A precast concrete formwork for basement post-cast strip

Abstract

This utility model discloses a precast concrete formwork for basement post-pouring strips, relating to the field of building construction technology. It includes a formwork body made of C30 concrete, with a single-layer bidirectional steel mesh embedded inside. The steel mesh is made of 10mm diameter steel bars, with a spacing of 200mm between each bar. Herringbone ties are pre-embedded inside the formwork body and are tied to the steel mesh. This utility model uses precast C30 concrete for the formwork body, allowing it to be used as part of the post-pouring strip structure without dismantling. Compared to traditional wooden formwork, it eliminates the need for formwork removal and allows for direct exterior wall waterproofing and trench backfilling, thus improving overall construction progress.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, specifically to a precast concrete formwork for basement post-pouring strips. Background Technology

[0002] A post-cast strip is a special joint that is a temporary construction joint artificially left during the construction of a cast-in-place reinforced concrete structure. Its purpose is to overcome the potentially harmful effects on the structure due to temperature shrinkage and settlement of the main structure.

[0003] The concrete for the basement post-cast strip needs to be poured after the main structures on both sides are completed and the settlement is stable. If ordinary wooden formwork is used, the exterior wall waterproofing construction and backfilling of the trench can only be carried out after the formwork of the post-cast strip is removed, which seriously affects the subsequent construction progress. If brick formwork is used, it cannot meet the lateral pressure of the soil during the backfilling of the trench, which also affects the construction progress. Utility Model Content

[0004] In view of the aforementioned existing problems, this utility model is proposed.

[0005] Therefore, the purpose of this utility model is to provide a precast concrete formwork for the post-pouring strip of a basement. Using precast concrete formwork at the post-pouring strip location of the basement is superior to ordinary wooden formwork and brick formwork, meets the requirements of waterproof construction, improves construction efficiency, and can meet the needs of the site while ensuring safety and economy. It provides a reference for the subsequent construction of the post-pouring strip of the basement and has great market application and promotion value.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A precast concrete formwork for a basement post-cast strip includes a formwork body, which is cast from C30 concrete. A single-layer bidirectional steel mesh is embedded inside the formwork body. The steel mesh is made of steel bars with a diameter of 10mm and the spacing between each steel bar is 200mm. Figure-eight binding wires are pre-embedded inside the formwork body and are tied to the steel mesh.

[0007] Preferably, the figure-eight binding wire comprises at least two binding wires, with the middle end of the figure-eight binding wire disposed on the outer surface of the template body.

[0008] Preferably, the two ends of the figure-eight binding wire are located at 1 / 3 and 2 / 3 of the length of the template body, respectively.

[0009] Preferably, the ends of the reinforcing bars in the steel mesh do not extend beyond the edge of the formwork body, and the thickness of the concrete protective layer between the steel mesh and the inner and outer walls of the formwork body is 15-20mm.

[0010] Preferably, the upper surface of the template body is provided with a textured surface, and the texture depth is 2-3mm.

[0011] Preferably, all four corners of the template body are rounded, and the radius of the rounded corners is 10-12mm.

[0012] The technical effects and advantages provided by this utility model in the above technical solution are as follows: 1. In this utility model, the formwork body is made of C30 precast concrete, which can be used as part of the post-pouring strip structure without dismantling. Compared with traditional wooden formwork, it saves the formwork dismantling process and can directly carry out external wall waterproofing construction and trench backfilling, thus improving the overall construction progress.

[0013] 2. In this utility model, the figure-eight binding wire 3 is fixed in a preset position inside the template by binding, without the need for additional welding connection. The binding wire and the post-pouring strip reinforcement are directly tied together, which makes it easier to fix with the post-pouring strip reinforcement. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 For the present utility model Figure 1 Partial sectional perspective view; Figure 3 For the present utility model Figure 1 A three-dimensional diagram of the connection between the steel mesh and the figure-eight tie wire.

[0016] Explanation of reference numerals in the attached figures: 1. Template body; 2. Steel mesh; 3. Herringbone binding wire. Detailed Implementation

[0017] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0018] This utility model discloses a precast concrete formwork for basement post-pouring strips.

[0019] This utility model provides, for example Figure 1-3The precast concrete formwork for a basement post-cast strip shown includes a formwork body 1, which is made of C30 concrete. A single-layer bidirectional steel mesh 2 is embedded inside the formwork body 1. The steel mesh 2 is made of steel bars with a diameter of 10mm and the spacing between each steel bar is 200mm. A figure-eight tie wire 3 is pre-embedded inside the formwork body 1 and is tied to the steel mesh 2.

