CN103061778B - Tunnel arch foot circumferential high pressure jet strengthening method and construction equipment - Google Patents

Tunnel arch foot circumferential high pressure jet strengthening method and construction equipment Download PDF

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Publication number
CN103061778B
CN103061778B CN201310044700.6A CN201310044700A CN103061778B CN 103061778 B CN103061778 B CN 103061778B CN 201310044700 A CN201310044700 A CN 201310044700A CN 103061778 B CN103061778 B CN 103061778B
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pressure
drilling rod
tunnel
balladeur train
construction
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CN103061778A (en
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杨积凯
聂政熊
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BEIJING SHOUER ENGINEERING TECHNOLOGY Co Ltd
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BEIJING SHOUER ENGINEERING TECHNOLOGY Co Ltd
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Abstract

The invention relates to a tunnel arch foot circumferential high pressure jet strengthening method and a construction equipment. The construction equipment comprises a rack guide rail, a rack, an arc slideway, a movable sliding frame, a fixed sliding frame, a hydraulic oil cylinder, an arc drill rod, a high pressure pump station and a hydraulic pump station, wherein the feeding and retracement of the arc drill rod are controlled by the hydraulic oil cylinder; when the arc drill rod is fed, the hydraulic pump station jets high pressure water; when the arc drill rod is retraced, high pressure cement paste is jet through high pressure; and a left overlapping region, a left side circumferential strengthening bottom plate, a middle overlapping region, a right side circumferential strengthening bottom plate and a right overlapping region form a closed strengthening circle at the bottom part of a tunnel, thus effectively solving the strengthening problems of a tunnel arch foot and an inverted arch part under the condition of weak surrounding rocks and particularly saturated silt-fine stones.

Description

Tunnel arch springing hoop high-pressure injection reinforcement means and construction equipment
Technical field
The present invention relates to leading reinforcement means and equipment, particularly a kind of leading reinforcement means and equipment thereof of guaranteeing arch springing position safety in a kind of constructing tunnel.
Background technology
Modelling of Tunnel Excavation in Soft Rock or a difficult problem, particularly, in this stratum of similar saturated powder packsand, due to its hypotonicity and weak cementing properties, adopt common grouting method difficulty to produce effect at present, and when excavation, stratum is because being subject to disturbance to occur Sand unstability.Be to adopt horizontal jet grouting technique to this kind of effective leading reinforcement means of stratum one, before tunnel excavation, outside excavation contour line, construction one encircles or encircles more horizontal jet grouting stake formation arching and plays water proof antiseepage effect.But this leading reinforcement means is because restriction and the common horizontal jet grouting of cost reason of plant equipment can only be constructed in position, arch, and the horizontal jet grouting stake of arch springing is the weak spot of this kind of reinforcement means with the joint portion of country rock like this.If not can solve the leading reinforcing problem at arch springing position, will greatly affect tunnel integral construction progress.Common way is to increase a lot of stakes at arch springing position with reply arch springing shakiness, but because horizontal jet grouting does not form sealing, get out of a predicament or an embarrassing situation or inverted arch position has water outlet mud extraction or stratum to slip to collapse, cause topping bar and middle bench excavation after get out of a predicament or an embarrassing situation and inverted arch position practice of construction extremely difficult.
For can be in Support System in Soft Rock Tunnels better application level churning technique, remove the protection dead angle of horizontal jet grouting technique, for Modelling of Tunnel Excavation in Soft Rock provides better safety guarantee, must find a kind of method and construction equipment, can strengthen horizontal jet grouting stake with country rock the stability in arch springing joint portion, can form again a closed curtain, play the effect of the solid sand of gear soil that blocks water.
Summary of the invention
The object of this invention is to provide a kind of tunnel arch springing hoop high-pressure injection reinforcement means and construction equipment, solve in the time that Modelling of Tunnel Excavation in Soft Rock adopts hoop horizontal jet grouting stake advance support, can strengthen horizontal jet grouting stake with country rock the stability in arch springing joint portion, can form again a closed curtain, play the technical problem of the solid sand effect of gear soil that blocks water.
