Cold joint treatment method for interface between new and old concrete in concrete shear wall replacement and wall body

Abstract

The application discloses a cold joint treatment method for replacing new and old concrete interfaces in a concrete shear wall and a wall body. By improving the form and construction technology of the construction joint, the conditions for forming the joint cracks are changed, and seamless connection of the wall body replacement concrete is realized. The application changes the single form of the traditional construction joint straight joint, sets a joint blocking key to divide the whole construction joint into several short joints, and prevents the extension of the cracks; the concrete overfilling at the wall top makes all the joint surfaces avoid the uneven area of the concrete caused by the aggregate settlement, before the final setting, the self-weight and construction extrusion force of the overfilled concrete make the concrete interface in a compression state, the new and old concrete connection is more firm, and the integrity is stronger, after the final setting, the expanded section effectively reduces the section stress and reduces the probability of crack generation. The isolation film is pasted around the original wall plate at the pouring hole, the contact between the cast-in-place concrete and the original component is successfully cut off, the pollution of the post-cast concrete to the original component is avoided, and the difficulty of removing the excess concrete in the later period is reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of building reinforcement, in particular to a cold joint treatment method for new and old concrete interfaces in concrete shear wall replacement and a wall body. BACKGROUND

[0002] In the construction process of a high-rise concrete shear wall structure, when the actual strength of the shear wall concrete is lower than the design strength requirement, the safety of the structure is affected, so structural reinforcement must be carried out to meet the bearing capacity requirement of the structure; common reinforcement methods include the steel bonding reinforcement method, the section enlargement method and the concrete replacement method. When the concrete strength is much lower than the original design strength, the concrete replacement method becomes the best choice and is a reinforcement method most applied in engineering.

[0003] The concrete replacement method is a method for replacing the unqualified concrete of an existing wall body with concrete meeting the design requirement, and the new and old concrete is bonded into an integral whole in the cement hydration process, the new and old concrete cooperates, the performance is basically the same as that of a once-poured component, and the appearance of the component is not changed.

[0004] When the wall body concrete is replaced, at least two horizontal edges and one or two vertical edges of each new wall body are in contact with the original wall body, and a construction cold joint exists at the interface where the new wall body and the original wall body are combined. Whether the construction cold joint is properly treated not only affects the construction progress and process arrangement, but also determines whether the new and old concrete at the combined surface can be effectively and firmly bonded and connected into an integral whole to achieve the purpose of cooperation.

[0005] In view of the related art, the traditional construction joint treatment adopts a combined use of an interface agent and a wedge-shaped groove filled with concrete. This treatment method causes cracks to easily form at the combined surface, the cracks are prone to extend in two directions to form through cracks, the concrete at the upper opening of the wedge-shaped groove is not easy to be vibrated and compacted when the wedge-shaped groove is filled with concrete, and the excess concrete needs to be chipped off in the later period. Construction vibration easily causes new cracks at the combined surface, the treatment trace is obvious, and the work and time are wasted. SUMMARY

[0006] In order to help realize seamless connection of new and old concrete in the concrete wall replacement process, improve the integrity of the concrete shear wall and reduce the processing workload of the combined surface in the later period, the application provides a cold joint treatment method for new and old concrete interfaces in concrete shear wall replacement and a wall body.

[0007] The cold joint treatment method for new and old concrete interfaces in concrete shear wall replacement provided by the application adopts the following technical scheme:

[0008] First aspect

[0009] A cold joint treatment method for new and old concrete interfaces in concrete shear wall replacement comprises the following steps:

[0010] Dig the batch to be replaced wall concrete, retaining the original wall steel, forming a hole, dig through the local floor on the side of the batch to be replaced wall, forming a pouring hole;

[0011] Sawtooth interface is arranged at the joint surface of new and old concrete to form a tooth surface, and the joint surface of new and old concrete is cleaned;

[0012] The key groove is formed at the joint surface of new and old concrete by pre-burying or digging;

[0013] The shear pin pre-buried in the previous batch of replacement wall is straightened to connect the previous batch of replacement wall and the current batch of replacement wall through the shear pin, and the shear pin is implanted at the top of the lower shear wall and the bottom of the upper shear wall to pre-bury the shear pin between the current batch of replacement wall and the next batch of replacement wall;

