CN113756839A - Vibration-damping synchronous grouting system and grouting method for shield underpass building structure - Google Patents
Vibration-damping synchronous grouting system and grouting method for shield underpass building structure Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000013016 damping Methods 0.000 title claims description 27
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- 238000012360 testing method Methods 0.000 description 5
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- 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
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
Abstract
The invention relates to a vibration reduction synchronous grouting system for a shield under-penetration building structure, which comprises an air compression device, an accelerator aggregate barrel, a rubber powder aggregate barrel, an additive pipeline and a synchronous grouting pipeline, wherein the air compression device is connected with the accelerator aggregate barrel; the accelerator and the rubber powder are placed in a collecting barrel, and the collecting barrel is separated into the accelerator collecting barrel and the rubber powder collecting barrel; an independent additive pipeline is arranged on one side of a synchronous grouting pipeline of the shield tunneling machine, the synchronous grouting pipeline and the additive pipeline are fixed at a shield tail brush, the synchronous grouting pipeline and the additive pipeline are consistent in direction and fixed at an outlet through a double-pipe buckle. The invention has the beneficial effects that: according to the invention, an independent additive pipeline is arranged on one side of the synchronous grouting pipeline of the shield machine, the additive can be injected only by opening a valve, the injection is synchronously carried out in the shield tunneling process, the soil layer strength is reinforced by grouting into the soil layer and the hole of the segment, and the problem of floating in the construction stage can be well controlled.
Description
Technical Field
The invention relates to the field of tunnel construction, in particular to a vibration-damping synchronous grouting system for a shield underpass building structure, which is suitable for grouting of a shield tunnel, and is particularly suitable for underpass residential areas, hospitals and other places with strict vibration control.
Background
Urban rail transit is the development direction of modern city construction. The rail transit has important significance for solving the traffic jam of a large city and driving the upstream and downstream development of the subway line, is deeply favored by the majority of citizens by virtue of the characteristics of punctuality and convenience, but the vibration and noise problems brought along with the rail transit also puzzle the lives of the residents along the subway line, and the vibration problem caused by train operation needs to be solved urgently. The urban area environmental vibration standard stipulates: the standard value of the vertical Z vibration level of the lead in the daytime is 60-80dB, and the standard value of the lead in the night is reduced by 0-3dB on the basis of the daytime, so that domestic and foreign scholars are constantly dedicated to researching and solving the problems generated by urban rail transit.
In the case of underground rail traffic, the vibration and noise influencing factors are mainly train speed, train quality and rail type, etc. In addition, vibrations are amplified by dynamic effects caused by rail irregularities and uneven wear of the rail contact surfaces. In order to reduce the interference of environmental vibration to precision instruments in hospitals and scientific research institutions and influence on daily life of residents, underground traffic can adopt some vibration isolation measures to meet the requirement of environmental protection in the construction process. The steel spring ballast bed vibration isolation system of the division firm company is a relatively effective vibration reduction measure at present, is a measure for reducing vibration caused by train operation from a vibration source, and is firstly adopted by No. 3 and No. 4 lines of Guangzhou subway, the vibration and noise interference generated by train operation are greatly reduced by the application of the technology, and the vibration reduction and the noise reduction can be realized by 30 dB. The same is Guangzhou subway No. 3 line, adopts Vanguard damping fastener to be applied to domestic urban rail transit engineering for the first time, and the damping falls and makes an uproar and reaches 15 dB. Vibration isolation gutters are also a good way of barrier isolation to impede or alter the propagation of vibration waves, thereby reducing ground and building vibrations. Most of the existing vibration source vibration isolation measures are patent products of foreign companies, and the manufacturing cost is very high, so the application range is greatly limited, and most cities cannot bear the huge construction cost.
