CN106761814A - A kind of pipe curtain and bamboo reinforcement grouted anchor bar combined retaining structure and method - Google Patents

A kind of pipe curtain and bamboo reinforcement grouted anchor bar combined retaining structure and method Download PDF

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Publication number
CN106761814A
CN106761814A CN201710069717.5A CN201710069717A CN106761814A CN 106761814 A CN106761814 A CN 106761814A CN 201710069717 A CN201710069717 A CN 201710069717A CN 106761814 A CN106761814 A CN 106761814A
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CN
China
Prior art keywords
pipe
anchor bar
curtain
grouted anchor
bamboo reinforcement
Prior art date
Application number
CN201710069717.5A
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Chinese (zh)
Inventor
胡俊
卫宏
刘勇
李玉萍
姚凯
佳琳
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海南大学
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Priority to CN201710069717.5A priority Critical patent/CN106761814A/en
Publication of CN106761814A publication Critical patent/CN106761814A/en

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Classifications

    • 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
    • E21D11/003Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
    • 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
    • E21D11/18Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D20/00Setting anchoring-bolts
    • E21D20/02Setting anchoring-bolts with provisions for grouting
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L1/00Laying or reclaiming pipes; Repairing or joining pipes on or under water
    • F16L1/024Laying or reclaiming pipes on land, e.g. above the ground
    • F16L1/028Laying or reclaiming pipes on land, e.g. above the ground in the ground

Abstract

The invention discloses a kind of pipe curtain and bamboo reinforcement grouted anchor bar combined retaining structure and method, supporting construction includes several pipe curtain steel pipes and several horizontal bamboo reinforcement grouted anchor bars, pipe curtain steel pipe is alternately arranged with horizontal bamboo reinforcement grouted anchor bar, and the common supporting stress system to form big rigidity is combined together with the reinforcement grouting curtain that pipe curtain steel pipe is formed with horizontal bamboo reinforcement grouted anchor bar.Cement concrete is filled with pipe curtain steel pipe.Method for protecting support is:Step one, construct upper pipe working well and received well;Step 2, pipe curtain steel pipe are laid;Step 3, the construction of bamboo reinforcement grouted anchor bar and slip casting;Step 4, the fill concrete in pipe curtain steel pipe;Step 5, while excavate while support;Step 6, internal structure is constructed paragraph by paragraph, ultimately form complete underground structure.Beneficial effect:Ensure construction and operation security, duration and cost can be saved;The rigidity of supporting construction is greatly improved, can effectively control earth's surface to deform, security is good.

Description

A kind of pipe curtain and bamboo reinforcement grouted anchor bar combined retaining structure and method

Technical field

The present invention relates to a kind of combined retaining structure and method, more particularly to a kind of pipe curtain combines branch with bamboo reinforcement grouted anchor bar Protection structure and method.

Background technology

At present, with the acceleration of Urbanization Process In China, Large Underground knot is built under downtown roads or important building Structure is more and more.It is uneconomical using shield construction for shallow embedding big cross section, short-range city tunnel, using open cut Method disturbs larger to city production and living.When geological conditions is poor, buried depth is shallower, Sensitive Buildings are arranged at top, if adopted Constructed with shallow burial hidden digging, surface subsidence is difficult to control to, once there is construction accident, will cause significant social influence.Therefore, How a kind of construction method that is suitable for the shallow large-section underground structure of saturation rich water soft soil layer under wear Sensitive Buildings is found It is extremely important.

Pipe-roof method is exactly to head into steel pipe in proposed underground structure surrounding first with pipe-jacking technology, using lock between steel pipe Mouth etc. carries out sealing, forms the watertightness underground space, then under the protection of big rigidity pipe curtain, surrounds the scope soil body to pipe curtain and enters Row is excavated and pours a kind of method of agent structure.Because pipe curtain forms big rigidity temporary support structures, it is possible to reduce during excavation The earth's surface that causes deforms, it is to avoid produce influence to surrounding building, and, environment intensive for shallow embedding big cross section weak soil, building is protected Shield requires engineering high, with unrivaled advantage.

