CN109989759A - A kind of richness Water containing silty and fine sand bed shield launching design reinforcement method - Google Patents
A kind of richness Water containing silty and fine sand bed shield launching design reinforcement method Download PDFInfo
- Publication number
- CN109989759A CN109989759A CN201910213173.4A CN201910213173A CN109989759A CN 109989759 A CN109989759 A CN 109989759A CN 201910213173 A CN201910213173 A CN 201910213173A CN 109989759 A CN109989759 A CN 109989759A
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- Prior art keywords
- fixed
- template
- hole
- positioning
- fine sand
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/102—Removable shuttering; Bearing or supporting devices therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0607—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield being provided with devices for lining the tunnel, e.g. shuttering
Abstract
The invention discloses a kind of rich Water containing silty and fine sand bed shield launching design reinforcement methods, include the following steps: (a) preparation of construction；(b) centralized positioning；(c) corner positions；(d) it reinforces；(e) maintenance molding.Present invention process is simple, and difficulty of construction is low, and it is convenient to operate, and construction efficiency is high, and consolidation effect is good, and security performance is high, can be adjusted flexibly in work progress, is conducive to improve strengthening quality, is applicable to the shield launching end of different hole sizes, applied widely.
Description
Technical field
The invention belongs to subway engineering technical field more particularly to a kind of rich Water containing silty and fine sand bed shield launching design reinforcements
Method.
Background technique
In shield construction process, shield originate and reception be easy to happen earth's surface deformation it is excessive collapse etc. accidents, especially
When it is that end reinforcing body fails to reach design requirement or reinforce failure, safety accident easily occurs.Shield machine in export & import,
Working face will be in open state, and this open state is by last longer.If dealt with improperly, underground water gushes sand, water burst
Etc. active well will be entered, portal can be caused to cave under serious conditions.Therefore end reinforcement seems pole in shield-tunneling construction
It is important.
Currently used shield launching end reinforcement means mainly has deep-mixed pile to reinforce, rotary churning pile is reinforced, slip casting adds
The methods of Gu, but when in face of rich in pigment fine sand formation condition, the above reinforcement means has the following disadvantages:
1, due to the inhomogeneities on stratum, the adaptability of mixing pile is poor, and presses during high-pressure rotary-spray and grouting and reinforcing
Power control difficulty is larger, be easy to cause Ground to swell, is affected to surrounding enviroment；
2, reinforcing body and preliminary bracing interface consolidation effect are undesirable, and need manually to abolish portal, break
It some times happens that face collapses when except portal, and that there are operating spaces is narrow, and risk is big, and working efficiency is low, long in time limit etc.
Problem；
3, consolidation effect cannot be effectively ensured, and Sand phenomenon easily occurs in when shield, or even collapses.
Summary of the invention
Above-mentioned technical problem present in present invention aims to solve the prior art provides a kind of rich Water containing silty and fine sand bed
Shield launching design reinforcement method, simple process, difficulty of construction is low, and it is convenient to operate, and construction efficiency is high, and consolidation effect is good, safety
Performance is high, can be adjusted flexibly in work progress, is conducive to improve strengthening quality, is applicable to the shield launching end of different hole sizes
Head, it is applied widely.
In order to solve the above-mentioned technical problem, the present invention adopts the following technical scheme:
A kind of richness Water containing silty and fine sand bed shield launching design reinforcement method, it is characterised in that include the following steps:
(a) preparation of construction: cleaning shield end construction surface goes out the reinforcing into hole end according to design drawing measuring
Region, aperture contour line and center spray reinforcing area and aperture contour line into hole end with red paint, are marked with intubation
Center；
(b) centralized positioning:
(1) T-type expansion bracket and arc protective board group are dressed up into locating support, the fixation convex block of one piece of positioning plate one end is caught in
In positioning groove on to adjacent positioned plate, each locating support is made to join end to end, forms positioning member；
(2) then by the positioning member by being placed on into the construction surface of hole end, in geometry made of enclosing each positioning plate
The heart and be located in same horizontal line into the center of hole end, according to the length of aperture contour line adjustment T-type expansion bracket, make arc protective
Plate is located at the outside of aperture contour line, and then mounting plate is temporarily fixed at into hole end construction surface in such a way that nailing is fixed
On；
(c) corner positions:
(1) in the fixed L-type corner protector frame of four edge nailings of reinforcing area, make between L-type corner protector frame and boundary line away from
From control in 400~600mm；
(2) then freezing pipe is inserted into from the fixed jack on L-type corner protector frame, until being inserted into hole end construction surface
In soil layer, coolant liquid is then injected into freezing pipe, until coolant liquid is excessive, blocks the nozzle of freezing pipe；
(d) it reinforces:
(1) the support arm on arc backplate is rotated, fixed arm is transferred in accommodate groove through fixed fluting, then by slip casting
Pipe injects note into Grouting Pipe until being inserted into the soil layer of hole end construction surface from the positioning through hole insertion on fixed arm
Then slurries block the nozzle of Grouting Pipe until injection slurry is excessive；
(2) T-type expansion bracket is removed one by one；
(e) maintenance molding:
(1) side template, end template are set up along the boundary line of reinforcing area, set up mould along the inner wall block-by-block of arc backplate
Plate forms circular template, front apron will be set up between circular template and side template, end template, so that front apron and side template, bottom
It is formed between template, circular template and pours chamber；
(2) pre-configured C15 plain concrete is injected from pouring top of chamber, until C15 plain concrete slurries are from pouring chamber
Top is overflowed, and then will be poured chamber by installation top template and be bound, each piece of template and front apron are removed after the completion of maintenance.