The grouting process of the shield tunnel is one of the essential procedures of shield tunnel construction, and is a better measure for improving the stability of a tunnel body and controlling ground settlement. In recent years, a great deal of research is done on grouting construction processes and materials at home and abroad. The patent of application No. 201910924389.1 discloses a shield tunnel instant quick-setting type synchronous grouting method and a quick-setting agent capsule, wherein a quick-setting agent encapsulated by a water-soluble encapsulating material is injected into synchronous grouting liquid in the tunneling process of a shield machine. The patent of application No. 202010387315.1 discloses a rubber particle anti-seismic synchronous grouting material, which consists of 80 parts of cement, 650 parts of sand, 390 parts of water, 250 parts of fly ash, 90 parts of special soil and 11.5 parts of an additive.
Because shield cutter head cutting maximum diameter is greater than the section of jurisdiction external diameter, after the shield tail breaks away from the section of jurisdiction, can form annular space between tunnel section of jurisdiction and the soil body, if can not in time pack will lead to section of jurisdiction infiltration, soil body settlement seriously still can make the section of jurisdiction wrong platform. Therefore, grouting after the duct pieces are installed is an important measure for preventing water seepage and ground surface settlement of the tunnel. The most used synchronous grouting in the shield tunnel construction at present comprises single-liquid grouting and double-liquid grouting. The single-liquid grouting is to inject a grout to the outside of the pipe piece through a grouting pressurizing unit and a grouting pipeline, wherein the main grout of the earth pressure balance shield represented by Germany is a hardenable grout. The double-liquid grouting is that two different kinds of grout enter a grout mixing section through two grouting pressurizing units and two grouting pipelines respectively and are uniformly mixed and then injected into a target area. The synchronous grouting of the slurry balance shield represented by Japan mainly adopts two-fluid grouting, and the main materials of the grouting are cement, bentonite, water glass and the like. The two-fluid grouting meets and condenses outside the shield shell, has short condensation time, and is beneficial to exerting the grouting condensation strength as soon as possible so as to keep the soil stable. The existing shield tunnel grouting technology is mainly applied to the important ring of improving the stability of soil around a tunnel, reducing the foundation subsidence and protecting the lining safety, so that the grouting technology plays a greater role in strict construction and safe operation guarantee. After the train runs, the vibration influence is obvious, and the construction cost is undoubtedly increased by adding vibration isolation and damping measures, so the vibration isolation design should be considered in the beginning of tunnel construction. Therefore, it is very important to provide a vibration-damping synchronous grouting system and a grouting method for a shield underpass building structure.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a vibration-reduction synchronous grouting system and a grouting method for a shield underpass building, which can inject a mixed liquid of rubber powder and an accelerator into synchronous grouting liquid while a shield machine tunnels, realize synchronous grouting and rapid coagulation, and reduce the influence of vibration problems caused by train operation on buildings above the tunnel after the tunnel is opened.
The vibration reduction synchronous grouting system for the shield under-penetration building structure comprises an air compression device, a setting accelerator collecting barrel, a rubber powder collecting barrel, an additive pipeline, a synchronous grouting pipeline, a setting accelerator collecting barrel valve and a rubber powder collecting barrel valve; the accelerator and the rubber powder are placed in a collecting barrel, and the collecting barrel is separated into the accelerator collecting barrel and the rubber powder collecting barrel; the bottom of the accelerator collecting barrel and the joint of the bottom of the rubber powder collecting barrel and the additive pipeline are respectively provided with an accelerator collecting barrel valve and a rubber powder collecting barrel valve; an independent additive pipeline is arranged on one side of a synchronous grouting pipeline of the shield tunneling machine, the synchronous grouting pipeline and the additive pipeline are fixed at a shield tail brush, the synchronous grouting pipeline and the additive pipeline are in the same direction and are fixed at an outlet through a double-pipe buckle; and a second pressure gauge is arranged at the outlet of the additive pipeline, an air compressor interface is arranged on the pipeline of the additive pipeline close to the inlet and is connected with an air compressor device, and a first pressure gauge is arranged on the outlet side of the pipeline of the air compressor interface.
Preferably, the method comprises the following steps: and the outlet at the bottom of the accelerator collecting barrel and the outlet at the bottom of the rubber powder collecting barrel are respectively provided with an accelerator collecting barrel sealing ring and a rubber powder collecting barrel sealing ring.
