CN110608052A - Tunnel segment based on high-performance cement-based composite material and construction method thereof - Google Patents
Tunnel segment based on high-performance cement-based composite material and construction method thereof Download PDFInfo
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- CN110608052A CN110608052A CN201911006042.5A CN201911006042A CN110608052A CN 110608052 A CN110608052 A CN 110608052A CN 201911006042 A CN201911006042 A CN 201911006042A CN 110608052 A CN110608052 A CN 110608052A
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- 239000004568 cement Substances 0.000 title claims abstract description 53
- 239000002131 composite material Substances 0.000 title claims abstract description 39
- 238000010276 construction Methods 0.000 title claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 26
- 239000010959 steel Substances 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- 239000011440 grout Substances 0.000 claims description 24
- 239000003638 chemical reducing agent Substances 0.000 claims description 12
- 239000000835 fiber Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 8
- 239000006004 Quartz sand Substances 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 7
- 239000002002 slurry Substances 0.000 claims description 7
- 239000010881 fly ash Substances 0.000 claims description 6
- 230000002787 reinforcement Effects 0.000 claims description 6
- 229910021487 silica fume Inorganic materials 0.000 claims description 6
- 238000004873 anchoring Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 3
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000003487 anti-permeability effect Effects 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
-
- 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
- E21D11/08—Lining with building materials with preformed concrete slabs
- E21D11/083—Methods or devices for joining adjacent concrete segments
-
- 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
- E21D11/08—Lining with building materials with preformed concrete slabs
- E21D11/086—Methods of making concrete lining segments
-
- 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
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
- E21D11/381—Setting apparatus or devices
-
- 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
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
- E21D11/385—Sealing means positioned between adjacent lining members
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a duct piece based on a high-performance cement-based composite material and a construction method thereof. The invention has the advantages that the segment steel bars are reliably anchored and then poured with the high-strength high-performance cement-based composite material, so that the overall performance and the seismic performance of the segment are obviously improved.
Description
Technical Field
The invention relates to the technical field of high-performance cement-based composite materials and tunnel segments, in particular to a tunnel segment based on a high-performance cement-based composite material and a construction method thereof.
Background
In recent years, due to the rapid development of urban rail transit and the acceleration of urbanization process, the demand of China on underground space resources is increasing, and the shield tunnel segment construction technology is widely adopted in urban subway tunnels and large tunnel projects at present due to the advantages of high mechanization degree, high construction speed, small environmental influence and the like. The shield method tunnel is a structure formed by assembling a plurality of prefabricated pipe pieces on site through bolt connection, and due to the bolt connection, the water leakage phenomenon easily occurs at the joint (circular seam and longitudinal seam) and the bolt hole position formed between the pipe pieces, and in order to prevent the underground water from leaking into the pipe pieces, a rubber waterproof sealing gasket is usually arranged at the joint of the pipe pieces, a water-swelling rubber sealing ring is arranged at the bolt hole position, and grouting, caulking treatment and the like are performed.
The bolt connection is basically manual operation, so that a large amount of time and labor are consumed, the construction speed is low, and the construction period is long. After the bolt adopts waterproof rubber circle and carries out slip casting and caulking treatment among the actual engineering, the phenomenon that appears the percolating water still ubiquitous, in case the seepage appears in the section of jurisdiction, will seriously threaten safety and operation in the tunnel, will cause immeasurable life and property loss especially to electric power tunnel and subway tunnel.
Application number 201610708866.7 discloses a shield method tunnel segment bolt hole waterproof structure and a construction method, waterproof pressure of bolt holes is improved through two waterproof gaskets, and the structure has better durability, but the construction of the connection form is complex, and the aging problem of the waterproof gaskets cannot be avoided.
At present, most of domestic bolt holes are enabled to enhance the waterproof capacity through additional measures, and the bolt connection cannot be avoided. Therefore, the problem to be solved at present is to find a novel tunnel segment connection mode and a construction method which are not connected through bolts, have convenient construction, good anti-permeability performance and durability, reliable connection and low manufacturing cost and can effectively solve the waterproof problem of the bolt holes.
Disclosure of Invention
The invention aims to provide a tunnel segment based on a high-performance cement-based composite material, aiming at the defects in the prior art.
The invention also aims to provide a tunnel segment splicing construction method based on the high-performance cement-based composite material.