Anchorage technology is an important branch in Geotechnical Engineering, the biggest advantage is that can be added using tensile materials The stability of the strong soil body itself.Compared with traditional liner structure, it belongs to a kind of active control measures, it is ensured that inside Rock And Soil Stress field is interference-free, is a kind of advanced technological means.In recent years, with a large amount of construction of underground engineering, mechanized construction Degree is improved constantly, and novel anchor rod technology emerges in an endless stream.

Bamboo reinforcement grouted anchor bar is a kind of new grouted anchor bar technology.Bamboo reinforcement grouted anchor bar is mainly made up of two parts: Part I is the reinforcement anchorage element of bamboo reinforcement silver;Part II is grouting pipeline component, and stop grouting plug can be inserted in Grouting Pipe It is oriented localization slip casting.It is mainly used in the soil body anchoring improvement in the larger mechanized construction engineering of difficulty of construction, easily digs Except property and economy are one of the main feature of bamboo reinforcement grouted anchor bar better than steel Grouting Pipe etc..

The content of the invention

The main object of the present invention is to effectively control the loss of underground water, it is ensured that construction and operation security;

It is a further object to provide a kind of shallow embedding big cross section underground for being suitable as saturation rich water soft soil layer The supporting construction and method for protecting support when Sensitive Buildings are constructed are worn under structure.

The present invention be in order to achieve the above object and provide a kind of pipe curtain with bamboo reinforcement grouted anchor bar combined retaining structure and Method.

Pipe curtain and the bamboo reinforcement grouted anchor bar combined retaining structure that the present invention is provided include several pipe curtain steel pipes and several water Flat bamboo reinforcement grouted anchor bar, pipe curtain steel pipe is alternately arranged with horizontal bamboo reinforcement grouted anchor bar, pipe curtain steel pipe and horizontal bamboo reinforcement grouted anchor bar The reinforcement grouting curtain of formation combines the common supporting stress system to form big rigidity together.

Cement concrete is filled with pipe curtain steel pipe.

Pipe curtain and bamboo reinforcement grouted anchor bar Support Method that the present invention is provided, its method are as described below:

Step one, construct upper pipe working well and received well;

Step 2, pipe curtain steel pipe are laid, and laying order is symmetrically to be carried out from lower to upper on the basis of the axis of cross section;

Horizontal bamboo reinforcement grouted anchor bar construction and slip casting, form horizontal reinforcement slip casting between steel pipe between step 3, pipe curtain steel pipe Curtain, the number of horizontal bamboo reinforcement grouted anchor bar is by depending on the steel pipe spacing that designs;

Step 4, the as needed fill concrete in pipe curtain steel pipe;

Step 5, the excavation in pipe curtain with bamboo reinforcement grouted anchor bar combined retaining structure, support when excavating;

Step 6, internal structure is constructed paragraph by paragraph, and progressively remove pipe curtain churning method supporting construction inner support, ultimately formed Whole underground structure.

There is pipe curtain steel pipe distribution method in step 2:Directional drilling method, horizontal spiral drilling method, rammer pipe construction method, push pipe Method and miniature push bench process, the construction method of wherein push bench process are as follows:

(1) preparation of pipe curtain steel pipe:Pipe curtain diameter of steel tube takes 0.3m-2m;

(2) soil stabilization:First the soil body at hole is reinforced by design requirement before pipe curtain steel pipe jacking, soil stabilization can Carried out in construction of working shaft;

(3) it is through walls to appear:Pre-buried steel box outside plate is first sliced off before appearing, and water-stopping steel boxing is connected to pre-buried steel box Outside, then by watertight rubber circle be arranged on sealing steel loop on, prepare appear when, by steel box inner side earth-retaining steel plate slice off, clearly Tool heads are advanced into embedded hole immediately after debris in reason preformed hole, shortens the dead time, watertight rubber circle is hugged tool heads Shell plays sealing effect, to prevent tool heads from dropping when push pipe is through walls, smaller because burying at the initial stage through walls, tool heads Only by 2 points of supports, wherein being some guide rail, on the other hand bury the shallower soil body for deadweight, on the one hand will with one it is upward just Beginning angle, rest will be arranged at another aspect wall pipe bottom, and strengthen the connection between pipeline section and tool pipe, pipeline section and pipeline section, this Outward, the propulsion of tool pipe must be rapid, does not make the soil body open-assembly time in wall pipe oversize;

