High fill subgrade connection method

A high fill and roadbed technology, applied in the directions of roads, roads, buildings, etc., can solve the problems of insignificant reduction in the amount of foundation treatment, it is difficult to ensure that the old pavement does not crack, and the driving safety is affected, so as to save the construction period, The effect of saving arable land resources and clear force

Inactive Publication Date: 2012-02-22
HENAN PROVINCIAL COMM PLANNING & DESIGN INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This widening technology is based on the above-mentioned technical scheme, and by setting up inclined retaining walls 9 on the downslope, it achieves the purpose of saving land, shortening the construction period, and reducing the difficulty of compacting some filling layers. However, the foundation treatment project The reduction of the amount is not obvious, and there is also the additional settlement effect of the settlement of the new roadbed 2 on the old roadbed 1. It is difficult to ensure that the old road surface does not crack when the filling is high.
[0006] Since it is difficult to avoid the influence of the subsidence settlement of the new widened subgrade on the old road when the

Method used

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Examples

Experimental program
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Example Embodiment

[0026] Example 1

[0027] image 3 Shown is the method for splicing new and old roadbeds by setting up an inclined retaining wall on the upper slope. It is to carry out digging and pouring concrete pile treatment and supporting structure construction near the upper 8m platform of the high fill. That is, the old roadbed 1 is excavated longitudinally on the side slope of the old roadbed 1 according to the inner slope rate of the supporting structure, and the slope is supported 13 to ensure the stability of the slope, and then the bored pile 12 is constructed according to the conventional method. The pile diameter is generally 0.8 to 1.6 meters, and the pile length and longitudinal pile spacing need to be determined in accordance with the bearing capacity requirements of the supporting structure. The conventional pile side friction resistance and cone tip resistance meet the bearing capacity requirements. The longitudinally isolated bored cast-in-place piles 12 are connected to the...

Example Embodiment

[0035] Example 2

[0036] Figure 4 Shown is the method of setting up a counterweight retaining wall on the upper slope to rewind the new and old subgrade. This is on the basis of the scheme of Embodiment 1. Due to the larger volume of the counterweight retaining wall, more excavation of the old roadbed 1 is required. Therefore, in order to ensure the stability of the excavation of the old roadbed 1, it is necessary to lay a 20-28mm diameter anchor rod on the slope to be excavated before excavation, and the top of the anchor rod exposes the steep slope 5cm on the inner side of the retaining wall. After excavating the old roadbed from top to bottom with slope rate, the anchor rod head hanging diameter ≥8mm, mesh size 20x20cm reinforced mesh and spraying 8~10cm C20 concrete support plan immediately exposed on the excavated slope surface will ensure During the construction of the retaining wall, the slope surface is stable, and after the foundation treatment is qualified, the grave...

Example Embodiment

[0037] Example 3

[0038] Figure 5 Shown is the method of splicing new and old roadbeds by setting up buttressed retaining walls on the upper slope. It is based on the schemes of Example 1 and Example 2, and the construction of C25 reinforced concrete buttress retaining wall 9 is carried out. Due to the light weight of the retaining wall, the requirement for the foundation bearing capacity is relatively low, and the amount of foundation treatment under the wall bottom plate is less than that of Examples 1 and 2. Steep slope excavation and support are the same as in Example 2, and the others are the same as in Example 1.

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Abstract

The invention discloses a high fill road section connection method, comprising the steps of: conducting bored pile (12) construction vertically at a side slope of an old subgrade (1), connecting multiple bored piles (12) into a vertically continuous bearing platform by means of a reinforced concrete supporting beam (11), the top surface of which is paved with a hardcore bed (10), and carrying out retaining wall (9) construction on the hardcore bed, when the retaining wall strength reaches over 75% of a designed strength level, performing cut slope (5) and step (6) excavation construction to the old subgrade slope, implementing filler (7) filling layer by layer and layering compaction, and finally paving newly connected wide pavement (4). The method of the invention restrains lateral deformations of a new subgrade (2) by means of various supporting and retaining structures, and opposes vertical deformations caused by various loads through a foundation reinforcing structure formed by the bored piles (12) and the reinforced concrete supporting beam (11), thus reaching the purposes of a stable overall structure and usage requirement satisfiable deformations.

Description

technical field [0001] The invention belongs to the technical field of roadbeds and railways, and mainly relates to a splicing method for high-filling roadbeds. Background technique [0002] At present, in highway and railway subgrade reconstruction and expansion projects, the main schemes adopted are: double-sided splicing, single-side widening and separated subgrade. [0003] Double-sided splicing has the advantages of less land occupation, large traffic capacity, and cost savings. It has been fully applied in the reconstruction and expansion of expressways in plain micro-hilly areas and some mountainous areas. However, the original expressway was limited by the design guidelines and economic conditions at that time, and there were many high-fill road sections, so it was difficult to implement the double-sided widening method. [0004] figure 1 Shown is a commonly used high-fill embankment double-sided widening technology. This widening technology is to remove the plowi...

Claims

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Application Information

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IPC IPC(8): E01C3/00
Inventor 汤意韩文涛高啸雁李雯
Owner HENAN PROVINCIAL COMM PLANNING & DESIGN INST CO LTD
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