Preferably, the method comprises the following steps: the outlet of the additive pipeline is provided with a spiral injection device.
Preferably, the method comprises the following steps: and the outlets of the synchronous grouting pipeline and the additive pipeline are respectively provided with a detachable sealing port I and a detachable sealing port II.
Preferably, the method comprises the following steps: the accelerator collecting barrel valve and the rubber powder collecting barrel valve are both connected to the microcomputer controller.
Preferably, the method comprises the following steps: the diameter of the rubber powder is less than 0.1 mm.
The grouting method of the vibration-damping synchronous grouting system for the shield under-penetration building structure comprises the following steps:
s1, connecting the synchronous grouting pipeline and the additive pipeline in parallel, and opening a grouting port; fixing a synchronous grouting pipeline and an additive pipeline at the shield tail brush, and sealing a synchronous grouting pipeline valve, an accelerator collecting barrel valve and a rubber powder collecting barrel valve;
s2, preparing synchronous grouting liquid, and preparing an accelerator and rubber powder; starting an air compression device to ensure that an additive pipeline is smooth;
s3, starting grouting: adjusting a synchronous grouting pipeline valve to change the grouting amount; adjusting a valve of the accelerator collecting barrel and a valve of the rubber powder collecting barrel, and changing the mixing amount of the accelerator and the rubber powder; observing the readings of a first pressure gauge and a second pressure gauge on an additive pipeline in the additive injection process, and controlling the grouting amount of the synchronous grouting liquid and the injection amount of the additive;
s4, stopping grouting: closing a synchronous grouting pipeline valve, closing an accelerator collecting barrel valve, and closing a rubber powder collecting barrel valve; the air compressor works for a period of time again, and the additive pipeline is dredged again.
Preferably, the method comprises the following steps: in step S2, the synchronous grouting liquid is single-liquid grouting; the accelerating agent adopts water glass or a mixed solution of the water glass and a calcium chloride solution.
Preferably, the method comprises the following steps: in step S3, once the pressure value of the second pressure gauge is larger than that of the first pressure gauge, the additive pipeline is blocked, at the moment, the accelerator collecting barrel valve and the rubber powder collecting barrel valve are closed, the set value of the air pressure device is increased, the pipeline is cleaned by larger air pressure, and grouting is restarted until the readings of the two pressure gauges are the same; the spraying speed of the accelerator is controlled by adjusting the pressure of the air compression device.
Preferably, the method comprises the following steps: in step S3, the formula for calculating the grouting amount Q is as follows:
Q＝V·α
wherein V is the theoretical pore volume; alpha is the injection rate; r is the outer diameter of the cutter head of the shield machine; r is the outside diameter of the segment; h is the length of the segment;
α＝1+α1+α2+α3+α4
in the formula, alpha1Is the compaction coefficient; alpha is alpha2Is the soil property coefficient; alpha is alpha3The construction loss factor is obtained; alpha is alpha4Is an override factor.
The invention has the beneficial effects that:
1. the invention provides a vibration-damping synchronous grouting system suitable for a downward-penetrating building, wherein an independent additive pipeline is arranged on one side of a synchronous grouting pipeline of a shield machine, injection can be carried out only by opening a valve, the grouting is synchronously carried out in the shield tunneling process, the soil layer strength is reinforced by grouting into the soil layer and the holes of segments, and the problem of upward floating in the construction stage can be well controlled.
2. The invention adopts the design of two grouting pipelines, can effectively adjust the size of various grouting amounts, and compared with the existing double-liquid grouting, the high pressure of the additive pipeline can spray the additive far so as to prevent the pipe orifice from being blocked.
3. The rubber powder collecting barrel is independently arranged, the addition amount of the high-damping material can be adjusted, the mixing amount problem in the synchronous grouting liquid can be effectively controlled in actual construction, and the trouble of repeated material mixing is avoided.
4. The high-damping grouting material is used as the grouting material, the high-damping grouting material mainly plays a role in the vibration problem generated in the train operation stage after the tunnel is completed, and meanwhile, the grouting material can absorb energy and protect tunnel segments when natural disasters such as earthquakes occur.
