CN106640107A - Tool of jacking pipe entering tunnel in foamed soil without need of foundation reinforcement outside pit and construction method thereof - Google Patents

Tool of jacking pipe entering tunnel in foamed soil without need of foundation reinforcement outside pit and construction method thereof Download PDF

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Publication number
CN106640107A
CN106640107A CN201611167395.XA CN201611167395A CN106640107A CN 106640107 A CN106640107 A CN 106640107A CN 201611167395 A CN201611167395 A CN 201611167395A CN 106640107 A CN106640107 A CN 106640107A
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CN
China
Prior art keywords
hole
push pipe
push
soil
nuzzling
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Granted
Application number
CN201611167395.XA
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Chinese (zh)
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CN106640107B (en
Inventor
张中杰
吕培林
张栋梁
俞震中
丁嘉毅
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Shanghai Urban Construction Design Research Institute Co ltd
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Shanghai Urban Construction Design Research Institute Co ltd
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Priority to CN201611167395.XA priority Critical patent/CN106640107B/en
Publication of CN106640107A publication Critical patent/CN106640107A/en
Application granted granted Critical
Publication of CN106640107B publication Critical patent/CN106640107B/en
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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/10Making by using boring or cutting machines
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04Lining with building materials
    • E21D11/10Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/14Lining predominantly with metal
    • E21D11/15Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/38Waterproofing; Heat insulating; Soundproofing; Electric insulating
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/14Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings

Abstract

The invention discloses a tool of jacking pipe entering tunnel in foamed soil without the need of foundation reinforcement outside a pit and a construction method thereof. A foamed soil cabin-filling tunnel-entering area is arranged in a jacking pipe work well in combination with a building enclosure provided with an machinable body in advance, a double-hoop water stopping unit and a tunnel hole liquid nitrogen ring are internally arranged, and thus a guarantee is achieved; and a jacking pipe safely enters the tunnel through a series of auxiliary measures, for example, steel plates are connected piece by piece to achieve well joint closing. Pipeline moving and road occupying which are needed for a conventional jacking pipe tunnel-entering reinforcement mode are completely avoided, meanwhile, destruction of soil ecological conditions of corresponding regions is avoided, environmental protection is achieved, and the tool and the construction method are particularly suitable for the urban center city area of which underground pipelines are intensive and ground traffic is busy and green areas which have strict ecological protection requirements.

Description

Enter hole frock and its construction method without the need for push pipe in the foam soil of the outer foundation stabilization in hole
Technical field
The present invention relates to underpass engineering construction technical field, more particularly to a kind of foam without the need for the outer foundation stabilization in hole Push pipe enters hole frock and its construction method in soil.
Background technology
In recent years, with the fast development that city development is built, in economically developed, heavy traffic large and medium-sized city, it is Improve the trip requirements of zonal communication function and hommization, such as pedestrian crossing passage, subway transferring passage, get off During all types of underpass engineering constructions such as storehouse communication channel, business underground vestibule are just carried out in high gear.Due to such Underpass plans to build place and is typically in inner city, builds according to cut and cover method, generally requires to take road for a long time, pipeline and Greening resettlement amount is big, and building removal amount is more, and construction period will have a negative impact to surrounding environment, traffic etc., cause build with Environment, traffic, the contradiction of society, therefore main flow enforcement means are increasingly becoming using construction by pipeline jacking method.
According to the technological requirement of construction by pipeline jacking method, although push pipe section itself need not excavate ground, but remain a need in push pipe section Two ends are provided with the upper pipe working well of foundation ditch open cut, structure cast-in-place, and to meet push pipe export & import safety, must under normal condition The composite frozen method combined using freezing method or cement system method for strengthening or both carries out export & import reinforcing.Wherein, freezing method is not only It is of a high price, and under unfreezing, the soil body can occur compared with the heavy change of Talon, easily cause potential safety hazard to adjacent lines;Cement The cement such as native mixing pile, high-pressure rotary jet grouting pile system reinforces the construction that generally faces down, and construction period needs to occupy surface road, and Stabilization zone gut line is moved;Simultaneously both of which is destroyed completely to the ecological condition of original-state soil, all cannot be applied to apply Duration must also maintain the greening protection zone (such as ancient and well-known trees region) of plant life condition, therefore, using it is upper all exist it is larger Limitation.
