stone pieces are set at the bottom of the replacement gravel soil.

[0044] In the pile-connected wall, when the depth of the soft soil roadbed to be treated is greater than 3 meters or it is a soft interlayer section roadbed, multiple cement mixing piles are evenly arranged in the pile-connected wall.

[0045] A plurality of settlement monitoring units 4 are arranged in the roadbed. The settlement monitoring units 4 include a settlement plate, a scale and a casing. The scale is perpendicular to the settlement plate, and the bottom end of the scale is fixed at the center of the settlement plate. The casing is sleeved on the periphery of the scale.

[0046] In one embodiment of the present application, a settlement monitoring unit 4 is provided in the entire section of the soft soil roadbed, so that the settlement of the constructed roadbed 1 can be monitored in time. When the settlement of the roadbed 1 is greater than the set value, grouting treatment is carried out under the roadbed 1 in time, and the grouting liquid is solidified under the roadbed 1 in time, so that the rock and soil layer under the roadbed 1 solidifies into a whole, thereby avoiding greater settlement of the roadbed 1, which not only improves the construction quality of the soft soil roadbed, but also greatly reduces the maintenance cost of the soft soil roadbed, so that the soft soil roadbed is better treated.

[0047] In one embodiment of the present application, a settlement plate is provided at the bottom of the ruler, and the settlement plate is pre-buried in the foundation, so that the settlement monitoring unit 4 can more realistically and effectively reflect the settlement of the foundation; and a casing is arranged on the periphery of the ruler to prevent debris from entering the casing, so that the casing protects the ruler, thereby making the ruler easier to observe.

[0048] According to the grouting requirements, the plurality of grouting anchor rods 3 are respectively set to different inclination angles, and the plurality of implanted steel bars 5 are respectively set to different inclination angles.

[0049] In one embodiment of the present application, grouting anchor rods 3 with different inclination angles are arranged so that the grouting anchor rods 3 with different inclination angles can cover a wider range of the strata below the roadbed 1 as much as possible, making it easier to solidify the strata below the roadbed 1 into a whole through slurry, thereby improving the stability of the roadbed 1 and preventing further settlement of the foundation.

[0050] The specific construction steps of the soft soil roadbed using this reinforced stabilization structure are as follows:

[0051] Step 1: clean the ground and stake out the soft soil foundation that the road passes through to circle the soft soil foundation area occupied by the road.

[0052] Step 2: construct a pile-connected wall 2 at the boundary of the soft soil roadbed occupied by the road. The pile-connected wall 2 is used to separate the soft soil roadbed inside the road from the soft soil roadbed outside the road.

[0053] Step 3, treating the soft soil roadbed in the pile-connected wall 2.

[0054] Step 4: pre-embed multiple settlement monitoring units 4 in the entire section of the soft soil roadbed where the road is located.

[0055] Step 5, monitoring the settlement monitoring unit 4 to determine the settlement of the roadbed 1, when the settlement of the roadbed 1 is greater than the set value, performing additional grouting treatment below the roadbed 1.

[0056] In step 5, the supplementary grouting treatment process is to first drill a hole from the outer periphery of the pile-connected wall 2 to the bottom of the roadbed 1, and then insert the embedded steel bar into the drilled hole; then drill a hole again from the outer periphery of the pile-connected wall 2 to the bottom of the roadbed 1, and install the grouting anchor rod 3, and grouting is injected into the bottom of the roadbed 1 through the grouting anchor rod 3.

[0057] In one embodiment of the present application, when the grouting anchor rod is grouting, the slurry will invade the drill hole where the steel bar 5 is implanted. The state of grouting is observed through the drill hole where the steel bar 5 is implanted to ensure that the roadbed below is fully grouted and reinforced. The grouting slurry solidifies the implanted steel bar 5 below the roadbed 1, so that the stratum below the roadbed 1 solidifies as a whole, which plays a role in preventing the roadbed 1 from further sinking; secondly, when the stratum below the roadbed 1 solidifies as a whole, the grouting anchor rod 3 and the implanted steel bar 5 are used to anchor the stratum below the roadbed 1, the roadbed 1 and the pile-connected wall 2 as a whole, so that the stratum solidified as a whole and the pile-connected wall 2 can both play a supporting role on the roadbed 1, thereby greatly improving the stability of the foundation and avoiding the occurrence of a large-scale settlement of the roadbed 1.

