CN104481548B - A kind of shield tunnel construction face void handling method - Google Patents
A kind of shield tunnel construction face void handling method Download PDFInfo
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- CN104481548B CN104481548B CN201410609495.8A CN201410609495A CN104481548B CN 104481548 B CN104481548 B CN 104481548B CN 201410609495 A CN201410609495 A CN 201410609495A CN 104481548 B CN104481548 B CN 104481548B
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- 238000000034 method Methods 0.000 title claims abstract description 73
- 238000010276 construction Methods 0.000 title claims abstract description 34
- 239000011800 void material Substances 0.000 title claims abstract description 20
- 238000007569 slipcasting Methods 0.000 claims abstract description 126
- 210000004911 serous fluid Anatomy 0.000 claims abstract description 82
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000004568 cement Substances 0.000 claims abstract description 36
- 239000004576 sand Substances 0.000 claims abstract description 34
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 30
- 239000000440 bentonite Substances 0.000 claims abstract description 30
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000010881 fly ash Substances 0.000 claims abstract description 28
- 239000011083 cement mortar Substances 0.000 claims abstract description 20
- 229940092782 bentonite Drugs 0.000 claims description 28
- 239000000203 mixture Substances 0.000 claims description 27
- 238000002347 injection Methods 0.000 claims description 20
- 239000007924 injection Substances 0.000 claims description 20
- 239000002689 soil Substances 0.000 claims description 16
- 239000002002 slurry Substances 0.000 claims description 15
- 230000001360 synchronised effect Effects 0.000 claims description 14
- 238000012545 processing Methods 0.000 claims description 11
- 238000004891 communication Methods 0.000 claims description 9
- 229920002635 polyurethane Polymers 0.000 claims description 6
- 239000004814 polyurethane Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 238000006386 neutralization reaction Methods 0.000 claims description 5
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 claims description 3
- 229940080314 sodium bentonite Drugs 0.000 claims description 3
- 229910000280 sodium bentonite Inorganic materials 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 5
- 238000005728 strengthening Methods 0.000 abstract description 5
- 238000007596 consolidation process Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 230000003014 reinforcing effect Effects 0.000 description 6
- 229920000742 Cotton Polymers 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000001914 calming effect Effects 0.000 description 1
- 235000019994 cava Nutrition 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 210000005239 tubule Anatomy 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
- E21D9/08—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a kind of shield tunnel construction face void handling method, comprise step: one, slip casting for the first time: adopt filling system and inject the first cement mortar by Tu Cang to empty bottom from top to bottom; The first grouting serous fluid is made into by weight 45～55 ︰ 45～55 ︰ 180～220 ︰ 540～660 ︰ 360～440 by cement, bentonite, flyash, sand and water; Two, slip casting for the second time: adopt filling system to inject the second cement mortar to middle part, cavity; The second cement mortar is made into by weight 90～110 ︰ 68～82 ︰ 200～280 ︰ 540～660 ︰ 420～500 by cement, bentonite, flyash, sand and water; Three, slip casting for the third time: adopt filling system to empty top injected water mud. Step of the present invention is simple, reasonable in design, easy and simple to handle and input cost is low, result of use is good, can solve the various problems that traditional grouting strengthening method exists.
Description
Technical field
The invention belongs to shield tunnel construction technology field, especially relate to a kind of shield tunnel construction face void handling method.
Background technology
Shield method is the Fully-mechanized construction method of the one of modern constructing tunnel, and its plant equipment mainly using is shield machine 2. As shown in Fig. 1-1, Fig. 1-2, in shield-tunneling construction process, when shield machine 2 is calmed the anger to tool changing operation, due to outside face is exposed to for a long time, tunnel tunnel face top easily occurs that large volume caves in and form cavity 1. Along with shield machine cutter change carry out, the open-assembly time in cavity, face top 1 is longer, face is unstable, and, As time goes on development gradually of cavity 1, can cause subsiding of ground then, affects the safety of Adjacent Buildings, structures etc., also can threaten to the operating personnel's personal safety in tool changing just, cause the tool changing operating personnel that calms the anger to be difficult to by the original plan complete the cutter changing that all need to change.
