CN207420589U - Subway tunnel concrete spraying equipment - Google Patents

Abstract

The utility model is related to a kind of subway tunnel concrete spraying equipments, including stirring module (6), wet shot module (5) and control unit, it stirs module (6) and wet shot module (5) is integrally disposed, stirring module (6) is used to that the mixed material added according to default proportioning to be stirred to form concrete with water, wet shot module (5) includes concrete delivery pipe (3), the end of concrete delivery pipe (3) is equipped with nozzle, wet shot module (5) is used to the concrete after stirring being transported at nozzle (2) by concrete delivery pipe (3), with to being carried out wet shot by spray work surface (1).Such equipment takes up space smaller, is adaptable to narrow space in subway tunnel；Moreover, mixed material first can form concrete with water according to default proportioning stirring, then wet shot is carried out, concrete proportioning control can be made more accurate, and improve mixing uniformity, reduce concrete springback rate, dust concentration and labor strength.

Description

Subway tunnel concrete spraying equipment

Technical field

The utility model is related to constructing metro tunnel field of mechanical technique more particularly to a kind of subway tunnel concrete ejections Equipment.

Background technology

With the rapid expanding of urban population, traffic pressure is increasingly serious, builds subway as the effective of the contradiction is solved Means are building the big and medium-sized cities of subway more than 40 at present.Subway tunnel is built in construction, and gunite concrete operation is supporting An important step, decides construction quality and engineering safety in process.

At present mostly using moist spurting craft in subway work, main cause is that subway tunnel working space is narrow and small, mountain tunnel It is restricted with the wet spraying equipment of maturation application in vcehicular tunnel and the application of technique.The technological principle of half wet shotcreting technology It is：Cement, stone, sand and accelerator on ground are stirred in proportion, are delivered to working face, pressure is used after adding spraying machine Material is blown to by hose at nozzle by contracting air, and water is added at nozzle, forms material beam, high-speed pushing is on by spray working face.

But moist spurting craft construction can cause in hole that dust concentration is big, be the principal element for causing occupational disease, it is right in country Under the background that construction environment protection, personnel safety and health requirements are constantly strengthened, moist spurting craft cannot meet the need of environmental protection It asks.

In addition, find that damp spray technique also has the disadvantages that in practice of construction：Concrete springback rate is high, operator Member's manual regulating water flow ball valve at nozzle causes the ratio of mud that can not accurately control, and construction quality and construction efficiency are relatively low. Thus for the problems of existing concrete ejection technique, it is necessary to reference to subway tunnel actual conditions, study a set of suitable For the concrete spraying equipment and technique of constructing metro tunnel.

Utility model content

The purpose of this utility model is to propose a kind of subway tunnel concrete spraying equipment, can reduce in subway tunnel and apply The dust concentration at work scene.

To achieve the above object, the utility model provides a kind of subway tunnel concrete spraying equipment, including stirring mould Block, wet shot module and control unit, stir module and wet shot module is integrally disposed on same vehicle chassis, and stirring module is used It is stirred to form concrete with water in the mixed material to adding according to default proportioning, wet shot module includes concrete conveyance Pipe, the end of concrete delivery pipe are equipped with nozzle, and wet shot module is used to transport the concrete after stirring by concrete delivery pipe It send to nozzle, with to being carried out wet shot by spray work surface.

Further, spraying equipment further includes feeding module, for receiving the mixed material of external offer, and by mixture Material is added in into stirring module, and feeding module, stirring module and wet shot module are wholely set.

Further, feeding module includes the first hopper and the track being obliquely installed, and track is used for the first bunker lift To the surface of stirring module, control unit can control the first hopper to receive mixed material in rail base, and along Mixed material is discharged into stirring module during track motion to top of the rail.

Further, graduated scale is equipped in the first hopper, for passing through the metered mixed material of Plethysmometry.

Further, spraying equipment further includes at least two electric transporting vehicles, for will be alternately delivered to from ground Mixed material in subway tunnel is transported into feeding module.

Further, stirring module includes forced action type single horizontal shaft mixer.

Further, wet shot module includes the second hopper, and the second hopper is located at the obliquely downward of stirring module, logical for receiving Cross the concrete after stirring module stirring.

