Pre-cast wall body and base connection structure for breakwater

Abstract

The utility model discloses a kind of prefabricated wall and bottom plate foundation connecting structure of anti-wave wall, the bottom of bottom plate foundation is formed tenon downwards, prefabricated wall is formed in the bottom of prefabricated wall and is inserted into tenon by reserving reinforcing bar downwards from vertical stress reinforcement of river side and retaining side in prefabricated wall, before pouring bottom plate foundation, according to the position of corresponding reserved reinforcing bar, metal bellows pipe is embedded, one side of metal bellows pipe is equipped with metal grouting pipe of communication with it and being arranged obliquely upwards, the top of the mouth of metal bellows pipe and metal grouting pipe is flush with the top surface of corresponding position of bottom plate foundation.Compared with conventional socket connection mode, the utility model is connected by high-strength non-shrinkage grouting material by reserved reinforcing bar of prefabricated wall and metal bellows pipe embedded in bottom plate foundation, and by setting concave-convex butt joint surface and interval in connecting position, it is guaranteed that grouting material is filled dense, the bonding quality of connecting part is improved, the connecting strength, durability and stability between prefabricated wall and bottom plate foundation are effectively guaranteed;Compared with bottom plate foundation reserved two-stage concrete pouring groove mode, the present connecting structure is simple in construction, easy to operate, little by construction environment, can effectively shorten construction period, and engineering construction efficiency and construction quality are greatly improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of river embankment engineering in the water conservancy industry, specifically relating to a connection structure between a prefabricated wave wall and a foundation slab. Background Technology

[0002] In the field of river embankment engineering, wave walls, as important protective facilities, are widely used, primarily in the form of masonry and cast-in-place reinforced concrete structures. However, with increasing service life and inadequate maintenance, most existing wave walls have developed cracks and localized damage, severely affecting their appearance and project quality. In contrast, precast concrete structures offer high construction efficiency, stable and reliable quality, aesthetically pleasing designs, and ease of maintenance and replacement, making them a new development trend and gradually being promoted and applied in the market.

[0003] Wave walls are mostly cantilevered reinforced concrete retaining wall structures. The wall and its lower slab are precast components, resulting in a large volume and making hoisting and transportation difficult. It is advisable to fabricate the wall and lower slab separately and then connect them. In actual projects, due to limitations imposed by existing conditions or special node layouts, the foundation plan of the slab is often designed with an irregular shape. If precast components are used, the irregularly shaped formwork cannot be reused, affecting production efficiency and increasing costs. Therefore, irregularly shaped slabs use cast-in-place concrete structures. The precast wall and cast-in-place slab are conventionally connected using a socket joint or a pre-reserved secondary concrete pouring trench. Since wave walls are cantilevered retaining wall structures, they are subjected to earth pressure behind them, and the connection between the wall and the slab bears the greatest bending moment. Socket joints are mainly used for compression members, but their reliability is poor for bending members. The method of reserving a second-stage concrete pouring trench can ensure the stress requirements of the connection part, but it requires roughening, cleaning debris, straightening steel bars, formwork support and dismantling, concrete curing and other procedures, which results in a long construction period and high requirements for the construction environment, temperature and process. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a connection structure between the prefabricated wave-breaking wall and the foundation slab to overcome the shortcomings of the prior art.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0006] A connection structure between a precast wave-breaking wall and a foundation slab is provided, applicable to the connection between the precast wall and the foundation slab. The bottom of the foundation slab extends downward to form a tenon. Vertical reinforcing bars on the river-facing and retaining sides of the precast wall extend downward from the bottom surface of the precast wall to form pre-reserved reinforcing bars that extend into the tenon. Before pouring the foundation slab, corrugated metal pipes are pre-embedded according to the positions corresponding to the pre-reserved reinforcing bars. A metal grouting pipe is provided on one side of the corrugated metal pipe, and the corrugated metal pipe and the grouting pipe are interconnected. The top of the openings of the corrugated metal pipe and the grouting pipe are flush with the top surface of the foundation slab at the corresponding positions.