Those skilled in the art are devoted to developing in a kind of underpass that can be applicable to and implemented by push bench process, without the need for volume Outer occupancy ground, do not affect underground utilities, do not change soil layer ecological environment, while and safe and reliable entering hole strengthening construction side Method.
The content of the invention
In view of the drawbacks described above of prior art, the present invention provides push pipe in a kind of foam soil without the need for the outer foundation stabilization in hole It is to completely avoid the pipeline that conventional push pipe enters needed for the reinforcing mode of hole to enter one of hole frock and its construction method, purpose of realization Resettlement and road take, while avoiding the destruction of respective regions Soil Ecological Condition, environmental protection is especially suitable for underground utilities The busy down town city of intensive, traffic above-ground and the green belt required with strict ecological protection.
For achieving the above object, the invention provides entering hole frock without the need for push pipe in the foam soil of the outer foundation stabilization in hole, wrap Building enclosure, push pipe are included, work well is provided with the building enclosure, the work well includes push pipe work well side wall, push pipe work shaft bottom plate.
Wherein, top offers push pipe hole for hoist in the work well, by the push pipe work well below the push pipe hole for hoist The region that side wall, the push pipe work shaft bottom plate are surrounded is filled in barn region for foam soil, and the foam soil is filled in barn the foam-filled soil in region, The work well side wall is provided with push pipe and enters hole, and the corresponding push pipe of the building enclosure enters hole position and is provided with machinable body.
The push pipe is connected with push-bench, and the push pipe nationality breaks the machinable body by the push-bench, from the top Pipe enters hole into the work well.
The push-bench includes push-bench casing, push-bench head is provided with the push-bench casing, before the push-bench The one end entered is provided with cutterhead, and the other end connects the push pipe.
The lateral wall of one end end that the push pipe is connected with the push-bench is provided with pre-embedded steel slab.
Preferably, the push pipe enters hole and is provided with pre- hole steel loop of nuzzling, and in the pre- hole steel loop of nuzzling liquid nitrogen endless tube road is provided with, In a ring, round along the pre- inner surface for nuzzling hole steel loop on the liquid nitrogen endless tube road.
Enter the construction method of hole frock without the need for push pipe in the foam soil of the outer foundation stabilization in hole, step is as follows:
A. the building enclosure of the work well is built according to cutting depth, geological conditions, surrounding enviroment, is gone along with sb. to guard him described The structure correspondence push pipe enters the position in hole and arranges the machinable body;
B. routinely way completes the excavation of foundation pit and agent structure of the work well and returns and build, and the push pipe enters hole and arranges described Nuzzle in advance hole steel loop, the push pipe that the pre- hole steel loop internal diameter sky size of nuzzling is headed into than the later stage from the Gong Jing sides it is outer Wall is big;
C., liquid nitrogen endless tube road is set, near the position of the building enclosure in the pre- hole steel loop of nuzzling, around described pre- Hole steel loop inwall of nuzzling arranges liquid nitrogen endless tube road;
D. fill in barn described in area filling foam soil to the foam soil;
E. operate the push-bench inwardly to tunnel from work well outside, cut through the described of the building enclosure and cut Body is cut, push pipe described in Jing enters hole, filled in barn region into the foam soil, and continue to be cut into the work well;
F. it is pre- with described in the push pipe after reaching precalculated position when the push-bench head fully enters the work well In the gap nuzzled between hole steel loop and/or the push pipe and the building enclosure, polyurathamc is filled in, form bicyclic hoop and stop Water;
G. steel plate closing well joint is welded to connect piecewise, and in the work well, the push pipe enters hole side, with the manually side of abolishing Formula substep abolishes hardened foam soil, and nationality is by the junction steel plate by pre- hole steel loop and the pre-buried steel of nuzzling Plate weld is closed;
H. remove and fill in barn in area remaining foam soil and reclaim the push-bench;
I. the ring beam of reinforced concrete cast-in-situ one is adopted with the pre- hole steel loop interface of nuzzling in the push pipe, described Nuzzle in advance hole steel loop, the junction steel plate and the pre-embedded steel slab forms injection fill concrete in annulus, is formed forever Well joint, the leakage passage of thorough closure seam.