Further, wet shot module include accelerator supply part, accelerator supply part include peristaltic pump, on-off valve and Accelerator delivery pipe, one end of accelerator delivery pipe are connected with nozzle, and control unit can be opened when concrete is reached at nozzle Dynamic peristaltic pump mixes so that accelerator is reached by accelerator delivery pipe at nozzle with concrete.

Further, spraying equipment further includes waste disposal module, and waste disposal module includes auxiliary device, wet shot module Including pump, for by concrete pumping into concrete delivery pipe, control unit can after the wet shot end of job reverse starting Pump controls auxiliary device to provide compressed gas and water to draw back the concrete in concrete delivery pipe, with to concrete conveyance The inner wall of pipe is cleaned.

Further, spraying equipment further includes the operation rack being located at by front of spray work surface, and nozzle is fixed on operation machine On frame, spraying operation is performed for passing through operation operation rack.

Based on above-mentioned technical proposal, the subway tunnel concrete spraying equipment of the utility model embodiment will stir module It is integrally disposed on same vehicle chassis, reducing the overall space that equipment occupies with wet shot module, it can adapt in subway tunnel More narrow space in road；It is formed moreover, mixed material can be stirred with water according to default proportioning in stirring module in advance Concrete may be such that concrete proportioning control is more accurate, and improve mixing uniformity, reduce concrete springback rate；In addition, pass through Wet shot module can reduce the dust concentration of construction site, and reduce the labor intensity of worker to being carried out wet shot by spray work surface.

Description of the drawings

Attached drawing described herein is used to provide a further understanding of the present invention, and forms the part of the application, The schematic description and description of the utility model is not formed for explaining the utility model to the improper of the utility model It limits.In the accompanying drawings：

Fig. 1 is the structure diagram of one embodiment of the utility model subway tunnel concrete spraying equipment；

Fig. 2 is the process flow diagram that wet shot is carried out using the utility model subway tunnel concrete spraying equipment.

Reference sign

1st, by spray work surface；2nd, nozzle；3rd, concrete delivery pipe；4th, accelerator delivery pipe；5th, wet shot module；6th, mould is stirred Block；7th, the first hopper；8th, track；9th, electric transporting vehicle；10th, peristaltic pump；11st, vehicle chassis；12nd, the first recovery vehicle；13rd, compress Air shooter；14th, the second recovery vehicle；15th, the second hopper.

Specific embodiment

The utility model described further below.In the following paragraphs, the different aspect of embodiment is defined in more detail. The each side so limited can be combined with any other one side or many aspects, not can be combined unless explicitly stated otherwise.Especially It is, it is considered to be preferred or favourable any feature can be considered as preferred or favourable spy with other one or more Sign combination.

The terms descriptions merely for convenience such as " first " that occurs in the utility model, " second ", with distinguish have it is identical The different building blocks of title are not offered as priority or primary-slave relation.

In the description of the utility model, it is to be understood that term " interior ", " outer ", " on ", " under ", " left side " and " right side " It is based on orientation shown in the drawings or position relationship to wait the orientation of instructions or position relationship." longitudinal direction " refers to the length side of vehicle To " transverse direction " refers to the width of vehicle.These terms are for only for ease of description the utility model rather than instruction or dark Show that signified device there must be specific orientation, with specific azimuth configuration and operation, therefore it is not intended that this practicality The limitation of novel protected scope.

As shown in Figure 1, the utility model provides a kind of subway tunnel concrete spraying equipment, (follow-up referred to as injection is set It is standby), in a schematical embodiment, spraying equipment includes stirring module 6, wet shot module 5 and control unit, stirs module 6 and wet shot module 5 it is integrally disposed on same vehicle chassis 11.Wherein, module 6 is stirred to be used for adding according to default proportioning Mixed material and water be stirred to form concrete, mixed material is pre-configured moist mixed material, Huo Chengchao Tide is expected to add in stirring module 6 and then add in water to be stirred by material, and water can be gradually added into during stirring.Wet shot Module 5 includes concrete delivery pipe 3, and the end of concrete delivery pipe 3 is equipped with nozzle 2, after wet shot module 5 will be for that will stir evenly Concrete be transported to by concrete delivery pipe 3 at nozzle 2 and form high binder beam, in front of equipment by spray work surface 1 Carry out wet shot.

The spraying equipment of the utility model illustrative examples at least possesses one of following advantage：

(1) module 6 will be stirred and wet shot module 5 is integrally disposed on same vehicle chassis 11, equipment can be reduced Overall volume, to be adapted in subway tunnel more narrow space.

