Foundation pit supporting support with permanent structure

Abstract

The utility model relates to the field of foundation pit supporting and supporting, and discloses a foundation pit supporting and supporting device utilizing a permanent structure, which is applied to foundation pit supporting and is characterized in that the permanent structure is mounted in a foundation pit and comprises a plurality of reinforced concrete thick plates arranged at intervals; each reinforced concrete thick plate is connected with a temporary vertical supporting structure, the temporary vertical supporting structures are used for supporting the reinforced concrete thick plates, the thickness of the reinforced concrete thick plates is 300-500 mm, and the floor system form of the reinforced concrete thick plates is a frame beam large plate structure or a flat slab structure. By means of the permanent and adjacent combined mode that the permanent structure is also used as the foundation pit support, the purposes that an inner support of the foundation pit support is omitted, and the support does not need to be disassembled or replaced are achieved, and the construction convenience and the foundation pit support safety can be effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of foundation pit support and support, especially utilizes permanent structure as foundation pit support and support. BACKGROUND

[0002] In the foundation pit support construction, the inner support and the angle support are the common structure forms, mainly exerting the reverse support force to the soil body around the foundation pit in the excavation process to prevent the soil body instability or the foundation pit deformation, however, most of these support structures are temporary structures, and the following problems exist:

[0003] Firstly, due to the temporary construction points of the inner support and the angle support, they need to be set gradually in stages along with the foundation pit excavation, and are dismantled and replaced many times according to the construction progress in the construction process, and each time of dismantling and replacing needs to be carried out under the condition of ensuring the stability of the structure, which leads to extremely complicated construction work and increases the construction period.

[0004] Secondly, the dismantling and replacing process is prone to safety hazards. Since the structure is dismantled and replaced, the stress state of the foundation pit structure will change, the stability of the support system may appear temporary failure, and the risk of foundation pit deformation or collapse is greatly increased. Especially in the case of deep foundation pit or complex geological conditions, this risk is more prominent. If the operation is improper or effective support measures are not taken in time, foundation pit accidents are easily caused.

[0005] Thirdly, the dismantling and replacing work not only affects the construction progress, but also leads to the increase of construction cost. A large amount of manpower and materials need to be invested to complete the setting and construction of the support in the construction process, which causes the increase and waste of construction cost.

[0006] Therefore, although the traditional inner support and angle support method can play a certain supporting role, there are safety hazards and low efficiency problems in the process of dismantling and replacing, which is one of the important reasons for the current foundation pit support technology to be improved and optimized. CONTENT OF THE UTILITY MODEL

[0007] The utility model aims at providing a permanent structure as foundation pit support and support to solve the problem that the stress state of the foundation pit structure changes, the stability of the support system may appear temporary failure, and the risk of foundation pit deformation or collapse is greatly increased due to the dismantling and replacing, and the specific technical scheme is as follows:

[0008] The utility model provides a kind of permanent structure as foundation pit support support, it is applied to foundation pit support, the permanent structure is installed in the foundation pit, the permanent structure includes several interval steel reinforced concrete thick plates, each steel reinforced concrete thick plate is connected with temporary vertical support structure, the temporary vertical support structure is used to support the steel reinforced concrete thick plate, the thickness of the steel reinforced concrete thick plate is 300-500mm, the floor form of the steel reinforced concrete thick plate is frame beam large plate structure or beamless floor structure.

[0009] As one of the improvements of the above technical solutions, temporary vertical support structures are arranged on both sides of the steel reinforced concrete thick plate in the width direction.

[0010] As one of the improvements of the above technical solutions, at least one temporary vertical support structure is arranged every 10-15m along the span direction of the steel reinforced concrete thick plate.

[0011] As one of the improvements of the above technical solutions, the temporary vertical support is a lattice steel column or a steel pipe column.

[0012] As one of the improvements of the above technical solutions, steel bars extending outward are reserved on the side surface of the steel reinforced concrete thick plate.

