[0024] Prefabricated box culvert is also called prefabricated box culvert. It is a prefabricated reinforced concrete box structure that can be used as a large-scale flood channel, urban rain and sewage pipeline, large-scale water storage tank, integrated pipe gallery, underground pedestrian passage, and motor vehicle underground Municipal construction such as tunnels and small garages. The most common shape of prefabricated box culverts is square, but in addition to square box culverts, according to the use requirements, stress conditions, address foundation, construction and manufacturing conditions, etc., there are also rectangular and U-shaped box culverts on the basis of square box culverts. Cover plate, two U-shaped splicing, one side or upper and lower arch, single hole or porous culvert, etc. shapes. Compared with cast-in-place construction, prefabricated box culvert 1 can shorten the construction time and promote civilized and green construction; it can be used for trenchless jacking construction; during excavation construction, the working surface is small and construction can be carried out with water; Flexible interface, resistant to uneven foundation settlement; prefabrication process control, finished product factory inspection, product quality is guaranteed; construction and maintenance costs are reduced, and the overall cost is low.
[0025] Generally, box culvert construction uses on-site tying of steel bars, formwork, and concrete pouring. The construction period is long. In projects with short construction period, the use of prefabricated box culverts can greatly shorten the construction period. The four edges of the box culvert are reserved with 5cm*5cm chamfers. After the box culvert is spliced, a right-angle groove will be formed at the splicing part. The rubber waterstop is wrapped in the groove. Most of the rubber waterstop will be Filled into the groove, but the rubber waterstop is a rubber material with a certain degree of hardness, so a small part of the wound rubber waterstop cannot be filled into the groove, thus forming a non-existent splicing box culvert. Flat state.
[0026] Exemplary, such as figure 1 Shown here is a construction drawing of a method for improving the installation accuracy and construction progress of the prefabricated box culvert 1 provided by this application, and the method includes:
[0027] S1. Perform foundation construction on the bottom layer where the prefabricated box culvert is placed. The foundation construction includes the on-site assembly of the prefabricated box culvert 1 and the treatment of the external environment of the prefabricated box culvert 1. Since the prefabricated box culvert 1 is suitable for a variety of environments and is made of concrete pouring, its quality Larger. If the factory is successfully transported to the site at one time, the transportation requirements will be relatively high. In addition, it is large in quality and bulky, requiring special lifting facilities for loading and unloading, which will increase transportation costs, so prefabricated The box culvert 1 will be made into the state of section by section according to the design requirements in the factory, and then transported to the site, and then assembled, which can save a lot of manpower, material and financial resources.
[0028] After assembled, the prefabricated box culvert 1 will be placed in a special use environment. The general environment is a culvert excavated by mechanical equipment. The internal surface is mostly a mixture of soil and sand, and the four edges of the box culvert are reserved. There is a chamfer of 5cm*5cm. After the box culvert is spliced, a right-angle groove will be formed at the splicing part. The rubber waterstop is wrapped in the groove. Most of the rubber waterstop will fill the groove, but the rubber The waterstop is a rubber material with a certain degree of hardness, so a small part of the wound rubber waterstop cannot be filled into the groove, which will also cause the unevenness of the splicing box culvert. In order to make the assembly prefabricated The placement position of the box culvert 1 remains relatively flat in the above two cases and needs to meet the design elevation, so the surface environment inside the culvert must be treated first. The general treatment method is to lay a gravel cushion 4 on the bottom surface of the culvert. The thickness of the cushion is controlled according to specific construction requirements. Because the cushion is mostly sand, stone, concrete cushions and other common gravel cushions on site, it is Under the action of external force, displacement will occur. In order to preliminarily shape the bottom surface of the culvert, C30 cement concrete will be used to pour the upper part of the gravel cushion 4 to ensure a stable overall shape.
[0029] S2. After the foundation construction of the prefabricated box culvert 1 is carried out, a height of not less than 10 cm is reserved at the bottom of the prefabricated box culvert 1 to obtain a space-2, and the space-2 is not subjected to concrete pouring. The design of this step is to adjust the elevation according to the design requirements before filling the concrete, and then fill the space 2 with concrete, so that it can save the labor of repeatedly repairing and adjusting the elevation, and there is no need to repeatedly repair the foundation for adjustment. No need to wait for the repair mortar or concrete to reach a certain strength before installation, which saves time to a certain extent.
[0030] S3. According to the weight of the section 1 of the prefabricated box culvert, a cushion block of equal strength is placed in the space one, and the thickness of the cushion block is set according to the elevation. Because the elevation of the internal design of the culvert is mainly for drainage, the slope will not be very large. According to the design requirements, a height of 10cm will be reserved. The method of reservation is to lay on the laid concrete foundation 3 before placing the prefabricated box. A layer of concrete pad, scrap steel plate or a mixture of concrete pad and scrap steel plate. The thickness of concrete pad, scrap steel plate or a mixture of concrete pad and scrap steel plate is different over a certain distance Yes, because the bottom surface of the culvert needs a certain slope for drainage, this elevation is calculated based on the data on the site, and only needs to be laid according to the requirements during site construction.
