阅读说明：本技术 叠合预制双层管片结构 (Superposed prefabricated double-layer duct piece structure ) 是由 杨博涵 张延年 回志峰 韩东 于 2021-08-26 设计创作，主要内容包括：本发明属于地下工程领域,特别是涉及一种叠合预制双层管片结构,包括相互连接的三个标准块、连接块A、连接块B、楔形顶块；管片包括UHPC保护层和普通混凝土层,管片间通过纵向预留的螺孔和管片上预留的安装孔连接,UHPC保护层和普通混凝土层为叠合式预制,预制过程中以UHPC保护层作为叠合板与浇筑于其上的普通混凝土层叠合后形成双层管片,UHPC保护层中配置受力钢筋和桁架钢筋网架确保弧形管片受力性能和层间连接可靠性,UHPC保护层外侧无需防水。本发明优点是采用叠合预制双层管片,加强UHPC层与混凝土层黏结的可靠性,避免由于UHPC材料初期自收缩引起的层间应力集中,节约材料,经济效果好,降低管片自重,方便运输,增强管片结构的抗渗和耐腐蚀性能。(The invention belongs to the field of underground engineering, and particularly relates to a superposed prefabricated double-layer duct piece structure which comprises three standard blocks, a connecting block A, a connecting block B and a wedge-shaped top block, wherein the three standard blocks, the connecting block A, the connecting block B and the wedge-shaped top block are mutually connected; the segment comprises a UHPC protective layer and a common concrete layer, the segments are connected through a longitudinally reserved screw hole and a reserved mounting hole in the segment, the UHPC protective layer and the common concrete layer are prefabricated in a superposed mode, the UHPC protective layer is used as a superposed slab in the prefabrication process, the superposed slab and the common concrete layer poured on the superposed slab form a double-layer segment, stressed steel bars and a truss steel bar net rack are arranged in the UHPC protective layer to ensure the stress performance and the interlayer connection reliability of the arc-shaped segment, and the outer side of the UHPC protective layer does not need to be waterproof. The invention has the advantages that the superposed prefabricated double-layer duct piece is adopted, the bonding reliability of the UHPC layer and the concrete layer is enhanced, the stress concentration between layers caused by the initial self-shrinkage of the UHPC material is avoided, the material is saved, the economic effect is good, the self weight of the duct piece is reduced, the transportation is convenient, and the anti-permeability and corrosion resistance of the duct piece structure are enhanced.)

1. The prefabricated double-deck section of jurisdiction of coincide structure, its characterized in that: the device comprises three standard blocks (1), a connecting block A (2), a connecting block B (3) and a wedge-shaped top block (4) which are connected with each other; the segment lining block is composed of an outer UHPC protective layer (5) and an inner common concrete layer (6); the UHPC protective layer (5) is tightly attached to the common concrete layer (6); screw holes (7) are uniformly distributed in the common concrete layer (6), and adjacent standard blocks (1), connecting blocks A (2), connecting blocks B (3) and wedge-shaped jacking blocks (4) are fixedly connected by connecting bolts penetrating through the screw holes (7); the UHPC protective layer (5) internally comprises stressed steel bars a (8) and partial truss steel bars (10), and the common concrete layer internally comprises stressed steel bars b (9) and partial truss steel bars (10); the UHPC protective layer (5) and the common concrete layer (6) are tightly connected together through a truss-stressed steel bar net rack formed by stressed steel bars a (8), stressed steel bars b (9) and truss steel bars (10).

2. The laminated prefabricated double-layer segment structure as claimed in claim 1, wherein: the arc center angle of the standard block (1) is 72 degrees, the arc center angles of the connecting block A (2) and the connecting block B (3) are 64.5 degrees, and the arc center angle of the wedge-shaped top block (4) is 15 degrees.

3. The laminated prefabricated double-layer segment structure as claimed in claim 1, wherein: mounting holes (11) are formed in the standard block (1), the connecting block A (2), the connecting block B (3) and the wedge-shaped top block (4), a connecting block A overlapping edge (2-1) is arranged on the outer side of the connecting block A (2), a connecting block B overlapping edge (3-1) is arranged on the outer side of the connecting block B (3), and a top block left overlapping edge (4-1) and a top block right overlapping edge (4-2) are arranged on two sides of the wedge-shaped top block (4); the angle shape of the connecting block A overlapping edge (2-1) corresponds to that of the top block left overlapping edge (4-1), and the angle shape of the connecting block B overlapping edge (3-1) corresponds to that of the top block right overlapping edge (4-2).