For achieving the above object, the present invention adopts following technical scheme:
A kind of tunnel arch springing hoop high-pressure injection reinforcement means, step is as follows:
Step 1, taking topping bar of having excavated or middle step as construction step surface, with Tapper, at construction step surface bilateral symmetry tunnel axis, that outputs two row's arc drilling rods by designing requirement enters hole, ground;
Step 2, rack rail is fixed on to the left side of construction step surface by installation dimension, to be fixed on rack rail with the frame of fixing balladeur train and mobile balladeur train, complete the connection of first arc drilling rod, shower nozzle and high-pressure water pipe, water under high pressure mud pipe simultaneously, then open the opening-closing type guide and limit circle on clamper and the cambered way on mobile balladeur train top, first arc drilling rod gripped;
Step 3, starts high pressure pumping plant, beats water under high pressure by high-pressure water pipe to the front nozzle of shower nozzle, and below, hole, the ground soil body that enters of arc drilling rod is carried out to jet cutting, and loose soil layer, creates conditions for arc drilling rod buries; Hydraulic power unit, to hydraulic jack fuel feeding, promotes mobile balladeur train and clamper arc drilling rod is buried along arching trajectory simultaneously;
Step 4, hydraulic jack reaches after stroke end of a period, unclamps clamper, and hydraulic jack shrinks, and drives mobile balladeur train and clamper to withdraw original position, and first arc drilling rod of order clamping realized and being sent to;
Step 5, complete several times send to the work of arc drilling rod spreading after, when the drill bit of arc drilling rod arrives middle the overlap of design, high pressure pumping plant stops beating water under high pressure to front nozzle, front nozzle finishes to cut;
Step 6, high pressure pumping plant starts to beat water under high pressure mud by Guan Xiangsi side nozzle of two water under high pressure mud, arc drilling rod under the acting in conjunction of hydraulic jack, clamper and mobile balladeur train by high-pressure injection technical requirements at a slow speed order withdraw, side nozzle is implemented directed high-pressure injection to tunnel axis front and back, until left side overlap, the overlap joint of realization and left side horizontal jet grouting stake, completes the construction of left side hoop reinforcing soleplate;
Step 7, arc drilling rod withdraws high-pressure injection complete after, close high pressure pumping plant, withdraw arc drilling rod to construction step surface, construction equipment move to along rack rail to tunnel bearing of trend the next one enter ground hole;
Step 8, after construction equipment is fixed, repeating step three is to step 7 until complete all stations constructions in tunnel axis left side;
Step 9, at the same mounting and construction equipment in tunnel axis right side, repeating step eight is realized sending to of arc drilling rod and is withdrawn high-pressure injection, complete the construction of right side hoop reinforcing soleplate, right side hoop reinforcing soleplate and left side hoop reinforcing soleplate are realized overlap joint at middle overlap, realize overlap joint with right side horizontal jet grouting stake at right side overlap, so far the curtain being made up of left side hoop reinforcing soleplate and right side hoop reinforcing soleplate that forms series of parallel at tunnel bottom, this curtain and horizontal jet grouting advance support form closed reinforcement circle.
Described step 2, in the time of the mounting and construction equipment of tunnel axis left side, at tunnel axis right side while mounting and construction equipment, after first station in tunnel axis left side has been constructed, start to realize arc drilling rod at first station on tunnel axis right side according to step 3 to step 7 and send and withdraw high-pressure injection to, complete the construction of right side hoop reinforcing soleplate, form a curtain being formed by left side hoop reinforcing soleplate and right side hoop reinforcing soleplate at tunnel bottom, then constantly alternately construction of left and right, finally form series of parallel by left side hoop reinforcing soleplate, the closed reinforcement circle of right side hoop reinforcing soleplate and horizontal jet grouting advance support composition, overlap in the middle of the formation respectively that described left side hoop reinforcing soleplate and right side hoop reinforcing soleplate overlap mutually, the left side of the formation respectively overlap that described left side hoop reinforcing soleplate and horizontal jet grouting advance support overlap mutually, the right side of the formation respectively overlap that described right side hoop reinforcing soleplate and horizontal jet grouting advance support overlap mutually.
The end face of described left side overlap and right side overlap is all positioned at the construction lower 1.5 meters of depths of step surface.
In described step 3, the pressure of described water under high pressure is 25~30MPa.
In described step 6, the pressure of described water under high pressure mud is 35~40MPa.
