Super-long floating slab and construction method thereof

Abstract

The invention discloses a super-long floating slab and a construction method thereof. The construction method comprises the following steps: laying two isolation sliding layers (2) on a base (3); a plurality of reinforcement cage track panel units (61, 62, 63 and 64) are arranged on the upper isolation sliding layer, and the reinforcement cage track panel units are connected end to end and arranged in the track line direction, so that an integral reinforcement cage track panel (65) is formed; a foam board partition layer (8) is arranged in the integral reinforcement cage track panel (65); a formwork is arranged on the integral reinforcement cage track panel (65), first pouring of ballast bed concrete is carried out, and concrete slabs (11, 12 and 13) spaced by foam board partition layers (8) are formed; the foam partition layer (8) is dismantled after initial setting of the concrete, and a temporary expansion joint (14) is formed; and the temporary expansion joint (14) is poured for the second time, and an expanding agent is added into the poured concrete, so that the super-long floating slab is formed.

Description

Technical Field

[0001] The present invention relates to the technical field of rail transportation, and more particularly to an extra-long floating slab and a construction method thereof. Background Art

[0002] At present, urban rail transit is developing rapidly, which greatly facilitates people's travel. However, environmental vibration or noise pollution caused by rail transit is also emerging. Floating slab track technology is an effective vibration-proof and safe technology.

[0003] At present, the floating slab track bed used in floating slab track technology is usually 25m long, the same length as ordinary rails, which is convenient for binding and transportation. The length of some specially designed floating slabs does not exceed 30m. In practice, it is found that there are some problems with such a design. For example, there are plate gaps between floating slabs, which are structurally discontinuous. It is necessary to add vibration isolators and set shear hinges to coordinate the deformation between the plates. Extending the length of the floating slab can improve the integrity of the floating slab, reduce plate gaps, and match 100m long rails. However, simply extending the floating slab is difficult to bind and transport, and one-time integral casting will produce temperature cracks and shrinkage cracks, affecting the structural strength, etc.

[0004] Therefore, new technical methods are needed to at least partially eliminate the deficiencies in the prior art. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention proposes an ultra-long floating slab and a construction method thereof, comprising:

[0006] Two insulating sliding layers (2) are laid on a substrate (3), wherein one side of the insulating sliding layer (2) is smooth and the other side is rough, the rough side of the upper insulating sliding layer faces upwards, the rough side of the lower insulating sliding layer faces downwards, and the smooth sides of the two insulating sliding layers (2) are in contact with each other;

[0007] A plurality of steel cage rail row units (61, 62, 63, 64) are arranged on the upper isolation sliding layer, wherein the plurality of steel cage rail row units are connected end to end and arranged along the track line direction, thereby forming an integral steel cage rail row (65);

[0008] A foam board partition layer (8) is provided in the integral steel cage rail row (65), and the position of the foam board partition layer (8) avoids the connection position between the steel cage rail row units;

[0009] A template is arranged on the integral steel cage rail row (65) to perform the first pouring of the ballast concrete to form concrete slabs (11, 12, 13) separated by foam board partition layers (8);

[0010] After the concrete has initially set, the foam insulation layer (8) is removed to form temporary expansion joints (14) between the concrete slabs (11, 12, 13);

[0011] After the deformation of the concrete poured for the first time is basically stable, pouring the temporary expansion joint (14) for the second time, and adding an expansion agent to the poured concrete; and

[0012] The super long floating slab is cured.

[0013] According to an embodiment of the present invention, the super-long floating slab construction method further comprises, during the process of laying two isolation sliding layers (2), arranging a split ditch cover plate (5) above the central ditch of the base (3), wherein the main body of the ditch cover plate (5) is located between the two isolation sliding layers (2), and the anchoring bars (51) on the ditch cover plate (5) penetrate the upper isolation sliding layer.

[0014] According to an embodiment of the present invention, the insulating sliding layer (2) extends to the tunnel side wall (4).

[0015] According to an embodiment of the present invention, the length of the steel cage rail row unit is 25 meters, and the length of the entire steel cage rail row (65) is 100 meters.

[0016] According to an embodiment of the present invention, the method further comprises, during the process of manufacturing the integral steel cage rail row (65), arranging a vibration isolator (9) therein, wherein the vibration isolators (9) are evenly arranged in the middle section of the integral steel cage rail row (65), and the vibration isolators (9) are relatively densely arranged at the front and rear ends; and the position of the foam board partition layer (8) avoids the vibration isolators (9).

