Assembly combined type underground diaphragm wall and construction method thereof

Abstract

The invention provides an assembled and combined underground diaphragm wall and a construction method thereof, and the assembled and combined underground diaphragm wall comprises a first prefabricated reinforced concrete slab and a second prefabricated reinforced concrete slab assembled on one side of the first prefabricated reinforced concrete slab, the height of the first prefabricated reinforced concrete slab is one time that of the second prefabricated reinforced concrete slab. The underground diaphragm wall is prepared to comprise the two prefabricated reinforced concrete slabs which are assembled into a whole and are different in height, the strength needed by bearing the pressure of the soil body on the periphery of the foundation pit at different positions is guaranteed while the performance of each underground diaphragm wall is met, and compared with a cast-in-place underground diaphragm wall for preparing an equal-thickness underground diaphragm wall, the strength is greatly improved. The material loss is reduced, and the construction cost is reduced; in addition, due to the fact that all the components are prefabricated parts, the construction process is simple, and the problems that due to cast-in-place concrete, the construction process is complex, the construction period is long, the surrounding environment of a construction site is polluted and the construction cost is high are solved.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to an assembled combined underground continuous wall and a construction method thereof. Background Art

[0002] An underground continuous wall is constructed by using a grab-type or rotary trench-forming machine on the ground to dig a long and narrow deep trench along the perimeter of the excavation project with mud as the wall protection. After forming a unit trench section, a steel cage pre-made on the ground is enlarged in the trench, and then concrete is poured using the conduit method to complete a unit wall section. The unit wall sections are connected to each other by specific joints to form an underground continuous wall.

[0003] However, please refer to Figure 1 The traditional cast-in-place concrete underground continuous wall is a structure of equal thickness. When it is only used for foundation pit protection, it has disadvantages such as wasting concrete resources. In addition, since the ground-connected wall requires cast-in-place concrete, there are problems such as complex construction procedures, long construction period, pollution of the surrounding environment of the construction site, and high construction costs.

[0004] In view of the shortcomings of the cast-in-place underground continuous wall in the prior art, those skilled in the art have been looking for solutions. Summary of the invention

[0005] The object of the present invention is to provide an assembled combined underground continuous wall and a construction method thereof, so as to solve the shortcomings of the cast-in-place underground continuous wall in the prior art.

[0006] In order to solve the above technical problems, the present invention provides an assembled combined underground continuous wall, which comprises: a first precast reinforced concrete slab and a second precast reinforced concrete slab assembled on one side of the first precast reinforced concrete slab, and the height of the first precast reinforced concrete slab is twice the height of the second precast reinforced concrete slab.

[0007] Optionally, in the assembled combined underground continuous wall, the sizes of the first prefabricated reinforced concrete slab and the second prefabricated reinforced concrete slab depend on the size of the foundation pit excavation.

[0008] Optionally, in the assembled combined underground continuous wall, the height of the first prefabricated reinforced concrete slab and the height of the second prefabricated reinforced concrete slab are both at least 1 m greater than the excavation depth of the foundation pit.

[0009] Optionally, in the assembled combined underground continuous wall, the thickness of the first prefabricated reinforced concrete slab ranges from 0.3m to 0.6m, and the width ranges from 4m to 6m; the thickness of the second prefabricated reinforced concrete slab ranges from 0.3m to 0.6m, and the width ranges from 4m to 6m.

[0010] Optionally, in the assembled combined underground continuous wall, the second prefabricated reinforced concrete slab is assembled on one side of the first prefabricated reinforced concrete slab by bolts or adhesives.

[0011] The present invention also provides a construction method for assembling a combined underground continuous wall, the construction method for assembling a combined underground continuous wall comprising:

[0012] Determine the number and size of the assembled combined underground continuous walls required for the current foundation pit according to the length, width and depth of the foundation pit excavation;

[0013] On-site measurement and layout to determine the locations of trenches to be excavated on the four sides of the foundation pit;

[0014] Dig trenches in sections for each side of the foundation pit, and place assembled combined underground continuous walls corresponding to the current foundation pit in each trench until the foundation pit retaining structure is fully constructed;

[0015] The foundation pit is excavated inside the foundation pit retaining structure, and horizontal supports are set between the foundation pit retaining structures.

