CN215105237U - A fold and cross shield tunnel house foundation reinforced structure for being close to house - Google Patents

Abstract

A kind of foundation reinforced structure of the house of the overlapping shield tunnel used for next-door neighbour's house, relate to the tunnel construction field, including the house, the municipal administration main road, the pedestrian's foot way located between house and the municipal administration main road, bury the municipal pipeline under the pedestrian's foot way, the house foundation grouting area located under the pedestrian's foot way, close to the house, the antecedent shield tunnel located under the grouting area of house foundation, the antecedent tunnel deep hole grouting area located above the antecedent shield tunnel, the backward shield tunnel located above the deep hole grouting area of the antecedent tunnel, and the backward tunnel deep hole grouting area located around the backward shield tunnel; the leading shield tunnel and the trailing shield tunnel are mutually overlapped tunnels. The utility model provides a prior art construction degree of difficulty and risk are very big, and control is improper, easily leads to the house slope to collapse, the pipeline destroys, the road fracture waits important accident, produces extremely abominable social influence and economic loss's problem.

Description

A fold and cross shield tunnel house foundation reinforced structure for being close to house

Technical Field

The utility model relates to a tunnel construction field especially relates to an overlap shield tunnel house foundation reinforced structure for next-door neighbour's house.

Background

With the rapid development of economy and the soaring of the infrastructure industry, more and more subway plans are examined and approved, the corresponding subway density is higher and higher, the construction environment is more and more complex, and the construction difficulty and the risk are higher and higher along with the increase of the subway density and the increase of the construction environment. In urban subway line planning, factors such as difficulty in removing ground structures and cost of clearing underground obstacles need to be considered, so that more and more subway line selection spaces are smaller and smaller, overlapping shield tunnels close to houses often appear, and particularly small-radius curve overlapping shield tunnels avoiding obstacles appear. The small-radius curve overlapping shield tunnel similar to the adjacent house has great construction difficulty and risk, is improperly controlled, easily causes serious accidents such as house inclination collapse, pipeline damage, road cracking and the like, and generates extremely bad social influence and economic loss.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a fold and intersect shield tunnel house foundation reinforced structure for next-door neighbour's house solves the prior art construction degree of difficulty and risk very big, and control is improper, easily leads to the house slope to collapse, pipeline destruction, road fracture etc. major accident, produces extremely abominable social influence and economic loss's problem.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a kind of foundation reinforced structure of the housing of the overlapping shield tunnel used for next-door neighbour's house, including the house, the municipal main road, the pedestrian's access road located between house and municipal main road, the municipal pipeline buried under the pedestrian's access road, the house foundation grouting area located under the pedestrian's access road, close to the house, the antecedent shield tunnel located under the grouting area of house foundation, the antecedent tunnel deep hole grouting area located above the antecedent shield tunnel, the backward shield tunnel located above the antecedent tunnel deep hole grouting area, and the backward tunnel deep hole grouting area located around the backward shield tunnel; the leading shield tunnel and the trailing shield tunnel are mutually overlapped tunnels.

The house foundation grouting area comprises a rectangular grouting area located on the outer side of the house and a fan-shaped grouting area located right below the house.

And grouting in a grouting area of the house foundation by using sleeve valve pipes.

Further preferred technical solution: the sleeve valve pipe is made of PVC material.

Further preferred technical solution: grouting of the sleeve valve pipe is segmented grouting, and a grouting area of the house foundation is positioned outside a shield tunneling range.

Further preferred technical solution: the tunneling process of the shield tunnel is synchronized with the primary grouting, and secondary grouting is performed after tunneling is finished.

Further preferred technical solution: in the deep hole grouting area of the advanced tunnel, the longitudinal section is in a sector ring shape with a central angle of 180 degrees.

Further preferred technical solution: and the tunneling process of the backward shield tunnel is synchronous with the primary grouting, and secondary grouting is performed after tunneling is finished.