(4) normal jacking:After pipeline is appeared successfully, start normal jacking, while tube coupling is advanced, push-bench semi shield oil cylinder The soil body discharge of cutting front, is pushed ahead successively by tube coupling one, and the continuous propulsion of push-bench is last to reach received well, forms whole section Passage;

(5) pipe curtain steel pipe landing edge:Joint reinforces pipe end by welding annular and vertical reinforced plate, increases its firm Degree, on the annular stiffened panel that it is reinforced, connecting bolt carries out the spacing and fixation in work progress, and two are set on socket Road neoprene packing circle carries out waterproof, and joint will have the adaptability of certain corner;

(6) received well is entered:After push-bench reaches soil stabilization scope close to before received well, move speed should be slowed down, made Push-bench slowly cuts the soil body, forms a more complete sealing hole, and the particular location that push-bench is exported is made by measurement, will The concrete guard wall of received well tool head position cuts, and when push-bench enters received well side, push-bench wants fast jacking, until Push-bench ejects received well completely;

(7) pipe curtain mud displacement:After pipe curtain jacking terminates, there is delayed sedimentation to prevent pipe curtain, by design requirement Material displaces the thixotropic slurry in jack-in process, and the system and pipeline during displacement using pressure injection thixotropic slurry are carried out, pressure injection Sequentially:Carried out backward successively from first segment pipe;

(8) pipe curtain filling concrete and filling:After pipe curtain jacking is completed, it is filled using slightly expanded concrete, is applied Whether it is closely connected with hammering and ultrasound examination concrete compaction degree and between steel pipe after work is complete;

(9) pipe curtain lubrication drag reduction:In using the annulus between bentonite thixotropic slurry flow in pipes and surrounding soil layer, Realize reducing the frictional resistance between jacking pipeline and stratum, slip casting is three parts, tail synchronous slip casting, along the line pipeline mend slurry and Slip casting at hole, the basis of thixotropic slurry is made up of bentonite and water, in addition, being mixed according to the different soil bodys different poly- The outer-penetrating agent of compound adjusts mud property to meet use requirement.

The construction requirement of horizontal bamboo reinforcement grouted anchor bar construction is as follows in step 3:

In the bamboo reinforcement grouted anchor bar near underground structure apart from internal structure side 300-400mm, every bamboo reinforcement grouted anchor bar Perforate spacing be 0.5-0.8m, the length of bamboo reinforcement grouted anchor bar is along the elongated arrangement of underground structure length, bamboo reinforcement grouted anchor bar Slip casting pipe diameter be usually 108mm or 127mm.

Directional drilling method, horizontal spiral drilling method and rammer pipe construction method in pipe curtain steel pipe distribution method are existing disclosure More ripe engineering method, therefore specific method do not repeated further.

The drilling construction of pipe curtain steel pipe and horizontal bamboo reinforcement grouted anchor bar is also existing engineering method, therefore specific method does not also enter One step is repeated.

Beneficial effects of the present invention:

The present invention is that pipe curtain steel pipe support form is combined with horizontal bamboo reinforcement grouted anchor bar support form, forms big firm Degree watertightness pipe curtain and bamboo reinforcement grouted anchor bar combined retaining structure, can effectively control the loss of underground water, it is ensured that construction and fortune Battalion's safety, is particularly suitable as under the shallow large-section underground structure of saturation rich water soft soil layer wearing branch when Sensitive Buildings are constructed Protection structure.

Compared with existing pipe-roof method, the quantity of pipe curtain steel pipe of the present invention can be reduced largely, the pipe curtain steel pipe branch of reduction Shield effect is replaced by horizontal reinforcement grouting curtain, can save duration and cost;With single horizontal grouting bolt support form phase Than, the rigidity of supporting construction is greatly improved, can effectively control earth's surface to deform, security is good.Present invention is especially suited for as saturation Supporting construction when Sensitive Buildings are constructed is worn under the shallow large-section underground structure of rich water soft soil layer.

Brief description of the drawings

Fig. 1 is supporting construction schematic diagram of the present invention.

1st, pipe curtain steel pipe 2, horizontal bamboo reinforcement grouted anchor bar 3, cement concrete.

