CN110965580A - Open-cut tunnel lining symmetrical and synchronous layered cloth pouring system and construction method - Google Patents

Abstract

The invention discloses a symmetrical and synchronous layered cloth pouring system for open cut tunnel lining, which comprises: the central material collecting groove is fixed at the center of the arch crown of the lining template and is provided with a plurality of independent discharge ports; a plurality of pouring string cylinders are arranged and fixed in the lining side wall at intervals; the storage bins are arranged in a plurality of layers; the aggregate funnels correspond to the pouring string barrels one by one, and the lower ports of the aggregate funnels are communicated with the upper ports of the pouring string barrels; the distribution chute sets up a plurality ofly and corresponds a plurality of discharge gates respectively the distribution chute lower extreme is located the upper shed department of aggregate funnel or be located the feed bin cloth chute mouth department of one deck. The invention also discloses a construction method for pouring the open cut tunnel lining by symmetrical and synchronous layered cloth. The invention has the advantages of high construction efficiency, simple operation, low labor intensity, capability of realizing semi-automatic pouring, no concrete drop on site, neat construction, environmental protection, no pollution and the like.

Description

Open-cut tunnel lining symmetrical and synchronous layered cloth pouring system and construction method

Technical Field

The invention relates to the technical field of open cut tunnel lining pouring. More specifically, the invention relates to a symmetrical and synchronous layered distribution pouring system and a construction method for an open cut tunnel lining.

Background

In shallow tunnels such as highways, railways, municipal administration and the like, the open cut method has the advantages of simple technology, economy, rapidness, easy control of construction quality and the like, so the open cut method is often used as a main selection method for shallow tunnel construction. The construction by the open cut method is safe and efficient, and the defects of secondary lining hollowing, insufficient thickness of the secondary lining and the like can be effectively avoided.

Although the open cut method has the advantages, the open cut tunnel is often subjected to unreasonable concrete distribution or single-point distribution in lining construction, and the lining pouring quality is always the main point of quality control of the open cut tunnel. The existing common lining pouring process has the defects that the lining concrete is easy to have the quality problems of herringbone slope, water leakage at the construction cold joint, insufficient strength, large strength discreteness at the same position and the like. Aiming at the problems, a reasonable and effective lining construction material distribution method needs to be designed, so that the lining concrete is symmetrically cast in layers, the common defects of the lining concrete casting are overcome, the concrete casting quality is ensured, and the casting efficacy is improved.

Disclosure of Invention

The invention aims to provide a symmetrical and synchronous layered distribution pouring system for an open-cut tunnel lining and a construction method thereof.

To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided an open trench tunnel lining symmetrical and synchronous layered cloth casting system, comprising:

the central material collecting groove is fixed at the center of the vault of the lining template and is provided with a pair of box groove bodies with openings on the upper surfaces, the box groove bodies are symmetrically arranged, the bottom plates of the box groove bodies are downwards inclined towards the lining side wall so that openings are formed between the side plates and the bottom plates, facing the lining side wall, the openings are provided with discharge doors, each discharge door is composed of a bottom beam and a plurality of baffle plates which are arranged on the bottom beam in parallel and vertically at intervals, and the discharge doors divide the openings into a plurality of independent discharge ports;

the pouring string cylinders are arranged in a plurality and fixed in the lining side walls at intervals, the pouring string cylinders are of a vertical hollow tubular structure and are symmetrically arranged in the lining side walls on two sides, and the upper ends of the pouring string cylinders slightly protrude out of the lining side walls;

the lining vault formwork is symmetrically provided with a plurality of material distribution notches which penetrate through the lining vault formwork and are arranged in a layered mode, and the material distribution notches and the inside of the lining vault form the material bin;

a plurality of collecting hoppers are arranged, the collecting hoppers correspond to the pouring string barrels one by one, and the lower ports of the collecting hoppers are communicated with the upper ports of the pouring string barrels;

the material distribution device comprises a material distribution chute, a plurality of discharge ports which are in one-to-one correspondence respectively, wherein the upper end of the material distribution chute is in seamless connection with the discharge ports, the lower end of the material distribution chute is positioned at the upper opening of the aggregate funnel or at the material distribution chute of the same layer of material bin, and the material distribution chute is formed by assembling a plurality of sections of chute units in a detachable mode.

Preferably, the central trough carries concrete by means of a pumping system.

Preferably, the inclination angle of the bottom plate of the central material collecting groove is not less than 45 degrees.

Preferably, the number of the discharge ports is 4-6.