[0007] As described in the prefabricated wave wall and base slab foundation connection structure, a groove is provided at the docking position between the top surface of the base slab foundation and the prefabricated wall, the bottom surface of the prefabricated wall is located in the groove and a certain gap is maintained between it and the top surface of the base slab foundation. After the prefabricated wall is fixed, high-strength non-shrink grout is injected into the metal corrugated pipe, the groove and the gap through the metal grouting pipe.

[0008] As described in the wave-breaking wall prefabricated wall and base slab foundation connection structure, the bottom of the prefabricated wall is provided with a first positioning component, and one side of the prefabricated wall is provided with a second positioning component.

[0009] The beneficial effects of this utility model's technical solution are:

[0010] Compared with conventional socket connection methods, this utility model uses high-strength, non-shrink grout to connect the pre-reserved reinforcing bars in the precast wall and the corrugated metal pipes embedded in the foundation slab. By setting concave and convex mating surfaces and intervals at the connection points, it ensures that the grout fills the gaps tightly, improving the bonding quality of the connection and effectively guaranteeing the connection strength, durability, and stability between the precast wall and the foundation slab. Compared with the method of reserving a secondary concrete pouring trench in the foundation slab, this connection structure is simple to construct, easy to operate, and less affected by the construction environment, which can effectively shorten the construction period and greatly improve the construction efficiency and quality. Attached Figure Description

[0011] To further illustrate the above-mentioned objectives, structural features, and effects of this utility model, the following will describe this utility model in detail with reference to the accompanying drawings.

[0012] Figure 1 This is a schematic diagram of the cross-sectional structure of the wave-breaking wall according to a preferred embodiment of the present invention;

[0013] Figure 2 This is a schematic diagram of the connection structure between the precast wall and the foundation slab in a preferred embodiment of this utility model.

[0014] Figure 3This is a partial enlarged view of the connection surface between the precast wall and the foundation slab in a preferred embodiment of this utility model.

[0015] In the diagram: 1. Precast wall; 2. Foundation slab; 3. Tenon; 4. Reserved reinforcing bar; 5. Corrugated metal pipe; 6. Metal grouting pipe; 7. Groove; 8. Spacing; 9. High-strength non-shrink grout; 10. High-strength bolt; 11. First embedded nut; 12. Temporary angle steel support; 13. Second embedded nut; 14. Temporary diagonal bracing steel pipe; 15. Riverside walkway; 16. Embankment road; 17. Plain concrete cushion layer. Detailed Implementation

[0016] The terms “utility model” and “this utility model” used in this specification are intended to broadly refer to all subject matter of this specification and any of the following patent claims. Statements containing these terms should not be construed as limiting the subject matter described herein or limiting the meaning or scope of any of the following patent claims. Furthermore, this specification does not attempt to describe or limit the subject matter covered by any claim of any particular component, paragraph, statement, or drawing of this application. The subject matter should be understood with reference to the entire specification, all drawings, and any of the following claims. This utility model may have other embodiments and be practiced or implemented in other ways. Moreover, it should be understood that the wording and terminology used herein are for illustrative purposes and should not be considered limiting.

[0017] The details of the present invention will now be discussed with reference to the accompanying drawings, which are illustrated by way of example only. In the drawings, similar features or components may be labeled with the same reference numerals.

[0018] The use of the terms "comprising," "having," and "including," and variations thereof, herein means to include the items listed herein, their equivalents, and additional items. While reference may be made in the description of the drawings to directions such as above, below, upward, downward, backward, bottom, top, front, rear, etc., for convenience, reference is made relative to the drawings. These directions are not intended to literally accept or limit the invention in any form. Furthermore, terms such as "first," "second," "third," etc., are used herein for illustrative purposes and are not intended to indicate or imply importance or significance.