Further preferred technical solution: and the longitudinal section of the deep hole grouting area of the backward tunnel is in a circular ring shape.

Compared with the prior art, the utility model has the following characteristics and beneficial effect:

1, the utility model discloses a carry out the slip casting to the house ground and consolidate, furthest reduces the secondary disturbance that the fold shield tunnel produced the house ground, slows down the risk that house fracture, slope, collapse, reduces because of the huge economic loss that house removal, resident vacate the production.

2, the utility model discloses house foundation reinforcement adopts sleeve valve pipe technology, and the defect of slip casting steel pipe can be avoidd to PVC material slip casting sleeve valve pipe, and the improper invasion tunnel scope of chemical decomposition slip casting hole site control shield constructs the risk that the blade disc can't cut.

3, the utility model discloses a sleeve valve pipe slip casting can be according to its characteristic of segmentation slip casting, consolidates the regional location with the slip casting outside the shield tunnelling scope, has avoided the shield to tunnel the inhomogeneity of regional soil layer intensity to bias voltage state has been produced, the increase shield constructs the degree of difficulty of attitude control.

4, the utility model discloses shield tunnel deep hole slip casting in advance forms peripheral soil layer reinforcement body, and furthest's reduction backward tunnel is to the emergence of preceding tunnel deformation, displacement, avoids the destruction of shield tunnel in advance, can avoid the influence of subsiding to backward tunnel and ground house after the worker simultaneously.

5, the utility model discloses the soil layer reinforcement body that backward shield tunnel deep hole slip casting formed avoids subsiding because of the after-construction that the shield structure construction produced furthest, and then reduces the after-construction subsides and the fracture in ground house.

Drawings

Figure 1 is the utility model discloses a fold intersection shield tunnel house foundation reinforced structure's for close proximity house section schematic diagram.

Reference numerals: the method comprises the following steps of 1-municipal pipeline, 2-house, 3-pedestrian sidewalk, 4-house foundation grouting area, 5-advanced shield tunnel, 6-advanced tunnel deep hole grouting area, 7-backward shield tunnel, 8-backward tunnel deep hole grouting area and 9-municipal trunk road.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1, the overlapped shield tunnel house foundation reinforcing structure for the adjacent house comprises a house 2, a municipal trunk 9, a pedestrian access 3 between the house 2 and the municipal trunk 9, a municipal pipeline 1 buried under the pedestrian access 3, a house foundation grouting area 4 under the pedestrian access 3 and near the house 2, a preceding shield tunnel 5 under the house foundation grouting area 4, a preceding tunnel deep hole grouting area 6 above the preceding shield tunnel 5, a following shield tunnel 7 above the preceding tunnel deep hole grouting area 6, and a following tunnel deep hole grouting area 8 around the following shield tunnel 7; the leading shield tunnel 5 and the trailing shield tunnel 7 are mutually overlapped tunnels.

The house foundation grouting area 4 is subjected to grouting through sleeve valve pipes and comprises a rectangular grouting area located on the outer side of the house 2 and a fan-shaped grouting area located right below the house 2; the sleeve valve pipe is made of PVC material.

In order to prevent the degree of disturbance and damage to the house foundation in the tunneling process of the overlapping shield tunnel, grouting reinforcement is carried out on the house foundation on a pedestrian walkway between the house and the municipal main road to form a house foundation grouting area 4; in order to avoid the house foundation from bulging and cracking due to too high grouting pressure, the grouting reinforcement of the foundation adopts a sleeve valve pipe grouting process; because the shield cutter head can not cut the steel bar type barrier in the tunneling process, the influence of the inclination of the grouting hole on the shield tunneling is avoided, and the sleeve valve pipe is made of PVC material.

By adopting the sleeve valve pipe grouting process, the house foundation grouting area 4 can be positioned outside the shield tunneling range according to the characteristics of the sectional grouting, so that the nonuniformity of the soil layer strength of the shield tunneling area is avoided, a bias state is generated, and the difficulty of shield attitude control is increased.

