Foundation pit partition wall replacement support structure and foundation pit partition wall removal replacement support construction method

Abstract

The present invention discloses a foundation pit partition wall replacement support structure and a replacement support construction method for dismantling a foundation pit partition wall. The structure is arranged between two structural columns, between two structural beams, or between a structural column and a structural beam, and includes an H-shaped steel, and a first support and / or a second support; the first support is connected to the corresponding structural column through a steel anchor plate; the second support is a steel corbel structure; the distance between each first support and the foundation pit partition wall is within half of the span of the corresponding structural column. During construction, the foundation pit partition wall and the basement structure are constructed first, and the second support is set; when the demolition conditions are met, the foundation pit partition wall is dismantled from top to bottom; the structure is dismantled to the top surface of each structural beam that needs to be replaced, and the corresponding first support and H-shaped steel are set; finally, the post-cast strip is cast, and when the requirements are met, the H-shaped steel is removed and recycled. The implementation of the present invention does not require large or special equipment; the formed structure has clear force transmission, strong operability, fast implementation speed, economical material use, and can be recycled.

Description

Technical Field

[0001] The present invention relates to the technical field, and in particular to a foundation pit partition wall support replacement structure and a support replacement construction method for dismantling a foundation pit partition wall. Background Art

[0002] Due to requirements such as development sequence, environmental protection, functional realization or land ownership, the construction of large underground spaces is often required to be carried out in blocks and phases, so partition wall structures will appear in the foundation pit.

[0003] In the prior art, the foundation pit of the wall support system is constructed in an open-cut construction sequence, usually by constructing the basement structure layer by layer from bottom to top, and then dismantling the supporting structure layer by layer from bottom to top, and finally forming a partition wall as a force transmission structure to connect the basement structures on both sides.

[0004] During the demolition of the partition wall, each structural layer above the bottom plate that is affected by the external soil pressure must be replaced to ensure that the basement structure on both sides of the partition wall can effectively transmit and balance the external soil pressure.

[0005] This leads to the fact that foundation pit partition walls usually adopt reinforced concrete underground continuous walls or cast-in-place pile rows. Although the method of pre-embedding steel-bracing connectors in the continuous wall has certain feasibility, this method has high requirements on the positioning accuracy of the continuous wall, and the construction quality is difficult to guarantee. In addition, the construction method of pre-embedding steel-bracing connectors in the cast-in-place pile row is limited by the discontinuity of the pile row and the positioning accuracy problem, so this method is difficult to implement.

[0006] Therefore, how to solve the defects of the prior art that the replacement support components need to be embedded in the foundation pit partition wall and large or special equipment is needed for implementation has become a technical problem that technicians in this field urgently need to solve. Summary of the Invention

[0007] In view of the above-mentioned defects of the prior art, the present invention provides a foundation pit partition wall replacement support structure and a replacement support construction method for dismantling the foundation pit partition wall. The purpose is to achieve the following: there is no need to pre-embed replacement support components in the foundation pit partition wall, and no large or special equipment is required during implementation; the formed structure has clear force transmission; the construction technology is mature, the operability is strong, and the implementation speed is fast; the materials are economical and can be recycled, and the project investment is low.

[0008] To achieve the above-mentioned object, the present invention discloses a foundation pit partition wall support replacement structure, which is arranged between two structural columns, between two structural beam plates, or between one structural column and one structural beam plate of a basement structure on both sides of the foundation pit partition wall, and includes a first support provided on the structural column and / or a second support provided on the structural beam plate;

[0009] H-shaped steel for transmitting horizontal force is provided between the two first supports of two structural columns, between the two second supports of two structural beam plates, or between one first support and one second support between one structural column and one structural beam plate;

[0010] The first support is connected to the corresponding structural column through a steel anchor plate;

[0011] The second support is a steel corbel structure, comprising a corbel bottom plate and a corbel end plate at an angle of 90 degrees ± 5%;

[0012] One side of each of the corbel bottom plates is pre-embedded and cast in the structural beam plate;

[0013] Each of the corbel end plates is fixedly connected to the H-shaped steel;

[0014] The distance between each of the first supports and the foundation pit partition wall is within half of the corresponding span of the structural column.

