A construction method for post-casting strip formwork support

Abstract

The present invention discloses a construction method for post-casting strip formwork support, which focuses on solving the problem that the post-casting strip position needs to be re-erected and installed after the main body is capped, improves the turnover rate of the formwork and steel pipe, and realizes convenient formwork support for the post-casting strip after the main body is capped. It can avoid the problem that the post-casting strip formwork support installation in the prior art is usually installed and erected synchronously when the structures on both sides of the post-casting strip are constructed, and the support is retained until the post-casting strip is divided into two sides and the main body is capped, and then the post-casting strip construction is carried out, which will cause the post-casting strip formwork, steel pipe and other materials to be unable to be used in a turnover manner, and the concrete slag is difficult to clean in the formwork after the post-casting strip position is chiseled and repaired, and at the same time, it causes the problem that personnel pass through the post-casting strip position and the material transportation is difficult.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction engineering, and in particular relates to a construction method for post-casting strip formwork support. Background Art

[0002] During the construction of conventional post-casting strips, in order to ensure that the cantilevered beam-slab structures on both sides of the post-casting strips do not deform and deflect, independent support racks need to be erected during structural construction for support, and they are not allowed to be removed during the structural demoulding stage, and they need to be retained until the post-casting strips are poured and closed. However, the temperature expansion post-casting strips can generally be closed 60 days after the concrete pouring is completed, and the settlement post-casting strips need to be capped on the ground and the settlement on both sides can be closed only after they are stable. The time span is large. During this period, the bottom formwork and independent support racks at the post-casting strip position cannot be removed, so a large formwork and rack rental fee will be generated, increasing the construction cost of the project. During the construction of conventional post-casting strips, the bottom formwork and racks need to be arranged and erected independently, which has the disadvantages of inconvenient operation and low work efficiency. Moreover, in the construction process of the post-casting strip, the bottom support and template of the post-casting strip cannot be removed for a long time, resulting in excessive backlog of materials and inability to turn around.

[0003] In order to solve the above problems, some researchers have proposed some solutions in recent years. For example, Chinese patent publication number CN116623989A discloses a support form of a structural column supporting a post-cast strip, but when pouring the post-cast strip in the later stage, it is still necessary to re-erect steel pipe fasteners for support, which increases the burden of material consumption in the later stage of construction.

[0004] Currently, there is no construction method in the industry that can satisfy the requirement of independent support of the post-cast joint during construction while not requiring effective material saving when pouring the post-cast joint in the later stage.

[0005] Therefore, it is urgent to invent a construction method for post-casting strip formwork support, hoping to effectively improve the turnover of steel pipes and formwork materials at the post-casting strip position, and to complete the post-casting strip formwork support with less materials and labor in the later stage. Summary of the invention

[0006] In view of the problem that in the prior art, the installation of the formwork support for the post-casting strip is usually installed and erected simultaneously when the structures on both sides of the post-casting strip are constructed, and the support is retained until the main body on both sides of the post-casting strip is capped, and then the post-casting strip construction is carried out. As a result, the post-casting strip formwork, steel pipes and other materials cannot be circulated and used, and the concrete debris in the formwork is difficult to clean after the post-casting strip position is chiseled and repaired. At the same time, it makes it difficult for people to pass through the post-casting strip position and transport materials. The present invention provides a construction method for the formwork support for the post-casting strip, which focuses on solving the problem that the support needs to be re-erected and installed at the post-casting strip position after the main body is capped, thereby improving the turnover rate of the formwork and steel pipe, and realizing convenient formwork for the post-casting strip after the main body is capped.

[0007] The purpose of the present invention is achieved through the following technical solutions:

[0008] A construction method for post-casting strip formwork support, comprising the following steps:

[0009] 1) When constructing the structural beams and slabs on both sides of the post-casting strip, structural column supports are set on both sides to ensure the stability of the beam and slab structures on both sides of the post-casting strip, and tie screws or water stop screws are pre-buried on both sides of the post-casting strip, and the screw spacing is pre-buried according to the fixed modulus;

[0010] 2) After the construction on both sides of the post-casting belt in the above step is completed, the bottom steel formwork supports on both sides of the post-casting belt are removed for turnover construction, and the structures on both sides of the post-casting belt are supported by the structural columns. The post-casting belt construction begins 28 days after the main construction is completed, and the concrete on both sides of the post-casting belt is chiseled;

[0011] 3) After adjusting the steel bars, install aluminum formwork at the bottom of both sides of the post-cast strip, reinforce it with pre-buried screws, and complete the post-cast strip construction.

[0012] Furthermore, the pre-buried tension screws or water-stop screws on both sides of the post-cast strip described in step 1) are used for roofs and basement top plates.

