Temporary support changing structure for inner support at post-cast strip position of deep foundation pit

Abstract

The utility model provides a deep foundation pit post-cast strip position inner support temporary support changing structure which comprises a blocking backfill material placed in a post-cast strip, a throwing rib is embedded in the blocking backfill material, a cover plate is arranged above the blocking backfill material and used for tightly covering the post-cast strip, a temporary force transmission plate strip is arranged above the cover plate, and the temporary force transmission plate strip is connected with the throwing rib. One side of the temporary force transmission plate strip is attached to the temporary force transmission retaining wall body, the other side of the temporary force transmission plate strip is attached to the supporting pile baffle, the supporting pile baffle is used for isolating concrete from being bonded with the steel sheet piles when the temporary force transmission plate strip is poured, and the temporary force transmission retaining wall body is higher than the top of the temporary force transmission plate strip. According to the temporary support changing structure for the inner support at the post-cast strip position of the deep foundation pit, the structure and the structural foundation slab are formed in a one-time pouring mode in a reinforced concrete mode, the corresponding reinforcing bars are connected with the foundation slab to be used for transmitting water and soil pressure behind supporting piles, the functionality of the post-cast strip position can be protected against influences, and the service life of the post-cast strip position is prolonged. Compared with a traditional supporting plate strip replacing mode, the supporting plate strip replacing mode has the similar force transmission effect, and the safety, construction convenience and practicability are all met.

Description

Technical Field

[0001] This utility model belongs to the field of construction of internal support dismantling and support in building foundation pits, and in particular relates to a temporary support replacement structure for internal support at the post-pouring strip position of deep foundation pits. Background Technology

[0002] For sites with deep foundation pits and poor soil mechanical properties, a combination of retaining piles and internal bracing is often required during deep foundation pit excavation. In most foundation pit projects, to avoid hindering the construction of the main basement exterior walls, the internal bracing must be removed before the basement exterior walls are constructed. For some projects with tight schedules, a portion of the building's foundation may be constructed first, leaving a settlement or deformation-prone post-cast strip connected to the overall project. In such cases, the foundation pit retaining piles need to be arranged along the outer ring of the post-cast strip. If conventional replacement bracing is used, connecting the replacement bracing strip to the foundation slab for support removal, the concrete of the replacement bracing strip will completely fill the post-cast strip area, destroying its functionality. For this situation, steel pipe inclined bracing or bracing strips pushed to the basement exterior walls can generally be used. However, steel pipe inclined bracing is complex to construct, requiring penetration through the basement exterior walls, involving issues such as external wall reinforcement and waterproofing, resulting in higher costs and construction difficulties. This method is not feasible for buildings using glass curtain walls or similar materials as basement exterior walls. For buildings that sometimes lack concrete basement exterior walls, the method of attaching the replacement strut to the basement exterior wall is not feasible. Therefore, this invention proposes an internal support replacement structure for locations with post-cast strips and no basement exterior walls. Utility Model Content

[0003] In view of this, the present invention aims to propose a temporary replacement support structure for the internal support of the post-pouring strip in deep foundation pits, so as to solve the problems of difficult construction or high cost when replacing the internal support of the post-pouring strip.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0005] A temporary support structure for the post-cast strip in a deep foundation pit includes sealing backfill material placed inside the post-cast strip, with reinforcing bars embedded within the sealing backfill material. A cover plate is provided above the sealing backfill material to tightly cover the post-cast strip location. A temporary force transmission plate is provided above the cover plate. One side of the temporary force transmission plate is attached to the main body of a temporary force transmission retaining wall, and the other side is attached to a retaining pile baffle. The retaining pile baffle is used to prevent the concrete from bonding with the steel sheet piles during the pouring of the temporary force transmission plate. The height of the main body of the temporary force transmission retaining wall is higher than the top of the temporary force transmission plate.

[0006] Furthermore, the main body of the temporary force-transfer retaining wall is constructed simultaneously with the binding of the foundation slab reinforcement, by anchoring the main reinforcement into the foundation slab and pouring it at the same time.

[0007] Furthermore, the temporary force-transfer plate is arranged along the entire length of the post-cast strip to form a uniformly distributed effective force-transfer concrete slab.

[0008] Furthermore, the temporary force transmission plate and the main body of the temporary force transmission retaining wall are poured simultaneously.

[0009] Furthermore, the temporary force transmission plate belt is constructed using wooden formwork for support and casting.

[0010] Furthermore, the cover plate is a wooden cover plate.

