Method for synchronous construction of diaphragm wall lining wall and structure outer wall

Abstract

The application discloses a diaphragm wall lining wall and structure outer wall synchronous construction method, which comprises the following steps: 1, diaphragm wall flanging, embedded parts and pouring construction; 2, coping beam and inner support construction; 3, foundation pit excavation, inner support below earthwork excavation; 4, raft construction, raft steel bars are connected with the embedded parts of the diaphragm wall; 5, the inner side of the diaphragm wall is chiseled, the lining wall and the floor structure are synchronously constructed, the lining wall, the diaphragm wall and the floor structure form an entirety; 6, inner support removal; 7, the steel bars near the inner side of the structure outer wall in the lining wall are lengthened to form wall body inner side vertical steel bars, and the steel bars near the outer side of the structure outer wall in the diaphragm wall are lengthened to form wall body outer side vertical steel bars; 8, the lining wall, the structure outer wall and other vertical structures of the floor where the inner support is located are synchronously poured. The application relates to the technical field of building construction and can solve the problems of low construction efficiency, large welding quantity and poor integrity of the lining wall and the diaphragm wall structure in the prior art.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a method for the simultaneous construction of the inner lining wall and the outer structural wall of a diaphragm wall. Background Technology

[0002] In the construction of deep foundation pits in confined spaces, due to site constraints, diaphragm walls are often used as both structural exterior walls. To ensure structural safety and waterproofing quality, anchor bolts are generally not used during construction; instead, internal bracing is employed. Because the thickness of the diaphragm wall in ultra-deep foundation pits is often less than the thickness of the structural exterior walls, an inner lining wall needs to be constructed inside the diaphragm wall for reinforcement to ensure structural strength.

[0003] The traditional construction method involves extending the vertical reinforcement bars of the diaphragm wall to the top of the capping beam. During the construction of the capping beam, reinforcement bars for the upper structure's exterior walls are then installed. To ensure structural safety, the outer reinforcement bars of the upper structure's exterior walls are welded to the diaphragm wall reinforcement, while the inner reinforcement bars can be anchored to the capping beam using hooks. This traditional method suffers from high welding volume, slow construction efficiency, and high cost. Furthermore, an inner lining wall must be constructed inside the diaphragm wall to achieve the required thickness for the exterior wall. The sequential construction of the inner lining wall and the diaphragm wall results in poor structural integrity and is detrimental to structural safety. Therefore, a method is needed to simultaneously construct the diaphragm wall's inner lining wall and the exterior wall, addressing the problems of low construction efficiency, high welding volume, and poor structural integrity between the inner lining wall and the diaphragm wall in existing technologies. Summary of the Invention

[0004] The purpose of this invention is to provide a method for simultaneous construction of the inner lining wall and the outer structural wall of a diaphragm wall, which can solve the problems of low construction efficiency, large welding volume, and poor structural integrity of the inner lining wall and the diaphragm wall in the prior art.

[0005] This invention is implemented as follows:

[0006] A method for simultaneous construction of the inner lining wall and the outer structural wall of a diaphragm wall, characterized by the following steps:

[0007] Step 1: Construction of diaphragm walls, including the construction of reinforcing bars and embedded parts, and the pouring of concrete.

[0008] Step 2: Construction of the capping beam and internal supports, including the reinforcement construction and pouring of the capping beam and internal supports;

[0009] Step 3: Excavation of the foundation pit, removal of soil below the internal supports;

[0010] Step 4: Install the reinforcement of the raft foundation and connect the reinforcement of the raft foundation to the embedded parts of the diaphragm wall;

[0011] Step 5: Roughen the inner surface of the diaphragm wall. The inner lining wall is constructed simultaneously with the floor structure, so that the inner lining wall, the diaphragm wall and the floor structure form a whole.

[0012] Step 6: Remove the internal supports;

[0013] Step 7: Extend the steel bars inside the inner lining wall that are close to the inner side of the outer wall of the structure to form the inner vertical bars of the wall; extend the steel bars inside the diaphragm wall that are close to the outer side of the outer wall of the structure to form the outer vertical bars of the wall.

