Super-long concrete seamless construction structure

Abstract

The invention provides an ultra-long concrete seamless construction structure which comprises concrete and an expansion reinforcing band arranged on the portion with large shrinkage stress of the concrete, the expansion reinforcing band comprises a steel wire mesh, the steel wire mesh divides the concrete into in-band concrete and out-band concrete, the steel wire mesh is vertically arranged between upper-layer reinforcing steel bars of an upper plate and lower-layer reinforcing steel bars of a lower plate, and the steel wire mesh is arranged between the upper-layer reinforcing steel bars of the upper plate and the lower-layer reinforcing steel bars of the lower plate. And horizontal temperature steel bars are also arranged in the expansion reinforcing band, are uniformly distributed on the upper-layer steel bars and the lower-layer steel bars, and are vertical to the length direction of the expansion reinforcing band. According to the super-long concrete seamless construction structure and the expansion reinforcing band, the specific reinforcing area is arranged in the concrete structure, and the expansion agent is doped, so that the tensile strength and the expansion rate of concrete are improved, the shrinkage stress of the concrete is effectively counteracted, and structural cracking is prevented.

Description

Technical Field

[0001] The invention belongs to the technical field of concrete construction, and in particular relates to an ultra-long concrete seamless construction structure. Background Art

[0002] In the construction industry, super-long concrete is one of the main materials used in the construction process of construction projects, and its concrete components are the most important load-bearing components of building structures. The application of pumped concrete technology in construction has led to a gradual increase in the number of temperature shrinkage cracks that are prone to appear in super-long concrete structures. The surface coefficient of large-volume concrete is relatively small, the heat release of cement hydration is relatively concentrated, and the internal temperature rises relatively quickly; therefore, when the temperature difference between the inside and outside of the concrete is large, temperature cracks will occur in the concrete, affecting the safety and normal use of the structure. Summary of the invention

[0003] In view of this, the present invention aims to propose an ultra-long concrete seamless construction structure to solve the problem of how to effectively prevent the concrete structure from cracking.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows: An ultra-long seamless concrete construction structure includes an expansion reinforcement belt arranged on the concrete and the part with large shrinkage stress thereof, the expansion reinforcement belt includes a steel wire mesh, the steel wire mesh separates the concrete into concrete inside the belt and concrete outside the belt, the steel wire mesh is vertically arranged between the upper steel bars of the upper plate and the lower steel bars of the lower plate, and horizontal temperature steel bars are also arranged inside the expansion reinforcement belt, the horizontal temperature steel bars are evenly distributed on the upper steel bars and the lower steel bars, and are perpendicular to the length direction of the expansion reinforcement belt.

[0005] Furthermore, rubber water stop strips or steel plates are vertically added to the two ends of the lower plate, and the water stop strips or steel plates should extend vertically from the cushion layer to the connection with the outer wall steel plate.

[0006] Furthermore, both ends of the horizontal temperature reinforcement extend 2 meters outside the expansion reinforcement belt and are fixed on the upper reinforcement and the lower reinforcement.

[0007] Furthermore, the horizontal temperature steel bars account for 10% to 15% of the total steel bars.

[0008] Furthermore, two ends of the steel wire mesh are tied to the upper steel bars and the lower steel bars.

[0009] Furthermore, the amount of expansion agent in the concrete inside the belt is 2% to 3% higher than that in the concrete outside the belt.

[0010] Furthermore, the concrete inside the belt is a large-expansion concrete mixed with 15% UEA, and the concrete outside the belt is a small-expansion concrete mixed with 12% UEA.

[0011] Furthermore, the steel wire mesh is a dense mesh steel wire mesh.

[0012] Compared with the prior art, the ultra-long seamless concrete construction structure of the present invention has the following advantages: (1) The ultra-long seamless concrete construction structure described in the present invention can effectively prevent the concrete structure from cracking, improve construction efficiency, and reduce construction costs.

[0013] (2) The ultra-long seamless concrete construction structure described in the present invention, the expansion reinforcement belt, by setting a specific reinforcement area in the concrete structure and utilizing the addition of an expansion agent, improves the tensile strength and expansion rate of the concrete, thereby effectively offsetting the shrinkage stress of the concrete and preventing structural cracking. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings: Figure 1 This is a schematic diagram of the super-long concrete seamless construction structure described in an embodiment of the present invention.

