CN102322055A

CN102322055A - Construct and construction method of preventing pavement around manhole from subsiding

Info

Publication number: CN102322055A
Application number: CN201110178118A
Authority: CN
Inventors: 黎晓林; 苏国宏; 胡斌; ***
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-06-29
Filing date: 2011-06-29
Publication date: 2012-01-18

Abstract

The invention relates to a construct and a construction method of preventing a pavement around a manhole from subsiding, which belong to the field of urban road projects and relate to a road structure and a method of strengthening the pavement around the manhole. The construct mainly comprises the manhole, grouting pipes, cushion caps and bar mat reinforcements, wherein the grouting pipes are arranged at the external side of the manhole circularly; the cushion caps are supported on the grouting pipes; cement paste is injected into the grouting pipes so that soil is solidified and the density of the soil is improved; the cement paste which permeates through the soil is in a capillary shape and is distributed around the grouting pipes so that the friction force between the grouting pipes and the soil is improved; and a basement layer and a surface layer of a road are supported by the grouting pipes and the cushion caps so that the pavement does not settle. The construction quality of the road is ensured; the settlement of the pavement around the manhole is effectively prevented; the driving safety is ensured; and the maintenance cost of the pavement is reduced through the construct and the construction method of preventing the pavement around the manhole from subsiding.

Description

Prevent the manhole structure and the job practices of roadbed subsidence on every side

Technical field

The present invention relates to a kind of the manhole structure and job practices of roadbed subsidence on every side of preventing, belong to the urban road engineering field, particularly reinforce the manhole structure and the job practices on road surface on every side.

Background technology

Underground utilities under the urban road are important component parts of urban infrastructure; Various underground utilities need certain safe spacing underground burying underground; The width that all is embedded in sidewalk under the sidewalk can not meet the demands, and therefore, (GB289-98) stipulate " Code for comprehensive planning of urban engineering pipeline "; " planned position of utilities pipeline below road should be arranged in below sidewalk or the nonmotorized vehicle lane.Utilities pipelines such as communication cable, feedwater water delivery, combustion gas gas transmission, dirty rain-water drainage can be arranged in below nonmotorized vehicle lane or the motorway ".Therefore, when carrying out the urban road design, generally storm sewer and sewage conduct are arranged under nonmotorized vehicle lane or the motorway, various pipelines need be provided with manhole at a certain distance, so that maintenance.Because during the pipeline groove backfill construction; Compacting machinary can not be close to manhole and roll, and banketing around the manhole is difficult to compacting, through sedimentation after a while; Come to nothing under the road structure around the manhole; Sedimentation phenomenon appears on every side in manhole easily that be arranged in nonmotorized vehicle lane or motorway, the comfortable and traffic safety of influence driving, and this is one of ubiquitous disease of urban road.

Summary of the invention

The purpose of this invention is to provide a kind of the manhole structure and job practices of roadbed subsidence on every side of preventing, the backfill leakiness causes the roadbed subsidence problem around the solution prior art manhole.Beneficial effect is: through the uncompacted soil of backfill around the manhole is reinforced, guarantee the construction quality of road, prevent manhole roadbed subsidence on every side effectively, guarantee traffic safety, reduce the pavement maintenance expense.

The present invention realizes through following technology:

Prevent the manhole structure of roadbed subsidence on every side, mainly comprise manhole 1, Grouting Pipe 2, cushion cap 3, steel mesh reinforcement 4.Described Grouting Pipe 2 is looped around the outside of manhole 1 and arranges that cushion cap 3 is supported on the top of Grouting Pipe 2, is furnished with aperture on Grouting Pipe 2 tube walls, and top is stretched in the cushion cap 3, with steel mesh reinforcement 4 welding.Cushion cap 3 ringwise, around the outside of manhole 1, be positioned at roadbase 6 below.In Grouting Pipe 2, inject cement paste; Cement paste is through in the uncompacted soil of backfill around the infiltration of the aperture on the Grouting Pipe 2 manhole 1, and the cement paste that infiltrates soil is capillary, is covered with around Grouting Pipe 2; Increased the frictional force of Grouting Pipe 2 with soil; Fill up fixed cement paste in the Grouting Pipe 2, form with the capillary channel of radiation towards periphery 5 and have the very root pile of high-bearing capacity, earth consolidation has been improved the compactness of soil.Because the soil around the manhole 1 is by fixed, and there are the support of Grouting Pipe 2 and cushion cap 3 in laying road basic unit 6 and surface course 7 on the top of cushion cap 3, and the road surface sedimentation can not occur again, and Fig. 1 is seen in the structure signal.