[0014] The formwork is supported, and the key block embedded between the current batch of replacement wall and the next batch of replacement wall and the metal tooth plate are installed between the formworks;

[0015] The isolation film is pasted on the side surface of the upper shear wall and the upper surface of the floor around the pouring hole;

[0016] The hole wall concrete is poured through the pouring hole, the new poured concrete exceeds the upper surface of the floor by a certain height, so that the replacement part of the concrete is in a compression state throughout, and the over-poured concrete is separated from the side surface of the upper shear wall and the upper surface of the floor by the isolation film; the new poured concrete is solidified in the key groove to form a key, and the key separates the construction joint into multiple short joints;

[0017] Under the action of self-weight pressure, the new poured concrete is combined with the walls around the hole and the floor to form an integral whole, and after the new poured concrete reaches the preset strength, the over-poured concrete is cut off.

[0018] By adopting the technical scheme, the construction joint is divided into multiple short joints by setting the block joints at intervals on the new and old concrete joint surface, the traditional straight joint form is changed, and the crack propagation is prevented; the aggregate sinking speed caused by the concrete vibration is greater than the mortar sinking speed, the uppermost concrete is thick pure mortar, the strength is low, and the shrinkage is large, the overfilling concrete avoids the concrete uneven area caused by the aggregate sinking on all joint surfaces, before the final setting, the overfilling concrete self weight and construction extrusion force make the concrete interface in a compression state, the concrete compactness is enhanced, the shrinkage tensile stress caused by the concrete hydration is reduced, the new and old concrete connection is more firm, the overall performance is stronger, after the final setting, the expanded section effectively reduces the section shrinkage stress and the crack generation probability; the isolation film is pasted around the pouring hole, the original structure member is prevented from being polluted, the excess concrete is easier to remove in the later period, the influence of the chiseling vibration on the joint surface is reduced, and the interface does not need to be treated. The application changes the crack formation condition of the joint surface by improving the construction joint form and the construction process, the bonding strength and the shear capacity of the new and old concrete joint surface are enhanced, the seamless connection of the wall replacement concrete is realized, the overall performance of the shear wall is improved, the post-cast concrete successfully replaces the original concrete, the surface is smooth, and the later treatment work is less. The application has obvious advantages in construction feasibility, operability and construction quality, and has the advantages of structural safety, firmness, convenient construction and the like.

[0019] Optionally, the interval between adjacent block joints is 300-500 mm.

[0020] By adopting the technical scheme, the crack propagation can be effectively reduced in the distance range, and the construction cost is reduced by avoiding excessive setting of the block joint groove.

[0021] Optionally, the groove width and groove depth of the block joint groove are (30-50) mm*50 mm.

[0022] By adopting the technical scheme, the crack propagation is prevented, and the contact area of the new and old concrete joint surface is increased, and then the bonding strength of the new and old concrete joint surface is improved.

[0023] Optionally, before the formwork plate, the concrete wall within a range of 500 mm around the hole is fully watered and moistened, the moistening degree is preferably that the original concrete does not absorb the water of the newly cast concrete, and the new and old concrete joint surface is brushed with the same strength cement mortar when the concrete is cast.

[0024] By adopting the technical scheme, fully moistening the surface of the original concrete can increase the bonding strength of the newly cast concrete and the original concrete. The improvement of the bonding strength helps to ensure that the new and old concrete can work better in use, and reduces the possible cracking and peeling problems.

[0025] Optionally, the overfilling concrete is 400-500 mm higher than the upper surface of the floor slab.

[0026] By adopting the technical scheme, the overfilling part has sufficient self-weight, the whole replacement part of concrete is in a compression state under the action of the self-weight pressure, the compactness of the concrete is enhanced, the shrinkage tensile stress generated by the hydration of the concrete is reduced, the connection between the new and old concrete is more firm, and the integrity is stronger.

[0027] Optionally, the sawtooth interface is a transverse line sawtooth interface with a groove depth of 5.5-6.5 mm and a spacing of 50-100 mm perpendicular to the wall surface.