The purpose of the invention is realized by the following technical scheme:
the utility model provides a tunnel segment based on high performance cement based composite, it is a plurality of the tunnel segment is assembled and is constituted round tunnel ring, both ends confined recess has been seted up respectively to tunnel segment both sides limit, laid a set of embedded bar in the recess, embedded bar stretch out in outside the recess, when the tunnel is assembled, the corresponding lock of recess of two adjacent tunnel segments forms confined segment spread groove, and grout hole and grout outlet have been seted up to the terminal surface of segment spread groove, through grout outlet and grout outlet to pour high performance cement based composite in the segment spread groove, embedded bar carries out dislocation overlap joint in the segment spread groove.
In a further design scheme of the invention, the groove is a V-shaped groove, a U-shaped groove or an arc-shaped groove.
In a further design scheme of the invention, the diameter of the embedded steel bar is not less than 6mm, and the extending anchoring length is not less than 5 times of the diameter of the embedded steel bar.
In a further design scheme of the invention, the grouting hole is positioned at the lowest point of the segment connecting groove, and the grout outlet hole is positioned at the highest point of the segment connecting groove.
In a further design scheme of the invention, a layer of water stop pad is adhered to the periphery of the groove openings of the two tunnel pipe pieces which are buckled and spliced with each other.
In a further design scheme of the invention, the high-performance cement-based composite material comprises the following components in percentage by weight: fly ash: silica fume: quartz sand: water: water reducing agent: steel fiber =690:240:172:187.34:991.8:22.04:120, wherein the water reducing agent content is 2.0%, the steel fiber volume content is 1.5%, the sand-cement ratio is 0.9, and the water-cement ratio is 0.17.
The construction method of the tunnel segment based on the high-performance cement-based composite material comprises the following specific steps:
step one, designing and manufacturing a tunnel duct piece mold, placing a reinforcement cage in the tunnel duct piece mold, reserving reinforcement extending out of a groove, and adhering a thin water stop pad around the opening of the groove.
And step two, sequentially assembling the tunnel pipe pieces from the lower right to the upper right, correspondingly buckling and tightly contacting groove openings of the tunnel pipe pieces to form a closed pipe piece connecting groove, forming a grouting hole and a grout outlet at one end of the pipe piece connecting groove, wherein the grouting hole is arranged at the lowest position, and the grout outlet is arranged at the highest position.
And step three, injecting the high-performance cement-based composite material into the segment connecting groove from the grouting hole by adopting a high-pressure grouting machine, stopping grouting when slurry of the high-performance cement-based composite material flows out from the upper slurry outlet hole, blocking the open hole part in time, and splicing the rest tunnel segments by using the same method.
In a further design scheme of the invention, the high-performance cement-based composite material comprises the following components in percentage by weight: fly ash: silica fume: quartz sand: water: water reducing agent: steel fiber =690:240:172:187.34:991.8:22.04:120, wherein the water reducing agent content is 2.0%, the steel fiber volume content is 1.5%, the sand-cement ratio is 0.9, and the water-cement ratio is 0.17.
The invention has the following outstanding advantages:
the invention does not need bolt connection, and overcomes the problems of large time and labor consumption, low construction speed, long construction period and the like because the bolt connection needs manual tightening. The problems that water is easy to leak from a bolt hole, a bolt water-stopping sealing ring is easy to age, the difficulty of later maintenance is high and the like in bolt connection are solved.
The high-performance cement-based composite material has the characteristics of high toughness, high durability and low permeability, and the impermeability and the durability of the segment joints are greatly improved by pouring the high-performance cement-based composite material for connection, so that the waterproof effect is good, and the later maintenance cost is low.
According to the invention, the steel bars are connected in a staggered overlapping manner, accurate positioning is not needed, construction is convenient, and the duct piece steel bars are reliably anchored and then poured with the high-strength high-performance cement-based composite material, so that the overall performance and the anti-seismic performance of the duct piece are obviously improved.
Drawings
FIG. 1 is a schematic structural diagram of a tunnel segment based on a high-performance cement-based composite material in an embodiment;
FIG. 2 is a bottom sectional view of a tunnel segment in an embodiment;
FIG. 3 is a ring diagram of tunnel segments assembled in the embodiment;
fig. 4 is a schematic view of the opening on the segment connecting groove at different splicing positions in the embodiment
In the figure, 1-embedded steel bar, 4-groove, 5-tunnel segment, 7-grouting hole, 8-grout outlet, 9-steel bar cage, 10-grouting hole, 11-grout outlet, 12-tunnel segment, 13-tunnel segment, 14-tunnel segment, 15-segment connecting groove, 16-segment connecting groove, 17-segment connecting groove, 18-grouting hole, and 19-grout outlet.