In the advanced tunnel deep hole grouting area 6, the longitudinal section is in a sector ring shape with a central angle of 180 degrees.

And (3) performing synchronous grouting in the tunneling process of the advance shield tunnel 5 of the overlapping tunnel, and performing secondary grouting after tunneling is completed so as to reduce disturbance to an overlying soil layer.

And a back tunnel deep hole grouting area 8 with a circular longitudinal section.

And (3) carrying out synchronous grouting in the tunneling process of the backward shield tunnel 7 of the overlapping tunnel, and carrying out secondary grouting after tunneling is finished so as to reduce disturbance to the forward tunnel and the overlying soil layer.

With the rapid development of the infrastructure industry, the construction of urban rail transit represented by subways is in the spotlight; at present, in China, there are not many cases about small-radius curve overlapping shield tunnel construction of houses close to old communities and the like; in order to prevent accidents, soil layers in the influence range of the shield tunnel need to be reinforced before and during the construction of the overlapping shield tunnel, so that the damage and the uneven settlement of soil layer structures around the tunnel are controlled.

The utility model relates to a fold and intersect shield tunnel house foundation reinforced structure for next-door neighbour's house solves and constructs the tunnel tunnelling construction because of the curve fold of little radius, leads to the ground in the house in the influence zone to produce secondary disturbance and destruction, and it is inhomogeneous settlement and deformation to produce the soil body to cause house slope, fracture, collapse, bring huge economic loss and life incident's problem.

The utility model relates to a fold and intersect shield tunnel house ground reinforced structure for next-door neighbour's house, what adopt is house ground sleeve valve pipe slip casting + fold and intersect shield tunnel peripheral soil layer slip casting reinforced combined type processing method, can solve the soil body structural damage that produces because of the curve fold of little radius is constructed tunnel construction betterly, cause old district house fracture, the problem that inclines and collapses, can be used to the shield tunnel construction under the complex condition, have apparent time limit for a project and economic benefits.

The utility model relates to a fold and intersect shield tunnel house foundation reinforced structure for next-door neighbour's house, the step is as follows:

step one, pipeline digging and field leveling are performed.

According to the design, pipeline exploration excavation is carried out in sleeve valve pipe grouting areas on site, municipal pipeline 1 is exposed and protected, the site is leveled, and point location lofting is carried out according to the designed distance.

And step two, laying house monitoring points.

And (5) according to the monitoring requirements of the house 2, arranging monitoring points and obtaining initial values.

And thirdly, grouting construction is carried out on the sleeve valve pipe.

Measuring and lofting: and according to the coordinates, carrying out grouting hole paying-off by adopting a total station, measuring the ground elevation by utilizing a level gauge, and calculating the depth of the lead hole.

Hole guiding: the drilling depth of the drilling hole is up to the grouting consolidation section by adopting a 100-type engineering geological drilling machine and a casing protection wall mode for hole leading operation.

Tube laying: connecting sleeve valve pipes according to the depth of the guide holes, wherein the upper openings of the sleeve valve pipes are about 20cm higher than the ground, and sealing the lower openings of the connected sleeve valve pipes by using sharp bottoms; then the sleeve valve tube is put into the hole, and the sleeve valve tube is ensured to be put to the bottom of the hole.

Hole washing: and (3) cleaning the inside of the hole by using high-pressure water, so that sediments in the hole are reduced, and the specific gravity of the slurry is reduced.

And (3) sealing: and quick-setting cement mortar is adopted for plugging within the depth range from the ground around the orifice to 1m below the ground, so that the slurry bleeding phenomenon in the grouting process is prevented.

Grouting: the grouting material is 32.5-grade ordinary portland cement with a water-cement ratio of 0.5: 1; the grouting pump is of ZBSB-70-11 type, and is provided with a high-pressure grouting pipeline system and a pulping device; a sectional grouting mode is adopted, the length of each section of grouting is a grouting step pitch, the length of the grouting step pitch is set to be 0.6m, and the length of the opening steel pipe is the length of the grouting step pitch; in the grouting process, after each section of grouting is finished, the core pipe moves upwards or downwards by the length of the core pipe with one step.