[0028] Optionally, the shear pin comprises an anchoring segment and a pre-buried segment, the anchoring segment is in the shape of Г and is anchored in the previous batch of replacement wall or the current batch of replacement wall, and the pre-buried segment and the anchoring segment are bent from one reinforcing bar, the pre-buried segment is attached to the surface of the new and old concrete joint surface when in the pre-buried stage, and the pre-buried segment is straightened to be away from the surface of the new and old concrete joint surface before pouring concrete into the hole.

[0029] By adopting the technical scheme, the shear pin can be pre-buried in the previous batch of replacement wall, does not affect the removal of the original wall, and can be quickly straightened to realize seamless connection between the adjacent two walls after pouring new concrete.

[0030] Optionally, the overfilling concrete is compacted and lightened before final setting of the new poured concrete.

[0031] By adopting the technical scheme, the compactness of the new poured concrete can be further improved, the impermeability can be improved, and the overall strength and hardness of the current batch of replacement wall can be improved.

[0032] Optionally, the new poured concrete is micro-expansive concrete, the aggregate diameter is not greater than 30 mm, and the strength grade of the new poured concrete is one grade higher than the original design.

[0033] By adopting the technical scheme, the new poured concrete replaces the original concrete, and the strength grade is one grade higher than the original design, thereby guaranteeing the quality of the subsequent replacement wall and making the structure safer and more reliable.

[0034] The second aspect

[0035] A wall formed based on the method for cold joint treatment of a new and old concrete interface in concrete shear wall replacement, comprising:

[0036] a previous batch of replacement wall, a current batch of replacement wall, a next batch of replacement wall to be replaced, a new and old concrete joint surface, a sawtooth interface, a joint blocking key, a joint blocking key embedded part, a shear pin, an isolation film, and overfilling concrete.

[0037] The previous batch of replacement wall, the current batch of replacement wall, and the next batch of replacement wall to be replaced are arranged in sequence according to the construction sequence.

[0038] The sawtooth interface, the blocking key and the shear pin are arranged at the new and old concrete joint surface;

[0039] The blocking key embedded part is embedded between the current batch of replacement wall and the next batch of wall to be replaced;

[0040] The isolation film is pasted on the side surface of the upper shear wall and the upper surface of the floor, and the over-poured concrete is separated from the side surface of the upper shear wall and the upper surface of the floor by the isolation film.

[0041] In summary, the present application includes at least one of the following beneficial technical effects:

[0042] 1. The blocking key is arranged at the new and old concrete joint surface every certain distance to divide the construction joint into multiple short joints, change the traditional straight joint form, and prevent the crack from extending; the concrete vibration causes the aggregate sinking speed to be greater than the mortar sinking speed, resulting in thick pure mortar at the uppermost part of the concrete, low strength and large shrinkage; the over-poured concrete at the top of the wall avoids the concrete uneven area caused by the aggregate sinking, and before the final setting, the over-poured concrete self-weight and construction extrusion force make the concrete interface in a compression state, enhance the concrete compactness, reduce the shrinkage tensile stress generated by the concrete hydration, make the new and old concrete connection more firm, and the overall performance stronger; after the final setting, the expanded cross section effectively reduces the cross section shrinkage stress and reduces the probability of crack generation; the isolation film is pasted around the pouring hole to prevent the original structure member from being polluted, the later removal of the excess concrete is easier, the influence of the chiseling vibration on the joint surface is reduced, and the interface does not need to be treated.

[0043] 2. The present application changes the conditions for forming the joint surface crack by improving the construction joint form and the construction process, enhances the bonding force of the new and old concrete joint surface, realizes the seamless connection of the concrete for wall replacement, improves the overall performance of the shear wall, successfully replaces the original concrete with the post-cast concrete, and has a smooth surface and less post-treatment work. The present application has obvious advantages in construction feasibility, operability and construction quality, and has the advantages of structural safety and reliability, convenient construction, etc.

[0044] 3. The new and old concrete joint surface of the replacement wall of the present application is firmly connected, has strong overall performance, a smooth appearance, poor distinction of wall replacement traces, and small wall surface pollution. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 is the wall concrete replacement elevation view of the embodiment of the present application.

