CN212801050U

CN212801050U - Municipal administration road bad soil foundation stabilization structure

Info

Publication number: CN212801050U
Application number: CN202021025180.6U
Authority: CN
Inventors: 曹阳; 郭涛; 刘国春; 任清顺; 黎朝; 何依迹; 王宇; 王伟; 胡治龙; 万亚玲; 郭芸杉; 彭磊; 吴富强; 袁贤荣
Original assignee: Sichuan Southwest Jiaoda Civil Engineering Design Co ltd
Current assignee: Sichuan Southwest Jiaoda Civil Engineering Design Co ltd
Priority date: 2020-06-06
Filing date: 2020-06-06
Publication date: 2021-03-26
Anticipated expiration: 2030-06-06

Abstract

The bad soil foundation of town road consolidates the structure to furthest guarantees road bed compactness, stability and bearing capacity. The soil replacement and filling device comprises a roadbed filled on the ground, wherein a shallow layer replacement and filling layer is arranged below the roadbed, and a grouting reinforcement layer formed by pressure injection of cement slurry and soil body particle cementation into an undisturbed soil layer through grouting holes is arranged below the shallow layer replacement and filling layer. The roadbed in the thick-layer miscellaneous filling road section of the urban road is processed in a mode of combining deep grouting and shallow replacement filling, so that the compactness, stability and bearing capacity of the roadbed can be ensured to the maximum extent, and the strength of the roadbed is obviously improved.

Description

Municipal administration road bad soil foundation stabilization structure

Technical Field

The utility model relates to a town road subgrade, in particular to town road soil foundation stabilization structure that harms.

Background

In the design and construction of road engineering, the compaction and treatment of non-soft foundation road sections (such as miscellaneous filling soil and the like) lack sufficient attention, so that the problem of post-construction settlement is caused, thick-layer miscellaneous filling soil has great harmfulness to highway subgrade, especially is used as a road embankment base part, and if the treatment is improper, the strength and the stability of the base are insufficient, the base is unstable, post-construction settlement and even collapse are caused, and the use function and the driving safety of roads are further influenced.

With the continuous development of cities, road networks such as secondary roads, branches and the like around mature plots are continuously perfected, but poor soil layers such as newly filled soil, miscellaneous filled soil, plain filled soil and the like are frequently formed in roadbed upper covering soil layers in the construction process. The poor soil has the characteristics of complex filling components, loose structure, low basic allowable value of bearing capacity, poor mechanical uniformity and the like, and in view of the characteristics that the depth of some poor soil is thick and buildings on two sides of a road are formed, the depth requirement cannot be met by conventional filling and replacing treatment, and the measures such as dynamic compaction, pile foundation composite foundation treatment and the like have great influence on peripheral buildings; if a conventional direct grouting method is adopted, the implementation of municipal road matching pipelines is inconvenient.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a municipal road bad soil foundation stabilization structure is provided to furthest guarantees road bed compactness, stability and bearing capacity, is showing and is improving road bed intensity.

The utility model provides a technical scheme that its technical problem adopted as follows:

the utility model discloses a bad soil foundation reinforcement structure of town road, including filling the road bed on above-ground, characterized by: a shallow layer backfill layer is arranged under the ground below the roadbed, and a grouting reinforcement layer formed by pressure injection of cement slurry and soil body particle cementation into an undisturbed soil layer through grouting holes is arranged below the shallow layer backfill layer.

The cross section of the shallow layer backfill layer is in an inverted trapezoid shape and consists of a sand gravel backfill part and qualified soil backfill parts on two transverse sides; the cross section of the sand gravel backfilling part is trapezoidal, and the roadbed is located on the top surface of the sand gravel backfilling part; the cross section of the qualified soil backfilling part is in an inverted triangle shape and is filled outside the sand gravel backfilling part.

The utility model has the advantages that the roadbed in the thick-layer miscellaneous filling section of the urban road is treated by combining deep grouting and shallow replacement filling, so that the compactness, stability and bearing capacity of the roadbed can be ensured to the maximum extent, and the strength of the roadbed is obviously improved; only the bad soil body with local depth is processed, so that the foundation processing requirement is met, and the road construction cost is favorably reduced; the construction has little influence on buildings and residents around the road, and the construction is fast.

Drawings

The specification includes the following two figures:

FIG. 1 is a sectional view of the municipal road poor soil foundation reinforcement structure of the utility model;

FIG. 2 is a schematic diagram of the arrangement of grouting holes in the municipal road poor soil foundation reinforcing structure of the invention;

the figures show the components and corresponding references: the device comprises a roadbed 10, a ground surface D, a gravel backfilling part 21, a qualified soil backfilling part 22, a grouting reinforcing layer 30 and grouting holes 31.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

Referring to fig. 1, the utility model discloses a bad soil foundation reinforcement structure of town road, including filling the road bed 10 on ground D. A shallow layer backfill layer is arranged below the roadbed 10 and below the ground D, and a grouting reinforcement layer 30 formed by pressure injection of cement slurry and soil body particle cementation into an undisturbed soil layer through grouting holes 31 is arranged below the shallow layer backfill layer. The roadbed at the thick-layer miscellaneous filling road section of the urban road is treated in a mode of combining deep grouting with shallow replacement filling, so that the compactness, stability and bearing capacity of the roadbed can be ensured to the maximum extent, the strength of the roadbed is obviously improved, the foundation treatment requirement is met only by treating bad soil at local depth, and the construction cost of the road is favorably reduced; the construction has little influence on buildings and residents around the road, and the construction is fast.

