CN210239685U - Tunnel circumference slip casting structure - Google Patents
Tunnel circumference slip casting structure Download PDFInfo
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- CN210239685U CN210239685U CN201920693994.8U CN201920693994U CN210239685U CN 210239685 U CN210239685 U CN 210239685U CN 201920693994 U CN201920693994 U CN 201920693994U CN 210239685 U CN210239685 U CN 210239685U
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Abstract
The utility model relates to the technical field of tunnel construction, in particular to a tunnel circumferential grouting structure, which comprises a tunnel reinforcing body, wherein a plurality of grouting holes are circumferentially arranged on the tunnel reinforcing body, and a plurality of small guide pipes are arranged on the grouting holes in a matching way; the small guide pipe comprises a grouting pipe, and a pipe hoop and a conical head are respectively arranged at two ends of the grouting pipe; the grouting pipe comprises a reserved grout stopping section and a grouting section, and a plurality of grout outlet holes are formed in the grouting section. The utility model has the advantages of reasonable design, through the structure setting of little pipe, whole slip casting stable in structure, the slip casting is efficient, effectual, does benefit to popularization and application.
Description
Technical Field
The utility model relates to a tunnel construction technical field specifically is a tunnel circumference slip casting structure.
Background
Tunnels are engineering structures buried in the ground and are a form of human use of underground space. The tunnel can be divided into a traffic tunnel, a hydraulic tunnel, a municipal tunnel, a mine tunnel and the like.
The structure of the tunnel comprises two parts, namely a main building and accessory equipment. The main building consists of a hole body and a hole door; the auxiliary equipment comprises a car-avoiding hole, fire-fighting equipment, emergency communication and water-proof and drainage equipment, and the long tunnel is also provided with special ventilation and lighting equipment.
The existing tunnel grouting structure is not reasonable enough in arrangement, poor in grouting structure stability, low in grouting efficiency and poor in grouting effect, and has limitation. Therefore, in view of the above situation, it is urgently needed to develop a circumferential grouting structure for a tunnel to overcome the shortcomings in the current practical application.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the utility model is to provide a tunnel circumference slip casting structure to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
a tunnel circumferential grouting structure comprises a tunnel reinforcing body, wherein a plurality of grouting holes are circumferentially formed in the tunnel reinforcing body, and small guide pipes are arranged on the plurality of grouting holes in a matched mode; the small guide pipe comprises a grouting pipe, and a pipe hoop and a conical head are respectively arranged at two ends of the grouting pipe; the grouting pipe comprises a reserved grout stopping section and a grouting section, and a plurality of grout outlet holes are formed in the grouting section.
As a further aspect of the present invention: and 16 grouting holes are uniformly formed in the tunnel reinforcing body in the circumferential direction.
As a further aspect of the present invention: and the gap between the small catheter and the tunnel reinforcing body is filled with an anchoring agent.
As a further aspect of the present invention: the small guide pipes are arranged perpendicular to the outer surface of the tunnel reinforcing body, and the distance between the pipe hoop ends of every two adjacent small guide pipes is 1.795 m.
As a further aspect of the present invention: the overall length of the small duct is 1.85 m.
As a further aspect of the present invention: the length of the grouting pipe is 1.5m, the diameter of the grouting pipe is 42mm, the wall thickness is 3.5mm, and the grouting pipe is a hot-rolled seamless steel pipe.
As a further aspect of the present invention: the cone head is of a garlic clove-shaped cone structure, and the length of the cone head is 20 cm.
As a further aspect of the present invention: the grouting section is located between the conical head and the reserved grout stopping section, and the length of the reserved grout stopping section is 30 cm.
As a further aspect of the present invention: the aperture of the pulp outlet holes is 6mm, the distance between every two adjacent pulp outlet holes is 15cm, and the pulp outlet holes are arranged in a quincunx shape.
Compared with the prior art, the utility model discloses the beneficial effect of embodiment is:
this tunnel circumference slip casting structure, structural design is reasonable, and through the structure setting of little pipe, whole slip casting stable in structure, slip casting is efficient, effectual, does benefit to popularization and application.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic structural view of a small catheter in an embodiment of the present invention.
Fig. 3 is a flow chart of a grouting process according to an embodiment of the present invention.
In the figure: 1-pipe hoop, 2-conical head, 3-reserved grout stopping section, 4-grout outlet, 5-grouting pipe, 6-small conduit, 7-grouting hole and 8-tunnel reinforcing body.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.
In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.
In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.