[0013] Furthermore, in step 2), the concrete on both sides of the post-cast strip is chiseled, and since there is no formwork at the bottom, there is no need to clean up the garbage in the post-cast strip.

[0014] Furthermore, in step 3), there is no need to re-erect the bottom steel pipe support, thereby achieving the purpose of material turnover.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. At present, when constructing the post-casting strip of conventional structure, a large amount of materials such as formwork and steel pipes are usually piled up, or the independent structural column support and I-beam support of the post-casting strip also need to re-erect the steel pipe installation formwork when constructing the post-casting strip in the later stage. After the main construction is completed, most of the steel pipe formwork materials are usually out of the site, and the cost of re-arranging the materials to enter the site for construction increases. The construction method of the post-casting strip formwork support described in the present invention does not need to re-erect the post-casting strip support, which greatly improves the utilization efficiency of materials. The construction method of the present invention leaves independent supports (which can be structural columns or I-beams) when constructing the structures on both sides of the post-casting strip, and adds fixed supports to the cantilever structures on both sides of the post-casting strip, so the formwork and support can be removed after the concrete strength reaches the demolding conditions. The addition of fixed supports improves the safety of the structures on both sides of the post-casting strip, can effectively prevent the cracking of the beams and slabs on both sides of the post-casting strip, and ensures safety and quality. After the post-casting strip formwork support is removed, the image of safety and civilization is improved, and the passage of personnel and material transportation are convenient. At the same time, the removed steel pipes and formwork can be used for turnover, which greatly saves material costs.

[0017] 2. In the construction method of the post-casting strip formwork support described in the present invention, screws are embedded when the structures on both sides of the post-casting strip are cast, and the pre-embedded screws are used to install the reinforced formwork when the post-casting strip is subsequently closed. The post-casting strip is usually closed in the later stage of the project construction, and the traditional method requires the retention of steel pipes for the support system, resulting in the long-term retention of steel pipe materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a site construction drawing of a construction method of a post-casting strip formwork support according to an embodiment of the present invention;

[0019] Figure 2 It is a schematic diagram of the construction method of the traditional post-casting strip formwork support described in the comparative example of the present invention;

[0020] Figure 3 Schematic diagram of the construction method of the post-casting strip formwork support in the prior art (left: when the post-casting strip is left; right: when the post-casting strip is closed);

[0021] Figure 4 This is a construction drawing of a construction method for a post-cast strip formwork support described in an embodiment of the present invention (left side: when a post-cast strip is left; right side: when the post-cast strip is closed). DETAILED DESCRIPTION

[0022] The specific implementation of the present invention is further described below in conjunction with the examples. The following examples are intended to illustrate the present invention rather than to further limit the present invention. If no specific conditions are specified in the experimental examples, they can be carried out according to conventional methods.

[0023] Example:

[0024] A construction method for post-casting strip formwork support comprises the following steps:

[0025] 1) When constructing the structural beams and slabs on both sides of the post-casting strip, structural columns are set on both sides to ensure the stability of the beam and slab structures on both sides of the post-casting strip, and tie screws or water stop screws (for roofs and basement top plates) are pre-buried on both sides of the post-casting strip, and the screw spacing is pre-buried according to a fixed modulus;

[0026] 2) After the construction on both sides of the post-casting belt is completed in the above step, the steel formwork support at the bottom of both sides of the post-casting belt is removed for turnover construction, and the structure on both sides of the post-casting belt is supported by the structural column. The post-casting belt construction starts 28 days after the main construction is completed, and the concrete on both sides of the post-casting belt is chiseled. Because there is no formwork at the bottom, there is no need to clean up the garbage in the post-casting belt;

[0027] 3) After adjusting the steel bars, install aluminum formwork at the bottom of both sides of the post-casting strip and reinforce it with pre-buried screws. After the post-casting strip construction is completed, there is no need to re-erect the bottom steel pipe support to achieve the purpose of material turnover.

[0028] Figure 1 It is a site construction drawing of a construction method of a post-casting strip formwork support described in this embodiment;

[0029] Figure 4 This is a construction drawing of a construction method for a post-cast strip formwork support described in this embodiment (left side: when a post-cast strip is left; right side: when the post-cast strip is closed).

[0030] Comparative Example 1:

[0031] An example of existing post-casting strip formwork support includes the following steps:

[0032] 1) When constructing the structural beams and slabs on both sides of the post-casting strip, the post-casting strip steel pipe support is normally set up and the formwork is installed. This part of the support and formwork will not be removed before the post-casting strip is closed;

[0033] 2) Start the post-casting belt construction 28 days after the main construction is completed. Chisel the concrete on both sides of the post-casting belt. If the garbage and debris cannot be cleaned up, remove the partial formwork at the bottom of the post-casting belt for cleaning;

[0034] 3) Adjust the steel bars and bottom formwork of the post-cast joint, and pour concrete to seal the post-cast joint.

