Concrete vertical member replacement method and replacement structure

Abstract

The present invention relates to a replacement method for a concrete vertical member and a replacement structure thereof, which is used to replace an original vertical member supported between an upper horizontal member and a lower horizontal member with a new vertical member, and the method comprises the following steps: at least one supporting structure is arranged close to the original vertical member and supported between the upper horizontal member and the lower horizontal member; the original vertical member is removed; high-expansion concrete is poured in sections on the lower horizontal member to form a new vertical member whose top is connected to the upper horizontal member, and a pier is buried in the new vertical member, which can adaptively adjust the axial force of the new vertical member according to the expansion and contraction of the high-expansion concrete; and the supporting structure is removed. The present invention can solve the problem in the prior art that it is difficult to control the axial force balance of the new vertical member when replacing a concrete vertical member by adjusting and controlling the axial force of the new vertical member through high-expansion concrete and the pier.

Description

Technical Field

[0001] The invention relates to the field of building construction, in particular to a replacement method for a concrete vertical component and a replacement structure thereof. Background Art

[0002] In the field of construction, when the strength of the concrete vertical components of a structure differs greatly from the design requirements due to quality problems, the concrete vertical components need to be dismantled and new concrete vertical components need to be rebuilt for replacement.

[0003] See also Figure 1 and Figure 2 , showing a schematic diagram of the replacement steps of the concrete vertical member in the prior art. Figure 1 and Figure 2 As shown, first, a support system 2 is set up around the original concrete vertical member 1 to ensure the overall stability of the structure during replacement, then the original concrete vertical member 1 is chiseled out, and finally a new concrete vertical member 3 is recast. Because concrete has shrinkage, expansive concrete (with expansion agent added) is generally used, which has high early strength and expansibility, and can offset concrete shrinkage. However, the expansion rate of concrete varies widely. Therefore, during the concrete hardening process, when the concrete deformation is inconsistent with the initial state, adverse additional internal forces will be generated in the surrounding structure, especially when the stiffness of the surrounding horizontal members is large, the influence of the above additional internal forces is more obvious. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a method for replacing a concrete vertical member and a replacement structure thereof, so as to solve the problem in the prior art that it is difficult to control the axial force balance of the new vertical member when replacing the concrete vertical member.

[0005] The technical solution to achieve the above purpose is:

[0006] The present invention provides a method for replacing a concrete vertical member, which is used to replace an original vertical member supported between an upper horizontal member and a lower horizontal member with a new vertical member. The replacement method comprises the following steps:

[0007] At least one supporting structure disposed close to the original vertical member and supported between the upper horizontal member and the lower horizontal member;

[0008] Remove the original vertical components;

[0009] Casting high-expansion concrete in sections on the lower horizontal member to form a new vertical member whose top is connected to the upper horizontal member, and burying in the new vertical member a buttress capable of adaptively adjusting the axial force of the new vertical member according to the expansion and contraction of the high-expansion concrete; and

[0010] The support structure is removed.

[0011] A further improvement of the method for replacing a concrete vertical member of the present invention is that high-expansion concrete is poured in sections on the lower horizontal member to form a new vertical member whose top is connected to the upper horizontal member, and a pier that can adaptively adjust the axial force according to the deformation of the high-expansion concrete is buried in the new vertical member, comprising:

[0012] pouring the high expansion concrete on the lower horizontal member to form a lower section;

[0013] Providing buttresses, and arranging the buttresses on the lower section;

[0014] pouring the high expansion concrete on the pier to form an upper section;

[0015] Low expansion concrete is poured between the upper section and the lower section to form a middle section covering the pier.

[0016] A further improvement of the method for replacing a concrete vertical member of the present invention is that:

[0017] Providing buttresses, including providing buckling restrained bearings with a yield force equal to the initial axial force of the original vertical member.