Further, locating support includes T-type expansion bracket and arc backplate in step (b), T-type expansion bracket include positioning plate,
Fixed link and loop bar, one end activity of fixed link is in loop bar, and positioning plate is set to the other end of fixed link, and one end of positioning plate is set
There is fixed convex block, positioning plate is equipped with positioning groove, and positioning groove is corresponding with fixed convex block, leads between loop bar and arc backplate
It crosses anchor bolt to fix, arc backplate is equipped with mounting plate, and mounting plate is equipped with mounting hole, is connected with support on arc backplate
Arm, one end of support arm are connected with fixed arm, and fixed arm is equipped with positioning through hole, and positioning rack structure is simple, and dismounting difficulty is low,
Convenient transportation, convenient for live flexible arrangement, strong applicability；The fixation convex block of the positioning plate end of one locating support is snapped onto
In positioning groove on the positioning plate of adjacent positioned bracket, realization joins end to end, and locating support is fitted together, and can be used for pair
The center of middle shield end, then the collapsing length of T-type expansion bracket is adjusted, it is taken turns to realize according to practical shield aperture
The installation site of wide size positioning arc backplate, it is applied widely convenient for positioning into hole, avoid the operation to punch again and
On integrally-built influence when punching, difficulty of construction is greatly reduced.
Further, one end of loop bar is equipped with fixed block, and fixed block is equipped with fixed counterbore, and arc backplate is equipped with limit spiral shell
Hole, anchor bolt are set between limit screw hole and fixed counterbore, realize being detachably connected for T-type expansion bracket and arc backplate, even
Connect reliable, easy to operate, T-type expansion bracket removes rear reusable, improves the utilization rate of resource, saves construction cost.
Further, accommodate groove and fixed jack, the inside of L-type corner protector frame are respectively equipped in step (c) on L-type corner protector frame
It slots equipped with fixed, fixed fluting is communicated with accommodate groove, and L-type corner protector frame is equipped with set square, and set square is equipped with fixed anchor
Hole squeezes into holdfast into fixed anchor hole, set square can be fixed in construction surface, plays the effect of preliminary installation positioning.
Further, first reinforcing bar is inserted into Grouting Pipe before slip casting in step (d), until being inserted into hole end
In the soil layer of construction surface, then together by binding reinforcing bars, then injection slurry is injected into Grouting Pipe, after injection slurry solidification, one
The soil body of aspect and construction surface forms reinforcing body, so that Grouting Pipe is not easy to fall off from construction surface, so that fixed arm is more difficult to take off
From L-type corner protector frame, being completely embedded property is improved, another aspect injection slurry forms the reinforcing of higher intensity in being wrapped in reinforcing bar
Body improves consolidation effect, and reinforcing bar also plays a supporting role to Grouting Pipe, so that Grouting Pipe is not easy to topple over, improves slip casting
Pipe plug after fastness.
Further, in step (d) after blocking Grouting Pipe, steel pipe is plugged in the accommodate groove on L-type corner protector frame, until
Steel pipe is inserted into 200~300mm in the soil layer of hole end construction surface, and the distance between adjacent steel pipe is 100~200mm, so
Inject injection slurry in backward steel pipe, until injection slurry is excessive, block the nozzle of steel pipe, after injection slurry solidification in steel pipe pile,
Structural strength is high, improves consolidation effect, after casting concrete, passes through between adjacent steel pipe, between steel pipe and L-type corner protector frame
Concrete is connected, and constitutes composite wall, preferably bears to avoid collapsing, resistance to compression into the soil body extruding force of hole end construction surface
It is durable.
Further, in step (e) after binding, to front apron, side template, end template and circular template use respectively batten into
Row bracing reinforcement, the stability after improving front apron, side template, end template and circular template installation, it is not easy to it loosens or disengages,
To reduce plain concrete exoserosis, guarantee the Forming Quality and structural strength of composite wall.