Preferably, the baffle plates on two sides of the discharge port are provided with a pair of vertical groove channels which are formed by inwards sinking, and the pair of groove channels are internally provided with inserting plate valves in a matching way, and the inserting plate valves slide up and down along the pair of groove channels to open and close the discharge port and adjust the opening size of the discharge port.

Preferably, the pouring string barrel is also formed by assembling a plurality of sections of string barrel units.

Preferably, the sliding groove units are connected with a pair of counter bolts through a pair of buckling pieces, the buckling pieces are U-shaped, a pair of through holes are symmetrically formed in the bottom surfaces of the buckling pieces, a pair of threaded holes are oppositely formed in a pair of side surfaces of each sliding groove unit, a vertical through groove is further formed beside each threaded hole, when adjacent sliding groove units are tightly attached, a pair of side plates of each buckling piece just penetrate through the through grooves of the adjacent sliding groove units, the pair of through holes of each buckling piece just correspond to the two threaded holes of the adjacent sliding groove units one by one, and the pair of counter bolts respectively penetrate through the pair of threaded holes which are oppositely formed.

Preferably, all inwards cave in on the picture peg valve and be formed with the draw-in groove towards the tank body curb plate, still be provided with adjustment mechanism on the tank body curb plate, it includes:

a sliding block which is arranged to slide up and down along the side plate of the tank body all the time;

the clamping blocks extend into the sliding block and can freely and horizontally move in the sliding block, the end parts of the clamping blocks, which are positioned on the outer side of the sliding block, are matched and correspond to the clamping grooves right, and the end parts of the clamping blocks, which are positioned in the sliding block, are provided with downward-recessed abutting grooves;

the fixed rod is fixed in the sliding block and is horizontally arranged along the arrangement direction of the plurality of inserting plate valves;

the lower ends of the rotating pieces are upwards sunken to form gaps so as to divide the lower ends of the rotating pieces into a pair of abutting plates, the abutting plates are respectively positioned inside and outside the abutting grooves, and the rotating pieces are positioned on the fixing rods through the gaps;

the hinge bar, it is located the dead lever top and is parallel with the dead lever, hinge bar one end articulates in the sliding block, the upper end of rotating the piece is located the top of hinge bar all the time, the hinge bar is located the one side of rotating the piece and keeping away from the picture peg valve.

Preferably, the sliding block has a recessed platform recessed downward, and the other end of the hinge rod can be positioned right above the recessed platform and in a horizontal state.

The invention also provides a construction method for pouring open cut tunnel lining by symmetrical and synchronous layered cloth, which comprises the following steps:

s1, checking and accepting before pouring the lining of the formwork trolley and binding the second lining of steel bars;

s2, after the steel bars are bound, installing a template, and arranging a bin and a vibrating window;

s3, installing a cloth pouring system, namely installing a central collecting groove, installing a cloth sliding groove, and installing a collecting funnel and a pouring string barrel;

s4, conveying the concrete to a central collecting chute through a pumping system, opening a flashboard valve in the process, positioning the lower end of a distributing chute in a collecting hopper, and pouring side wall concrete;

s5, after the side wall concrete pouring is finished, adjusting the length of the distribution chute to enable the lower end of the distribution chute to sequentially enter the distribution notches of all layers from bottom to top to finish the vault concrete pouring, wherein when the vault concrete pouring is finished, the distribution notches are timely plugged by steel panels matched with the size of the storage bins after the pouring of one layer of storage bins is finished;

s6, when pouring, the vibrating window is matched to complete the pouring and vibrating work of the secondary lining concrete; and after the pouring is finished, removing the cloth pouring system in time to finish the lining concrete maintenance work.

The invention at least comprises the following beneficial effects:

1. the construction method can effectively improve the construction speed of concrete, avoid repeated transfer, insertion and preparation of the pump pipe, save the construction time, and save about 30 percent of the construction time compared with the traditional direct pouring.

2. The construction method is simple and convenient to operate, pouring points do not need to be frequently replaced, the material distribution is automatically distributed, the labor intensity of operation workers is reduced, the subsequent material distribution work can be automatically completed only by pumping the concrete to the central material collecting groove through the pumping system, and excessive manual operation is not needed.

3. The multi-point distribution is continuous, so that semi-automatic pouring of concrete is realized, continuous pouring is basically realized, multiple points on two sides of the same layer of concrete are distributed simultaneously, the pouring time of each tank of concrete is short, the slump loss is small, the pouring quality of the concrete is improved, and the open trench tunnel pouring construction environment is improved.

