CN110744677A - Prefabricated built-in light filling body concrete segment and prefabricating method - Google Patents
Prefabricated built-in light filling body concrete segment and prefabricating method Download PDFInfo
- Publication number
- CN110744677A CN110744677A CN201910917994.6A CN201910917994A CN110744677A CN 110744677 A CN110744677 A CN 110744677A CN 201910917994 A CN201910917994 A CN 201910917994A CN 110744677 A CN110744677 A CN 110744677A
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- concrete
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- steel
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/0081—Embedding aggregates to obtain particular properties
- B28B23/0087—Lightweight aggregates for making lightweight articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/52—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/52—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement
- B28B1/523—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement containing metal fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
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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
- E21D11/08—Lining with building materials with preformed concrete slabs
Abstract
The invention relates to a prefabricated built-in light filling body concrete duct piece and a prefabricating method, which are applied to underground engineering constructed by adopting a prefabricated assembly method.
Description
Technical Field
The invention relates to the technical field of civil engineering, in particular to a prefabricated built-in light filling body concrete segment and a prefabricating method.
Background
Based on the characteristics of good mechanical property and economical efficiency of reinforced (fiber) concrete materials, the tunnel with the prefabricated assembled duct pieces as a bearing structure comprises rail transit, a highway tunnel, a railway tunnel, a municipal pipeline and the like, and the most commonly used duct pieces are reinforced (fiber) concrete duct pieces. Adopt the rib plate formula structure different with the steel-pipe piece, steel (fibre) reinforced concrete section of jurisdiction generally is that the entity is whole to water to it is great to cause the section of jurisdiction dead weight, assembles and receives great restriction with the section of jurisdiction size, and then causes section of jurisdiction ring and unit length tunnel section of jurisdiction seam numerous, not only influences the structure atress, moreover because the seam is numerous, has increased the risk of operation in-process tunnel percolating water, consequently the tunnel is assembled and is needed to optimize the improvement with steel (fibre) reinforced concrete section of jurisdiction urgently. Meanwhile, concrete cracks generated in the concrete structure construction and operation process can reduce the bearing capacity of the segment structure and influence the durability of the segment structure. The tunnel segment structure has large reinforcement amount, and the segment pouring is difficult to cause.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a prefabricated built-in lightweight filling body concrete segment and a prefabricating method.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a prefabricated built-in light filling body concrete section of jurisdiction, is applied to the underground works who adopts the construction of prefabricated concatenation method, and this section of jurisdiction includes section of jurisdiction skeleton, sets up the light filling body and the fashioned section of jurisdiction main part of layering casting concrete in the section of jurisdiction skeleton, the light filling body set up along section of jurisdiction skeleton extending direction to fix through the couple on the section of jurisdiction skeleton.
The duct piece main body is made of steel/fiber reinforced concrete, fiber steel/fiber reinforced concrete or fiber concrete, wherein steel/fiber bars in the steel/fiber reinforced concrete duct piece main body and the fiber steel/fiber reinforced concrete duct piece main body are duct piece stress steel/fiber bars, and steel/fiber bars in the fiber concrete duct piece main body are construction steel/fiber bars for fixing the light filling body through hooks.
The prefabricated segment framework is composed of a plurality of main reinforcements and a plurality of annular stirrups bound between the adjacent main reinforcements, and the light filling body is arranged in a space formed by surrounding the main reinforcements and the stirrups.
The fixed position of the light filling body avoids the segment embedded part.
The volume range of the light filling body accounts for 20-40% of the tube sheet, and the distance from the outer surface of the light filling body to the outer boundary of the tube sheet meets the requirements of tube sheet stress and the thickness of a steel bar protection layer.
The light filling body is a porous medium structure with a streamline outer surface, and the density of the light filling body is smaller than the material density of the duct piece main body.
When the brittle material is used as the built-in material of the light-weight filling body, the toughness material is coated outside the built-in material, and the flexibility of the built-in brittle material is ensured.
