CN206625096U - A kind of reinforced rubble frame structure subgrade strengthening system - Google Patents

Abstract

The utility model belongs to the field of roadbed reinforcement engineering, and relates to a reinforced gravel frame structure roadbed reinforcement system, comprising a reinforced gravel cushion, embankment filling, reinforced gravel piles, a geocell reinforced gravel layer and a surface layer; the reinforced crushed stone pile is arranged longitudinally between the reinforced crushed stone layer of the geocell and the reinforced crushed stone cushion and is respectively connected with the reinforced crushed stone layer of the geocell and the reinforced crushed stone cushion; the geocell The reinforced crushed stone layer, the reinforced crushed stone pile and the reinforced crushed stone cushion are filled with embankment fill; the surface layer is laid on the upper surface of the reinforced crushed stone layer in the geocell; the reinforced crushed stone cushion, reinforced The gravel pile and the reinforced gravel layer of the geocell are jointly grouted through the pre-embedded grouting pipe to form an overall reinforced gravel frame structure reinforcement system. The utility model provides a reinforced crushed stone frame structure subgrade reinforcement system with reasonable structural mechanical properties, good integrity and anti-seepage performance and high bearing capacity.

Description

A Reinforced Gravel Frame Structure Roadbed Reinforcement System

technical field

The utility model belongs to the field of roadbed reinforcement engineering and relates to a roadbed reinforcement system, in particular to a roadbed reinforcement system with a reinforced gravel frame structure.

Background technique

In recent years, with the rapid development of my country's economy and the country's emphasis on and investment in infrastructure design and construction, road construction is in full swing, and my country's road transportation capacity will be further improved. The improvement of the road traffic system will promote the mutual flow of material resources in various regions, which will greatly promote the development of the national economy.

However, statistics on a large number of common diseases of roads in service show that during the road operation stage, under the long-term vibration and extrusion of vehicle loads, the roadbed is prone to uneven settlement, leading to road surface cracking and other diseases, especially soft soil Road diseases are more prominent in some special soil areas. The appearance of road surface cracks will increase the water seepage capacity of the road surface by orders of magnitude. Under the condition of external rainfall infiltration, rainwater will seep into the roadbed soil through the cracks, which will further lead to the softening of the roadbed filling and the aggravation of road surface subsidence, seriously affecting the normal traffic of the road surface, and even causing A traffic accident happens.

Utility model content

In order to solve the above problems, the utility model provides a reinforced crushed stone frame structure subgrade reinforcement system with reasonable structural mechanical properties, good integrity and anti-seepage performance, and high bearing capacity.

In order to achieve the above object, the utility model adopts the following technical solutions:

A reinforced crushed stone frame structure subgrade reinforcement system, characterized in that: the reinforced crushed stone frame structure subgrade reinforcement system includes reinforced crushed stone cushion, embankment fill, reinforced crushed stone pile, geocell reinforcement crushed stone layer and surface layer; the geocell reinforced crushed stone layer and the reinforced crushed stone cushion are parallel to each other; the reinforced crushed stone pile is longitudinally arranged on the geocell reinforced crushed stone layer and the reinforced crushed stone The cushion layers are respectively connected with the geocell reinforced crushed stone layer and the reinforced crushed stone cushion; the geocell reinforced crushed stone layer is filled with the reinforced crushed stone pile and the reinforced crushed stone cushion There is embankment filling; the surface layer is laid on the upper surface of the geocell reinforced crushed stone layer; the reinforced crushed stone cushion, the reinforced crushed stone pile and the geocell reinforced crushed stone layer are pre-embedded The grout pipes are combined with grouting to form an overall reinforced gravel frame structure reinforcement system.

As a preference, the reinforced gravel cushion used in the utility model includes a geogrid or a geocell and crushed stones filled in the geogrid or the geocell; the geogrid or the geocell is a layer or multiple layers; when the geogrid or geocell is multi-layer, the multi-layer geogrid or geocell are parallel to each other; the maximum particle size of the crushed stone is not more than 100mm; the mud contained in the crushed stone The amount is not more than 5%; the thickness range of the reinforced gravel cushion is 0.3m-1.0m.

As a preference, the tensile strength of the geogrid used in the utility model is not less than 100kN/m; the fracture elongation of the geogrid is not more than 3%; when the geogrid is multi-layered, two adjacent layers The spacing between geogrids is 0.2m to 0.4m.