Fourthly, cleaning the site and recovering the access way.

And (5) cleaning the site, backfilling pipelines and recovering the access 3.

Fifthly, grouting quality inspection.

And after 28 days of grouting, drilling and sampling the grouting area 4 by using a drilling machine, testing the compressive strength and the permeability coefficient, and performing shield tunneling after the requirements are met.

And sixthly, constructing the shield tunnel in advance.

Starting the tunneling construction of the advance shield tunnel 5 according to the principle of first-down and last-up; in the shield tunneling process, synchronous grouting and secondary grouting are carried out; and in the process of the reinforced shield tunneling, monitoring the deformation and the inclination of the ground structure, and performing deep hole grouting 6 in time after the tunneling is finished.

And seventhly, arranging monitoring points of the shield tunnel in advance.

And according to the monitoring requirements, monitoring points are distributed on the constructed advanced shield tunnel, and initial values are obtained.

And eighthly, constructing the backward shield tunnel.

And after one month of the construction of the advance shield tunnel, performing construction of a backward shield tunnel 7, simultaneously enhancing monitoring work on the earth surface house and the advance shield tunnel, performing synchronous grouting and secondary grouting in the tunneling process of the shield tunnel, and performing deep hole grouting 8 after tunneling.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.

Claims (7)

1. The utility model provides a fold and intersect shield tunnel house foundation reinforced structure for next-door neighbour's house which characterized in that: the house foundation grouting device comprises a house (2), a municipal main road (9), a pedestrian access road (3) positioned between the house (2) and the municipal main road (9), a municipal pipeline (1) buried under the pedestrian access road (3), a house foundation grouting area (4) positioned under the pedestrian access road (3) and close to the house (2), a preceding shield tunnel (5) positioned under the house foundation grouting area (4), a preceding tunnel deep hole grouting area (6) positioned above the preceding shield tunnel (5), a backward shield tunnel (7) positioned above the preceding tunnel deep hole grouting area (6), and a backward tunnel deep hole grouting area (8) positioned around the backward shield tunnel (7); the leading shield tunnel (5) and the trailing shield tunnel (7) are mutually overlapped tunnels;

the house foundation grouting area (4) comprises a rectangular grouting area positioned outside the house (2) and a fan-shaped grouting area positioned right below the house (2);

and grouting the house foundation grouting area (4) by adopting a sleeve valve pipe.

2. The overlapping shield tunnel house foundation stabilization structure for immediate vicinity houses of claim 1, wherein: the sleeve valve pipe is made of PVC material.

3. The overlapping shield tunnel house foundation stabilization structure for immediate vicinity houses of claim 1, wherein: grouting of the sleeve valve pipe is segmented grouting, and a grouting area (4) of the house foundation is positioned outside a shield tunneling range.

4. The overlapping shield tunnel house foundation stabilization structure for immediate vicinity houses of claim 1, wherein: the tunneling process of the advance shield tunnel (5) is synchronous with the primary grouting, and the secondary grouting is carried out after the tunneling is finished.

5. The overlapping shield tunnel house foundation stabilization structure for immediate vicinity houses of claim 1, wherein: the longitudinal section of the advanced tunnel deep hole grouting area (6) is in a sector ring shape with a central angle of 180 degrees.

6. The overlapping shield tunnel house foundation stabilization structure for immediate vicinity houses of claim 1, wherein: the tunneling process of the backward shield tunnel (7) is synchronous with the primary grouting, and secondary grouting is carried out after tunneling is finished.

7. The overlapped shield tunnel house foundation stabilization structure for immediate vicinity houses according to any one of claims 1 to 6, wherein: and a back tunnel deep hole grouting area (8) with a circular longitudinal section.

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