Basement retaining wall support replacement construction method

Abstract

The invention discloses a basement retaining wall support replacement construction method which comprises the steps that an underground diaphragm wall and underground structural columns are constructed, the underground structural columns comprise a first structural column and a second structural column, and an upper-layer horizontal beam is constructed; a soil body is excavated, the lower-layer horizontal beam is constructed, and the first structural column, the second structural column, the upper-layer horizontal beam and the lower-layer horizontal beam form a frame structure; mounting an inclined strut structure, wherein the inclined strut structure comprises an inclined strut beam, a top connecting seat and a bottom connecting seat; and foundation pit soil bodies are excavated in a partitioned mode, a basement structure is constructed, and after horizontal beams of the basement structure are communicated, the inclined strut structures are dismantled. According to the method, the first structural column, the second structural column, the upper-layer horizontal beam, the lower-layer horizontal beam and the inclined strut structure form a stable supporting system of the diaphragm wall, and the construction period is greatly shortened. In addition, the dismantled inclined strut structure can be repeatedly used, materials are saved, and the construction cost is reduced.

Description

Technical Field

[0001] The invention relates to a basement retaining wall support replacement construction method and belongs to the field of underground building structure construction. Background Art

[0002] During basement construction, the early ground-connected wall enclosure structure is often used as the basement exterior wall, and the basement horizontal beam is used as the horizontal support structure of the ground-connected wall, followed by soil excavation and basement construction. Since the basement horizontal beam is a reinforced concrete structure, it needs to reach a predetermined strength before it can play a supporting role. In addition, for large basements, the length of the horizontal support beam is hundreds or even thousands of meters. If the horizontal support beam is penetrated before the basement construction is carried out, the construction period will be extended. Summary of the invention

[0003] In view of the problem that the use of through horizontal support beams as the supporting structure of the ground-connected wall in the existing basement construction has a long construction period, the present invention provides a basement retaining wall support replacement construction method, which can quickly form effective support for the ground-connected wall and shorten the construction period.

[0004] In order to solve the above technical problems, the present invention includes the following technical solutions:

[0005] A basement retaining wall support replacement construction method comprises the following steps:

[0006] S1. Construct a ground connection wall around the foundation pit to be excavated, and construct underground structural columns, the underground structural columns include a first structural column and a second structural column, the first structural column is close to the inner side of the ground connection wall, the second structural column is spaced apart from the first structural column, and an upper horizontal beam is constructed between the first structural column and the second structural column;

[0007] S2. excavate the soil, construct the lower horizontal beam between the first structural column and the second structural column, and the first structural column, the second structural column, the upper horizontal beam, and the lower horizontal beam form a frame structure;

[0008] S3. A diagonal bracing structure is arranged in the frame structure, wherein the diagonal bracing structure comprises a diagonal bracing beam, a top connecting seat and a bottom connecting seat, wherein the top connecting seat is arranged at the connection between the upper horizontal beam and the first structural column, and the bottom connecting seat is arranged at the connection between the lower horizontal beam and the second structural column, and the two ends of the diagonal bracing beam are respectively fixed to the top connecting seat and the bottom connecting seat;

[0009] S4. Excavate the foundation pit in sections and construct the basement structure until the horizontal beams of the basement structure are connected, and then remove the diagonal bracing structure.

[0010] Further, the top connecting seat includes a first seat body, a first connecting plate and a first connecting rod;

[0011] The first connecting plate is arranged at an interval from the surface of the first seat body and fixed by a number of first connecting rods; a number of bolt holes are provided on the first connecting plate and connected to the end of the diagonal bracing structure by bolts.

[0012] Furthermore, the first seat body is a concrete block, the first connecting rods are anchor bars, 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.

[0013] 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 arranged on the surface of the second base and fixed to the second base by the second connecting rod. The fifth connecting rod is arranged at an interval from the fourth connecting plate and fixed by the third connecting rod; a number of bolt holes are provided on the fourth connecting plate for connecting to the end of the diagonal bracing structure by bolts.

[0014] Furthermore, the second seat body is a concrete block, the second connecting rods are anchor bars, 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.