As a preference, the reinforced gravel pile used in the utility model includes a geogrid sleeve and gravel filled in the sleeve inside the geogrid sleeve; the reinforced gravel pile is multiple; The reinforced gravel piles are arranged in a plum blossom shape, and the distance between two adjacent reinforced gravel piles is 3m to 5m; the pile diameter of the reinforced gravel piles is 0.5m to 1.0m; the geogrid sleeve The maximum particle size of the gravel in the sleeve is not more than 80mm; the mud content of the gravel in the sleeve is not more than 5%; the geogrid sleeve is made of a geogrid with a tensile strength of not less than 30kN/m become.

As a preference, the geocell reinforced gravel layer used in the utility model includes a geocell and gravel filled in the geocell; the tensile strength of the geocell is not less than 150kN/m; the geocell The elongation at break of the cell is not more than 10%; the maximum particle size of the gravel in the geocell is not more than 100mm; the mud content of the gravel in the geocell is not more than 5%; the geocell The thickness of the chamber-reinforced gravel layer is 20cm-50cm.

Advantage of the utility model:

The utility model provides a reinforced crushed stone frame structure subgrade reinforcement system, which comprises a reinforced crushed stone cushion layer, a reinforced crushed stone pile, a geocell reinforced crushed stone layer and a surface layer. Among them, the reinforced crushed stone cushion, reinforced crushed stone pile, geocell reinforced crushed stone layer and surface layer are arranged sequentially from bottom to top; reinforced crushed stone cushion, reinforced crushed stone pile and geocell The reinforced gravel layer is jointly grouted through pre-embedded grouting pipes to form an integral reinforced gravel frame structure reinforcement system. The utility model solves a series of problems such as low bearing capacity of the roadbed and is easy to produce uneven settlement under the action of vehicle load, resulting in cracking of the road surface, etc., significantly improves the overall stability of the roadbed, and enhances the bearing characteristics and anti-seepage performance of the roadbed. The subgrade reinforcement system effectively solves the problems of uneven settlement and serious cracking of the road surface under the long-term action of vehicle loads during the operation of the subgrade, and is economical and practical.

Description of drawings

Fig. 1 is the sectional structure schematic diagram of the subgrade reinforcement system provided by the utility model;

Fig. 2 is the sectional structure schematic diagram of the reinforced gravel cushion layer that the utility model adopts;

Fig. 3 is the plane structure schematic diagram of the reinforced gravel pile that the utility model adopts;

Fig. 4 is the sectional structural representation of the geocell reinforced gravel layer adopted by the utility model;

Fig. 5 is the combined grouting diagram of the reinforced gravel cushion, reinforced gravel pile and geocell reinforced gravel layer adopted by the utility model;

in:

1-reinforced gravel cushion; 2-embankment fill; 3-reinforced gravel pile; 4-reinforced gravel layer in geocell; 5-surface layer; 6-crushed stone; 7-geogrid; 8-geogrid sleeve; 9-geocell; 10-grouting pipe; 11-grouting pump.

detailed description

Referring to Fig. 1, the utility model provides a reinforced gravel frame structure embankment reinforcement system, including reinforced gravel cushion 1, embankment fill 2, reinforced gravel pile 3, geocell reinforced gravel layer 4 and the surface layer 5; the geocell reinforced gravel layer 4 and the reinforced gravel cushion 1 are parallel to each other; the reinforced gravel pile 3 is longitudinally arranged on the geocell reinforced gravel layer 4 and the reinforced gravel cushion The layer 1 is connected with the geocell reinforced crushed stone layer 4 and the reinforced crushed stone cushion layer 1 respectively; the geocell reinforced crushed stone layer 4 is connected with the reinforced crushed stone pile 3 and the reinforced crushed stone cushion layer 1 Filled with embankment fill soil 2; surface layer 5 is laid on the upper surface of geocell reinforced crushed stone layer 4; reinforced crushed stone cushion 1, reinforced crushed stone pile 3 and geocell reinforced crushed stone layer 4 Combined grouting through pre-embedded grouting pipes to form an overall reinforced gravel frame structure reinforcement system.

Among them: the reinforced crushed stone cushion 1 includes a geogrid 7 or a geocell and gravel 6 filled in the geogrid 7 or the geocell, and its structural diagram is shown in Fig. 2; the geogrid 7 or the geocell One or more layers; when the geogrid 7 or the geocell is multi-layered, the multi-layer geogrid 7 or the geocell are parallel to each other; the maximum particle size of the crushed stone 6 is not greater than 100mm; the content of the crushed stone 6 The amount of mud is not more than 5%; the thickness range of the reinforced gravel cushion layer 1 is 0.3m-1.0m.