[0018] A further improvement of the method for replacing a concrete vertical member of the present invention is that providing a buckling restrained support comprises:

[0019] Providing a sleeve and a core plate, and inserting the core plate into the sleeve;

[0020] An upper connecting plate and a lower connecting plate are provided, the lower connecting plate is fixedly connected to the bottom of the sleeve, the lower connecting plate is connected to the lower section, the upper connecting plate is fixedly connected to the core plate, and the upper connecting plate is connected to the upper section.

[0021] A further improvement of the method for replacing a concrete vertical member of the present invention is that:

[0022] The height of the support structure is adjustable;

[0023] Before removing the original vertical member, the method further includes: adjusting the height of the support structure so that the axial force of the original vertical member is reduced to zero.

[0024] A further improvement of the method for replacing a concrete vertical member of the present invention is that the supporting structure is provided, comprising:

[0025] Providing a jack, and placing the jack on the lower horizontal member;

[0026] A support column with a height less than the distance between the upper horizontal member and the lower horizontal member is provided, and the support column is erected on the jack, with the top of the support column supported by the bottom of the upper horizontal member.

[0027] The present invention also provides a replacement structure of a concrete vertical member, comprising:

[0028] A new vertical member is cast in sections on the lower horizontal member by high expansion concrete, and the top of the new vertical member is connected to the upper horizontal member;

[0029] A buttress is embedded in the new vertical member and can adaptively adjust the axial force of the new vertical member according to the expansion and contraction of the high-expansion concrete.

[0030] A further improvement of the replacement structure of the concrete vertical member of the present invention is that the new vertical member comprises:

[0031] A lower section is formed on the lower horizontal member by pouring the high expansion concrete, and the pier is arranged on the lower section;

[0032] An upper section formed on the pier by pouring the high expansion concrete;

[0033] A middle section covering the pier is formed by pouring low expansion concrete between the upper section and the lower section.

[0034] A further improvement of the method for replacing a concrete vertical member of the present invention is that the buttress is a buckling restrained bearing having a yield force equal to the initial axial force of the original vertical member.

[0035] A further improvement of the method for replacing a concrete vertical member of the present invention is that the buckling restraint support comprises:

[0036] A sleeve and a core plate inserted in the sleeve;

[0037] A lower connecting plate fixedly connected to the bottom of the sleeve, the lower connecting plate is connected to the lower section, and an upper connecting plate fixedly connected to the core plate, the upper connecting plate is connected to the upper section.

[0038] Beneficial effects of the replacement method of the concrete vertical member and the replacement structure thereof of the present invention:

[0039] The present invention forms a new vertical member by casting high-expansion concrete. The high-expansion concrete expands during the solidification process and squeezes the pier. When the internal force of the pier reaches the yield stress, it basically stops increasing and no additional axial force is generated on the upper horizontal member and the lower horizontal member. After the pier yields, it continues to be squeezed by the high-expansion concrete to produce plastic deformation. In the later stage of construction, the high-expansion concrete shrinks. Since the shrinkage deformation of the high-expansion concrete is designed to be within the plastic deformation range of the pier, the pier is still in a yielded state. The present invention controls the axial force of the new vertical member by adjusting the high-expansion concrete and the pier, which can solve the problem of difficulty in controlling the axial force balance of the new vertical member when replacing the concrete vertical member in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 and Figure 2 It is a schematic diagram of the replacement steps of concrete vertical components in the prior art.

[0041] Figure 3 , Figure 4 and Figure 5 It is a schematic diagram of the steps of the method for replacing a concrete vertical member of the present invention.

[0042] Figure 6 A schematic diagram of a buckling restrained support for a replacement method for a concrete vertical member of the present invention.

[0043] Figure 7 for Figure 6 Cross-sectional view in the AA direction. DETAILED DESCRIPTION

[0044] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0045] See Figure Figure 3 , Figure 4 and Figure 5 The following is a schematic diagram showing the steps of the replacement method of the concrete vertical member of the present invention. Figures 3 to 5 As shown, the replacement method of the concrete vertical member of the present invention is used to replace the original vertical member supported between the upper horizontal member and the lower horizontal member with a new vertical member, and the replacement method comprises the following steps:

[0046] At least one supporting structure 20 is arranged near the original vertical member 10 and supported between the upper horizontal member 11 and the lower horizontal member 12;

[0047] Dismantle the original vertical member 10;

[0048] Casting high-expansion concrete in sections on the lower horizontal member 12 to form a new vertical member 30 whose top is connected to the upper horizontal member 11, and burying a buttress 40 in the new vertical member 30 to adaptively adjust the axial force of the new vertical member 30 according to the expansion and contraction of the high-expansion concrete; and

[0049] The support structure 20 is removed.