[0058] In step 3, when the depth of the soft soil roadbed to be treated is less than or equal to 3 meters, the soft soil roadbed is removed and replaced with crushed stone soil for treatment.

[0059] In one embodiment of the present application, when the thickness of the soft soil roadbed to be treated is small, the amount of replacement construction required is small, and the geological conditions of the original soft soil roadbed can be directly changed, so that the treated roadbed 1 has higher bearing capacity and structural stability.

[0060] When replacing the gravel soil, first remove the soft soil in the pile-connected wall 2, then lay a layer of block stones on the base, backfill the gravel soil in layers above the block stones, and roll it in layers.

[0061] In one embodiment of the present application, the soft soil is excavated to the design elevation, and the next construction step can be carried out only after the base size, plane position, elevation, and foundation bearing capacity are checked and qualified. In areas with abundant groundwater, 0.5-meter-high stone blocks can be laid on the base first, and then backfilled and compacted; backfilling stone blocks can make the base more evenly stressed; the loose paving thickness is determined by process tests. Loose paving is carried out by unloading from the bottom first to the height, from the two sides first to the center, and flattening with a large bulldozer. The compaction machinery uses a vibrating roller with a deadweight of not less than 25 tons.

[0062] During the construction process, the center line and width of the roadbed 1 should be re-measured in time for each height setting. Before the stone-filled embankment is poured, after the current layer is rolled, the next layer can be backfilled after the compaction degree meets the requirements through on-site tests.

[0063] In step 3, when the soft soil roadbed depth is greater than 3 meters or is a soft interlayer section roadbed 1, cement mixing piles are used for treatment construction.

[0064] In one embodiment of the present application, when the soft soil roadbed is thick, the amount of random filling construction is large; however, the use of cement mixing piles is simpler and more convenient, and multiple cement mixing piles are evenly constructed in the soft soil roadbed. The cement mixing piles have a good bearing capacity, which can greatly improve the soft soil roadbed geology and improve the stability of the roadbed 1 structure.

[0065] The construction process of cement mixing piles is as follows: construction equipment, pile driver in place, pre-mixed sinking, shotcrete mixing and lifting, mixing and sinking, shotcrete mixing and lifting again, and moving to the next cement mixing pile construction site.

[0066] In one embodiment of the present application, the cement mixing pile construction process is as follows:

[0067] (1) Construction preparation

[0068] Before construction, according to the design drawings, a convenient line at least 0.5 meters wider than the slope foot line is determined, and the mixing piles are arranged in an equilateral triangle. Before construction, test piles are carried out to determine the parameters of cement mixing piles. During construction, the pile positions are measured and placed according to the calculated mixing pile positions, and wooden piles are used to locate the mixing piles.

[0069] (2) Positioning

[0070] The pile driver uses its own walking system to move, and the tower hoists the cement mixer into place. The cement mixer arrives at the designated pile position and is centered. When the ground is uneven, the hydraulic balance device of the cement mixer is used to keep the lifting equipment level. Check the drill rod length and drill bit diameter, and move the pile foundation to the designated position to align the pile position.

[0071] (3) Preparation of cement slurry

[0072] The cement in cement mixing piles is silicate cement or ordinary silicate cement with a strength of 42.5 or above, the dosage is temporarily set at 18%, the water-cement ratio is temporarily set at 0.45-0.55, and the actual amount is determined according to the results of the on-site pile test. During construction, a quantitative container can be used to control the water consumption. The prepared cement slurry must not have segregation, and the stop time must not exceed 2 hours. If the stop time is too long, it must not be used.