[0017] According to the implementation scheme of the present invention, a steel bar joint is reserved at the end of the steel bar cage rail row unit, and the steel bar joints of adjacent steel bar cage rail row units are respectively convex (71) and concave (72), the two are staggered, and the steel bar joints are provided with a bent anchoring structure (73), and the joints of adjacent steel bar cage rail row units are welded to connect the two.

[0018] According to an embodiment of the present invention, the foam board partition layers (8) are arranged in a staggered manner, or the thickness of the foam board partition layers (8) is uneven, thereby forming a zigzag temporary expansion joint (14).

[0019] According to an embodiment of the present invention, the insulating sliding layer (2) is formed of an insulating film and has a thickness of 0.5-2.0 mm.

[0020] The present invention also provides an extra-long floating slab, which is prepared according to the construction method of the present invention.

[0021] Compared with the prior art, the construction method of the present invention reserves a temporary expansion gap during the first pouring, and sets a double-layer isolation sliding layer to ensure the free contraction of the floating slab concrete. The steel bar joints are avoided during the second pouring, which is conducive to ensuring the structural strength. In addition, the serrated temporary expansion joints at the second pouring position can effectively connect the front and rear structures. That is, the implementation scheme of the present invention adopts the method of splicing steel cage rails to extend the length of the floating slab, and adopts the method of segmented pouring to avoid temperature cracks and shrinkage cracks in the super-long concrete structure, thereby realizing an ultra-long floating slab with good structure and strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of a process for constructing an ultra-long floating slab according to an embodiment of the present invention;

[0023] Figure 2 is a schematic cross-sectional view of an ultra-long floating plate structure according to an embodiment of the present invention;

[0024] Figure 3 It is a structural schematic diagram of a split-type ditch cover in an ultra-long floating plate structure according to an embodiment of the present invention;

[0025] Figure 4 A schematic diagram of an integral steel cage rail row structure formed by a plurality of steel cage rail row units in a super-long floating slab construction method according to an embodiment of the present invention;

[0026] Figure 5 A schematic diagram of the connection between steel cage rail row units in the super-long floating slab construction method according to an embodiment of the present invention;

[0027] Figure 6 A schematic diagram of the arrangement of vibration isolators in a super-long floating slab construction method according to an embodiment of the present invention;

[0028] Figure 7 A schematic diagram of forming a zigzag temporary expansion joint in a super-long floating slab construction method according to an embodiment of the present invention; and

[0029] Figure 8 It is a schematic diagram of forming a zigzag temporary expansion joint in a super-long floating slab construction method according to another embodiment of the present invention. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings. The shown contents are used to fully illustrate the contents of the present invention, but are not used to limit the present invention.

[0031] Figure 1 A schematic diagram of a process for constructing an ultra-long floating slab according to an embodiment of the present invention; Figure 2The cross-sectional schematic diagram of the super-long floating slab structure according to the embodiment of the present invention. As shown in the figure, the super-long floating slab construction method of the embodiment may include the following steps:

[0032] First, a double-layer isolation sliding layer 2 can be laid on the base 3, and the double-layer isolation sliding layer 2 can extend all the way to the tunnel side wall 4. The isolation sliding layer can be an isolation film, for example, a PVC crystal plate material film, one side is smooth and the other side has a texture (rough); it can also be a PE material film, one side is attached with a layer of non-woven fabric to form a rough surface, and the other side is smooth. The thickness of the isolation film can be, for example, 0.5-2.0 mm.

[0033] During the laying process, the rough surface of the upper isolation sliding layer of the two isolation sliding layers faces upwards and is bonded to the floating slab concrete to be poured later, while the rough surface of the lower isolation sliding layer faces downwards and contacts the concrete of the base or tunnel wall to generate friction. The smooth surfaces of the two isolation sliding layers face each other, so that a smaller friction coefficient is generated between them. The pouring, hardening and shrinkage process of the floating slab concrete is separated by the isolation sliding layer 2 from the base 3 and the tunnel side wall 4, and no adhesion occurs; in addition, because there is less friction between the smooth surfaces of the isolation sliding layers, the concrete of the floating slab 1 can shrink freely, achieving a good internal organizational structure.