[0013] As one of the improvements of the above technical solutions, the interval between two adjacent steel reinforced concrete thick plates is 20-30m, and the width of the steel reinforced concrete thick plate is 4-8m.

[0014] As one of the improvements of the above technical solutions, a reserved hole is arranged on the steel reinforced concrete thick plate to accommodate a frame column in the foundation pit, and the side length or diameter of the reserved hole is 700-800mm larger than that of the frame column.

[0015] The utility model has the advantages that: by using the permanent structure as foundation pit support support, the permanent structure is installed in the foundation pit, the permanent structure includes several interval steel reinforced concrete thick plates, each steel reinforced concrete thick plate is connected with temporary vertical support structure, the temporary vertical support structure is used to support the steel reinforced concrete thick plate, the thickness of the steel reinforced concrete thick plate is 300-500mm, the floor form of the steel reinforced concrete thick plate is frame beam large plate structure or beamless floor structure.

[0016] The additional aspects and advantages of the utility model will be partially given in the following description, partially will become obvious from the following description, or be understood by the practice of the utility model, of course, any product or method of the present application does not necessarily need to achieve all the advantages described above. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0018] Fig. 1 is a structural schematic diagram of the present application.

[0019] Fig. 2 is a structural schematic diagram of the temporary vertical support structure of the present application.

[0020] Fig. 3 is a structural schematic diagram of the reinforced concrete thick plate of the present application.

[0021] In the figure: 1, foundation pit; 2, reinforced concrete thick plate; 3, temporary vertical support structure; 4, reserved steel bar. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments only constitute some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0023] In view of the problems of complicated and dangerous disassembly and replacement in the existing foundation pit support method, the present application proposes a method of using a permanent structure as a foundation pit 1 support to improve construction efficiency and support safety. Please refer to Figs. 1-3 In the embodiments of the present application, a permanent structure is used as a foundation pit support, applied to a foundation pit 1 support, and the permanent structure is installed in the foundation pit 1. The permanent structure includes a plurality of spaced reinforced concrete thick plates 2, each of which is connected with a temporary vertical support structure 3. The temporary vertical support structure 3 is used to support the reinforced concrete thick plate 2. The thickness of the reinforced concrete thick plate 2 is 300-500 mm, and the floor form of the reinforced concrete thick plate 2 is a frame beam slab structure or a beamless floor structure.

[0024] The permanent structure usually adopts a reinforced concrete thick plate 2 structure form, which has the main advantages of large rigidity and convenient construction. The reinforced concrete thick plate 2 has excellent bending stiffness and bearing capacity. In order to meet different engineering requirements, the floor structure of the reinforced concrete thick plate 2 can adopt one of the following two forms:

[0025] Frame beam large plate structure: through the beam and the plate to form a whole stress frame, can effectively disperse load and support force, structural stiffness, suitable for larger span foundation pit 1 support.

[0026] Beam-free floor structure: using directly supported floor structure, through the plate thickness to enhance the plate stiffness, has the advantages of uniform stress, simple structure, suitable for flexible space layout engineering projects.

[0027] After completion, the permanent structure will continue to play a role as part of the building main body, this design makes the support structure and the permanent building structure effectively combined, avoiding the drawbacks of traditional support need to be removed, replaced support.

[0028] By taking the permanent structure as the foundation pit 1 support, the operation of removing and replacing the support in the traditional foundation pit 1 support system is avoided. The permanent structure support part can be constructed after the foundation pit 1 is excavated to the corresponding elevation, and directly plays a supporting role, effectively improving the construction efficiency. Since the permanent structure support part has bearing capacity after construction is completed, and does not need to be removed and replaced, the risk of foundation pit 1 instability during the process of removing and replacing the support in the traditional temporary support system is avoided.