4. Through the distribution of the central material collecting groove, the control of the casting symmetry of the two sides of the lining is realized, the bilateral symmetry construction is ensured, the symmetrical, synchronous and continuous casting of concrete is effectively controlled, the construction cold joint caused by discontinuous construction is avoided, the concrete strength is uniform and reliable, the stress of the lining trolley is optimized, and the overlarge deviation of the overall dimension of the lining caused by the deformation or displacement of the trolley is avoided.

5. The automatic distribution multipoint synchronous material distribution system improves the level of mechanical construction equipment of the tunnel and promotes the progress of the open cut tunnel concrete pouring construction process.

6. The construction efficiency is high, easy operation, and intensity of labour reduces, can realize semi-automatization and pour, and on-the-spot no concrete drops, and the construction is clean and tidy, and the environmental protection is pollution-free.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

FIG. 1 is a schematic illustration of a casting system according to the present invention;

FIG. 2 is a schematic structural view of a central trough of the present invention;

FIG. 3 is a schematic illustration of side wall concrete placement in accordance with the present invention;

FIG. 4 is a schematic illustration of the present invention of vault concrete casting;

FIG. 5 is a schematic view of the structure of a discharge door and a gate valve according to the present invention;

FIG. 6 is a front view of the chute unit of the present invention;

FIG. 7 is a side view of the chute unit of the invention;

FIG. 8 is a front view of the adjustment mechanism of the present invention;

FIG. 9 is a side view of the first adjustment mechanism of the present invention;

FIG. 10 is a side view of the second adjustment mechanism of the present invention;

FIG. 11 is a general view of the quality of a lined concrete surface;

FIG. 12 is a partial state diagram of the surface quality of the lined concrete.

Description of reference numerals:

1. the material collecting device comprises a central material collecting groove 101, a box groove body 102, a bottom plate 103, side plates 104, a discharging door 105, a bottom beam 106, a baffle plate 107, a discharging port 108, a board inserting valve 2, a material distributing sliding groove 201, a sliding groove unit 202, a clamping piece 203, a split bolt 204, a through hole 205, a through groove 3, a storage bin 4, a lining trolley 5, a pumping system 6, a material collecting hopper 7, a pouring string barrel 801, a sliding block 802, a clamping block 803, a resisting groove 804, a fixing rod 805, a rotating piece 806, a resisting plate 807 and a hinge rod.

Detailed Description

The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.

It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

As shown in fig. 1 to 4, the present invention provides a symmetrical and synchronous layered cloth casting system for open cut tunnel lining, which comprises:

the lining formwork vault structure comprises a central material collecting groove 1, a lining formwork vault and a plurality of material discharging doors 104, wherein the central material collecting groove 1 is fixed at the center of the lining formwork vault, the central material collecting groove 1 is provided with a pair of box groove bodies 101 with openings on the upper surfaces, the box groove bodies 101 are symmetrically arranged, bottom plates 102 of the pair of box groove bodies 101 are inclined downwards towards a lining side wall, so that openings are formed between side plates 103 facing the lining side wall and the bottom plates 102, the openings are provided with the material discharging doors 104, each material discharging door 104 is composed of a bottom beam 105 and a plurality of baffle plates 106 which are arranged on the bottom beam 105 in parallel and vertically at;

the pouring string cylinders 7 are arranged in a plurality and fixed in the lining side walls at intervals, the pouring string cylinders 7 are of a vertical hollow tubular structure and are symmetrically arranged in the lining side walls on two sides, and the upper ends of the pouring string cylinders 7 slightly protrude out of the lining side walls;

a plurality of storage bins 3 are arranged, a plurality of material distribution notches which penetrate through the interior of the lining vault template are symmetrically arranged on the lining vault template and are arranged in a layered mode, and the material distribution notches and the interior of the lining vault form the storage bins 3;

a plurality of collecting hoppers 6 are arranged, the collecting hoppers 6 correspond to the pouring string cylinders 7 one by one, and the lower ports of the collecting hoppers 6 are communicated with the upper ports of the pouring string cylinders 7;

cloth spout 2, it sets up a plurality of and a plurality of discharge gates 107 of one-to-one respectively, cloth spout 2 upper end and discharge gate 107 seamless connection, 2 lower extremes of cloth spout are located the upper shed department of aggregate funnel 6 or the cloth spout department that is located one deck feed bin 3, cloth spout 2 can be dismantled by multisection spout unit 201 and assemble and form.