Traditional void handling method is, by the built-in Grouting Pipe of shield machine, the soft soil body in front is carried out to grouting and reinforcing, to improve the intensity of the front soil body, avoids face further to cave in. But there is following defect in above-mentioned traditional grouting strengthening method: the first, grouting consolidation effect is not good; The second,, reinforcing scope can not cover whole cavity; If three, the cavity long period exposes, still can continue to expand; Four, soil strength skewness after grouting and reinforcing, as face is still exposed in air, face has the possibility that continues to cave in.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned deficiency of the prior art, a kind of shield tunnel construction face void handling method is provided, its step is simple, reasonable in design, easy and simple to handle and input cost is low, result of use is good, can effectively solve the grouting consolidation effect that traditional grouting strengthening method exists not good, can not carry out to face cavity the problems such as effectively processing.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of shield tunnel construction face void handling method, the face of processing cavity for being positioned at the cavity on top, cutterhead front of shield machine, it is characterized in that the method comprises the following steps:
Step 1, slip casting for the first time: adopt the filling system of shield machine, and inject the first grouting serous fluid by the Tu Cang of shield machine to empty bottom; In slip casting process for the first time, described native storehouse internal pressure is controlled between 1.5bar～3.5bar;
When slip casting for the first time, in described native storehouse, inject described the first grouting serous fluid from top to bottom; After slip casting completes for the first time, the inside upper part of described Tu Cang is cement mortar filled section, and the bottom level of described cement mortar filled section is lower than empty bottom level;
By cement, bentonite, flyash, sand and water, ((((the even mixture of ratio of 540～660) ︰ (360～440) forms 180～220) ︰ 45～55) ︰ 45～55) ︰ described the first grouting serous fluid by weight;
Step 2, slip casting for the second time: adopt described filling system, inject the second grouting serous fluid to middle part, cavity;
Before slip casting, first pass through the first Grouting Pipe by described filling system and empty internal communication for the second time; By cement, bentonite, flyash, sand and water, ((((the even mixture of ratio of 540～660) ︰ (420～500) forms 200～280) ︰ 68～82) ︰ 90～110) ︰ described the second grouting serous fluid by weight;
Step 3, slip casting for the third time: adopt described filling system, to empty top injected water mud;
Before slip casting, first by the second Grouting Pipe, described filling system is communicated with empty top for the third time.
Above-mentioned a kind of shield tunnel construction face void handling method, is characterized in that: the filling system of described shield machine comprises synchronous grouting system and secondary injection pulp grinder; While carrying out carrying out slip casting for the second time in slip casting for the first time and step 2 in step 1, described filling system is the synchronous grouting system of shield machine; Before slip casting, first pass through the first Grouting Pipe by described synchronous grouting system and empty internal communication for the second time; While carrying out slip casting for the third time in step 3, the secondary injection pulp grinder that described filling system is shield machine, before slip casting, is first communicated with described secondary injection pulp grinder by the second Grouting Pipe for the third time with empty top.
Above-mentioned a kind of shield tunnel construction face void handling method, it is characterized in that: after in step 3, slip casting completes for the third time, after the equal initial set of institute's cement injection in institute's note the second grouting serous fluid and step 3 in institute's note the first grouting serous fluid, step 2 in step 1, the need on cutterhead are changed to cutter and change.
Above-mentioned a kind of shield tunnel construction face void handling method, is characterized in that: before carrying out slip casting for the first time in step 1, first the filling system of shield machine is connected to the sidewall that described native bulkhead is described Tu Cang with injected hole set on native bulkhead; In step 1 when slip casting for the first time, in step 2, when slip casting for the second time and in step 3 when slip casting for the third time, described filling system all carries out slip casting by the injected hole on described native bulkhead.
Above-mentioned a kind of shield tunnel construction face void handling method, is characterized in that: on described native bulkhead, the quantity of set injected hole is multiple; Multiple described injected holes comprise be laid in the 3rd injected hole of native bulkhead center upper portion, the first injected hole that is laid in respectively the left and right sides, native bulkhead middle part and the 5th injected hole, at the second injected hole between the first injected hole and the 3rd injected hole, the 4th injected hole between the 3rd injected hole and the 5th injected hole, described the first injected hole, the second injected hole, the 3rd injected hole, the 4th injected hole and the 5th injected hole are along the circumferential direction laid;
Described the 4th injected hole is communicated with empty top by the second Grouting Pipe, blast pipe is housed on described the first injected hole and it is communicated with empty top by blast pipe, described the first injected hole is steam vent, and described the second injected hole is by the first Grouting Pipe and empty internal communication; Described the 4th injected hole, the second injected hole and the 3rd injected hole are all connected with the filling system of shield machine;
While carrying out slip casting for the first time in step 1, inject the first grouting serous fluid from the 3rd injected hole; Inject the first grouting serous fluid process, carry out exhaust by blast pipe;
While carrying out slip casting for the second time in step 2, inject the second grouting serous fluid by the second injected hole; Inject the second grouting serous fluid process, carry out exhaust by blast pipe;
While carrying out slip casting for the third time in step 3, by the 4th injected hole injected water mud; In injected water mud process, carry out exhaust by blast pipe.
Above-mentioned a kind of shield tunnel construction face void handling method, is characterized in that: the height that described the first Grouting Pipe upper end exceeds cutterhead is H1, wherein H1=450mm～550mm; On described the 5th injected hole, the sighting tube that the slip casting situation of the first Grouting Pipe is observed is installed, described the 5th injected hole is peephole; The height that described sighting tube upper end exceeds cutterhead is H2, wherein H2=250mm～350mm;
While carrying out slip casting for the second time in step 2, in the time reserving the second grouting serous fluid in sighting tube, stop slip casting.
Above-mentioned a kind of shield tunnel construction face void handling method, is characterized in that: the height of the filled section of cement mortar described in step 1 is the half of described Tu Cang height; After in step 2, slip casting completes for the second time, the liquid level of inner second grouting serous fluid of filling in described cavity exceeds cutterhead top 250mm～350mm.
