CN109555535A - The purlin Xia Lu form prestressed pipe curtain structure and construction method - Google Patents
The purlin Xia Lu form prestressed pipe curtain structure and construction method Download PDFInfo
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- CN109555535A CN109555535A CN201710892360.0A CN201710892360A CN109555535A CN 109555535 A CN109555535 A CN 109555535A CN 201710892360 A CN201710892360 A CN 201710892360A CN 109555535 A CN109555535 A CN 109555535A
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- precast concrete
- pipe curtain
- concrete beam
- prestressed
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
- E21D11/083—Methods or devices for joining adjacent concrete segments
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining 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
- E21D11/107—Reinforcing elements therefor; Holders for the reinforcing elements
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
Abstract
A kind of purlin Xia Lu form prestressed pipe curtain structure and construction method, the structure are made of several precast concrete beams, two pre-manufactured steel units, two abutments, transversely prestressed bars and longitudinal prestressing muscle；Several beams of concretes are connected by lock and crack grouting, and form entirety by the tensioning transversely prestressed bars and longitudinal prestressing muscle；Described two pre-manufactured steel units are placed in two upper left, upper right angle points, and the operation platform as transversely prestressed bars, apply transverse prestress for several precast concrete beams.When construction, precast concrete beam displacement promotes, using the steel unit at two angles as the job location of transversely prestressed bars, pass through prestressing force in length and breadth simultaneously, several independent components of pipe curtain surrounding are tightly bound round together, and are supported on the abutment at tunnel both ends, to control the deformation of pipe curtain, the globality of pipe curtain is improved, and then reaches higher safety and economy.
Description
Technical field
The invention belongs to technical field of civil engineering, more particularly relate to a kind of purlin Xia Lu form prestressed pipe curtain construction skill
Art.
Background technique
Pipe curtain construction technology is a kind of trenchless technology for constructing underground structure, is chiefly used in passing through road, railway, structure
The hypogee on object, airport etc..Pipe curtain construction technology is used by excavating Starting Well and active well at the both ends of underground structure
The mode of jacking prefabricated components forms annular curtain structure in underground, has the function that bear surrounding load and sealing, and then dig
It digs and constructs underground structure.As one kind of no-dig technique technique, pipe curtain construction technology relative to construction technologies such as push pipe, shields and
Speech, the influence of requirement and surrounding enviroment to construction space is all smaller, has successful case in countries in the world.
By the engineering practice in more than 40 years, a variety of different pipe curtain construction technologies, including ESA (Endless are developed
Self-advancing) engineering method, FJ (Front Jacking Method) engineering method, RBJ (Roof-Box Jacking Method)
Engineering method, R&C (Roof&Culvert) engineering method, new pipe-roof method (New Tubular Roof Method, abbreviation NTR engineering method) etc..Its
In for ESA engineering method, FJ engineering method, RBJ engineering method and R&C engineering method, the pipe curtain of jacking is only used as temporary structure, be the later period box culvert
Jacking provides certain supporting and waterproof action, and difference is that the mode of jacking box culvert is different.New pipe-roof method, as tradition
The improvement of pipe-roof method, using large diameter steel pipe, (diameter retains generally in 1800mm or more) jacking as permanent structure
Get off, the construction later period constructs in the watertight volume that its push pipe is formed does works outer profile.But above-mentioned various pipe curtains
Construction technology, process is tedious, needs to carry out pipe curtain and box culvert two parts jacking, extends construction period, increases cost；Additionally, due to
The presence of upper tube curtain, box culvert absolute altitude must accordingly decrease, and increase active well foundation depth, increase difficulty of construction and wind
Danger.