Example 1
Referring to fig. 1-3, in an embodiment of the present invention, a circumferential grouting structure for a tunnel includes a tunnel reinforcing body 8, a plurality of grouting holes 7 are circumferentially formed on the tunnel reinforcing body 8, and a small conduit 6 is cooperatively installed on the plurality of grouting holes 7; the whole length of small pipe 6 is 1.85m, and small pipe 6 includes steel slip casting pipe 5, and the length of slip casting pipe 5 is 1.5m, and the diameter of slip casting pipe 5 is 42mm, and the wall thickness is 3.5mm, and slip casting pipe 5 is hot rolling seamless steel pipe, the both ends of slip casting pipe 5 are provided with ferrule 1 and conical head 2 respectively, and ferrule 1 is made for the iron material, and conical head 2 is garlic clove form toper structure, and conical head 2's length is 20cm, slip casting pipe 5 is including reserving section 3 and the slip casting section, just the slip casting section is located conical head 2 and reserving between section 3, a plurality of grout outlet 4 have been seted up on the slip casting section, and the aperture of grout outlet 4 is 6mm, and the distance between two adjacent grout outlet 4 is 15cm, and a plurality of grout outlet 4 is plum blossom shape and arranges, the length of reserving section 3 is 30 cm.
Example 2
Referring to fig. 1-2, the present embodiment is different from embodiment 1 in that:
in this embodiment, 16 grouting holes 7 are uniformly formed in the tunnel reinforcing body 8 in the circumferential direction, and the tunnel reinforcing body 8 is [ PX ]]ZThe type increases pre-buried injected hole 7 special lining cutting ring section of jurisdiction, and 16 injected holes 7 are 22.5 evenly distributed with the ring heart contained angle, and the upper half ring or the lower half ring of tunnel reinforcement body 8 need be in 9 injected holes 7 slip casting.
In this embodiment, the gap between the small catheter 6 and the tunnel reinforcement 8 is filled with an anchoring agent.
In this embodiment, little pipe 6 perpendicular to tunnel adds solid 8's surface setting, and the distance between 1 ends of ferrule of two adjacent little pipe 6 is 1.795m, and the slip casting diffusion radius reaches 0.9m and can satisfy the reinforcement demand.
Material and equipment planning:
1) according to the design requirement, the secondary grouting adopts cement-water glass double-liquid slurry, the slurry is injected into the tunnel reinforcing body 8 through the small guide pipe 6 to play a role in reinforcing the soil body, and the matching ratio and the performance index of the double-liquid slurry are determined according to the field test and are shown in the following table 1:
the water glass and the cement are advanced 30 days in advance, and the qualified detection result is ensured when the raw materials are put into use. Cement is stacked at the west end of the station, and water glass is stacked on the middle plate; when the material conveying device is used, materials are vertically conveyed to a station bottom plate battery car through a gantry crane and are horizontally conveyed to a trolley rear grouting platform through the battery car.
2) The secondary grouting uses the specialized secondary grouting machinery, equip 2 pieces of shield of SMSC17#, SMSC18# at the scene separately, install on shield last a section of car grouting platform, mainly by a cement mortar churn, a water glass storage cylinder, a grouting pump make up. The grouting pump adopts a double-liquid grouting pump, is provided with two control valves and two pressure gauges, can control the pressure and the flow of each slurry, and mixes the water glass and the cement slurry at the mixing valve through two high-pressure hoses. And (5) advancing along with the shield and replenishing slurry along with the shield. The equipment tool configuration is shown in table 2 below:
the purpose of secondary grouting is as follows:
1) after synchronous slip casting behind one's back, the thick liquid can have volume shrinkage about 1.4% at the in-process that solidifies, still because of the thick liquid takes place to run off, can form the cavity at the section of jurisdiction back. Due to the existence of the cavity, the stratum at the position is easy to collapse and deform, and the ground settlement and the tunnel floating can be caused along with the expansion of the soil body loosening range. And the cavity on the back of the duct piece is filled in time by secondary grouting, so that no space for deformation of the stratum exists, and ground subsidence and tunnel floating are effectively controlled.
2) In the water-rich layer, underground water can be gathered to form a water bag, and if the water stop strip of the pipe piece is loosened or concrete at the position of the water stop strip cracks and falls off, a water seepage channel is formed. Water in the water bag can enter the tunnel from the water seepage channel, and the tunnel seepage is caused. Through secondary grouting, the gaps are completely filled with slurry, the water sac is reduced or eliminated, the water pressure of the gaps on the back surface of the duct piece is reduced, water seepage can be effectively controlled, and the waterproof purpose is achieved.
