CN219045419U - Prevent shield and construct section of jurisdiction come-up slip casting structure - Google Patents
Prevent shield and construct section of jurisdiction come-up slip casting structure Download PDFInfo
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- CN219045419U CN219045419U CN202320169566.1U CN202320169566U CN219045419U CN 219045419 U CN219045419 U CN 219045419U CN 202320169566 U CN202320169566 U CN 202320169566U CN 219045419 U CN219045419 U CN 219045419U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
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Abstract
The utility model discloses a grouting structure for preventing shield segments from floating upwards, which comprises a connecting bridge, a conveyor, a trailer, a synchronous grouting system, a grouting tank and a plurality of ring segments sequentially arranged in a tunnel along the tunneling direction of the tunnel, wherein the synchronous grouting system is internally provided with a synchronous grouting pipe and a secondary grouting pipe, the other end of the secondary grouting pipe is provided with a three-way pipe in threaded connection with a secondary grouting hole of the segment, the other end of the three-way pipe is provided with a water glass pipe for injecting water glass solution after mixing, the other end of the water glass pipe is provided with a water glass storage tank for containing water glass solution, and the water glass pipe is also provided with a water glass pump. The shield segment floating device not only can solve the problem that shield segments float up when the shield machine tunnels in the water-rich rock stratum in the prior art, but also can prevent water from being accumulated around the shield machine when the shield machine is constructed in a downhill section.
Description
Technical Field
The utility model belongs to the technical field of tunnel construction, and particularly relates to a structure and a method for preventing shield segments from floating upwards.
Background
In the prior art, when the shield machine is tunneling in the water-rich rock stratum, in order to fix the duct piece and prevent the duct piece from floating up due to water oozing out of the stratum, first mortar needs to be injected through a grouting system synchronous with the shield machine, then after one end of each interval is separated, second mortar consisting of cement paste and water glass is injected in a supplementing mode for blocking water coming from the rear, and in order to facilitate subsequent supplementing injection, a threaded grouting hole is formed in the duct piece.
The following disadvantages exist with the above method: 1. when the second mortar is injected, the second mortar is stirred on site and then mixed with water glass, and is pumped to the corresponding duct piece through a grouting machine positioned in a tunnel, the time required for injection is different from 12 to 24 hours each time, and as the grouting machine is required to be manually conveyed into the tunnel, the shield machine is required to be stopped, namely, in the process of supplementing grouting, the shield machine cannot normally tunnel, and the construction efficiency is seriously reduced; 2. when the grouting is supplemented, 5-10t of cement slurry and 3-7t of water glass are consumed for each injection, so that the construction cost is increased; 3. when the grouting is supplemented, the cement paste needs to be stirred on site, the existing stirring equipment is relatively simple, the quality of a stirring finished product is inconvenient to control, dust stirred on site is large, the sight is easy to block, the physical health of workers is easy to influence, and certain potential safety hazards exist.
Disclosure of Invention
The utility model aims to provide a grouting structure for preventing shield segments from floating upwards, which solves the problem that shield segments float upwards when a shield machine tunnels in a water-rich rock stratum in the prior art by using the prior equipment and materials.
The technical scheme adopted by the utility model is as follows: prevent shield and construct section of jurisdiction come-up grouting structure, including the connecting bridge that is located shield tail rear, be provided with the conveyer that is used for transporting dregs out on the connecting bridge, and be provided with the trailer at the connecting bridge rear, be provided with synchronous grouting system in the trailer, be provided with grouting tank in the synchronous grouting system, its characterized in that: still be provided with synchronous grouting pipe and secondary grouting pipe in the synchronous grouting system, and synchronous grouting pipe and secondary grouting pipe's one end all is connected with the slip casting jar, the other end of secondary grouting pipe is provided with the three-way pipe with section of jurisdiction secondary grouting hole threaded connection, the other end of three-way pipe is provided with the water glass pipe that is used for pouring into after the water glass solution mixes, the other end of water glass pipe is provided with the water glass bin that holds water glass solution, still be provided with the water glass pump on the water glass pipe, water glass bin and water glass pump set up on connecting bridge or trailer, synchronous grouting pipe is used for the upper and lower left and right sides injection mortar of each ring section of jurisdiction, the three-way pipe is used for pouring into the mortar behind the mixed water glass solution to the top of the section of jurisdiction behind every interval.
