Concrete construction method applied to expansion reinforcing band

Abstract

The invention discloses a concrete construction method applied to an expansion reinforcing band, and relates to the technical field of concrete expansion band construction.The concrete construction method applied to the expansion reinforcing band comprises the steps that a first out-of-band area and a second out-of-band area of an expansion reinforcing band area are formed on a structural surface at intervals; separating the first out-of-band region, the expansion reinforcing band region and the second out-of-band region; preparing in-band concrete and out-band concrete; pouring out-of-band concrete into the first out-of-band area and the second out-of-band area, and pouring in-band concrete into the expansion reinforcing band area; and communicating the first out-of-band region, the expansion reinforcing band region and the second out-of-band region to form the expansion reinforcing band. According to the method, by using the isolation formwork and the partition pouring method, the compactness of the expansion reinforcing band joint is improved, the phenomenon that the expansion reinforcing band joint cracks due to shrinkage deformation, stress concentration and the like is avoided, and the structural integrity and the construction quality of the expansion reinforcing band are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete expansion belt construction, and particularly relates to a concrete construction method applied to an expansion strengthening belt. Background Technique

[0002] At present, the principle of the expansion strengthening belt is to achieve compensated shrinkage deformation by adding different dosages of expansion agents to the concrete, avoid stress concentration and shrinkage cracks, and improve the compactness. However, in the existing concrete construction process of the expansion strengthening belt, problems such as cracks easily occurring in the joints of the expansion strengthening belt due to shrinkage deformation, stress concentration, etc. are likely to occur, thus affecting the structural strength. Summary of the Invention

[0003] The main object of the present invention is to propose a concrete construction method applied to an expansion strengthening belt, aiming to solve the problem of cracks occurring in the joints of the expansion strengthening belt due to shrinkage deformation, stress concentration, etc.

[0004] To achieve the above object, the concrete construction method applied to the expansion strengthening belt proposed by the present invention includes:

[0005] Forming a first outer-zone area and a second outer-zone area of the expansion strengthening belt region at intervals on the structural surface; the expansion strengthening belt region is arranged between the first outer-zone area and the second outer-zone area;

[0006] Separating the first outer-zone area, the expansion strengthening belt region, and the second outer-zone area;

[0007] Preparing in-zone concrete and out-of-zone concrete;

[0008] Pouring the out-of-zone concrete into the first outer-zone area and the second outer-zone area, and pouring the in-zone concrete into the expansion strengthening belt region;

[0009] Connecting the first outer-zone area, the expansion strengthening belt region, and the second outer-zone area to form the expansion strengthening belt.

[0010] In an embodiment, the step of preparing the in-zone concrete and the out-of-zone concrete includes:

[0011] Selecting target aggregates according to a preset particle size;

[0012] Selecting target fine aggregates according to a preset dry density;

[0013] Obtaining initial concrete by using concrete batching, the target aggregates, and the target fine aggregates;

[0014] Adding a first expansion agent to a part of the initial concrete according to a first preset ratio to obtain the in-zone concrete;

[0015] Add a second expansion agent to another part of the initial concrete according to a second preset ratio to obtain the outer concrete.

[0016] In one embodiment, the preset particle size is D, where 5 mm ≤ D ≤ 35 mm.

[0017] In one embodiment, the preset dry density is 1500 kg / m 3 .

[0018] In one embodiment, the first preset ratio is A, where A = total mass of the first expansion agent: total mass of the inner concrete = 0.12:1.

[0019] In one embodiment, the second preset ratio is B, where B = total mass of the second expansion agent: total mass of the outer concrete = 0.1:1.

[0020] In one embodiment, the steps of pouring the outer concrete into the first outer region and the second outer region and pouring the inner concrete into the expansion reinforcement zone include:

[0021] First, pour the outer concrete into the first outer region, and then pour the outer concrete into the second outer region;

[0022] Pour the inner concrete into the expansion reinforcement zone.

[0023] In one embodiment, the steps of pouring the outer concrete into the first outer region and the second outer region and pouring the inner concrete into the expansion reinforcement zone include:

[0024] Pour the outer concrete into the first outer region;

[0025] Pour the inner concrete into the expansion reinforcement zone;

[0026] Pour the outer concrete into the second outer region.