[0015] Description of reference numerals: 1-upper plate; 2-upper steel bars; 3-horizontal temperature steel bars; 4-concrete inside the belt; 5-concrete outside the belt; 6-wire mesh; 7-lower steel bars; 8-lower plate. DETAILED DESCRIPTION

[0016] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0017] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0019] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0020] An ultra-long seamless concrete construction structure, such as Figure 1 As shown, an expansion reinforcement belt is provided including concrete and a part thereof with large shrinkage stress, the expansion reinforcement belt includes a steel mesh 6, the steel mesh 6 separates the concrete into concrete 4 inside the belt and concrete 5 outside the belt, the steel mesh 6 is vertically arranged between the upper steel bars 2 of the upper plate 1 and the lower steel bars 7 of the lower plate 8, and horizontal temperature steel bars 3 are also provided inside the expansion reinforcement belt, the horizontal temperature steel bars 3 are evenly distributed on the upper steel bars 2 and the lower steel bars 7, and are perpendicular to the length direction of the expansion reinforcement belt.

[0021] In order to improve the waterproof effect of the expansion reinforcement belt of the lower plate 8, a stepped joint is left, that is, concrete is poured first to leave a stepped opening (two steel meshes are tied), and the hard stubble needs additional waterproofing treatment. Rubber waterstop strips or steel plates are vertically added to the ends of the lower plate 8. The waterstop strips or steel plates should extend vertically from the cushion layer to the connection with the outer wall steel plate to prevent horizontal water infiltration.

[0022] Preferably, both ends of the horizontal temperature reinforcement 3 extend 2 meters outside the expansion reinforcement belt and are fixed to the upper reinforcement 2 and the lower reinforcement 7 to improve the tensile strength and stability of the expansion reinforcement belt.

[0023] The horizontal temperature reinforcement 3 is 10% to 15% of the total reinforcement.

[0024] In order to ensure the stability of the expansion reinforcement belt, the two ends of the wire mesh 6 are tied to the upper steel bars 2 and the lower steel bars 7.

[0025] The amount of expansive agent in the inner concrete 4 is usually 2% to 3% higher than that in the outer concrete 5. The inner concrete 4 is a large expansive concrete with 15% UEA, and the outer concrete 5 is a small expansive concrete with 12% UEA.

[0026] Preferably, the steel wire mesh 6 is a dense mesh steel wire mesh.

[0027] The key construction technologies of concrete expansion reinforcement belt mainly include the setting position, belt width and steel bar arrangement, concrete mix ratio and construction method. The expansion reinforcement belt should be set at the location where the concrete shrinkage stress is the largest, usually in the middle of the length direction. The belt width is generally 1.5 meters to 2.0 meters, and the specific width can be adjusted according to the project requirements. Dense mesh wire mesh needs to be arranged on both sides of the belt to separate the concrete inside the belt from the concrete outside the belt. The wire mesh is arranged vertically between the upper and lower layers of steel bars, and the two ends are tied to the steel bars to ensure the stability of the belt. Inside the belt, a certain proportion of horizontal temperature steel bars needs to be added, usually 10% to 15% of the total steel bars, evenly distributed on the upper and lower layers of steel bars. These steel bars are perpendicular to the length direction of the expansion reinforcement belt, and the two ends extend 2 meters outside the belt and are fixed to the steel bars to improve the tensile strength and stability of the belt.

[0028] The mix ratio of concrete is also one of the key technologies. The strength grade of the concrete inside the belt is usually one level higher than that of the concrete outside the belt. An appropriate amount of UEA expansion agent is added to increase the expansion rate of the concrete and reduce the possibility of cracking. The amount of expansion agent in the concrete inside the belt is usually 2% to 3% higher than that of the concrete outside the belt to ensure the compensation shrinkage effect of the belt. During construction, the concrete inside the belt needs to be poured at the same time as the concrete outside the belt to ensure the continuity of construction. After pouring, sufficient maintenance is required to ensure the strength and stability of the concrete. In addition, the treatment of construction joints is also very important. It is necessary to ensure the close combination of the concrete inside and outside the belt to avoid water seepage and cracking.