Specific embodiment

Refer to shown in Fig. 1:

Pipe curtain and the bamboo reinforcement grouted anchor bar combined retaining structure that the present invention is provided include several pipe curtain steel pipes 1 and several water Flat bamboo reinforcement grouted anchor bar 2, pipe curtain steel pipe 1 is alternately arranged with horizontal bamboo reinforcement grouted anchor bar 2, pipe curtain steel pipe 1 and horizontal bamboo reinforcement slip casting The reinforcement grouting curtain that anchor pole 2 is formed combines the common supporting stress system to form big rigidity together.

Cement concrete 3 is filled with pipe curtain steel pipe 1.

Pipe curtain and bamboo reinforcement grouted anchor bar Support Method that the present invention is provided, its method are as described below:

Step one, construct upper pipe working well and received well;

Step 2, pipe curtain steel pipe 1 are laid, and laying order is symmetrically to be carried out from lower to upper on the basis of the axis of cross section;

The horizontal construction of bamboo reinforcement grouted anchor bar 2 and slip casting between step 3, pipe curtain steel pipe 1, form horizontal reinforcement note between steel pipe Slurry curtain, the number of horizontal bamboo reinforcement grouted anchor bar 2 is by depending on the steel pipe spacing that designs;

Step 4, as needed the filling concrete concrete 3 in pipe curtain steel pipe 1;

Step 5, the excavation in pipe curtain with bamboo reinforcement grouted anchor bar combined retaining structure, support when excavating;

Step 6, internal structure is constructed paragraph by paragraph, and progressively remove pipe curtain churning method supporting construction inner support, ultimately formed Whole underground structure.

There is the pipe curtain distribution method of steel pipe 1 in step 2:Directional drilling method, horizontal spiral drilling method, rammer pipe construction method, push pipe Method and miniature push bench process, the construction method of wherein push bench process are as follows:

(1) preparation of pipe curtain steel pipe 1:The pipe curtain diameter of steel pipe 1 takes 0.3m-2m;

(2) soil stabilization:First the soil body at hole is reinforced by design requirement before the pipe curtain jacking of steel pipe 1, soil stabilization Can be carried out in construction of working shaft;

(3) it is through walls to appear:Pre-buried steel box outside plate is first sliced off before appearing, and water-stopping steel boxing is connected to pre-buried steel box Outside, then by watertight rubber circle be arranged on sealing steel loop on, prepare appear when, by steel box inner side earth-retaining steel plate slice off, clearly Tool heads are advanced into embedded hole immediately after debris in reason preformed hole, shortens the dead time, watertight rubber circle is hugged tool heads Shell plays sealing effect, to prevent tool heads from dropping when push pipe is through walls, smaller because burying at the initial stage through walls, tool heads Only by 2 points of supports, wherein being some guide rail, on the other hand bury the shallower soil body for deadweight, on the one hand will with one it is upward just Beginning angle, rest will be arranged at another aspect wall pipe bottom, and strengthen the connection between pipeline section and tool pipe, pipeline section and pipeline section, this Outward, the propulsion of tool pipe must be rapid, does not make the soil body open-assembly time in wall pipe oversize;

(4) normal jacking:After pipeline is appeared successfully, start normal jacking, while tube coupling is advanced, push-bench semi shield oil cylinder The soil body discharge of cutting front, is pushed ahead successively by tube coupling one, and the continuous propulsion of push-bench is last to reach received well, forms whole section Passage;

(5) the pipe curtain landing edge of steel pipe 1:Joint reinforces pipe end by welding annular and vertical reinforced plate, increases it Rigidity, on the annular stiffened panel that it is reinforced, connecting bolt carries out spacing and fixed, the setting on socket in work progress Twice neoprene packing circle carries out waterproof, and joint will have the adaptability of certain corner;

(6) received well is entered:After push-bench reaches soil stabilization scope close to before received well, move speed should be slowed down, made Push-bench slowly cuts the soil body, forms a more complete sealing hole, and the particular location that push-bench is exported is made by measurement, will The concrete guard wall of received well tool head position cuts, and when push-bench enters received well side, push-bench wants fast jacking, until Push-bench ejects received well completely;

(7) pipe curtain mud displacement:After pipe curtain jacking terminates, there is delayed sedimentation to prevent pipe curtain, by design requirement Material displaces the thixotropic slurry in jack-in process, and the system and pipeline during displacement using pressure injection thixotropic slurry are carried out, pressure injection Sequentially:Carried out backward successively from first segment pipe;