Further, it in step (e) after binding, will be overflowed from the gap between adjacent forms, between template and baffle
Plain concrete slurries strike off, avoid extravasation plain concrete slurries expand with heat and contract with cold effect under extrusion die plate, cause junction
Gap becomes larger and affects the Forming Quality of composite wall, and avoids template, baffle packet after the plain concrete grout cures of extravasation
It wraps up in and is not easy to later period dismounting.
Further, the coolant liquid in step (c) is the hypothermic saline between -20 DEG C~-10 DEG C, and refrigerating effect is good, when cold
But after liquid stream enters into the soil layer of hole end construction surface, by underground water and soil sand be frozen into some strength, it is fluid-tight freeze plus
Solid preferably strengthens the soil body of rich Water containing silty and fine sand bed, so that water burst accident occur when preventing shield launching from constructing.
Further, the injection slurry in step (d) is cement-silicate dual slurry, and injection slurry is to fill, permeate and compacted etc.
Mode drives away moisture and gas between layer of sand and clay particle, and fills its position, by mineral contained in cement and the soil body
Water and soil hydrolysis, hydration reaction and granulationn etc. occur respectively, suspension colloid and dough are formed, so that soil layer be made to obtain
It reinforces.
The present invention is by adopting the above-described technical solution, have the advantages that
T-type expansion bracket and arc protective board group are first dressed up into locating support, then each locating support is joined end to end, forms positioning
Component, is then directed at the center of shield end by positioning member, then adjusts the length of T-type expansion bracket, has adjusted
Arc backplate is fixed after finishing, so that border circular areas made of each arc backplate encloses mutually is fitted with the hole into hole end
Match, to reduce influence when shield construction, reserved hole, on the one hand punched convenient for shield machine, eliminates artificial
On the other hand the operation abolished located hole on integrally-built influence when avoiding the operation to punch again and punching, with
This is arranged around as construction reference center, from center, greatly reduces difficulty of construction, and it is more convenient to construct.
Then in the fixed L-type corner protector frame of four edges of reinforcing area, make the boundary line of L-type corner protector frame and reinforcing area
Between keep at a distance, consequently facilitating concrete wraps up L-type corner protector frame, merges into an organic whole after later period casting concrete, play
Protective effect avoids L-type corner protector frame exposed and influences the stability of entire reinforcement system；Then by freezing pipe from L-type corner protector frame
On fixed jack insertion coolant liquid is injected, when coolant liquid is flowed into hole until be inserted into the soil layer of hole end construction surface
After in the soil layer of end construction surface, underground water and soil sand are frozen into some strength, fluid-tight consolidation by freezing body, preferably plus
Consolidate the soil body of rich Water containing silty and fine sand bed, so that water burst accident, the freezing pipe after freezing occur when preventing shield launching from constructing
It plays a supporting role to L-type corner protector frame, so that L-type corner protector frame is not easy to fall off from construction surface, improves the installation of L-type corner protector frame
Stability afterwards.
Then the support arm on arc backplate is rotated, fixed arm is transferred in accommodate groove through fixed fluting, it then will note
It starches pipe and injects injection slurry, slip casting until being inserted into the soil layer of hole end construction surface from the positioning through hole insertion on fixed arm
Reinforcing body is formed with the soil body of construction surface after liquid solidification, so that Grouting Pipe is not easy to fall off from construction surface, so that fixed arm is more
Hardly possible is detached from L-type corner protector frame, improves being completely embedded property, and fixed arm can not be movable, and support arm also can not be movable, leads to arc backplate
Also can not be movable, it realizes that arc backplate links together with the limitation of L-type corner protector frame, mutually restrains, formation Anti-pressure reinforcing body, surely
It is qualitative good, it is not easy to fall apart, use durable length.By the way of freezing, slip casting combines, can effectively it reinforce rich in pigment fine sand
Percolating water accident occurs when preventing shield from constructing for stratum.
After T-type expansion bracket is removed, then appear out into the hole of hole end, then carry out template and set up, by stabilization zone
Each component in domain encloses, and formation pours chamber, injects C15 plain concrete, and C15 plain concrete melts into being wrapped in each component
One, is closely connected, and each component and pipe depend on carrier as C15 plain concrete, improves the knot after C15 plain concrete solidifies
Structure intensity and shearing strength form composite wall, and compression strength height, good integrity, structural stability are high, effectively strengthen the shield beginning
Originator head, improves the safety of construction.