[0050] As a preferred embodiment of the method for replacing a concrete vertical member of the present invention, the height of the support structure 20 is adjustable; before removing the original vertical member 10, the method also includes: adjusting the height of the support structure 20 so that the axial force of the original vertical member 10 is reduced to zero.

[0051] Specifically, the internal force that coincides with the axis of the original vertical member and other rods is called the axial force. When the height of the support structure supported between the upper horizontal member and the lower horizontal member is adjusted, and the axial force of the original vertical member is measured to gradually decrease to zero, it means that the force between the upper horizontal member and the lower horizontal member is borne by the support structure at this time, and the original vertical member can be removed without affecting the structure of the upper horizontal member and the lower horizontal member.

[0052] As a preferred embodiment of the method for replacing the concrete vertical member of the present invention, a support structure 20 is provided, comprising:

[0053] Providing a jack 22, and placing the jack 22 on the lower horizontal member 12;

[0054] A support column 21 having a height less than the distance between the upper horizontal member 11 and the lower horizontal member 12 is provided, and the support column 21 is erected on the jack 22 , with the top of the support column 21 supported by the bottom of the upper horizontal member 11 .

[0055] The jack is a light and small lifting device that uses a rigid lifting member as a working device and lifts heavy objects within the stroke through the top support seat or the bottom support claw. By adjusting the jack's top rod to support the bottom of the support column 21, the support structure as a whole bears the force between the upper horizontal member and the lower horizontal member to ensure that the structure of the upper horizontal member and the lower horizontal member is not affected when the original vertical member is removed.

[0056] As a preferred embodiment of the method for replacing a concrete vertical member of the present invention, high expansion concrete is poured in sections on the lower horizontal member 12 to form a new vertical member 30 whose top is connected to the upper horizontal member 11, and a pier 40 capable of adaptively adjusting the axial force according to the deformation of the high expansion concrete is buried in the new vertical member 30, comprising:

[0057] Casting high expansion concrete on the lower horizontal member 12 to form the lower section 31;

[0058] Providing a buttress 40, and arranging the buttress 40 on the lower section 31;

[0059] Casting high expansion concrete on the pier 40 to form the upper section 32;

[0060] Low expansion concrete is poured between the upper section 32 and the lower section 31 to form a middle section 33 covering the pier 40 .

[0061] Specifically, the formwork is supported in sections at the position of the original vertical member on the lower horizontal member 12, and the formwork of the lower section is supported first, and high-expansion concrete is poured to form the lower section 31. Then, the pier 40 is set on the lower section 31, and the formwork of the upper section is supported above the pier 40, and high-expansion concrete is poured to form the upper section 32. At this time, the pier 40 is located between the upper section 32 and the lower section 31, and low-expansion concrete needs to be poured between the upper section 32 and the lower section 31 to cover the pier 40. After the concrete reaches the predetermined strength, the new vertical member mainly supports the upper horizontal member 11 and the lower horizontal member 12. When the force transmission of the jack is measured to be substantially zero, the support structure can be removed.

[0062] As a preferred embodiment of the replacement method of the concrete vertical member of the present invention, a buttress 40 is provided, including a buckling restraint bearing providing a yield force equal to the initial axial force of the original vertical member.

[0063] Specifically, the cross section of the buckling restraint bearing is designed according to the initial axial force of the original vertical member, so that the yield force of the buckling restraint bearing is equal to the axial force. The height of the buckling restraint bearing is designed according to the expansion rate of the high expansion concrete and the later shrinkage rate. The height of the buckling restraint bearing is small, and the shrinkage deformation of the low expansion concrete used to cover the middle section of the buried buckling restraint bearing is also small, which is easy to control.