[0027] In one embodiment, the steps of pouring the outer concrete into the first outer region and the second outer region and pouring the inner concrete into the expansion reinforcement zone include:

[0028] Pour the outer concrete into the first outer region and the second outer region simultaneously;

[0029] Pour the inner concrete into the expansion reinforcement zone.

[0030] In one embodiment, after the steps of pouring the out-of-band concrete into the first out-of-band area and the second out-of-band area, and pouring the in-band concrete into the expansion reinforcement belt area, the method further includes:

[0031] Vibrating the out-of-band concrete and the in-band concrete using a vibrating rod.

[0032] The technical solution of the present invention divides the expansion reinforcement belt area and its adjacent out-of-band areas, and uses out-of-band concrete and in-band concrete with different proportions to ensure the performance of the concrete in each part of the expansion reinforcement belt. In addition, by using isolation forms and the method of sectional pouring, the mixing of concrete in different areas is effectively prevented, thereby improving the compactness of the joints of the expansion reinforcement belt, avoiding cracks in the joints of the expansion reinforcement belt due to shrinkage deformation, stress concentration, etc., and ensuring the structural integrity and construction quality of the expansion reinforcement belt. The role of the expansion reinforcement belt in the structure is fully exerted, which can effectively compensate or control the shrinkage of concrete, reduce the generation of cracks, and thus improve the durability and stability of the overall structure. It not only improves the construction efficiency and shortens the construction period, but also is applicable to various large-scale buildings and infrastructure projects that require the setting of expansion reinforcement belts. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0034] Figure 1 It is a schematic flowchart of an embodiment of the concrete construction method applied to the expansion reinforcement belt provided by the present invention.

[0035] The realization of the object of the present invention, its functional features and advantages will be further described in conjunction with the embodiments and with reference to the drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0037] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, then such directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture. If the specific posture changes, then the directional indications will also change accordingly.

[0038] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present invention, then such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those skilled in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0039] Currently, the principle of the expansion strengthening belt is to achieve compensated shrinkage deformation by adding different dosages of expansion agents to the concrete, avoid stress concentration and shrinkage cracks, and improve the density. However, during the concrete construction process of the existing expansion strengthening belt, problems such as cracks easily occurring in the joints of the expansion strengthening belt due to shrinkage deformation, stress concentration, etc. are likely to occur, thus affecting the structural strength.

[0040] To solve this technical problem, the present invention proposes a concrete construction method applied to the expansion strengthening belt.

[0041] Please refer to Figure 1 , in an embodiment of the present invention, the concrete construction method applied to the expansion strengthening belt includes:

[0042] Step S10, forming a first out-of-zone area and a second out-of-zone area of the expansion strengthening belt region at intervals on the structural surface; the expansion strengthening belt region is arranged between the first out-of-zone area and the second out-of-zone area;

[0043] Step S20, separating the first out-of-zone area, the expansion strengthening belt region, and the second out-of-zone area;

[0044] Step S30, configuring the in-zone concrete and the out-of-zone concrete;

[0045] Step S40, pouring the out-of-zone concrete into the first out-of-zone area and the second out-of-zone area, and pouring the in-zone concrete into the expansion strengthening belt region;

[0046] In step S50, connect the first out-of-zone area, the expansion strengthening belt area, and the second out-of-zone area to form the expansion strengthening belt.

[0047] Specifically, in step S10, the expansion strengthening belt area, the first out-of-zone area, and the second out-of-zone area are formed at intervals on the structural plane. The expansion strengthening belt area is arranged between the first out-of-zone area and the second out-of-zone area. Specifically, determine the position and width of the expansion strengthening belt according to the design drawings and mark them on the structural plane. When marking, first determine the center line of the expansion strengthening belt, and then measure half of the width on both sides, and use paint or chalk line to mark the boundary lines of the first out-of-zone area, the expansion strengthening belt area, and the second out-of-zone area. By reasonably dividing the areas, it can lay a foundation for subsequent sectional pouring.

[0048] In step S20, separate the first out-of-zone area, the expansion strengthening belt area, and the second out-of-zone area. The purpose of this step is to prevent the concrete in different areas from mixing during pouring, which affects the construction quality of the expansion strengthening belt. Steel formwork or wooden formwork can be used for separation. The height of the formwork should be flush with the structural plane, the thickness should not be less than 2 cm, and the length should cover the entire area boundary. When installing the formwork, it should be ensured that it is vertical and stable to prevent displacement or deformation during pouring. Through reliable separation measures, ensure the independence of the concrete materials in each area and ensure that the joints of the expansion strengthening belt do not produce misalignment.

