A basement retaining wall bracing construction method

Abstract

The application discloses a basement retaining wall bracing construction method, comprising the following steps: constructing a diaphragm wall and an underground structure column, wherein the underground structure column comprises a first structure column and a second structure column; constructing an upper horizontal beam; excavating soil; constructing a lower horizontal beam; the first structure column, the second structure column, the upper horizontal beam and the lower horizontal beam form a frame structure; installing a diagonal bracing structure, wherein the diagonal bracing structure comprises a diagonal bracing beam, a top connecting seat and a bottom connecting seat; excavating the soil in a base pit in sections and constructing a basement structure; and after the horizontal beams of the basement structure are connected, the diagonal bracing structure is removed. The method forms a stable support system of the diaphragm wall by the first structure column, the second structure column, the upper horizontal beam, the lower horizontal beam and the diagonal bracing structure, thereby greatly shortening the construction period. Moreover, the removed diagonal bracing structure can be reused, thereby saving materials and reducing construction cost.

Description

Technical Field

[0001] This invention relates to a method for replacing the support of a basement retaining wall, belonging to the field of underground building structure construction. Background Technology

[0002] In basement construction, the existing diaphragm wall enclosure is often used as the basement's exterior wall, and the basement's horizontal beams serve as the horizontal support structure for the diaphragm wall, before excavation and basement construction proceed. Since the basement's horizontal beams are reinforced concrete structures, they only function as supports after reaching their predetermined strength. Furthermore, for large basements, the length of the horizontal support beams can reach hundreds or even thousands of meters. If the horizontal support beams were to be continuous before basement construction, it would extend the construction period. Summary of the Invention

[0003] To address the issue of long construction periods associated with using continuous horizontal support beams as the supporting structure for diaphragm walls in existing basement construction, this invention provides a method for replacing the support beams of basement retaining walls. This method can quickly provide effective support for diaphragm walls and shorten the construction period.

[0004] To solve the above technical problems, the present invention includes the following technical solutions: A method for replacing the support of a basement retaining wall includes the following steps: S1. Construct diaphragm walls around the foundation pit to be excavated, and construct underground structural columns, including a first structural column and a second structural column. The first structural column is close to the inner side of the diaphragm wall, and the second structural column is set at intervals with the first structural column. Construct an upper-level horizontal beam between the first structural column and the second structural column. S2. Excavate the soil and construct the lower horizontal beam between the first structural column and the second structural column. The first structural column, the second structural column, the upper horizontal beam, and the lower horizontal beam form a frame structure. S3. A diagonal bracing structure is provided within the frame structure. The diagonal bracing structure includes a diagonal bracing beam, a top connecting seat, and a bottom connecting seat. The top connecting seat is located at the connection between the upper horizontal beam and the first structural column, and the bottom connecting seat is located at the connection between the lower horizontal beam and the second structural column. The two ends of the diagonal bracing beam are fixed to the top connecting seat and the bottom connecting seat, respectively. S4. Excavate the foundation pit in sections and construct the basement structure until the horizontal beams of the basement structure are completed, then remove the diagonal bracing structure.

[0005] Furthermore, the top connecting seat includes a first seat body, a first connecting plate, and a first connecting rod; The first connecting plate is spaced apart from the surface of the first base body and is fixed by a number of first connecting rods; the first connecting plate is provided with a number of bolt holes and is connected to the end of the diagonal brace structure by bolts.

[0006] Furthermore, the first base is a concrete block, and the first connecting rod is an anchor bar. One end of the anchor bar is embedded in the concrete block, and the other end is welded and fixed to the first connecting plate.

[0007] Furthermore, the bottom connecting seat includes a second base, a fourth connecting plate, a second connecting rod, a fifth connecting plate, and a third connecting rod. The fourth connecting plate is disposed on the surface of the second base and is fixed to the second base by the second connecting rod. The fifth connecting rod is spaced apart from the fourth connecting plate and is fixed by the third connecting rod. The fourth connecting plate is provided with several bolt holes for bolt connection to the end of the diagonal brace structure.

[0008] Furthermore, the second base is a concrete block, and the second connecting rod is an anchor bar. One end of the anchor bar is embedded in the concrete block, and the other end is welded and fixed to the second connecting plate.

[0009] Furthermore, the diagonal bracing beam includes standard beam sections and a servo mechanism; The beam standard section has a second connecting plate at both ends; the servo mechanism includes a hydraulic cylinder and a telescopic rod, and the servo mechanism has a third connecting plate at both ends. The second connecting plate at one end of the beam standard section is fixedly connected to the third connecting plate at one end of the hydraulic cylinder of the servo mechanism by bolts; the second connecting plate at the other end of the beam standard section is used to be bolted to the first connecting plate, and the third connecting plate at one end of the telescopic rod is used to be fixedly connected to the fifth connecting plate.