[0014] Step 8: Simultaneously pour the inner lining wall, structural outer wall and other vertical structures of the floor where the internal support is located.

[0015] In step 1, the reinforcing bars of the diaphragm wall include a first vertical bar close to the main structure, a second vertical bar away from the main structure, and stirrups connected to the first and second vertical bars; the first vertical bar is partially extended to below the top surface of the capping beam, and the second vertical bar is partially extended to the interior of the outer wall of the structure.

[0016] In step 1, during the construction of the reinforcing bars, the first and second vertical bars are staggered along the length of the wall.

[0017] In step 1, the embedded parts include several vertically spaced ground wall anchor bars embedded in the diaphragm wall. One end of each ground wall anchor bar is welded to the first vertical bar and the stirrup, and the other end of each ground wall anchor bar is anchored into the diaphragm wall.

[0018] In step 2, the top and bottom surfaces of the capping beam are flush with the top and bottom surfaces of the inner support, respectively. One end of the capping beam, which connects to one end of the inner support, is flush with the inner side of the diaphragm wall. The other end of the capping beam can be connected to the original diaphragm wall located outside the diaphragm wall, and the other end of the inner support is connected to the main structure.

[0019] In step 4, at the height of the top main reinforcement of the raft slab, one end of the bottom plate anchoring reinforcement is connected to the embedded part at that height, and the other end of the bottom plate anchoring reinforcement is connected to the top main reinforcement; at the height of the bottom main reinforcement of the raft slab, one end of the waterstop steel plate is connected to the embedded part at that height, and the other end of the waterstop steel plate is connected to the bottom main reinforcement.

[0020] In step 5, when constructing the top slab reinforcement of the floor structure, the end of the top slab reinforcement closest to the diaphragm wall is connected to the embedded part of the diaphragm wall at the same height. The inner lining wall is constructed simultaneously with the floor structure to the top slab of the structure adjacent to the inner support.

[0021] In step 5, the inner lining wall anchor bars are constructed inside the inner lining wall. One end of the inner lining wall anchor bars is connected to the embedded part of the diaphragm wall, and the other end of the inner lining wall anchor bars is anchored inside the inner lining wall. The third vertical bar inside the inner lining wall is extended to the outer wall of the structure.

[0022] In step 7, the joints of two adjacent reinforcing bars are coaxially connected by a straight threaded sleeve.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] 1. By optimizing the height of the first and second vertical bars in the diaphragm wall, this invention greatly reduces on-site welding of steel bars and reduces preparatory work such as inserting reinforcement bars into the external wall before the construction of internal supports. The construction of internal supports can be completed in advance, and the splicing of steel bars in the external wall can be inserted during the curing period of internal supports. This is conducive to advancing the overall construction progress and can improve construction efficiency while ensuring construction quality.

[0025] 2. In this invention, the third vertical bar of the inner lining wall adjacent to the inner support is used as the inner side vertical bar of the wall. After the inner support is removed, the vertical bars on the inner and outer sides of the outer wall of the structure above the inner support are extended. The outer wall of the structure above the inner support is then poured simultaneously with the diaphragm wall and the inner lining wall on the same floor below the inner support, ensuring the integrity of the structure, the reliability of the structural stress and the quality of waterproofing.

[0026] 3. This invention allows for the simultaneous construction of the inner lining wall and the outer structural wall. The capping beam can be constructed directly based on the thickness of the outer structural wall. The inner lining wall within the height of the capping beam does not require secondary construction. During the construction of the capping beam, the second vertical reinforcement of the diaphragm wall is extended, and the third vertical reinforcement in the inner lining wall serves as the inner vertical reinforcement of the outer structural wall. This improves construction efficiency, enhances the waterproofing quality at the joint between the diaphragm wall and the outer structural wall, ensures the integrity of the structure, and guarantees construction safety. Attached Figure Description

[0027] Figure 1 This is a front view of the reinforcement construction in step 1 of the synchronous construction method of the inner lining wall and the outer wall of the diaphragm wall of the present invention.