[0019] See Figures 1 to 3As shown, the connection structure between the precast wave-breaking wall and the foundation slab of this utility model is applied to the connection between the precast wall 1 and the foundation slab 2. The bottom of the foundation slab 2 extends downward to form a tenon 3, which is anti-slip. The vertical reinforcing bars on the river-facing side and the retaining side of the precast wall 1 extend downward from the bottom surface of the precast wall 1 to form reserved reinforcing bars 4, which extend into the tenon 3. Before pouring the foundation slab 2, metal corrugated pipes 5 are pre-embedded according to the position of the corresponding reserved reinforcing bars 4, ensuring that the reserved reinforcing bars 4 and the metal corrugated pipes 5 are as center-aligned as possible, with a center error of no more than ±5mm. The inner diameter of the corrugated metal pipe 5 is determined by expanding outwards by 20-30mm from the diameter of the reserved reinforcing bar 4. The bottom of the corrugated metal pipe 5 is 30-50mm away from the bottom end of the reserved reinforcing bar 4. The bottom of the corrugated metal pipe 5 needs to be sealed. A 20-30mm diameter metal grouting pipe 6 is provided on one side of the corrugated metal pipe 5, which is arranged obliquely upwards. The corrugated metal pipe 5 and the grouting pipe 6 are interconnected, and the connection point is located in the middle or slightly above the middle of the corrugated metal pipe 5. The top of the pipe openings of the corrugated metal pipe 5 and the grouting pipe 6 are flush with the top surface of the corresponding base slab foundation 2. When the base slab foundation 2 is poured, the pipe openings of the corrugated metal pipe 5 and the grouting pipe 6 are temporarily sealed to prevent foreign matter from entering the pipes and affecting the bonding performance and effect of the grouting material later.

[0020] A groove 7 is provided at the joint between the top surface of the foundation 2 and the precast wall 1. The groove 7 has an inverted trapezoidal cross-section and a depth of 50mm. Figure 3 (b) of the groove, the bottom width of groove 7 ( Figure 3 L1 in the middle is 20mm wider on each side than the precast wall 1. Figure 3 c), the top width of groove 7 ( Figure 3 L2 in the middle is 40mm wider on each side than the precast wall 1. Figure 3 (d) The bottom surface of the precast wall 1 is located within the groove 7 and maintains a certain gap 8 between it and the top surface of the foundation 2, with a gap 8 height of 20mm. Figure 3 (a) The bottom of the precast wall 1 extends 30mm into the groove 7. Figure 3 e), the bottom edge width of precast wall 1 ( Figure 3 L3 in the middle is 25mm narrower than the outer contour edges on both sides of the precast wall 1. Figure 3 (f) In order to ensure the bonding performance between the joint between the precast wall 1 and the foundation 2 and the grouting material, the uneven joint surfaces of the foundation 2 and the precast wall 1 are treated by roughening, removing dust and applying interface agent.

[0021] After the precast wall 1 is fixed, high-strength non-shrink grout 9 is injected into the metal corrugated pipe 5, groove 7 and interval 8 through the metal grouting pipe 6. The high-strength non-shrink grout 9 has a design strength of not less than 60MPa and should have good fluidity, early strength and micro-expansion to ensure dense filling and bonding strength.

[0022] Referring to the diagram, the bottom of the precast wall 1 is provided with a first positioning component, and one side of the precast wall 1 is provided with a second positioning component, which are used for hoisting, adjusting and fixing the precast wall 1 to ensure the accurate position of the precast wall 1.

[0023] Furthermore, the first positioning component includes a high-strength bolt 10, a set of first embedded nuts 11 and a temporary angle steel support 12. The temporary angle steel support 12 is symmetrically arranged on opposite sides of the precast wall 1 and is fixed vertically and horizontally by the first embedded nuts 11 and the high-strength bolt 10 respectively.

[0024] The second positioning component includes a second embedded nut 13 and a temporary diagonal bracing steel pipe 14. The temporary diagonal bracing steel pipe 14 is diagonally braced on one side of the precast wall 1 and fixed at both ends by the second embedded nut 13.