In the technical scheme, the pouring system is simple in structure, required equipment can be processed and manufactured on site, for example, the pouring system is formed by welding angle steel and steel plates, the pouring system has certain elasticity, namely bending property, so that the distribution chute 2 can be properly bent to meet the requirement of accurately conveying concrete to a specified position, the section of the distribution chute 2 is U-shaped, the upper end of the distribution chute 2 is in seamless connection with the two baffles 106 of the discharge port 107, and the concrete is enabled to enter the distribution chute 2 from the discharge port 107 without leakage. The central collecting chute 1 conveys concrete to a box chute body 101 of the central collecting chute 1 through a pumping system 5, a bottom plate 102 of the box chute body 101 is inclined downwards, the inclination angle is not smaller than 45 degrees, and the concrete can freely slide downwards under the action of gravity from each discharge port 107 to a storage bin 3 along a distribution chute 2 to realize pouring of vault concrete or slide to a pouring string barrel 7 through an aggregate funnel 6 to realize pouring of side wall concrete. The whole pouring system is symmetrically arranged along the vault, the structures are symmetrically distributed, synchronous pouring on two sides is symmetrically realized in the pouring process of the side wall concrete, and in the pouring process of the vault concrete, as the material bins 3 are arranged in layers and each layer is provided with a plurality of material bins 3 according to the lining area and the concrete pouring amount, the material bins 3 on two sides of the central material collecting groove 1 are completely symmetrically distributed, the synchronous layered pouring can be realized in the vault pouring. The system of the invention can avoid overlarge deviation of the external dimension of the lining caused by the deformation or displacement of the trolley, can also avoid construction cold joints caused by discontinuous construction, and simultaneously ensures the uniformity and reliability of the strength of the cast concrete. The cloth sliding groove 2 is formed by detachably assembling a plurality of sliding groove units 201, and the length of the cloth sliding groove 2 can be changed by increasing or decreasing the sliding groove units 201, so that the pouring of the whole lining concrete is completed through a cloth pouring system.

In another technical scheme, as shown in fig. 5, a pair of vertical groove channels formed by inward recess is arranged on the baffle 106 at two sides of the discharge port 107, an inserting plate valve 108 is arranged in the pair of groove channels in a matching manner, and slides up and down along the pair of groove channels to open and close the discharge port 107 and adjust the opening size of the discharge port 107, and the inserting plate valve 108 can be fixed below the inserting plate valve 108 of the groove channel through steel columns with different lengths and the like in the adjusting process.

In another technical scheme, the pouring string barrel 7 is formed by assembling a plurality of sections of string barrel units, so that the height of the pouring string barrel 7 is adjusted according to the height of the poured concrete, the pouring string barrel 7 is only used for pouring the side wall concrete, and therefore, according to the actual pouring condition, a plurality of sections of steel pipes and the like are assembled in a welding mode and the like on site.

In another technical scheme, as shown in fig. 6 and 7, the chute unit 201 is connected with a pair of counter bolts 203 through a pair of fasteners 202, the fasteners 202 are U-shaped, a pair of through holes 204 symmetrically arranged are formed in the bottom surface of each fastener, a pair of threaded holes oppositely arranged are formed in a pair of side surfaces of the chute unit 201, vertical through grooves 205 are further formed beside the threaded holes, when adjacent chute units 201 are tightly attached, a pair of side plates of the fasteners 202 just penetrate through the through grooves 205 of the adjacent chute units 201, the pair of through holes 204 of the fasteners 202 just correspond to the two threaded holes of the adjacent chute units 201 one by one, and the pair of counter bolts 203 penetrate through the pair of threaded holes oppositely arranged.

In the above technical solution, after the end portions of the adjacent sliding groove units 201 are aligned and tightly attached, the pair of fastening pieces 202 are respectively fastened into the through grooves 205 at both sides to realize the connection of the adjacent sliding groove units 201, and then the pair of split bolts 203 respectively penetrate through the through holes 204 and the threaded holes of the adjacent sliding groove units 201 to realize firm connection, when needing to be removed, only the pair of split bolts 203 and the fastening pieces 202 need to be removed.

In another technical solution, as shown in fig. 8 to 10, each of the inserting plate valves 108 is recessed inward to form a clamping groove facing a side plate of the tank body 101, and the clamping block 802 of the tank body 101 is further provided with an adjusting mechanism, which includes:

a slide block 801 provided to slide up and down along the side plate 103 of the tank body 101 at all times;

one of the fixture blocks 802 corresponds to the inserting plate valve 108 at the plurality of discharging openings, the fixture block 802 extends into the sliding block 801 and can freely and horizontally move in the sliding block 801, the end part of the fixture block 802, which is positioned at the outer side of the sliding block 801, is just matched and corresponds to the fixture groove, and the end part of the fixture block 802, which is positioned in the sliding block 801, is provided with a downward concave abutting groove 803;

a fixing rod 804 fixed in the sliding block 801 and horizontally arranged along the direction in which the plurality of gate valves 108 are arranged;