Preferably, the building enclosure uses diaphram wall, cast-in-situ bored pile or hole-drilling interlocking pile and makes, right Answer the push pipe to enter the relevant position in hole, conventional regular reinforcement is replaced using glass fiber-reinforced polymer.
Preferably, the building enclosure adopts shaped steel Soil-cement Wall, before push pipe start tunneling, needs to extract H types Steel.
Preferably, the pre- hole steel loop internal diameter sky size of nuzzling is bigger than the push pipe outer wall that the later stage heads into from outside well 250mm。
Preferably, in step d, before the foam soil is filled, fill in barn in region in the foam soil, away from The push pipe enters the position in hole and arranges a steel seal case, for reducing the volume that the foam soil is filled in barn in region.
Preferably, the foam soil dry density is 600~800kg/m3, 5~10MPa of compression strength.
Preferably, in step f, when the misalignment of axe of the push pipe is excessive or place stratum for artesian aquifer when and When there is the difficult risk of sealing, open the liquid nitrogen endless tube road and pre- nuzzle between hole steel loop and the building enclosure to described The rapid freezing partly in gap.
Preferably, in step g, hardened foam soil is abolished manually to abolish mode substep, is formed not little In the wide grooves of 1m, in the groove, along it is described it is pre- nuzzle hole steel loop from the top down, the alternate mode in left and right is with some Junction steel plate described in block is by pre- hole steel loop and the pre-embedded steel slab welded closure of nuzzling.
Beneficial effects of the present invention:
The present invention arranges foam soil in push pipe work well and fills in barn Jin Dong areas, combine the building enclosure of reserving machinable body and Inside set bicyclic hoop sealing, hole liquid nitrogen ring to be ensured;Using a series of ancillary methods such as the closing well joints of junction steel plate piecewise, The safety of achievable push pipe enters hole.
Present invention completely avoids the relocation of services that enters needed for the reinforcing mode of hole of conventional push pipe and road take, while avoiding The destruction of respective regions Soil Ecological Conditions, environmental protection is especially suitable for the city that underground utilities are intensive, traffic above-ground is busy Inner city and the green belt required with strict ecological protection.
The technique effect of the design, concrete structure and generation of the present invention is described further below with reference to accompanying drawing, with It is fully understood from the purpose of the present invention, feature and effect.
Description of the drawings
Fig. 1 is illustrated that the structural representation of work well part in one embodiment of the invention.
Fig. 2 is illustrated that view of the push-bench into work well in one embodiment of the invention.
Fig. 3 is illustrated that the structural representation in push pipe arrival precalculated position in one embodiment of the invention.
Fig. 4 is illustrated that in Fig. 3 of the present invention close-up schematic view at A.
Fig. 5 is illustrated that in Fig. 3 of the present invention close-up schematic view at B.
Fig. 6 is illustrated that in one embodiment of the invention and arranges groove and be welded to connect the schematic diagram of steel plate.
When Fig. 7 is illustrated that push pipe cross section is rectangle in one embodiment of the invention, its end arranges the knot of junction steel plate Structure schematic diagram.
When Fig. 8 is illustrated that push pipe cross section is circular in one embodiment of the invention, its end arranges the knot of junction steel plate Structure schematic diagram.
Fig. 9 is illustrated that the structural representation of push pipe installation in one embodiment of the invention.
Figure 10 is illustrated that in Fig. 9 of the present invention close-up schematic view at C.
Specific embodiment
Embodiment
As shown in figure 1, enter hole frock, including building enclosure 1, push pipe 4 without the need for push pipe in the foam soil of the outer foundation stabilization in hole, Work well 2 is provided with building enclosure 1, work well 2 includes push pipe work well side wall 21, push pipe work shaft bottom plate 22.