4. The laminated prefabricated double-layer segment structure as claimed in claim 1, wherein: the thickness of the UHPC protective layer (5) is less than or equal to that of the common concrete layer (6).

5. The laminated prefabricated double-layer segment structure as claimed in claim 1, wherein: waterproof sealing gaskets are arranged at the joint positions of the three standard blocks (1), the connecting block A (2), the connecting block B (3) and the wedge-shaped top block (4); and the outer side of the UHPC protective layer (5) is not subjected to additional waterproof treatment.

6. The laminated prefabricated double-layer segment structure as claimed in claim 1, wherein: when the reinforcing fiber added into the UHPC protective layer (5) is steel fiber, other steel bars are not configured except the stressed steel bar a (8) and the truss steel bar (10).

7. The laminated prefabricated double-layer segment structure as claimed in claim 1, wherein: the segments are in staggered joint and lap joint when being longitudinally connected, and the wedge-shaped jacking blocks (4) are always positioned on two sides of the central axis of the segment structure in the assembling process.

8. The laminated prefabricated double-layer segment structure as claimed in claim 1, wherein: the UHPC protective layer (5) and the common concrete layer (6) are both prefabricated components.

9. The laminated prefabricated double-layer segment structure as claimed in claim 8, wherein: the prefabrication method of the UHPC protective layer (5) and the common concrete layer (6) comprises the following steps: firstly, binding and connecting reinforcing steel bars in a UHPC protective layer, namely stressed reinforcing steel bars a (8) and truss reinforcing steel bars (10), wherein the two reinforcing steel bars are uniformly arranged at equal intervals along the length direction of the duct piece; after the steel bars are bound, pouring the ultra-high performance concrete in the UHPC protective layer, wherein a part of the truss steel bars (10) are exposed to the outer side of the UHPC protective layer (5) after pouring; performing high-temperature steam curing on the UHPC protective layer (5) for not less than 48h, wherein the temperature is controlled to be about 90 ℃, and the exposed truss steel bars are protected by wrapping waterproof films or spraying anti-corrosion materials properly in the steam curing process; monitoring shrinkage in the prefabrication process of the UHPC protective layer (5), after initial self-shrinkage of the ultra-high performance concrete poured by the UHPC protective layer (5) is basically finished and the strength meets the requirement, pouring a common concrete layer (6) in a superposition mode, wherein the UHPC protective layer (5) plays a role of superposing a bottom plate, correspondingly, the common concrete layer (6) is poured after side templates are erected on two sides of the UHPC protective layer, and a proper amount of expanding agent is added in the pouring process to control the shrinkage of the common concrete; and after pouring is finished, integral maintenance is carried out until the strength requirement is met, and the product can be delivered from a factory.

Technical Field

The invention belongs to the field of underground engineering, and particularly relates to a superposed prefabricated double-layer duct piece structure.

Background

A segment lining structure is frequently used in underground space engineering, and particularly, segment lining is mostly adopted when shield construction is adopted. With the rapid development of cities, the availability of overground spaces is lower and lower, and the development of underground spaces becomes a new trend of city construction. In recent years, subways and utility tunnel corridors are built in various domestic cities, tunnels are also frequently dug in the aspect of traffic to guarantee normal operation of the cities and the traffic, shield machines are used more and more, and then the utilization rate of segment linings is increased. The common concrete pipe piece has high anti-permeability requirements, and particularly in special regions where underground water and surrounding soil have corrosiveness and the like, the leakage of the common concrete pipe piece becomes a difficult problem in the construction and later maintenance operation processes. The seepage of tunnel section of jurisdiction is very common, and later stage repair reinforcement is more difficult, has very big harm to the suitability and the security of structure. The prior art mainly comprises measures of adding an anti-permeability additive into common concrete, and the like, but the effect is not ideal, or paving and spraying an additional waterproof layer cannot meet the requirement of long-period anti-permeability while increasing the workload and the working difficulty, and frequent maintenance and reinforcement are needed.

Ultra-High Performance Concrete (UHPC) originated in Denmark in the seventies of the last century, has been researched and developed for more than forty years so far, has also gained attention in various industries and started to be applied in recent years, and is called as the most innovative cement-based engineering material in the last thirty years. The concrete has the advantages of excellent mechanical property, impermeability, corrosion resistance, high durability and low carbon emission, and is far ahead of common concrete in the field of building materials. The UHPC can be named as an engineering material with the best durability, the mechanical property of the UHPC with proper reinforcement is close to that of a steel structure, and meanwhile, the UHPC has excellent wear resistance and anti-explosion performance. At present, domestic research and application are concentrated in the field of bridges, for example, steel-UHPC bridge structures are well developed in recent years, but the application in other fields is less, and one important reason is that the cost is overhigh.