Chinese patent CN105464675A discloses a kind of novel face contact pipe curtain structure and its construction method, pipe curtain structure
As tunnel advanced support structure, it is spliced by the rectangular steel pipe or similar rectangular steel pipe that include at least two contact planes,
It is face contact between steel pipe and adjacent steel pipe；Steel pipe include at least two contact planes, respectively with the contact plane of adjacent steel pipe
Seamless fitting；The size of two contact planes contacted with each other is adapted to each other；It is connect in the outside wall surface of the steel pipe, along one
Two long edges of touching plane are respectively welded a slideway, and adjacent two steel pipes are fixedly connected by slideway.Wherein, pipe curtain
Structure cannot function as permanent structure, only by welding slideway joint steel pipe, compared with the structure that prestressed stretch-draw is formed, intensity
It far can not guarantee.
Chinese patent CN102518443A discloses a kind of new method of ultra-shallow earth-covered heterotypic channel special type combination construction, uses
It, just can not operation again because the driving of underground causes overburden layer to collapse when the top soil layer for solving construction of underground tunnel face is relatively thin
The problem of construction, is tunneled by the rectangular development machine of the top little module of the construction surface of the subterranean tunnel in ultra-shallow earth-covered layer,
It is pushed into rectangular steel tube section by section, forms a transversely arranged pipe curtain, then uses and places armored concrete behind big section excavator
Box culvert displacement pipe curtain is constructed.It still needs box culvert, can not solve the corresponding bring above problem.
Chinese patent CN205172598U discloses a kind of pipe curtain rotary churning pile supporting construction, if including main pipe curtain steel pipe, often
At least one horizontal jet grouting stake is provided between two pipe curtain steel pipes, and pipe curtain steel pipe and the edge of horizontal jet grouting stake closely connect
Touching, pipe curtain steel pipe combine the common supporting stress system for forming big rigidity together with horizontal jet grouting stake.Horizontal jet grouting stake is set, is applied
Work difficulty is big, and can bring many new problems, as permanent structure, it is difficult to proof strength and required precision.
Summary of the invention
The purpose of the present invention is to provide a kind of New pipe curtain construction technologies --- the purlin Xia Lu form prestressing force pipe-roof method, solution
The above problem of having determined and risk.The purlin Xia Lu form prestressing force pipe-roof method, be it is a kind of using the steel unit at two angles as laterally answer in advance
The job location of power muscle, while by prestressing force in length and breadth, several independent components of pipe curtain surrounding are tightly bound round together, and is supported on
On the abutment at tunnel both ends, to control the deformation of pipe curtain, improve the globality of pipe curtain, so reach higher safety and
The construction method of economy.The system uses post-tensioning soap-free emulsion polymeization full prestressing system, is formed respectively by crack grouting and prestressing force
Being reliably connected between component.Waterproof requirement is realized by lock and grouting between each component.Corner steel unit is using cast-in-place mixed
Solidifying soil, guarantees connection stiffness.Support of the abutment as prestressed girder, undertakes the power transmitted from top, and be transmitted to ground.
According to above-mentioned purpose, the technical scheme adopted by the invention is that:
A kind of purlin Xia Lu form prestressed pipe curtain structure, the structure is by several precast concrete beams, two pre-manufactured steel lists
Member, two abutments, transversely prestressed bars and longitudinal prestressing muscle composition；Several beams of concretes pass through lock and crack
Grouting is connected, and forms entirety by the tensioning transversely prestressed bars and longitudinal prestressing muscle；Described two pre-manufactured steel lists
Member is placed in two upper left, upper right angle points, and the operation platform as transversely prestressed bars, applies for several precast concrete beams
Transverse prestress；Support of described two abutments as prestressed girder, undertakes the power transmitted from top, and be transmitted to ground.
Further, described two pre-manufactured steel units, can be by placing steel reinforcement cage, and cast-in-place concrete forms rigid joint.
Further, it is provided with transversely prestressed bars preformed hole on the precast concrete beam and longitudinal prestressing muscle is reserved
Hole.
Further, the transversely prestressed bars preformed hole distinguishes two in the tension and compression of the upper lower edge of the precast concrete beam
Arrangement is set；And/or the longitudinal prestressing muscle preformed hole is arranged in the surrounding of the precast concrete beam.