Wherein, top offers push pipe hole for hoist 23 in work well 2, push pipe hole for hoist 23 below by push pipe work well side wall 21, The region that push pipe work shaft bottom plate 22 is surrounded is filled in barn region 3 for foam soil, and foam soil is filled in barn region 3 foam-filled native 9, work well side wall 21 are provided with push pipe enters hole 24, and the correspondence push pipe of building enclosure 1 enters the position of hole 24 and is provided with machinable body 11.
As shown in Fig. 2 push pipe 4 is connected with push-bench 5, the nationality of push pipe 4 breaks machinable body 11 by push-bench 5, enters from push pipe Hole 24 is entered in work well 2.
Push-bench 5 includes being provided with push-bench head 52 in push-bench casing 51, push-bench casing 51, what push-bench 5 advanced One end is provided with cutterhead 53, other end connecting jacking pipe 4.
The lateral wall of one end end that push pipe 4 is connected with push-bench 5 is provided with pre-embedded steel slab 41.
As shown in Figures 3 to 5, in certain embodiments, push pipe enters hole 24 and is provided with pre- hole steel loop 25 of nuzzling, hole steel of nuzzling in advance Liquid nitrogen endless tube road 26 is provided with ring 25, in a ring, the inner surface along hole steel loop 25 of nuzzling in advance rounds on liquid nitrogen endless tube road 26.
Enter the construction method of hole frock without the need for push pipe in the foam soil of the outer foundation stabilization in hole, step is as follows:
A. as shown in figure 1, building the building enclosure 1 of work well 2 according to cutting depth, geological conditions, surrounding enviroment, going along with sb. to guard him The correspondence push pipe of structure 1 enters the position in hole 24 and arranges machinable body 11;
The building enclosure 1 of the foundation ditch of work well 2 is typically based on the factors such as cutting depth, geological conditions, surrounding enviroment, selectively under Diaphragm wall, cast-in-situ bored pile, hole-drilling interlocking pile or shaped steel Soil-cement Wall TRD or SMW engineering method stake.But using this construction method When, work well 2 enters the gusset protection structure 1 of hole 24 in push pipe must reserve the good condition that push-bench can be made directly to pass through, so as to avoid with The mode that artificial chisel is removed abolishes portal.
B. as shown in Fig. 2 routinely way complete work well 2 excavation of foundation pit and agent structure return build, push pipe enters hole 24 and sets Pre- hole steel loop 25 of nuzzling is put, the outer wall of the push pipe 4 that the internal diameter of hole steel loop 25 sky size of nuzzling in advance is headed into than the later stage from the side of work well 2 Greatly;
C. as shown in Figures 3 to 5, liquid nitrogen endless tube road 26 is set, near the position of building enclosure 1 in hole steel loop 25 of nuzzling in advance Put, around nuzzling in advance, the inwall of hole steel loop 25 arranges liquid nitrogen endless tube road 26;
D. as shown in Fig. 2 filling in barn the filled and process soil 9 of region 3 to foam soil;
Receive in work well 2 in the space that push pipe 4 will be reached, filled with foam soil 9, treat that foam soil hardening forms intensity Afterwards, become in whole space without cavity entity, as shown in Figure 2.
Wherein, foam soil is also referred to as foamed cement light soil, is can to carry out cast in situs or mould molding, Jing natural curings A kind of New Building Materials containing a large amount of sealed porositys for being formed, are just widely used in all kinds of engineering fields.
E. operate push-bench 5 inwardly to tunnel from the outside of work well 2, cut through the machinable body of building enclosure 1
11, Jing push pipes enter hole 24, fill in barn region 3 into foam soil, and continue to be cut into work well 2;
Push-bench 5 is inwardly tunneled from the outside of work well 2, cuts through building enclosure 1, into the foam soil in pre-buried steel loop 25 Fill in barn region 3, and continue to be cut into work well 2, now push-bench casing 51 by still 9 entities of unhewn foam soil institute closely Parcel, the working condition of push-bench 5 is similar with the soil layer of hard plastic state.