The tensile strength of the geogrid 7 is not less than 100kN/m; the elongation at break of the geogrid 7 is not more than 3%; when the geogrid 7 is multi-layered, the distance between two adjacent geogrids 7 is 0.2 m ~ 0.4m.

Referring to Fig. 3, the reinforced gravel pile 3 includes a geogrid sleeve 8 and crushed stones filled in the sleeve inside the geogrid sleeve 8; the reinforced gravel pile 3 is multiple; the multiple reinforced gravel The piles 3 are arranged in a quincunx shape, and the distance between two adjacent reinforced gravel piles 3 is 3m to 5m; the pile diameter of the reinforced gravel piles 3 is 0.5m to 1.0m; The maximum particle size of the soil is not more than 80mm; the mud content of the gravel in the sleeve is not more than 5%; the geogrid sleeve 8 is made of a geogrid with a tensile strength of not less than 30kN/m; the geogrid When making the geogrid sleeve 8, if the length of the geogrid is not enough, two adjacent geogrids can be overlapped, and the length of the overlap is not less than 30cm.

Referring to Fig. 4, the geocell reinforced gravel layer 4 includes a geocell 9 and gravel filled in the geocell 9; the tensile strength of the geocell 9 is not less than 150kN/m; the fracture of the geocell 9 The elongation rate is not more than 10%; the maximum particle size of the gravel in the geocell 9 is not more than 100mm; the mud content of the gravel in the geocell 9 is not more than 5%; the reinforced gravel layer 4 of the geocell The thickness is 20cm～50cm.

The grouting fluid used in joint grouting is cement slurry; water glass and UEA expansion agent are mixed into the cement slurry; the weight ratio of water glass to cement slurry is 1% to 3%; the weight ratio of UEA expansion agent to cement slurry is 8% to 10%; the water-cement ratio in the cement slurry ranges from 0.8:1 to 1:1; the grouting pressure during combined grouting is 0.1 to 0.3Mpa.

When reinforcing the subgrade reinforcement system based on the reinforced gravel frame structure provided by the utility model, the reinforcement process is as follows:

1) Use a road roller to compact the base of the foundation in the reinforced section to meet the design compaction requirements;

2) Fill the first layer of six layers of gravel with a thickness of 20cm, and use a smooth roller to statically compact it once. The compaction should meet the foundation coefficient K30 of not less than 140MPa/m. After the static pressure is completed, lay the first layer of geogrid 7 ;

3) Step 2) is repeated, and the subsequent laying of two layers of gravel 6 and two layers of geogrid 7 is completed on the upper surface of the first layer of geogrid 7, and the adjacent two layers of geogrid 7 are laid in a criss-cross pattern, Align with the width, the overlap length is not less than 30cm;

4) Embankment fill 2 shall be filled in layers and compacted layer by layer. The thickness of each layer shall not exceed 30cm. The water content of the fill soil shall be controlled within 2% of the water content. The degree of compaction of each layer shall meet the design and specification requirements. ;

5) After the embankment filling 2 is completed, use a vibrometer to drill holes at the design pile positions, drill holes to the upper surface of the reinforced gravel cushion 1 and clean the holes;

6) Place the geogrid sleeve 8 along the inner side of the hole wall, pre-embed the grouting pipe 10, and insert the grouting pipe 10 into the reinforced crushed stone cushion 1 by 5-10 cm;

7) Fill the gravel in the sleeve in batches into the hole and vibrate until the gravel filling in the hole is completed;

8) Lay geocell 9 close to the upper surface of road embankment fill 2, fill in the gravel in geocell 9 in time after geocell 9 is laid, and form geocell reinforced gravel layer 4;

9) After the construction of the geocell reinforced gravel layer 4 is completed, the grouting pump 11 and the pre-buried grouting pipe 10 are used to grout from bottom to top. The grout pipe 10 completes the grouting of the reinforced gravel cushion 1, the reinforced gravel pile 3 and the geocell reinforced gravel layer 4 in sequence; 5 minutes; when the grout is found to be reversed to the surface, reduce the grouting speed to prevent grouting from the surface due to excessive grouting pressure; if necessary, use the intermittent grouting method for secondary grouting or multiple grouting, intermittent grouting The time is 0.5～1.5h, until the grout fills the geocell reinforced gravel layer 4, and the grouting work is finished;

10) After the grouting fluid solidifies and reaches the expected strength, lay the surface layer 5 formed by asphalt or concrete.