[0015] Preferably, the first support comprises the steel anchor plate, and a plurality of column-connected steel bars connected by perforation plug welding on one side of the steel anchor plate;

[0016] The other side of the steel anchor plate is fixed to one end of the H-shaped steel by welding;

[0017] The sizes of the plurality of column connecting steel bars match the sizes of the corresponding structural columns to meet the requirements of the anchoring structure;

[0018] The side length of the steel anchor plate is less than or equal to the outer contour of the structural column;

[0019] The steel anchor plate is anchored at the middle position of the side surface of the structural column through a plurality of column connecting steel bars.

[0020] More preferably, a plurality of the column connecting steel bars are arranged in a rectangular array or a circular array on a side where the steel anchor plate is in contact with the structural column.

[0021] Preferably, two or more ribs are provided between the corbel bottom plate and the corbel end plate;

[0022] Each of the ribs is perpendicular to the corbel bottom plate and the corbel end plate.

[0023] Preferably, one side of the corbel bottom plate pre-embedded and cast in the structural beam plate is provided with shear-resistant steel;

[0024] The shear-resistant steel is pre-embedded and cast in the structural beam plate, and is embedded in the center of the structural main beam of the structural beam plate.

[0025] More preferably, the shear-resistant steel is a channel steel or an I-beam, and the embedded length meets the shear resistance requirements.

[0026] The present invention also provides a support replacement construction method for removing a foundation pit partition wall using a foundation pit partition wall support replacement structure, comprising the following steps:

[0027] Step 1: Construct the basement structure on both sides of the foundation pit partition wall in stages from bottom to top. At the location of the structural beam slab where the second support is required, pre-embed one side of the corresponding corbel bottom plate in the structural beam slab;

[0028] Step 2: Waiting. When the various structural layers above the basement structure floor that are affected by the external soil pressure are cast and tightly connected to the foundation pit partition wall, the conditions for removing the foundation pit partition wall are met, and the foundation pit partition wall is removed from top to bottom.

[0029] Step 3: Remove the foundation pit partition wall to the top surface of the structural beam slab that needs to be replaced, and install the corresponding steel anchor plate in the middle of the side of the corresponding structural column where the first support is required;

[0030] Step 4: Complete the connection between the H-shaped steel and the corresponding first support or the corresponding second support;

[0031] Step 5: Repeat steps 3 to 4 until the replacement support structures of each structural layer above the bottom plate of the basement structure affected by the external soil pressure are completed, and the foundation pit partition wall is removed to below the bottom plate;

[0032] Step 6: pour and seal the post-cast strip formed by removing the foundation pit partition wall. When the concrete reaches the designed strength, remove and recycle the H-shaped steel.

[0033] Preferably, in step 4, fine stone concrete is poured into the gap between the H-shaped steel bars.

[0034] Beneficial effects of the present invention:

[0035] 1. The support replacement structure formed by the present invention utilizes the components of the basement structure on both sides of the partition wall as force transmission supports, which has clear force transmission and reliable technology, and can effectively connect the basement structures on both sides of the partition wall and transmit horizontal force.

[0036] 2. The present invention features mature construction technology and is easy to operate. Construction can be performed layer by layer, following the order in which the partition walls are dismantled from top to bottom, resulting in a clear construction process. The force-transmitting supports of the replacement structure are adjusted in form and position based on the layout of the basement's beam, slab, and column components, offering high operational flexibility.

[0037] 3. The replacement support structure formed by the present invention can realize the recycling of the steel components of the replacement support structure after the post-cast strip formed by the demolition of the partition wall is cast and sealed, so this construction method has good economic efficiency.