Further, the transversely prestressed bars use unbonded prestressing tendon.
Further, the structure is the purlin separate type Xia Lu prestressed pipe curtain form, it may be assumed that main couple is separated with abutment；Or
Person, the purlin monoblock type Xia Lu prestressed pipe curtain form, it may be assumed that main couple is not separated with abutment.
A kind of construction method using the purlin the Xia Lu form prestressed pipe curtain structure of is also provided, is pushed up according to first top
Plate, subsequent both sides side wall, the sequence of last abutment are constructed, and top board construction includes the following steps:
Step A: tool steel pipe top into；
Step B: the displacement of precast concrete beam promotes:
After shifting position onto tool steel pipe top, in same position pushing tow precast concrete beam come the tool of pushing tow before replacing
Steel pipe；
Step C: pre-manufactured steel unit jacking:
After entire row precast concrete beam whole pushing tow in place after, in both ends precast concrete beam adjacent position pushing tow in parallel
Enter pre-manufactured steel unit；
Step D: apply transverse prestress and joint filling grouting:
In pre-manufactured steel unit, transversely prestressed bars are penetrated perpendicular to precast concrete beam, to whole transversely prestressed bars
After penetrating, it is filled into mortar in the crack, tensioning finally is carried out to transversely prestressed bars in pre-manufactured steel unit, to pipe curtain
Apply transverse prestress.
Further, the step A specifically: excavating Starting Well and received well, and installing and promote pallet and push away
Into after device, by tool steel pipe, to be mounted on the development machine of stem as guidance, the design position of merogenesis pushing tow to precast concrete beam
Set place；
In the step B: the precast concrete beam is merogenesis jacking, in precast concrete beam pushing tow into after the soil body,
Apply longitudinal prestressing between every section precast concrete beam, is connected by the prestressing force between section and section by whole concrete
Tu Liang is connected, and becomes full-prestressed concrete beam；
In the step C, after the pre-manufactured steel unit jacking in place, arrangement of reinforcement and as cast-in-place concrete inside it
Template, while also being ultimately resided in overall structure as the workspace of transverse prestress；And/or
Crack part in the step D, before penetrating presstressed reinforcing steel, between cleaning element.
Further, during precast concrete beam pushing tow, tool steel pipe recycles in received well and for adjacent bit
The precast concrete beam jacking set；And/or the pre-manufactured steel unit is merogenesis jacking, using site welding between section and section
Mode is as connection.
It further, further include step E: after the pipe curtain construction to top plate, two sidewalls and abutment, to pre-manufactured steel list
First internal placement steel reinforcement cage, cast-in-place concrete form rigid joint；
Step F: above-mentioned steps completion after, reach design strength to concrete, in internal spoil body, and to pipe curtain inside
It constructs.
The beneficial effects of the present invention are:
1, the normal traffic on top road surface is not influenced
For the present invention before precast concrete beam jacking, first jacking is mounted with the tool steel pipe of the edge of a knife, carries out cutting for the soil body
It cuts, so that ambient enviroment is effectively controlled in the case where not disturbing surrounding soil normal use, followed by beam and steel pipe
Jacking displacement, control sedimentation, the influence to upper base road be dramatically reduced.
The present invention effectively controls the amount of deflection of pipe curtain entirety due to prestressed use, to guarantee top road surface just
It is often used.
The present invention is due to the displacement propelling method using precast concrete beam, even if it is bad to encounter soil body situation, comprising gravel,
Cobble or barrier also can guarantee the precision of higher propulsion.
2, construction quality is high
The present invention is due to precast concrete beam and pre-manufactured steel unit is prefabricated in the factory forms, and pipelining makes component
Quality is able to strict control, so there is sufficient q&r to guarantee.
The present invention is since structure main material is strong concrete, so having excellent corrosion resistance and durability.
3, lower cost, shorter duration
The present invention reduces and temporarily takes since the purlin Xia Lu form prestressed pipe curtain directly serves as a part of permanent structure
The expense of box culvert needed for additional work process brought by building and expense, such as traditional pipe-roof method.