The construction equipment adopting in described tunnel arch springing hoop high-pressure injection reinforcement means, comprise rack rail, frame, cambered way, mobile balladeur train, fixing balladeur train, hydraulic jack, arc drilling rod, high pressure pumping plant and hydraulic power unit, described rack rail is parallel to tunnel axis direction and is arranged near on the construction step surface of arch springing by installation dimension requirement, described frame is erected on rack rail, described frame end face has set up cambered way, described cambered way end face is connected with opening-closing type guide and limit circle, the spaced apart locating hole that is provided with on its facade, described mobile balladeur train and fixing balladeur train are inserted in cambered way, wherein, the top of described mobile balladeur train is connected with clamper, described fixing balladeur train inserts locating hole by bearing pin and cambered way is fixed, described mobile balladeur train is flexibly connected with cambered way, between fixing balladeur train and mobile balladeur train, connect by hydraulic jack, described hydraulic jack is circumscribed with hydraulic power unit,
The axis parallel of described arc drilling rod and cambered way, its clamping by clamper and mobile balladeur train are fixed, and by opening-closing type guide and limit circle, it are carried out to guide and limit; Described arc drilling rod interpolation has a high-pressure water pipe and two water under high pressure mud pipes, front nozzle on the shower nozzle of the head of described high-pressure water pipe and arc drilling rod front end is communicated with, the head of described water under high pressure mud pipe is communicated with the side nozzle on the shower nozzle of arc drilling rod front end, and the afterbody of described high-pressure water pipe and two water under high pressure mud pipes is all connected with high pressure pumping plant.
Described cambered way is made up after by design size stretch bending of H shaped steel.
Described side nozzle respectively arranges two every 180 ° on shower nozzle, and when construction, injection direction is parallel to tunnel axis direction.
In the sidewall notches of described shower nozzle, be fixed with wireless position sensor, described wireless position sensor sends to position indicator by wireless launcher by position signalling.
Compared with prior art the present invention has following characteristics and beneficial effect: first, adopting tunnel arch springing hoop to spray reinforces, the operation platform that what the utilization of this construction method was excavated out top bar or middle step forms, avoid adopting in traditional construction the reinforcement means of horizontal jet grouting stake in the difficult point of getting out of a predicament or an embarrassing situation and implement inverted arch position, adopt this reinforcement means simultaneously, can form left overlap at tunnel bottom, the closed reinforcement circle of middle overlap and right overlap composition, also can announce the cylindric closed prop of the common formation of horizontal jet grouting curtain of having constructed with tunnel simultaneously, effectively solve particularly saturated powder packsand situation of weak surrounding rock, the reinforcing problem at lower tunnel arch springing and inverted arch position.
Secondly, this construction method is compared and is fixed the sand in curtain effect realizing the good water proof of tunnel bottom with the horizontal jet grouting method of tunnel bottom, due to reinforce curtain thickness than high-pressure injection reinforce little, can effectively reduce reinforcing expense and shorten the construction period, improve efficiency of construction.
Moreover, for realizing this construction method, the present invention proposes a whole set of construction equipment, by adopting arc drilling rod and itself and mobile balladeur train being fixed, realizing arc drilling rod sends to flexibly and withdraws, at arc drill boom end, front nozzle and the side nozzle that function is different is set, in work progress, without changing drilling rod, improves efficiency of construction simultaneously.
In addition, the front end drill bit position setting angle sensor of arc drilling rod can further ensure construction precision, makes tunnel arch springing hoop spray reinforcement means and reliably overlaps along tunnel direction, ensures the complete of bottom closure circle.
The present invention can be widely used in advance support in the construction of Support System in Soft Rock Tunnels benching tunnelling method.
Brief description of the drawings
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
Fig. 1 is construction equipment detail drawing.
Fig. 2 is construction equipment fundamental diagram.
Fig. 3 is consolidation effect figure.
Fig. 4 is shower nozzle detail drawing.
Fig. 5 is the right view of Fig. 4.
Reference numeral: 1-right side overlap, 2-left side overlap, 3-cambered way, 4-frame, 5-rack rail, 6-fixes balladeur train, 7-moves balladeur train, 8-hydraulic jack, 9-clamper, 10-arc drilling rod, 11-high-pressure water pipe, 12-side nozzle, 13-front nozzle, 14-enters hole, ground, 15-opening-closing type guide and limit circle, the 16-step surface of constructing, 17-bearing pin, 18-locating hole, overlap in the middle of 19-, 20-shower nozzle, 21-water under high pressure mud pipe, 22-left side hoop reinforcing soleplate, 23-right side hoop reinforcing soleplate, 24-horizontal jet grouting advance support, 25-preliminary bracing, 26-secondary lining, 27-wireless position sensor, 28-side nozzle slurry-feeding hole, 29-front nozzle inlet opening.