[0046] Figure 2 is the wall concrete replacement process side view of the embodiment of the present application.

[0047] Figure 3 is the blocking key embedded part schematic view of the embodiment of the present application.

[0048] Figure 4 is Figure 1 is an enlarged schematic view of part A in figure 1.

[0049] Figure 5 is a state transition schematic diagram of the shear pin in the embodiment of the application.

[0050] Figure 6 is a detailed view of the isolation film around the perfusion hole in the embodiment of the application.

[0051] Explanation of reference signs:

[0052] 1, lower shear wall; 2, upper shear wall; 3, floor slab; 4, isolation film on wall; 5, isolation film on slab surface; 6, previous batch of replacement wall; 7, current batch of replacement wall; 8, next batch of wall to be replaced; 9, serrated interface; 10, new wall blocking key; 11, blocking key embedded part; 12, original wall blocking key; 13, shear pin; 131, anchoring section; 132, pre-embedded section; 14, shear pin; 15, horizontal distribution bar; 16, vertical distribution bar; 17, formwork; 18, perfusion hole; 19, over-perfused concrete. DETAILED DESCRIPTION

[0053] The following will be described in detail with reference to the accompanying drawings. Figures 1-6 The application will be described in further detail.

[0054] Reference will be made to Figure 1 , from bottom to top, a lower shear wall 1, a replacement floor, and an upper shear wall 2 are sequentially arranged, and the replacement floor is separated from the lower shear wall 1 and the upper shear wall 2 by a floor slab 3. In the embodiment of the application, the wall of the replacement floor is mainly replaced in sections, and the replacement floor is divided into a previous batch of replacement wall 6, a current batch of replacement wall 7, and a next batch of wall to be replaced 8 by sectional construction.

[0055] The application discloses a cold joint treatment method for the interface between new and old concrete in replacement of a concrete shear wall.

[0056] The cold joint treatment method comprises the following steps:

[0057] Reference will be made to Figure 1 and Figure 2 , S1, the concrete of the current batch of wall to be replaced is chiseled off, the original steel bars in the wall are retained, a hole is formed, and the local floor slab 3 above the side of the current batch of wall to be replaced is chiseled through to form a perfusion hole 18.

[0058] Specifically, the wall to be replaced in the batch is chiseled, that is, the wall at the position of the wall to be replaced in the batch 7 is chiseled, and the two sides of the wall are penetrated, at the same time, the wall is chiseled down to the upper surface of the floor 3, and up through the floor 3 to the lower surface of the upper shear wall 2, forming a hole. Then, the local floor 3 above the side of the wall to be replaced in the batch is chiseled to form a pouring hole 18, which communicates with the hole.

[0059] At the same time, the steel bars include horizontal distribution bars 15 and vertical distribution bars 16 which are crisscrossed, and the horizontal distribution bars 15 and the vertical distribution bars 16 are fixed by binding or welding.

[0060] S2, a serrated interface 9 is arranged at the new and old concrete joint surface to form a tooth surface, and the new and old concrete joint surface is cleaned.

[0061] Specifically, the serrated interface 9 can be formed by pre-embedding a metal tooth plate or by chiseling.

[0062] By pre-embedding a metal tooth plate, a metal tooth plate can be pre-embedded between the wall to be replaced in the previous batch 6 and the wall to be replaced in the batch 7, and the tooth surface can be formed by removing the metal tooth plate when the wall to be replaced in the batch 7 is constructed.

[0063] By chiseling, the old concrete surface of the new and old concrete joint surface is chiseled into a serrated interface 9. The serrated interface 9 is a horizontal line with a groove depth of 5.5-6.5mm perpendicular to the wall surface, and a spacing of 50-100mm.

[0064] Specifically, the upper surface of the floor 3 above the lower shear wall 1 is chiseled into a serrated interface 9, and the lower surface of the upper shear wall 2 is chiseled into a serrated interface 9.

[0065] After chiseling the serrated interface 9, the serrated interface 9 is washed clean with high-pressure water, and the new and old concrete joint surface should be exposed to fresh aggregate.

[0066] S3, a blocking key groove is formed at the new and old concrete joint surface by pre-embedding or chiseling.