[0049] In step S30, configure the in-belt concrete and the out-of-belt concrete. The in-belt concrete is used for pouring the expansion strengthening belt area, and the out-of-belt concrete is used for pouring the first out-of-zone area and the second out-of-zone area. The mix ratios of the two kinds of concrete need to be optimized according to the design requirements and environmental conditions, but the basic principle is that the in-belt concrete should have higher strength and lower shrinkage performance, while the out-of-belt concrete should have good workability and crack resistance.

[0050] In step S40, pour the out-of-belt concrete into the first out-of-zone area and the second out-of-zone area, and pour the in-belt concrete into the expansion strengthening belt area. The pouring process should be continuous to avoid cold joints. Different conveying equipment, such as tank trucks, pump trucks, etc., should be used for the out-of-belt concrete and the in-belt concrete respectively to prevent mixing. In each area, the method of multi-point pouring and layered vibration should be adopted to ensure the uniformity and density of the concrete. When vibrating, the insertion point should be quickly inserted and slowly pulled out, and the insertion time for each time is 2 - 3 s, and the vibrating rod should be inserted into the lower layer of concrete by 5 - 10 cm. The vibration should be uniform and systematic, and there should be no missed vibration or over-vibration. Through standardized pouring and vibration, ensure that the concrete quality in each area meets the requirements.

[0051] In step S50, the first out-of-zone area, the expansion strengthening zone area, and the second out-of-zone area are connected to form the expansion strengthening zone. After the concrete begins to set, the separating formwork is removed to connect the three areas. A troweling machine or manual method is used for surface troweling to make the surface of the entire expansion strengthening zone flat, smooth, and without obvious joints. Moisture conservation and curing should be noted after connection. Cover with plastic film and sprinkle water regularly. The curing time shall not be less than 14 days. Through timely connection and careful curing, the integrity and durability of the expansion strengthening zone are ensured.

[0052] In the technical solution provided by the present invention, by dividing the expansion strengthening zone area and its adjacent out-of-zone areas, and using out-of-zone concrete and in-zone concrete with different ratios, the performance of the concrete in each part of the expansion strengthening zone is ensured. In addition, by using isolation formwork and the method of sectional pouring, the mixing of concrete in different areas is effectively prevented, thereby improving the compactness of the joints of the expansion strengthening zone, avoiding cracks in the joints of the expansion strengthening zone due to shrinkage deformation, stress concentration, etc., and ensuring the structural integrity and construction quality of the expansion strengthening zone. The role of the expansion strengthening zone in the structure is fully exerted, which can effectively compensate for or control the shrinkage of concrete, reduce the generation of cracks, and thus improve the durability and stability of the overall structure. It not only improves the construction efficiency and shortens the construction period, but also is applicable to various large-scale buildings and infrastructure projects that require the setting of expansion strengthening zones.

[0053] In the embodiment of the present invention, the steps of configuring in-zone concrete and out-of-zone concrete include:

[0054] Step S21, screening to obtain target stones according to a preset particle size;

[0055] Step S22, screening to obtain target fine aggregates according to a preset dry density;

[0056] Step S23, obtaining initial concrete by using concrete batching, the target stones, and the target fine aggregates;

[0057] Step S24, adding a first expansion agent to part of the initial concrete according to a first preset ratio to obtain the in-zone concrete;

[0058] Step S25, adding a second expansion agent to another part of the initial concrete according to a second preset ratio to obtain the out-of-zone concrete.

[0059] Specifically, in step S21, target aggregates are obtained by screening according to a preset particle size. Aggregates are one of the main components of concrete, and their particle size and gradation have important effects on the workability, strength, and durability of concrete. In this embodiment, a preset particle size is used to screen the aggregates to ensure that they meet the requirements of the concrete mix design. The preset particle size can be determined according to engineering needs and specification standards, generally 5-40 mm. The screening process can use equipment such as vibrating screens and rotary screens, and control the screening time and screen mesh size to ensure the uniformity and accuracy of screening.