Detailed description of the invention
Embodiment is referring to shown in Fig. 2 and Fig. 3, and wherein, the dotted line in Fig. 2 represents, the running orbit of arc drilling rod in construction equipment.A kind of tunnel arch springing hoop high-pressure injection reinforcement means, step is as follows:
Step 1, taking topping bar of having excavated or middle step as construction step surface 16, with Tapper, at construction step surface 16 bilateral symmetry tunnel axis, that outputs two row's arc drilling rods 10 by designing requirement enters hole 14, ground;
Step 2, rack rail 5 is fixed on to the left side of construction step surface 16 by installation dimension, to be fixed on rack rail 5 with the frame 4 of fixing balladeur train 6 and mobile balladeur train 7, complete the connection of first arc drilling rod 10, shower nozzle 20 and high-pressure water pipe 11, water under high pressure mud pipe 21 simultaneously, then the opening-closing type guide and limit circle 15 on the clamper 9 of opening mobile balladeur train 7 tops and cambered way 3, grips first arc drilling rod 10;
Step 3, starts high pressure pumping plant, and the 13 dozens of water under high pressures of front nozzle by high-pressure water pipe 11 to shower nozzle 20 carry out jet cutting to hole, the ground 14 front soil bodys that enter of arc drilling rod 10, and loose soil layer, creates conditions for arc drilling rod 10 buries; Hydraulic power unit, to hydraulic jack 8 fuel feeding, promotes mobile balladeur train 7 and clamper 9 arc drilling rod 10 is buried along arching trajectory simultaneously;
Step 4, hydraulic jack 8 reaches after stroke end of a period, unclamps clamper 9, and hydraulic jack 8 shrinks, and drives mobile balladeur train 7 and clamper 9 to withdraw original position, and first arc drilling rod of order clamping 10 realized and being sent to;
Step 5, complete several times send to the 10 spreading work of arc drilling rod after, when the drill bit of arc drilling rod 10 arrives middle the overlap 19 of design, high pressure pumping plant stops to 13 dozens of water under high pressures of front nozzle, front nozzle finishes to cut;
Step 6, high pressure pumping plant starts by two water under high pressure mud pipes 21 to 12 dozens of water under high pressure mud of four side nozzles, arc drilling rod 10 under the acting in conjunction of hydraulic jack 8, clamper 9 and mobile balladeur train 7 by high-pressure injection technical requirements at a slow speed order withdraw, side nozzle 12 is implemented directed high-pressure injection to tunnel axis front and back, until left side overlap 2, the overlap joint of realization and left side horizontal jet grouting stake, completes the construction of left side hoop reinforcing soleplate 22;
Step 7, arc drilling rod 10 withdraws high-pressure injection complete after, close high pressure pumping plant, by arc drilling rod 10 withdraw to construction step surface 16, construction equipment move to along rack rail to tunnel bearing of trend the next one enter ground hole 14;
Step 8, after construction equipment is fixed, repeating step three is to step 7 until complete all stations constructions in tunnel axis left side;
Step 9, at the same mounting and construction equipment in tunnel axis right side, repeating step eight is realized sending to of arc drilling rod 10 and is withdrawn high-pressure injection, complete the construction of right side hoop reinforcing soleplate 23, right side hoop reinforcing soleplate and left side hoop reinforcing soleplate are realized overlap joint at middle overlap 19, realize overlap joint with right side horizontal jet grouting stake at right side overlap 19, so far the curtain being made up of left side hoop reinforcing soleplate 22 and right side hoop reinforcing soleplate 23 that forms series of parallel at tunnel bottom, this curtain and horizontal jet grouting advance support 24 form closed reinforcement circle.Under the supporting of closed reinforcement circle, carry out successively preliminary bracing 25 and secondary lining 26.