The present invention improves the absolute altitude of integrated engineering since structure size reduces, so that earthwork excavated volume reduces, thus it is whole
Duration and engineering cost all reduced.
4, it is higher to excavate safety
After the road Zhong Xia of the present invention purlin form prestressed pipe curtain is formed, overall structure has been formed, inside tunneling
The soil body when substantially without risk.
5, mechanization degree is high
The present invention saves a large amount of labours, simultaneously from the excavation for being advanced to tunnel internal, the work of a succession of mechanization
But also engineering management is more efficiently and conveniently.
Form prestressing force pipe-roof method in the purlin Xia Lu proposed by the present invention, a large amount of prefabricated structures using standardized production in the factory
Part, enough guarantee well-formed stress performance, and have simple structure, speed of application is fast, overall stiffness is big, saving construction cost and
The advantages that duration, has broad application prospects in Underground Construction, especially Municipal Engineering Construction, meets China's green
The development strategy of building and industrialized building.
Detailed description of the invention
The road Tu1Wei Xia purlin form prestressed pipe curtain structure overall effect figure；
Fig. 2 is the purlin monoblock type Xia Lu prestressed pipe curtain structure cross-sectional view；
Fig. 3 is the purlin separate type Xia Lu prestressed pipe curtain structure cross-sectional view；
Fig. 4 between precast concrete beam between latch schematic diagram；
Fig. 5 is the thin portion structural schematic diagram of pre-manufactured steel unit；
Appended drawing reference in figure:
1- precast concrete beam, 2- pre-manufactured steel unit, 3- abutment, 4- transversely prestressed bars, 5- longitudinal prestressing muscle, 6- are horizontal
To presstressed reinforcing steel preformed hole, 7- longitudinal prestressing muscle preformed hole, 8- main couple.
Specific embodiment
Below by the description to optimum embodiment, specific embodiments of the present invention will be described in further detail.
A kind of purlin Xia Lu form prestressing force pipe-roof method proposed by the present invention, if as shown in Figure 1, the structure type is by intervening
The pre-manufactured steel unit 2, two of beams of concrete 1, two abutment 3, transversely prestressed bars 4 and longitudinal prestressing muscle 5 processed form.It is several
Beams of concrete 1 is connected by lock and crack grouting, and passes through 5 shape of tensioning transversely prestressed bars 4 and longitudinal prestressing muscle
It is integral；Two pre-manufactured steel units 2 are placed in two upper left, upper right angle points, and flat as the construction of transversely prestressed bars 4
Platform applies transverse prestress for several precast concrete beams 1, and eventually by steel reinforcement cage is placed, cast-in-place concrete forms rigid joint,
Guarantee stress；Support of two abutments 3 as prestressed girder, undertakes the power transmitted from top, and be transmitted to ground.As shown,
Two abutments 3 are located at the both ends of pipe curtain, connect with each precast concrete beam 1.
The invention mainly comprises two different structure types, under the purlin monoblock type Xia Lu prestressed pipe curtain form and separate type
Road purlin prestressed pipe curtain form, the main distinction are whether main couple 8 separates with abutment.As shown in Figures 2 and 3, it is respectively
The purlin monoblock type Xia Lu prestressed pipe curtain structure cross-sectional view and the purlin separate type Xia Lu prestressed pipe curtain structure cross-sectional view.
Each prefabricated components in the form of the purlin Xia Lu are mainly compressed by longitudinal prestressing, are worked together.For monoblock type knot
Load is transmitted to downwards basis on the abutment of two sides by structure, beam freely-supported；For separate structure, beam freely-supported is in two sides main truss
On, main truss delivers load to abutment again, then passes to basis.Such longitudinal direction power transmission mode prolong structure can laterally
Exhibition is suitable for wide and short underground structure, such as multilane pass through the engineering of relatively short distance.