[0034] Figure 3 The structure diagram of the split ditch cover in the super-long floating slab structure according to the embodiment of the present invention; in the process of laying two isolation sliding layers, a split ditch cover 5 can be arranged above the central ditch of the base, the main body of the ditch cover 5 is located between the double isolation sliding layers, and the anchoring ribs 51 of the cover 5 penetrate the upper isolation sliding layer. When laying, a longitudinal gap 52 is reserved between the cover 5 to avoid affecting the concrete shrinkage of the floating slab 1 in the later stage.

[0035] Next, a plurality of steel cage rail row units (61, 62, 63, 64) are arranged on the upper isolation sliding layer, and the plurality of steel cage rail row units are connected end to end and arranged along the track line direction, thereby forming an integral steel cage rail row 65. Figure 4 It is a schematic diagram of an integral steel cage rail row structure formed by a plurality of steel cage rail row units in a super-long floating slab construction method according to an embodiment of the present invention.

[0036] As shown in the figure, the steel cage rail row units can be tied at 25m each, and each group of 4 can be spliced ​​into a 100m long super-long steel cage rail row 65, wherein the steel cage rail row units are numbered 61, 62, 63 and 64. These steel cage rail row units are connected to each other to form a connection seam 66.

[0037] More specifically, Figure 5This is a schematic diagram of the connection between the steel cage rail row units in the super-long floating slab construction method according to the implementation scheme of the present invention. Referring to the attached drawings, a steel bar joint can be reserved at the end of the steel cage rail row unit, for example, at the end of the steel cage rail row unit 61, the front end of the steel cage rail row unit 64, and the two ends of the steel cage rail row units 62 and 63, steel bar joints are reserved, and the adjacent rail row steel bar joints are respectively convex 71 and concave 72, and the two are staggered. In addition, the steel bar joints are provided with a bending anchoring structure 73. After the steel cage rail row unit is transported to the tunnel and placed on the isolation sliding layer 2, the steel bar joints at the ends of the adjacent units are welded, and the cross-sectional area of ​​the welded steel bars meets the drainage requirements of the project, thereby forming a 100m long integral steel cage rail row 65.

[0038] In the process of forming the integral steel cage rail array 65, a vibration isolator 9 may be provided in the steel cage rail array. Figure 6 The diagram is a schematic diagram of the vibration isolators in the super-long floating slab construction method according to an implementation plan of the present invention; as shown in the figure, the spacing of the vibration isolators 9 can be slightly smaller at the front end of the steel cage rail row unit 61 and the end of the steel cage rail row unit 64, that is, the vibration isolators 9 are densely arranged, and at the same time, the vibration isolators 9 are evenly arranged at slightly larger intervals at other positions of the steel cage rail row unit 61, the steel cage rail row unit 64 and the steel cage rail row unit 62, and the steel cage rail row unit 63.

[0039] After the integral steel cage rail row 65 is formed, a foam board partition layer 8 may be provided therein. Figure 7 A schematic diagram of forming a zigzag temporary expansion joint in a super-long floating slab construction method according to an embodiment of the present invention;

[0040] Figure 8 It is a schematic diagram of forming a zigzag temporary expansion joint in a super-long floating slab construction method according to another embodiment of the present invention.

[0041] As shown in the figure, a foam board partition layer 8 can be inserted into the integral steel cage rail row 65, and the position of the foam board partition layer 8 avoids the connection position between the vibration isolator 9 and the steel cage rail row unit, that is, avoids the connection seam 66. The purpose of setting the foam board partition layer 8 is to form a temporary expansion joint 14 later, so that the extra-long floating plate is divided into multiple concrete plates by the temporary expansion joint 14, which is conducive to the contraction of the extra-long floating plate. In addition, the serrated temporary expansion joint 14 can effectively connect the front and rear structures after pouring.

[0042] Referring to the attached drawings, in order to form the zigzag temporary expansion joint 14, foam board partition layers of the same thickness can be inserted into the longitudinal reinforcement gaps one by one in a staggered manner along the longitudinal direction of the line, or foam board partition layers of different thicknesses can be inserted into the longitudinal reinforcement gaps one by one in a center-aligned manner along the longitudinal direction of the line. In this way, after the first pouring, after the foam board partition layers are removed, a zigzag temporary expansion joint 14 will be formed.

[0043] After the vibration isolator 9 and the foam board partition layer 8 are set, a template (not shown) is set on the integral steel cage rail row 65 to carry out the first pouring of the ballast concrete. The pouring range is the range except the foam insulation layer of the steel cage rail row unit 62 and the foam insulation layer of the steel cage rail row unit 63. After pouring, the foam partition layer 8 is used as the boundary to form concrete slabs (11, 12, 13) separated by the foam board partition layer 8. Here, the foam partition layer 8 actually plays the role of a template during the first pouring, and is also the location for reserving temporary expansion joints. And the steel bars here are complete and continuous steel bars, and there are no joints. The vibration isolator sleeves 9 are symmetrically arranged on both sides of the foam board partition layer 8.