Described step 2, in the time of the mounting and construction equipment of tunnel axis left side, at tunnel axis right side while mounting and construction equipment, after first station in tunnel axis left side has been constructed, start to realize arc drilling rod 10 at first station on tunnel axis right side according to step 3 to step 7 and send and withdraw high-pressure injection to, complete the construction of right side hoop reinforcing soleplate 23, form a curtain being formed by left side hoop reinforcing soleplate 22 and right side hoop reinforcing soleplate 23 at tunnel bottom, then constantly alternately construction of left and right, finally form series of parallel by left side hoop reinforcing soleplate 22, the closed reinforcement circle that right side hoop reinforcing soleplate 23 and horizontal jet grouting advance support 24 form, described left side hoop reinforcing soleplate 22 and the right side hoop reinforcing soleplate 23 middle overlap 19 of formation respectively of overlap joint mutually, described left side hoop reinforcing soleplate 22 and horizontal jet grouting advance support 24 be the left side of the formation respectively overlap 2 of overlap joint mutually, described right side hoop reinforcing soleplate 23 and horizontal jet grouting advance support 24 right side of the formation respectively overlap 1 of overlap joint mutually.
The end face of described left side overlap 2 and right side overlap 1 is all positioned at construction 16 times 1.5 meters of depths of step surface.
In described step 3, the pressure of described water under high pressure is 25~30MPa.
In described step 6, the pressure of described water under high pressure mud is 35~40MPa.
The construction equipment adopting in described tunnel arch springing hoop high-pressure injection reinforcement means, referring to Fig. 1, comprise rack rail 5, frame 4, cambered way 3, mobile balladeur train 7, fixing balladeur train 6, hydraulic jack 8, arc drilling rod 10, high pressure pumping plant and hydraulic power unit, described rack rail 5 is parallel to tunnel axis direction and is arranged near on the construction step surface 16 of arch springing by installation dimension requirement, described frame 4 is erected on rack rail 5, described frame 4 end faces have set up cambered way 3, described cambered way 3 end faces are connected with opening-closing type guide and limit circle 15, the spaced apart locating hole 18 that is provided with on its facade, described mobile balladeur train 7 and fixing balladeur train 6 are inserted in cambered way 3, wherein, the top of described mobile balladeur train 7 is connected with clamper 9, it is fixing with cambered way 3 that described fixing balladeur train 6 inserts locating hole 18 by bearing pin 17, described mobile balladeur train 7 is flexibly connected with cambered way 3, between fixing balladeur train 6 and mobile balladeur train 7, connect by hydraulic jack 8, described hydraulic jack 8 is circumscribed with hydraulic power unit,
The axis parallel of described arc drilling rod 10 and cambered way 3, its clamping by clamper 9 and mobile balladeur train 7 are fixing, and by opening-closing type guide and limit circle 15, it are carried out to guide and limit; In described arc drilling rod 10, be inserted with a high-pressure water pipe 11 and two water under high pressure mud pipes 21, the head of described high-pressure water pipe 11 is communicated with the front nozzle 13 on arc drilling rod 10 front end shower nozzles 20, side nozzle 12 on the shower nozzle 20 of the head of described water under high pressure mud pipe 21 and arc drilling rod 10 front ends is communicated with, and the afterbody of described high-pressure water pipe 11 and two water under high pressure mud pipes 21 is all connected with high pressure pumping plant.
Described cambered way 3 is made up after by design size stretch bending of H shaped steel.
Described side nozzle 12 respectively arranges two every 180 ° on shower nozzle 20, and when construction, injection direction is parallel to tunnel axis direction.
In the sidewall notches of described shower nozzle 20, be fixed with wireless position sensor 27, described wireless position sensor 27 sends to position indicator by wireless launcher by position signalling.Referring to Fig. 4 and Fig. 5, the side nozzle slurry-feeding hole 28 on shower nozzle is connected with the head of water under high pressure mud pipe 21, and front nozzle inlet opening is connected with the head of high-pressure water pipe 11.Front nozzle 13 is positioned at front nozzle inlet opening foremost, and described side nozzle 12 is positioned at side nozzle slurry-feeding hole 28 foremost.