[0067] Specifically, the blocking key embedded part 11 in the new and old concrete joint surface between the wall to be replaced in the previous batch 6 and the wall to be replaced in the batch 7 is removed to form a blocking key groove; the new and old concrete joint surface between the wall to be replaced in the batch 7 and the floor 3 above the lower shear wall 1, and the new and old concrete joint surface between the wall to be replaced in the batch 7 and the lower surface of the upper shear wall 2 are chiseled to form a blocking key groove.

[0068] Further, when the wall to be replaced in the previous batch 6 is constructed, the blocking key embedded part 11 is pre-embedded, and the structure of the blocking key embedded part 11 is as follows Figure 3As shown, when the wall 7 of the batch is constructed, the key block embedded part 11 is removed to form a key block groove, the key block groove extends along the horizontal direction and penetrates through the two surfaces of the wall, the subsequently poured concrete solidifies at the key block groove to form a new wall key block 10, the new wall key block 10 divides the construction joint into multiple short joints, which can prevent the extension of the cracks.

[0069] Referring to Figure 1 , the adjacent key block grooves are spaced apart by 300-500 mm, the width and depth of the groove bottom of the key block groove are (30-50) mm*50 mm, in the embodiment, the width and depth of the groove bottom of the key block groove are 30 mm*50 mm, the cross section of the key block groove along the vertical direction is in the shape of an expanded mouth, and the side of the key block groove with a larger expanded mouth size faces the wall 7 of the batch, so as to facilitate the subsequent removal of the key block embedded part 11 of the key block groove.

[0070] The new and old concrete joint surface of the lower surface of the upper shear wall 2 and the new and old concrete joint surface of the upper surface of the floor 3 above the lower shear wall 1 are also provided with key block grooves, and the key block grooves are mainly formed by chiseling. The subsequently poured concrete solidifies at the key block groove to form a key block 12 on the original wall.

[0071] S4, referring to Figure 1 and Figure 4 , the shear pin 13 embedded in the wall 6 of the previous batch is straightened to connect the wall 6 of the previous batch and the wall 7 of the batch across the joint. At the same time, the shear pin 13 is implanted at the top of the lower shear wall 1 and the bottom of the upper shear wall 2, and the shear pin 13 between the wall 7 of the batch and the wall 8 of the next batch to be replaced is also embedded.

[0072] Specifically, referring to Figure 1 and Figure 4 , the shear pin 13 across the joint is embedded when the wall 6 of the previous batch is constructed. The shear pin 13 is in the shape of Г, and the shear pin 13 includes an anchoring segment 131 and an embedded segment 132. The anchoring segment 131 is in the shape of Г and is embedded in the wall 6 of the previous batch, and the embedded segment 132 is bent from the anchoring segment 131.

[0073] Referring to Figure 1 and Figure 5 , when in the embedded stage, the anchoring segment 131 is anchored in the wall 6 of the previous batch, and the embedded segment 132 is attached to the surface of the new and old concrete joint surface. Before pouring the concrete into the hole 71, the embedded segment 132 is straightened to make the embedded segment 132 away from the surface of the new and old concrete joint surface and upwardly bent to make the shear pin 13 into a structure with one end extending downwardly and the other end extending upwardly.

[0074] The diameter of the shear pin 13 is 10 mm, the anchoring depth of the shear pin 13 is 150 mm, the bidirectional spacing is not greater than 300 mm, the edge distance is greater than 70 mm, the shear pin 13 is a threaded steel bar, the diameter of the threaded steel bar is 10 mm, and the tensile strength is 300 MPa. After the replacement wall 7 in the batch is formed, the serrated interface 9 and the shear pin 13 are used in combination, so that the bonding force of the new and old concrete combined surface is strengthened, and the integrity of the concrete shear wall is improved.

[0075] Referring to Figure 1 The shear pin 14 is also implanted at the bottom of the upper shear wall 2 and the floor 3 above the lower shear wall 1. Meanwhile, when the steel bars are bound at the hole 71, the shear pin 13 between the replacement wall 7 in the batch and the replacement wall 8 in the next batch is fixed by being bound or welded with the steel bars in advance.