[0038] 4. The present invention is highly applicable to both reinforced concrete ground-connected walls and foundation pit partition walls formed by rows of cast-in-place piles. This method for constructing a dismantling and replacement support structure eliminates the need for pre-embedded replacement support components within the partition wall and does not require large or specialized equipment. This avoids the difficulties associated with pre-embedded replacement support components within the partition wall and provides an efficient method for replacing support components during the removal of foundation pit partition walls.

[0039] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic structural diagram showing a steel anchor plate provided with a column connecting steel bar on one side in one embodiment of the present invention.

[0041] Figure 2 A schematic structural diagram showing the connection between the first support and the structural column in one embodiment of the present invention is shown.

[0042] Figure 3 A schematic structural diagram showing a side view of a structural column provided with a first support in one embodiment of the present invention.

[0043] Figure 4 A side structural schematic diagram showing the connection relationship between the second support and the structural beam plate in one embodiment of the present invention.

[0044] Figure 5 A schematic diagram of the end structure showing the connection relationship between the second support and the structural beam plate in one embodiment of the present invention.

[0045] Figure 6 A schematic structural diagram of constructing a foundation pit partition wall and setting a first support in one embodiment of the present invention is shown.

[0046] Figure 7 A schematic structural diagram showing the completion of setting the first H-beam in one embodiment of the present invention is shown.

[0047] Figure 8 A schematic structural diagram showing the arrangement of the second H-shaped steel in one embodiment of the present invention is shown.

[0048] Figure 9 A schematic diagram of the structure in which all H-shaped steels are recovered after construction is completed in one embodiment of the present invention is shown. DETAILED DESCRIPTION

[0049] Example

[0050] like Figures 1 to 5 As shown, the foundation pit partition wall replacement support structure is arranged between two structural columns 1, between two structural beam plates 3, or between one structural column 1 and one structural beam plate 3 of the basement structure on both sides of the foundation pit partition wall 2, and includes a first support 4 arranged on the structural column 1 and / or a second support 5 arranged on the structural beam plate 3;

[0051] H-shaped steel 6 for transmitting horizontal force is provided between the two first supports 4 of two structural columns 1, between the two second supports 5 of two structural beam plates 3, or between a first support 4 and a second support 5 between a structural column 1 and a structural beam plate 3;

[0052] The first support 4 is connected to the corresponding structural column 1 through a steel anchor plate 7;

[0053] The second support 5 is a steel corbel structure, comprising a corbel bottom plate 8 and a corbel end plate 9 at an angle of 90 degrees ± 5%;

[0054] One side of each corbel bottom plate 8 is pre-embedded and cast in the structural beam plate 3;

[0055] Each corbel end plate 9 is fixedly connected to the H-shaped steel 6;

[0056] The distance between each first support 4 and the foundation pit partition wall 2 is within half of the corresponding structural column span, usually within 6.0m.

[0057] The present invention uses H-shaped steel 6 to connect the basement structure on both sides of the foundation pit partition wall 2. During construction, the foundation pit partition wall 2 can be removed layer by layer from top to bottom until all the foundation pit partition walls 2 above the bottom plate of the basement structure are removed.

[0058] After the foundation pit partition wall 2 is completely demolished, the basement structures on both sides are connected and stressed through the replacement support structure of each layer. After the post-cast strip 14 left by the demolition of the foundation pit partition wall 2 is cast and sealed, the H-shaped steel 6 can be demolished and recycled.

[0059] The horizontal force exerted on the basement structure is transmitted to the H-shaped steel 6 through the first support 4 / second support 5 on one side, and the H-shaped steel 6 then transmits the horizontal force to the opposite basement structure through the first support 4 / second support 5 on the other side, thereby achieving force balance on both sides of the partition wall.

[0060] The selection of the first support 4 or the second support 5 in the present invention can be determined by the distance between the basement structural columns 1 and the foundation pit partition wall 2 on both sides of the partition wall, as follows:

[0061] When the maximum distance between the foundation pit partition wall 2 and the structural column 1 is (please provide the maximum distance between the structural column 1 and the foundation pit partition wall 2), the first support 4 is selected. If the distance exceeds this, the second support 5 is selected. This ensures that the length of the force-transmitting component is minimized while ensuring reliable force connection and convenient construction, thereby shortening the force transmission distance and reducing the material used in the steel components.