5. The invention is provided with the accelerator collecting barrel independently, and can control the injection amount of the accelerator, thereby adjusting the proportion of the accelerator in the grouting liquid and controlling the solidification time of the grouting liquid.
6. The invention can adjust the setting time and the content of high damping materials in the slurry, and is obviously superior to similar products in the current market. When the soil quality of the construction stratum is poor, the soil can be quickly solidified, the ground surface settlement and the tunnel floating are controlled, the deformation can be controlled, and the energy can be absorbed in the train operation stage to prevent the influence on the building.
Drawings
FIG. 1 is a schematic view of a vibration-damping synchronous grouting system for a shield underpass building structure;
FIG. 2 is a schematic view of the outlet of the simultaneous grouting line and the additive line;
FIG. 3 is a schematic view of an accelerator and a rubber powder collecting barrel.
Description of reference numerals: 1-soft soil layer; 2, a shield machine; 3-a first pressure gauge; 4-an air compression device; 5-accelerator collecting barrel; 6-rubber powder collecting barrel; 7-tail brush; 8-outlet of grouting pipeline; 9-unconsolidated slip casting; 10-cemented grouting liquid; 11-a microcomputer controller; 12-additive line; 13-synchronous grouting of pipelines; 14-double pipe buckle; 15-detachable sealing port I; 16-detachable sealing port two; 17-a spiral spray device; 18-a second pressure gauge; 19-rubber powder collecting barrel sealing ring; 20-accelerator collecting barrel sealing ring; 21-accelerator collecting barrel valve; 22-rubber powder collecting barrel valve; 23-a tube sheet.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Example one
The embodiment of the application provides a shield constructs synchronous slip casting system of building structure damping under wearing, including air compressor arrangement 4, accelerator aggregate bucket 5, rubber powder aggregate bucket 6, additive pipeline 12, step slip casting pipeline 13, accelerator aggregate bucket valve 21, rubber powder aggregate bucket valve 22. The accelerator and the rubber powder are placed in a collecting barrel, and the collecting barrel is separated into an accelerator collecting barrel 5 and a rubber powder collecting barrel 6 at intervals, so that the accelerator and the rubber powder are separated. The joint of the bottom of the accelerator collecting barrel 5 and the bottom of the rubber powder collecting barrel 6 with the additive pipeline 12 is respectively provided with an accelerator collecting barrel valve 21 and a rubber powder collecting barrel valve 22 which respectively control the injection proportion of the accelerator and the rubber powder. In order to prevent the accelerator from reacting with the synchronous grouting liquid in the synchronous grouting pipeline, an independent additive pipeline 12 is arranged on one side of a synchronous grouting pipeline 13 of the shield tunneling machine 2, the synchronous grouting pipeline 13 and the additive pipeline 12 are fixed at the shield tail brush 7, the additive pipeline 12 is not communicated with the synchronous grouting pipeline 13 and is connected in parallel, the synchronous grouting pipeline 13 and the additive pipeline 12 are prevented from reacting in the pipeline, the pipeline is blocked, the synchronous grouting pipeline 13 and the additive pipeline 12 are consistent in trend and are fixed at an outlet through a double-pipe buckle 14, on one hand, the same grouting direction is ensured, on the other hand, a certain gap exists between the two pipelines, and pipeline blockage caused by condensation at the outlet is prevented. A second pressure gauge 18 is arranged at the outlet of the additive pipeline 12, an air compressor connector is arranged on the pipeline of the additive pipeline 12 close to the inlet and is connected with an air compressor device 4 to serve as a power output and size adjusting device of the additive, the additive in the pipeline is pressed into the pores through air pressure, and a first pressure gauge 3 is arranged on the outlet side of the pipeline of the air compressor connector.
The bottom outlets of the accelerator collecting barrel 5 and the rubber powder collecting barrel 6 are respectively provided with an accelerator collecting barrel sealing ring 20 and a rubber powder collecting barrel sealing ring 19.