[0029] When pouring concrete, be careful to prevent concrete from other parts from entering the expansion post-casting zone to avoid affecting the design effect. The pipe-lubricating mortar before pouring concrete must be discarded, and the waste concrete caused by pipe removal to eliminate faults or other reasons is strictly prohibited from entering the working surface. It is strictly prohibited to scatter concrete in the parts that have not been poured. So as to avoid the formation of potential cold joints or weak points. Concrete scattered on the working surface, concrete poured out of the pipe removal, and pipe-lubricating slurry should be hoisted out of the working surface. When pouring concrete near the expansion reinforcement zone, it should be noted that the distance between the vibrator insertion point and the dense mesh quick-easy closing net should be no less than 30cm, and it should not be over-vibrated. The concrete at the expansion reinforcement zone is hoisted by a tower crane bucket and a concrete delivery pipe pump. The pouring of the super-long seamless raft concrete at the reinforcement zone is carried out after the concrete pouring on one side is completed, and the wall concrete is poured after the initial setting and before the final setting of the super-long seamless raft concrete at this part. For the expansion zone concrete, the vibrator can be close to the dense mesh quick-easy closing net, but it must not collide. Early plastic cracks and settlement cracks are prone to occur at the coarse steel bars on the surface of the super-long seamless raft slab after vibration and before initial setting. They must be eliminated by controlling the feeding and secondary vibration to avoid becoming concrete defects, leading to stress concentration and affecting the prevention and control effect of temperature shrinkage cracks. After the bottom plate is poured to the elevation, it is repeatedly smoothed and pressed with a polishing machine before final setting to prevent the shrinkage cracks on the concrete surface. Expansive concrete can only exert the expansion efficiency of UEA concrete if it is fully wet-cured. It is necessary to improve the awareness of maintenance, set up full-time maintenance personnel, and establish a strict concrete maintenance system. After the concrete is poured, it should be moisturized for 14 days. After the concrete is leveled, it should be sprinkled with water to moisten it, and then covered tightly with plastic film, such as a layer of sacks. Spray mist water during the curing period to keep the relative humidity of the environment above 80% to reduce concrete shrinkage. In order to release some shrinkage stress, the construction method of "post-cast expansion reinforcement belt" was adopted in the wall construction, that is, with the expansion reinforcement belt as the boundary, small expansion concrete mixed with 12% UEA was poured in sections. After curing for 28 days, the expansion reinforcement belt was backfilled with large expansion concrete mixed with 15% UEA. The post-cast expansion reinforcement belt can be set according to the traditional post-cast belt. The innovation of the concrete expansion reinforcement belt is mainly reflected in its ability to effectively prevent the cracking of the concrete structure, improve construction efficiency, and reduce construction costs. The expansion reinforcement belt increases the tensile strength and expansion rate of the concrete by setting a specific reinforcement area in the concrete structure and using the addition of expansion agent, thereby effectively offsetting the shrinkage stress of the concrete and preventing structural cracking.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An ultra-long seamless concrete construction structure, comprising an expansion reinforcement belt provided on the concrete and a part thereof with large shrinkage stress, characterized in that: The expansion reinforcement belt includes a wire mesh, which separates the concrete into concrete inside the belt and concrete outside the belt. The wire mesh is vertically arranged between the upper steel bars of the upper plate and the lower steel bars of the lower plate. Horizontal temperature steel bars are also provided inside the expansion reinforcement belt. The horizontal temperature steel bars are evenly distributed on the upper steel bars and the lower steel bars and are perpendicular to the length direction of the expansion reinforcement belt.

2. The ultra-long seamless concrete construction structure according to claim 1 is characterized in that: Rubber waterstop strips or steel plates are added vertically to the ends of the lower plate. The waterstop strips or steel plates should extend vertically from the cushion layer to the connection with the exterior wall steel plate.

3. The ultra-long seamless concrete construction structure according to claim 1 is characterized in that: Both ends of the horizontal temperature reinforcement extend 2 meters outside the expansion reinforcement belt and are fixed to the upper and lower reinforcements.

4. The ultra-long seamless concrete construction structure according to claim 1 is characterized in that: Horizontal temperature reinforcement is 10% to 15% of the total reinforcement.

5. The ultra-long seamless concrete construction structure according to claim 1 is characterized in that: The two ends of the wire mesh are tied to the upper and lower steel bars.

6. The ultra-long seamless concrete construction structure according to claim 1 is characterized in that: The amount of expansive agent in the concrete inside the belt is 2% to 3% higher than that in the concrete outside the belt.

7. The ultra-long seamless concrete construction structure according to claim 6 is characterized by: The concrete inside the zone is large-expansion concrete mixed with 15% UEA, and the concrete outside the zone is small-expansion concrete mixed with 12% UEA.

8. The ultra-long seamless concrete construction structure according to claim 1 is characterized in that: The wire mesh is a dense mesh.

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