[0062] In some embodiments, the first support 4 includes a steel anchor plate 7 and a plurality of column connecting steel bars 10 plug-welded on one side of the steel anchor plate 7;

[0063] The other side of the steel anchor plate 7 is fixed to one end of the H-shaped steel 6 by welding;

[0064] The dimensions of the multiple column connecting steel bars 10 match those of the corresponding structural columns 1 to meet the requirements of the anchoring structure;

[0065] The side length of the steel anchor plate 7 is less than or equal to the outer contour of the structural column;

[0066] The steel anchor plate 7 is anchored at the middle position of the side surface of the structural column 1 through a plurality of column connecting steel bars 10 .

[0067] In some embodiments, a plurality of column connecting steel bars 10 are arranged in a rectangular array or a circular array on a side where the steel anchor plate 7 is in contact with the structural column 1 .

[0068] In practical applications, 9 column connection steel bars 10 are usually used and arranged on the steel anchor plate 7 in a 3*3 array.

[0069] In some embodiments, two or more ribs 11 are provided between the corbel bottom plate 8 and the corbel end plate 9;

[0070] Each rib 11 is perpendicular to the corbel bottom plate 8 and the corbel end plate 9.

[0071] In some embodiments, a side of the corbel bottom plate 8 pre-embedded and cast in the structural beam plate 3 is provided with shear-resistant steel 12;

[0072] The shear-resistant steel 12 is pre-embedded and cast in the structural beam plate 3 , and is embedded in the center of the structural main beam 13 of the structural beam plate 3 .

[0073] In some embodiments, the shear-resistant steel 12 is a channel steel or an I-beam, and the embedded length meets the shear resistance requirement.

[0074] like Figures 6 to 9 As shown, the present invention also provides a replacement support construction method for removing the foundation pit partition wall 2 using the foundation pit partition wall replacement support structure, comprising the following steps:

[0075] Step 1: Construct the basement structure on both sides of the foundation pit partition wall 2 in stages from bottom to top. At the location of the structural beam slab 3 where the second support 5 is required, one side of the corresponding corbel bottom plate 8 is pre-embedded and cast in the structural beam slab 3.

[0076] Step 2: Wait. When the various structural layers above the basement floor that are affected by the external soil pressure are poured and tightly connected to the foundation pit partition wall 2, the conditions for removing the foundation pit partition wall 2 are met, and the foundation pit partition wall 2 is removed from top to bottom.

[0077] Step 3: Remove the foundation pit partition wall 2 to the top surface of the structural beam slab 3 where the replacement support is required. Where the first support 4 is required, install the corresponding steel anchor plate 7 in the middle of the side of the corresponding structural column 1;

[0078] Step 4: Complete the connection between the H-shaped steel 6 and the corresponding first support 4 or the corresponding second support 5;

[0079] Step 5: Repeat steps 3 to 4 until the replacement support structures of each structural layer above the basement structure floor affected by the external soil pressure are completed, and the foundation pit partition wall 2 is removed to below the floor;

[0080] Step 6: pour and seal the post-cast strip 14 formed by removing the foundation pit partition wall 2. When the concrete reaches the designed strength, remove and recycle the H-shaped steel 6.

[0081] In some embodiments, in step 4, fine stone concrete is poured into the joint gap of the H-shaped steel 6.

[0082] In practical applications, pouring fine stone concrete into the joint gap of H-shaped steel 6 can ensure a reliable force transmission connection.