Present invention process is simple, and difficulty of construction is low, and it is convenient to operate, and construction efficiency is high, and consolidation effect is good, and security performance is high,
It can be adjusted flexibly in work progress, be conducive to improve strengthening quality, be applicable to the shield launching end of different hole sizes, be applicable in
Range is wide.
Detailed description of the invention
The present invention will be further explained below with reference to the attached drawings:
Fig. 1 is the scheme of installation of locating support and L-type corner protector frame in the present invention；
Fig. 2 is the structural schematic diagram that T-type expansion bracket is connected with arc backplate in the present invention；
Fig. 3 be the present invention in freezing pipe, Grouting Pipe and steel pipe plug after structural schematic diagram；
Fig. 4 is the structural schematic diagram of L-type corner protector frame in the present invention；
Fig. 5 is the structural schematic diagram of adjacent T-type expansion bracket assembling in the present invention；
Fig. 6 be the present invention in each template set up after structural schematic diagram.
In figure: 1- construction surface；2-T type expansion bracket；3- arc backplate；4- positioning plate；5- fixed link；6- loop bar；7- is fixed
Convex block；8- positioning groove；9- mounting plate；10- mounting hole；11- support arm；12- fixed arm；13- positioning through hole；14- fixed block；
15- fixes counterbore；16- limits screw hole；17- anchor bolt；18-L type corner protector frame；19- accommodate groove；20- fixed jack；21-
Fixed fluting；22- set square；23- fixes anchor hole；24- freezing pipe；25- Grouting Pipe；26- reinforcing bar；27- steel pipe；28- side template；
29- end template；30- circular template；31- front apron；32- top template.
Specific embodiment
It as shown in Figures 1 to 6, is a kind of rich Water containing silty and fine sand bed shield launching design reinforcement method of the present invention, including such as
Lower step:
(a) preparation of construction: cleaning shield end construction surface 1 goes out adding into hole end according to design drawing measuring
Gu region, aperture contour line and center spray reinforcing area and aperture contour line into hole end with red paint, are marked with intubation
Remember center, eye-catching label accelerates construction progress convenient for positioning construction.
(b) centralized positioning: locating support includes T-type expansion bracket 2 and arc backplate 3, T-type expansion bracket 2 include positioning plate 4,
Fixed link 5 and loop bar 6, in loop bar 6, positioning plate 4 is set to the other end of fixed link 5, positioning plate 4 for one end activity of fixed link 5
One end be equipped with fixed convex block 7, positioning plate 4 is equipped with positioning groove 8, and positioning groove 8 is corresponding with fixation convex block 7, arc protective
Plate 3 is equipped with mounting plate 9, and mounting plate 9 is equipped with mounting hole 10, and the nailing into mounting hole 10 realizes the fixation of arc backplate 3.
Support arm 11 is connected on arc backplate 3, one end of support arm 11 is connected with fixed arm 12, and fixed arm 12 is equipped with positioning through hole
13, positioning rack structure is simple, and dismounting difficulty is low, convenient transportation, convenient for live flexible arrangement, strong applicability；By one when assembling
The fixation convex block 7 of 4 end of positioning plate of a locating support snaps onto the positioning groove 8 on the positioning plate 4 of adjacent positioned bracket,
Realization joins end to end, and locating support is fitted together, and can be used for the center of centering shield end, then adjusts T-type
The collapsing length of expansion bracket 2, to realize the installation site for positioning arc backplate 3 according to practical shield aperture profile size, just
It is applied widely in positioning into hole, on integrally-built influence when avoiding the operation to punch again and punching, substantially reduce
Difficulty of construction.One end of loop bar 6 is equipped with fixed block 14, and fixed block 14 is equipped with fixed counterbore 15, and arc backplate 3 is equipped with limit
Position screw hole 16, limits and is equipped with anchor bolt 17 between screw hole 16 and fixed counterbore 15, realizes T-type expansion bracket 2 and arc backplate 3
It is detachably connected, connection is reliable, easy to operate, and T-type expansion bracket 2 removes rear reusable, improves the utilization rate of resource, saves
Construction cost is saved.
(1) T-type expansion bracket 2 and arc backplate 3 are first assembled into locating support, it is fixed by anchor bolt 17, it is fixed by one piece
The fixation convex block 7 of position 4 one end of plate snaps onto the positioning groove 8 on adjacent positioned plate 4, so that each locating support is joined end to end, shape
At positioning member.
(2) then by the positioning member by being placed on into hole end construction surface 1, geometry made of enclosing each positioning plate 4
Center and be located in same horizontal line into the center of hole end, according to the length of aperture contour line adjustment T-type expansion bracket 2, make arc
Shape backplate 3 is located at the outside of aperture contour line, and then mounting plate 9 is temporarily fixed at into hole end in such a way that nailing is fixed
In construction surface 1, first passes through positioning member and be directed at the center into hole end, then adjust the length of T-type expansion bracket 2, so that each arc
Border circular areas made of backplate 3 encloses is adapted with into the hole of hole end, thus reduce influence when shield construction,
Positioning construction, convenient time saving, construction efficiency is high, reduces difficulty of construction.