[0029] Temporary vertical support structure 3 in the form of lattice steel column or steel pipe column, etc. Its stiffness and construction strength can be designed and optimized according to the actual project, thereby significantly improving the overall stability and safety of the support system

[0030] In some embodiments, temporary vertical support structures 3 are connected on both sides of the width direction of the reinforced concrete thick plate 2. It can be understood that the span of the permanent structure is usually large, and in order to facilitate construction, the permanent structure column position is avoided, and the cross section is too large to resist vertical deformation, so it is necessary to set temporary vertical support structures 3 at the structure support. Vertical supports can be set at least one temporary vertical support structure 3 every 10-15m along the span direction of the reinforced concrete thick plate 2 according to the span size. In addition, temporary vertical support structures 3 can also be set near the edges on both sides along the width direction of the permanent structure support to avoid overturning or twisting of the permanent structure support. Temporary vertical support structures 3 can be in the form of lattice steel column or steel pipe column, etc. The cross section can be determined as needed. Generally, temporary vertical support structures 3 are lattice steel columns or steel pipe columns.

[0031] The support part of the permanent structure is constructed first after the excavation to the layer to serve as the support of the foundation pit 1, and the remaining permanent structure needs to be connected with the original support part after the basement structure is constructed from the bottom plate to the layer. Therefore, when the support part of the permanent structure is constructed, the reserved steel bars 4 extending outward are reserved on the side surface to connect with the steel bars of the remaining permanent structure constructed later, and finally the concrete of the remaining permanent structure part is poured to connect the support part of the permanent structure into a complete basement permanent structure.

[0032] Preferably, the width of the reinforced concrete thick plate 2 is determined according to the internal force of the foundation pit 1 supporting the support, the interval of the support, the thickness of the support plate and other parameters, for example, the interval between two adjacent reinforced concrete thick plates 2 is 20-30 m, and the width of the reinforced concrete thick plate 2 is 4-8 m.

[0033] The selection of the support position of the permanent structure avoids the column position of the main structure as much as possible, so that the construction of the column position and the lower foundation is not affected, and the excavation can be performed to the bottom of the foundation pit 1 and then the construction is performed. For a small number of frame columns that cannot be avoided, a hole can be left at the structural support, specifically, the permanent structure, that is, the reinforced concrete thick plate 2 is provided with a reserved hole for accommodating the frame column in the foundation pit 1, the side length or diameter of the reserved hole is 700-800 mm larger than that of the frame column, the weakened position of the structural support can be reinforced by increasing the support width or adding a haunch, which can ensure the safety of the structure and improve the flexibility of the design and construction.

[0034] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

Claims

1. A method for using permanent structures as support for foundation pits, characterized in that, The permanent structure is installed in the foundation pit. The permanent structure includes several spaced reinforced concrete slabs. Each reinforced concrete slab is connected to a temporary vertical support structure, which is used to support the reinforced concrete slab. The thickness of the reinforced concrete slab is 300-500mm. The floor form of the reinforced concrete slab is a frame beam slab structure or a flat slab structure.

2. The method of using a permanent structure as a foundation pit support according to claim 1, characterized in that: Temporary vertical support structures are provided on both sides of the width direction of the reinforced concrete thick slab.

3. The method of using a permanent structure as a support for a foundation pit according to claim 1, characterized in that: Along the span direction of the reinforced concrete slab, at least one temporary vertical support structure is provided every 10-15m.

4. The method of using a permanent structure as a foundation pit support according to claim 2, characterized in that: The temporary vertical support is a lattice steel column or a steel pipe column.

5. The method of using a permanent structure as a foundation pit support according to claim 1, characterized in that: The reinforced concrete slab has outwardly extending reinforcing bars pre-installed on its side.

6. The method of using a permanent structure as a foundation pit support according to claim 5, characterized in that: The interval between two adjacent reinforced concrete slabs is 20-30m, and the width of the reinforced concrete slab is 4-8m.

7. The method of using a permanent structure as a foundation pit support according to claim 1, characterized in that: The reinforced concrete slab has a reserved hole for accommodating the frame column in the foundation pit. The side length or diameter of the reserved hole is 700-800 mm larger than the side length or diameter of the frame column.

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