Construction method of leaving construction joints as partition joints in cement concrete floor construction

Abstract

The present invention discloses a construction method for leaving construction joints as expansion joints in cement concrete floor construction, comprising: installing lateral formwork outside the expansion joint position; constructing the building floor concrete; removing the lateral formwork when the concrete strength reaches the demoulding requirement, with the rectangular formwork and positioning plate first removed along with the lateral formwork; then squeezing the U-shaped formwork to separate it from the concrete and removing it; treating the concrete construction joint, positioning it according to the location of the building expansion joint, and cutting the expansion joint to the position of the groove left by the U-shaped formwork; constructing the next section of the building floor, and cutting the newly poured concrete side at the expansion joint to ensure the expansion joint width and depth requirements, and finally caulking the expansion joint according to design requirements. The present invention effectively combines the construction joint and the expansion joint in the building floor and ensures the aesthetic effect of the construction joint.

Description

Technical Field

[0001] The invention belongs to the field of building construction, and in particular relates to a construction method for leaving construction joints as partition joints in cement concrete floor construction. Background Art

[0002] In construction project design, architects often use cement concrete or cement concrete as the base layer for the overall surface layer of some large-scale building floors. This type of building floor not only meets practical requirements such as compressive resistance and durability, but also can be slightly treated to achieve aesthetic effects, such as incorporating corundum to create a hardened and wear-resistant surface layer or laying a cement-based self-leveling surface layer. For large-scale cement concrete floors in buildings, such as large parking lots and exhibition halls, it is usually difficult to cast the entire surface layer in one go. Segmented construction is required based on construction deployment, human resources, and equipment investment. Construction joints are treated at the intersection of the concrete in each segment. At the same time, according to the design requirements of the building floor, large-area cement surface layers must be provided with partition joints.

[0003] Therefore, according to the need of leaving construction joints in segmented construction and the design requirement of leaving expansion joints on the building ground, it is necessary to propose a construction method of leaving construction joints as expansion joints in cement concrete floor construction. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to solve the problem of leaving concrete construction joints in the construction of the overall surface layer of a large area of cement concrete building ground to meet the treatment requirements of the concrete construction joints and serve as partition joints of the building ground.

[0005] In order to achieve the above technical effects, the present invention adopts the following technical solutions:

[0006] A construction method for leaving construction joints as partition joints in cement concrete floor construction, comprising the steps of:

[0007] Determine the construction sections and sequence based on the division of the building ground surface layer into sections;

[0008] The construction of the building ground reinforcement binding and the installation of the side formwork are carried out according to the construction section and construction sequence. The side formwork is installed outside the partition joint position. A horizontal positioning plate extending to the bottom position of the partition joint is fixed on the side formwork. A rectangular formwork is fixed on the side formwork above the positioning plate. A U-shaped formwork is sleeved on the positioning plate. The upper surface of the U-shaped formwork is in contact with the lower surface of the rectangular formwork, and the width of the U-shaped formwork is greater than the width of the rectangular formwork.

[0009] Building floor concrete construction;

[0010] When the concrete strength reaches the requirements for formwork removal, the side formwork is removed. The rectangular formwork and positioning plate are removed together with the side formwork first; then the U-shaped formwork is squeezed to separate it from the concrete and removed;

[0011] Carry out concrete construction joint treatment, lay out and locate the construction joints according to the location of the building partition joints, and cut the partition joints to the grooves left by the U-shaped formwork;

[0012] Carry out the construction of the next section of the building ground, and cut the new concrete side at the expansion joint to ensure the expansion joint width and depth requirements, and finally carry out the expansion joint caulking construction according to the design requirements.

[0013] As a further solution of the present invention, the lateral formwork is installed 10 mm to 20 mm outside the partition joint position.

[0014] As a further solution of the present invention, in the step of treating the concrete construction joint, surface laitance and gravel are removed.

[0015] As a further solution of the present invention, before the construction of the next section of the building floor, a layer of plain cement slurry is brushed on the joint surface of the previous section of the building floor to strengthen the bonding between the new and old concrete.