The following is a further description of the reinforced gravel frame structure subgrade reinforcement system of the present invention in conjunction with specific embodiments.

Example 1

Referring to Fig. 1, a reinforced crushed stone frame structure subgrade reinforcement system, the reinforcement system includes a reinforced crushed stone cushion 1, embankment fill 2, reinforced crushed stone pile 3, geocell reinforced crushed stone layer 4 and Topping 5.

Among them, the embankment filling height is 4m, the road width is 16m, and the slope ratio of the subgrade is 1:1.5.

The thickness of the reinforced crushed stone cushion 1 is 60cm, and it is constructed by layered filling method, and the thickness of each layer is 20cm; the reinforcement material is geogrid 7, which meets high strength. Low strain requirements, the tensile strength at 1% elongation is not less than 300kN/m. A layer of geogrid 7 is laid for every layer of crushed stone 6, and three layers are laid in total. The maximum particle size of the crushed stone used in the reinforced crushed stone cushion layer 1 and the reinforced crushed stone layer 4 of the geocell is not greater than 100mm, the maximum particle diameter of the crushed stone used in the reinforced crushed stone pile 3 is not greater than 60cm, and the mud content is not greater than 5%.

The diameter of the reinforced gravel pile 3 is 0.6m, and the transverse spacing is 4m; the tensile strength of the geogrid sleeve 8 is 50kN/m, and the width is 4m.

The thickness of the geocell reinforced gravel layer 4 is 30 cm, the tensile strength of the geocell 9 is 300 kN/m, and the maximum elongation is 5%.

The grouting fluid is 32.5 grade slag cement slurry, mixed with 3% water glass and 9% UEA expansion agent, the water-cement ratio is 1:1, and the grouting pressure is 0.3Mpa.

The construction steps of the reinforced gravel frame structure embankment reinforcement system provided by the utility model are as follows:

A. Use a road roller to compact the base of the foundation in the reinforced section to meet the design compaction requirements.

B. Fill the first layer of six layers of gravel with a thickness of 20cm, and use a smooth roller to statically compact it once. The compaction should meet the foundation coefficient K30 and not less than 140MPa/m. After the static pressure is completed, lay the first layer of geogrid 7 .

C. Repeat step B to complete the subsequent laying of the second layer of crushed stone 6 and geogrid 7. The upper and lower layers of geogrid are laid in a criss-cross pattern, and the widths must be aligned. The overlapping length should not be less than 30cm.

D. Embankment filling 2 shall be filled in layers and compacted layer by layer. The thickness of each layer of loose paving shall not exceed 30cm. The water content of the filling soil shall be controlled within 2% of the optimum water content. requirements.

E. After the filling of embankment 2 is completed, use a vibrator to drill holes at the designed pile positions, drill holes to the upper surface of the reinforced gravel cushion 1 and clean the holes.

F. Place the geogrid sleeve 8 along the inner side of the hole wall, and pre-embed the grouting pipe 10, wherein the grouting pipe is inserted into the reinforced crushed stone cushion 1 by about 5cm.

G. Fill the hole with gravel in batches 6 and vibrate until the gravel filling in the hole is completed.

H. Lay the geocell 9 close to the embankment fill 2, and fill the gravel 6 in time after the geocell 9 is laid.

I. After the construction of the geocell reinforced gravel layer 4 is completed, grouting is carried out from bottom to top through the pre-buried grouting pipe as shown in Figure 5. During the grouting process, the grouting pipe is lifted according to the grouting pressure 10. Complete the grouting of reinforced gravel cushion 1, reinforced gravel pile 3 and geocell reinforced gravel layer 4 in sequence. The grouting work in the lower part should be carried out continuously. When the grouting pressure reaches the designed grouting pressure, the pressure should be stabilized for 3 to 5 minutes; pulp. If necessary, use the intermittent grouting method to perform secondary grouting or multiple grouting. The intermittent grouting time is 0.5 to 1.5 hours until the grout fills the geocell reinforced gravel layer 4 and the grouting work ends.