[0010] Furthermore, in step S4, both ends of the diagonal brace are fixed to the top connecting seat and the bottom connecting seat, respectively, specifically as follows: First, put the telescopic rod of the servo mechanism in the retracted state; Then, the diagonal brace beam is installed between the top connecting seat and the bottom connecting seat, and the top of the diagonal brace beam is fixed to the top connecting seat; Then, the telescopic rod of the control servo mechanism is extended so that the end of the telescopic rod is fixed to the bottom connecting seat.

[0011] Furthermore, the standard beam section adopts a steel-concrete structure, which includes steel sections and concrete covering the steel sections.

[0012] This invention, by employing the above technical solution, offers the following advantages and positive effects compared to existing technologies: The basement retaining wall replacement construction method provided by this invention first constructs the first structural column, the second structural column, the upper horizontal beam, and the lower horizontal beam to form a frame structure. Then, a diagonal bracing structure is installed within this frame structure, thereby quickly forming the horizontal support structure for the diaphragm wall. Compared to the traditional method of using continuous horizontal support beams for diaphragm wall support, this method transforms the length of the horizontal support beams (hundreds or thousands of meters) into the construction of upper horizontal beams, lower horizontal beams, and diagonal bracing structures, enabling rapid completion of the diaphragm wall support and significantly shortening the construction period. Furthermore, once the horizontal beams of the basement structure are continuous, they can support the diaphragm wall. At this point, the diagonal bracing structure can be removed to complete the replacement, and the diagonal bracing structure can be reused, saving materials. Attached Figure Description

[0013] Figure 1 This is a flowchart of a basement retaining wall replacement construction method according to an embodiment of the present invention; Figure 2 This is a top view of the diaphragm wall, underground structural column, and upper horizontal beam in one embodiment of the present invention; Figure 3 This is a longitudinal sectional view of the diaphragm wall, underground structural column and upper horizontal beam in one embodiment of the present invention; Figure 4 This is a schematic diagram of the diagonal bracing structure in one embodiment of the present invention; Figure 5 This is a schematic diagram of the top connecting seat in one embodiment of the present invention; Figure 6 This is a schematic diagram of the bottom connecting seat in one embodiment of the present invention; Figure 7 This is a schematic diagram of the diagonal bracing beam in one embodiment of the present invention.

[0014] The numbers in the diagram are as follows: 1-Diaphragm wall; 2-First structural column; 3-Second structural column; 4-Upper-level horizontal beam; 5-Lower-level horizontal beam; 10-Diagonal bracing structure; 11-Top connecting seat; 111-First seat body; 112-First connecting plate; 113-First connecting rod; 114-Bolt; 12-Diagonal bracing beam; 121-Standard beam section; 122-Servo mechanism; 123-Second connecting plate; 124-Third connecting plate; 13-Bottom connecting seat; 131-Second base; 132-Fourth connecting plate; 133-Second connecting rod; 134-Fifth connecting plate; 135-Third connecting rod; 136-Bolt. Detailed Implementation