As the preferable in the scheme, the synchronous grouting pipe and the secondary grouting pipe are respectively provided with a ball valve for controlling whether the corresponding pipelines are communicated.
Further preferably, the water glass storage tank and the water glass pump are arranged on a connecting bridge or a trailer.
Further preferably, a plurality of hoop grouting holes for installing the three-way pipe are uniformly formed in the pipe piece after a plurality of rings are spaced in the circumferential direction, and the plurality of hoop grouting holes located on the same ring pipe piece are arranged on the same cross section.
Further preferably, between any two adjacent segments provided with a plurality of secondary grouting holes, segments of 50-60 rings are spaced.
The utility model has the beneficial effects that:
1) On the basis of original grouting equipment, only one pump for pumping out water glass solution is added, compared with the prior art, equipment purchasing cost is reduced, and meanwhile, a worker is not required to be independently equipped for conveying the grouting machine for secondary grouting, so that labor cost is reduced.
2) In the grouting process, the secondary grouting is performed without stopping, and the grouting can be performed in the tunneling process, so that the working efficiency is improved.
3) The water glass solution and the mortar are uniformly mixed in advance through the three-way pipe and are immediately injected to the back part above the pipe piece after being mixed, and then the pipe piece is solidified, so that the floating of the pipe piece is prevented, the flowing distance of the mortar after being mixed is reduced, and the mixed mortar can be effectively prevented from being solidified in a pipeline to form blockage to influence normal construction;
if synchronous grouting is carried out on the pipe piece positioned at the front end of the tunneling direction in the tunneling process, meanwhile, only water glass is pumped at the upper end of the pipe piece at the rear side, and the water glass injected firstly reacts with the synchronous grouting liquid and then is solidified to form an interlayer, so that the water glass injected later cannot be fully contacted and solidified with the synchronous grouting liquid, and only the water glass injected firstly can play a role in controlling the floating of the pipe piece; in order to increase the reaction quantity of the water glass and the synchronous grouting liquid, strip-shaped grouting holes with larger area are required to be formed in the pipe piece, and the method damages the strength of the pipe piece.
4) One end of the synchronous grouting pipe and one end of the secondary grouting pipe are connected with the grouting tank, so that the mortar for synchronous grouting and secondary grouting are formed by stirring the mortar tank, and stirring of secondary mortar on a construction site is not needed, and therefore factors for generating safety risks are reduced.
5) After 50-60 rings are spaced, a hoop which is used for blocking the back water and forms a major arc is formed on the outer side of the duct piece by grouting, so that the situation that the back water is accumulated around the shield machine to cause larger water pressure and hydraulic gradient can be effectively prevented when the shield machine is constructed on a downhill section.
Drawings
FIG. 1 is a schematic view of a grouting structure according to the present utility model.
FIG. 2 is a schematic view of a hoop grouting hole according to the present utility model.
Detailed Description
The utility model is further illustrated by the following examples in conjunction with the accompanying drawings:
as shown in fig. 1-2, a structure for preventing shield segments from floating upwards mainly comprises a connecting bridge 1, a conveyor 2, a trailer 3, a synchronous grouting system 4, segments 5, a secondary grouting pipe 6, a three-way pipe 7, a water glass pipe 8, a water glass storage tank 9 and a water glass pump 10, wherein the connecting bridge 1 is arranged behind a shield tail, the conveyor 2 for transporting dregs is arranged on the connecting bridge 1, the trailer 3 is arranged behind the connecting bridge 1, the synchronous grouting system 4 is arranged in the trailer 3, and a grouting tank and a plurality of grouting pipes are arranged in the synchronous grouting system 4. When the shield tunneling machine is tunneling, a plurality of ring segments 5 are sequentially paved in the tunneling direction of the tunnel, each ring segment is formed by splicing 7 small segments, and the above technology is not repeated here.
The grouting pipes in the synchronous grouting system 4 are divided into a standby synchronous grouting pipe, a synchronous grouting pipe and a secondary grouting pipe 6, wherein the synchronous grouting pipe is used for injecting mortar to the upper, lower, left and right sides of each ring segment, namely the synchronous grouting pipe is used for realizing synchronous grouting, the secondary grouting pipe is used for realizing the injection of mortar in secondary slurry, and one ends of the synchronous grouting pipe and the secondary grouting pipe 6 are connected with a grouting tank. In the prior art, six grouting pipes in the synchronous grouting system are generally arranged, four grouting pipes are synchronous grouting pipes, two grouting pipes are standby synchronous grouting pipes, and in the embodiment, one standby grouting pipe is directly connected in short, namely, the standby grouting pipe is transformed into a secondary grouting pipe.