[0028] Figure 2 This is a side view of the reinforcement construction in step 1 of the synchronous construction method of the inner lining wall and the outer wall of the diaphragm wall of the present invention.

[0029] Figure 3 This is a schematic diagram of the construction of embedded parts in step 1, the capping beam and internal support in step 2, and the raft slab construction in step 4 of the synchronous construction method of the inner lining wall and the outer structural wall of the diaphragm wall of the present invention.

[0030] Figure 4 This is a construction diagram of the floor structure in step 5 of the synchronous construction method of the inner lining wall and the outer structural wall of the diaphragm wall of the present invention.

[0031] Figure 5 This is a schematic diagram of the pouring construction structure in step 5 of the synchronous construction method of the inner lining wall and the outer wall of the diaphragm wall of the present invention.

[0032] In the diagram, 1 is the diaphragm wall, 101 is the first vertical reinforcement, 102 is the second vertical reinforcement, 103 is the stirrup, 104 is the anchorage reinforcement of the diaphragm wall, 2 is the capping beam, 3 is the external structural wall, 301 is the inner vertical reinforcement of the wall, 302 is the outer vertical reinforcement of the wall, 4 is the internal support, 5 is the raft slab, 501 is the top main reinforcement, 502 is the bottom slab anchorage reinforcement, 503 is the bottom main reinforcement, 504 is the waterstop steel plate, 6 is the inner lining wall, 601 is the inner lining wall anchorage reinforcement, 602 is the third vertical reinforcement, 7 is the top slab reinforcement, 8 is the straight threaded sleeve, and 9 is the diaphragm wall in place. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0034] Please see the appendix Figure 1 To be continued Figure 5 A method for simultaneous construction of the diaphragm wall lining and the structural exterior wall includes the following steps:

[0035] Please see the appendix Figure 1 To be continued Figure 3 Step 1: Construction of diaphragm wall 1, including the construction of reinforcing bars and embedded parts of diaphragm wall 1 and the pouring of concrete.

[0036] Please see the appendix Figure 1 and attached Figure 2 In step 1, the reinforcing bars of the diaphragm wall 1 include a first vertical bar 101 close to the main structure, a second vertical bar 102 away from the main structure, and stirrups 103 connected to the first vertical bar 101 and the second vertical bar 102; part of the first vertical bar 101 is extended to below the top surface of the capping beam 2, and part of the second vertical bar 102 is extended to the interior of the outer wall 3 of the structure.

[0037] The steel reinforcement structure of the diaphragm wall 1 is constructed using existing technology. The first vertical bar 101, the second vertical bar 102, and the stirrups 103 can be fixed by welding or binding, which will not be elaborated here.

[0038] The first vertical bar 101 is positioned slightly below the top surface of the capping beam 2 to ensure anchorage strength, thereby forming a strong integral structure between the diaphragm wall 1 and the capping beam 2 and minimizing on-site steel reinforcement welding. The second vertical bar 102 is positioned above the capping beam 2 and extends into the outer wall 3 of the structure to facilitate subsequent extension.

[0039] In step 1, during the construction of the reinforcing bars, the first vertical bar 101 and the second vertical bar 102 are staggered along the length of the wall, which facilitates construction while ensuring structural strength. The number of reinforcing bars 101 and 102 can be adjusted adaptively according to actual construction needs.

[0040] Please see the appendix Figure 3In step 1, the embedded parts include several vertically spaced ground wall anchor bars 104 embedded in the ground wall 1. One end of the several ground wall anchor bars 104 is welded to the first vertical bar 101 and the stirrup 103, and the other end of the several ground wall anchor bars 104 is anchored into the ground wall 1.