[0016] The beneficial effects of the present invention are:

[0017] 1) Solve the problem of segmented construction of large-area cement concrete building floors, leaving construction joints and ensuring that the construction joints meet the requirements of the building surface aesthetics;

[0018] 2) A special steel formwork is used to retain the construction joints in the construction of cement concrete buildings, ensuring the treatment requirements of the cement concrete construction joints at the sections and providing the ground surface layer for cutting treatment to meet the construction joints and sub-section joints construction requirements;

[0019] 3) The construction method is simple, practical and has strong scalability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 This is a schematic diagram of the side template assembly according to an embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of the side template splitting embodiment of the present invention.

[0023] Figure 3 This is a schematic diagram of the ground construction section division according to an embodiment of the present invention.

[0024] Figure 4 This is a schematic diagram of the installation of the ground lateral formwork according to an embodiment of the present invention.

[0025] Figure 5 This is a schematic diagram of the first step of dismantling the ground lateral formwork according to an embodiment of the present invention.

[0026] Figure 6 This is a schematic diagram of the second step of dismantling the ground lateral formwork according to an embodiment of the present invention.

[0027] Figure 7 This is a schematic diagram of the treatment of construction joints at poured locations according to an embodiment of the present invention.

[0028] Figure 8 This is a schematic diagram of the cut seams of the poured grid according to an embodiment of the present invention.

[0029] Figure 9 This is a schematic diagram of the construction of adjacent sections of ground concrete according to an embodiment of the present invention.

[0030] Figure 10 This is a schematic diagram of the cutting construction of adjacent sections of ground concrete partition joints according to an embodiment of the present invention.

[0031] Figure 11 This is a schematic diagram of the construction of caulking of divided joints according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0033] The following describes an embodiment of the present invention based on its overall structure.

[0034] See Figure 1 and Figure 2 , is a lateral formwork structure, which includes the main body of the lateral formwork 11, and a horizontal positioning plate 111 fixed vertically to the side of the lateral formwork 11 facing the concrete building ground. The width of the positioning plate 111 is preferably designed to extend to the bottom position of the partition joint 12 on the concrete building ground when in use. The partition joint 12 refers to the joint pre-set on the roof leveling layer, rigid waterproof layer, and rigid protective layer in order to reduce cracks. The rigid protective layer is only made into a V-shaped groove on its surface, which is called a surface partition joint. In this embodiment, the distribution of the partition joint 12 on the concrete building ground is as follows Figure 3 shown.

[0035] Back to Figure 1 and Figure 2 A rectangular formwork 112 is fixed to the lateral formwork 11 above the positioning plate 111, forming a stepped construction joint in the concrete floor. A U-shaped formwork 113 is mounted on the positioning plate 111. The upper surface of the U-shaped formwork 113 mates with the lower surface of the rectangular formwork 112, and the width of the U-shaped formwork 113 is greater than that of the rectangular formwork 112, leaving a horizontal gap between the front end of the rectangular formwork 112 and the location of the partition joint.

[0036] The lateral template 11 and the U-shaped template 113 can be made of steel. The U-shaped template 113 is connected to the positioning plate 111 in a snap-fit manner.

[0037] Cooperate Figures 5-11 As shown, a construction method for leaving construction joints as partition joints in cement concrete floor construction according to an embodiment of the present invention comprises the following steps:

[0038] Step 1: For large-area cement concrete building floors, firstly, make construction arrangements based on the division of the building floor surface layer and production capacity, and determine the construction sections and construction sequence, such as Figure 3 shown.

[0039] Step 2: Tie the steel bars on the ground and install the side formwork according to the construction section and construction sequence. The side formwork 11 is installed 10mm to 20mm outside the partition joint position 14. Figure 4 As shown, a U-shaped formwork 113 is mounted on the positioning plate 111 of the lateral formwork 11. When the open end of the U-shaped formwork 113 fits with the main body of the lateral formwork 11, the closed end of the U-shaped formwork 113 is located exactly at the partition joint position 14 and is flush with the bottom elevation of the partition joint 12. The sizes and specifications of the lateral formwork 11 and the U-shaped formwork 113 can be prefabricated in the factory according to actual construction conditions and can now be directly installed and used.