Description of drawings

Fig. 1 prevents the manhole organigram of roadbed subsidence on every side;

Fig. 2 is the A-A sectional drawing of Fig. 1;

Fig. 3 is the B-B sectional drawing of Fig. 1;

Fig. 4 prevents the manhole structure construction sketch map of roadbed subsidence on every side.

Among the figure: the 1-manhole, the 2-Grouting Pipe, the 3-cushion cap, the 4-steel mesh reinforcement, the 5-capillary channel, the 6-roadbase, the 7-surface course, the 8-cannelure, the 9-injected hole, the 10-filler, 11-seals, 12-high-pressure hose, 13-threeway.

The specific embodiment

When pipeline groove is backfilled to the bottom surface absolute altitude of roadbase 6; Dig out a cannelure 8 in the periphery of manhole 1, cannelure 8 internal diameters are identical with the external diameter of manhole 1, and external diameter increases by 1000 millimeters in the outside of internal diameter; Be 1000 millimeters of ring widthes, 250 millimeters of the degree of depth of cannelure 8.The centre of cannelure 8 is uniformly distributed with six injected holes 9 around manhole 1, and injected hole 9 adopts rig boring, 100 millimeters in aperture, and the degree of depth gets final product near the shaft bottom.In each injected hole 9, put into a Grouting Pipe 2, Grouting Pipe 2 adopts the steel pipe processing of 25 millimeters of diameters, and the bottom will be shut, and on the tube wall of Grouting Pipe 2, whenever is uniformly distributed with at a distance from 100 millimeters and bores four 5 millimeters aperture, and the top mantle fiber of Grouting Pipe 2 is so that connect grouting pump.Grouting Pipe 2 is put into injected hole 9, and filler 10 is inserted in the slit of Grouting Pipe 2 peripheries, and filler 10 adopts sand gravel, and the 200 millimeters scopes in aperture seal 11 with concreting, and cloth hole and injected hole setting are seen Fig. 2, Fig. 4.

After waiting to seal 11 concrete settings, through threeway 13 branches six Grouting Pipe 2 are connected with grouting pump with high-pressure hose 12, slip casting in six Grouting Pipe 2 simultaneously, cement paste is pressed in the hole of soil by the high pressure of grouting pump.After treating that cement paste solidifies, the steel mesh reinforcement of making 4 is placed in the cannelure 8, Grouting Pipe 2 and steel mesh reinforcement 4 firm welding are seen Fig. 3, adopt concreting cushion cap 3.The concrete of cushion cap 3 reaches builder's road basic unit 6 and surface course 7 after the intensity, sees Fig. 1.

The injecting paste material slurry adopts the cement, flyash compound, cement: flyash=1:0.25～0.5, and pressure and the two controls of grouting amount are adopted in slip casting control, and grouting pressure is controlled at 0.8～1.5Mpa, and grouting amount calculates according to the porosity of the volume of reinforcing soil, soil to be confirmed.

Claims

1. one kind prevents the manhole structure of roadbed subsidence on every side; Mainly comprise manhole (1), Grouting Pipe (2), cushion cap (3), steel mesh reinforcement (4); It is characterized in that: described Grouting Pipe (2) is looped around the outside of manhole (1) and arranges that cushion cap (3) is supported on the top of Grouting Pipe (2).

2. the manhole structure of roadbed subsidence on every side that prevents according to claim 1, it is characterized in that: be furnished with aperture on described Grouting Pipe (2) tube wall, top is stretched in the cushion cap (3), welds with steel mesh reinforcement (4).

3. the manhole structure of roadbed subsidence on every side that prevents according to claim 1; It is characterized in that: described cushion cap (3) ringwise, around the outside of manhole (1), be positioned at roadbase (6) below; In establish steel mesh reinforcement (4), adopt concreting.

4. one kind prevents the manhole job practices of the structure of roadbed subsidence on every side; It is characterized in that: adopt rig to bore injected hole (9) on every side at manhole (1); In injected hole (9), put into Grouting Pipe (2); Filler (10) is inserted in the slit of Grouting Pipe (2) periphery, and the 200 millimeters scopes in aperture are sealed (11) with concreting.

5. a kind of manhole job practices of the structure of roadbed subsidence on every side that prevents according to claim 4, it is characterized in that: pressure and the two controls of grouting amount are adopted in slip casting in Grouting Pipe (2), slip casting.

6. a kind of manhole job practices of the structure of roadbed subsidence on every side that prevents according to claim 4; It is characterized in that: Grouting Pipe (2) and steel mesh reinforcement (4) firm welding; Adopt concreting cushion cap (3), go up builder's road basic unit (6) and surface course (7) at cushion cap (3).