[0011] Furthermore, the surface of the rib is covered with a rust inhibitor or a rust-preventive coating.

[0012] Furthermore, the sealing and backfilling material is made of high-quality clay.

[0013] Furthermore, the retaining pile baffle is a wooden baffle.

[0014] Compared with the prior art, the temporary support replacement structure for the deep foundation pit post-cast strip location described in this utility model has the following advantages:

[0015] (1) The temporary replacement support structure for the deep foundation pit post-pouring strip location described in this utility model is formed by casting reinforced concrete and the foundation slab at one time. It is connected to the foundation slab with corresponding reinforcement to transfer the water and soil pressure after the support pile. It can also protect the functionality of the post-pouring strip location from being affected. There is no need to forcefully remove the post-pouring strip later. Compared with the traditional replacement support plate strip, it has a similar force transmission effect. Safety, construction convenience and practicality are all satisfied.

[0016] (2) The temporary replacement support structure for the deep foundation pit post-pouring strip position described in this utility model has the advantages of wide applicability, convenient construction and good force transmission effect. Attached Figure Description

[0017] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0018] Figure 1 This is a schematic diagram of the temporary support structure within the post-cast strip of the deep foundation pit as described in this embodiment of the utility model;

[0019] Figure 2 This is a schematic diagram of the main body of the temporary force-transmitting retaining wall according to an embodiment of the present utility model.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1-Temporary force-transfer retaining wall main body; 2-Temporary force-transfer plate strip; 3-Cover plate; 4-Reinforcing bar; 5-Sealing backfill material; 6-Support pile retaining plate. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0023] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, 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, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] A temporary support replacement structure for the internal support at the post-cast strip location of a deep foundation pit, such as... Figure 1 and Figure 2As shown, the structure includes a temporary force-transfer retaining wall body 1, a temporary force-transfer strip 2, a cover plate 3, reinforcing bars 4, sealing backfill material 5, and a retaining pile baffle 6. The sealing backfill material 5 is placed within the post-cast strip, and reinforcing bars 4 are embedded within it. A cover plate 3 is positioned above the sealing backfill material 5 to tightly cover the post-cast strip area. The temporary force-transfer strip 2 is positioned above the cover plate 3. One side of the temporary force-transfer strip 2 is attached to the temporary force-transfer retaining wall body 1, and the other side is attached to the retaining pile baffle 6. The retaining pile baffle 6 is used to prevent the concrete from bonding with the sheet piles during the pouring of the temporary force-transfer strip 2. The height of the temporary force-transfer retaining wall body 1 must exceed the top of the temporary force-transfer strip 2 to prevent shear failure at the strip joint.

[0027] The main body of the temporary force-transfer retaining wall 1 is constructed simultaneously with the binding of the foundation slab reinforcement, by anchoring the main reinforcement into the foundation slab and pouring it at the same time.

[0028] Temporary force transfer plate 2 is arranged along the entire length of the post-cast strip to form a uniformly distributed effective force transfer concrete slab.

[0029] The temporary force transmission plate 2 can be cast together with the main body of the temporary force transmission retaining wall 1, or it can be cast separately using wooden formwork. However, it is necessary to ensure that the main body of the temporary force transmission retaining wall 1 and the temporary force transmission plate 2 are tightly fitted together and that no gaps are formed, so as to avoid leaving a deformation buffer area.

[0030] Cover plate 3 is a wooden cover plate for the post-pouring strip. The purpose of cover plate 3 is to separate the concrete of the upper temporary force transfer strip 2 from the reinforcing bars 4 in the post-pouring strip, so as to avoid the complex and difficult construction process of later chiseling when the concrete is poured as a whole.

[0031] The reinforcing bars (4) require rust prevention treatment, which can be achieved by covering the surface with a rust inhibitor or rust-preventive coating. This forms a protective film on the surface of the reinforcing bars to prevent corrosion and aging of the reinforcing bars within the post-cast strip, allowing for future reuse.

[0032] The purpose of rust prevention treatment for the reinforcing bar 4 is to ensure that the joint of the reinforcing bar 4 is embedded in the backfill material 5 when the backfill material 5 is used to seal the post-pouring strip. After the support steel sheet piles are removed, groundwater will enter the backfill material 5 of the post-pouring strip, which may cause the reinforcing bar 4 to rust. Therefore, corresponding treatment measures need to be taken.

[0033] For sealing and backfilling material 5, high-quality clay can generally be used, ensuring a certain compaction coefficient while also considering waterproofing and load transfer. High-permeability sandy soil and materials that are difficult to excavate later, such as gravel or concrete blocks, should not be used.