[0040] Step 3: Construction of building ground concrete.

[0041] Step 4: When the concrete strength can ensure that its surface and edges will not be damaged by demoulding, remove the side template 11. First, remove the main body of the side template 11. The positioning plate 111 and the rectangular template 112 on one side of the side template 11 are removed together with the side template. At this time, the U-shaped template 113 is still stuck in the concrete. Figure 5 and then use the shape characteristics of the U-shaped template 113, pinch the open end, the U-shaped template 113 and the concrete separation, remove the U-shaped template 113, as Figure 6As shown. By setting the U-shaped formwork 113, the main part of the side formwork can be removed from the concrete first. Since the front end of the U-shaped formwork is stuck in the concrete and is tightly bonded to the concrete, it is easy to damage the concrete at the front end of the U-shaped formwork if it is directly extracted with the side formwork. Therefore, the U-shaped formwork and the side formwork 11 are connected in a snap-fit manner. When the main part of the side formwork 11 is removed, it is not easy to affect the concrete at the front end of the U-shaped formwork. The U-shaped formwork is made of steel and has a certain degree of elasticity. It can be easily separated from the concrete by squeezing the U-shaped formwork, and then it is easily removed from the concrete without damaging the concrete at its front end.

[0042] Step 5: Treat the concrete construction joints, remove the surface slurry and stones, and lay out the lines according to the building partition joint position 14, and cut the partition joints. Before the construction of the next section of cement concrete building floor, brush a layer of plain cement slurry on the joint surface to strengthen the combination of new and old concrete, such as Figure 7 and Figure 8 shown.

[0043] Step 6: Carry out the construction of the next section of cement concrete building floor 13 according to the above requirements, and cut the side seams of the newly poured concrete at the partition joints to ensure the required width and depth of the partition joints. Finally, carry out the partition joint caulking construction according to the design requirements. Figures 9-11 shown.

[0044] The above method is used to leave construction joints and make expansion joints in the construction of cement concrete building floors, so that the construction joints and expansion joints in the building floors are effectively combined and the aesthetic effect of the construction joints is guaranteed.

[0045] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiment without creative contribution as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A construction method for leaving construction joints as partition joints in cement concrete floor construction, characterized in that: Including steps: Determine the construction sections and sequence based on the division of the building ground surface layer into sections; The construction of the building ground reinforcement binding and the installation of the side formwork are carried out according to the construction section and construction sequence. The side formwork is installed outside the partition joint position. A horizontal positioning plate extending to the bottom position of the partition joint is fixed on the side formwork. A rectangular formwork is fixed on the side formwork above the positioning plate. A U-shaped formwork is sleeved on the positioning plate. The upper surface of the U-shaped formwork is in contact with the lower surface of the rectangular formwork, and the width of the U-shaped formwork is greater than the width of the rectangular formwork. Building floor concrete construction; When the concrete strength reaches the requirements for formwork removal, the side formwork is removed. The rectangular formwork and positioning plate are removed together with the side formwork first; then the U-shaped formwork is squeezed to separate it from the concrete and removed; Carry out concrete construction joint treatment, lay out and locate the construction joints according to the location of the building partition joints, and cut the partition joints to the grooves left by the U-shaped formwork; Carry out the construction of the next section of the building ground, and cut the new concrete side at the expansion joint to ensure the expansion joint width and depth requirements, and finally carry out the expansion joint caulking construction according to the design requirements.

2. the construction method of leaving a construction joint and making a lattice joint in cement concrete floor construction as claimed in claim 1 is characterized in that: The lateral template is installed 10mm to 20mm outside the partition joint position.

3. the construction method of leaving a construction joint and making a lattice joint in cement concrete floor construction as claimed in claim 1 is characterized in that: During the process of treating concrete construction joints, remove surface slurry and gravel.

4. the construction method of leaving a construction joint and making a lattice joint in cement concrete floor construction as claimed in claim 1 is characterized in that: Before construction of the next section of the building floor, brush a layer of plain cement slurry on the joint surface of the previous section of the building floor to strengthen the bond between the new and old concrete.

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