[0015] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a method for constructing a basement retaining wall replacement system according to the present invention. The advantages and features of the present invention will become clearer from the following description. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0016] The basement includes the basement exterior walls (basement retaining walls), underground structural columns, and horizontal beams, as well as the basement roof slab, floor slab, and other structural elements. Typically, the diaphragm wall, which serves as the foundation pit retaining structure, is considered the basement exterior wall, and the horizontal support beams of the diaphragm wall also serve as the basement horizontal beams. For clarity, the horizontal support structure of the traditional diaphragm wall, whose ends directly abut against both sides of the foundation pit, is called a horizontal support beam, while the beams of the basement are simply called horizontal beams. When the basement horizontal beam runs through the entire structure and provides horizontal support to the diaphragm wall at both ends, it can also be called a horizontal support beam. For large basement structures, the length and width can reach hundreds or even thousands of meters. If the horizontal support beam were to run through the entire structure before basement construction, it would waste a significant amount of construction time. To shorten the construction period, this invention first constructs the basement horizontal beams between the two outermost rows of underground structural columns, forming a rectangular frame structure with the vertical structural columns. Then, by setting prefabricated diagonal bracing beams, the frame structure forms a stable load-bearing system, providing horizontal support to the diaphragm wall. The basement structure inside the foundation pit can then be constructed in sections simultaneously, greatly improving construction efficiency and shortening the construction period. Specifically, in combination Figures 1 to 3 As shown, the basement retaining wall replacement construction method provided in this embodiment includes the following steps: S1. Construct diaphragm walls 1 around the perimeter of the excavation pit, and construct underground structural columns. The underground structural columns include a first structural column 2 and a second structural column 3. The first structural column 2 is close to the inner side of the diaphragm wall, and the second structural column 3 is spaced apart from the first structural column 2. An upper horizontal beam 4 is installed between the first structural column and the second structural column. Of course, the underground structural columns also include other structural columns located inside the second structural column. These structural columns do not involve improvements of the present invention and will not be described in detail. S2. Excavate the soil and set up a lower horizontal beam 5 between the first structural column and the second structural column. The first structural column 2, the second structural column 3, the upper horizontal beam 4, and the lower horizontal beam 5 form a frame structure. S3. A diagonal bracing structure 10 is provided within the frame structure. The diagonal bracing structure 10 includes a diagonal bracing beam 12, a top connecting seat 11, and a bottom connecting seat 13. The top connecting seat 11 is located at the connection between the upper horizontal beam 4 and the first structural column 2, and the bottom connecting seat 13 is located at the connection between the lower horizontal beam 5 and the second structural column 3. The two ends of the diagonal bracing beam 12 are fixed to the top connecting seat 11 and the bottom connecting seat 13, respectively. S4. Excavate the foundation pit in sections and construct the basement structure until the horizontal beams of the basement structure are completed, then remove the diagonal bracing structure.

[0017] The basement retaining wall replacement construction method provided in this embodiment only requires the installation of upper and lower horizontal beams and diagonal bracing structures between the first and second structural columns to quickly form a horizontal support structure for the diaphragm wall. Compared to the traditional method where hundreds or thousands of meters of horizontal support beams must be constructed before the diaphragm wall can be supported, this embodiment only requires the construction of a few meters of upper and lower horizontal beams, significantly reducing the initial construction time, quickly forming effective support for the diaphragm wall, and shortening the construction period. Moreover, the continuous upper and lower horizontal beams, together with the underground structural columns, form the frame structure of the basement. After the diagonal bracing structure is removed, the diaphragm wall is supported by the basement frame structure, completing the replacement. The removed diagonal bracing structure can be reused, saving materials and reducing costs.

[0018] In one specific embodiment, combined with Figure 4 and Figure 5 As shown, the top connecting seat 11 includes a first seat body 111, a first connecting plate 112, and a first connecting rod 113. The first connecting plate is spaced apart from the surface of the first seat body and is fixed by a plurality of first connecting rods. For example, the first seat body is a concrete block, and the first connecting rod is an anchor bar, one end of which is embedded in the concrete block, and the other end is welded to the first connecting plate. The first connecting plate is provided with a plurality of bolt holes, and is connected to the end of the diagonal bracing structure by bolts 114. The gap between the first connecting plate and the first seat body provides operating space for the installation of the bolts 114. The first seat body is a right trapezoid, and the inclination angle of the hypotenuse matches the inclination angle of the diagonal bracing structure after installation. Of course, the first seat body can be made of other materials, such as welded steel plates. The bottom connecting seat and the top connecting seat can be configured with the same structural form.

[0019] In one specific embodiment, combined with Figure 4 and Figure 6As shown, the bottom connecting seat 13 includes a second base 131, a fourth connecting plate 132, a second connecting rod 133, a fifth connecting plate 134, and a third connecting rod 135. The fourth connecting plate is disposed on the surface of the second base and fixed to the second base by the second connecting rod. The fifth connecting rod is spaced apart from the fourth connecting plate and fixed by the third connecting rod. The fourth connecting plate has several bolt holes for connection to the end of the diagonal brace structure via bolts 136. The gap between the fourth and fifth connecting plates provides operating space for the installation of the bolts 136. For example, the second base is a concrete block, and the second connecting rod is an anchor bar. One end of the anchor bar is embedded in the concrete block, and the other end is welded and fixed to the second connecting plate. The second base is a right-angled trapezoid, and the angle of the hypotenuse matches the tilt angle of the diagonal brace structure after installation. Of course, the second base can be made of other materials, such as welded steel plates. The bottom connecting seat and the top connecting seat can be configured with the same structural form.