Disclosure of Invention

In order to solve the technical problems, the invention provides a superposed prefabricated double-layer duct piece structure, which is mainly developed, enhances the bonding reliability of an interface between a UHPC layer and a concrete layer, avoids the interlayer stress concentration caused by initial self-shrinkage of the UHPC material, saves the UHPC material and steel bars with high manufacturing cost, has good economic effect and convenient construction, reduces the dead weight of the duct piece, facilitates transportation and enhances the impermeability and corrosion resistance of the duct piece structure.

The technical scheme adopted by the invention is as follows: the overlapped prefabricated double-layer duct piece structure comprises three standard blocks, a connecting block A, a connecting block B and a wedge-shaped top block which are connected with each other; the segment lining block consists of an outer UHPC protective layer and an inner common concrete layer; the UHPC protective layer is tightly attached to the common concrete layer; screw holes are uniformly distributed in the common concrete layer, and the adjacent standard block, the connecting block A, the connecting block B and the wedge-shaped jacking block are fixedly connected by penetrating through the screw holes through connecting bolts; the UHPC protective layer comprises a stressed steel bar a and a part of truss steel bars inside, and the common concrete layer comprises stressed steel bars b and a part of truss steel bars inside; the UHPC protective layer and the common concrete layer are tightly connected together through a truss-stressed steel bar net rack formed by the stressed steel bar a, the stressed steel bar b and truss steel bars.

Furthermore, the arc center angle of the standard block is 72 degrees, the arc center angles of the connecting block A and the connecting block B are 64.5 degrees, and the arc center angle of the wedge-shaped top block is 15 degrees.

Further, mounting holes are formed in the standard block, the connecting block A, the connecting block B and the wedge-shaped top block, a connecting block A overlapping edge is arranged on the outer side of the connecting block A, a connecting block B overlapping edge is arranged on the outer side of the connecting block B, and a top block left overlapping edge and a top block right overlapping edge are arranged on two sides of the wedge-shaped top block; the angle shape of the connecting block A overlapping edge corresponds to that of the top block left overlapping edge, and the angle shape of the connecting block B overlapping edge corresponds to that of the top block right overlapping edge;

further, the thickness of the UHPC protective layer is less than or equal to that of the common concrete layer;

furthermore, waterproof sealing gaskets are arranged at the joint positions of the three standard blocks, the connecting block A, the connecting block B and the wedge-shaped top block; the outer side of the UHPC protective layer is not subjected to additional waterproof treatment;

further, when the reinforcing fiber added into the UHPC protective layer is steel fiber, other steel bars are not configured in the UHPC protective layer except the stressed steel bar a and the truss steel bar.

Furthermore, the segments are in staggered joint and lap joint when being longitudinally connected, and the wedge-shaped jacking blocks are always positioned on two sides of the central axis of the segment structure in the assembling process.

Furthermore, the UHPC protective layer and the common concrete layer are both prefabricated parts.

Further, the method for prefabricating the UHPC protective layer and the common concrete layer comprises the following steps: firstly, binding and connecting reinforcing steel bars in a UHPC protective layer, namely stressed reinforcing steel bars a and truss reinforcing steel bars, wherein the two reinforcing steel bars are uniformly and equidistantly arranged along the length direction of the duct piece; after the reinforcing steel bars are bound, pouring the ultra-high performance concrete in the UHPC protective layer, wherein one part of the truss reinforcing steel bars is exposed to the outer side of the UHPC protective layer after pouring; performing high-temperature steam curing on the UHPC protective layer for not less than 48h, controlling the temperature to be about 90 ℃, and protecting exposed truss reinforcing steel bars by wrapping waterproof films or spraying anti-corrosion materials properly in the steam curing process; monitoring shrinkage in the prefabrication process of the UHPC protective layer, after initial self-shrinkage of the ultra-high performance concrete poured by the UHPC protective layer is basically finished and the strength meets the requirement, pouring a common concrete layer in an overlapping mode, wherein the UHPC protective layer plays a role of overlapping a bottom plate, correspondingly, the common concrete layer is poured after side templates are erected on two sides of the UHPC protective layer, and a proper amount of expanding agent is added in the pouring process to control the shrinkage of the common concrete; and after pouring is finished, integral maintenance is carried out until the strength requirement is met, and the product can be delivered from a factory.