The fiber doped in the concrete formed by the cast segment main body adopts steel fiber and synthetic fiber, the steel fiber is carbon steel fiber, low alloy steel fiber or stainless steel fiber, and the synthetic fiber is polyacrylonitrile fiber, polypropylene fiber, polyamide fiber or polyvinyl alcohol fiber.
The duct piece framework material is a steel bar or a fiber bar.
A prefabricating method for prefabricating a concrete segment with a built-in light filling body comprises the following steps:
1) binding a segment framework;
2) placing a light filling body at a set position in the process of binding the duct piece framework;
3) the light filling body is accurately positioned by the hook, so that the bearing capacity and the durability of the duct piece cannot be influenced by the placement of the light filling body;
4) pouring and prefabricating the concrete segment with the built-in light filler by adopting commercial concrete;
5) and demolding and maintaining the built-in light filler concrete segment.
Compared with the prior art, the invention has the following advantages:
the invention provides a prefabricated built-in lightweight filler concrete segment which is obtained by placing a lightweight filler in a concrete segment to replace concrete; the bearing capacity and the durability of the concrete pipe sheet ring cannot be influenced by the built-in light filling body through the accurate positioning of the built-in light filling body; the method can reduce the self weight of the duct piece, increase the size of the prefabricated duct piece, improve the convenience of duct piece construction, effectively improve the construction efficiency, save raw materials, save the construction cost, reduce the resource loss, realize green construction and reduce the environmental influence; along with the increase of the load that the increase of tunnel excavation section arouses, section of jurisdiction thickness will also constantly increase to research and development built-in light filling body concrete section of jurisdiction has important theoretical meaning and practical value.
Drawings
Fig. 1 is an elevation view of a lightweight filler concrete segment.
Fig. 2 is a cross-sectional view of 1-1 in fig. 1.
Fig. 3 is a cross-sectional view of 2-2 in fig. 1.
Fig. 4 is a cross-sectional view of 3-3 of fig. 1.
Fig. 5 is a cross-sectional view of 4-4 of fig. 1.
Fig. 6 is a cross-sectional view of 5-5 of fig. 1.
Fig. 7 is a cross-sectional view of 6-6 of fig. 1.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Examples
The invention provides a prefabricated built-in light weight filling body concrete segment and a prefabricating method, wherein the prefabricated built-in light weight filling body concrete segment can be applied to underground engineering constructed by adopting a prefabricating and assembling method, and the prefabricated built-in light weight filling body concrete segment comprises but is not limited to shield tunnels, assembled ring-type pipe-jacking tunnels, prefabricated and assembled secondary linings by a drilling and blasting method, underground pipe galleries, prefabricated and assembled underground engineering, underground complex and the like.
The structure of the prefabricated built-in light weight filler concrete segment is shown in figures 1-7, the prefabricated built-in light weight filler concrete segment comprises a segment framework, a light weight filler arranged in the segment framework and a segment main body formed by pouring concrete, and the light weight filler is fixed through a hook on the segment framework.
The prefabricated built-in light filling body concrete segment can be steel (fiber) concrete, fiber steel (fiber) concrete or fiber concrete; wherein the reinforced concrete segment adopts a classic steel (fiber) bar and concrete mechanics calculation mode; the fiber reinforced concrete (fiber) segment takes the joint stress of the fiber and the steel (fiber) rib into consideration, so that the steel (fiber) rib configuration amount of the segment can be effectively reduced; the fiber concrete segment completely adopts fiber to replace steel (fiber) ribs.
According to the stress characteristics of the structure of the duct piece, a light filling body is arranged in the duct piece, and the light filling body is fixed on a duct piece steel (fiber) rib framework by a hook; wherein the steel (fiber) bars in the reinforced concrete segment and the fiber reinforced (fiber) reinforced concrete segment are segment stress steel (fiber) bars, and the steel (fiber) bars in the fiber reinforced concrete segment are construction steel (fiber) bars for positioning the light filling body.