Above-mentioned a kind of shield tunnel construction face void handling method, is characterized in that: by cement, bentonite, flyash, sand and water, ((((the even mixture of ratio of 580～620) ︰ (390～410) forms 195～205) ︰ 48～52) ︰ 48～52) ︰ the first grouting serous fluid described in step 1 by weight; By cement, bentonite, flyash, sand and water, ((((the even mixture of ratio of 580～620) ︰ (450～470) forms 235～245) ︰ 72～78) ︰ 95～105) ︰ the second grouting serous fluid described in step 2 by weight.
Above-mentioned a kind of shield tunnel construction face void handling method, is characterized in that: the bentonite in the first grouting serous fluid described in step 1 and described the second grouting serous fluid is sodium bentonite; Sand in the first grouting serous fluid described in step 1 and described the second grouting serous fluid is fine sand; In step 1, in slip casting process for the first time, described native storehouse internal pressure is controlled between 2.5bar～3.4bar.
Above-mentioned a kind of shield tunnel construction face void handling method, is characterized in that: the shield body of described shield machine is divided into anterior shield, middle shield and shield tail from front to back, and described anterior shield is otch ring; Before carrying out slip casting for the first time in step 1, first with sponge and/or cotton yarn, shutoff is carried out in the gap between cutterhead and otch ring and between otch ring and the outside soil body; In step 1 in slip casting process for the first time, in step 2 in the neutralization procedure three of slip casting process for the second time in slip casting process for the third time, all by liquid-injection equipment at middle shield present position place's water filling soluble polyurethane.
The present invention compared with prior art has the following advantages:
1, method step is simple, input cost is low and operation, easy construction, and it is convenient to realize.
2, reasonable in design, after injected hole on native bulkhead is communicated with the cavity, front of cutterhead, by first cavity being carried out to the slip casting of different materials three times to rear point, wherein slip casting is for the first time by the synchronous grouting system of shield machine, inject the first grouting serous fluid to cavity, grouting amount is considered by the half storehouse soil of residue in native storehouse; Slip casting for the second time, by the synchronous grouting system of shield machine, is injected the second grouting serous fluid to cavity, be injected into 30cm position, cutterhead top; By the secondary injection pulp grinder of shield machine, cement mortar is annotated to empty top for the third time. Three slip casting is all aided with air venting, controls the stable of native storehouse internal pressure. Meanwhile, in order to prevent that slurries from wrapping shield body, at middle shield place's water filling soluble polyurethane. Until carrying out again normal pressure tool changing after mortar slurries in Tu Cang and cavity.
Meanwhile, three slip casting slurry constituents used is reasonable in design, and wherein in the first grouting serous fluid, cement content is relatively low, can not only carry out to a certain degree backfill to Tu Cang, and can carry out effective filling to bottom, cavity, and later stage Tu Cang cleaning is simultaneously convenient; In the second grouting serous fluid, cement content is relatively high, and after filling, the adhesion strength of the packed layer that forms is large, can meet the demand of cavity middle part filling; And adopt cement mortar to carry out filling to empty top when slip casting for the third time, cement mortar is compared with cement mortar, finer and smoother and its associativity is good, the effectively combination of packed layer that the empty top soil body and institute's injection slurry are formed, avoid face to expose for a long time, and can effectively prevent that cavity continuation from expanding. Thereby, adopt three kinds of different materials to carry out filling to cavity, can give full play to three kinds of materials advantage separately, and can carry out fast cavity, effectively process, grouting consolidation effect is good.
3, slip casting is convenient, the synchronous grouting system and the secondary injection pulp grinder that adopt shield machine to carry just can complete slip casting, and carry out slip casting by the injected hole on native bulkhead, only need on injected hole, connect corresponding pipeline, without other structure of shield machine is adjusted, thereby practical operation is easy, equipment investment cost is lower and the early-stage preparations time is short, it is convenient to realize.
4, cavity the processing time short, do not affect the construction period.
5, safety coefficient when tool changing is carried out after finishing dealing with in cavity is very high, can effectively ensure tool changing work progress fast, effectively carry out, and the risk of tool changing with pressure has been avoided in tool changing under condition of normal pressure.
6, result of use is good and practical value is high, and grouting consolidation effect is good, the method that adopts empty slip casting to fill, and the initial stage that forms in cavity just can be sealed Tu Cang and cavity easy, fast, avoids face to expose for a long time, makes face reach as early as possible stable. Meanwhile, reinforcing scope can cover whole cavity, and after grouting and reinforcing, soil strength is evenly distributed, and what face continued to cave in may be less. Thereby, can effectively solve that the grouting consolidation effect that traditional grouting strengthening method exists is not good, reinforcing scope can not cover whole cavity, reinforce after soil strength skewness, face exist and continue the problems such as hidden danger of caving in.
In sum, step of the present invention is simple, reasonable in design, easy and simple to handle and input cost is low, result of use is good, can effectively solve the grouting consolidation effect that traditional grouting strengthening method exists not good, can not carry out to face cavity the problems such as effectively processing.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Brief description of the drawings
The structure in face cavity and position view when Fig. 1-1 is shield-tunneling construction.
Fig. 1-2 is the right view of Fig. 1-1.
Fig. 2 is method flow block diagram of the present invention.
Fig. 3 is the pipeline connection status schematic diagram of injected hole on the present invention's soil bulkhead.