[0041] Preferably, the ground wall anchor bar 104 has a Z-shaped structure, which facilitates subsequent connection with steel bars, steel plates, etc., and ensures the anchorage strength of the ground wall anchor bar 104 in the ground diaphragm wall 1. The anchorage depth of the ground wall anchor bar 104 can be adaptively adjusted according to actual construction needs.

[0042] Please see the appendix Figure 3 Step 2: Construction of the capping beam 2 and the inner support 4, including the reinforcement construction and pouring of the capping beam 2 and the inner support 4.

[0043] The construction of the top beam 2 and the inner support 4, including the binding of steel bars, the erection of formwork, and the pouring of concrete, can be carried out using existing technologies, and will not be described in detail here.

[0044] In step 2, the top and bottom surfaces of the capping beam 2 are flush with the top and bottom surfaces of the inner support 4, respectively. One end of the capping beam 2, where it connects to one end of the inner support 4, is flush with the inner side of the diaphragm wall 1. The other end of the capping beam 2 can be connected to the original diaphragm wall 9 located outside the diaphragm wall 1, as shown in the attached diagram. Figure 5 As shown, the other end of the inner support 4 is connected to the main structure.

[0045] The internal support 4 serves as an internal support for the diaphragm wall 1. Once the diaphragm wall 1 and raft slab 5 have reached a certain structural strength and can resist earth pressure, the internal support 4 can be removed. Compared to traditional construction methods, this invention allows for the earlier installation of the internal support 4, improving the safety of the foundation pit construction. The capping beam 2 is located between the structural outer wall 3 and the diaphragm wall 1 and is permanently retained as part of the overall outer wall structure.

[0046] Step 3: Excavation of the foundation pit, removal of soil below 4 internal supports.

[0047] Excavation and soil removal are standard procedures in foundation pit construction, and will not be elaborated here.

[0048] Please see the appendix Figure 3 Step 4: Construction of the reinforcing steel of raft slab 5, and connection of the reinforcing steel of raft slab 5 to the embedded parts of diaphragm wall 1.

[0049] In step 4, at the height of the top main reinforcement 501 of the raft slab 5, one end of the bottom plate anchoring reinforcement 502 is connected to the embedded part at that height, i.e., the ground wall anchoring reinforcement 104, and the other end of the bottom plate anchoring reinforcement 502 is connected to the top main reinforcement 501; at the height of the bottom main reinforcement 503 of the raft slab 5, one end of the waterstop steel plate 504 is connected to the embedded part at that height, i.e., the ground wall anchoring reinforcement 104, and the other end of the waterstop steel plate 504 is connected to the bottom main reinforcement 503.

[0050] When pre-embedding the pre-embedded parts, i.e., the ground wall anchor bars 104, according to the design drawings, the ground wall anchor bars 104 are pre-embedded at the height of the top main bar 501 and the bottom main bar 503 of the raft slab 5, so as to facilitate the connection between the ground wall anchor bars 104 and the top main bar 501 and the bottom main bar 503.

[0051] Remove the concrete protective layer at the corresponding height of the diaphragm wall 1 to expose the wall anchor bar 104. Weld and fix the bottom plate anchor bar 502 to the wall anchor bar 104 and the top main bar 501. Weld and fix the waterstop steel plate 504 to the wall anchor bar 104 and the bottom main bar 503.

[0052] The inner wall surface of the diaphragm wall 1 within the height range of the raft slab 5 is roughened, and concrete for the raft slab 5 is poured, so that the raft slab 5 and the diaphragm wall 1 form an integral whole after pouring, serving as part of the underground structure and capable of resisting earth pressure. The reinforcement binding, formwork erection, and concrete pouring of the raft slab 5 are all carried out using existing processes, and will not be described in detail here.

[0053] Please see the appendix Figure 4 and attached Figure 5 Step 5: Roughen the inner side of the diaphragm wall 1 (i.e. the side facing the main structure), and construct the inner lining wall 6 simultaneously with the floor structure so that the inner lining wall 6, the diaphragm wall 1, and the floor structure form a whole.