the rotating pieces 805 are arranged corresponding to the clamping blocks 802 one by one, the lower ends of the rotating pieces 805 are recessed upwards to form notches so as to divide the lower ends of the rotating pieces 805 into a pair of abutting plates 806, the abutting plates 806 are respectively positioned inside and outside the abutting grooves 803, and the rotating pieces 805 are positioned on the fixing rods 804 through the notches;

and the hinge rod 807 is positioned above the fixed rod 804 and is parallel to the fixed rod 804, one end of the hinge rod 807 is hinged in the sliding block 801, the upper end of the rotating member 805 is always positioned above the hinge rod 807, and the hinge rod 807 is positioned on the side of the rotating member 805 far away from the flashboard valve 108.

In the above technical solution, in one embodiment, the side plate 103 of the tank body 101 has a slide rail, and the slide block 801 is lifted by a lifting mechanism fixed on the side plate 103 of the tank body 101 to slide up and down on the side plate 103 of the tank body 101, and other existing manners may be adopted as long as the slide block 801 can move up and down stably. The sliding block 801 is provided with a plurality of groove bodies which are sunken downwards along the arrangement direction of the plurality of inserting plate valves 108, the sliding block is just accommodated with the rotating piece 805 inside and limited to rotate only along the direction vertical to the side plate 103 of the box groove body 101, the outer side surface of the sliding block 801 parallel to the side plate 103 is also provided with a plurality of groove bodies which are sunken inwards, the sliding block is just accommodated with a plurality of clamping blocks 802 which are correspondingly positioned inside and can only move along the direction vertical to the side plate 103 of the box groove body 101, and the sliding block 801 is communicated with the direction where the hinge rod 807 is arranged so as to ensure that the hinge rod 807 can rotate upwards freely. In an initial state, all the fixture blocks 802 are located at the innermost side of the sliding block 801 and are not in contact with the fixture grooves, the rotating member 805 is vertically downward, one pair of abutting plates 806 are located just inside and outside the abutting grooves 803, as shown in fig. 9, when the inserting plate valve 108 needs to be adjusted to be opened and closed or the opening size needs to be adjusted, the inserting plate valve 108 needs to be adjusted to move up and down, at this time, the sliding block 801 is moved up and down so that the fixture blocks 802 are just opposite to the fixture grooves, the hinge rod 807 is rotated to leave the position of the rotating member 805, the rotating member 805 is manually driven to rotate, so that the abutting plates 806 outside the abutting grooves 803 push the fixture blocks 802 to move outwards to be clamped into the fixture grooves, the hinge rod 807 is then placed down, the position of the rotating member 805 at this. In addition, in actual construction, each plate valve 108 does not need to be opened to the same extent, so that separate adjustment of plate valves 108 can be achieved by selectively rotating corresponding rotating member 805 and defining the position of rotation by means of hinge rod 807.

In another technical solution, the sliding block 801 has a concave platform recessed downward, and the other end of the hinge rod 807 can be located right above the concave platform and in a horizontal state.

The invention also provides a symmetrical and synchronous layered cloth pouring construction method for the open cut tunnel lining, which comprises the following steps:

s1, checking and accepting before pouring the lining of the formwork trolley and binding the second lining of steel bars;

s2, after the steel bars are bound, installing a template, and arranging a bin 3 and a vibrating window;

s3, installing a cloth pouring system, namely installing a central collecting groove 1, installing a cloth sliding groove 2, and finally installing a collecting funnel 6 and a pouring string barrel 7;

s4, conveying the concrete to a central collecting chute 1 through a pumping system 5, opening a flashboard valve 108 in the process, positioning the lower end of a distributing chute 2 in a collecting hopper 6, and pouring side wall concrete;

s5, after the side wall concrete pouring is finished, adjusting the length of the distribution chute 2 to enable the lower end of the distribution chute 2 to sequentially enter each layer of distribution notches from bottom to top, and finishing the vault concrete pouring, wherein when the vault concrete pouring is finished, each layer of stock bin 3 is poured, and the distribution notches are timely plugged by steel panels matched with the size of the stock bin 3;

s6, when pouring, the vibrating window is matched to complete the pouring and vibrating work of the secondary lining concrete; and after the pouring is finished, removing the cloth pouring system in time to finish the lining concrete maintenance work.