Description of reference numerals:
1-cavity; 2-shield machine; 2-1-cutterhead;
3-native bulkhead; 4-1-the first injected hole; 4-2-the second injected hole;
4-3-three injected hole; 4-4-four injected hole; 4-5-five injected hole;
The 5-the first Grouting Pipe; The 6-the second Grouting Pipe; 7-blast pipe;
8-sighting tube;
Detailed description of the invention
Embodiment 1
A kind of shield tunnel construction face void handling method as shown in Figure 2, the face of processing cavity for being positioned at the cavity 1 on top, cutterhead 2-1 front of shield machine 2, comprise the following steps:
Step 1, slip casting for the first time: adopt the filling system of shield machine 2, and inject the first grouting serous fluid by the Tu Cang of shield machine 2 to empty 1 bottom; In slip casting process for the first time, described native storehouse internal pressure is controlled between 1.5bar～3.5bar.
When slip casting for the first time, in described native storehouse, inject described the first grouting serous fluid from top to bottom; After slip casting completes for the first time, the inside upper part of described Tu Cang is cement mortar filled section, and the bottom level of described cement mortar filled section is lower than the bottom level in cavity 1.
By cement, bentonite, flyash, sand and water, ((((the even mixture of ratio of 540～660) ︰ (360～440) forms 180～220) ︰ 45～55) ︰ 45～55) ︰ described the first grouting serous fluid by weight.
Step 2, slip casting for the second time: adopt described filling system, inject the second grouting serous fluid to empty 1 middle part.
Before slip casting, first pass through the first Grouting Pipe 5 by described filling system and empty 1 internal communication for the second time; By cement, bentonite, flyash, sand and water, ((((the even mixture of ratio of 540～660) ︰ (420～500) forms 200～280) ︰ 68～82) ︰ 90～110) ︰ described the second grouting serous fluid by weight.
Step 3, slip casting for the third time: adopt described filling system, to empty 1 top injected water mud.
Before slip casting, first by the second Grouting Pipe 6, described filling system is communicated with empty 1 top for the third time.
In the present embodiment, the filling system of described shield machine 2 comprises synchronous grouting system and secondary injection pulp grinder. While carrying out carrying out slip casting for the second time in slip casting for the first time and step 2 in step 1, described filling system is the synchronous grouting system of shield machine 2; Before slip casting, first pass through the first Grouting Pipe 5 by described synchronous grouting system and empty 1 internal communication for the second time; While carrying out slip casting for the third time in step 3, described filling system is the secondary injection pulp grinder of shield machine 2, before slip casting, first by the second Grouting Pipe 6, described secondary injection pulp grinder is communicated with empty 1 top for the third time.
When practice of construction, preferably by cement, bentonite, flyash, sand and water, ((((the even mixture of ratio of 580～620) ︰ (390～410) forms 195～205) ︰ 48～52) ︰ 48～52) ︰ the first grouting serous fluid described in step 1 by weight; Preferably by cement, bentonite, flyash, sand and water, ((((the even mixture of ratio of 580～620) ︰ (450～470) forms 235～245) ︰ 72～78) ︰ 95～105) ︰ the second grouting serous fluid described in step 2 by weight.
In the present embodiment, described the first grouting serous fluid by cement, bentonite, flyash, Sha Heshui by weight the even mixture of ratio of 50 ︰ 50 ︰ 200 ︰ 600 ︰ 400 form; The second grouting serous fluid described in step 2 is preferably formed by weight the even mixture of ratio of 100 ︰ 75 ︰ 240 ︰ 600 ︰ 460 by cement, bentonite, flyash, sand and water.
In practice of construction process, can according to specific needs, the proportioning of each component in described the first grouting serous fluid and described the second grouting serous fluid be adjusted accordingly.
In the present embodiment, cement mortar described in step 3 is formed by weight the even mixture of ratio of 1 ︰ 1 by cement and water.
In the present embodiment, the bentonite in the first grouting serous fluid described in step 1 and described the second grouting serous fluid is sodium bentonite. Sand in the first grouting serous fluid described in step 1 and described the second grouting serous fluid is fine sand.
In the present embodiment, in step 1, in slip casting process for the first time, described native storehouse internal pressure is controlled between 2.5bar～3.4bar.
And, in step 2, in the neutralization procedure three of slip casting process for the second time in slip casting process for the third time, described native storehouse internal pressure is all controlled between 2.5bar～3.4bar;
In the present embodiment, after slip casting completes for the third time in step 3, after the equal initial set of institute's cement injection in institute's note the second grouting serous fluid and step 3 in institute's note the first grouting serous fluid, step 2 in step 1, the need on cutterhead 2-1 are changed to cutter and change.
When reality is changed need replacing cutter, adopt normal pressure cutter replacing method. When actual replacing, employing is beaten boring tool the cement bonded sand lumps being set in described native storehouse is carried out to labor cleaning, and in cement bonded sand lumps scale removal process, synchronously need is changed to cutter and change.