[0025] Regarding other dimensions, the precast wall 1 has a riverside walkway 15 on the riverbank side and a levee road 16 on the land side. The elevation difference between the riverside walkway 15 and the levee road 16 is typically 1–1.5 m, meaning the retaining height of the precast wall 1 is 1–1.5 m, and the wall width is 400 mm. Figure 3 (L in the middle). The base plate foundation is 2mm thick and 600mm thick, with 4 tenons 500mm wide and 400mm deep.

[0026] The construction process includes the following steps:

[0027] Step 1: Excavate the foundation trench and construct the subbase according to the design requirements. Specifically, lay a plain concrete subbase 17 at the bottom of the foundation trench to ensure the flatness and positional accuracy of the foundation.

[0028] Step 2: When binding the reinforcing bars of the foundation 2, embed metal corrugated pipes 5 according to the position and spacing of the pre-reserved reinforcing bars 4 in the precast wall 1, and set a metal grouting pipe 6 to connect each metal corrugated pipe 5.

[0029] Step 3: Pour the foundation slab 2, making sure to fix the corrugated metal pipe 5 and the grouting pipe 6, and take temporary sealing measures on the top of them to prevent concrete or other debris from blocking the corrugated metal pipe 5 and the grouting pipe 6.

[0030] Step 4: After the cast-in-place concrete foundation 2 reaches 75% of its design strength, roughen the concave and convex surfaces of the precast wall 1 and foundation 2, remove dust, apply an interface agent, and remove the temporary seals on the top of the metal corrugated pipe 5 and the metal grouting pipe 6.

[0031] Step 5: Hoist the precast wall 1. During the hoisting process, with the help of a crane and manual labor, ensure that the reserved reinforcing bars 4 of the precast wall 1 are accurately inserted into the metal corrugated pipe 5.

[0032] Step 6: The precast wall 1 is adjusted and temporarily fixed by pre-embedded high-strength bolts 10, first embedded nuts 11, second embedded nuts 13, temporary angle steel supports 12, and temporary diagonal bracing steel pipes 14. A 20mm gap is reserved between the bottom convex surface of the precast wall 1 and the bottom surface of the groove of the base plate 2.

[0033] Step 7: Inject high-strength non-shrink grout 9 into the metal corrugated pipe 5 through the pre-embedded metal grouting pipe 6. Observe the grooves and gaps of the base plate foundation 2 during the grouting process. When the high-strength non-shrink grout 9 completely fills the grooves and gaps between each metal corrugated pipe 5, it can be regarded as the high-strength non-shrink grout 9 filling is dense.

[0034] Step 8: After the high-strength non-shrink grout 9 reaches the design strength, remove the temporary fixing measures and complete the connection between the precast wave wall and the lower cast-in-place concrete foundation.

[0035] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A connection structure between a precast wave-breaking wall and a foundation slab, used for connecting a precast wall and a foundation slab, characterized in that, The bottom of the foundation slab extends downward to form a tenon. The vertical reinforcing bars on the river-facing and retaining sides of the precast wall extend downward from the bottom of the precast wall to form reserved reinforcing bars that extend into the tenon. Before pouring the foundation slab, metal corrugated pipes are pre-embedded according to the positions of the reserved reinforcing bars. A metal grouting pipe is provided on one side of the metal corrugated pipe and is arranged obliquely upward. The metal corrugated pipe and the metal grouting pipe are interconnected. The top of the openings of the metal corrugated pipe and the metal grouting pipe are flush with the top surface of the foundation slab at the corresponding position.

2. The connection structure between the precast wave-breaking wall and the foundation slab as described in claim 1, characterized in that, The top surface of the base plate foundation is provided with a groove at the joint position with the precast wall. The bottom surface of the precast wall is located in the groove and is separated from the top surface of the base plate foundation by a certain distance. After the precast wall is fixed, high-strength non-shrink grout is injected into the metal corrugated pipe, the groove and the distance through the metal grouting pipe.

3. The connection structure between the prefabricated wave wall and the foundation slab as described in claim 1, characterized in that, The precast wall is provided with a first positioning component at its bottom and a second positioning component on one side of its side.

Images