[0076] S5, referring to Figure 1 and Figure 2 The formwork 17 is installed between the formworks 17, and the blocking key embedded part 11 and the metal tooth plate between the replacement wall 7 in the batch and the replacement wall 8 in the next batch are installed.

[0077] Optionally, before the formwork 17, the concrete wall within a range of 500 mm around the hole 71 is fully watered, and the watering degree is appropriate to make the original concrete not absorb the moisture of the newly poured concrete. When the concrete is poured, the new and old concrete combined surface is brushed with a cement mortar of the same strength.

[0078] Specifically, the formwork 17 is arranged around the hole 71, and the blocking key embedded part 11 and the metal tooth plate are installed between the opposite formworks 17, and the blocking key embedded part 11 and the metal tooth plate are located between the replacement wall 7 in the batch and the replacement wall 8 in the next batch, so that the blocking key embedded part 11 and the metal tooth plate are removed after the replacement wall 8 in the next batch is removed.

[0079] S6, the isolation film is pasted on the side surface of the upper shear wall 2 and the upper surface of the floor 3 around the pouring hole 18.

[0080] Specifically, referring to Figure 1 and Figure 2 In the embodiment, the isolation film includes the wall isolation film 4 and the plate surface isolation film 5, the wall isolation film 4 is pasted on the side surface of the upper shear wall 2, and the plate surface isolation film 5 is pasted on the upper surface of the floor 3. The isolation film can prevent the original structure from being polluted, the removal of the excess concrete is easier, the influence of the chiseling vibration on the combined surface is reduced, and the interface does not need to be treated.

[0081] Referring to Figure 1 and Figure 6In a preferred embodiment, the height of the wall isolation film 4 beyond the pouring hole 18 is 500 mm, and the width of the wall isolation film 4 beyond the edge of the pouring hole 18 is 300 mm; the width of the floor isolation film 5 beyond the edge of the pouring hole 18 is 300 mm.

[0082] S7, pouring the hole wall concrete through the pouring hole 18, and forming the over-poured concrete 19 by pouring the new concrete to a certain height beyond the upper surface of the floor 3, so that the over-poured concrete 19 is in compression state throughout the replacement part, and the over-poured concrete 19 is separated from the side surface of the upper shear wall 2 and the upper surface of the floor 3 by the isolation film.

[0083] Specifically, the new concrete is micro-expansion concrete, and the aggregate diameter is not greater than 30 mm, and the strength grade of the new concrete is one grade higher than the original design strength grade.

[0084] The new concrete is over-poured, and the over-poured concrete 19 is 400-500 mm higher than the upper surface of the floor 3. In a preferred embodiment, the over-poured concrete 19 is 400 mm higher than the upper surface of the floor 3, and the width of the over-poured concrete 19 beyond the edge of the pouring hole 18 is 150 mm. The over-poured concrete 19 avoids the uneven area of the concrete caused by the aggregate settlement of all the bonding surfaces, and before the final setting, the self-weight and construction extrusion force of the over-poured concrete 19 make the concrete interface in compression state, so that the new and old concrete are more firmly connected, and the integrity is stronger. After the final setting, the expanded cross section effectively reduces the cross section stress and reduces the probability of crack generation.

[0085] In addition, the over-poured concrete 19 is compacted and lighted once before the final setting of the new concrete.

[0086] S8, under the action of the self-weight pressure, the new concrete is combined with the walls around the hole and the upper surface of the floor 3 to form the replacement wall 7 of this batch, and the over-poured concrete 19 is cut off after the new concrete reaches the preset strength.

[0087] Due to the arrangement of the isolation film, the removal of the excess concrete is easier in the later stage, the influence of the chiseling vibration on the bonding surface is reduced, and the interface does not need to be treated.

[0088] The replacement wall of the application has the advantages of firm bonding surface connection, strong integrity, smooth appearance, poor distinction of wall replacement trace, small wall surface pollution, convenient construction, obvious advantages in construction feasibility, operability, construction quality and efficiency, and the like.

