High-performance concrete fabricated channel structure

Abstract

The invention relates to the technical field of expressway channels, in particular to a high-performance concrete assembly type channel structure. Comprising a channel foundation replacement layer arranged on the ground, a side wall installation cushion layer is laid on the channel foundation replacement layer, prefabricated side walls are installed through the side wall installation cushion layer, a prefabricated top plate is placed between the tops of the prefabricated side walls, and a cast-in-place bottom plate is poured at the bottoms of the prefabricated side walls; and the prefabricated top plate and the prefabricated bottom plate are prepared by adopting a groove-shaped section and a pre-tensioning pre-stress process. The prefabricated side walls, the cast-in-place bottom plates and the prefabricated top plates are assembled to form channel culvert sections. By adopting factory prefabrication and on-site assembly of the prefabricated side wall and the prefabricated top plate, the construction quality can be effectively guaranteed, and the construction period is shortened.

Description

Technical Field

[0001] The invention relates to the technical field of highway passages, and in particular to a high-performance concrete assembled passage structure. Background Art

[0002] Among highway bridge and culvert structures, channels are characterized by large number and wide distribution. They are small structures with drainage and traffic functions. Their construction progress and construction quality are related to the construction period and quality of the entire highway.

[0003] At present, the construction of new roads, reconstruction and extension channels is usually cast in place, with scattered construction sites and non-uniform construction conditions, which makes it difficult to control the structural construction process and ensure the structural quality during the casting and maintenance process. In addition, field construction is affected by weather, terrain, concrete age, material transportation, etc., and the construction progress is slow. Therefore, the use of standardized design, factory prefabrication, and on-site assembly technology can ensure the quality of the structure itself, improve the construction progress, and reduce environmental pollution.

[0004] Based on the above situation, some prefabricated box-type channels have also appeared in China. This type of channel is designed based on the existing box culvert. The top plate and side wall dimensions are completely different, and the degree of standardization is low. In fact, it is simply moving the field cast-in-place process into the factory. In addition, its cross-sectional dimensions are large, the structure has a high deadweight, which is not conducive to on-site assembly; the material consumption is large, resulting in a higher cost than the cast-in-place box-type channel.

[0005] The top plate and side walls of traditional box-type passages are rectangular in cross-section, and the ultimate bearing capacity of concrete bending members is determined by the beam height. Therefore, the cross-sectional dimensions per linear meter are basically fixed under a given fill height, and it is difficult to significantly reduce the amount of material under rectangular cross-sectional conditions. However, when the structure is subjected to stress, except for the tension and compression zones at the top and bottom of the cross-section, the remaining cross-sections participate in the stress very little, and the material utilization efficiency is low. The excess material increases the deadweight of the structure and increases the cost of the structure. Summary of the invention

[0006] In view of the above-mentioned deficiencies in the prior art, the present invention provides a high-performance concrete assembled channel structure, which has reasonable structure design, simple construction, low cost, and is prefabricated in a factory and assembled on site, which can effectively ensure construction quality and shorten construction period.

[0007] The technical solution of the present invention is as follows:

[0008] A high-performance concrete assembled channel structure, comprising a channel foundation replacement layer arranged on the ground, a side wall installation cushion layer laid on the channel foundation replacement layer, a prefabricated side wall installed through the side wall installation cushion layer, a prefabricated top plate placed between the tops of the prefabricated side walls, and a cast-in-place bottom plate cast at the bottom of the prefabricated side walls; a channel culvert section is formed by assembling the prefabricated side walls, the cast-in-place bottom plate and the prefabricated top plate;

[0009] Furthermore, the prefabricated side wall includes a corner toe, a side wall and a corbel that are cast in sequence, and a side wall stiffening rib is arranged on the side wall.

[0010] Furthermore, the prefabricated top plate includes an integrally formed top plate wall, and top plate stiffening ribs are arranged on the top plate wall.

[0011] Furthermore, the corner toes of the prefabricated side walls and the upper part of the side wall are provided with side wall shear keys for pouring the post-cast strips of the side walls.

[0012] Furthermore, top plate shear keys are provided at both ends of the top plate wall of the prefabricated top plate for pouring the top plate post-cast strip.

[0013] Furthermore, mutually intertwined connecting shear keys are provided between the side wall post-cast strip and the top plate post-cast strip for pouring the connecting post-cast strip.

[0014] Furthermore, waterproof rubber strips are arranged between adjacent prefabricated side walls and adjacent prefabricated top plates of the channel. The waterproof rubber strips are butterfly-shaped rubber waterstops, and the outer side of the waterproof rubber strips is wrapped with asphalt oil felt.

[0015] Furthermore, the prefabricated side walls, prefabricated top plates and side wall post-cast strips are made of high-performance concrete.