The invention has the beneficial effects that:

the invention has the following effects and advantages: the overlapped prefabricated double-layer duct piece is adopted, so that the bonding reliability of the UHPC layer and the concrete layer interface is enhanced, the interlayer stress concentration caused by the initial self-shrinkage of the UHPC material is avoided, the UHPC material and the steel bar with high manufacturing cost are saved, the economic effect is good, the construction is convenient, the self weight of the duct piece is reduced, the transportation is convenient, and the impermeability and the corrosion resistance of the duct piece structure are enhanced.

Drawings

FIG. 1 is a schematic view of the overall plan view of a duct piece of the present invention;

FIG. 2 is a schematic view of the integral reinforcement of the segment structure;

FIG. 3 is a schematic view of the inter-segment connection;

FIG. 4 is a top view of a proof mass;

FIG. 5 is a top view of the connector block A;

FIG. 6 is a top view of the connecting block B;

FIG. 7 is a top view of a wedge-shaped top block;

FIG. 8 is a front view of a standard block;

FIG. 9 is a front view of the connecting block A;

FIG. 10 is a front view of the connecting block B;

FIG. 11 is a front view of a wedge-shaped top block;

FIG. 12 is a reinforcement diagram for a UHPC protective layer;

FIG. 13 is an enlarged view of a detailed reinforcement

Fig. 14 is a longitudinally connected expanded view of the tube sheet.

In the figure, 1 is a standard block; 2 is a connecting block A; 2-1 is the overlapping edge of the connecting block A; 3 is a connecting block B; 3-1 is the overlapping edge of the connecting block B; 4 is a wedge-shaped top block; 4-1 is the left overlapping edge of the top block; 4-2 is the right overlapping edge of the top block; 5 is a UHPC protective layer; 6 is a common concrete layer; 7 is a screw hole; 8 is a stressed steel bar a; 9 is a stressed steel bar b; 10 is a truss steel bar; and 11 is a mounting hole.

Detailed Description

In order to further illustrate the present invention, the following detailed description of the present invention is given with reference to the accompanying drawings and examples, which should not be construed as limiting the scope of the present invention.

Example (b): as shown in fig. 1-13: the invention comprises three standard blocks 1, a connecting block A2, a connecting block B3 and a wedge-shaped top block 4 which are mutually connected; the segment lining blocks are composed of an outer UHPC protective layer 5 and an inner common concrete layer 6; the UHPC protective layer 5 is tightly attached to the common concrete layer 6; the standard blocks 1, the connecting blocks A2, the connecting blocks B3 and the wedge-shaped top blocks 4 which are adjacent to each other and are uniformly distributed on the common concrete layer 6, and the screw holes 7 are penetrated through connecting bolts to be fastened and connected; the UHPC protective layer 5 internally comprises a stressed steel bar a8 and a part of truss steel bars 10, and the common concrete layer internally comprises stressed steel bars b9 and a part of truss steel bars 10; the UHPC protective layer 5 and the common concrete layer 6 are tightly connected together through a truss-stressed steel bar net rack formed by stressed steel bars a8, stressed steel bars b9 and truss steel bars 10; the UHPC protective layer 5 and the common concrete layer 6 are both prefabricated components, and the prefabrication method comprises the following steps: firstly, binding and connecting steel bars in a UHPC protective layer, namely stressed steel bars a8 and truss steel bars 10, wherein the two steel bars are uniformly and equidistantly arranged along the length direction of the duct piece; after the steel bars are bound, pouring the ultra-high performance concrete in the UHPC protective layer, wherein a part of the truss steel bars 10 are exposed to the outer side of the UHPC protective layer 5 after pouring; performing high-temperature steam curing on the UHPC protective layer 5 for not less than 48h, wherein the temperature is controlled to be about 90 ℃, and the exposed truss reinforcing steel bars are protected by wrapping waterproof films or spraying anti-corrosion materials properly in the steam curing process; monitoring shrinkage in the prefabrication process of the UHPC protective layer 5, after initial self-shrinkage of the ultra-high performance concrete poured by the UHPC protective layer 5 is basically finished and the strength meets the requirement, pouring a common concrete layer 6 in a superposition mode, wherein the UHPC protective layer 5 plays a role of a superposition bottom plate, correspondingly, the common concrete layer 6 is poured after side templates are supported on two sides of the UHPC protective layer, and a proper amount of expanding agent is added in the pouring process to control the shrinkage of the common concrete; after pouring is finished, integral maintenance is carried out until the strength requirement is met, and the product can be delivered out of a factory; the reserved screw holes and mounting holes are reserved in the process of prefabricating and overlapping; the arc center angle of the standard block 1 is 72 degrees, the arc center angles of the connecting block A2 and the connecting block B3 are 64.5 degrees, and the arc center angle of the wedge-shaped top block 4 is 15 degrees;