(2) operation is carried out by the way of wet shot, the dust concentration of construction site can be reduced, to ensure that operator's is strong Health；Nor operator's manual regulating water flow at nozzle is needed, labor intensity can be reduced, improves operating efficiency.

(3) mixed material with water can stir in stirring module and form concrete in advance, may be such that mixture in concrete The burden control of material and water is more accurate, avoids dynamic control proportioning, and can improve concrete by being sufficiently stirred in advance Uniformity reduces concrete springback rate, and improves concrete by the coating quality in spray work surface 1.

Further, the spraying equipment of the utility model further includes feeding module, and feeding module is used to receive external offer Mixed material, and by mixed material add in stirring module 6 in, control unit can control feeding module to be automatically performed feeding and move Make, to improve the degree of automation of feeding.

Feeding module, stirring module 6 and wet shot module 5 are integrally disposed on same vehicle chassis 11.This practicality is new The spraying equipment of type is the all-in-one machine for being integrated with feeding, stirring and wet shot function, and device structure can be made compact, and it is empty to occupy tunnel Between it is small, working space narrow and small in subway tunnel can be flexibly adapted to；And the equipment, using common bed, conveniently moving is fitted It is shared together in more work surfaces, reduces the restriction that equipment is subject in application, operating efficiency can be improved, reduce construction cost；In addition Dust can also be reduced to escape between modules, reduce the dust pollution in tunnel.

As shown in Figure 1, feeding module is located at the rear of stirring module 6 along longitudinal direction of car, wet shot module 5 is indulged along vehicle To the front for being located at stirring module 6.The modules in equipment are described in detail respectively below.

Feeding module includes the first hopper 7 and the track 8 being obliquely installed, and track 8 is used to the first hopper 7 being promoted to stirring The surface of module 6, control unit receive mixed material when the first hopper 7 can be controlled to move in 8 bottom of track, and Mixed material is discharged into stirring module 6 when moving to 8 top of track along track 8, is shown in Fig. 1 at the first hopper 7 View in the top and bottom of track 8.First hopper, 7 bottom is equipped with drain hole, when the first hopper 7 moves to track During 8 top, control unit opens drain hole, mixed material is discharged into stirring module 6, certain first hopper 7 also may be used By using discharging in a manner of toppling over.

In a kind of way of realization, the first hopper 7 can move itself under the control of control unit along track 8.Another In kind way of realization, track 8 is using movable transport mechanisms such as belts, the first hopper 7 to be driven to move.

Preferably, graduated scale is equipped in the first hopper 7, for passing through the metered mixed material of Plethysmometry. In the case where proportioning is certain, there is simple, reliable and accurate measurement using volumetric method metering.Receiving mixed material Before, the mixed material of specified quantitative is first poured into the first hopper 7 according to calculating and concrete amount is matched.Then start The switch of feeding module, charged first hopper 7 are promoted to the surface of stirring module 6,7 lower end of the first hopper along track 8 Drain hole automatically turn on, the drain hole of the first hopper 7 is engaged with the material receiving port of stirring module 6, and mixed material can unload automatically Enter to stir in module 6.

In order to provide mixed material to feeding module, the spraying equipment of the utility model further includes at least two electric transportations Vehicle 9, such as electro-tricycle, electric transporting vehicle 9 work in subway tunnel, for will alternately be delivered to subway from ground Mixed material in tunnel is transported into feeding module.Mixed material is conveyed using electric transporting vehicle 9, emission-free discharge can drop Low stain.

Before mixed material is conveyed by electric transporting vehicle 9, mixed tide material mixing is further included and from ground to tunnel The process of interior conveying mixed tide material.Wherein, mixed tide material mixing is using ground mixing plant, and water is carried out according to the proportioning of design The metering and stirring of mud, stone, sand and water.When starting wet shot operation, mixing plant mixing good mixed material in ground passes through Pipeline is delivered to through vertical shaft in tunnel.According to the length of transportation range, it is more than 1m by 2~3 delivered payload capabilities³Electric transporting vehicle 9 Alternating picks up mixed material, and feeding module position is transported to after splicing, and mixed material directly is poured into the first material In bucket 7.The material-uploading style of the utility model can reduce manpower throwing compared with by way of dismantling material bag to stirrer Enter, substantial amounts of material bag is avoided to be deposited in advance in tunnel, do not influence normally to excavate and operation of slagging tap.