[0020] The formwork body 1 is made of C30 concrete with a permeability grade of P6, possessing sufficient strength and durability to withstand the lateral pressure of the soil during trench backfilling. No additional support structure is required, avoiding the deformation problem caused by insufficient strength of traditional brick formwork. The formwork body 1 does not need to be removed and directly bonds with the new concrete when pouring the post-pouring strip concrete, simplifying the construction process and eliminating the formwork removal process. This accelerates the subsequent exterior wall waterproofing construction and trench backfilling progress, improving the overall construction efficiency.

[0021] like Figure 1-3 As shown, the figure-eight binding wire 3 includes at least two binding wires. The middle end of the figure-eight binding wire 3 is located on the outer surface of the template body 1, and the two ends of the figure-eight binding wire 3 are located at 1 / 3 and 2 / 3 of the length of the template body 1, respectively.

[0022] It contains at least two binding wires, with the middle end located on the outer surface of the template body 1 and the two ends located at 1 / 3 and 2 / 3 of the template length direction, respectively. The figure-eight binding wires 3 are fixed in the preset position inside the template by binding, without the need for additional welding connection. The binding wires and the post-pouring strip reinforcement are directly tied together, which makes it easier to fix with the post-pouring strip reinforcement.

[0023] like Figure 1-3 As shown, the ends of the reinforcing bars in the steel mesh 2 do not extend beyond the edge of the template body, and the thickness of the concrete protective layer between the steel mesh and the inner and outer walls of the template body 1 is 15-20mm.

[0024] The single-layer bidirectional steel mesh 2 is made of steel bars with a diameter of 10mm and a spacing of 200mm. It enhances the crack resistance and structural integrity of the formwork body 1, prevents cracks from appearing during transportation, installation and stress, and ensures its stability under earth pressure. The steel mesh 2 can be connected to the steel bars in the post-cast strip concrete by binding or welding, so that the formwork body 1 and the post-cast strip structure form an integral load-bearing system, improve the structural strength of the post-cast strip and meet the basement's anti-seepage and anti-compression requirements. The ends of the steel bars in the steel mesh do not extend beyond the edge of the formwork body, and the thickness of the concrete protective layer between the inner and outer walls of the formwork is 15-20mm, which ensures the bond strength between the steel bars and the concrete and prevents the steel bars from corroding and affecting the structural durability.

[0025] like Figure 1-2As shown, the upper surface of the template body 1 is provided with concave and convex textures, and the texture depth is 2-3mm.

[0026] The textured surface of the template body 1 increases the contact area with the newly poured concrete of the post-pouring strip, enhances the bond between the old and new concrete through mechanical interlocking, avoids cracks, and improves the impermeability of the post-pouring strip.

[0027] like Figure 1-2 As shown, all four corners of the template body 1 are rounded, and the radius of the rounded corners is 10-12mm.

[0028] The four corners of the template body 1 are rounded to prevent personnel from being injured by sharp corners during construction, and to reduce stress concentration at the corners of the template, preventing damage to the corners during transportation or under stress, thus extending the service life of the template.

[0029] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A precast concrete formwork for post-cast strips in basements, comprising a formwork body (1), characterized in that, The template body (1) is made of C30 concrete. A single-layer bidirectional steel mesh (2) is embedded inside the template body (1). The steel mesh (2) is made of steel bars with a diameter of 10mm. The spacing between each steel bar is 200mm. The template body (1) is pre-embedded with figure-eight binding wire (3). The figure-eight binding wire (3) is tied to the steel mesh (2).

2. The precast concrete formwork for basement post-cast strips according to claim 1, characterized in that, The figure-eight binding wire (3) contains at least two binding wires, and the middle end of the figure-eight binding wire (3) is located on the outer surface of the template body (1).

3. The precast concrete formwork for basement post-cast strips according to claim 1, characterized in that, The two ends of the figure-eight tie wire (3) are located at 1 / 3 and 2 / 3 of the length of the template body (1), respectively.

4. The precast concrete formwork for basement post-cast strips according to claim 1, characterized in that, The ends of the steel bars in the steel mesh (2) do not extend beyond the edge of the template body, and the thickness of the concrete protective layer between the steel mesh and the inner and outer walls of the template body (1) is 15-20mm.

5. The precast concrete formwork for post-cast strips in basements according to claim 1, characterized in that, The upper surface of the template body (1) is provided with a textured surface, and the textured surface has a depth of 2-3 mm.

6. The precast concrete formwork for basement post-cast strips according to claim 1, characterized in that, The four corners of the template body (1) are rounded, and the radius of the rounded corners is 10-12mm.

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