[0016] In the assembled combined underground continuous wall and its construction method provided by the present invention, the assembled combined underground continuous wall includes: a first precast reinforced concrete slab and a second precast reinforced concrete slab assembled on one side of the first precast reinforced concrete slab, and the height of the first precast reinforced concrete slab is twice the height of the second precast reinforced concrete slab. By preparing the underground continuous wall as two precast reinforced concrete slabs of different heights assembled in one body, while meeting the performance of each underground continuous wall, it also ensures the strength required for different positions to withstand the pressure of the soil outside the foundation pit. Compared with the use of cast-in-place underground continuous walls to prepare underground continuous walls of equal thickness, the loss of materials is reduced and the construction cost is reduced; in addition, since they are all precast parts, the construction process is simple, avoiding the problems of complex construction process, long construction period, pollution of the surrounding environment of the construction site, and high construction cost due to cast-in-place concrete. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other objects, features and advantages of the present disclosure will become more apparent through a more detailed description of exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present disclosure.

[0018] Figure 1 It is a schematic diagram of the existing traditional cast-in-place concrete underground continuous wall during construction application;

[0019] Figure 2 This is a front view of an assembled combined underground continuous wall in an embodiment of the present invention during construction application;

[0020] Figure 3 yes Figure 2 A top view of

[0021] Figure 4 It is a side view of an assembled combined underground continuous wall in one embodiment of the present invention;

[0022] Figure 5 It is a flow chart of a construction method for assembling a combined underground continuous wall in one embodiment of the present invention.

[0023] In the figure:

[0024] 1- Assembled modular underground continuous wall;

[0025] 11-First prefabricated reinforced concrete slab;

[0026] 12- Second precast reinforced concrete slab. DETAILED DESCRIPTION

[0027] The assembled combined underground continuous wall and the construction method thereof proposed by the present invention are further described in detail below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description and claims. It should be noted that the accompanying drawings are in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0028] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0029] In the description of the invention, it is necessary to understand that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0031] In the invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to the specific circumstances.

[0032] Please refer to Figures 2 to 4 The assembled combined underground continuous wall 1 includes: a first precast reinforced concrete slab 11 and a second precast reinforced concrete slab 12 assembled on one side of the first precast reinforced concrete slab 11, and the height of the first precast reinforced concrete slab 11 is twice the height of the second precast reinforced concrete slab 12.

[0033] In this embodiment, the dimensions (i.e., height, width, and thickness) of the first precast reinforced concrete slab 11 and the second precast reinforced concrete slab 12 depend on the dimensions of the foundation pit excavation (i.e., the length, width, and depth of the foundation pit), and the dimensions of the precast slabs are adjusted according to the different earth pressures on the retaining structure at different foundation pit depths (different loads result in different amounts of concrete and steel bars used in the precast slabs).

[0034] Specifically, the height of the first precast reinforced concrete slab 11 and the second precast reinforced concrete slab 12 are both at least 1m greater than the excavation depth of the foundation pit; the thickness of the first precast reinforced concrete slab 11 is in the range of 0.3m-0.6m, and the width is in the range of 4m-6m; the thickness of the second precast reinforced concrete slab 12 is in the range of 0.3m-0.6m, and the width is in the range of 4m-6m.

[0035] The assembled combined underground continuous wall of the present invention is assembled based on two prefabricated reinforced concrete slabs, and does not involve on-site pouring, which simplifies the construction process, improves the construction efficiency, and effectively speeds up the construction progress. In addition, the prefabricated reinforced concrete slabs can be mass-produced, and the use of construction machinery such as concrete pump trucks is reduced, which effectively reduces the construction cost. At the same time, the accuracy can be effectively controlled and the pollution of the surrounding environment of the construction site is reduced.