The outlet of the additive pipeline 12 is provided with a spiral injection device 17 which is used for adjusting the injection radius of the additive and enabling the additive to be uniformly injected so as to prevent the additive from accumulating at the tail end of the pipeline.
The outlet 8 of the grouting pipeline and the outlet of the additive pipeline 12 are respectively provided with a first detachable sealing port 15 and a second detachable sealing port 16.
The accelerator collecting barrel valve 21 and the rubber powder collecting barrel valve 22 are both connected to the microcomputer controller 11.
The diameter of the rubber powder is less than 0.1mm, so that additive pipelines are prevented from being blocked. The present invention is not limited to rubber powder, and other high damping materials may be used as long as they do not react with the accelerator.
Example two
The second embodiment of the application provides a grouting method of a vibration reduction synchronous grouting system of a shield under-penetration structure, which comprises the following steps:
and S1, connecting the synchronous grouting pipeline 13 and the additive pipeline 12 in parallel, and opening the grouting port. And (3) fixing a synchronous grouting pipeline 13 and an additive pipeline 12 at the shield tail brush 7, sealing a synchronous grouting pipeline valve, an accelerator collecting barrel valve 21 and a rubber powder collecting barrel valve 22, and preparing for grouting.
S2, preparing synchronous grouting liquid, wherein the synchronous grouting liquid is single-liquid grouting and comprises 100 parts of cement, 175 parts of fly ash, 175 parts of standard sand, 120 parts of bentonite, 15 parts of a water reducing agent and 400 parts of water. The method comprises the following steps of preparing an accelerator and rubber powder, wherein the accelerator can be water glass only or a mixed solution of the water glass and a calcium chloride solution, the calcium chloride solution is added into synchronous grouting liquid, the calcium chloride solution and the synchronous grouting liquid can react quickly to form gel after being injected into gaps, the gel plays a role in cementing soil and filling the gaps, 400 parts of the water glass and 200 parts of the rubber powder can be adopted, and the invention is not limited to the above materials, and other common additives in double-liquid grouting can be used. And opening the air compression device 4 to keep the additive pipeline smooth.
And S3, starting grouting. Adjusting a synchronous grouting pipeline valve to change the grouting amount; and adjusting the accelerator collecting barrel valve 21 and the rubber powder collecting barrel valve 22 to change the mixing amount of the accelerator and the rubber powder. Observing the readings of the first pressure gauge 3 and the second pressure gauge 18 on the additive pipeline 12 in the additive injection process, in case that the readings of the two pressure gauges are abnormal (the pressure value of the second pressure gauge 18 is larger than the pressure value of the first pressure gauge 3), considering that the pipeline is blocked, closing the additive valve, increasing the set value of the air pressure device, cleaning the pipeline by using larger air pressure, and restarting grouting until the readings of the two pressure gauges are close. The synchronous grouting amount of the grouting liquid and the additive injection amount are controlled, the injection amount of the accelerator is controlled by adjusting the accelerator collecting barrel valve 21, the injection speed of the accelerator is controlled by adjusting the pressure of the air compression device 4, and the accelerator can be ensured to be dispersed and distributed when being injected.
Wherein: the formula for calculating the grouting amount Q is as follows:
Q＝V·α
wherein V is the theoretical pore volume; alpha is the injection rate; r is the outer diameter of the cutter head of the shield machine; r is the outside diameter of the segment; h is the length of the segment;
α＝1+α1+α2+α3+α4
in the formula, alpha1Is the compaction coefficient; alpha is alpha2Is the soil property coefficient; alpha is alpha3The construction loss factor is obtained; alpha is alpha4Is an override factor.
And S4, stopping grouting. And (3) closing the synchronous grouting pipeline valve, closing the accelerator collecting barrel valve 21 and closing the rubber powder collecting barrel valve 22. The air compressor 4 works for a period of time again to dredge the additive pipeline 12 again, so as to prevent the next use from being blocked.