(c) corner positions: accommodate groove 19 and fixed jack 20 are respectively equipped on L-type corner protector frame 18, L-type corner protector frame 18
Inside is equipped with fixed fluting 21, and fixed fluting 21 is communicated with accommodate groove 19, and L-type corner protector frame 18 is equipped with set square 22, triangle
Plate 22 is equipped with fixed anchor hole 23, squeezes into holdfast into fixed anchor hole 23, set square 22 can be fixed in construction surface 1, to L-type
Corner protector frame 18 plays the effect of preliminary installation positioning.
(1), in the fixed L-type corner protector frame 18 of four edge nailings of reinforcing area, make between L-type corner protector frame 18 and boundary line
Distance controlling in 400~600mm, retain enough spacing, consequently facilitating concrete protects L-type after later period casting concrete
Corner bracket 18 wraps up, and merges into an organic whole, plays a protective role, and avoids L-type corner protector frame 18 exposed and influences entire reinforcement system
Stability.
(2) then freezing pipe 24 is inserted into from the fixed jack 20 on L-type corner protector frame 18, is applied until being inserted into hole end
In the soil layer in work face 1, coolant liquid then is injected into freezing pipe 24, until coolant liquid is excessive, blocks the nozzle of freezing pipe 24, it is cold
But liquid is the hypothermic saline between -20 DEG C~-10 DEG C, and refrigerating effect is good, when coolant liquid flows into the soil layer into hole end construction surface 1
In after, underground water and soil sand are frozen into some strength, fluid-tight consolidation by freezing body, preferably strengthened rich in pigment fine sand
The soil body of layer, so that water burst accident occur when preventing shield launching from constructing, the freezing pipe 24 after freezing also plays L-type corner protector frame 18
To supporting role, so that L-type corner protector frame 18 is not easy to fall off from construction surface 1, improve firm after L-type corner protector frame 18 is installed
Property.
(d) it reinforces:
(1) the support arm 11 on arc backplate 3 is rotated, fixed arm 12 is transferred in accommodate groove 19 through fixed fluting 21, is connect
Grouting Pipe 25 is inserted into from the positioning through hole 13 on fixed arm 12, until be inserted into the soil layer of hole end construction surface 1 200
Then reinforcing bar 26 is inserted into Grouting Pipe 25 by~300mm, until be inserted into the soil layer of hole end construction surface 1 400~
Then 500mm bands together reinforcing bar 26, then injection slurry is injected into Grouting Pipe 25, blocks the nozzle of Grouting Pipe 25, works as note
After grout cures, reinforcing body on the one hand is formed with the soil body of construction surface 1, so that Grouting Pipe 25 is not easy to fall off from construction surface 1,
So that fixed arm 12 is more difficult to be detached from L-type corner protector frame 18, being completely embedded property is improved, fixed arm 12 can not be movable, support arm 11
Can not be movable, cause arc backplate 3 also can not be movable, realizes that arc backplate 3 links together with the limitation of L-type corner protector frame 18, phase
Mutually restrain；Another aspect injection slurry forms the reinforcing body of higher intensity, improves consolidation effect, steel in being wrapped in reinforcing bar 26
Muscle 26 also plays a supporting role to Grouting Pipe 25, so that Grouting Pipe 25 is not easy to topple over, improves the jail after Grouting Pipe 25 plugs
Solidity.
Then steel pipe 27 is plugged in the accommodate groove 19 on L-type corner protector frame 18, until steel pipe 27 is inserted into hole end
200~300mm in the soil layer of construction surface 1, the distance between adjacent steel pipe 27 are 100~200mm, are then injected into steel pipe 27
Injection slurry blocks the nozzle of steel pipe 27, injection slurry is cement-silicate dual slurry, after injection slurry solidification until injection slurry is excessive
The pile in steel pipe 27, structural strength are high, improve consolidation effect, after casting concrete, between adjacent steel pipe 27, steel pipe 27
It is connected between L-type corner protector frame 18 by concrete, constitutes composite wall, preferably bear the soil into hole end construction surface 1
Body extruding force avoids collapsing, and resistance to compression is durable.Injection slurry is driven away between layer of sand and clay particle in a manner of filling, permeating and is compacted etc.
Moisture and gas, and fill its position, it is anti-that hydrolysis, aquation occur with the water and soil in the soil body respectively by mineral contained in cement
It answers and granulationn etc., suspension colloid and dough is formed, so that soil layer be made to be reinforced.