The operating principle of construction equipment is: arch slideway can move along tunnel axis direction along rack rail.Fixing balladeur train 6 and mobile balladeur train 7 are arranged on cambered way 3, are connected between the two by hydraulic jack 8, and by stretching of hydraulic jack 8, mobile balladeur train 7 can move back and forth along cambered way 3.Clamper 9 is fixed on the top of mobile balladeur train 7, can realize the clamping to arc drilling rod 10.Arc drilling rod 10 is processed into fixed length, need to connect chi send to according to strengthening length.There are a high-pressure water pipe 11 and two water under high pressure mud pipes 21 in arc drilling rod 10 inside, are connected respectively with the front nozzle 13 of shower nozzle and four side nozzles 12 of the both sides of meeting and discussing, and can realize the 10 front soil body jet cuttings of arc drilling rod and side direction high-pressure injection and reinforce.Open clamper 9 and opening-closing type guide and limit circle 15, concentric with arch slideway after arc drilling rod 10 clampings.Under the phorogenesis of the flexible and mobile balladeur train of the clamping of carriage assembly clamper, balladeur train oil cylinder, can realize sending to and withdrawing of crooked drill pipe.

Claims (9)

1. a tunnel arch springing hoop high-pressure injection reinforcement means, is characterized in that: step is as follows:
Step 1, taking topping bar of having excavated or middle step as construction step surface (16), with Tapper, at construction step surface (16) bilateral symmetry tunnel axis, that outputs two row's arc drilling rods (10) by designing requirement enters hole, ground (14);
Step 2, rack rail (5) is fixed on to the left side of construction step surface (16) by installation dimension, to be fixed on rack rail (5) with the frame (4) of fixing balladeur train (6) and mobile balladeur train (7), complete the connection of first arc drilling rod (10), shower nozzle (20) and high-pressure water pipe (11), water under high pressure mud pipe (21) simultaneously, then the opening-closing type guide and limit circle (15) on the clamper (9) of opening mobile balladeur train (7) top and cambered way (3), grips first arc drilling rod (10);
Step 3, start high pressure pumping plant, beat water under high pressure by high-pressure water pipe (11) to the front nozzle (13) of shower nozzle (20), below, hole, ground (14) soil body that enters of arc drilling rod (10) is carried out to jet cutting, loose soil layer, creates conditions for arc drilling rod (10) buries; Hydraulic power unit, to hydraulic jack (8) fuel feeding, promotes mobile balladeur train (7) and clamper (9) arc drilling rod (10) is buried along arching trajectory simultaneously;
Step 4, hydraulic jack (8) reaches after stroke end of a period, unclamps clamper (9), and hydraulic jack (8) shrinks, and drives mobile balladeur train (7) and clamper (9) to withdraw original position, and order first arc drilling rod of clamping (10) realized and being sent to;
Step 5, complete several times send to arc drilling rod (10) spreading work after, when the drill bit of arc drilling rod (10) arrives middle the overlap (19) of design, high pressure pumping plant stops beating water under high pressure to front nozzle (13), front nozzle finishes to cut;
Step 6, high pressure pumping plant starts to beat water under high pressure mud by two water under high pressure mud pipes (21) to four side nozzles (12), arc drilling rod (10) under the acting in conjunction of hydraulic jack (8), clamper (9) and mobile balladeur train (7) by high-pressure injection technical requirements at a slow speed order withdraw, side nozzle (12) is implemented directed high-pressure injection to tunnel axis front and back, until left side overlap (2), the overlap joint of realization and left side horizontal jet grouting stake, completes the construction of left side hoop reinforcing soleplate (22);
Step 7, arc drilling rod (10) withdraws high-pressure injection complete after, close high pressure pumping plant, by arc drilling rod (10) withdraw to construction step surface (16), construction equipment move to along rack rail to tunnel bearing of trend the next one enter ground hole (14);
Step 8, after construction equipment is fixed, repeating step three is to step 7 until complete all stations constructions in tunnel axis left side;
Step 9, at the same mounting and construction equipment in tunnel axis right side, what repeating step eight was realized arc drilling rod (10) sends and withdraws high-pressure injection to, complete the construction of right side hoop reinforcing soleplate (23), right side hoop reinforcing soleplate and left side hoop reinforcing soleplate are realized overlap joint at middle overlap (19), realize overlap joint with right side horizontal jet grouting stake at right side overlap (1), so far form the curtain being formed by left side hoop reinforcing soleplate (22) and right side hoop reinforcing soleplate (23) of series of parallel at tunnel bottom, this curtain and horizontal jet grouting advance support (24) form closed reinforcement circle.