[0054] Please see the appendix Figure 4 In step 5, when constructing the top slab reinforcement 7 of the floor structure, the end of the top slab reinforcement 7 near the diaphragm wall 1 is connected to the pre-embedded part of the diaphragm wall 1 at the same height, namely the ground wall anchor bar 104. The inner lining wall 6 is constructed synchronously with the floor structure to the top slab of the structure adjacent to the inner support 4.

[0055] The concrete cover at the corresponding height of the diaphragm wall 1 is removed to expose the wall anchor bars 104. The top slab reinforcement 7 is welded to the wall anchor bars 104. After the top slab reinforcement 7 is constructed, it forms an integral whole with the diaphragm wall 1 and the inner lining wall 6. The reinforcement binding, formwork erection, and concrete pouring of the top slab are all carried out using existing processes, which will not be described in detail here.

[0056] Please see the appendix Figure 5In step 5, an inner lining wall anchor bar 601 is constructed inside the inner lining wall 6. One end of the inner lining wall anchor bar 601 is connected to the pre-embedded part of the ground diaphragm wall 1, namely the ground wall anchor bar 104, and the other end of the inner lining wall anchor bar 601 is anchored inside the inner lining wall 6. The third vertical bar 602 inside the inner lining wall 6 is extended to the outer wall 3 of the structure.

[0057] After the inner lining wall 6 is poured, it forms an integral whole with the diaphragm wall 1 through the roughened surface of the diaphragm wall 1. At the same time, it forms an integral whole with the structural outer wall 3 through the slab reinforcement. The top slab reinforcement 7 penetrates the inner lining wall 6. The floor structure, diaphragm wall 1, structural outer wall 3 and inner lining wall 6 form an integral structure, improving the integrity and structural strength of the entire structure.

[0058] Step 6: Remove inner support 4.

[0059] The internal support 4 was removed using existing conventional methods, which will not be described in detail here.

[0060] Please see the appendix Figure 5 Step 7: Extend the steel bars 602 inside the inner lining wall 6 that are close to the inner side of the outer structural wall 3 to form the inner vertical bar 301 of the wall; extend the steel bars 102 inside the diaphragm wall 1 that are close to the outer side of the outer structural wall 3 to form the outer vertical bar 302 of the wall.

[0061] The reinforcing bars of the diaphragm wall 1 and the inner lining wall 6 are extended to serve as the vertical reinforcing bars of the outer structural wall 3, which not only ensures the integrity of the structure but also facilitates construction.

[0062] Preferably, in step 7, the joints of two adjacent reinforcing bars are coaxially connected by a straight threaded sleeve 8 to ensure the reliability of the joint connection.

[0063] Step 8: Simultaneously pour the inner lining wall 6, the structural outer wall 3, and other vertical structures on the floor where the inner support 4 is located.

[0064] The inner lining wall 6, the structural outer wall 3, and other vertical structures form an integral structure. The structural outer wall 3, located above the inner support 4, is poured simultaneously with the diaphragm wall 1 and the inner lining wall 3, which are located below the inner support 4 but above the top slab on the same floor, to ensure structural integrity and waterproofing quality. The concrete pouring of the inner lining wall 6, the structural outer wall 3, and other vertical structures is carried out using existing conventional processes, which will not be described in detail here.

[0065] In actual construction, other vertical structures include vertical walls, columns, etc. If there are no other vertical structures, the inner lining wall 6 and the outer structural wall 3 of the floor where the inner support 4 is located can be poured simultaneously.