(8) pipe curtain filling concrete and filling:After pipe curtain jacking is completed, it is filled using slightly expanded concrete, is applied Whether it is closely connected with hammering and ultrasound examination concrete compaction degree and between steel pipe after work is complete;

(9) pipe curtain lubrication drag reduction:In using the annulus between bentonite thixotropic slurry flow in pipes and surrounding soil layer, Realize reducing the frictional resistance between jacking pipeline and stratum, slip casting is three parts, tail synchronous slip casting, along the line pipeline mend slurry and Slip casting at hole, the basis of thixotropic slurry is made up of bentonite and water, in addition, being mixed according to the different soil bodys different poly- The outer-penetrating agent of compound adjusts mud property to meet use requirement.

The construction requirement of the horizontal construction of bamboo reinforcement grouted anchor bar 2 is as follows in step 3:

In the bamboo reinforcement grouted anchor bar near underground structure apart from internal structure side 300-400mm, every bamboo reinforcement grouted anchor bar Perforate spacing be 0.5-0.8m, the length of bamboo reinforcement grouted anchor bar is along the elongated arrangement of underground structure length, bamboo reinforcement grouted anchor bar Slip casting pipe diameter be usually 108mm or 127mm.

Directional drilling method, horizontal spiral drilling method and rammer pipe construction method in the pipe curtain distribution method of steel pipe 1 are existing public affairs More ripe engineering method is opened, therefore specific method is not repeated further.

The drilling construction of pipe curtain steel pipe 1 and horizontal bamboo reinforcement grouted anchor bar 2 is also existing engineering method, therefore specific method does not have yet Further repeated.

Claims (5)