The distance from the boundary of the built-in light filling body to the outer boundary of the corresponding segment meets the requirements of segment stress and the thickness of a steel bar protection layer, the volume of the segment occupied by the built-in light filling body can reach 20% -40%, the consumption of concrete can be effectively reduced, the appearance and the positioning of the built-in light filling body ensure that the bearing capacity of the segment is not obviously influenced, the streamline form which is convenient for concrete pouring is adopted, the thickness of the protection layer of the steel bar of the segment is ensured by the positioning of the built-in light filling body, the durability of the structure of the segment is not influenced, the internal structural characteristics of the segment need to be considered by the appearance of the built-in.
The built-in light filling body is made of porous media, the material source is reliable, the cost performance is high, and the density is far less than that of a concrete material. When the built-in light filling body is made of brittle materials, the toughness materials are coated outside, so that the flexibility of the built-in filling body is ensured, and adverse effects on the environment in the tunnel operation process cannot be caused.
The brittle materials adopted in the embodiment refer to bricks, tiles, stones, concrete, glass and the like, and have the characteristics of high compressive strength, difficulty in bearing tensile force, no plastic deformation after stress and brittle fracture when being damaged; the tough material is a plastic material, and has the characteristic of high tensile strength, but can generate plastic deformation after being stressed, such as: metal materials, rubber, polymer materials, and the like.
The invention increases the concrete heat dissipation area through the built-in light filling body, reduces the concrete volume, thereby reducing the segment cracks possibly caused by the hydration heat of the large-volume concrete, obviously reduces the average density of the segments because of the built-in light filling body, increases the segment size by combining the construction capability of the current tunnel construction mechanical equipment, reduces the number of single-ring tunnel segments and tunnel segment joints of unit length, and reduces the water leakage risk of the tunnel joints.
The hook for positioning the built-in light filling body has enough strength and toughness, the built-in light filling body is ensured not to deviate in the concrete pouring process, and the segment framework can be made of materials meeting the stress requirements such as reinforcing steel bars and fiber bars.
The fiber doped in the poured concrete can adopt common non-toxic fiber in fiber concrete, such as steel fiber (including carbon steel fiber, low alloy steel fiber, stainless steel fiber and the like) and synthetic fiber (including polyacrylonitrile fiber, polypropylene fiber, polyamide fiber, polyvinyl alcohol fiber and the like), and the fiber doped in the concrete needs to consider the stress requirement besides the control requirement of the segment concrete crack, correspondingly reduces the reinforcement amount of a steel (fiber) rib framework and facilitates the binding of steel (fiber) ribs.
The prefabricating method of the prefabricated built-in light filling body concrete segment is realized by the following steps:
(1) binding a segment steel (fiber) rib framework;
(2) a built-in light filling body is arranged in the process of binding the pipe piece steel (fiber) rib framework;
(3) the hook of the built-in light weight filling body is accurately positioned, so that the bearing capacity and the durability of the duct piece cannot be influenced by the built-in light weight filling body;
(4) prefabricating a concrete segment with a built-in light filling body by using commercial concrete;
(5) and (5) demolding, maintaining and prefabricating the concrete pipe piece with the built-in light filler.
Claims (10)
1. The utility model provides a prefabricated built-in light packing body concrete section of jurisdiction, is applied to the underground works who adopts the construction of prefabricated concatenation method, its characterized in that, this section of jurisdiction include section of jurisdiction skeleton, set up the light packing body and the fashioned section of jurisdiction main part of layering casting concrete in the section of jurisdiction skeleton, the light packing body set up along section of jurisdiction skeleton extending direction to fix through the couple on the section of jurisdiction skeleton.
2. The prefabricated built-in lightweight filler concrete duct piece according to claim 1, wherein the duct piece body material is steel/fiber reinforced concrete, fiber steel/fiber reinforced concrete or fiber concrete, wherein the steel/fiber bars in the steel/fiber reinforced concrete duct piece body and the fiber steel/fiber reinforced concrete duct piece body are duct piece stress steel/fiber bars, and the steel/fiber bars in the fiber concrete duct piece body are construction steel/fiber bars for fixing the lightweight filler by hooks.