[0066] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the invention. Therefore, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for simultaneous construction of the inner lining wall and the outer structural wall of a diaphragm wall, characterized by: Includes the following steps: Step 1: Construction of diaphragm wall (1), including the construction of reinforcing bars and embedded parts of diaphragm wall (1) and the pouring of concrete; Step 2: Construction of the capping beam (2) and the inner support (4), including the reinforcement construction and pouring construction of the capping beam (2) and the inner support (4); In step 2, the top and bottom surfaces of the capping beam (2) are flush with the top and bottom surfaces of the inner support (4), and the end face of the capping beam (2) connected to the end of the inner support (4) is flush with the inner side of the diaphragm wall (1); the other end of the capping beam (2) is connected to the original diaphragm wall (9) located outside the diaphragm wall (1), and the other end of the inner support (4) is connected to the main structure. Step 3: Excavation of the foundation pit, removal of soil below the internal support (4); Step 4: Construction of the reinforcing steel of the raft slab (5), and connection of the reinforcing steel of the raft slab (5) to the embedded parts of the diaphragm wall (1); In step 4, at the height of the top main reinforcement (501) of the raft slab (5), one end of the bottom plate anchoring reinforcement (502) is connected to the embedded part at that height, and the other end of the bottom plate anchoring reinforcement (502) is connected to the top main reinforcement (501); at the height of the bottom main reinforcement (503) of the raft slab (5), one end of the waterstop steel plate (504) is connected to the embedded part at that height, and the other end of the waterstop steel plate (504) is connected to the bottom main reinforcement (503); After the raft slab (5) is poured, it forms an integral whole with the diaphragm wall (1) as part of the underground structure; Step 5: Roughen the inner surface of the diaphragm wall (1), and construct the inner lining wall (6) simultaneously with the floor structure so that the inner lining wall (6), the diaphragm wall (1), and the floor structure form a whole. In step 5, when constructing the top slab reinforcement (7) of the floor structure, the end of the top slab reinforcement (7) close to the diaphragm wall (1) is connected to the embedded part of the diaphragm wall (1) at the same height. The inner lining wall (6) is constructed synchronously with the floor structure to the top slab of the structure adjacent to the inner support (4). In step 5, an inner lining wall anchor bar (601) is constructed inside the inner lining wall (6). One end of the inner lining wall anchor bar (601) is connected to the embedded part of the diaphragm wall (1), and the other end of the inner lining wall anchor bar (601) is anchored inside the inner lining wall (6). The third vertical bar (602) inside the inner lining wall (6) is extended to the outer wall (3) of the structure. The floor structure, diaphragm wall (1), structural exterior wall (3) and interior lining wall (6) form an integral structure; Step 6: Remove the internal support (4); Step 7: Extend the steel bars inside the inner lining wall (6) that are close to the inner side of the outer structural wall (3) to form the inner vertical reinforcement (301) of the wall; extend the steel bars inside the diaphragm wall (1) that are close to the outer side of the outer structural wall (3) to form the outer vertical reinforcement (302) of the wall. Step 8: Simultaneously pour the inner lining wall (6), structural outer wall (3), and other vertical structures on the floor where the internal support (4) is located; In step 1, the reinforcing bars of the diaphragm wall (1) include a first vertical bar (101) close to the main structure, a second vertical bar (102) away from the main structure, and stirrups (103) connected to the first vertical bar (101) and the second vertical bar (102); part of the first vertical bar (101) is extended to below the top surface of the capping beam (2), and part of the second vertical bar (102) is extended to the outer wall (3) of the structure.

2. The method for simultaneous construction of the inner lining wall and the outer structural wall of the diaphragm wall according to claim 1, characterized in that: In step 1, during the construction of the reinforcing bars, the first vertical bar (101) and the second vertical bar (102) are staggered in the length direction of the wall.

3. The method for simultaneous construction of the inner lining wall and the outer structural wall of the diaphragm wall according to claim 1, characterized in that: In step 1, the embedded parts include several vertically spaced ground wall anchor bars (104) embedded in the ground wall (1). One end of the several ground wall anchor bars (104) is welded to the first vertical bar (101) and the stirrup (103), and the other end of the several ground wall anchor bars (104) is anchored into the ground wall (1).

4. The method for simultaneous construction of the inner lining wall and the outer structural wall of the diaphragm wall according to claim 1, characterized in that: In step 7, the joints of two adjacent steel bars are coaxially connected by a straight threaded sleeve (8).

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