(2) unscrew anchor bolt 17, T-type expansion bracket 2 is removed one by one, then appeared out into the hole of hole end.
(e) maintenance molding:
(1) side template 28, end template 29 are set up along the boundary line of reinforcing area, taken along the inner wall block-by-block of arc backplate 3
If template, circular template 30 is formed, front apron 31 will be set up between circular template 30 and side template 28, end template 29, so that preceding
Baffle 31 and side template 28, end template 29 form between circular template 30 and pour chamber.
(2) pre-configured C15 plain concrete is injected from pouring top of chamber, until C15 plain concrete slurries are from pouring chamber
Top is overflowed, and then will be poured chamber by installation top template 32 and be bound, to front apron 31, side template 28, end template 29 and ring-type
Template 30 is supported reinforcing with batten respectively, after improving front apron 31, side template 28, end template 29 and the installation of circular template 30
Stability, it is not easy to loosen or disengage, to reduce plain concrete exoserosis, guarantee the Forming Quality and structure of composite wall
Intensity.The plain concrete slurries overflowed from the gap between adjacent forms, between template and baffle are struck off, extravasation is avoided
Plain concrete slurries extrusion die plate under the effect of expanding with heat and contract with cold, causes junction gap to become larger and affect the molding matter of composite wall
Amount, and template, baffle are wrapped up after avoiding the plain concrete grout cures of extravasation and is not easy to the later period and removes.It is torn open after the completion of maintenance
Except each piece of template and front apron 31, composite wall molding, the center of the composite wall has been reserved hole, in order to which shield machine punches, has been exempted from
The operation manually abolished has been gone, risk is reduced, has improved the safety of construction.
T-type expansion bracket and arc protective board group are first dressed up into locating support, then each locating support is joined end to end, forms positioning
Component, is then directed at the center of shield end by positioning member, then adjusts the length of T-type expansion bracket, has adjusted
Arc backplate is fixed after finishing, so that border circular areas made of each arc backplate encloses mutually is fitted with the hole into hole end
Match, to reduce influence when shield construction, reserved hole, on the one hand punched convenient for shield machine, eliminates artificial
On the other hand the operation abolished located hole on integrally-built influence when avoiding the operation to punch again and punching, with
This is arranged around as construction reference center, from center, greatly reduces difficulty of construction, and it is more convenient to construct.
Then in the fixed L-type corner protector frame of four edges of reinforcing area, make the boundary line of L-type corner protector frame and reinforcing area
Between keep at a distance, consequently facilitating concrete wraps up L-type corner protector frame, merges into an organic whole after later period casting concrete, play
Protective effect avoids L-type corner protector frame exposed and influences the stability of entire reinforcement system；Then by freezing pipe from L-type corner protector frame
On fixed jack insertion coolant liquid is injected, when coolant liquid is flowed into hole until be inserted into the soil layer of hole end construction surface
After in the soil layer of end construction surface, underground water and soil sand are frozen into some strength, fluid-tight consolidation by freezing body, preferably plus
Consolidate the soil body of rich Water containing silty and fine sand bed, so that water burst accident, the freezing pipe after freezing occur when preventing shield launching from constructing
It plays a supporting role to L-type corner protector frame, so that L-type corner protector frame is not easy to fall off from construction surface, improves the installation of L-type corner protector frame
Stability afterwards.
Then the support arm on arc backplate is rotated, fixed arm is transferred in accommodate groove through fixed fluting, it then will note
It starches pipe and injects injection slurry, slip casting until being inserted into the soil layer of hole end construction surface from the positioning through hole insertion on fixed arm
Reinforcing body is formed with the soil body of construction surface after liquid solidification, so that Grouting Pipe is not easy to fall off from construction surface, so that fixed arm is more
Hardly possible is detached from L-type corner protector frame, improves being completely embedded property, and fixed arm can not be movable, and support arm also can not be movable, leads to arc backplate
Also can not be movable, it realizes that arc backplate links together with the limitation of L-type corner protector frame, mutually restrains, formation Anti-pressure reinforcing body, surely
It is qualitative good, it is not easy to fall apart, use durable length.By the way of freezing, slip casting combines, can effectively it reinforce rich in pigment fine sand
Percolating water accident occurs when preventing shield from constructing for stratum.
After T-type expansion bracket is removed, then appear out into the hole of hole end, then carry out template and set up, by stabilization zone
Each component in domain encloses, and formation pours chamber, injects C15 plain concrete, and C15 plain concrete melts into being wrapped in each component
One, is closely connected, and each component and pipe depend on carrier as C15 plain concrete, improves the knot after C15 plain concrete solidifies
Structure intensity and shearing strength form composite wall, and compression strength height, good integrity, structural stability are high, effectively strengthen the shield beginning
Originator head, improves the safety of construction.