[0016] The beneficial effects of the present invention are:

[0017] 1. Factory prefabrication, easy to ensure construction quality. The main load-bearing components of the present invention, the top plate and side walls, are all factory prefabricated, and the overall quality of the structure is easy to ensure. It fundamentally avoids the durability problems caused by the difficulty in ensuring the construction quality of traditional concrete channel structures. The new structure is built intensively in the factory to avoid construction stage diseases caused by inadequate curing of on-site concrete pouring, and the quality is higher and more reliable.

[0018] 2. Reasonable structural design and high material utilization efficiency. Analysis shows that the rectangular cross-section of the traditional channel structure has little force except for the top and bottom tension and compression areas. The proposed new channel structure adopts high-strength and high-durability new materials, and removes all the parts with less stress in the rectangular cross-section of the top plate and side wall of the traditional channel, which greatly reduces the cross-sectional area. The main material consumption is 1 / 10 of that of the traditional channel, which increases the cross-sectional stress and significantly improves the material utilization efficiency. It fundamentally avoids the durability problem caused by the low material performance of the traditional concrete channel structure.

[0019] 3. The new structure has a 30% to 50% lower deadweight than traditional concrete cover culverts and box culverts, making transportation and installation more convenient and efficient. At the same time, the structure has good integrity, low requirements on foundation bearing capacity, and a wide range of applications.

[0020] 4. The new structure adopts a high-performance prestressed concrete system, and the thickness of the plate is 30% to 50% lower than that of the traditional concrete box culvert and cover culvert, which greatly reduces the amount of concrete and steel bars. At the same time, intensive production and construction, on-site assembly construction, reduce the investment in on-site brackets, formwork and concrete maintenance facilities, improve construction efficiency, reduce the impact of the construction process on the surrounding environment and existing traffic, and reduce carbon emissions throughout the process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The installation diagram of a high-performance concrete assembled channel structure of the present invention is shown in FIG. Figure 1 .

[0022] Figure 2 A schematic diagram of the installation of a high-performance concrete prefabricated channel structure Figure 2 ;

[0023] Figure 3 This is a schematic diagram of the prefabricated side wall structure of the present invention;

[0024] Figure 4 This is a schematic diagram of the prefabricated top plate structure of the present invention;

[0025] Figure 5 This is a schematic diagram of the installation of the waterproof rubber strip of the present invention.

[0026] As shown in the figure: channel foundation replacement layer 1, side wall installation cushion layer 2, prefabricated side wall 3, corner toe 301, side wall wall 302, side wall stiffening rib 303, corbel 304, side wall shear key 305, cast-in-place bottom plate 4, prefabricated top plate 5, top plate wall 501, top plate stiffening rib 502, top plate shear key 503, side wall post-cast strip 6, top plate post-cast strip 7, connecting shear key 8, connecting post-cast strip 9, waterproof rubber strip 10. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific embodiments:

[0028] Example 1

[0029] like Figure 1-Figure 5 As shown, the present invention provides a high-performance concrete assembled channel structure. By installing prefabricated side walls 3, cast-in-place bottom plates 4 and prefabricated top plates 5, the purpose of factory pre-support and on-site assembly is achieved.

[0030] First, the channel foundation replacement layer 1 is constructed. A foundation pit for the channel is excavated on the ground, and the foundation is treated according to the design requirements to ensure that the foundation bearing capacity meets the structural requirements. Then, the channel foundation replacement layer is laid on the treated foundation. The replacement layer is usually composed of crushed stone, sand or other suitable materials to improve the uniformity and bearing capacity of the foundation.

[0031] The side wall installation cushion layer 2 is laid on the channel foundation replacement layer 1. The function of the cushion layer is to provide stable support and precise positioning for the prefabricated side wall 3. The material of the installation cushion layer 2 is usually selected from granular materials compatible with the channel foundation replacement layer 1 to ensure the stability of the side wall.

[0032] The prefabricated side wall 3 is prefabricated in the factory according to the design requirements. The prefabricated side wall 3 is prepared by using a groove section and a prestressing process. The structure includes a corner toe 301, a side wall 302 and a corbel 304. The corner toe 301 and the upper part of the side wall 302 of the prefabricated side wall are provided with side wall shear keys 305, which are used to connect with the post-casting strip 6 in subsequent construction. The side wall 302 of the prefabricated side wall is provided with a side wall stiffening rib 303 to enhance the structural strength of the side wall.

[0033] The prefabricated side walls 3 are accurately placed on the side wall installation cushion layer 2 by means of hoisting equipment and initially fixed. Horizontal and vertical adjustments are made between the prefabricated side walls 3 and between the prefabricated side walls 3 and the channel foundation replacement layer 1 to ensure that the position of the side walls is accurate.

[0034] After the prefabricated side wall 3 is installed and adjusted, the cast-in-place bottom plate 4 is constructed. The cast-in-place bottom plate 4 is made of ordinary concrete material. The thickness and strength of the cast-in-place bottom plate 4 are determined according to the design requirements and load conditions. Before pouring the bottom plate concrete, the bottom of the side wall needs to be cleaned to ensure that there is no debris between the cast-in-place bottom plate 4 and the prefabricated side wall 3 to ensure the bonding performance between the two.