EXAMPLE III
In the third embodiment of the application, cement, fly ash, standard sand, bentonite, water, a water reducing agent and rubber powder are mixed according to different proportions. According to the feeding sequence of the aggregate, the cement, the fly ash, the special soil, the water and the additive, the raw materials are sequentially and uniformly fed into a cement mortar stirrer, and the synchronous grouting material is obtained after uniform mixing. The standard slump cone test is adopted to measure the fluidity of the synchronous grouting material, the uniaxial compressive strength test is adopted to measure the strength of a grouting test block, the mortar elastic modulus tester is adopted to measure the elastic modulus of the grouting material after cementation, and the aggregate proportion and the test results are shown in the following table.
TABLE 1 aggregate proportions and test results
As seen from the groups 1 and 4, the addition of the rubber powder weakens the fluidity of the mortar to a certain extent, increases the compressive strength to a certain extent, and reduces the elastic modulus to a certain extent. When group 1, group 4 and group 5 were compared, the greater the amount of rubber powder incorporated, the more significant the decrease in modulus of elasticity and the decrease in strength. Compared with the group 1, the group 2 and the group 3, under the condition of a certain amount of rubber powder, the fluidity and the compressive strength of the mortar are improved by replacing a part of fly ash with standard sand, but the elastic modulus is obviously reduced. Therefore, on the basis of improving the strength, the elastic modulus of the mortar after setting can be reduced by properly increasing the mixing amount of the rubber powder. Compared with the group 5 and the group 6, the reduction of the mixing amount of the fly ash can obviously reduce the compressive strength and the elastic modulus of the mortar after the mortar is condensed, and a good effect can be achieved from the vibration resistance perspective.
In the tunneling process of the shield tunneling machine 2, an accelerator and rubber powder are added into an additive pipeline 12 through an accelerator collecting barrel 5 and a rubber powder collecting barrel 6, the mixture is conveyed to the same position as the synchronous grouting liquid through the additive pipeline 12, and accelerator liquid mixed with the rubber powder and the synchronous grouting liquid are injected into a space between a pipe piece 23 and a soft soil layer 1; after a period of time, according to the proportion of the accelerator to the synchronous grouting liquid, the accelerator and the synchronous grouting liquid are cemented together to form a local coagulation block locally, a local support area is formed to quickly provide support between the soft soil layer 1 and the duct piece 23, and the deformation and floating of the tunnel are controlled; after the synchronous grouting liquid is completely condensed, the rubber powder controls vibration energy transmission from a vibration source by virtue of high damping characteristics under the running of a tunnel train, plays a role in vibration isolation and vibration reduction, prevents the ground buildings from being influenced by the vibration generated by the running of the train, and simultaneously provides protection for the tunnel when an earthquake disaster happens.
Claims (10)
1. The utility model provides a shield is worn to construct structure damping synchronous slip casting system down which characterized in that: comprises an air compression device (4), an accelerator collecting barrel (5), a rubber powder collecting barrel (6), an additive pipeline (12), a synchronous grouting pipeline (13), an accelerator collecting barrel valve (21) and a rubber powder collecting barrel valve (22); the accelerator and the rubber powder are placed in a collecting barrel, and the collecting barrel is separated into an accelerator collecting barrel (5) and a rubber powder collecting barrel (6); the connecting parts of the bottom of the accelerator collecting barrel (5) and the bottom of the rubber powder collecting barrel (6) and the additive pipeline (12) are respectively provided with an accelerator collecting barrel valve (21) and a rubber powder collecting barrel valve (22); an independent additive pipeline (12) is arranged on one side of a synchronous grouting pipeline (13) of the shield machine (2), the synchronous grouting pipeline (13) and the additive pipeline (12) are fixed at a shield tail brush (7), the synchronous grouting pipeline (13) and the additive pipeline (12) are in the same direction and fixed at an outlet through a double-pipe buckle (14); and a second pressure gauge (18) is arranged at the outlet of the additive pipeline (12), an air compressor interface is arranged on the pipeline of the additive pipeline (12) close to the inlet and connected with an air compressor device (4), and a first pressure gauge (3) is arranged on the outlet side of the pipeline of the air compressor interface.