[0031] S4. Set concrete pouring holes and overflow prevention holes at the bottom of the fabricated prefabricated box culvert 1, and place the fabricated prefabricated box culvert 1 on the space one. The purpose of adding concrete pouring holes is to pour the self-compacting concrete later, because the side form will be installed next to the bottom of the prefabricated box culvert 1. After the side form is installed, the pouring of the self-compacting concrete needs to rely on assembly The concrete pouring hole at the bottom of the prefabricated box culvert 1 is completed. At the same time, in order to facilitate the understanding of whether the self-compacting concrete has been poured, the present application also provides an anti-overflow hole at the bottom of the prefabricated box culvert. The position of the anti-overflow hole is generally set at the top of the bottom of the prefabricated box culvert 1. The purpose is to ensure that the space has been poured, the number of concrete pouring holes and overflow prevention holes is set according to the specific length of each section of the prefabricated box culvert 1.
[0032] S5. A side form is supported on the edge of the space one, the height of the side form is set according to the elevation, and finally the space one is poured with self-compacting concrete to the design elevation. After the gravel cushion is laid, place the side mold on the edge of the space one, which is the edge of the gravel cushion. The purpose of placing the side mold is to prevent the paved gravel cushion from being subjected to the force of the prefabricated box. Displacement to an unnecessary place, preventing subsequent poured concrete from overflowing from the side. After the prefabricated box culvert 1 is placed, the space 1 can be self-compacting concrete. The purpose of choosing self-compacting concrete here is that the anti-segregation performance, fluidity and filling performance of self-compacting concrete are better than ordinary concrete. No need for vibrating, good self-compacting performance, and it can save labor and labor intensity compared with conventional repeated repair and adjustment.
[0033] Optionally, the method further includes adjusting the elevation according to design requirements before pouring the space 2 with self-compacting concrete. Before installing the prefabricated box, the construction staff will go to the site to conduct a site survey to understand the on-site environment. According to the measured data, the required data will be calculated in advance to facilitate the subsequent on-site construction.
[0034] Optionally, the pad used in step S3 includes concrete pads and small scrap steel plates. These items are easily obtainable wastes. Recycling these wastes can save costs. In addition, the concrete pads and scrap steel plates have certain strength and are placed at the bottom of the prefabricated box culvert 1. It can bear a certain weight to prevent ordinary stones from being crushed after being placed and affecting the laying effect.
[0035] Before filling the concrete, adjust the elevation according to the design requirements, and then fill the concrete to the design elevation at one time. There is no need to repeatedly repair the foundation to adjust, and there is no need to wait for the repair mortar or concrete to reach a certain strength before installation. Use self-compacting concrete to fill the space. After one or two, fill and pour the sides and top of the prefabricated box, and the prefabricated box can be well fixed inside the culvert for use.
[0036] The present application provides a method for improving the installation accuracy and construction progress of the prefabricated box culvert. The method includes: S1, performing foundation construction on the bottom layer where the prefabricated box culvert is placed; After the foundation construction of the box culvert, a height of not less than 10cm is reserved at the bottom of the prefabricated box culvert to obtain space one, and no concrete is placed in the space one; S3. According to the weight of the prefabricated box culvert segment , Place a cushion block of equal strength in the first space, and the thickness of the cushion block is set according to the elevation; S4. Set concrete pouring holes and overflow prevention holes at the bottom of the prefabricated box culvert, and place the The prefabricated box culvert is placed on the space one; S5. A side form is supported on the edge of the space one, and the height of the side form is set according to the elevation, and finally the space is poured with self-compacting concrete. Design elevation. This method adjusts the elevation according to the design requirements before filling the concrete, and then fills the concrete. The elevation meets the design requirements, eliminating the need for repeated repairs to adjust the elevation. Self-compacting concrete has anti-segregation performance, fluidity and filling The performance is better than ordinary concrete. It does not require vibrating and has good self-compacting performance. Compared with conventional repeated repair and adjustment of elevation, it can save labor and labor intensity. It can reach the design elevation at one time. There is no need to repeatedly repair the foundation for adjustment. Installation after the concrete reaches a certain strength saves time to a certain extent. It solves the problem of low installation accuracy of prefabricated box culvert and long construction period for repairing.
[0037] It should be noted that terms such as "include", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or device that includes a series of elements not only includes those elements, but also includes those that are not explicitly listed. Other elements of, or also include elements inherent to this process, method, article or equipment. If there are no more restrictions, the element defined by the sentence "including a..." does not exclude the existence of other same elements in the process, method, article, or equipment including the element.
[0038] The above are only specific implementations of the application, so that those skilled in the art can understand or implement the application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the application. Therefore, this application will not be limited to the embodiments shown in this text, but should conform to the widest scope consistent with the principles and novel features disclosed in this text.
[0039] It should be understood that this application is not limited to what has been described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the application is only limited by the appended claims.