Detailed Description
The invention is further explained below with reference to the drawings and examples.
Examples
Referring to the attached figure 1, a tunnel segment based on a high-performance cement-based composite material is formed by splicing a plurality of tunnel segments 5 to form a circle of tunnel ring, two side edges of each tunnel segment are respectively provided with a V-shaped groove 4 with two closed ends, a group of embedded steel bars 1 with the diameter not less than 6mm are distributed in the grooves 4, the embedded steel bars 1 extend out of the grooves 4, and the extending anchoring length is not less than 5 times of the diameter of the embedded steel bars; the extended anchoring length refers to the portion of the precast segment that extends out of the interior of the precast segment and is not encased by concrete. When the tunnel is assembled, the openings of the grooves 4 of the two adjacent tunnel segments 5 are correspondingly buckled to form a closed segment connecting groove, and a water stop pad is adhered around the groove openings of the two tunnel segments which are buckled and spliced. The end face of the segment connecting groove is provided with a grouting hole and a grout outlet, the grouting hole is located at the lowest point of the segment connecting groove, and the grout outlet is located at the highest point of the segment connecting groove. High-performance cement-based composite materials are poured into the segment connecting grooves through the grouting holes and the grout outlet holes, and embedded steel bars in the segment connecting grooves are connected in a staggered lap joint mode. The staggered lap joint connection is the meaning that the reinforcing steel bars are mutually staggered, staggered and not contacted. The purpose of this is to eliminate the need for precise positioning between the bars, which also takes advantage of the confined space. The high-performance cement-based composite material comprises the following components in parts by mass: fly ash: silica fume: quartz sand: water: water reducing agent: steel fiber =690:240:172:187.34:991.8:22.04:120, wherein the water reducing agent content is 2.0%, the steel fiber volume content is 1.5% (volume ratio), the sand-cement ratio is 0.9 (ratio of quartz sand mass to all the gelled materials mass), and the water-cement ratio is 0.17 (ratio of water mass to all the gelled materials mass).
When the tunnel duct piece is used for assembly construction, bolt connection is not needed, the openings of the grooves of two adjacent tunnel duct pieces are correspondingly buckled to form a closed rhombic duct piece connecting groove, embedded steel bars in the grooves can be connected in a staggered lap joint mode, and high-performance cement-based composite materials are injected into the grooves for connection. Taking 3 tunnel segments to form a ring of tunnel rings as an example, referring to fig. 2-4, the method specifically comprises the following steps:
step one, designing and manufacturing a tunnel segment mould, placing a reinforcement cage 9 in the tunnel segment mould, reserving a reinforcement 1 extending out of a groove 4, and pasting a thin water stop pad around the opening of the groove 4 to ensure that the contact part of the tunnel segment has a better waterproof effect. Tunnel segment 12, tunnel segment 13 and tunnel segment 14 are obtained.
And step two, sequentially assembling the tunnel pipe pieces from bottom to top, assembling the tunnel pipe piece 12 and the tunnel pipe piece 13 at the bottom, after the tunnel pipe pieces are assembled and tightly connected, forming a rhombic pipe piece connecting groove 15 in the contact part, forming two grouting holes 7 and a grout outlet hole 8 on one side of the pipe piece connecting groove 15, wherein the grouting hole 7 is at the lowest position, and the grout outlet hole 8 is at the highest position. After the tunnel segment 12 and the tunnel segment 13 are assembled, the tunnel segment 14 is assembled by the same method, the tunnel segment 14 is respectively buckled with the tunnel segment 12 and the tunnel segment 13 to form a rhombic segment connecting groove 17 and a rhombic segment connecting groove 16, a grouting hole 10 and a grout outlet hole 11 are formed in one end of the segment connecting groove 16, and a grouting hole 18 and a grout outlet hole 19 are formed in one end of the segment connecting groove 17.
And step three, injecting the high-performance cement-based composite material into the segment connecting grooves 15 from the grouting holes 7 by using a high-pressure grouting machine, stopping grouting when slurry of the high-performance cement-based composite material flows out of the upper slurry outlet 8, blocking the grouting holes 7 and the slurry outlet 8 in time, and sequentially filling the rest segment connecting grooves by using the same method.