It is illustrated in figure 4 between precast concrete beam and latches schematic diagram；Joint detail figure is given in figure, two pieces of left and right is pre-
It is connected between beams of concrete 1 processed by lock, internal later period grouting.On opposite two faces of the precast concrete beam 1
Be arranged it is fluted, it is described lock be located at the groove in.
It is illustrated in figure 5 pre-manufactured steel unit thin portion structural schematic diagram；The prefabricated rigid unit 2 is generally rectangular structure,
All corresponding sites being in contact with precast concrete beam 1, are provided with transversely prestressed bars preformed hole 6, laterally answer in advance for making
Power muscle 4 passes through the prefabricated rigid unit 2 and precast concrete beam 1.
Concrete construction method:
Firstly, Starting Well and received well are excavated respectively in the building two sides for needing pipe curtain to pass through, later according to first top
Top plate, subsequent both sides side wall, the sequence of last abutment carry out the purlin the Xia Lu form prestressed pipe curtain construction of three parts.
This two-part construction process of above-mentioned top plate, side wall is roughly the same, mainly including precast concrete beam jacking and in advance
Stress tension.Below just by taking top board construction as an example, it is explained in detail.
A, tool steel pipe top into
Starting Well and received well are being excavated, and after installing and promoting pallet and propeller, by tool steel pipe, with installation
It is to guide in the development machine of stem, at the design position of merogenesis pushing tow to precast concrete beam.
One important function of tool steel pipe is exactly to lead to the soil at precast concrete beam position during pushing tow
It crosses steel pipe to transport, i.e., replaces the soil body of the part with tool steel pipe, and undertake its original intermal force, effectively control and apply
Influence of the work to ambient enviroment.
B, the displacement of precast concrete beam promotes
After shifting position onto tool steel pipe top, in same position pushing tow precast concrete beam 1 come the work of pushing tow before replacing
Has steel pipe.After precast concrete back 1 promotes the soil body, apply longitudinal prestressing between every section precast concrete beam, leads to
The prestressing force between section of celebrating a festival, which is connect, is connected whole precast concrete beam, becomes full-prestressed concrete beam；Apply longitudinal pre-
When stress, the longitudinal prestressing muscle preformed hole 7 of 1 surrounding of precast concrete beam distribution is passed through by longitudinal prestressing muscle 5 to implement；
During precast concrete beam pushing tow, tool steel pipe recycles in received well and is used for the precast concrete back of adjacent position
Into.
C, pre-manufactured steel unit jacking
After the whole pushing tows of entire row precast concrete beam 1 in place after, at both ends, 1 adjacent position of precast concrete beam is pushed up in parallel
It is pushed into pre-manufactured steel unit 2.With tool steel pipe before the difference is that will not be replaced again after pre-manufactured steel unit jacking in place
Out, it but in internal arrangement of reinforcement and as the template of cast-in-place concrete, while also finally being stayed as the workspace of transverse prestress
It is not removed in overall structure.Pre-manufactured steel unit and precast concrete beam are merogenesis jacking, using scene between section and section
The mode of welding is as connection.
D, apply transverse prestress and joint filling grouting
Before penetrating presstressed reinforcing steel, precast concrete beam fore shaft is washed away with flowing water in crack part between cleaning element
Inside and outside satholith, this point are extremely important for the quality of entire engineering, if there are satholiths for inside, crack are caused to insert sand
Leakiness is starched, then can seriously affect the service life of presstressed reinforcing steel.
Then in pre-manufactured steel unit, unbonded prestressing tendon is laterally penetrated perpendicular to precast concrete beam 1, it may be assumed that laterally
Presstressed reinforcing steel 4, tension and compression of the presstressed reinforcing steel by transversely prestressed bars preformed hole 6 in the upper lower edge of precast concrete beam 1 distinguish two
Arrangement is set.After whole presstressed reinforcing steels penetrate, mortar is filled into crack, to play the role of waterproof and structure stress.
Tensioning finally is carried out to transversely prestressed bars 4 in pre-manufactured steel unit, transverse prestress is applied to pipe curtain.