Grouting mode and technological process:
1) please refer to fig. 3 for the injection method and process flow of the secondary slurry;
2) and (3) drilling through the grouting holes 7: in the segment in the grouting range, before grouting, an electric drill is used for drilling through the grouting hole 7, and then a small guide pipe 6 is immediately installed;
3) installing the small guide tube 6 and sealing the orifice: the grouting soil layer has a small amount of powdery clay which is in a hard plastic state locally, other soil layers are in a plastic state, the soil is soft, holes do not need to be drilled in advance, and the flower tube is directly driven into the grouting hole 7 by using a hammering method. Then, the small conduit 6 and the tunnel reinforcing body 8 are sealed by the anchoring agent to prevent water leakage and slurry leakage.
After the trolley is separated from the duct piece and reaches the grouting range, grouting is performed by using trolley rear grouting equipment. After the grouting pipe is installed, various pipelines such as the grouting pipe are connected, an orifice valve needs to be closed during first grouting, a grouting pump is started to conduct pipeline water-pressing test, and if leakage exists, maintenance is conducted in time, and test pressure is equal to final grouting pressure. And opening the valve to start grouting after the water pressure test confirms that the pipeline has no leakage. The grouting parameters are shown in table 3 below:
controlling the grouting process:
1) checking whether the grouting system is in a normal working state or not and whether the pressure gauge is normal or not;
2) tamping concrete with the thickness of 25mm at the bottom of the hoisting hole by using a steel bar, installing a connecting valve on the hoisting hole, connecting the mixing valve with the connecting valve, and then checking the sealing property of pipeline connection again;
3) stirring the slurry in a slurry stirring cylinder according to a designed water-cement ratio, and strictly preventing the slurry from caking so as to prevent a grouting pipe from being blocked;
4) when secondary grouting is carried out, starting a grouting pump, then opening a cement paste control valve, and opening a water glass slurry control valve after the flow of cement slurry is stable;
5) when the secondary grouting is finished, stopping pumping the water glass slurry, and stopping pumping the cement slurry after 10-15 seconds;
6) after grouting, flushing the mixing valve and the connecting valve in time to smoothly carry out next grouting;
7) after the secondary grouting is finished, sealing each grouting hole 7 to prevent water seepage; the sealing ring of the grouting hole 7 and the sealing ring of the grouting pipe cover are made of expansion-damping type water-swelling rubber products.
And (3) grouting ending control: and grouting is carried out by adopting double control measures of final grouting pressure and grouting amount, the grouting pressure is preferably 0.5-1.0 MPa, grouting is stopped after the pressure is maintained for 3-5 mm, and the grouting amount is generally 1.5 times of that of the slurry diffusion cylinder. If the grouting amount is over-limit and the pressure requirement is not met, the slurry concentration is adjusted to continue grouting until the grouting quality standard is met. And the soil body around the drill hole and the holes around the steel pipe are both filled with slurry, so that grouting can be stopped. During grouting, if the pressure rises suddenly, pipe blockage can occur, and the machine should be stopped for inspection.
According to the grouting pressure gauge or the flow meter, when the grouting pressure or the grouting amount meets the requirements, the ball valve is closed, grouting is stopped, and the ball valve is taken out after 12 hours to ensure that the grout is solidified.
And (3) closing the ball valve, and in the process of separating the grouting hose, because the double-liquid slurry in the pipe still has pressure, the slurry can be splashed onto the pipe piece in the pipe taking process, and the pipe needs to be washed by water in time.
A specially-assigned person is responsible for filling a grouting record table in the grouting process, data such as grouting time, slurry consumption, grouting pressure and the like are recorded, the value of the pressure gauge is observed, and abnormal conditions caused by pressure surge are avoided.
Note that:
1) a full-hole one-time injection type;
2) the working surface is sealed before grouting to prevent slurry leakage and leakage;
3) firstly, injecting anhydrous holes and then injecting water holes, and sequentially downwards from the vault, and if slurry flees or runs, grouting by one hole or a plurality of holes at intervals;
4) the slurry is prevented from overflowing the effective range; if the grouting amount is continuously increased and the grouting pressure is stable, stopping grouting, and waiting for a period of time and then grouting;
5) after grouting, cleaning the pump, the valve and the pipeline in time to ensure that the machine is intact and the pipeline is unblocked;
6) grouting reinforcement according to the reinforcement range, grouting holes 7 (including hoisting holes) in the reinforcement range are all opened for grouting, and no extra hole is formed;
7) checking the condition of the duct piece before grouting, tracking and observing in the grouting process, stopping grouting immediately if abnormal conditions exist, and reporting to a competent department in time;
8) the pressure condition should be closely monitored in the injection process, and the grouting pressure is controlled to be strictly controlled according to the given range of a grouting pressure gauge;
9) when the pressure is too high but the injection effect is not obvious in the injection process, whether a grouting pump and a grouting pipeline are blocked or not needs to be checked, and the grouting pump and the grouting pipeline are immediately cleaned;
10) cleaning a grouting pump and a grouting pipeline when any shutdown phenomenon occurs in the grouting process; after grouting is finished, "complete material cleaning" is needed, all machines and tools are cleaned and returned to the original place;
11) all ball valves of the synchronous grouting pipeline are closed before grouting; note the paragraph spacing;
12) after the grouting head is removed, plugging the grouting hole by using fast cement mortar, and arranging a plastic plug;
13) when a hole is injected, sufficient cement and water glass are prepared, and the injection is strictly prohibited to stop in the midway;
14) and when any shutdown phenomenon occurs in the grouting process, the grouting pump and the grouting pipeline are cleaned.