[0083] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. Foundation pit partition wall replacement support structure; its characteristics are: The basement structure is arranged between two structural columns (1) or two structural beam plates (3) on both sides of a foundation pit partition wall (2), or between one structural column (1) and one structural beam plate (3), and includes a first support (4) arranged on the structural column (1) and / or a second support (5) arranged on the structural beam plate (3); H-shaped steel (6) for transmitting horizontal force is provided between the two first supports (4) of the two structural columns (1), between the two second supports (5) of the two structural beam plates (3), or between one first support (4) and one second support (5) between one structural column (1) and one structural beam plate (3); The first support (4) is connected to the corresponding structural column (1) via a steel anchor plate (7); The second support (5) is a steel corbel structure, comprising a corbel bottom plate (8) and a corbel end plate (9) at an angle of 90 degrees ± 5%; One side of each of the corbel bottom plates (8) is pre-embedded and cast in the structural beam plate (3); Each of the corbel end plates (9) is fixedly connected to the H-shaped steel (6); The distance between each of the first supports (4) and the foundation pit partition wall (2) is within half of the corresponding span of the structural column; The first support (4) comprises the steel anchor plate (7), and a plurality of column connecting steel bars (10) which are plug-welded on one side of the steel anchor plate (7); The other side of the steel anchor plate (7) is fixed to one end of the H-shaped steel (6) by welding; The sizes of the plurality of column connecting steel bars (10) match the sizes of the corresponding structural columns (1) to meet the requirements of the anchoring structure; The side length of the steel anchor plate (7) is less than or equal to the outer contour of the structural column; The steel anchor plate (7) is anchored at the middle position of the side surface of the structural column (1) through a plurality of column connecting steel bars (10); Two or more ribs (11) are provided between the corbel bottom plate (8) and the corbel end plate (9); Each of the ribs (11) is perpendicular to the corbel bottom plate (8) and the corbel end plate (9).

2. The foundation pit partition wall replacement support structure according to claim 1, characterized in that: A plurality of the column connecting steel bars (10) are arranged in a rectangular array or an annular array on a side of the steel anchor plate (7) that is in contact with the structural column (1).

3. The foundation pit partition wall replacement support structure according to claim 1, characterized in that: The corbel bottom plate (8) is pre-embedded and cast in the structural beam plate (3), and a shear-resistant steel (12) is provided on one side; The shear-resistant steel (12) is pre-embedded and cast in the structural beam plate (3), and is embedded in the center of the structural main beam (13) of the structural beam plate (3).

4. The foundation pit partition wall replacement support structure according to claim 3, characterized in that: The shear-resistant steel (12) is a channel steel or an I-beam, and the embedded length meets the shear resistance requirements.

5. A method for replacing a foundation pit partition wall by using the foundation pit partition wall replacement structure according to any one of claims 1 to 4, characterized in that: The steps include: Step 1: construct the basement structure on both sides of the foundation pit partition wall (2) in stages from bottom to top, and at the position of the structural beam plate (3) where the second support (5) needs to be set, pre-embed one side of the corresponding corbel bottom plate (8) in the structural beam plate (3); Step 2: Waiting. When the various structural layers above the bottom plate of the basement structure that are affected by the external soil pressure are cast and tightly connected to the foundation pit partition wall (2), the conditions for removing the foundation pit partition wall (2) are met, and the foundation pit partition wall (2) is removed from top to bottom. Step 3: dismantle the foundation pit partition wall (2) to the top surface of the structural beam plate (3) to be replaced, and set the corresponding steel anchor plate (7) in the middle of the side of the corresponding structural column (1) where the first support (4) needs to be set; Step 4: Complete the connection between the H-shaped steel (6) and the corresponding first support (4) or the corresponding second support (5); Step 5, repeating steps 3 to 4 until the replacement support structures of each structural layer above the bottom plate of the basement structure affected by the external soil pressure are completed, and the foundation pit partition wall (2) is removed to below the bottom plate; Step 6: pouring and sealing the post-casting strip (14) formed by removing the foundation pit partition wall (2); when the concrete reaches the designed strength, removing and recycling the H-shaped steel (6).

6. The method for replacing the support structure of the foundation pit partition wall (2) for dismantling the foundation pit partition wall according to claim 5, characterized in that: In step 4, fine stone concrete is poured into the gap between the H-shaped steel (6).

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