as shown in fig. 4-11: the connecting device comprises a standard block 1, a connecting block A2, a connecting block B3 and a wedge-shaped top block 4, wherein a mounting hole 11 is formed in the standard block 1, the connecting block A2, the connecting block B3 and the wedge-shaped top block 4, the outer side of the connecting block A2 is provided with a connecting block A overlapping edge 2-1, the outer side of the connecting block B3 is provided with a connecting block B overlapping edge 3-1, and the two sides of the wedge-shaped top block 4 are provided with a top block left overlapping edge 4-1 and a top block right overlapping edge 4-2; the angle shape of the connecting block A overlapping edge 2-1 corresponds to that of the top block left overlapping edge 4-1, and the angle shape of the connecting block B overlapping edge 3-1 corresponds to that of the top block right overlapping edge 4-2;

the thickness of the UHPC protective layer 5 is less than or equal to that of the common concrete layer 6; in the embodiment, the thickness of a segment of 300mm is taken as an example, the thickness of the UHPC protective layer 5 can be 120mm, the thickness of the ordinary concrete layer 6 can be 180mm, the integral dead weight of each segment can be reduced by 10% -15% compared with that of the ordinary concrete segment, more convenient transportation and assembly are realized, and the self-weight reduction proportion of the segment does not basically influence the segment structure to be dead-weight anti-floating; preferably, when the thickness of the UHPC protective layer 5 is equal to that of the common concrete layer 6, the self weight of the duct piece is lowest, the stress effect and the seepage-proofing and corrosion-proofing effects are optimal, and the overall cost can be correspondingly increased;

waterproof sealing gaskets are arranged at the joint positions of the three standard blocks 1, the connecting block A2, the connecting block B3 and the wedge-shaped top block 4; the outer side of the UHPC protective layer 5 is not subjected to additional waterproof treatment; when the reinforcing fiber added into the UHPC protective layer 5 is steel fiber, other steel bars are not configured in the UHPC protective layer except the stressed steel bar a8 and the truss steel bar 10; because the UHPC material has ultra-strong anti-permeability and anti-corrosion performance, the UHPC material is directly used as a waterproof material and a stressed material without additional waterproof treatment, the anti-permeability and compactness of the UHPC material are utilized to resist the internal infiltration of underground water, the tensile compression performance of the UHPC material added with steel fibers is greatly improved compared with that of common concrete, the anti-cracking capability is also enhanced, and common stressed steel bars are configured to resist external forces caused by settlement, soil pressure and the like of the segment, so the reinforcement is reduced to achieve excellent economic effect;

as shown in fig. 14: the segments are in staggered joint and lap joint when being longitudinally connected, and the wedge-shaped jacking blocks 4 are always positioned on two sides of the central axis of the segment structure in the assembling process.

Particularly, considering that the UHPC material has larger early self-shrinkage, the invention only can use the UHPC material as a laminated mould plate layer in the prefabrication process, and the UHPC material is cured by high-temperature steam at 90 ℃ for not less than 48h in the manufacturing process for demoulding, and the self-shrinkage of the ultra-high performance concrete material is monitored in the prefabrication process, and the concrete of the common concrete layer 6 can be poured after the rapid self-shrinkage from the initial stage is basically completed; after the UHPC protective layer 5 is poured, the inner side surface does not need to be plastered, and a natural rough surface is overlapped with the common concrete layer 6 on the inner side surface; consider the section of jurisdiction UHPC protective layer 5 and 6 interlamination of ordinary concrete layer and drop and the possibility of displacement, set up atress reinforcing bar a8 and truss reinforcing bar 10 and evenly arrange along section of jurisdiction length direction, when selected UHPC protective layer 5 thickness is too thin, ordinary concrete layer 6 is very thick when the dead weight is too big, the preferred can penetrate the concrete nail at ordinary concrete layer 6 and stretch into in UHPC protective layer 5 reinforcing interlamination connection reliability, the two-layer thickness ratio of this embodiment is 2: 3, the dead weight of the common concrete layer is not large, so only the stress steel bar a8 and the truss steel bar net rack 10 are arranged.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.