Before carrying out slip casting for the first time in step 1, first the filling system of shield machine 2 is connected to the sidewall that described native bulkhead 3 is described Tu Cang with injected hole set on native bulkhead 3. In step 1 when slip casting for the first time, in step 2, when slip casting for the second time and in step 3 when slip casting for the third time, described filling system all carries out slip casting by the injected hole on described native bulkhead. In the present embodiment, described native bulkhead 3 is circular.
In the present embodiment, on described native bulkhead 3, the quantity of set injected hole is multiple; Multiple described injected holes comprise be laid in the 3rd injected hole 4-3 of native bulkhead 3 center upper portion, the first injected hole 4-1 that is laid in respectively native bulkhead 3 left and right sides, middle part and the 5th injected hole 4-5, at the second injected hole 4-2 between the first injected hole 4-1 and the 3rd injected hole 4-3, the 4th injected hole 4-4 between the 3rd injected hole 4-3 and the 5th injected hole 4-5, described the first injected hole 4-1, the second injected hole 4-2, the 3rd injected hole 4-3, the 4th injected hole 4-4 and the 5th injected hole 4-5 along the circumferential direction lay.
Described the 4th injected hole 4-4 is communicated with empty 1 top by the second Grouting Pipe 6, blast pipe 7 and its are housed on described the first injected hole 4-1 to be communicated with empty 1 top by blast pipe 7, described the first injected hole 4-1 is steam vent, and described the second injected hole 4-2 is by the first Grouting Pipe 5 and empty 1 internal communication. Described the 4th injected hole 4-4, the second injected hole 4-2 are all connected with the filling system of shield machine 2 with the 3rd injected hole 4-3.
While carrying out slip casting for the first time in step 1, inject the first grouting serous fluid from the 3rd injected hole 4-3; Inject the first grouting serous fluid process, carry out exhaust by blast pipe 7.
While carrying out slip casting for the second time in step 2, inject the second grouting serous fluid by the second injected hole 4-2; Inject the second grouting serous fluid process, carry out exhaust by blast pipe 7.
While carrying out slip casting for the third time in step 3, by the 4th injected hole 4-4 injected water mud; In injected water mud process, carry out exhaust by blast pipe 7.
In the present embodiment, on described the first injected hole 4-1, the second injected hole 4-2, the 3rd injected hole 4-3, the 4th injected hole 4-4 and the 5th injected hole 4-5, ball valve is all installed.
And, described the first injected hole 4-1, the second injected hole 4-2, the 3rd injected hole 4-3, the 4th injected hole 4-4 and the 5th injected hole 4-5 be laid in respectively 9 o'clock on native bulkhead 3,10 o'clock, 12 o'clock, 2 o'clock and 3 o'clock orientation.
In the present embodiment, the height of the filled section of cement mortar described in step 1 is the half of described Tu Cang height.
After in step 2, slip casting completes for the second time, the liquid level of described empty 1 inner second grouting serous fluid of filling exceeds cutterhead 2-1 top 250mm～350mm.
Correspondingly, the height that described the first Grouting Pipe 5 upper ends exceed cutterhead 2-1 is H1, wherein H1=450mm～550mm; On described the 5th injected hole 4-5, the sighting tube 8 that the slip casting situation of the first Grouting Pipe 5 is observed is installed, described the 5th injected hole 4-5 is peephole; The height that described sighting tube 8 upper ends exceed cutterhead 2-1 is H2, wherein H2=250mm～350mm.
While carrying out slip casting for the second time in step 2, in the time reserving the second grouting serous fluid in sighting tube 8, stop slip casting.
In the present embodiment, H1=500mm, H2=300mm. Thereby after in step 2, slip casting completes for the second time, the liquid level of described empty 1 inner second grouting serous fluid of filling exceeds cutterhead 2-1 top 300mm.
When practice of construction, can according to specific needs, the value size of H1 and H2 be adjusted accordingly.
In the present embodiment, described the second Grouting Pipe 6, blast pipe 7, the first Grouting Pipe 5 and sighting tube 8 are rubber tube. Described the second Grouting Pipe 6 and all long tubules of blast pipe 7, described the first Grouting Pipe 5 and sighting tube 8 are short and thick pipe.
In the present embodiment, the shield body of described shield machine 2 is divided into anterior shield, middle shield and shield tail from front to back, and described anterior shield is otch ring.
Before carrying out slip casting for the first time in step 1, first with sponge and/or cotton yarn, shutoff is carried out in the gap between cutterhead and otch ring and between otch ring and the outside soil body; In step 1 in slip casting process for the first time, in step 2 in the neutralization procedure three of slip casting process for the second time in slip casting process for the third time, all by liquid-injection equipment at middle shield present position place's water filling soluble polyurethane.
In the present embodiment, gap between described cutterhead and otch ring and between otch ring and the outside soil body is circular gap, when shutoff is carried out in gap between cutterhead and otch ring and between otch ring and the outside soil body, all shutoff is carried out in the semicircle gap on top.