[0060] In step S22, target fine aggregates are obtained by screening according to a preset dry density. Fine aggregates mainly include natural sand and manufactured sand, and their dry density is an important indicator to measure the quality of fine aggregates. If the dry density is too small, it may contain more impurities or stone powder, affecting the performance of concrete; if the dry density is too large, the gradation may be poor and the workability may be poor. Therefore, in this embodiment, the fine aggregates are screened according to the preset dry density to select target fine aggregates with qualified quality.

[0061] In step S23, initial concrete is obtained by using concrete batching, target aggregates, and target fine aggregates. Concrete batching mainly includes cement, water, admixtures, etc., and their dosages and types can be determined according to the mix design. In this step, the qualified target aggregates, target fine aggregates, and concrete batching are mixed according to the design ratio, and through processes such as stirring and vibrating, initial concrete with uniform and stable performance is obtained. The indexes such as slump, air content, and bleeding rate of the initial concrete should meet the construction requirements. The stirring time is generally 2-5 min, and the stirring uniformity can be judged by visual inspection method or sieve analysis method.

[0062] In step S24, a first expansive agent is added to a part of the initial concrete according to a first preset ratio to obtain inner-zone concrete. The first expansive agent can be a high-quality UEA expansive agent, and its function is to compensate for the volume shrinkage during the hardening process of concrete and generate an expansive force under the action of prestress, improving the crack resistance and durability of concrete.

[0063] In step S25, a second expansive agent is added to another part of the initial concrete according to a second preset ratio to obtain outer-zone concrete. The type and dosage of the second expansive agent can be the same as or different from those of the first expansive agent, and are optimized according to the stress characteristics and environmental conditions of the outer-zone concrete.

[0064] In the embodiment of the present invention, the preset particle size is D, and 5 mm ≤ D ≤ 35 mm.

[0065] Specifically, in the process of preparing concrete, the particle size of aggregates has a significant impact on the final performance of concrete. Appropriate particle size can optimize the density, workability, and durability of concrete. Selecting a particle size range of 5 mm to 35 mm aims to ensure that the concrete has good workability while maintaining high strength and durability.

[0066] More specifically, the collected stone materials are fed into a vibrating screen device. Sieve meshes with different-sized openings are used to separately screen out stone materials with a diameter greater than 5 mm and less than or equal to 35 mm. A moderate particle size helps the stone materials to be better distributed in the concrete, reducing pores, thereby increasing the density and load-bearing capacity of the concrete. In this embodiment, the uniform and appropriate particle size can reduce microcracks in the concrete, improve its frost resistance and impermeability, and thus extend the service life of the structure.

[0067] In an embodiment of the present invention, the preset dry density is 1500 kg / m 3 .

[0068] Specifically, the fine aggregate used in traditional concrete usually has a relatively high dry density. Although it can provide relatively high structural strength, in some application scenarios, such as when good thermal insulation or weight reduction of the structure is required, this high-density fine aggregate may not be the best choice. Therefore, the present invention uses a fine aggregate with a dry density of 1500 kg / m 3 to prepare lightweight concrete, aiming to improve the thermal insulation performance of the concrete while reducing the weight of the structure. Moreover, the concrete using lightweight fine aggregate is lighter than traditional concrete, which helps to reduce the overall structural weight, relieve the foundation burden, and reduce the construction cost. Lightweight concrete has good fluidity and pumpability, is easy to construct and form, and can be used in complex or narrow spaces.

[0069] In an embodiment of the present invention, the first preset ratio is A, and A = the total mass of the first expansion agent: the total mass of the in-zone concrete = 0.12:1.

[0070] Specifically, during the construction of the expansion strengthening belt, the in-zone concrete needs to have moderate expansibility to compensate for the shrinkage during the hardening process of the concrete and generate prestress under restraint conditions to improve the crack resistance of the structure. However, an excessive amount of expansion agent will cause a decrease in the strength of the concrete and affect its load-bearing capacity. Therefore, the present invention aims to optimize the balance between the expansion performance and strength by setting the mass ratio of the first expansion agent to the in-zone concrete as 0.12:1, ensuring the construction quality and service performance of the expansion strengthening belt.

[0071] According to the designed dosage of the in-zone concrete, the mass of the required first expansion agent is calculated. For example, if the total mass of the in-zone concrete is 1000 kg, the dosage of the first expansion agent should be 120 kg.