2. arch springing hoop high-pressure injection reinforcement means in tunnel according to claim 1, it is characterized in that: described step 2, in the time of the mounting and construction equipment of tunnel axis left side, at tunnel axis right side while mounting and construction equipment, after first station in tunnel axis left side has been constructed, start to realize arc drilling rod (10) at first station on tunnel axis right side according to step 3 to step 7 and send and withdraw high-pressure injection to, complete the construction of right side hoop reinforcing soleplate (23), form a curtain being formed by left side hoop reinforcing soleplate (22) and right side hoop reinforcing soleplate (23) at tunnel bottom, then constantly alternately construction of left and right, finally form series of parallel by left side hoop reinforcing soleplate (22), the closed reinforcement circle of right side hoop reinforcing soleplate (23) and horizontal jet grouting advance support (24) composition, described left side hoop reinforcing soleplate (22) and right side hoop reinforcing soleplate (23) the middle overlap of formation respectively (19) of overlap joint mutually, described left side hoop reinforcing soleplate (22) and horizontal jet grouting advance support (24) be the left side overlap of formation respectively (2) of overlap joint mutually, described right side hoop reinforcing soleplate (23) and horizontal jet grouting advance support (24) be the right side of the formation respectively overlap (1) of overlap joint mutually.
3. arch springing hoop high-pressure injection reinforcement means in tunnel according to claim 2, is characterized in that: the end face of described left side overlap (2) and right side overlap (1) is all positioned at the construction lower 1.5 meters of depths of step surface (16).
4. arch springing hoop high-pressure injection reinforcement means in tunnel according to claim 1, is characterized in that: in described step 3, the pressure of described water under high pressure is 25~30MPa.
5. arch springing hoop high-pressure injection reinforcement means in tunnel according to claim 1, is characterized in that: in described step 6, the pressure of described water under high pressure mud is 35~40MPa.
6. the construction equipment adopting in the tunnel arch springing hoop high-pressure injection reinforcement means described in the claims 1 to 5 any one, it is characterized in that: comprise rack rail (5), frame (4), cambered way (3), mobile balladeur train (7), fixing balladeur train (6), hydraulic jack (8), arc drilling rod (10), high pressure pumping plant and hydraulic power unit, described rack rail (5) is parallel to tunnel axis direction and is arranged near on the construction step surface (16) of arch springing by installation dimension requirement, described frame (4) is erected on rack rail (5), described frame (4) end face has set up cambered way (3), described cambered way (3) end face is connected with opening-closing type guide and limit circle (15), the spaced apart locating hole (18) that is provided with on its facade, described mobile balladeur train (7) and fixing balladeur train (6) are inserted in cambered way (3), wherein, the top of described mobile balladeur train (7) is connected with clamper (9), it is fixing with cambered way (3) that described fixing balladeur train (6) inserts locating hole (18) by bearing pin (17), described mobile balladeur train (7) is flexibly connected with cambered way (3), between fixing balladeur train (6) and mobile balladeur train (7), connect by hydraulic jack (8), described hydraulic jack (8) is circumscribed with hydraulic power unit,
The axis parallel of described arc drilling rod (10) and cambered way (3), its clamping by clamper (9) and mobile balladeur train (7) are fixing, and by opening-closing type guide and limit circle (15), it are carried out to guide and limit; In described arc drilling rod (10), be inserted with a high-pressure water pipe (11) and two water under high pressure mud pipes (21), front nozzle (13) on the shower nozzle (20) of the head of described high-pressure water pipe (11) and arc drilling rod (10) front end is communicated with, side nozzle (12) on the shower nozzle (20) of the head of described water under high pressure mud pipe (21) and arc drilling rod (10) front end is communicated with, and the afterbody of described high-pressure water pipe (11) and two water under high pressure mud pipes (21) is all connected with high pressure pumping plant.
7. construction equipment according to claim 6, is characterized in that: described cambered way (3) is made up after by design size stretch bending of H shaped steel.
8. construction equipment according to claim 6, is characterized in that: described side nozzle (12) respectively arranges two every 180 ° shower nozzle (20) is upper, and when construction, injection direction is parallel to tunnel axis direction.
9. construction equipment according to claim 6, is characterized in that: in the sidewall notches of described shower nozzle (20), be fixed with wireless position sensor (27), described wireless position sensor (27) sends to position indicator by wireless launcher by position signalling.
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