E, pre-manufactured steel unit and abutment construction
Top plate and side wall be all made of more than construction process.Pipe curtain construction to upper plate, two sidewalls and abutment 3 finishes
Afterwards, to steel reinforcement cage is placed inside pre-manufactured steel unit, cast-in-place concrete forms rigid joint；
F, it finally excavates and completes
Above content completion after, reach design strength to concrete, it can in internal spoil body, and to pipe curtain inside
It constructs.
The above is only exemplarily described the present invention, it is clear that the present invention implements not by above-mentioned side
The limitation of formula, as long as using the inventive concept and technical scheme of the present invention, anyone skilled in the art can
Various improvement, the change or replacement readily occurred in, or it is not improved directly applying to other occasions, in protection of the invention
Within the scope of.
Claims (10)
1. a kind of purlin Xia Lu form prestressed pipe curtain structure, the pipe curtain structure by several precast concrete beams (1), two it is prefabricated
Steel unit (2), two abutments (3), transversely prestressed bars (4) and longitudinal prestressing muscle (5) composition；Several concretes
It is connected between Tu Liang (1) by lock and crack grouting, and is answered in advance by transversely prestressed bars (4) described in tensioning and longitudinal direction
Power muscle (5) forms whole；Described two pre-manufactured steel units (2) are placed in two upper left of the pipe curtain structure, upper right angle points, and
As the operation platform of transversely prestressed bars (4), apply transverse prestress for several precast concrete beams (1)；Described two bridges
Platform (3) is used as support, undertakes the power transmitted from top and is transmitted to ground.
2. form prestressed pipe curtain structure in the purlin Xia Lu as described in claim 1, it is characterised in that: described two pre-manufactured steel units
(2), can be by placing steel reinforcement cage, cast-in-place concrete forms rigid joint.
3. form prestressed pipe curtain structure in the purlin Xia Lu as described in claim 1, it is characterised in that: the precast concrete beam
(1) and on the pre-manufactured steel unit (2) it is provided with transversely prestressed bars preformed hole (6), the precast concrete beam (1) also sets
It is equipped with longitudinal prestressing muscle preformed hole (7)；The transversely prestressed bars preformed hole (6) is for placing transversely prestressed bars (4), institute
Longitudinal prestressing muscle preformed hole (7) is stated for placing longitudinal prestressing muscle (5).
4. form prestressed pipe curtain structure in the purlin Xia Lu as claimed in claim 3, it is characterised in that: the transversely prestressed bars are pre-
Two rows of arrangements are distinguished in the tension and compression of (6) at the edge of the precast concrete beam (1) of boxing out；And/or the longitudinal prestressing muscle is pre-
Box out (7) the precast concrete beam (1) surrounding arrange.
5. form prestressed pipe curtain structure in the purlin Xia Lu as described in claim 1, it is characterised in that: the transversely prestressed bars
(4) unbonded prestressing tendon is used.
6. form prestressed pipe curtain structure in the purlin Xia Lu a method as claimed in any one of claims 1 to 5, it is characterised in that: the pipe curtain structure
For the purlin separate type Xia Lu prestressed pipe curtain form, it may be assumed that main couple is separated with abutment；Alternatively, the pipe curtain structure is under monoblock type
Road purlin prestressed pipe curtain form, it may be assumed that main couple is not separated with abutment.
7. a kind of construction method using any purlin the Xia Lu form prestressed pipe curtain structure of claim 1-6, according to elder generation
Top top plate, subsequent both sides side wall, the sequence of last abutment are constructed, and top board construction includes the following steps:
Step A: tool steel pipe top into；
Step B: the displacement of precast concrete beam (1) promotes:
After shifting position onto tool steel pipe top, in same position pushing tow precast concrete beam (1) come the tool of pushing tow before replacing
Steel pipe；
Step C: pre-manufactured steel unit (2) jacking:
After the whole pushing tows of entire row precast concrete beam (1) in place after, at both ends, precast concrete beam (1) adjacent position is pushed up in parallel
It is pushed into pre-manufactured steel unit (2)；
Step D: apply transverse prestress and joint filling grouting:
In pre-manufactured steel unit (2), transversely prestressed bars (4) are penetrated perpendicular to precast concrete beam (1), to all laterally answer in advance
After power muscle (4) penetrates, mortar is filled into the crack, finally in pre-manufactured steel unit (2) to transversely prestressed bars (4) into
Row tensioning applies transverse prestress to pipe curtain.