The detailed process of the construction method is as follows:

1) the inverted arch is constructed in advance, after the inverted arch is poured, the reinforcing steel bar trolley is moved to be pushed to the position where the inverted arch is finished, and the binding work of the reinforcing steel bars of the lining side wall is finished through the reinforcing steel bar trolley operating platform; after the binding of the second lining steel bars of the side wall is finished, the steel bar trolley is withdrawn, the lining trolley 4 is pushed in, the binding work of the second lining steel bars at the top is finished above the lining trolley 4, cushion blocks are reasonably arranged during binding, and the thickness of the steel bar protection layer is well controlled;

2) after the lining side wall and the top reinforcing steel bars are bound, correction inspection is carried out on the bound reinforcing steel bars, the top die and the end die are installed and fixed after the top die and the end die are qualified, and the stock bin 3 and the vibrating window are respectively arranged at the top and two sides of the template, so that the pouring and vibrating of secondary lining concrete in the later period are facilitated;

3) the symmetrical and synchronous layered distribution pouring system is installed on the installed template, a central material collecting groove 1 is installed at the vault of the lining template, a distribution chute 2 is installed, a material collecting funnel 6 and a pouring string barrel 7 are installed, and after the installation is finished, the distribution system is checked to ensure that all the parts are continuous, stable and firm, and the condition of instability interruption cannot occur in the concrete pouring process;

4) the concrete required by lining pouring is conveyed to a central collecting groove 1 of a distributing distribution system through a pumping system 5, the central collecting groove 1 is connected with a collecting hopper 6 and a pouring string cylinder 7 through a distributing chute 2, and the conveying amount of the concrete is adjusted between the central collecting groove 1 and the distributing chute 2 through a concrete inserting plate valve 108 so as to control the distributing speed of the concrete in each distributing chute 2; the distribution chute 2 can be formed by splicing 2m sections, the length of the distribution chute 2 can be flexibly adjusted according to the position of the storage bin 3, the distribution chute 2 and the collecting hopper 6 can be detachably communicated or directly overlapped, the rapid connection and the detachment are convenient, and trial assembly inspection is carried out after the manufacturing is finished;

5) the rear end of each distributing chute 2 is connected with an aggregate funnel 6, and concrete is conveyed to the aggregate funnel 6 through the distributing chutes 2 and enters a concrete pouring string barrel 7 or a stock bin 3 through the aggregate funnel 6; when the lining side wall is poured, a concrete pouring string barrel 7 is arranged below the aggregate funnel 6, concrete flows into each material distribution point of the lining trolley 4 through the pouring string barrel 7, the pouring string barrel 7 is formed by one section per 2m, the height of the pouring string barrel 7 can be adjusted according to the height of the poured concrete, the length of the pouring string barrel 7 is adjusted according to the concrete pouring condition of the side walls on two sides, the free falling height of the concrete is controlled, and the phenomenon that the concrete is separated in the falling process to influence the concrete quality is avoided;

6) after the pouring of the lining side wall is completed, the length of the distribution chute 2 is adjusted, so that the end part of the distribution chute 2 sequentially enters each layer of distribution notches from bottom to top, the concrete pouring of the top plate is completed, and when one layer of pouring is completed during the top plate pouring, the distribution notches are timely plugged by steel panels matched with the size of the bin 3;

7) the vibrating bin is matched with the concrete pouring and vibrating bin to complete the pouring and vibrating work of the secondary lining concrete, the concrete is pumped into the central collecting groove 1, the distribution system is used for distributing the concrete, and the inserting plate valve 108 is used for controlling the opening and closing of the discharge port 107, so that the aim of symmetrically pouring the concrete in layers at two sides is fulfilled. The plug-in vibrator needs to be fast plugged and slowly pulled, so that the tamping bar cannot be dragged in the concrete pouring bin flatly, the contact with a template, a waterproof plate, a reinforcing steel bar and embedded parts is avoided, and the vibrating can be finished when the surface of concrete is full of slurry, does not sink obviously and does not bubble. Starting the attached vibrator from bottom to top in sequence; vibrating for 8-10 s each time, preferably for 3-4 times;

8) in the pouring process of each layer of concrete, firstly adopting an inserted vibrator to vibrate, then starting an attached vibrator to vibrate, and mainly adopting the inserted vibrator to vibrate the reinforced concrete; after concrete pouring is finished, timely maintenance is carried out, geotextile is adopted to cover the opening of the anchor plate at the position of the cloth notch and then the position is blocked, and watering maintenance is carried out to ensure that the surface of concrete is wet; after the formwork and the trolley are disassembled, the concrete maintenance work after the formwork is disassembled is required.

Examples

The construction method is applied to the construction of No. 2 open-cut tunnel of Beijing male intercity railway airport, effectively avoids the quality defect of conventional tunnel lining concrete construction, and improves the construction quality of lining. Compared with the traditional concrete process, the lining of each plate can save about 2h, and 2 workers are saved.