Referring to fig. 1, the cross section of the shallow backfill layer is in an inverted trapezoid shape and is composed of a sand gravel backfill part 21 and qualified soil backfill parts 22 at two transverse sides. The cross section of the sand gravel backfilling part 21 is trapezoidal, and the roadbed 10 is located on the top surface of the sand gravel backfilling part 21. The cross section of the qualified soil backfilling part 22 is in an inverted triangle shape and is filled outside the sand gravel backfilling part 21. The depth of the shallow backfill layer is usually 1-3 m.

Referring to fig. 2, the grouting holes 31 are arranged in a quincunx shape on the undisturbed soil layer plane.

The utility model discloses a construction steps of town road bad soil foundation reinforcement structure is as follows:

firstly, constructing a grouting reinforcement layer 30:

measuring and paying off, lofting according to the size of a plane layout drawing and a section drawing of the grouting holes 31, controlling the spacing error within 10cm, and clearly marking, wherein the planes of the grouting holes 31 are uniformly distributed according to a quincunx, and the hole spacing is 1.5 m;

accurately positioning a drilling machine according to the position of a site measuring point, and correcting the verticality of a drill rod, wherein the vertical deviation is less than 1%, the diameter of a final hole is not less than 91mm, and the depth of the hole is 2 m;

and (4) burying the pipe, namely inserting the processed grouting pipe 31 with the diameter of 40mm into the formed hole, and filling concrete into the hole to seal the hole.

Grouting, wherein the grouting sequence is that edge holes are firstly grouted, then middle holes are grouted, grouting is carried out in the same row, and the holes are constructed at intervals (at least two holes). The slurry is single-liquid grouting mainly comprising pure cement, the cement is ordinary portland cement, and the water cement ratio is 0.6: 1-1: 1. the grouting pressure is 0.2-0.4 Mpa (reading of an orifice pressure gauge), and the final injection pressure is 0.2-0.5 Mpa;

cleaning and removing, filling (sealing) the hole with mortar after grouting is finished, wherein the sealing depth is not less than 30cm, and moving to the next hole for grouting after final setting;

and (3) detecting the grouting effect, wherein the grouting foundation is required to reach a CBR (cubic boron reactor) of not less than 2% and a compaction degree of not less than 90%.

And secondly, after grouting reinforcement, pre-pressing the foundation with the miscellaneous filling soil to 92% of compactness, and performing next shallow layer filling layer replacement construction after detection is qualified. The shallow layer is changed and is filled the layer and is given first place to mechanical work, and the earthwork adopts excavator to dig dress, the tipper transportation, and the loader is leveled, and the vibrated roller is compacted.

The shallow layer is preferably filled with coarse-grained soil with good gradation, when the roadbed is filled with different fillers, the roadbed is filled with different fillers in layers, each horizontal layer is filled with the same type of fillers, the usable fillers are removed from the upper layer of the roadbed grouting reinforcement section, the ultra-large-grain-size soil blocks in the horizontal layer need to be mechanically decomposed and reduced, the maximum grain size is less than 150mm, and then the ultra-large-grain-size soil blocks can be used.

And (5) filling construction, wherein the filling is constructed according to longitudinal subsection and transverse layering. The maximum loose paving thickness is controlled to be 40cm during filling, and the design width of the roadbed should be widened by 50cm at two sides of the filling width. In filling construction, each layer is marked by adopting a square grid for line drawing and paving. In the construction process, a specially-assigned person commands the dump truck to dump materials, the materials are horizontally layered, the materials are firstly discharged from the low side, then discharged from the high side, and then discharged from the two sides and then discharged from the center, so that each square grid is enabled to dump the materials, and the materials are paved and pushed flat by a loader after the materials reach a certain amount.

The above is only used for illustrating some principles of the municipal road bad soil foundation reinforcement structure, and the utility model is not limited to the specific structure and the application scope shown and described, so all corresponding modifications and equivalents that may be utilized all belong to the patent scope applied by the utility model.

Claims

1. Bad soil foundation reinforcement structure of town road is including road bed (10) of filling on ground (D), characterized by: a shallow layer backfill layer is arranged below the roadbed (10) and below the ground (D), and a grouting reinforcement layer (30) formed by pressure injection of cement slurry and cementation of soil body particles into an undisturbed soil layer through grouting holes (31) is arranged below the shallow layer backfill layer.

2. The municipal road poor soil foundation reinforcement structure according to claim 1, wherein: the cross section of the shallow layer backfill layer is in an inverted trapezoid shape and consists of a sand gravel backfill part (21) and qualified soil backfill parts (22) at two transverse sides; the cross section of the sand gravel backfilling part (21) is trapezoidal, and the roadbed (10) is located on the top surface of the sand gravel backfilling part (21); the cross section of the qualified soil backfilling part (22) is in an inverted triangle shape and is filled outside the sand gravel backfilling part (21).

3. The municipal road poor soil foundation reinforcement structure according to claim 1 or 2, wherein: the depth of the shallow layer filling layer is 1-3 m.

4. The municipal road poor soil foundation reinforcement structure according to claim 1, wherein: the grouting holes (31) are distributed on the plane of the undisturbed soil layer in a plum blossom shape.