F. when push-bench head 52 fully enters work well 2, after reaching precalculated position, in push pipe 4 and hole steel loop 25 of nuzzling in advance And/or in the gap between push pipe 4 and building enclosure 1, polyurathamc is filled in, form bicyclic hoop sealing 42;
Complete 52 of push pipe head enters work well 2, and completely out end is located at when nuzzling hole 25 inner side of steel loop in advance, by reserved Injected hole in nuzzle in advance hole steel loop 25 and the width range of building enclosure 1, fills in polyurathamc respectively, forms bicyclic hoop sealing 42。
G. as shown in Figure 6 to 8, the closing well joint of steel plate 7 is welded to connect piecewise, and in work well 2, push pipe enters the side of hole 24, Hardened foam soil 9 is abolished manually to abolish mode substep, nationality is by junction steel plate 7 by hole steel loop 25 and the pre-buried steel of nuzzling in advance The welded closure of plate 41;
In work well 2, the foam soil 9 for making cleaning needed for well joint is abolished manually to abolish mode substep, formed not little In the wide grooves of 1m.
During the groove construction, a construction section is often completed, just immediately will be pre- to the junction steel plate 41 using 10mm thickness Nuzzle welded closure between hole steel loop 25 and tube coupling end outsourcing pre-embedded steel slab 41.
H. remove and fill in barn in area remaining foam soil 9 and reclaim push-bench 5;
9 weight are little due to the foam soil that adopted, low intensity and quality is loose, and crushing and clearing construction is more convenient.Treat steel Reinforced concrete well joint is reached after design strength, and remaining foam soil 9 gives hand breaking removing in region 3 of filling in barn to foam soil, Again to expose and give recycle without damage after push-bench head 52.
After foam soil 9 is fully erased, the referable of work well 2 is using having no effect on later stage building function.
I. as shown in Figure 9 and Figure 10, the circle of reinforced concrete cast-in-situ one is adopted with the interface of hole steel loop 25 of nuzzling in advance in push pipe 4 Ring beam 8, forms in hole steel loop 25 of nuzzling in advance, junction steel plate 7 and pre-embedded steel slab 41 and inject in annulus fill concrete 81, shape Into permanent well joint, the leakage passage of thorough closure seam.
Form permanent well and connect using the ring beam 8 of reinforced concrete cast-in-situ one with the interface of hole steel loop 25 of nuzzling in advance in push pipe 4 Head, the leakage passage of thorough closure seam, while meeting structure durability requirement, now construction is fully completed,
Wherein, ring beam is the works that 8 protrusion active wells enter hole side wall, width 400mm, highly to enter hole steel loop inwall 250mm is put outward to push pipe inwall scope.
In certain embodiments, building enclosure 1 uses diaphram wall, cast-in-situ bored pile or hole-drilling interlocking pile system Into, enter the relevant position in hole 24 in correspondence push pipe, conventional regular reinforcement is replaced using glass fiber-reinforced polymer.
In certain embodiments, building enclosure 1 adopts shaped steel Soil-cement Wall, before push pipe enters the construction of hole 24, needs Extract H profile steel.
In certain embodiments, the internal diameter of hole steel loop 25 sky size of nuzzling in advance is bigger than the outer wall of push pipe 4 that the later stage heads into from outside well 250mm。
In certain embodiments, in step d, before filled and process soil 9, fill in barn in region 3, away from top in foam soil Pipe enters the position in hole 24 and arranges a steel seal case, for reducing the volume that foam soil is filled in barn in region 3.
It is the reduction amount of filling when space content product is excessive, also can first customizes a steel seal case and be positioned over reception In layer, then only need to fill space in the steel seal box.
In certain embodiments, 9 dry densities of foam soil are 600~800kg/m3, 5~10MPa of compression strength.