[0064] Specific principle: High expansion concrete expands during the solidification process, squeezing the buckling restraint support; when the internal force of the buckling restraint support reaches the yield stress, it basically stops increasing, and no additional axial force is generated on the upper and lower horizontal members. After the buckling restraint support yields, it continues to be squeezed by the high expansion concrete to produce plastic deformation. Specifically, the yield stress is the phenomenon that when the stress reaches a certain value during the stretching or compression of the material, the stress increases slightly, while the strain increases sharply. This is called yielding. The positive stress that causes the material to yield is the yield stress of the material.

[0065] In the later stage of construction, the high expansion concrete shrinks. During the design, the shrinkage deformation of the high expansion concrete is made within the plastic deformation range of the buckling restrained bearing, that is, the buckling restrained bearing is still in a yielding state.

[0066] As a preferred embodiment of the method for replacing the concrete vertical member of the present invention, refer to Figure 6 A schematic diagram of a buckling restrained support for a replacement method for a concrete vertical member of the present invention. Figure 7 for Figure 6 AA direction cross-sectional view. Figures 3 to 7 As shown, providing a buckling restraint support includes: providing a sleeve 41 and a core plate 42, inserting the core plate 42 into the sleeve 41; providing an upper connecting plate 43 and a lower connecting plate 44, fixing the lower connecting plate 44 to the bottom of the sleeve 41, connecting the lower connecting plate 44 to the lower section 31, fixing the upper connecting plate 43 to the core plate 42, and connecting the upper connecting plate 43 to the upper section 32.

[0067] Specifically, the buckling restraint support consists of an inner core component and a peripheral restraint system. The inner core component bears axial pressure, and the periphery is used to restrain the lateral displacement of the inner core component to prevent the inner core from buckling, so that the entire cross-section can yield under the action of axial pressure, thereby obtaining a stable bearing capacity.

[0068] The present invention also provides a replacement structure of a concrete vertical member, comprising:

[0069] A new vertical member 30 is cast in sections on the lower horizontal member 12 by high expansion concrete, and the top of the new vertical member 30 is connected to the upper horizontal member 11;

[0070] The pier 40 is embedded in the new vertical member 30 and can adaptively adjust the axial force of the new vertical member 30 according to the expansion and contraction of the high expansion concrete.

[0071] As a preferred embodiment of the replacement structure of the concrete vertical member of the present invention, the new vertical member 30 includes:

[0072] A lower section 31 is formed on the lower horizontal member 12 by pouring high expansion concrete, and a buttress 40 is provided on the lower section 31;

[0073] The upper section 32 is formed on the buttress 40 by pouring high expansion concrete;

[0074] The middle section 33 covering the buttress 40 is formed by pouring low expansion concrete between the upper section 32 and the lower section 31 .

[0075] As a preferred embodiment of the replacement structure of the concrete vertical member of the present invention, the buttress 40 is a buckling restraint bearing with a yield force equal to the initial axial force of the original vertical member.

[0076] As a preferred embodiment of the replacement structure of the concrete vertical member of the present invention, the buckling restraint support comprises:

[0077] A sleeve 41 and a core plate 42 inserted into the sleeve 41;

[0078] A lower connecting plate 44 is fixedly connected to the bottom of the sleeve 41 , and the lower connecting plate 44 is connected to the lower section 31 . An upper connecting plate 43 is fixedly connected to the core plate 42 , and the upper connecting plate 43 is connected to the upper section 32 .

[0079] The core plate 42 is an I-shaped steel and the sleeve 41 is an adapted I-shaped sleeve.

[0080] Specifically, the buckling restraint support consists of a core component and a peripheral restraint system. The core component bears axial pressure, and the peripheral restraint system is used to restrain the lateral displacement of the core component to prevent the core from buckling, so that it can undergo full-section yielding under axial pressure while maintaining a stable bearing capacity.