1. a kind of pipe curtain and bamboo reinforcement grouted anchor bar combined retaining structure, it is characterised in that:Include several pipes curtain steel pipes and several Horizontal bamboo reinforcement grouted anchor bar, pipe curtain steel pipe is alternately arranged with horizontal bamboo reinforcement grouted anchor bar, pipe curtain steel pipe and horizontal bamboo reinforcement slip casting anchor The reinforcement grouting curtain that bar is formed combines the common supporting stress system to form big rigidity together.
2. a kind of pipe curtain according to claim 1 and bamboo reinforcement grouted anchor bar combined retaining structure, it is characterised in that:Described Cement concrete is filled with pipe curtain steel pipe.
3. a kind of pipe curtain and bamboo reinforcement grouted anchor bar Support Method, it is characterised in that:Its method is as described below:
Step one, construct upper pipe working well and received well;
Step 2, pipe curtain steel pipe are laid, and laying order is symmetrically to be carried out from lower to upper on the basis of the axis of cross section;
Horizontal bamboo reinforcement grouted anchor bar construction and slip casting, form horizontal reinforcement grouting curtain between steel pipe between step 3, pipe curtain steel pipe, The number of horizontal bamboo reinforcement grouted anchor bar is by depending on the steel pipe spacing that designs;
Step 4, the as needed fill concrete in pipe curtain steel pipe;
Step 5, the excavation in pipe curtain with bamboo reinforcement grouted anchor bar combined retaining structure, support when excavating;
Step 6, internal structure is constructed paragraph by paragraph, and progressively remove pipe curtain churning method supporting construction inner support, ultimately form complete Underground structure.
4. a kind of pipe curtain according to claim 3 and bamboo reinforcement grouted anchor bar Support Method, it is characterised in that:Described There is pipe curtain steel pipe distribution method in step 2:Directional drilling method, horizontal spiral drilling method, ram pipe construction method, push bench process and miniature The construction method of push bench process, wherein push bench process is as follows:
(1) preparation of pipe curtain steel pipe:Pipe curtain diameter of steel tube takes 0.3m-2m;
(2) soil stabilization:First the soil body at hole is reinforced by design requirement before pipe curtain steel pipe jacking, soil stabilization can be in work Make to be carried out during well construction;
(3) it is through walls to appear:Pre-buried steel box outside plate is first sliced off before appearing, and water-stopping steel boxing is connected to the outer of pre-buried steel box Side, then watertight rubber circle is arranged on sealing steel loop, when preparing to appear, steel box inner side earth-retaining steel plate being sliced off, cleaning is pre- Tool heads are advanced into embedded hole immediately after debris in boxing out, shortens the dead time, watertight rubber circle is hugged tool heads shell Sealing effect is played, to prevent tool heads from dropping when push pipe is through walls, at initial stage through walls, the deadweight of tool heads smaller because burying Only by 2 points of supports, wherein being some guide rail, on the other hand bury the shallower soil body, on the one hand upward initial with one Rest will be arranged at angle, another aspect wall pipe bottom, and strengthen the connection between pipeline section and tool pipe, pipeline section and pipeline section, additionally, The propulsion of tool pipe must be rapid, does not make the soil body open-assembly time in wall pipe oversize;
(4) normal jacking:After pipeline is appeared successfully, start normal jacking, while tube coupling is advanced, the cutting of push-bench semi shield oil cylinder Front soil body discharge, is pushed ahead successively by tube coupling one, and constantly propulsion finally reaches received well to push-bench, forms whole section and leads to Road;
(5) pipe curtain steel pipe landing edge:Joint reinforces pipe end by welding annular and vertical reinforced plate, increases its rigidity, On the annular stiffened panel that it is reinforced, connecting bolt carries out spacing and fixed, the setting twice chlorine on socket in work progress Buna sealing ring carries out waterproof, and joint will have the adaptability of certain corner;
(6) received well is entered:After push-bench reaches soil stabilization scope close to before received well, move speed should be slowed down, make push pipe Machine slowly cuts the soil body, forms a more complete sealing hole, and the particular location that push-bench is exported is made by measurement, will receive The concrete guard wall of well tool head position cuts, and when push-bench enters received well side, push-bench wants fast jacking, until push pipe Machine ejects received well completely;
(7) pipe curtain mud displacement:After pipe curtain jacking terminates, there is delayed sedimentation to prevent pipe curtain, by the material of design requirement Thixotropic slurry in jack-in process is displaced, the system and pipeline during displacement using pressure injection thixotropic slurry are carried out, and pressure injection is sequentially: Carried out backward successively from first segment pipe;
(8) pipe curtain filling concrete and filling:After pipe curtain jacking is completed, it is filled using slightly expanded concrete, has been constructed After with hammering and ultrasound examination concrete compaction degree and between steel pipe it is whether closely connected;
(9) pipe curtain lubrication drag reduction:Using in the annulus between bentonite thixotropic slurry flow in pipes and surrounding soil layer, realize Reduce the frictional resistance between jacking pipeline and stratum, slip casting is three parts, and tail synchronous slip casting, along the line pipeline mend slurry and hole The slip casting at place, the basis of thixotropic slurry is made up of bentonite and water, in addition, mixing different polymer according to the different soil bodys Outer-penetrating agent mud property is adjusted meet use requirement.
5. a kind of pipe curtain according to claim 3 and bamboo reinforcement grouted anchor bar Support Method, it is characterised in that:Described The construction requirement of horizontal bamboo reinforcement grouted anchor bar construction is as follows in step 3:
In the bamboo reinforcement grouted anchor bar near underground structure apart from internal structure side 300-400mm, every bamboo reinforcement grouted anchor bar is opened Pitch of holes is 0.5-0.8m, and the length of bamboo reinforcement grouted anchor bar is along the elongated arrangement of underground structure length, the note of bamboo reinforcement grouted anchor bar Slurry pipe diameter is usually 108mm or 127mm.
CN201710069717.5A 2017-02-08 2017-02-08 A kind of pipe curtain and bamboo reinforcement grouted anchor bar combined retaining structure and method CN106761814A (en)

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CN101519880A (en) * 2009-03-02 2009-09-02 浙江大学 Method of using rotational multiaxial borehole pouring concrete occluding pile wall for enclosing deep foundation pit and slope protection project
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Publication number Priority date Publication date Assignee Title
CN109141716A (en) * 2018-08-16 2019-01-04 中铁二十局集团第工程有限公司 A kind of pipe gallery big cross section rectangular top pipe construction pipe-soil contact pressure test method
CN109113764A (en) * 2018-08-30 2019-01-01 中建七局第四建筑有限公司 A kind of pre support technique for tunnel construction
CN109113764B (en) * 2018-08-30 2020-01-10 中建七局第四建筑有限公司 Pre-support process for tunnel engineering construction

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