In certain embodiments, in step f, when the misalignment of axe of push pipe 4 is excessive or place stratum is artesian aquifer And when there is the risk of sealing difficulty, open 26 pairs, road of the liquid nitrogen endless tube gap nuzzled in advance between hole steel loop 25 and building enclosure 1 Rapid freezing partly.
In certain embodiments, in step g, hardened foam soil 9 is abolished manually to abolish mode substep, is formed The groove 10 wide not less than 1m, in groove 10, along nuzzle in advance hole steel loop 25 from the top down, the alternate mode in left and right is with some pieces Junction steel plate 7 will be nuzzled in advance hole steel loop 25 and the welded closure of pre-embedded steel slab 41.
As shown in FIG. 7 and 8, the size of junction steel plate 7 should be with reference to overall section configuration, construction risk, the structure of push pipe passage The combined factors determinations such as part processing convenience, typically can control every piece of projected length about 1m.Within dead size 6*3.3m rectangle As a example by push pipe, 22 pieces can be divided into altogether, wherein, upper and lower side is each 6 pieces, and left and right side is each 5 pieces, refers to accompanying drawing 7;With the circle of internal diameter 5.6m As a example by shape push pipe, 18 pieces can be divided into altogether, be centrosymmetrically arranged, refer to accompanying drawing 8.
The preferred embodiment of the present invention described in detail above.It should be appreciated that one of ordinary skill in the art without Need creative work just can make many modifications and variations with design of the invention.Therefore, all technologies in the art Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea Technical scheme, all should be in the protection domain being defined in the patent claims.

Claims (10)

1. hole frock, including building enclosure (1), push pipe (4) are entered without the need for push pipe in the foam soil of the outer foundation stabilization in hole, it is described to go along with sb. to guard him Work well (2) is provided with structure (1), the work well (2) includes push pipe work well side wall (21), push pipe work shaft bottom plate (22), its feature It is:Top offers push pipe hole for hoist (23) in the work well (2), and the push pipe hole for hoist (23) is below by the push pipe work The region that well side wall (21), the push pipe work shaft bottom plate (22) surround is filled in barn region (3) for foam soil, and the foam soil is filled in barn area The foam-filled soil (9) in domain (3), the work well side wall (21) is provided with push pipe and enters hole (24), the corresponding top of the building enclosure (1) Pipe enters hole (24) position and is provided with machinable body (11);The push pipe (4) is connected with push-bench (5), and push pipe (4) nationality is by described Push-bench (5) breaks the machinable body (11), enters hole (24) from the push pipe interior into the work well (2);The push-bench (5) including push-bench casing (51), push-bench head (52) is provided with the push-bench casing (51), before the push-bench (5) The one end entered is provided with cutterhead (53), and the other end connects the push pipe (4);The push pipe (4) be connected with the push-bench (5) one The lateral wall of end end is provided with pre-embedded steel slab (41).
2. push pipe enters hole frock in the foam soil without the need for the outer foundation stabilization in hole according to claim 1, it is characterised in that institute State push pipe and enter hole (24) and be provided with pre- hole steel loop (25) of nuzzling, in the pre- hole steel loop (25) of nuzzling liquid nitrogen endless tube road (26) is provided with, The liquid nitrogen endless tube road (26) in a ring, is rounded along the pre- inner surface for nuzzling hole steel loop (25).