The high-performance cement-based composite material comprises the following components in percentage by weight: fly ash: silica fume: quartz sand: water: water reducing agent: steel fiber =690:240:172:187.34:991.8:22.04:120, wherein the water reducing agent content is 2.0%, the steel fiber volume content is 1.5%, the sand-cement ratio is 0.9, and the water-cement ratio is 0.17.
The above are preferred embodiments of the present invention, and all changes made according to the technical scheme of the present invention that produce functional effects do not exceed the scope of the technical scheme of the present invention belong to the protection scope of the present invention.
Claims (8)
1. The utility model provides a tunnel segment based on high performance cement-based composite, it is a plurality of the tunnel segment is assembled and is constituted round tunnel ring, its characterized in that, both ends confined recess has been seted up respectively to tunnel segment both sides limit, lay a set of embedded bar in the recess, embedded bar stretch out in outside the recess, when the tunnel is assembled, the corresponding lock of recess of two adjacent tunnel segments forms confined segment spread groove, and grout hole and grout outlet have been seted up to the terminal surface of segment spread groove, through grout hole and grout outlet to pour high performance cement-based composite in the segment spread groove, embedded bar carries out dislocation overlap joint in the segment spread groove.
2. The high performance cement-based composite based tunnel segment of claim 1, wherein the grooves are V-shaped grooves or U-shaped grooves or arc-shaped grooves.
3. The high-performance cement-based composite material-based tunnel segment as claimed in claim 1, wherein the diameter of the embedded steel bars is not less than 6mm, and the extended anchoring length is not less than 5 times the diameter of the embedded steel bars.
4. The high performance cement-based composite material-based tunnel segment of claim 1, wherein said grouting holes are located at the lowest point of segment connecting grooves, and said grout outlet holes are located at the highest point of segment connecting grooves.
5. The tunnel segment based on the high-performance cement-based composite material as claimed in claim 1, wherein a water stop pad is adhered around the groove openings of the two tunnel segments which are buckled and spliced.
6. The high performance cement-based composite material-based tunnel segment of claim 1, wherein the high performance cement-based composite material is cement: fly ash: silica fume: quartz sand: water: water reducing agent: steel fiber =690:240:172:187.34:991.8:22.04:120, wherein the water reducing agent content is 2.0%, the steel fiber volume content is 1.5%, the sand-cement ratio is 0.9, and the water-cement ratio is 0.17.
7. A tunnel segment assembling construction method based on a high-performance cement-based composite material is characterized by comprising the following specific steps:
step one, designing and manufacturing a tunnel duct piece mold, placing a reinforcement cage in the tunnel duct piece mold, reserving reinforcement extending out of a groove, and sticking a thin water stop pad around the opening of the groove;
step two, sequentially assembling tunnel pipe pieces from the right bottom to the top, correspondingly buckling groove openings of the tunnel pipe pieces, tightly contacting the groove openings, forming a closed pipe piece connecting groove, forming a grouting hole and a grout outlet at one end of the pipe piece connecting groove, wherein the grouting hole is arranged at the lowest position, and the grout outlet is arranged at the highest position;
and step three, injecting the high-performance cement-based composite material into the segment connecting groove from the grouting hole by adopting a high-pressure grouting machine, stopping grouting when slurry of the high-performance cement-based composite material flows out from the upper slurry outlet hole, blocking the open hole part in time, and splicing the rest tunnel segments by using the same method.
8. The tunnel segment assembling construction method based on the high-performance cement-based composite material as claimed in claim 7, wherein the high-performance cement-based composite material is prepared from cement: fly ash: silica fume: quartz sand: water: water reducing agent: steel fiber =690:240:172:187.34:991.8:22.04:120, wherein the water reducing agent content is 2.0%, the steel fiber volume content is 1.5%, the sand-cement ratio is 0.9, and the water-cement ratio is 0.17.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911006042.5A CN110608052A (en) | 2019-10-22 | 2019-10-22 | Tunnel segment based on high-performance cement-based composite material and construction method thereof |
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| CN201911006042.5A CN110608052A (en) | 2019-10-22 | 2019-10-22 | Tunnel segment based on high-performance cement-based composite material and construction method thereof |
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| CN114198118A (en) * | 2021-12-25 | 2022-03-18 | 中铁工程装备集团有限公司 | Underground engineering node processing structure and construction method thereof |
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