[0036] On the other hand, since an underground continuous wall is formed by assembling a high and a low prefabricated reinforced concrete slab, prefabricated reinforced concrete slabs of appropriate thickness can be selected for assembly according to the stress conditions of the underground continuous wall to meet the strength requirements. At the same time, the underground continuous wall is not of uniform thickness as a whole, which effectively reduces resource waste.

[0037] Better, such as Figure 2 and Figure 3As shown, the second precast reinforced concrete slab 12 is assembled on one side of the first precast reinforced concrete slab 11 by bolts or adhesives. It is equivalent to that the first precast reinforced concrete slab 11 and the second precast reinforced concrete slab 12 are assembled into one to form an underground continuous wall. Based on the different heights of the first precast reinforced concrete slab 11 and the second precast reinforced concrete slab 12, the overlapping part increases the thickness of the underground continuous wall to meet the required strength requirements; and the height of the first precast reinforced concrete slab 11 meets the height requirements of the underground continuous wall. That is, while meeting the performance of each underground continuous wall, it also ensures the strength required to withstand the pressure of the soil outside the foundation pit at different positions. Compared with the use of cast-in-place underground continuous walls to prepare underground continuous walls of equal thickness, the loss of materials is reduced and the construction cost is reduced; in addition, since they are all precast parts, the construction process is simple, avoiding the problems of complex construction process, long construction period, pollution of the surrounding environment of the construction site, and high construction cost due to cast-in-place concrete.

[0038] Accordingly, this embodiment also provides a construction method for assembling a combined underground continuous wall. Figures 2 to 5 The construction method of the assembled combined underground continuous wall described in this embodiment is described in detail.

[0039] First, executing step S1, determining the number and size of the assembled combined underground continuous walls required for preparing the current foundation pit according to the length, width and depth of the foundation pit excavation;

[0040] Next, step S2 is performed to measure and lay out on site to determine the locations of trenches to be excavated on the four sides of the foundation pit;

[0041] Next, step S3 is executed to excavate trenches in sections for each side of the foundation pit, and to hang and place the assembled combined underground continuous wall corresponding to the current foundation pit in each section of the trench until the construction of the foundation pit retaining structure is completed;

[0042] Next, step S4 is executed to excavate the foundation pit inside the foundation pit retaining structure, and at the same time, horizontal supports are set between the foundation pit retaining structures.

[0043] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0044] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0045] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. An assembled underground continuous wall, characterized in that: include: A first precast reinforced concrete slab and a second precast reinforced concrete slab assembled on one side of the first precast reinforced concrete slab, wherein the height of the first precast reinforced concrete slab is twice the height of the second precast reinforced concrete slab.

2. The assembled underground continuous wall according to claim 1, characterized in that: The sizes of the first precast reinforced concrete slab and the second precast reinforced concrete slab depend on the size of the foundation pit excavation.

3. The assembled underground continuous wall according to claim 2, characterized in that: The heights of the first prefabricated reinforced concrete slab and the second prefabricated reinforced concrete slab are both at least 1 m greater than the excavation depth of the foundation pit.

4. The assembled underground continuous wall according to claim 2, characterized in that: The thickness of the first prefabricated reinforced concrete slab is in the range of 0.3m-0.6m, and the width is in the range of 4m-6m; the thickness of the second prefabricated reinforced concrete slab is in the range of 0.3m-0.6m, and the width is in the range of 4m-6m.

5. The assembled underground continuous wall according to claim 1, characterized in that: The second prefabricated reinforced concrete slab is assembled on one side of the first prefabricated reinforced concrete slab by bolts or adhesives.

6. A construction method for assembling a combined underground continuous wall, characterized in that: include: Determine the number and size of the assembled underground continuous walls as described in any one of claims 1 to 5 required for preparing the current foundation pit according to the length, width and depth of the foundation pit excavation; On-site measurement and layout to determine the locations of trenches to be excavated on the four sides of the foundation pit; Dig trenches in sections for each side of the foundation pit, and place assembled combined underground continuous walls corresponding to the current foundation pit in each trench until the foundation pit retaining structure is fully constructed; The foundation pit is excavated inside the foundation pit retaining structure, and horizontal supports are set between the foundation pit retaining structures.

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