[0081] The beneficial effects of the replacement method and replacement structure of the concrete vertical member of the present invention are as follows:

[0082] The present invention forms a new vertical member by casting high-expansion concrete. The high-expansion concrete expands during the solidification process and squeezes the pier. When the internal force of the pier reaches the yield stress, it basically stops increasing and no additional axial force is generated on the upper horizontal member and the lower horizontal member. After the pier yields, it continues to be squeezed by the high-expansion concrete to produce plastic deformation. In the later stage of construction, the high-expansion concrete shrinks. Since the shrinkage deformation of the high-expansion concrete is designed to be within the plastic deformation range of the pier, the pier is still in a yielded state. The present invention controls the axial force of the new vertical member by adjusting the high-expansion concrete and the pier, which can solve the problem of difficulty in controlling the axial force balance of the new vertical member when replacing the concrete vertical member in the prior art.

[0083] The present invention is described in detail above in conjunction with the embodiments of the accompanying drawings. A person skilled in the art can make various variations of the present invention according to the above description. Therefore, certain details in the embodiments should not constitute a limitation of the present invention, and the scope of protection of the present invention shall be defined by the scope of the attached claims.

Claims

1. A method for replacing a concrete vertical member, for replacing an original vertical member supported between an upper horizontal member and a lower horizontal member with a new vertical member, characterized in that: The replacement method comprises the following steps: At least one supporting structure disposed close to the original vertical member and supported between the upper horizontal member and the lower horizontal member; Remove the original vertical components; The method comprises: pouring high-expansion concrete in sections on the lower horizontal member to form a new vertical member whose top is connected to the upper horizontal member, and burying a pier in the new vertical member to adaptively adjust the axial force of the new vertical member according to the expansion and contraction of the high-expansion concrete, comprising: pouring the high expansion concrete on the lower horizontal member to form a lower section; Providing buttresses, and arranging the buttresses on the lower section; pouring the high expansion concrete on the pier to form an upper section; pouring low expansion concrete between the upper section and the lower section to form a middle section covering the pier; The buttress is a buckling restraint bearing with a yield force equal to the initial axial force of the original vertical member. The buckling restraint bearing comprises: a sleeve and a core plate inserted in the sleeve, a lower connecting plate fixed to the bottom of the sleeve, the lower connecting plate is connected to the lower section, an upper connecting plate fixed to the core plate, the upper connecting plate is connected to the upper section, the core plate is an I-beam, and the sleeve is an adapted I-shaped sleeve; The support structure is removed.

2. The method for replacing a concrete vertical member according to claim 1, characterized in that: The height of the support structure is adjustable; Before removing the original vertical member, the method further includes: adjusting the height of the support structure so that the axial force of the original vertical member is reduced to zero.

3. The method for replacing a concrete vertical member according to claim 2, characterized in that: The supporting structure is provided, comprising: Providing a jack, and placing the jack on the lower horizontal member; A support column with a height less than the distance between the upper horizontal member and the lower horizontal member is provided, and the support column is erected on the jack, with the top of the support column supported by the bottom of the upper horizontal member.

4. A replacement structure for a concrete vertical member, characterized in that: include: A new vertical member is cast in sections on the lower horizontal member by high expansion concrete, and the top of the new vertical member is connected to the upper horizontal member; The new vertical component comprises: A buttress embedded in the new vertical member and capable of adaptively adjusting the axial force of the new vertical member according to the expansion and contraction of the high-expansion concrete; A lower section is formed on the lower horizontal member by pouring the high expansion concrete, and the pier is arranged on the lower section; An upper section formed on the pier by pouring the high expansion concrete; A middle section covering the pier formed by pouring low expansion concrete between the upper section and the lower section; The pier is a buckling restrained bearing with a yield force equal to the initial axial force of the original vertical member. The buckling restrained bearing includes: a sleeve and a core plate inserted in the sleeve, a lower connecting plate fixed to the bottom of the sleeve, the lower connecting plate is connected to the lower section, an upper connecting plate fixed to the core plate, the upper connecting plate is connected to the upper section, the core plate is an I-beam, and the sleeve is an adapted I-shaped sleeve.

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