When practice of construction, adopt before the present invention processes cavity 1, first warehouse entry with pressure of staff, and with cotton yarn by the gap jam-pack existing on girff that fills on cutterhead 2-1; Afterwards, by the gap jam-pack between the cutterhead in 3 o'clock～9 o'clock orientation (being upper semi-circle) and otch ring and between otch ring and the outside soil body, prevent that slurries from flowing to Tu Cang by outside and preventing that slurries from wrapping up in attached shield body with sponge and cotton yarn. Then, staff's warehouse entry with pressure carries out native bulkhead injected hole pipeline and connects, and mainly comprises the connection of the second Grouting Pipe 6, blast pipe 7, the first Grouting Pipe 5 and sighting tube 8, refers to Fig. 3. Meanwhile, also need described filling system to be connected with the injected hole on native bulkhead; Pipeline connects complete, check all ready after, staff delivers from godown.
Wherein, on the 4th injected hole 4-4, connect the top of the second Grouting Pipe 6 to cavity 1, for noting neat slurry; On the first injected hole 4-1, run in tracheae 7 to 1 top, cavity, carry out exhaust for slip casting process; On the second injected hole 4-2, connect the first Grouting Pipe 5, for note the second grouting serous fluid; On the 5th injected hole 4-5, connect sighting tube 8, for detection of the slip casting situation of the first Grouting Pipe 5; On the 3rd injected hole 4-3, do not take over, for note the first grouting serous fluid.
Pipeline connects complete, while carrying out slip casting for the first time, use synchronous grouting system, described the first grouting serous fluid is annotated in described native storehouse from the 3rd injected hole 4-3, open the ball valve filling on the first injected hole 4-1 slowly to discharge air simultaneously, storehouse in described native storehouse is pressed and remained on 2.5bar～3.4bar, after note 18 side's the first grouting serous fluids (considering by the half storehouse soil of residue in described native storehouse), stop slip casting; Afterwards, use described synchronous grouting system, described the second grouting serous fluid, from the second injected hole 4-2 to cavity 1 interior filling, is opened to the ball valve filling on the first injected hole 4-1 slowly to discharge air simultaneously, when the sighting tube that connects 8 on the 5th injected hole 4-5 flows out after slurries, stop slip casting; Then, use secondary injection pulp grinder from the 4th injected hole 4-4 to cavity 1 interior filling, is opened the ball valve filling on the first injected hole 4-1 slowly to discharge air by cement mortar simultaneously, until the tracheae 7 that runs on the first injected hole 4-1 flows out after slurries, stops slip casting.
Simultaneously, in step 1 in slip casting process for the first time, in step 2 in the neutralization procedure three of slip casting process for the second time in slip casting process for the third time, all by liquid-injection equipment at middle shield present position place's water filling soluble polyurethane, specifically, at the external side water filling of described shield soluble polyurethane, prevent that in slip casting for the first time, for the second time slip casting and slip casting process for the third time, institute's injection slurry wraps shield body.
Thereby while calming the anger tool changing, adopt method of the present invention, to inject the mode of slurries (specifically comprising the first grouting serous fluid, the second grouting serous fluid and cement mortar), the large volume cavity 1 that backfill face top occurs, and after the first noted grouting serous fluid, the second grouting serous fluid and cement mortar all solidify, start normal pressure tool changing.
Embodiment 2
In the present embodiment, as different from Example 1: the first grouting serous fluid described in step 1 is formed by weight the even mixture of ratio of 48 ︰ 52 ︰ 195 ︰ 580 ︰ 410 by cement, bentonite, flyash, sand and water; The second grouting serous fluid described in step 2 is formed by weight the even mixture of ratio of 95 ︰ 78 ︰ 235 ︰ 580 ︰ 470 by cement, bentonite, flyash, sand and water.
In the present embodiment, the work progress of all the other steps is all identical with embodiment 1.
Embodiment 3
In the present embodiment, as different from Example 1: the first grouting serous fluid described in step 1 is formed by weight the even mixture of ratio of 52 ︰ 48 ︰ 205 ︰ 580 ︰ 390 by cement, bentonite, flyash, sand and water; The second grouting serous fluid described in step 2 is formed by weight the even mixture of ratio of 105 ︰ 72 ︰ 245 ︰ 580 ︰ 450 by cement, bentonite, flyash, sand and water.
In the present embodiment, the work progress of all the other steps is all identical with embodiment 1.
Embodiment 4
In the present embodiment, as different from Example 1: the first grouting serous fluid described in step 1 is formed by weight the even mixture of ratio of 51 ︰ 49 ︰ 205 ︰ 620 ︰ 400 by cement, bentonite, flyash, sand and water; The second grouting serous fluid described in step 2 is formed by weight the even mixture of ratio of 105 ︰ 72 ︰ 245 ︰ 580 ︰ 450 by cement, bentonite, flyash, sand and water.
In the present embodiment, the work progress of all the other steps is all identical with embodiment 1.
Embodiment 5
In the present embodiment, as different from Example 1: the first grouting serous fluid described in step 1 is formed by weight the even mixture of ratio of 45 ︰ 55 ︰ 195 ︰ 660 ︰ 360 by cement, bentonite, flyash, sand and water; The second grouting serous fluid described in step 2 is formed by weight the even mixture of ratio of 90 ︰ 82 ︰ 200 ︰ 650 ︰ 420 by cement, bentonite, flyash, sand and water.
In the present embodiment, the work progress of all the other steps is all identical with embodiment 1.