Module 6 is stirred preferably by forced action type single horizontal shaft mixer, forced concrete mixer mixes the shaft in cylinder Equipped with agitating vane on arm support, the material mixed in cylinder is added in, under the strong agitation of agitating vane, forms the logistics of intersection.This Kind of agitating mode is strong more than agitating mode effect is fallen certainly, stirring evenly, it is more efficient.Alternately, stirring module 6 also may be used Using gravity type single horizontal shaft mixer.

Proportioning can be set in control unit in advance, realizes the automatic and accurate control of amount of water, mixing time.According to setting Time, whipping procedure automatically turns on, and stirring module 6 starts to be stirred material, while according to the time of setting, program according to Pre-set proportioning automatic start addition water, water-reducing agent, water can be continuously added during stirring in control unit, Uniform concrete is formed with stirring.After time according to setting completes stirring, control unit automatically controls mixer overturning, will Concrete pours into wet shot module 5 to carry out subsequent wet shot operation.

As shown in Figure 1, wet shot module 5 includes the second hopper 15, the second hopper 15 is located at the obliquely downward of stirring module 6, uses Pass through the concrete after stirring the stirring of module 6 in reception.After concrete, which stirs, to be completed, control unit automatically controls mixer Overturning, concrete is poured into the second hopper 15, and carries out subsequent wet shot operation by pumping wet spraying machine.In wet shot module 5 Equipped with pump, for concrete pumping into concrete delivery pipe 3, to be wanted with meeting by spray work surface 1 and the distance of spraying equipment It asks.

Further, wet shot module 5 further includes accelerator supply part, and accelerator supply part includes peristaltic pump 10, leads to Disconnected valve and accelerator delivery pipe 4, peristaltic pump 10 are located at the rear portion of vehicle chassis 11, and pressure-air solenoid valve can be used in on-off valve, One end of accelerator delivery pipe 4 is connected with nozzle 2.Automatic start hose when control unit can be at concrete arrival nozzle 2 Pump 10, while on-off valve is opened, it is mixed so that accelerator is reached by accelerator delivery pipe 4 at nozzle 2 with concrete, thus into Row wet shot operation.

Accelerator is generally mixed into advance before concrete ejection in the scheme of the prior art, is adding water whipping process and wet During spraying conveying, concrete has hardened to form intensity, easily causes plugging.And the spraying equipment of the utility model is spraying Accelerator with concrete is mixed at first 2, can prevent concrete from hardening, ensures the mobility of concrete, so as to It is injected in more glibly by spray work surface 1.Peristaltic pump have good suction capacity, can preferably generate vacuum come imbibition, It conveys the discharge capacity without vapour lock, every turn of realization to fix and unrelated with outlet pressure, accelerator can be measured exactly.

In wet shot operation, the mode for manually embracing spray on the one hand can be used, manipulator has nozzle 2 in arms, stands by spray operation Spraying operation is carried out before face 1.On the other hand also can operation rack be set by 1 front of spray work surface, nozzle 2 is fixed on operation machine On frame, for operator to be made to carry out spraying operation by operating the handle of the operation rack, the labor of manipulator can be so reduced Fatigue resistance improves operating efficiency.

The spraying equipment of the utility model can be automatically performed feeding, Jia Shui, addition diminishing under the control of control unit Agent, stirring, batch turning are extremely made concrete conveyance to the second hopper, using pumping wet spraying machine by concrete delivery pipe 3 by spray Industry face 1 carries out a series of actions such as spray operation.Such spraying equipment can save artificial unpacking discharging using automatic charging Process is substantially reduced for large area wet shot operation labor intensity；First hopper 7 and stirring module 6 press the time of program setting The preparation and supply of concrete are completed in interval, ensure not fracture in wet-spraying machine hopper, so as to fulfill continuous quick wet shot operation, The discontinuous phenomenon of injection brought using artificial unpacking discharging is avoided, the wet shot quality by spray work surface and construction can be improved Efficiency.

After wet shot operation is completed, it is also necessary to spraying equipment and pipeline are cleaned, waste material and waste water are handled, To achieve the purpose that environmental protection, for this purpose, the cleaning mating with spraying equipment and retracting device has also been devised in the utility model, to reduce The discharge of waste material and waste water reduces pollution.It is described below.