[0072] More specifically, the weighed first expansive agent is added to the in-rib concrete mixture and thoroughly mixed using a forced mixer. The mixing time should be no less than 3 minutes to ensure the uniform dispersion of the expansive agent in the concrete. During the mixing process, the temperature and humidity of the mixture should be controlled to avoid the influence of external factors on the activity of the expansive agent.

[0073] It should be understood that in this embodiment, by precisely controlling the dosage of the first expansive agent, the in-rib concrete obtains an appropriate expansion capacity, effectively compensates for shrinkage, and reduces the risk of structural cracking. Moreover, the prestress generated by the expansion can form a good stress transfer between the in-rib concrete and other parts, enhancing the integrity and cooperative working ability of the overall structure.

[0074] In the embodiment of the present invention, the second preset ratio is B, where B = the total mass of the second expansive agent: the total mass of the out-rib concrete = 0.1:1.

[0075] Specifically, the out-rib concrete usually bears more structural loads, so its expansion performance needs to be precisely controlled to avoid potential structural integrity problems caused by excessive expansion. By setting the mass ratio of the second expansive agent to the out-rib concrete as 0.1:1, it aims to achieve sufficient expansion to compensate for the natural shrinkage of the concrete while ensuring the structural safety and long-term durability of the concrete.

[0076] According to the planned dosage of the out-rib concrete, calculate the exact mass of the required second expansive agent. For example, if the total mass of the out-rib concrete is 1000 kg, the required amount of the second expansive agent is 100 kg. Use high-precision weighing equipment to ensure that the dosage of the second expansive agent meets the preset ratio.

[0077] More specifically, the measured second expansive agent is evenly added to the out-rib concrete mixture. Use mechanical mixing equipment to mix under controlled conditions to ensure the uniform distribution of the expansive agent in the concrete. The mixing time should be appropriately adjusted according to the efficiency of the mixer and the specifications of the concrete, usually no less than 5 minutes.

[0078] It should be understood that in this embodiment, through precise proportioning, the out-rib concrete can obtain sufficient expansion performance without sacrificing its bearing capacity, thereby improving the durability and stability of the entire structure. Moreover, it helps to improve the overall construction quality of the concrete, making it more suitable for use in complex engineering environments.

[0079] In the embodiment of the present invention, the steps of pouring the out-rib concrete into the first out-rib area and the second out-rib area, and pouring the in-rib concrete into the expansion reinforcement belt area include:

[0080] Step S41: First, use the out-of-zone concrete to pour the first out-of-zone area, and then use the out-of-zone concrete to pour the second out-of-zone area;

[0081] Step S42: Use the in-zone concrete to pour the expansion reinforcement belt area.

[0082] Specifically, during the construction of the basement, first pour the out-of-zone concrete on one side outside the expansion reinforcement belt (the first out-of-zone area), and process the contact surface formed by the out-of-zone concrete. Then pour the out-of-zone concrete on the other side outside the expansion reinforcement belt (the second out-of-zone area). Next, use a concrete with a higher strength grade added with a high-efficiency expansion agent to pour the area inside the expansion reinforcement belt. After pouring the out-of-zone concrete in the first out-of-zone area, when it reaches a certain strength, remove the first blocking device on this side. After removal, chisel the concrete contact surface, clean and moisten it. The purpose is to improve the density of the construction joint between the previously poured and the subsequently poured concrete as much as possible, reduce the pores caused by the separator on the contact surface of the out-of-zone concrete, and prevent water leakage. Then install the second blocking device, and then the bottom plate surface reinforcement can be tied up. Then pour the out-of-zone concrete and the in-zone concrete in the second out-of-zone area.

[0083] More specifically, the first blocking device is processed into a sawtooth shape using a template. Control the spacing of the sawteeth according to the design drawing, which is the spacing of the bottom plate reinforcement, and the width of each tooth should be the width of the bottom plate reinforcement diameter. First install the sawtooth template under the waterstop steel plate, reinforce it with "Z" - shaped bars, and weld and fix all of them on the stool bars or other measure bars. It is strictly prohibited to weld the main bars. Tie the sawtooth template and the "Z" - shaped bars firmly with binding wires. The waterstop steel plate is welded and fixed by a separate steel bar, with the opening facing the water-facing side. The sawtooth template above the waterstop steel plate is fixed in the same way as the lower part. After tying the bottom plate surface reinforcement, press a square timber. This device can be recycled and reused.