[0020] In one specific embodiment, to improve the applicability of the diagonal bracing structure and the convenience of installation and dismantling, combined with Figure 4 and Figure 7 As shown, the diagonal bracing beam 12 includes a standard beam section 121 and a servo mechanism 122. The standard beam section can be a steel structure or a steel-concrete structure. When using a steel-concrete structure, concrete is wrapped around the steel section, which improves the moment of inertia and durability of the steel section. A second connecting plate 123 is provided at both ends of the standard beam section, and a third connecting plate 124 is provided at both ends of the servo mechanism. The servo mechanism 122 includes a hydraulic cylinder and a telescopic rod. The second connecting plate at one end of the standard beam section is bolted to the third connecting plate at one end of the hydraulic cylinder of the servo mechanism. The second connecting plate at the other end of the standard beam section is bolted to the first connecting plate, and the third connecting plate at one end of the telescopic rod is bolted to the fifth connecting plate. During installation of the diagonal bracing beam, the telescopic rod of the servo mechanism is first retracted. Then, the diagonal bracing beam is installed between the top connecting seat and the bottom connecting seat, and the top of the diagonal bracing beam is bolted to the top connecting seat. Afterward, the telescopic rod of the servo mechanism is extended, and the end of the telescopic rod is bolted to the bottom connecting seat.

[0021] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0022] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A basement retaining wall underpinning construction method, characterized by, Includes the following steps: S1. Construct diaphragm walls around the foundation pit to be excavated, and construct underground structural columns, including a first structural column and a second structural column. The first structural column is close to the inner side of the diaphragm wall, and the second structural column is set at intervals with the first structural column. Construct an upper-level horizontal beam between the first structural column and the second structural column. S2. Excavate the soil and construct the lower horizontal beam between the first structural column and the second structural column. The first structural column, the second structural column, the upper horizontal beam, and the lower horizontal beam form a frame structure. S3. A diagonal bracing structure is provided within the frame structure. The diagonal bracing structure includes a diagonal bracing beam, a top connecting seat, and a bottom connecting seat. The top connecting seat is located at the connection between the upper horizontal beam and the first structural column, and the bottom connecting seat is located at the connection between the lower horizontal beam and the second structural column. Both ends of the diagonal bracing beam are fixed to the top connecting seat and the bottom connecting seat, respectively. The top connecting seat includes a first base, a first connecting plate, and a first connecting rod. The first connecting plate is spaced apart from the surface of the first base and fixed by a plurality of first connecting rods. The first connecting plate has a plurality of bolt holes for connection to the end of the diagonal bracing beam by bolts. The bottom connecting seat includes a second base, a fourth connecting plate, a second connecting rod, a fifth connecting plate, and a third connecting rod. The fourth connecting plate... The fifth connecting plate is set on the surface of the second base and fixed to the second base by the second connecting rod. The fifth connecting plate is spaced apart from the fourth connecting plate and fixed by the third connecting rod. The fifth connecting plate is provided with several bolt holes for bolt connection to the end of the diagonal brace beam. The diagonal brace beam includes a standard beam section and a servo mechanism. The two ends of the standard beam section are provided with second connecting plates. The servo mechanism includes a hydraulic cylinder and a telescopic rod. The two ends of the servo mechanism are provided with third connecting plates. The second connecting plate at one end of the standard beam section is bolted to the third connecting plate at one end of the hydraulic cylinder of the servo mechanism. The second connecting plate at the other end of the standard beam section is bolted to the first connecting plate, and the third connecting plate at one end of the telescopic rod is fixedly connected to the fifth connecting plate. S4. Excavate the foundation pit soil in sections and construct the basement structure until the horizontal beam of the basement structure is completed, then remove the diagonal bracing structure. In step S3, the two ends of the diagonal brace are fixed to the top connecting seat and the bottom connecting seat, respectively, specifically: First, put the telescopic rod of the servo mechanism in the retracted state; Then, the diagonal brace beam is installed between the top connecting seat and the bottom connecting seat, and the top of the diagonal brace beam is fixed to the top connecting seat; Then, the telescopic rod of the control servo mechanism is extended so that the end of the telescopic rod is fixed to the bottom connecting seat.

2. The method for replacing the retaining wall in a basement as described in claim 1, characterized in that, The first base is a concrete block, and the first connecting rod is an anchor bar. One end of the anchor bar is embedded in the concrete block, and the other end is welded and fixed to the first connecting plate.

3. The method for replacing the retaining wall of a basement as described in claim 1, characterized in that, The second base is a concrete block, and the second connecting rod is an anchor bar. One end of the anchor bar is embedded in the concrete block, and the other end is welded and fixed to the fourth connecting plate.

4. The method for replacing the support of a basement retaining wall as described in claim 1, characterized in that, The standard beam section adopts a steel-concrete structure, which includes steel sections and concrete covering the steel sections.

Images