The tunnel No. 2 of the Beijing male intercity railway airport is connected with a Beijing new airport underground station in north, the south-crossing permanently fixed Henan embankment exposes out of the ground, the origin-destination mileage is DK44+ 911.349-DK 53+300, and the total length is 8338.651 m. The DK46+ 092-DK 48+000 sections in the section range of the standard are the unadjusted parts of the lines, the length is 1908m, the DK48+ 000-DK 53+300 sections are the adjusted parts of the lines, and the total length is 7208 m.

The area where the line belongs is located at the north edge of the North China plain, takes yellow villages as a boundary, the north part is a forward flood plain, the south part is a flood plain, the terrain is flat and wide, the ground elevation is 48-7 m, the terrain slowly inclines from the northwest to the southeast, most of cultivated lands in the planned engineering field and on the two sides of the line are divided, and local sections penetrate through villages.

The surface water along the line is mainly river water and canal water, and the water is accumulated in a pit and a pond in a local area. The river along the way belongs to the sea and river system, and the main rivers comprise a paradise river and the like. The river bed of the river in the region is wide, the bank slope is protected, the river flow speed is slow, and the landforms of the two banks are flat. Rivers are influenced by manual regulation, the river flow is basically stable, and the river flow is slightly increased in rainy seasons.

The line passes through two rivers, namely a Tiantang river and a Yongding river, and the line respectively passes through a Guangyang area of a corridor city of Hebei province, a Daxing area of a Beijing city and a Guan county of the corridor city, wherein the No. 2 tunnel of the airport in the range of the marking section is located in the Daxing area of the Beijing city at 4375m, the Guangyang area of the corridor city at 1413m and the Guan county at 1420m, and the maximum buried depth of the tunnel is 28.64 m. The tunnel is designed to be a single-hole double-line tunnel, the line spacing is 5m, and the portal is a column portal.

The tunnel No. 2 of the airport mainly adopts slope-releasing open cut construction, and adopts the forms of soil nailing wall slope releasing, bored concrete pile + steel support enclosure, slope releasing + double-row bored concrete pile enclosure.

The open cut tunnel construction adopts the construction of a lining trolley, firstly, inverted arch construction is carried out, and after filling and construction of inverted arches are finished, waterproof boards and binding reinforcing steel bars are manually laid by utilizing a multifunctional operation rack. The arch lining adopts a hydraulic integral lining trolley to carry out one-step integral pouring construction of the arch lining, the length of the trolley is 9.1m, and the trolley is manufactured by professional processing units. The concrete is intensively mixed by a mixing station, and the concrete is transported to the site by a concrete transport vehicle and pumped into a mould by a delivery pump.

A multipoint synchronous symmetrical concrete distribution construction method is adopted during open-cut tunnel construction of the Jingxiong railway. By the construction method, the lining concrete is continuously poured, and the defects of cold joint, insufficient joint strength and the like caused by uneven cloth are avoided. The surface of the concrete is uniform and continuous in color, flat and uniform in surface and good in apparent quality, and the quality effect of the concrete after pouring is shown in fig. 11 and 12.

While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.

Claims (10)

1. The utility model provides an open cut tunnel lining symmetry layering cloth pouring system in step, its characterized in that includes:

the central material collecting groove is fixed at the center of the vault of the lining template and is provided with a pair of box groove bodies with openings on the upper surfaces, the box groove bodies are symmetrically arranged, the bottom plates of the box groove bodies are downwards inclined towards the lining side wall so that openings are formed between the side plates and the bottom plates, facing the lining side wall, the openings are provided with discharge doors, each discharge door is composed of a bottom beam and a plurality of baffle plates which are arranged on the bottom beam in parallel and vertically at intervals, and the discharge doors divide the openings into a plurality of independent discharge ports;

the pouring string cylinders are arranged in a plurality and fixed in the lining side walls at intervals, the pouring string cylinders are of a vertical hollow tubular structure and are symmetrically arranged in the lining side walls on two sides, and the upper ends of the pouring string cylinders slightly protrude out of the lining side walls;

the lining vault formwork is symmetrically provided with a plurality of material distribution notches which penetrate through the lining vault formwork and are arranged in a layered mode, and the material distribution notches and the inside of the lining vault form the material bin;

a plurality of collecting hoppers are arranged, the collecting hoppers correspond to the pouring string barrels one by one, and the lower ports of the collecting hoppers are communicated with the upper ports of the pouring string barrels;

the material distribution device comprises a material distribution chute, a plurality of discharge ports which are in one-to-one correspondence respectively, wherein the upper end of the material distribution chute is in seamless connection with the discharge ports, the lower end of the material distribution chute is positioned at the upper opening of the aggregate funnel or at the material distribution chute of the same layer of material bin, and the material distribution chute is formed by assembling a plurality of sections of chute units in a detachable mode.