J. After the grout solidifies and reaches a certain strength, lay asphalt or concrete surface 5.

The utility model provides a reinforced gravel frame structure subgrade reinforcement system, wherein the reinforced gravel cushion 1, the reinforced gravel pile 3 and the geocell reinforced gravel layer 4 are formed by integral grouting Reinforced crushed stone frame structure reinforcement system, the reinforcement system has the advantages of reasonable structural mechanical properties, good integrity and anti-seepage, and high bearing capacity, which significantly improves the overall stability of the subgrade, and enhances the bearing characteristics and anti-seepage of the subgrade. performance. The subgrade reinforcement system effectively solves the problems of uneven settlement and serious cracking of the road surface under the long-term action of vehicle loads during the operation of the subgrade, and is economical and practical.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model without limitation. Anyone who performs equivalent modification or equivalent replacement to the technical solution of the utility model without departing from the purpose and scope of the technical solution of the utility model, All should belong to the scope covered by the utility model patent.

Claims (5)

1. A kind of 1. reinforced rubble frame structure subgrade strengthening system, it is characterised in that：The reinforced rubble frame structure roadbed adds Solid system includes reinforced gravel cushion（1）, embankment filled soil（2）, Reinforced Gravel Pile（3）, geotechnical grid reinforcement metalling（4）And Surface layer（5）；The geotechnical grid reinforcement metalling（4）With reinforced gravel cushion（1）It is parallel to each other；The Reinforced Gravel Pile（3） It is disposed longitudinally on geotechnical grid reinforcement metalling（4）And reinforced gravel cushion（1）Between and it is broken with geotechnical grid reinforcement respectively Rock layers（4）And reinforced gravel cushion（1）It is connected；The geotechnical grid reinforcement metalling（4）With Reinforced Gravel Pile（3）Between with And reinforced gravel cushion（1）With Reinforced Gravel Pile（3）Between be filled with embankment filled soil（2）；The surface layer（5）It is laid on geotechnique Cell compartment reinforced rubble layer（4）Upper surface；The reinforced gravel cushion（1）, Reinforced Gravel Pile（3）And geotechnical grid reinforcement is broken Rock layers（4）Joint slip casting is carried out by built-in slip casting pipe and forms overall reinforced rubble frame structure reinforcement system.
2. 2. reinforced rubble frame structure subgrade strengthening system according to claim 1, it is characterised in that：The reinforced rubble Bed course（1）Including GSZ（7）Or geotechnical grid and it is filled in GSZ（7）Or the rubble in geotechnical grid（6）；Institute State GSZ（7）Or geotechnical grid is one or more layers；The GSZ（7）Or geotechnical grid is when being multilayer, multi-layered Soils Work grid（7）Or geotechnical grid is mutually parallel；The rubble（6）Maximum particle diameter be not more than 100 mm；The reinforced rubble pad Layer（1）Thickness range be the m of 0.3m ~ 1.0.
3. 3. reinforced rubble frame structure subgrade strengthening system according to claim 2, it is characterised in that：The GSZ （7）Tensile strength be not less than 100 kN/m；The GSZ（7）Fracture elongation be not more than 3%；The GSZ （7）For multilayer when, adjacent two layers GSZ（7）Between spacing be the m of 0.2 m ~ 0.4.
4. 4. reinforced rubble frame structure subgrade strengthening system according to claim 3, it is characterised in that：The reinforced rubble Stake（3）Including GSZ sleeve（8）And it is filled in GSZ sleeve（8）Rubble in internal sleeve；The reinforcement is broken Stone mar（3）It is more；More Reinforced Gravel Piles（3）Into quincunx arrangement, adjacent two Reinforced Gravel Piles（3）Stake spacing be 3m ~5 m；The Reinforced Gravel Pile（3）Stake footpath be the m of 0.5 m ~ 1.0；The GSZ sleeve（8）The maximum grain of interior rubble Footpath is not more than 80 mm；The GSZ sleeve（8）It is made up of GSZ of the tensile strength not less than 30 kN/m.
5. 5. the reinforced rubble frame structure subgrade strengthening system according to claim 1 or 2 or 3 or 4, it is characterised in that：Institute State geotechnical grid reinforcement metalling（4）Including geotechnical grid（9）And it is filled in geotechnical grid（9）In rubble；The geotechnique Cell compartment（9）Tensile strength be not less than 150 kN/m；The geotechnical grid（9）Fracture elongation be not more than 10%；The geotechnique Cell compartment（9）In the maximum particle diameter of rubble be not more than 100 mm；The geotechnical grid reinforcement metalling（4）Thickness be 20 cm ~50 cm。