[0073] (4) Pre-stirring and settling

[0074] After the cooling water circulation of the cement mixing pile machine is normal, start the mixing pile machine motor, loosen the mixing pile machine sling, and make the mixing pile machine sink along the guide frame to mix and cut the soil. The sinking speed can be controlled by the motor current monitoring meter. The sinking and lifting speed of the mixer must be strictly controlled during work, and the lifting and sinking speed should be controlled at 0.5-0.8 meters per minute. During construction, record the sinking and lifting time per meter and the hole depth of the mixer.

[0075] (5) Lifting shotcrete

[0076] Lift the drill bit to spray. During the spraying process, the cement slurry is continuously stirred to prevent its segregation, and the spraying amount is automatically recorded by the computer. When the pile top is close to the design elevation, the mixer should be sprayed and stirred from 1 meter below the ground and lifted out of the ground at a slow speed to ensure the quality of the pile head construction. When the mortar reaches the outlet, it should be sprayed and stirred in situ for 30 seconds.

[0077] (6) Stirring and sinking

[0078] After the lifting and spraying is completed, drill again to stir to the bottom of the pile, stop drilling after reaching the bottom of the pile, and keep spraying for 30 seconds. During the sinking process, the working current is not greater than the rated value, and the operation of the equipment and the changes in the bottom layer are observed at any time. The drill bit sinks to the designed depth. Read the size according to the scale marked on the drilling rig to determine whether the designed depth has been reached.

[0079] (7) Increase the mixing of the spraying

[0080] When the mixing is finally lifted to the hole mouth, follow the above-mentioned lifting and spraying mixing operation steps, and lift the drill bit to the ground for mixing. When the drill bit is lifted to 1 meter below the ground, control the lifting speed. When the nozzle is about to come out of the road surface, stop lifting to ensure that the pile head is evenly compacted and prevent uneven damage to the pile body.

[0081] (8) Cleaning

[0082] When the pile driver stops working or the construction interval is too long, add clean water to the cement slurry mixing bucket, start the mortar pump, and clean the remaining cement slurry in all pipes until it is basically clean. And clean the soft soil adhering to the mixing head.

[0083] (9) Displacement

[0084] The pile driver moves to the next pile position and repeats the above steps.

[0085] (10) Pile foundation inspection and pile protection

[0086] Drilling and coring are carried out 28 days after the pile is formed. The sampling frequency is 1%-2% of the total number of piles. The coring position is 2 / 5 of the pile diameter. After processing into the specified size, the unconfined compressive strength test is carried out. At the same time, load tests are carried out to test the bearing capacity of single piles and composite foundations. The sampling frequency is 0.2%-0.5% of the total number of piles, and no less than 3 locations.

[0087] Within 28 days after the cement mixing piles are completed, no large machinery shall be allowed to move in the reinforced area or within a 2-meter radius nearby.

[0088] (11) Pile top roadbed 1 filling

[0089] After the cement mixing pile construction is completed and qualified, a 0.3-meter-thick gravel cushion layer is laid on the top of the pile, and two layers of geogrids are laid, with the ends of the geogrids reversed and the reversed length of 2 meters. Only after the construction is completed can the roadbed 1 earthwork be filled.

[0090] In one embodiment of the present application, in order to ensure that the settlement of the roadbed 1 is controllable, a settlement observation point is set in the entire section of the soft foundation treatment. An observation point is set every 50m along the line direction. Along the cross-sectional direction of the line, 3 settlement observation marks and 4 lateral displacement observation marks are set in each section. The settlement observation point and displacement observation pile are buried during construction. When buried, the bottom groove of the settlement plate should be flat, and a 60*60*20cm sand cushion layer should be laid underneath. The vertical deviation of the measuring rod of the settlement plate should not be greater than 1.4%. The displacement observation pile is buried at the foot of the roadbed 1 and 2m outside the drainage ditch. The settlement observation point consists of a settlement plate and a ruler. The settlement plate is a 50cm×50cm×1cm steel plate, the ruler is a φ40mm steel pipe, and a φ110mm PVC casing is installed on the outside. φ14 reinforcing steel bars are welded between the ruler and the settlement plate. The displacement observation mark consists of a concrete column and a steel nail probe. The lower part is a 0.8m long C20 concrete column, and the upper part is equipped with a 20cm×20cm steel nail probe, which is buried 40cm underground.