Embodiment 6
In the present embodiment, as different from Example 1: the first grouting serous fluid described in step 1 is formed by weight the even mixture of ratio of 55 ︰ 45 ︰ 180 ︰ 540 ︰ 440 by cement, bentonite, flyash, sand and water; The second grouting serous fluid described in step 2 is formed by weight the even mixture of ratio of 110 ︰ 68 ︰ 280 ︰ 660 ︰ 490 by cement, bentonite, flyash, sand and water.
In the present embodiment, the work progress of all the other steps is all identical with embodiment 1.
Embodiment 7
In the present embodiment, as different from Example 1: the first grouting serous fluid described in step 1 is formed by weight the even mixture of ratio of 55 ︰ 45 ︰ 220 ︰ 650 ︰ 370 by cement, bentonite, flyash, sand and water; The second grouting serous fluid described in step 2 is formed by weight the even mixture of ratio of 108 ︰ 70 ︰ 270 ︰ 540 ︰ 430 by cement, bentonite, flyash, sand and water.
In the present embodiment, the work progress of all the other steps is all identical with embodiment 1.
The above; it is only preferred embodiment of the present invention; not the present invention is imposed any restrictions, every any simple modification of above embodiment being done according to the technology of the present invention essence, change and equivalent structure change, and all still belong in the protection domain of technical solution of the present invention.
Claims (8)
1. a shield tunnel construction face void handling method, the face of processing cavity be positionIn the cavity (1) on cutterhead (2-1) top, front of shield machine (2), it is characterized in that the methodComprise the following steps:
Step 1, slip casting for the first time: adopt the filling system of shield machine (2), and pass through shield machine(2) Tu Cang injects the first grouting serous fluid to (1) bottom, cavity; In slip casting process for the first time, willDescribed native storehouse internal pressure is controlled between 1.5bar～3.5bar;
When slip casting for the first time, in described native storehouse, inject described the first grouting serous fluid from top to bottom; FirstAfter inferior slip casting completes, the inside upper part of described Tu Cang is cement mortar filled section, and described cement mortar is filled outThe bottom level of the section of filling is lower than the bottom level in cavity (1);
Described the first grouting serous fluid by cement, bentonite, flyash, sand and water by weight (45～55) ︰ (45～55) ︰ (180～220) ︰ (ratio of 540～660) ︰ (360～440)Evenly mixture forms;
Step 2, slip casting for the second time: adopt described filling system, inject the to middle part, cavity (1)Two grouting serous fluids;
Before slip casting, first pass through the first Grouting Pipe (5) by described filling system and cavity (1) for the second timeInternal communication; Described the second grouting serous fluid by cement, bentonite, flyash, sand and water by weight(90～110)︰(68～82)︰(200～280)︰(540～660)︰(420～500)The even mixture of ratio form;
Step 3, slip casting for the third time: adopt described filling system, to (1) top, cavity injected waterMud;
Before slip casting, first pass through the second Grouting Pipe (6) by described filling system and cavity (1) for the third timeTop is communicated with;
Before carrying out slip casting for the first time in step 1, first by filling system and the Tu Cang of shield machine (2)The upper set injected hole of wall (3) connects, the sidewall that described native bulkhead (3) is described Tu Cang; StepIn rapid one when slip casting for the first time, in step 2 when slip casting for the second time and in step 3 when slip casting for the third time,Described filling system all carries out slip casting by the injected hole on described native bulkhead;
The quantity of the upper set injected hole of described native bulkhead (3) is multiple; Multiple described injected hole bagsDraw together and be laid in the 3rd injected hole (4-3) of native bulkhead (3) center upper portion, be laid in native bulkhead respectively(3) the first injected hole (4-1) and the 5th injected hole (4-5) of the left and right sides, middle part, be positioned at theThe second injected hole (4-2) between one injected hole (4-1) and the 3rd injected hole (4-3), be positioned atThe 4th injected hole (4-4) between the 3rd injected hole (4-3) and the 5th injected hole (4-5), instituteState the first injected hole (4-1), the second injected hole (4-2), the 3rd injected hole (4-3), the 4thInjected hole (4-4) and the 5th injected hole (4-5) are along the circumferential direction laid;
Described the 4th injected hole (4-4) is communicated with (1) top, cavity by the second Grouting Pipe (6),Blast pipe (7) and its are housed by blast pipe (7) and cavity on described the first injected hole (4-1)(1) top is communicated with, and described the first injected hole (4-1) is steam vent, described the second injected hole (4-2)By the first Grouting Pipe (5) and cavity (1) internal communication; Described the 4th injected hole (4-4),The second injected hole (4-2) and the 3rd injected hole (4-3) all connect with the filling system of shield machine (2)Connect;
While carrying out slip casting for the first time in step 1, inject the first slip casting slurry from the 3rd injected hole (4-3)Liquid; Inject the first grouting serous fluid process, carry out exhaust by blast pipe (7);
While carrying out slip casting for the second time in step 2, inject the second slip casting by the second injected hole (4-2)Slurries; Inject the second grouting serous fluid process, carry out exhaust by blast pipe (7);
While carrying out slip casting for the third time in step 3, by the 4th injected hole (4-4) injected water mud;In injected water mud process, carry out exhaust by blast pipe (7).