2. The open-cut tunnel lining symmetrical and synchronous layered cloth casting system of claim 1, wherein the central trough carries concrete by a pumping system.

3. The open-cut tunnel lining symmetrical and synchronous layered cloth casting system of claim 1, wherein the inclination angle of the bottom plate of the central trough is not less than 45 °.

4. The open-cut tunnel lining symmetrical and synchronous layered cloth pouring system according to claim 1, wherein the number of the discharge ports is 4-6.

5. The open-cut tunnel lining symmetrical and synchronous layered cloth pouring system according to claim 1, wherein the baffles on both sides of the discharge port are provided with a pair of vertical groove channels formed by inward recess, and a flashboard valve is arranged in the pair of groove channels in a matched manner and slides up and down along the pair of groove channels to open and close the discharge port and adjust the opening size of the discharge port.

6. The open-cut tunnel lining symmetrical and synchronous layered cloth casting system of claim 1, wherein the casting string barrel is also assembled by a plurality of string barrel units.

7. The open-cut tunnel lining symmetrical and synchronous layered cloth pouring system according to claim 1, wherein the chute units are connected by a pair of fasteners and a pair of counter bolts, the fasteners are U-shaped, a pair of through holes are symmetrically arranged on the bottom surfaces of the fasteners, a pair of threaded holes are oppositely arranged on a pair of side surfaces of the chute units, vertical through grooves are further arranged beside the threaded holes, when adjacent chute units are tightly attached, a pair of side plates of the fasteners just penetrate through the through grooves of the adjacent chute units respectively, a pair of through holes of the fasteners just correspond to two threaded holes of the adjacent chute units one by one, and a pair of counter bolts penetrate through the pair of threaded holes oppositely arranged respectively.

8. The open-cut tunnel lining symmetrical and synchronous layered cloth pouring system according to claim 5, wherein the inserting plate valves are all inwards recessed to form clamping grooves facing a box body side plate, and the box body side plate is further provided with an adjusting mechanism which comprises:

a sliding block which is arranged to slide up and down along the side plate of the tank body all the time;

the clamping blocks extend into the sliding block and can freely and horizontally move in the sliding block, the end parts of the clamping blocks, which are positioned on the outer side of the sliding block, are matched and correspond to the clamping grooves right, and the end parts of the clamping blocks, which are positioned in the sliding block, are provided with downward-recessed abutting grooves;

the fixed rod is fixed in the sliding block and is horizontally arranged along the arrangement direction of the plurality of inserting plate valves;

the lower ends of the rotating pieces are upwards sunken to form gaps so as to divide the lower ends of the rotating pieces into a pair of abutting plates, the abutting plates are respectively positioned inside and outside the abutting grooves, and the rotating pieces are positioned on the fixing rods through the gaps;

the hinge bar, it is located the dead lever top and is parallel with the dead lever, hinge bar one end articulates in the sliding block, the upper end of rotating the piece is located the top of hinge bar all the time, the hinge bar is located the one side of rotating the piece and keeping away from the picture peg valve.

9. The open-cut tunnel lining symmetrical and synchronous layered cloth casting system according to claim 8, wherein the sliding block is provided with a concave platform which is concave downwards, and the other end of the hinge rod can be just positioned on the concave platform and is in a horizontal state.

10. A symmetrical and synchronous layered cloth pouring construction method for open cut tunnel lining is characterized by comprising the following steps:

s1, checking and accepting before pouring the lining of the formwork trolley and binding the second lining of steel bars;

s2, after the steel bars are bound, installing a template, and arranging a bin and a vibrating window;

s3, installing a cloth pouring system, namely installing a central collecting groove, installing a cloth sliding groove, and installing a collecting funnel and a pouring string barrel;

s4, conveying the concrete to a central collecting chute through a pumping system, opening a flashboard valve in the process, positioning the lower end of a distributing chute in a collecting hopper, and pouring side wall concrete;

s5, after the side wall concrete pouring is finished, adjusting the length of the distribution chute to enable the lower end of the distribution chute to sequentially enter the distribution notches of all layers from bottom to top to finish the vault concrete pouring, wherein when the vault concrete pouring is finished, the distribution notches are timely plugged by steel panels matched with the size of the storage bins after the pouring of one layer of storage bins is finished;

s6, when pouring, the vibrating window is matched to complete the pouring and vibrating work of the secondary lining concrete; and after the pouring is finished, removing the cloth pouring system in time to finish the lining concrete maintenance work.

Images