[0034] The retaining pile baffle 6 is a wooden baffle used to prevent the concrete from bonding with the steel sheet piles during the pouring of the temporary force transfer strip 2. Since the steel sheet piles are reusable materials, if the concrete bonds with them, it will lead to difficulties in later pile extraction.

[0035] Examples, as shown in the appendix Figure 1 and 2 As shown, a temporary support structure for the post-cast strip in a deep foundation pit includes a temporary force-transfer retaining wall body 1 and a temporary force-transfer strip 2, both cast in place on-site using molds. For a typical single-story underground foundation pit, the thickness of the temporary force-transfer retaining wall body 1 can be 400mm, and the thickness of the temporary force-transfer strip 2 can be 300mm. The height of the temporary force-transfer retaining wall body 1 must exceed the top of the temporary force-transfer strip 2 to prevent shear failure at the strip joint. The cover plate 3 can be made of 10mm thick wooden formwork. This structure serves to cover the post-cast strip area and must be tightly sealed to prevent concrete from flowing into the post-cast strip during on-site pouring of the temporary force-transfer strip 2, which would affect the later use of this location.

[0036] The reinforcing bars 4 can be coated with a rust inhibitor or rust-preventive coating. This forms a protective film on the surface of the reinforcing bars to prevent corrosion and aging within the post-cast strip, allowing for later reuse. The backfill material 5 should meet the relevant design specifications to ensure the strength and stability of the fill material. Generally, silt and silty soil, expansive soil, soil with an organic matter content greater than 8%, soil with a water-soluble sulfate content greater than 5%, and cohesive soil with a moisture content that does not meet compaction requirements should not be used. The retaining wall 6 can be made of wood blocks with sufficient strength, with a thickness of 50-100mm. Its resistance to deformation must meet the requirements of the retaining pile deformation when the internal support is removed to prevent excessive compression deformation of the wooden retaining wall during dismantling, which could lead to continuous overturning and prevent the retaining pile from overturning, rendering the replacement retaining wall ineffective. The retaining pile baffle 6 also facilitates the later removal of recyclable retaining steel sheet piles. If the temporary force transmission plate 2 is directly connected to the retaining steel sheet pile, the concrete material will form a tight connection with the retaining pile, which may make it difficult to remove the retaining pile and result in a large waste of costs.

[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A deep foundation pit post-cast strip position inner support temporary support replacement structure, characterized in that: The blocking backfill material is embedded in the post-cast strip, the blocking backfill material is embedded with the sling rib, a cover plate is arranged above the blocking backfill material, the cover plate is used for tightly covering the post-cast strip position, a temporary force transmission plate strip is arranged above the cover plate, one side of the temporary force transmission plate strip is attached to the temporary force transmission retaining wall body, and the other side is attached to a support pile baffle, the support pile baffle is used for isolating the concrete and the steel sheet pile bonding during pouring of the temporary force transmission plate strip, and the height of the temporary force transmission retaining wall body is higher than the top of the temporary force transmission plate strip.

2. The temporary support structure for deep foundation post-cast strip position inner support according to claim 1, wherein: The temporary force transmission retaining wall body is formed by simultaneously anchoring the main steel bars into the foundation bottom plate and pouring during the steel bar binding of the foundation bottom plate.

3. The temporary support structure for deep foundation post-cast strip position inner support according to claim 1, characterized in that: The temporary force transmission plate strip is arranged along the post-cast strip and forms a uniformly distributed effective force transmission concrete flat plate.

4. The temporary support structure for deep foundation post-cast strip position inner support according to claim 1, characterized in that: The temporary force transmission plate strip is poured simultaneously with the temporary force transmission retaining wall body.

5. The temporary support structure for deep foundation post-cast strip position inner support according to claim 1, characterized in that: The temporary force transmission plate strip is separately poured by using a wooden formwork.

6. The temporary support structure for deep foundation post-cast strip position inner support according to claim 1, characterized in that: The cover plate is a wooden cover plate.

7. The temporary support structure for deep foundation post-cast strip position inner support according to claim 1, characterized in that: The surface of the sling rib is covered with a rust inhibitor or a rust-proof coating.

8. The temporary support structure for deep foundation post-cast strip position inner support according to claim 1, characterized in that: The blocking backfill material is made of high-quality clay.

9. The temporary support structure for deep foundation post-cast strip position inner support according to claim 1, characterized in that: The support pile baffle is a wooden baffle.

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