2. according to a kind of shield tunnel construction face void handling method claimed in claim 1,It is characterized in that: the filling system of described shield machine (2) comprises synchronous grouting system and secondary groutingMachine; While carrying out carrying out slip casting for the second time in slip casting for the first time and step 2 in step 1, described slip casting systemSystem is the synchronous grouting system of shield machine (2); For the second time before slip casting, first by the first slip castingPipe (5) is by described synchronous grouting system and cavity (1) internal communication; In step 3, carry out for the third timeWhen slip casting, described filling system is the secondary injection pulp grinder of shield machine (2), for the third time before slip casting,First by the second Grouting Pipe (6), described secondary injection pulp grinder is communicated with (1) top, cavity.
3. according to face cavity processing side for a kind of shield tunnel construction described in claim 1 or 2Method, is characterized in that: after slip casting completes for the third time in step 3, treat institute's note the first slip casting in step 1In slurries, step 2 in institute's note the second grouting serous fluid and step 3 after the equal initial set of institute's cement injection, tool settingNeed on dish (2-1) are changed cutter and are changed.
4. according to a kind of shield tunnel construction face void handling method claimed in claim 1,It is characterized in that: the height that described the first Grouting Pipe (5) upper end exceeds cutterhead (2-1) is H1, itsMiddle H1=450mm～550mm; On described the 5th injected hole (4-5), be provided with the first Grouting Pipe (5)The sighting tube (8) observed of slip casting situation, described the 5th injected hole (4-5) is peephole;The height that described sighting tube (8) upper end exceeds cutterhead (2-1) is H2, wherein H2=250mm～350mm;
While carrying out slip casting for the second time in step 2, in the time reserving the second grouting serous fluid in sighting tube (8),Stop slip casting.
5. according to face cavity processing side for a kind of shield tunnel construction described in claim 1 or 2Method, is characterized in that: the height of the filled section of cement mortar described in step 1 is described Tu Cang heightHalf; After in step 2, slip casting completes for the second time, described cavity (1) inner second slip casting of fillingThe liquid level of slurries exceeds cutterhead (2-1) top 250mm～350mm.
6. according to face cavity processing side for a kind of shield tunnel construction described in claim 1 or 2Method, is characterized in that: the first grouting serous fluid described in step 1 by cement, bentonite, flyash,Sand and water are by weight (48～52) ︰ (48～52) ︰ (195～205) ︰ (580～620)The even mixture of ratio of ︰ (390～410) forms; The second grouting serous fluid described in step 2 by cement,Bentonite, flyash, sand and water are by weight (95～105) ︰ (72～78) ︰ (235～245)(the even mixture of ratio of 580～620) ︰ (450～470) forms ︰.
7. according to face cavity processing side for a kind of shield tunnel construction described in claim 1 or 2Method, is characterized in that: swollen in the first grouting serous fluid described in step 1 and described the second grouting serous fluidProfit soil is sodium bentonite; In the first grouting serous fluid described in step 1 and described the second grouting serous fluidSand be fine sand; In step 1, in slip casting process for the first time, described native storehouse internal pressure is controlled atBetween 2.5bar～3.4bar.
8. according to face cavity processing side for a kind of shield tunnel construction described in claim 1 or 2Method, is characterized in that: the shield body of described shield machine (2) is divided into anterior shield, middle shield and shield from front to backTail, described anterior shield is otch ring; Before carrying out slip casting for the first time in step 1, first use sponge and/orCotton yarn carries out shutoff to the gap between cutterhead and otch ring and between otch ring and the outside soil body; StepIn rapid one in slip casting process for the first time, in step 2 in the neutralization procedure of slip casting process for the second time three for the third timeIn slip casting process, all by liquid-injection equipment at middle shield present position place's water filling soluble polyurethane.
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| CN105000830B (en) * | 2015-04-22 | 2018-05-22 | 南京航空航天大学 | A kind of double intumescent filler mortars |
| CN106431163B (en) * | 2016-09-29 | 2019-02-12 | 中铁隧道集团有限公司 | A kind of agent for fixing for stablizing face for loess tunnel |
| CN109538216B (en) * | 2018-12-21 | 2020-11-03 | 中铁二十五局集团第五工程有限公司 | Tunnel construction process for crossing mining and subsidence areas |
| CN113217037B (en) * | 2021-06-25 | 2022-08-30 | 中铁二局集团有限公司 | Backfill system and backfill method for single shield TBM or behind shield segment wall |
| CN114702291B (en) * | 2022-03-30 | 2023-02-10 | 山西省交通科技研发有限公司 | Grouting material for water inrush and mud inrush in broken tunnel zone and water plugging and reinforcing design method thereof |
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Effective date of registration: 20170405 Address after: An Zhen Dan Street Road No. 78 East chuangrong building A, room 301-6, 214100 Jiangsu District of Xishan city in Wuxi Province Patentee after: China Railway First Group Urban Rail Transit Engineering Co., Ltd. Patentee after: Zhongtie No.1 Bureau Group Co., Ltd. Address before: The northern section of Shaanxi city of Xi'an province 710054 Yanta Road No. 1 Patentee before: Zhongtie No.1 Bureau Group Co., Ltd. |