[0091] The settlement observation adopts the second-class geometric leveling measurement. The side piles and settlement are observed once a day during the construction period. In the case of sudden changes in settlement, observations are made 2-3 times a day. When the time between two fillings is long, observations are made at least once every 3 days.

[0092] During the filling process, a curve diagram of the relationship between filling height, time, and settlement should be drawn based on the observation results, the lateral displacement value of the soil and its development trend should be analyzed, and the stability of the foundation should be judged. When the ground settlement rate at the center of the embankment is greater than 10mm per day and night, or the horizontal displacement rate at the foot of the slope is greater than 5mm per day and night, the filling should be stopped immediately and the filling should be resumed after the observation value returns to within the limit. After filling to the design elevation, the settlement observation point and the lateral displacement observation pile are observed simultaneously, and the settlement of the roadbed surface 1 is determined by measuring the elevation change of the shoulder observation pile.

[0093] It should be understood that the above description is merely exemplary and the embodiments of the present application do not limit this.

[0094] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. A strengthening and stabilizing structure for soft soil roadbed, characterized in that: The strengthening and stabilizing structure comprises: A pile-connected wall, which is arranged at the boundary of the soft soil roadbed range occupied by the road and is used to surround the soft soil roadbed within the road range; implanting steel bars, wherein the implanted steel bars are inserted through the pile-connected wall into the bottom of the foundation; A grouting anchor rod is inserted through the pile-connected wall to below the foundation, and is used for grouting below the roadbed.

2. The strengthening and stabilizing structure for soft soil roadbed according to claim 1 is characterized in that: The pile-connected wall is made of cement mixing piles, and two adjacent cement mixing piles have overlapping and staggered parts.

3. The strengthening and stabilizing structure for soft soil roadbed according to claim 1 is characterized in that: The pile-connected wall is made of jet grouting piles, two adjacent jet grouting piles have overlapping and staggered parts, and I-beams are inserted into the jet grouting piles. There is at least one jet grouting pile between two adjacent jet grouting piles inserted into the I-beams.

4. The strengthening and stabilizing structure for soft soil roadbed according to claim 1, characterized in that: Grouting anchor rods are installed throughout the pile-connected walls on both sides of the soft soil roadbed.

5. The strengthening and stabilizing structure for soft soil roadbed according to claim 4 is characterized in that: Embedded steel bars are provided throughout the pile-connected walls on both sides of the soft soil roadbed.

6. The strengthening and stabilizing structure for soft soil roadbed according to claim 5, characterized in that: The implanted steel bars penetrate the grouting range of the grouting anchor rods on both sides of the soft soil roadbed; The embedded steel bars on one side of the soft soil roadbed are inserted into the slurry penetration range of the grouting anchor rods on the other side of the soft soil roadbed.

7. The strengthening and stabilizing structure for soft soil roadbed according to claim 1, characterized in that: In the pile-connected wall, when the depth of the soft soil roadbed to be treated is less than or equal to 3 meters, replacement gravel soil is set in the pile-connected wall, and pieces of stone are set at the bottom of the replacement gravel soil.

8. The strengthening and stabilizing structure for soft soil roadbed according to claim 7, characterized in that: In the pile-connected wall, when the depth of the soft soil roadbed to be treated is greater than 3 meters or is a soft interlayer section roadbed, a plurality of cement mixing piles are evenly arranged in the pile-connected wall.

9. The strengthening and stabilizing structure for soft soil roadbed according to claim 1, characterized in that: A plurality of settlement monitoring units are arranged in the roadbed, and the settlement monitoring units include a settlement plate, a ruler and a casing. The ruler is perpendicular to the settlement plate, and the bottom end of the ruler is fixed at the center of the settlement plate, and the casing is sleeved on the periphery of the ruler.

10. The reinforcing and stabilizing structure for soft soil roadbed according to claim 9, characterized in that: According to the grouting requirements, the plurality of grouting anchor rods are respectively set to different inclination angles, and the plurality of implanted steel bars are respectively set to different inclination angles.

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