The equipment of the utility model further includes waste disposal module, and waste disposal module includes auxiliary device, auxiliary device For providing compressed air and water, control unit can be controlled after the wet shot end of job pump rotate backward to draw back concrete it is defeated Send the residual concrete in pipe 3, then control auxiliary device provide compressed gas and water with the inner wall to concrete delivery pipe 3 into Row cleaning.Waste water after cleaning is directly discharged into stirring module 6, and stirring module 6 starts stirring, is realized automatic cleaning, then is overturn Stirring module 6 is poured into waste water is cleaned in the second hopper 15 of wet-spraying machine, has been cleaned after the second hopper 15, opens the second hopper The drain hole of 15 bottoms discharges waste water and waste material.

Further, waste disposal module further includes the first recovery vehicle 12 and the second recovery vehicle 14, and the first recovery vehicle 12 is used In picking up waste water and waste material under the second hopper 15, and pour into the second recovery vehicle 14 and store, after precipitation, above clear liquid use It constructs next time, precipitation waste residue is more than the first recovery vehicle 12 for inverted arch or other constructions, the amount of storage of the second recovery vehicle 14.

The process that wet shot is carried out using the utility model spraying equipment is described in detail below.Stream as shown in Figure 2 Journey schematic diagram, including：

Concrete preparation process：Control unit control stirring module 6 is to the mixed material and water according to default proportioning addition It is stirred to form concrete；

Wet shot job step：Control unit control wet shot module 5 transports the concrete after stirring by concrete delivery pipe 3 It send to nozzle 2, with to being carried out wet shot by spray work surface 1.

Specifically, in wet shot job step, the method that wet shot is carried out by spray work surface is included：It manually embraces spray or uses Operate stent injection.

Such wet spraying process method can stir mixed material and water according to default proportioning in stirring module in advance Concrete is formed, may be such that concrete proportioning control is more accurate, and improves mixing uniformity, reduces concrete springback rate；In addition, Wet shot can also reduce the dust concentration of construction site, and reduce the labor intensity of worker.

Further, before concrete preparation process, which further includes feeding step, and feeding step is specifically wrapped It includes：

Mixed material is weighed by Plethysmometry using graduated scale in the first hopper 7；

Then control unit controls the first hopper 7 to be moved to along track 8 directly over stirring module 6；

Then control unit opens the drain hole of 7 lower end of the first hopper, so that mixed material is fallen into stirring module 6.

Automatic charging is realized by control unit in the process, can continuously be provided in concrete forming process Mixed material, improves the efficiency of feeding, and reduces human input.

Before feeding step, which further includes mixed material mixing step, specifically includes：It is stirred using concrete It mixes station mixing and forms moist mixed material, the meter of cement, stone, sand and water can be carried out according to the proportioning of design in mixing Amount and stirring.

In a specific embodiment, when carrying out mixed material mixing, the material of selection includes cement, stone, sand Son and water.Wherein, cement is common 425 cement, 5~10mm of cobble-stone diameter, and sand grain size is less than the building sand of 5mm, and water is Unpolluted tap water；According to stone additive amount is cement weight, 100%~180%, sand additive amount is cement weight 150%~220%, water additive amount be cement weight 5%~10% proportion relation, mixed using concrete mixing plant Close the mixing of tide material.

Further, after mixed material mixing step, which further includes：Mixing is formed to moist mixing Material is delivered to through vertical shaft in subway tunnel by pipeline.

Further, after mixed material mixing step is delivered in subway tunnel, which further includes：It adopts Alternately the mixed material being delivered in subway tunnel is transported into feeding module at least two electric transporting vehicles 9.

After concrete preparation process, which further includes：Control unit control stirring module 6 is overturn, will Concrete after stirring is poured into automatically in the second hopper 15 of wet shot module 5.

While the concrete after stirring is transported to by concrete delivery pipe 3 at nozzle 2 by wet shot module 5, the work Process further includes：Control unit starts peristaltic pump 10, so that accelerator is reached at nozzle 2 by accelerator delivery pipe 4 with mixing Solidifying soil mixing.