[0044] After the initial setting of the concrete, the foam partition layer 8 is removed to expose the jagged temporary expansion joints 14 between the concrete slabs, which are washed with a high-pressure water gun to expose the aggregate at the ends, presenting a rough and uneven state.

[0045] After the deformation of the first pouring of concrete is basically stable, the second pouring is carried out, and the pouring range is the temporary expansion joint 14 exposed after removing the foam board partition layer 8. An expansion agent can be added to the second pouring of concrete to prevent excessive shrinkage of the concrete. Concrete expansion agents are well known in the art and are not described in detail here.

[0046] After the slabs are fully cured, a 100-meter-long super-long floating slab is formed, the displacement of the vibration isolator 9 is checked, and the inner sleeve of the vibration isolator is installed.

[0047] The above description of the embodiments is to facilitate the understanding and application of the present invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the embodiments herein, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A super long floating slab construction method, characterized in that: include: Two insulating sliding layers (2) are laid on a substrate (3), wherein one side of the insulating sliding layer (2) is smooth and the other side is rough, the rough side of the upper insulating sliding layer faces upwards, the rough side of the lower insulating sliding layer faces downwards, and the smooth sides of the two insulating sliding layers (2) are in contact with each other; A plurality of steel cage rail row units (61, 62, 63, 64) are arranged on the upper isolation sliding layer, wherein the plurality of steel cage rail row units are connected end to end and arranged along the track line direction, thereby forming an integral steel cage rail row (65); A foam board partition layer (8) is provided in the integral steel cage rail row (65), and the position of the foam board partition layer (8) avoids the connection position between the steel cage rail row units; A template is arranged on the integral steel cage rail row (65) to perform the first pouring of the ballast concrete to form concrete slabs (11, 12, 13) separated by foam board partition layers (8); After the concrete has initially set, the foam insulation layer (8) is removed to form temporary expansion joints (14) between the concrete slabs (11, 12, 13); After the deformation of the concrete poured for the first time is basically stable, pouring the temporary expansion joint (14) for the second time, and adding an expansion agent to the poured concrete; and The super long floating slab is cured.

2. The method for constructing an ultra-long floating slab according to claim 1, characterized in that: The method also includes arranging a split ditch cover plate (5) above the central ditch of the base (3) during the process of laying the two isolation sliding layers (2), wherein the main body of the ditch cover plate (5) is located between the two isolation sliding layers (2), and the anchoring ribs (51) on the ditch cover plate (5) penetrate the upper isolation sliding layer.

3. The super long floating slab construction method according to claim 1, characterized in that: The insulating sliding layer (2) extends to the tunnel side wall (4).

4. The super long floating slab construction method according to claim 1, characterized in that: The length of the steel cage rail row unit is 25 meters, and the length of the entire steel cage rail row (65) is 100 meters.

5. The super long floating slab construction method according to claim 1, characterized in that: The invention also includes arranging vibration isolators (9) during the process of manufacturing the integral steel cage rail row (65); the vibration isolators (9) are evenly arranged in the middle section of the integral steel cage rail row (65); and the vibration isolators (9) are relatively densely arranged at the front and rear ends; and the position of the foam board partition layer (8) avoids the vibration isolators (9).

6. The method for constructing an ultra-long floating slab according to claim 1, characterized in that: A steel bar joint is reserved at the end of the steel bar cage rail row unit. The steel bar joints of adjacent steel bar cage rail row units are respectively convex (71) and concave (72), which are staggered. The steel bar joints are provided with a bent anchoring structure (73). The joints of adjacent steel bar cage rail row units are welded to connect the two.

7. The super long floating slab construction method according to claim 1, characterized in that: The foam board partition layers (8) are arranged in a staggered manner, or the thickness of the foam board partition layers (8) is uneven, thereby forming a zigzag temporary expansion joint (14).

8. The method for constructing an ultra-long floating slab according to claim 1, characterized in that: The isolation sliding layer (2) is formed by an isolation film and has a thickness of 0.5-2.0 mm.

9. An extra-long floating slab prepared according to the construction method according to any one of claims 1 to 8.

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