Calculating grouting pressure: the depth of the stratum where the grouting is located is estimated, the grouting pressure is increased along with the increase of the grouting depth, the shallow part increasing rate is high, and the depth increasing rate is low.
P ═ KH; wherein, P is designed grouting pressure (final pressure value) and unit Mpa; h is the depth of the grouting position in m; k is a pressure coefficient determined by grouting depth, and takes the following values: 0.03 to 0.028.
Theoretical grouting amount of single small conduit 6: q ═ pi R2L ηαβ, wherein L is the length of the conduit, R is the diffusion radius of the slurry, η is the porosity of the stratum, 2-3% of weathered rock stratum, 5-8% of rock breaking zone, 40-60% of sand and 20-40% of clay are taken, α is the effective filling rate of the slurry and 85% of the slurry, β is the loss coefficient of the slurry and 1.1-1.3 of the slurry, and the average value of the engineering is 1.2 temporarily.
The above is only the preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, without departing from the concept of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent.
Claims (9)
1. A tunnel circumferential grouting structure comprises a tunnel reinforcing body (8), and is characterized in that a plurality of grouting holes (7) are circumferentially formed in the tunnel reinforcing body (8), and small guide pipes (6) are installed on the plurality of grouting holes (7) in a matched mode; the small guide pipe (6) comprises a grouting pipe (5), and a pipe hoop (1) and a conical head (2) are respectively arranged at two ends of the grouting pipe (5); the grouting pipe (5) comprises a reserved grout stopping section (3) and a grouting section, and a plurality of grout outlet holes (4) are formed in the grouting section.
2. The circumferential grouting structure for the tunnel according to claim 1, wherein 16 grouting holes (7) are uniformly formed in the tunnel reinforcing body (8) in the circumferential direction.
3. The tunnel circumferential grouting structure according to claim 1 or 2, characterized in that the gap between the small conduit (6) and the tunnel reinforcement (8) is filled with an anchoring agent.
4. The structure of grouting circumferentially in a tunnel according to claim 3, characterized in that said small ducts (6) are arranged perpendicularly to the outer surface of the tunnel reinforcement (8), the distance between the ends of the ferrules (1) of two adjacent small ducts (6) being 1.795 m.
5. The tunnel circumferential grouting structure according to claim 1, characterized in that the overall length of the small ducts (6) is 1.85 m.
6. The tunnel circumferential grouting structure according to claim 1 or 5, wherein the length of the grouting pipe (5) is 1.5m, the diameter of the grouting pipe (5) is 42mm, the wall thickness is 3.5mm, and the grouting pipe (5) is a hot-rolled seamless steel pipe.
7. The tunnel circumferential grouting structure of claim 6, wherein the conical head (2) is a garlic clove-shaped conical structure, and the length of the conical head (2) is 20 cm.
8. The circumferential grouting structure of a tunnel according to claim 7, characterized in that the grouting section is located between the conical head (2) and the reserved grout stop section (3), and the length of the reserved grout stop section (3) is 30 cm.
9. The circumferential grouting structure of a tunnel according to claim 6, characterized in that the diameter of the grout outlet holes (4) is 6mm, the distance between two adjacent grout outlet holes (4) is 15cm, and a plurality of grout outlet holes (4) are arranged in a quincunx shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920693994.8U CN210239685U (en) | 2019-05-16 | 2019-05-16 | Tunnel circumference slip casting structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920693994.8U CN210239685U (en) | 2019-05-16 | 2019-05-16 | Tunnel circumference slip casting structure |
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| CN210239685U true CN210239685U (en) | 2020-04-03 |
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| CN201920693994.8U Active CN210239685U (en) | 2019-05-16 | 2019-05-16 | Tunnel circumference slip casting structure |
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