[0089] The processing method of the application realizes the seamless connection of the new and old concrete in the concrete wall replacement process, improves the integrity of the concrete shear wall, and successfully replaces the original structure; compared with the traditional construction joint structure, the application has obvious advantages in construction feasibility, operability, and construction quality, and has the advantages of reliable connection, smooth appearance, and the like.

[0090] The embodiment of the application further discloses a wall formed based on the cold joint treatment method for the interface between the new and old concrete in the concrete shear wall replacement Figure 1 The wall comprises a previous batch of replacement wall 6, a current batch of replacement wall 7, a next batch of wall to be replaced 8, a new and old concrete joint surface, a zigzag interface 9, a new wall joint blocking key 10, an original wall joint blocking key 12, a joint blocking key embedded part 11, a shear pin 13, an isolation film and over-poured concrete 19.

[0091] The previous batch of replacement wall 6, the current batch of replacement wall 7 and the next batch of wall to be replaced 8 are sequentially divided along the construction sequence.

[0092] The new and old concrete joint surface is arranged between the previous batch of replacement wall 6 and the current batch of replacement wall 7, and between the current batch of replacement wall 7 and the floor 3 above the lower shear wall 1 and between the current batch of replacement wall 7 and the upper shear wall 2.

[0093] The zigzag interface 9, the new wall joint blocking key 10, the original wall joint blocking key 12 and the shear pin 13 are arranged on the new and old concrete joint surface. The joint blocking key embedded part 11 is embedded between the current batch of replacement wall 7 and the next batch of wall to be replaced 8.

[0094] The isolation film comprises a wall isolation film 4 attached to the side of the upper shear wall 2 and a board surface isolation film 5 attached to the upper surface of the floor 3, and the over-poured concrete 19 is separated from the side of the upper shear wall 2 and the upper surface of the floor 3 by the isolation film.

[0095] The above are preferred embodiments of the application, and do not limit the protection scope of the application, so: any equivalent changes made on the basis of the structure, shape, principle of the application should be covered within the protection scope of the application.

Claims

1. A cold joint treatment method for replacing a concrete shear wall between old and new concrete interfaces, characterized by, The method comprises the following steps: The steps include: The steps include: The steps include: The steps include: The steps include: The steps include: The steps include: The steps include:

2. The cold-seam treatment method for the interface between new and old concrete in the replacement of a concrete shear wall according to claim 1, characterized in that, The steps include:

3. The cold joint treatment method for replacing the concrete shear wall according to claim 1 or 2, characterized in that, The steps include:

4. The method for cold joint treatment of new and old concrete interface in concrete shear wall replacement according to claim 1, characterized in that: The steps include:

5. The method for cold joint treatment of new and old concrete interface in concrete shear wall replacement according to claim 1, characterized in that: The steps include:

6. The method for cold joint treatment of new and old concrete interface in concrete shear wall replacement according to claim 1, characterized in that: The steps include:

7. The method for cold joint treatment of new and old concrete interface in concrete shear wall replacement according to claim 1, characterized in that: The steps include:

8. 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The method for cold joint treatment of new and old concrete interface in concrete shear wall replacement according to claim 1, characterized in that: The new cast concrete is micro-expansion concrete, the aggregate diameter is not greater than 30 mm, and the strength grade of the new cast concrete is higher than that of the original design by one level.

10. A wall formed by the cold joint treatment method at the interface between new and old concrete for replacing the concrete shear wall according to any one of claims 1-9, comprising a previous batch of replacement wall (6), a current batch of replacement wall (7), a next batch of wall to be replaced (8), a new and old concrete joint surface, a serrated interface (9), a joint blocking key, a joint blocking key embedded part (11), a shear pin (13), a separation film, and over-poured concrete (19); The previous batch of replacement wall (6), the current batch of replacement wall (7), and the next batch of wall to be replaced (8) are sequentially divided in the construction order; The serrated interface (9), the joint blocking key, and the shear pin (13) are arranged at the new and old concrete joint surface; The joint blocking key embedded part (11) is embedded between the current batch of replacement wall (7) and the next batch of wall to be replaced (8); The separation film is attached to the side surface of the upper shear wall (2) and the upper surface of the floor (3), and the over-poured concrete (19) is separated from the side surface of the upper shear wall (2) and the upper surface of the floor (3) by the separation film.

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