8. construction method as claimed in claim 7, it is characterised in that:
The step A specifically: Starting Well and received well are being excavated, and after installing and promoting pallet and propeller, by work
Has steel pipe, to be mounted on the development machine of stem for guidance, at the design position of merogenesis pushing tow to precast concrete beam；And/or
In the step B: the precast concrete beam (1) is merogenesis jacking, right in precast concrete beam pushing tow into after the soil body
Apply longitudinal prestressing between every section precast concrete beam, is connected by the prestressing force between section and section by whole precast concrete
Beam is connected, and becomes full-prestressed concrete beam；And/or
In the step C, after pre-manufactured steel unit (2) jacking in place, arrangement of reinforcement and as cast-in-place concrete inside it
Template, while also being ultimately resided in overall structure as the workspace of transverse prestress；And/or
Crack part in the step D, before penetrating presstressed reinforcing steel (4), between cleaning element.
9. construction method as claimed in claim 7 or 8, it is characterised in that: during precast concrete beam (1) pushing tow, work
Tool steel pipe recycles in received well and is used for precast concrete beam (1) jacking of adjacent position；And/or the pre-manufactured steel unit
It (2) is merogenesis jacking, as connection by the way of site welding between section and section.
10. construction method as claimed in claim 7, it is characterised in that:
It further include step E: after the pipe curtain construction to top top plate, both sides side wall and abutment, in pre-manufactured steel unit (2)
Steel reinforcement cage is placed in portion, and cast-in-place concrete forms rigid joint；
Step F: after above-mentioned steps completion, reaching design strength to concrete, in internal spoil body, and to progress inside pipe curtain
Construction.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710892360.0A CN109555535B (en) | 2017-09-27 | 2017-09-27 | Lower-way truss type prestressed pipe curtain structure and construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710892360.0A CN109555535B (en) | 2017-09-27 | 2017-09-27 | Lower-way truss type prestressed pipe curtain structure and construction method |
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| CN109555535B CN109555535B (en) | 2021-06-15 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113279787A (en) * | 2021-05-24 | 2021-08-20 | 苏州大学 | Construction method for building pipe curtain supporting structure of ultra-shallow buried large-section underground excavation subway station |
| CN113339000A (en) * | 2021-06-03 | 2021-09-03 | 上海市城市建设设计研究总院（集团）有限公司 | Cable steel pipe shell trenchless supporting structure with intermediate wall and construction method |
| CN113339004A (en) * | 2021-06-03 | 2021-09-03 | 上海市城市建设设计研究总院（集团）有限公司 | Prestressed steel structure advanced support and construction method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113279787A (en) * | 2021-05-24 | 2021-08-20 | 苏州大学 | Construction method for building pipe curtain supporting structure of ultra-shallow buried large-section underground excavation subway station |
| CN113339000A (en) * | 2021-06-03 | 2021-09-03 | 上海市城市建设设计研究总院（集团）有限公司 | Cable steel pipe shell trenchless supporting structure with intermediate wall and construction method |
| CN113339004A (en) * | 2021-06-03 | 2021-09-03 | 上海市城市建设设计研究总院（集团）有限公司 | Prestressed steel structure advanced support and construction method |
| CN113339004B (en) * | 2021-06-03 | 2023-01-24 | 上海市城市建设设计研究总院（集团）有限公司 | Construction method of prestressed steel structure advanced support |
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| CN109555535B (en) | 2021-06-15 |
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