[0015] Furthermore, the diagonal bracing beam includes a beam standard section and a servo mechanism;

[0016] Second connecting plates are provided at both ends of the beam standard section; the servo mechanism includes a hydraulic cylinder and a telescopic rod. Third connecting plates are provided at both ends of the servo mechanism. 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 for bolt connection with the first connecting plate, and the third connecting plate at one end of the telescopic rod is used for fixed connection with the fifth connecting plate.

[0017] Furthermore, in step S4, both ends of the diagonal bracing beam are fixed to the top connecting seat and the bottom connecting seat respectively, specifically:

[0018] First, make the telescopic rod of the servo mechanism in a contracted state;

[0019] Then install the diagonal bracing beam between the top connecting seat and the bottom connecting seat and fix the top of the diagonal bracing beam to the top connecting seat;

[0020] After that, control the telescopic rod of the servo mechanism to extend and fix the end of the telescopic rod to the bottom connecting seat.

[0021] Furthermore, the beam standard section adopts a steel-concrete structure, and the steel-concrete structure includes a steel section and concrete covering the steel section.

[0022] Due to the adoption of the above technical scheme, the present invention has the following advantages and positive effects compared with the prior art: the basement retaining wall replacement construction method provided by the present 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, and installs the diagonal bracing structure in the frame structure, thereby quickly forming the horizontal support structure of the ground-connected wall. Compared with the traditional ground-connected wall support construction method using a through horizontal support beam, the horizontal support beam with a length of hundreds or thousands of meters is converted into the construction of the upper horizontal beam, the lower horizontal beam and the diagonal bracing structure, which can quickly complete the support of the ground-connected wall and greatly shorten the construction period. Moreover, after the horizontal beam of the basement structure is through, it can support the ground-connected wall. At this time, the diagonal bracing structure can be removed to complete the replacement of the support, and the diagonal bracing structure can be reused to save materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a flow chart of a basement retaining wall support replacement construction method in one embodiment of the present invention;

[0024] Figure 2 A top view of a ground-connected wall, underground structural columns and upper horizontal beams in one embodiment of the present invention;

[0025] Figure 3 It is a longitudinal section view of the ground-connected wall, underground structural columns and upper horizontal beams in one embodiment of the present invention;

[0026] Figure 4 It is a schematic structural diagram of a top connecting seat in one embodiment of the present invention;

[0027] Figure 5 is a structural schematic diagram of a diagonal bracing structure in one embodiment of the present invention;

[0028] Figure 6 It is a schematic structural diagram of a bottom connecting seat in one embodiment of the present invention;

[0029] Figure 7 It is a schematic structural diagram of a diagonal bracing beam in one embodiment of the present invention.

[0030] The numbers in the figure are as follows:

[0031] 1-ground-connected wall; 2-first structural column; 3-second structural column; 4-upper horizontal beam; 5-lower horizontal beam;

[0032] 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-beam standard 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 DESCRIPTION

[0033] The following is a further detailed description of a basement retaining wall replacement construction method provided by the present invention in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer in conjunction with the following description. It should be noted that the accompanying drawings are all 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.

[0034] The basement includes the basement outer wall (basement retaining wall), underground structural columns and horizontal beams, and of course also includes the basement top plate, bottom plate, floor plate and other structures. Usually, the ground-connected wall as the foundation pit enclosure structure is used as the basement outer wall, and the horizontal support beam of the ground-connected wall is also used as the horizontal beam of the basement. For the sake of distinction, the traditional horizontal support structure on the ground-connected wall with both ends directly against the two sides of the foundation pit is called a horizontal support beam, and the beam of the basement is called a horizontal beam. When the horizontal beam of the basement is penetrated and the two ends directly provide horizontal support for the ground-connected wall, it can also be called a horizontal support beam. For large basement structures, the length and width of the basement may reach hundreds of meters or even thousands of meters. If the horizontal support beam is penetrated before the basement is constructed, a long construction period will be wasted. In order to shorten the construction period, the present invention first constructs the horizontal beam of the basement between the two rows of underground structural columns in the outermost circle, so that the horizontal beam and the vertical structural column form a rectangular frame structure, and then by setting a prefabricated diagonal bracing beam, the frame structure forms a stable force system to provide horizontal support for the ground-connected wall, and then the basement structure inside the foundation pit can be constructed synchronously in different areas, which greatly improves the construction efficiency and shortens the construction period. Specifically, combined Figures 1 to 3 As shown, the basement retaining wall replacement construction method provided in this embodiment includes the following steps:

[0035] S1. Construct a ground wall 1 around the foundation pit to be excavated, 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 ground wall, the second structural column 3 is spaced apart from the first structural column 2, and an upper horizontal beam 4 is arranged 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 the improvements of the present invention, and will not be described in detail;

[0036] S2 excavation soil, set the 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, the lower horizontal beam 5 to form a frame structure;

[0037] S3. A diagonal bracing structure 10 is arranged in the frame structure, wherein the diagonal bracing structure 10 comprises a diagonal bracing beam 12, a top connecting seat 11 and a bottom connecting seat 13, wherein the top connecting seat 11 is arranged at the connection between the upper horizontal beam 4 and the first structural column 2, and the bottom connecting seat 13 is arranged at the connection between the lower horizontal beam 5 and the second structural column 3, and both ends of the diagonal bracing beam 12 are fixed to the top connecting seat 11 and the bottom connecting seat 13 respectively;

[0038] S4. Excavate the foundation pit in sections and construct the basement structure until the horizontal beams of the basement structure are connected, and then remove the diagonal bracing structure.

[0039] The basement retaining wall replacement construction method provided in this embodiment can quickly form the horizontal support structure of the ground-connected wall only after the upper horizontal beam and the lower horizontal beam are set between the first structural column and the second structural column and the diagonal support structure is installed. Compared with the traditional method that the ground-connected wall can only be supported after the construction of hundreds of meters or thousands of meters of horizontal support beams is completed, the present embodiment only constructs a few meters of upper horizontal beams and lower horizontal beams, which will greatly reduce the initial construction time, quickly form effective support for the ground-connected wall, and shorten the construction period. Moreover, the connected upper horizontal beams, lower horizontal beams and underground structural columns form the frame structure of the basement. After the diagonal support structure is removed, the ground-connected wall is supported by the frame structure of the basement to complete the replacement of the support. The removed diagonal support structure can be reused, saving materials and reducing costs.

[0040] In a specific embodiment, in combination 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. As an example, the first seat body is a concrete block, and the first connecting rod is an anchor bar, one end of which is buried in the concrete block, and the other end is welded and fixed to the first connecting plate. A plurality of bolt holes are provided on the first connecting plate, which is connected to the end of the diagonal bracing structure by bolts 114, and the gap between the first connecting plate and the first seat body can provide an operating space for the installation of the bolts 114. The first seat body is a right-angled 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 is made of other materials, such as steel plates welded together. The bottom connecting seat and the top connecting seat can be set to the same structural form.

[0041] In a specific embodiment, in combination 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 is fixed to the second base through the second connecting rod. The fifth connecting rod is disposed at an interval from the fourth connecting plate and is fixed through the third connecting rod. A plurality of bolt holes are provided on the fourth connecting plate for connecting with the end of the diagonal bracing structure through bolts 136. The gap between the fourth connecting plate and the fifth connecting plate can provide an operating space for the installation of the bolts 136. As an example, the second seat body 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 seat body is a right trapezoid, and the inclination angle of the hypotenuse matches the inclination angle after the diagonal bracing structure is installed. Of course, the second seat body can be made of other materials, such as welded by steel plates. The bottom connecting seat and the top connecting seat can be set in the same structural form.

[0042] In a specific embodiment, in order to improve the applicability of the diagonal bracing structure and the convenience of installation and removal, in combination with Figure 4 and Figure 7 as shown, the diagonal bracing beam 12 includes a beam standard section 121 and a servo mechanism 122. The beam standard section can be made of a steel structure or a steel-concrete structure. When using a steel-concrete structure, concrete is coated on the outside of the steel section. The concrete can improve the moment of inertia and durability of the steel section. Second connecting plates 123 are provided at both ends of the beam standard section, and third connecting plates 135 are 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 beam standard section is fixedly connected to the third connecting plate at one end of the hydraulic cylinder of the servo mechanism through bolts. The second connecting plate at the other end of the beam standard section is used for bolt connection with the first connecting plate, and the third connecting plate at one end of the telescopic rod is used for fixed connection with the fifth connecting plate. When installing the diagonal bracing beam, first make the telescopic rod of the servo mechanism in a contracted state, then install the diagonal bracing beam between the top connecting seat and the bottom connecting seat, fix the top of the diagonal bracing beam to the top connecting seat by bolts, and then control the telescopic rod of the servo mechanism to extend, so that the end of the telescopic rod is fixedly connected to the bottom connecting seat by bolts.