Further, after wet shot job step is completed, which further includes equipment cleaning and waste disposal step Suddenly, specifically include：

Control unit reverse starting pumps to draw back the concrete in concrete delivery pipe 3；

Control unit makes auxiliary device offer compressed gas and water be cleaned with the inner wall to concrete delivery pipe 3；

Waste water is discharged into stirring module 6, and starts stirring module 6, to be cleaned to the inside for stirring module 6；

Overturning stirring module 6 pours into waste water in wet shot module 5, to be cleaned to the second hopper 15；

The drain hole of 15 bottom of the second hopper is opened, the second recycling is poured into after picking up waste water and waste material by the first recovery vehicle 12 It is precipitated in vehicle 14.

A kind of subway tunnel concrete spraying equipment provided by the utility model is described in detail above.Herein In apply specific embodiment the principle and embodiment of the utility model be set forth, the explanation of above example is only It is the method and its core concept for being used to help understand the utility model.It should be pointed out that the ordinary skill for the art For personnel, on the premise of the utility model principle is not departed from, can also to the utility model, some improvement and modification can also be carried out, These improvement and modification are also fallen into the protection domain of the utility model claims.

Claims (10)

1. a kind of subway tunnel concrete spraying equipment, which is characterized in that including stirring module (6), wet shot module (5) and control Component, the stirring module (6) and wet shot module (5) are integrally disposed on same vehicle chassis (11), the stirring module (6) it is used to that the mixed material added according to default proportioning is stirred to form concrete with water, the wet shot module (5) includes Concrete delivery pipe (3), the end of the concrete delivery pipe (3) are equipped with nozzle (2), and the wet shot module (5) is used to stir Concrete after mixing is transported to by the concrete delivery pipe (3) at the nozzle (2), with to being carried out by spray work surface (1) Wet shot.

2. subway tunnel concrete spraying equipment according to claim 1, which is characterized in that further include feeding module, use It is added in the mixed material for receiving external offer, and by mixed material into the stirring module (6), the feeding module stirs It mixes module (6) and wet shot module (5) is integrally disposed on the same vehicle chassis (11).

3. subway tunnel concrete spraying equipment according to claim 2, which is characterized in that the feeding module includes the One hopper (7) and the track (8) being obliquely installed, the track (8) are used to first hopper (7) being promoted to the stirring mould The surface of block (6), the control unit can control first hopper (7) to receive mixing at the track (8) bottom Material, and mixed material is discharged into the stirring module when being moved to along the track (8) at the top of the track (8) (6) in.

4. subway tunnel concrete spraying equipment according to claim 3, which is characterized in that in first hopper (7) Equipped with graduated scale, for passing through the metered mixed material of Plethysmometry.

5. subway tunnel concrete spraying equipment according to claim 2, which is characterized in that further include at least two it is electronic Transport vehicle (9), for alternately transporting the mixed material being delivered to from ground in subway tunnel into the feeding module.

6. subway tunnel concrete spraying equipment according to claim 1, which is characterized in that the stirring module (6) is wrapped Include forced action type single horizontal shaft mixer.

7. subway tunnel concrete spraying equipment according to claim 1, which is characterized in that wet shot module (5) bag The second hopper (15) is included, second hopper (15) is located at the obliquely downward of the stirring module (6), is stirred for receiving by described Mix the concrete after module (6) stirring.

8. subway tunnel concrete spraying equipment according to claim 1, which is characterized in that wet shot module (5) bag Accelerator supply part is included, the accelerator supply part includes peristaltic pump (10), on-off valve and accelerator delivery pipe (4), institute The one end for stating accelerator delivery pipe (4) is connected with the nozzle (2), and the control unit can reach the nozzle in concrete (2) peristaltic pump (10) is started when at, so that accelerator is reached at nozzle (2) by the accelerator delivery pipe (4) with mixing Solidifying soil mixing.

9. subway tunnel concrete spraying equipment according to claim 1, which is characterized in that further include waste disposal mould Block, the waste disposal module include auxiliary device, and the wet shot module (5) includes pump, for by concrete pumping to described In concrete delivery pipe (3), the control unit can pump to draw back after the wet shot end of job described mixed described in reverse starting Concrete in solidifying soil delivery pipe (3), and the auxiliary device is controlled to provide compressed gas and water, with to the concrete conveyance The inner wall of pipe (3) is cleaned.

10. subway tunnel concrete spraying equipment according to claim 1, which is characterized in that further include be located at it is described by The operation rack in front of work surface (1) is sprayed, the nozzle (2) is fixed in the operation rack, and the behaviour is operated for passing through Make rack and perform spraying operation.