[0035] When pouring the base slab concrete, attention should be paid to the uniformity and density of the concrete to avoid voids and cracks. After pouring, maintenance should be carried out to ensure that the concrete reaches the designed strength.

[0036] After the cast-in-place bottom plate 4 reaches the design strength, the installation of the prefabricated top plate 5 begins. The prefabricated top plate 5 is prefabricated in the factory according to the design requirements and is prepared using a groove section and prestressing process. The prefabricated top plate 5 includes an integrally formed top plate wall 501, on which top plate stiffening ribs 502 and top plate shear keys 503 at both ends are provided. The installation of the top plate is similar to that of the side wall. The prefabricated top plate is placed on the top of the side wall by a hoisting device, and the hook-shaped steel bars protruding from the top of the prefabricated side wall 3 are tied together with the steel bars of the prefabricated top plate 5 for preliminary fixation.

[0037] After the installation of the prefabricated side walls and top slabs is completed, the construction of the side wall post-casting strip 6, the top slab post-casting strip 7 and the connecting post-casting strip 9 is carried out. A mutually intertwined connecting shear key 8 is set between the side wall post-casting strip 6 and the top slab post-casting strip 7 for casting the connecting post-casting strip 9. The side wall post-casting strip 6, the top slab post-casting strip 7 and the connecting post-casting strip 9 adopt the principle of integrated casting. The post-casting strip is a key structure connecting the prefabricated components and the cast-in-place part. By setting the shear key and the connecting key, the stability and seismic performance of the overall structure are ensured. The connecting post-casting strip 9 ensures the rigidity of the corner part.

[0038] The concrete of the post-cast strip is also made of UHPC material to ensure the consistency and performance of the overall structure. When pouring, attention should be paid to the fluidity and density of the concrete to ensure good bonding between the post-cast strip and the prefabricated components.

[0039] In order to improve the waterproof performance of the channel structure, waterproof rubber strips 10 are arranged between adjacent prefabricated side walls 3 and adjacent prefabricated top plates 5. The waterproof rubber strips are butterfly-shaped rubber waterstops, and the outer side of the waterproof rubber strips is wrapped with asphalt oil felt, which can effectively fill the gaps between components and prevent water penetration.

[0040] After all components are installed and the post-cast concrete is cured, the overall structure inspection is carried out. The inspection content includes the verticality and horizontality of the structure, the connection quality between components, waterproof performance, etc. Ensure that all indicators meet the design requirements and relevant standards.

[0041] After the structural inspection is passed, the span of the channel is 4, 6, 8, 10m, and 12m, and the interior decoration of the channel is carried out, including painting of the walls and ceilings, installation of lighting facilities, decoration of the interior of the channel, etc. The decoration work should take into account the use function and aesthetics of the channel.

[0042] Through the above implementation, the high-performance concrete assembled channel structure of the present invention has the advantages of short construction period, controllable quality, strong durability, etc. The structure is suitable for the construction of urban underground passages, culverts and other similar projects, and can effectively improve the construction efficiency and service life of the project.

[0043] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0044] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A high-performance concrete assembled channel structure, comprising a channel foundation replacement layer arranged on the ground, characterized in that: A side wall installation cushion is laid on the channel foundation replacement layer, a prefabricated side wall is installed through the side wall installation cushion, a prefabricated top plate is placed between the tops of the prefabricated side walls, and a cast-in-place bottom plate is cast at the bottom of the prefabricated side walls; a channel culvert section is formed by assembling the prefabricated side wall, the cast-in-place bottom plate and the prefabricated top plate; Wherein, the prefabricated side wall comprises a corner toe, a side wall and a corbel which are cast in sequence, and a side wall stiffening rib is arranged on the side wall; Wherein, the prefabricated top plate comprises an integrally formed top plate wall, and top plate stiffening ribs are arranged on the top plate wall.

2. A high performance concrete assembled channel structure according to claim 1, characterized in that: The corner toes of the prefabricated side walls and the upper part of the side wall are provided with side wall shear keys for pouring the post-cast strips of the side walls.

3. A high performance concrete assembled channel structure according to claim 2, characterized in that: Top plate shear keys are arranged at both ends of the top plate wall of the prefabricated top plate for pouring the top plate post-cast strip.

4. A high performance concrete assembled channel structure according to claim 3, characterized in that: Intertwined connecting shear keys are arranged between the side wall post-cast strip and the top plate post-cast strip, and are used for pouring the connecting post-cast strip.

5. A high performance concrete assembled channel structure according to any one of claims 1 to 4, characterized in that: Waterproof rubber strips are arranged between adjacent prefabricated side walls and adjacent prefabricated top plates of the passage. The waterproof rubber strips are butterfly-shaped rubber waterstops, and the outer sides of the waterproof rubber strips are wrapped with asphalt oil felt.

6. A high performance concrete assembled channel structure according to any one of claims 1 to 4, characterized in that: The prefabricated side walls, prefabricated top plates and side wall post-cast strips are made of high-performance concrete.

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