[0043] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, 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, it should be considered as the scope described in this specification.

[0044] The above-described embodiments merely represent several implementation manners of the present invention. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the appended claims.

Claims

1. A construction method for replacing struts of a basement retaining wall, characterized in that, The steps include: S1. Construct a ground connection wall around the foundation pit to be excavated, and construct underground structural columns, the underground structural columns include a first structural column and a second structural column, the first structural column is close to the inner side of the ground connection wall, the second structural column is spaced apart from the first structural column, and an upper horizontal beam is constructed between the first structural column and the second structural column; S2. excavate the soil, construct the lower horizontal beam between the first structural column and the second structural column, and 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 arranged in the frame structure, wherein the diagonal bracing structure comprises a diagonal bracing beam, a top connecting seat and a bottom connecting seat, wherein the top connecting seat is arranged at the connection between the upper horizontal beam and the first structural column, and the bottom connecting seat is arranged at the connection between the lower horizontal beam and the second structural column, and the two ends of the diagonal bracing beam are respectively fixed to the top connecting seat and the bottom connecting seat; S4. Excavate the foundation pit in sections and construct the basement structure until the horizontal beams of the basement structure are connected, and then remove the diagonal bracing structure.

2. The basement retaining wall replacement construction method according to claim 1, characterized in that: The top connecting seat comprises 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 seat body and fixed by a plurality of first connecting rods; a plurality of bolt holes are arranged on the first connecting plate and connected to the end of the diagonal bracing structure by bolts.

3. The basement retaining wall replacement construction method according to claim 2, characterized in that: The first seat body is a concrete block, the first connecting rod is an anchor bar, one end of the anchor bar is buried in the concrete block, and the other end is welded and fixed to the first connecting plate.

4. The basement retaining wall replacement construction method according to claim 1, characterized in that: 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 arranged on the surface of the second base and is fixed to the second base through the second connecting rod. The fifth connecting rod is spaced apart from the fourth connecting plate and is fixed through the third connecting rod. A plurality of bolt holes are arranged on the fourth connecting plate for connecting to the end of the diagonal bracing structure through bolts.

5. The basement retaining wall replacement construction method according to claim 2, characterized in that: The second seat body is a concrete block, the second connecting rod is an anchor bar, one end of the anchor bar is buried in the concrete block, and the other end is welded and fixed to the second connecting plate.

6. The basement retaining wall replacement construction method according to claim 1, characterized in that: The diagonal bracing beam includes a beam standard section and a servo mechanism; A second connecting plate is provided at both ends of the standard section of the beam; the servo mechanism includes a hydraulic cylinder and a telescopic rod, and a third connecting plate is provided at both ends of the servo mechanism, and the second connecting plate at one end of the standard section of the beam is fixedly connected with 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 standard section of the beam 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 with the fifth connecting plate.

7. The basement retaining wall replacement construction method according to claim 6, characterized in that: In step S4, the two ends of the diagonal bracing beam are respectively fixed to the top connecting seat and the bottom connecting seat, specifically: First, make the telescopic rod of the servo mechanism in a retracted state; Then install the diagonal bracing beam between the top connecting seat and the bottom connecting seat, and fix the top of the diagonal bracing beam to the top connecting seat; After that, control the telescopic rod of the servo mechanism to extend, and fix the end of the telescopic rod to the bottom connecting seat.

8. The construction method for replacing the bracing of the basement retaining wall according to claim 6, wherein The standard beam section adopts a steel-concrete structure, and the steel-concrete structure includes profiled steel and concrete covering the profiled steel.

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