2. The vibration-damping synchronous grouting system for the shield underpassing structure according to claim 1, characterized in that: the bottom outlets of the accelerator collecting barrel (5) and the rubber powder collecting barrel (6) are respectively provided with an accelerator collecting barrel sealing ring (20) and a rubber powder collecting barrel sealing ring (19).
3. The vibration-damping synchronous grouting system for the shield underpassing structure according to claim 1, characterized in that: a spiral injection device (17) is arranged at the outlet of the additive pipeline (12).
4. The vibration-damping synchronous grouting system for the shield underpassing structure according to claim 1, characterized in that: the outlets of the synchronous grouting pipeline (13) and the additive pipeline (12) are respectively provided with a detachable sealing port I (15) and a detachable sealing port II (16).
5. The vibration-damping synchronous grouting system for the shield underpassing structure according to claim 1, characterized in that: the accelerator collecting barrel valve (21) and the rubber powder collecting barrel valve (22) are both connected to the microcomputer controller (11).
6. The vibration-damping synchronous grouting system for the shield underpassing structure according to claim 1, characterized in that: the diameter of the rubber powder is less than 0.1 mm.
7. A grouting method of a vibration-damping synchronous grouting system of a shield under-construction structure according to claim 1, characterized by comprising the following steps:
s1, connecting the synchronous grouting pipeline (13) and the additive pipeline (12) in parallel, and opening a grouting port; a synchronous grouting pipeline (13) and an additive pipeline (12) are fixed at the shield tail brush (7), and a synchronous grouting pipeline valve, an accelerator aggregate collecting barrel valve (21) and a rubber powder collecting barrel valve (22) are closed;
s2, preparing synchronous grouting liquid, and preparing an accelerator and rubber powder; starting the air compression device (4) to ensure that the additive pipeline is smooth;
s3, starting grouting: adjusting a synchronous grouting pipeline valve to change the grouting amount; adjusting an accelerator collecting barrel valve (21) and a rubber powder collecting barrel valve (22) and changing the mixing amount of the accelerator and the rubber powder; observing the readings of a first pressure gauge (3) and a second pressure gauge (18) on an additive pipeline (12) in the additive injection process, and controlling the grouting amount of the synchronous grouting liquid and the injection amount of the additive;
s4, stopping grouting: closing a synchronous grouting pipeline valve, closing an accelerator collecting barrel valve (21), and closing a rubber powder collecting barrel valve (22); the air compression device (4) works for a period of time again, and the additive pipeline (12) is dredged again.
8. The grouting method of the vibration-damping synchronous grouting system for the shield under-penetration structure according to claim 7, characterized in that: in step S2, the synchronous grouting liquid is single-liquid grouting; the accelerating agent adopts water glass or a mixed solution of the water glass and a calcium chloride solution.
9. The grouting method of the vibration-damping synchronous grouting system for the shield under-penetration structure according to claim 7, characterized in that: in step S3, once the pressure value of the second pressure gauge (18) is larger than the pressure value of the first pressure gauge (3), the additive pipeline is blocked, at the moment, the accelerator collecting barrel valve (21) and the rubber powder collecting barrel valve (22) are closed, the set value of the air pressure device is increased, the pipeline is cleaned by using larger air pressure, and grouting is restarted until the readings of the two pressure gauges are the same; the spraying speed of the accelerating agent is controlled by adjusting the pressure of the air pressure device (4).
10. The grouting method of the vibration-damping synchronous grouting system for the shield under-penetration structure according to claim 7, characterized in that: in step S3, the formula for calculating the grouting amount Q is as follows:
Q＝V·α
wherein V is the theoretical pore volume; alpha is the injection rate; r is the outer diameter of the cutter head of the shield machine; r is the outside diameter of the segment; h is the length of the segment;
α＝1+α1+α2+α3+α4
in the formula, alpha1Is the compaction coefficient; alpha is alpha2Is the soil property coefficient; alpha is alpha3For the construction damageA loss factor; alpha is alpha4Is an override factor.
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Application publication date: 20211207 |