3. push pipe enters the construction method of hole frock, step in the foam soil without the need for the outer foundation stabilization in hole according to claim 2 It is rapid as follows:
A. the building enclosure (1) of the work well (2) is built according to cutting depth, geological conditions, surrounding enviroment, is enclosed described Protection structure (1) the correspondence push pipe enters the position in hole (24) and arranges the machinable body (11);
B. routinely way complete the work well (2) excavation of foundation pit and agent structure return build, the push pipe enter hole (24) setting The pre- hole steel loop (25) of nuzzling, pre- hole steel loop (25) the internal diameter sky size of nuzzling is pushed up than the later stage from work well (2) side The outer wall of the push pipe (4) for entering is big;
C., liquid nitrogen endless tube road (26) is set, near the position of the building enclosure (1) in the pre- hole steel loop (25) of nuzzling, around Pre- hole steel loop (25) inwall of nuzzling arranges liquid nitrogen endless tube road (26);
D. foam soil (9) is filled to foam soil region (3) of filling in barn;
E. operate the push-bench (5) inwardly to tunnel from the work well (2) outside, cut through the institute of the building enclosure (1) Machinable body (11) is stated, push pipe described in Jing enters hole (24), filled in barn region (3) into the foam soil, and continue to be cut into institute State in work well (2);
F. when the push-bench head (52) fully enters the work well (2), after reaching precalculated position, the push pipe (4) with In the pre- gap nuzzled between hole steel loop (25) and/or the push pipe (4) and the building enclosure (1), foaming is filled in poly- Urethane, forms bicyclic hoop sealing (42);
G. steel plate (7) closing well joint is welded to connect piecewise, and in the work well (2), the push pipe enters hole (24) side, with artificial Abolish mode substep and abolish hardened foam soil (9), nationality is by the junction steel plate (7) by the pre- hole steel loop of nuzzling (25) with the pre-embedded steel slab (41) welded closure;
H. remove and fill in barn in area remaining foam soil (9) and reclaim the push-bench (5);
I. the ring beam (8) of reinforced concrete cast-in-situ one is adopted with pre- hole steel loop (25) interface of nuzzling in the push pipe (4), Formed to be injected in annulus in the pre- hole steel loop (25) of nuzzling, the junction steel plate (7) and the pre-embedded steel slab (41) and filled out Concrete (81) is filled, permanent well joint, the leakage passage of thorough closure seam is formed.
4. push pipe enters the construction method of hole frock in the foam soil without the need for the outer foundation stabilization in hole according to claim 3, its It is characterised by, the building enclosure (1) uses diaphram wall, cast-in-situ bored pile or hole-drilling interlocking pile and makes, in correspondence The push pipe enters the relevant position of hole (24), and using glass fiber-reinforced polymer conventional regular reinforcement is replaced.
5. push pipe enters the construction method of hole frock in the foam soil without the need for the outer foundation stabilization in hole according to claim 3, its It is characterised by, the building enclosure (1) before push pipe enters hole (24) construction, needs to extract H types using shaped steel Soil-cement Wall Steel.
6. push pipe enters the construction method of hole frock in the foam soil without the need for the outer foundation stabilization in hole according to claim 3, its It is characterised by, pre- hole steel loop (25) the internal diameter sky size of nuzzling is bigger than the push pipe (4) outer wall that the later stage heads into from outside well 250mm。
7. push pipe enters the construction method of hole frock in the foam soil without the need for the outer foundation stabilization in hole according to claim 3, its It is characterised by, in step d, before foam soil (9) is filled, fills in barn in region (3) in the foam soil, away from The push pipe enters the position in hole (24) and arranges a steel seal case, fills in barn in region (3) for reducing the foam soil Volume.
8. push pipe enters the construction method of hole frock in the foam soil without the need for the outer foundation stabilization in hole according to claim 3, its It is characterised by, described foam soil (9) dry density is 600~800kg/m3, 5~10MPa of compression strength.
9. push pipe enters the construction method of hole frock in the foam soil without the need for the outer foundation stabilization in hole according to claim 3, its Be characterised by, in step f, when the misalignment of axe of the push pipe (4) is excessive or place stratum for artesian aquifer when and deposit In the difficult risk of sealing, the liquid nitrogen endless tube road (26) is opened to pre- hole steel loop (25) and the building enclosure of nuzzling (1) the rapid freezing partly in gap between.
10. push pipe enters the construction method of hole frock in the foam soil without the need for the outer foundation stabilization in hole according to claim 3, its It is characterised by, in step g, manually to abolish mode substep hardened foam soil (9) is abolished, is formed and be not less than 1m Wide groove (10), in the groove (10), along it is described it is pre- nuzzle hole steel loop (25) from the top down, the alternate side in left and right Formula is with some pieces of junction steel plates (7) by pre- hole steel loop (25) and the pre-embedded steel slab (41) welded closure of nuzzling.
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