Present invention process is simple, and difficulty of construction is low, and it is convenient to operate, and construction efficiency is high, and consolidation effect is good, and security performance is high,
It can be adjusted flexibly in work progress, be conducive to improve strengthening quality, be applicable to the shield launching end of different hole sizes, be applicable in
Range is wide.
The above is only specific embodiments of the present invention, but technical characteristic of the invention is not limited thereto.It is any with this hair
Based on bright, to solve essentially identical technical problem, essentially identical technical effect is realized, made simple change, etc.
With replacement or modification etc., all it is covered by among protection scope of the present invention.
Claims (10)
1. a kind of richness Water containing silty and fine sand bed shield launching design reinforcement method, it is characterised in that include the following steps:
(a) preparation of construction: cleaning shield end construction surface goes out the stabilization zone into hole end according to design drawing measuring
Domain, aperture contour line and center spray reinforcing area and aperture contour line into hole end with red paint, in intubation label
Heart position；
(b) centralized positioning:
(1) T-type expansion bracket and arc protective board group are dressed up into locating support, the fixation convex block of one piece of positioning plate one end is snapped into phase
In positioning groove on adjacent positioning plate, each locating support is made to join end to end, forms positioning member；
(2) then by the positioning member by being placed on into the construction surface of hole end, the center of geometry made of enclosing each positioning plate and
It is located in same horizontal line into the center of hole end, the length of T-type expansion bracket is adjusted according to aperture contour line, makes arc backplate position
In the outside of aperture contour line, then mounting plate is temporarily fixed at into the construction surface of hole end in such a way that nailing is fixed；
(c) corner positions:
(1), in the fixed L-type corner protector frame of four edge nailings of reinforcing area, control the distance between L-type corner protector frame and boundary line
System is in 400~600mm；
(2) then freezing pipe is inserted into from the fixed jack on L-type corner protector frame, until being inserted into the soil layer into hole end construction surface
In, coolant liquid is then injected into freezing pipe, until coolant liquid is excessive, blocks the nozzle of freezing pipe；
(d) it reinforces:
(1) rotate the support arm on arc backplate, fixed arm being transferred in accommodate groove through fixed fluting, then by Grouting Pipe from
Positioning through hole insertion on fixed arm injects injection slurry into Grouting Pipe until being inserted into the soil layer of hole end construction surface,
Until injection slurry is excessive, the nozzle of Grouting Pipe is then blocked；
(2) T-type expansion bracket is removed one by one；
(e) maintenance molding:
(1) side template, end template are set up along the boundary line of reinforcing area, set up template, group along the inner wall block-by-block of arc backplate
Circlewise template will set up front apron between circular template and side template, end template so that front apron and side template, end template,
It is formed between circular template and pours chamber；
(2) pre-configured C15 plain concrete is injected from pouring top of chamber, until C15 plain concrete slurries are from pouring top of chamber
It overflows, chamber then will be poured by installation top template and bound, each piece of template and front apron are removed after the completion of maintenance.
2. a kind of rich Water containing silty and fine sand bed shield launching design reinforcement method according to claim 1, it is characterised in that: step
Suddenly locating support includes T-type expansion bracket and arc backplate in (b), and the T-type expansion bracket includes positioning plate, fixed link and loop bar,
In the loop bar, the positioning plate is set to the other end of the fixed link, the positioning plate for one end activity of the fixed link
One end be equipped with fixed convex block, the positioning plate is equipped with positioning groove, and the positioning groove is corresponding with the fixed convex block,
It is fixed between the loop bar and the arc backplate by anchor bolt, the arc backplate is equipped with mounting plate, the installation
Plate is equipped with mounting hole, is connected with support arm on the arc backplate, one end of the support arm is connected with fixed arm, described solid
Fixed arm is equipped with positioning through hole.
3. a kind of rich Water containing silty and fine sand bed shield launching design reinforcement method according to claim 2, it is characterised in that: institute
The one end for stating loop bar is equipped with fixed block, and the fixed block is equipped with fixed counterbore, and the arc backplate is equipped with limit screw hole, institute
Anchor bolt is stated to be set between the limit screw hole and the fixed counterbore.
4. a kind of rich Water containing silty and fine sand bed shield launching design reinforcement method according to claim 1, it is characterised in that: step
Suddenly accommodate groove and fixed jack are respectively equipped in (c) on L-type corner protector frame, the inside of the L-type corner protector frame is equipped with fixed fluting,
The fixed fluting is communicated with the accommodate groove, and the L-type corner protector frame is equipped with set square, and the set square, which is equipped with, to be fixed
Anchor hole.