In order to realize the mixed injection of mortar and water glass solution during the secondary grouting, the other end of the secondary grouting pipe 6 is provided with a three-way pipe 7 in threaded connection with a pipe piece secondary grouting hole, meanwhile, the other end of the three-way pipe 7 is provided with a water glass pipe 8 for injecting the water glass solution after mixing, the other end of the water glass pipe 8 is provided with a water glass storage box 9 for containing the water glass solution, and in order to realize the pumping of the water glass solution, the water glass pipe 8 is also provided with a water glass pump 10. The three-way pipe 7 is used for injecting mortar mixed with water glass solution above the pipe piece after each interval is one ring, and because the length of the three-way pipe is smaller, the moving distance after the water glass solution and the mortar are mixed is also smaller, so that the mortar mixed with the water glass solution is not easy to solidify in the three-way pipe, and the situation that the three-way pipe is blocked is reduced.
In order to facilitate the independent control of the synchronous grouting pipe, the secondary grouting pipe and the standby grouting pipe, ball valves for controlling whether corresponding pipelines are communicated or not are arranged on the synchronous grouting pipe, the secondary grouting pipe 6 and the standby grouting pipe.
To reduce the length of the water glass tube, a water glass storage tank 9 and a water glass pump 10 are arranged on the connecting bridge 1 or the trailer 3, in this embodiment on the connecting bridge below the conveyor.
When the shield machine is used in a downhill section of a water-rich rock stratum, water in the rock stratum is accumulated near the shield machine under the action of gravity, so that the water pressure and the water gradient of accessories of the shield machine are increased, a plurality of hoop grouting holes 5a for installing three-way pipe grouting are uniformly formed in the annular direction on pipe pieces with 50-60 rings at intervals, the plurality of hoop grouting holes in the same pipe piece are arranged on the same cross section, and a small hoop which is arranged around the pipe pieces and is in a major arc is formed outside the corresponding pipe pieces after the three-way pipe grouting, so that the water coming from the rear is blocked by the small hoops. Each segment in a ring is usually provided with a hoop grouting hole in the center of the segment and spare grouting holes on two sides of the central hoop grouting hole.
Based on the structure for preventing shield segments from floating upwards, the concrete grouting method comprises the following steps:
the first step: when the next ring segment is still positioned in the shield tail of the shield machine, the shield machine stops tunneling, and the previous ring segment connected with the next ring segment is spliced in the shield tail, which is a construction step in the prior art.
And a second step of: after the former annular pipe slice is assembled, the shield machine continues the tunneling process, synchronously performs synchronous grouting through a synchronous grouting pipe, and simultaneously connects the three-way pipe on a secondary grouting hole above the pipe slice after the three-way pipe is separated from the tail of the shield, and injects mortar after mixing water glass solution. In the process, the water glass solution is prepared from water glass and water according to a volume ratio of 1:1 and then is stored in a water glass storage box, meanwhile, the volume ratio between the water glass solution and mortar is based on a range of 1:10 to 1:15, and flow sensors are correspondingly arranged on the standby grouting pipe, the synchronous grouting pipe and the secondary grouting pipe for conveniently controlling the volume injected in each grouting pipe.
And a third step of: the steps of the first step and the second step are repeated in sequence, and the three-way pipe is connected after one ring of pipe pieces are needed to be separated when being connected, so that the three-way pipe is connected with grouting holes in the corresponding pipe pieces conveniently, and the three-way pipe is needed to be taken down through manual movement and moved to the next position to be connected with the grouting holes after grouting is completed. When the three-way pipe is moved each time, the three-way pipe is cleaned, so that the mortar after the residual water glass solution is mixed is prevented from being solidified, and the next use is influenced.
After 50-60 rings are constructed, a plurality of hoop grouting holes 5a with the same cross section are arranged on the pipe piece, and then the three-way pipe is connected to the hoop grouting holes in a certain sequence and injected with mortar mixed with water glass solution, so that a hoop which is used for blocking water coming from the rear part and is in a major arc can be formed outside the pipe piece. In order to reduce the grouting time of the three-way pipe on the same pipe piece, the pipe piece provided with the hoop grouting holes and the pipe piece provided with the secondary grouting holes are preferably not the same ring pipe piece.