[0084] The second blocking device is formed by tying the quick - closing mesh to the pre - fabricated ladder bars. The dense vertical ladder bars form a strong interception net. The ladder bars are fixed entirely on the stool bars or other measure bars. It is strictly prohibited to weld the main bars. Tie the quick - closing steel wire mesh and the ladder bars firmly with binding wires. The ladder bars can not only ensure the protection layer and spacing of the bottom plate reinforcement, but also control the thickness of the bottom plate. The waterstop steel plate is welded and fixed by a separate steel bar, with the opening facing the water-facing side. After installing the waterstop steel plate and the upper and lower blocking devices, the second - stage concrete can be poured.

[0085] In the embodiment of the present invention, the steps of pouring the out-of-zone concrete into the first out-of-zone area and the second out-of-zone area, and pouring the in-zone concrete into the expansion reinforcement belt area include:

[0086] Step S410: Use the out-of-zone concrete to pour the first out-of-zone area;

[0087] Step S420, using the in-zone concrete to pour the expansion strengthening belt area;

[0088] Step S430, using the out-of-zone concrete to pour the second out-of-zone area.

[0089] In an embodiment of the present invention, the steps of pouring the out-of-zone concrete into the first out-of-zone area and the second out-of-zone area, and pouring the in-zone concrete into the expansion strengthening belt area include:

[0090] Step S401, using the out-of-zone concrete to pour the first out-of-zone area and the second out-of-zone area simultaneously;

[0091] Step S402, using the in-zone concrete to pour the expansion strengthening belt area.

[0092] Specifically, during the construction of the floor (roof) slab and beam, segmented pouring without time division is adopted. The concrete on both sides outside the expansion strengthening belt can be poured on one side first and then on the other side, and finally the in-zone concrete of the expansion strengthening belt is poured. It can also be gradually advanced and poured from one side to the other as a whole, or poured simultaneously on both sides, and finally the in-zone concrete is poured.

[0093] More specifically, for the construction of the floor (roof) slab, a continuous expansion strengthening belt is set. The beam steel bars need to be tied first, and then all the bottom bars of the floor (roof) slab are tied. Then, the third sealing device is installed and fixed on both sides of the expansion strengthening belt. Then, all the surface bars are tied and the concrete can be poured. For the expansion strengthening belt at the beam, the ladder bars need to be fixed first. The ladder bars at the beam do not need to be encrypted. First, insert the ladder bars into the beam steel bar framework, and then use an air-filled rod to insert them side by side along the ladder bars to the bottom of the beam as far as possible until there is no gap.

[0094] The third sealing device is tied with a quick-setting closing net to the processed encrypted ladder bars. The ladder bars need to be welded or tied firmly with the stool bars or measure bars, and are strictly prohibited from being welded with the slab bars.

[0095] In an embodiment of the present invention, after the steps of pouring the out-of-zone concrete into the first out-of-zone area and the second out-of-zone area, and pouring the in-zone concrete into the expansion strengthening belt area, the method further includes:

[0096] Step S60, using a vibrating rod to vibrate the out-of-zone concrete and the in-zone concrete.

[0097] Specifically, for the concrete pouring construction, the most important thing is to control the quality of the concrete entering the site. It is strictly mixed according to the designed mix ratio, and strictly controlled from the concrete raw materials. The strength, particle size, and mud content of the coarse and fine aggregates are selected. The particle size of the stone is 5 - 35 mm, and it is strictly screened at the material yard. The fine aggregate is selected with a dry density of 1500 kg / m3 Medium (coarse) sand. As for the type of cement, 42.5 ordinary Portland cement is preferably selected as much as possible.

[0098] In order to meet the requirements of pumped concrete, as well as factors such as the impermeability of the structure and the mitigation of shrinkage creep, a high-efficiency UEA expansion agent is mainly selected in the concrete batching. Judging from the test results, in addition to having the effect of improving the shrinkage of concrete, UEA also has the beneficial effect of improving the pumpability.

[0099] The key to the concrete pouring of the inside and outside of the expansion strengthening belt is the concrete density. It is necessary to vibrate the concrete thoroughly, without over-vibrating or missing vibration. When using an inserted vibrator to vibrate vertical members or a relatively thick bottom plate, pay attention to inserting quickly and pulling out slowly. Especially when the concrete underflows and fills up under the water-stop steel plate, pay attention that no more bubbles are generated and the concrete no longer sinks, and the slurry appears.