5. a kind of rich Water containing silty and fine sand bed shield launching design reinforcement method according to claim 1, it is characterised in that: step
Suddenly first reinforcing bar is inserted into Grouting Pipe before slip casting in (d), until being inserted into the soil layer of hole end construction surface, so
Afterwards together by binding reinforcing bars, then into Grouting Pipe injection slurry is injected.
6. a kind of rich Water containing silty and fine sand bed shield launching design reinforcement method according to claim 1, it is characterised in that: step
Suddenly in (d) after blocking Grouting Pipe, steel pipe is plugged in the accommodate groove on L-type corner protector frame, until steel pipe is inserted into hole end
200~300mm in the soil layer of head construction surface, the distance between adjacent steel pipe are 100~200mm, and note is then injected into steel pipe
Slurries block the nozzle of steel pipe until injection slurry is excessive.
7. a kind of rich Water containing silty and fine sand bed shield launching design reinforcement method according to claim 1, it is characterised in that: step
Suddenly in (e) after binding, reinforcing is supported with batten respectively to front apron, side template, end template and circular template.
8. a kind of rich Water containing silty and fine sand bed shield launching design reinforcement method according to claim 1, it is characterised in that: step
Suddenly in (e) after binding, the plain concrete slurries overflowed from the gap between adjacent forms, between template and baffle are scraped
It removes.
9. a kind of rich Water containing silty and fine sand bed shield launching design reinforcement method according to claim 1, it is characterised in that: step
Suddenly the coolant liquid in (c) is the hypothermic saline between -20 DEG C~-10 DEG C.
10. a kind of rich Water containing silty and fine sand bed shield launching design reinforcement method according to claim 1, it is characterised in that:
Injection slurry in step (d) is cement-silicate dual slurry.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910213173.4A CN109989759B (en) | 2019-03-20 | 2019-03-20 | Shield initial design and reinforcement method for fine sand layer rich in water powder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910213173.4A CN109989759B (en) | 2019-03-20 | 2019-03-20 | Shield initial design and reinforcement method for fine sand layer rich in water powder |
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| CN109989759A true CN109989759A (en) | 2019-07-09 |
| CN109989759B CN109989759B (en) | 2020-08-07 |
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| CN107489427A (en) * | 2017-10-10 | 2017-12-19 | 南昌轨道交通集团有限公司地铁项目管理分公司 | A kind of water-rich sand layer shield launching termination ruggedized construction and its construction method |
| CN107605498A (en) * | 2017-11-02 | 2018-01-19 | 中铁十局集团有限公司 | Rich water sand-pebble layer shield tunnel termination horizontal grouting ruggedized construction construction method |
| CN206957717U (en) * | 2017-04-18 | 2018-02-02 | 中铁十二局集团有限公司 | Arrival receives miniature steel bushing |
| CN107676097A (en) * | 2017-08-27 | 2018-02-09 | 中铁十二局集团有限公司 | A kind of high hydraulic pressure soft soil layer HFE composite shield originating methods |
| KR101933614B1 (en) * | 2018-01-02 | 2018-12-28 | 이평우 | Tunnel ground pre-reinforcement method using the steel pipe and Tunnel ground pre-reinforcement type tunnel excavation method |
| CN109356598A (en) * | 2018-12-08 | 2019-02-19 | 成都鑫都建设工程有限公司 | A kind of shield machine reaction frame in constructing tunnel |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206957717U (en) * | 2017-04-18 | 2018-02-02 | 中铁十二局集团有限公司 | Arrival receives miniature steel bushing |
| CN107676097A (en) * | 2017-08-27 | 2018-02-09 | 中铁十二局集团有限公司 | A kind of high hydraulic pressure soft soil layer HFE composite shield originating methods |
| CN107489427A (en) * | 2017-10-10 | 2017-12-19 | 南昌轨道交通集团有限公司地铁项目管理分公司 | A kind of water-rich sand layer shield launching termination ruggedized construction and its construction method |
| CN107605498A (en) * | 2017-11-02 | 2018-01-19 | 中铁十局集团有限公司 | Rich water sand-pebble layer shield tunnel termination horizontal grouting ruggedized construction construction method |
| KR101933614B1 (en) * | 2018-01-02 | 2018-12-28 | 이평우 | Tunnel ground pre-reinforcement method using the steel pipe and Tunnel ground pre-reinforcement type tunnel excavation method |
| CN109356598A (en) * | 2018-12-08 | 2019-02-19 | 成都鑫都建设工程有限公司 | A kind of shield machine reaction frame in constructing tunnel |
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| CN109989759B (en) | 2020-08-07 |
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