In the prior art, the conventional mortar has the following proportions: 80-150 parts of cement, 300-400 parts of fly ash, 50-100 parts of bentonite, 600-800 parts of sand and 350-400 parts of water, in the application, because the mortar in a mortar tank needs to be supplied with the mortar during synchronous grouting and the mortar during secondary grouting at the same time, the ratio is optimized, and the following ratio is obtained: 200-220 parts of cement, 300-400 parts of silica fume, 50-100 parts of bentonite, 900-1050 parts of sand and 350-400 parts of water. The fly ash is changed into silica powder, so that hydrophilic groups are added on the premise of not changing the fluidity and strength of the mortar, and the mortar can be used in a water-rich bottom layer. Meanwhile, the content of cement and sand is increased, and the cement content is increased to enable the mortar and the water glass solution to react better, so that the mortar and the water glass solution can be quickly solidified after being mixed in the three-way pipe and injected to the back of the pipe piece, thereby preventing the pipe piece from floating upwards and forming small hoops; the sand content is increased, the fluidity of the mortar is reduced on the premise of ensuring that the mortar can be normally injected, the mortar injected into the three-way pipe is ensured not to be lost greatly in the water-rich environment, and the mortar can better react with the water glass solution. Because the sand amount is larger in the proportion of the mortar in the embodiment, after the mortar is injected, the part with heavier components in the mortar can be more sunk into the bottom of the duct piece under the action of gravity, the fluidity of the bottom is reduced, and the water blocking of the bottom can be realized, so that the hoop grouting holes at the bottom are not subjected to grouting.
Fourth step: and repeating the third step until grouting construction of all the segments is completed.
Claims (4)
1. Prevent shield and construct section of jurisdiction come-up grouting structure, including being located connecting bridge (1) at shield tail rear, be provided with on connecting bridge (1) and be used for transporting conveyer (2) that dregs were carried out, and be provided with trailer (3) at connecting bridge (1) rear, be provided with synchronous grouting system (4) in trailer (3), be provided with grouting tank in synchronous grouting system (4), its characterized in that: still be provided with synchronous grouting pipe and secondary grouting pipe (6) in synchronous grouting system (4), and synchronous grouting pipe and the one end of secondary grouting pipe (6) all are connected with the slip casting jar, the other end of secondary grouting pipe (6) is provided with three-way pipe (7) with section of jurisdiction secondary grouting hole threaded connection, the other end of three-way pipe (7) is provided with water glass pipe (8) that are used for pouring into after the water glass solution mixes, the other end of water glass pipe (8) is provided with water glass bin (9) that hold water glass solution, still be provided with water glass pump (10) on water glass pipe (8), water glass bin (9) and water glass pump (10) set up on connecting bridge (1) or trailer (3), synchronous grouting pipe is used for pouring into mortar to the upper and lower left and right sides of every ring segment, three-way pipe (7) are used for pouring into the mortar after the water glass solution of mixing to the section of jurisdiction top after every interval.
2. The structure for preventing floating grouting of shield segments according to claim 1, wherein: ball valves for controlling whether corresponding pipelines are communicated or not are arranged on the synchronous grouting pipe and the secondary grouting pipe (6).
3. The structure for preventing floating grouting of shield segments according to claim 1, wherein: the pipe piece behind every interval a plurality of rings is evenly provided with a plurality of hoop grouting holes for installing the three-way pipe (7) along the hoop, and a plurality of hoop grouting holes on the same ring pipe piece are arranged on the same cross section.
4. The shield segment floating grouting prevention structure according to claim 3, wherein: and a 50-60 ring segment (5) is arranged between any two adjacent segments provided with a plurality of hoop grouting holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320169566.1U CN219045419U (en) | 2023-02-09 | 2023-02-09 | Prevent shield and construct section of jurisdiction come-up slip casting structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320169566.1U CN219045419U (en) | 2023-02-09 | 2023-02-09 | Prevent shield and construct section of jurisdiction come-up slip casting structure |
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| Publication Number | Publication Date |
|---|---|
| CN219045419U true CN219045419U (en) | 2023-05-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320169566.1U Active CN219045419U (en) | 2023-02-09 | 2023-02-09 | Prevent shield and construct section of jurisdiction come-up slip casting structure |
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| CN (1) | CN219045419U (en) |
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2023
- 2023-02-09 CN CN202320169566.1U patent/CN219045419U/en active Active
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