[0035] Figure 2 This is a schematic diagram of the construction method of the traditional post-cast strip formwork support described in Comparative Example 1.

[0036] Comparative Example 2:

[0037] An example of existing post-casting strip formwork support includes the following steps:

[0038] 1) When constructing the structural beams and slabs on both sides of the post-casting strip, the steel pipe supports of the post-casting strip are normally set up, the formwork is installed, and the independent supporting structural columns or I-beams on both sides of the post-casting strip are installed at the same time. The steel pipe formwork on both sides of the post-casting strip is removed after the concrete strength of the beam and slab structure reaches the requirements;

[0039] 2) The front and rear cast-in strips of the main body are supported by structural columns or I-beams. The cast-in strips are cleaned and the steel bars are adjusted 28 days after the main body is capped;

[0040] 3) Re-erect the post-cast joint support, install the formwork, and remove the independent support after closing the post-cast joint.

[0041] Figure 3 Schematic diagram of the construction method of the post-cast strip formwork support in Comparative Example 2 (left: when the post-cast strip is left; right: when the post-cast strip is closed).

[0042] Results and discussion:

[0043] At present, during the construction of conventional structure post-casting strips, a large amount of formwork, steel pipes and other materials are usually piled up, or the independent structural column supports and I-beam supports of the post-casting strips also need to re-erect steel pipe installation formwork during the later construction of the post-casting strips. After the main construction is completed, most of the steel pipe formwork materials have usually been removed from the site, and the cost of rearranging the materials to be brought in for construction increases.

[0044] The construction method of the post-cast strip formwork support described in the present invention does not need to re-erect the post-cast strip support, which greatly improves the utilization efficiency of materials. The construction method of the present invention leaves independent supports (which can be structural columns or I-beams) when constructing the structures on both sides of the post-cast strip, and adds fixed supports to the cantilever structures on both sides of the post-cast strip. Therefore, the formwork and support can be removed after the concrete strength reaches the demolding conditions. The addition of fixed supports improves the safety of the structures on both sides of the post-cast strip, and can effectively prevent the cracking of the beams and slabs on both sides of the post-cast strip, ensuring safety and quality. After the post-cast strip formwork support is removed, the safety and civilized image is improved, and the passage of personnel and the transportation of materials are convenient. At the same time, the dismantled steel pipes and formworks can be used for turnover, which greatly saves material costs.

[0045] The invention discloses a construction method for supporting the post-casting strip formwork, wherein screws are embedded during the pouring of the structures on both sides of the post-casting strip, and the pre-embedded screws are used to install the reinforcement formwork when the post-casting strip is subsequently closed. The post-casting strip is usually closed in the later stage of the project construction, and the traditional method requires the retention of steel pipes for the support system, resulting in the long-term retention of steel pipe materials.

[0046] The above description is only a preferred embodiment of the present invention. It should be pointed out that it is possible for a person skilled in the art to make several improvements and changes without departing from the creative concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A construction method for post-casting strip formwork support, characterized in that: The steps include: 1) When constructing the structural beams and slabs on both sides of the post-casting strip, structural column supports are set on both sides to ensure the stability of the beam and slab structures on both sides of the post-casting strip, and tie screws or water stop screws are pre-buried on both sides of the post-casting strip, and the screw spacing is pre-buried according to the fixed modulus; 2) After the construction on both sides of the post-casting belt in the above step is completed, the bottom steel formwork supports on both sides of the post-casting belt are removed for turnover construction, and the structures on both sides of the post-casting belt are supported by the structural columns. The post-casting belt construction begins 28 days after the main construction is completed, and the concrete on both sides of the post-casting belt is chiseled; 3) After adjusting the steel bars, install aluminum formwork at the bottom of both sides of the post-cast strip, reinforce it with pre-buried screws, and complete the post-cast strip construction.

2. The construction method of a post-casting strip formwork support according to claim 1, characterized in that: The pre-buried tension screws or water-stop screws on both sides of the post-cast strip described in step 1) are used for roofs and basement top plates.

3. The construction method of a post-casting strip formwork support according to claim 1, characterized in that: In step 2), the concrete on both sides of the post-cast strip is chiseled, and there is no template at the bottom, so there is no need to clean up the garbage in the post-cast strip.

4. The construction method of a post-casting strip formwork support according to claim 1, characterized in that: In step 3), there is no need to re-erect the bottom steel pipe support to achieve the purpose of material turnover.

Images