3. The prefabricated built-in lightweight filler concrete segment as claimed in claim 1, wherein said prefabricated segment frame is composed of a plurality of main bars and a plurality of annular stirrups bound between adjacent main bars, and said lightweight filler is disposed in a space surrounded by the plurality of main bars and the stirrups.
4. The prefabricated built-in lightweight filling body concrete segment as claimed in claim 3, wherein the fixed position of the lightweight filling body is free from a segment embedded part.
5. The prefabricated built-in lightweight filling body concrete segment as claimed in claim 1, wherein the lightweight filling body accounts for 20-40% of the volume of the segment, and the distance from the outer surface of the lightweight filling body to the outer boundary of the segment meets the requirements of segment stress and the thickness of a steel bar protection layer.
6. The prefabricated built-in lightweight filler concrete segment as claimed in claim 1, wherein the lightweight filler is a porous medium structure with a streamlined outer surface, and the density of the porous medium structure is less than the material density of the segment main body.
7. The prefabricated lightweight infill-concrete duct piece as claimed in claim 6, wherein when a brittle material is used as the infill material of the lightweight infill, the infill material is coated with a tough material and flexibility of the infill material is ensured.
8. The prefabricated built-in lightweight filler concrete segment according to claim 2, wherein the fibers doped in the concrete formed by casting the segment body are steel fibers and synthetic fibers, the steel fibers are carbon steel fibers, low alloy steel fibers or stainless steel fibers, and the synthetic fibers are polyacrylonitrile fibers, polypropylene fibers, polyamide fibers or polyvinyl alcohol fibers.
9. The prefabricated lightweight built-in concrete segment as recited in claim 1, wherein said segment skeleton material is steel or fiber reinforcement.
10. A prefabricating method for prefabricating a concrete segment with a built-in light filling body is characterized by comprising the following steps:
1) binding a segment framework;
2) placing a light filling body at a set position in the process of binding the duct piece framework;
3) the light filling body is accurately positioned by the hook, so that the bearing capacity and the durability of the duct piece cannot be influenced by the placement of the light filling body;
4) pouring and prefabricating the concrete segment with the built-in light filler by adopting commercial concrete;
5) and demolding and maintaining the built-in light filler concrete segment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910917994.6A CN110744677A (en) | 2019-09-26 | 2019-09-26 | Prefabricated built-in light filling body concrete segment and prefabricating method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910917994.6A CN110744677A (en) | 2019-09-26 | 2019-09-26 | Prefabricated built-in light filling body concrete segment and prefabricating method |
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| CN110744677A true CN110744677A (en) | 2020-02-04 |
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| CN201910917994.6A Pending CN110744677A (en) | 2019-09-26 | 2019-09-26 | Prefabricated built-in light filling body concrete segment and prefabricating method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112627828A (en) * | 2020-11-05 | 2021-04-09 | 中煤科工集团北京华宇工程有限公司 | Mine well wall structure and construction method thereof |
| CN115306431A (en) * | 2022-10-10 | 2022-11-08 | 湖南大学 | Closed-cavity thin-wall ultra-high-performance concrete shield tunnel segment |
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2019
- 2019-09-26 CN CN201910917994.6A patent/CN110744677A/en active Pending
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112627828A (en) * | 2020-11-05 | 2021-04-09 | 中煤科工集团北京华宇工程有限公司 | Mine well wall structure and construction method thereof |
| CN115306431A (en) * | 2022-10-10 | 2022-11-08 | 湖南大学 | Closed-cavity thin-wall ultra-high-performance concrete shield tunnel segment |
| CN115306431B (en) * | 2022-10-10 | 2023-01-20 | 湖南大学 | Closed-cavity thin-wall ultra-high-performance concrete shield tunnel segment |
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Application publication date: 20200204 |