[0100] The concrete vibrator selected is type small vibrator, vibrate in sequence, and the moving distance of the vibrator is not greater than 1.25 times of the vibration effect. When vibrating the upper layer of concrete, insert it 50mm into the lower layer to eliminate cold joints.

[0101] During the pouring process, do a good job in the sampling of test blocks and the test of slump, and strictly control the slump to avoid affecting the pouring density.

[0102] The concrete of the expansion strengthening belt should be cured in time after the pouring of other parts is completed. For the bottom plate and top plate parts, the plastic film covering method is adopted, that is, cover a layer of film and often water it on it to keep it in a moist state for 14d. During the form removal period of the wall columns, try to reduce the exposure time of the concrete, cover it with a plastic film while removing the form, and water it at any time to keep it moist.

[0103] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural transformations made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A concrete construction method for expansion reinforcement belt, characterized in that: include: A first outer zone and a second outer zone of the expansion reinforcement zone are formed on the structural surface; the expansion reinforcement zone is arranged between the first outer zone and the second outer zone; separating the first out-of-band area, the expansion reinforcement band area, and the second out-of-band area; Configure inner and outer concrete; pouring the outer-belt concrete into the first outer-belt area and the second outer-belt area, and pouring the inner-belt concrete into the expansion reinforcement belt area; The first out-of-band area, the expansion reinforcement band area and the second out-of-band area are connected to form the expansion reinforcement band.

2. The concrete construction method for expansion reinforcement strip according to claim 1, characterized in that: The steps of configuring the inner concrete and the outer concrete include: The target stone is obtained by screening according to the preset particle size; Screening to obtain target fine aggregate according to preset dry density; Obtaining initial concrete using concrete batching, the target stone and the target fine aggregate; Adding a first expansion agent to part of the initial concrete according to a first preset ratio to obtain the in-band concrete; A second expansion agent is added to another portion of the initial concrete according to a second preset ratio to obtain the out-of-band concrete.

3. The concrete construction method applied to the expansion reinforcement belt according to claim 2, characterized in that: The preset particle size is D, 5mm≤D≤35mm.

4. The concrete construction method for expansion reinforcement strip according to claim 2, characterized in that: The preset dry density is 1500kg / m 3 .

5. The concrete construction method applied to the expansion reinforcement belt according to claim 2, characterized in that: The first preset mix ratio is A, where A=total mass of the first expansion agent:total mass of the concrete in the belt=0.12:

1.

6. The concrete construction method for expansion reinforcement strip according to claim 2, characterized in that: The second preset mix ratio is B, where B=total mass of the second expansion agent:total mass of the outer concrete=0.1:

1.

7. The concrete construction method applied to the expansion reinforcement strip according to any one of claims 1 to 6, characterized in that: The steps of pouring the outer-belt concrete into the first outer-belt area and the second outer-belt area, and pouring the inner-belt concrete into the expansion reinforcement belt area include: Firstly, the first out-of-belt area is casted with the out-of-belt concrete, and then the second out-of-belt area is casted with the out-of-belt concrete; The expansion reinforcement zone area is cast using the concrete in the zone.

8. The concrete construction method applied to the expansion reinforcement strip according to any one of claims 1 to 6, characterized in that: The steps of pouring the outer-belt concrete into the first outer-belt area and the second outer-belt area, and pouring the inner-belt concrete into the expansion reinforcement belt area include: pouring the first out-of-band area with the out-of-band concrete; pouring the expansion reinforcement belt area with the concrete in the belt; The second out-of-band area is cast with the out-of-band concrete.

9. The concrete construction method applied to the expansion reinforcement strip according to any one of claims 1 to 6, characterized in that: The steps of pouring the outer-belt concrete into the first outer-belt area and the second outer-belt area, and pouring the inner-belt concrete into the expansion reinforcement belt area include: Using the out-of-band concrete to simultaneously cast the first out-of-band area and the second out-of-band area; The expansion reinforcement zone area is cast using the concrete in the zone.

10. The concrete construction method applied to the expansion reinforcement strip according to any one of claims 1 to 6, characterized in that: After the steps of pouring the outer-belt concrete into the first outer-belt area and the second outer-belt area, and pouring the inner-belt concrete into the expansion reinforcement belt area, the method further comprises: The concrete outside the belt and the concrete inside the belt are vibrated by using a vibrating rod.

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