A mold for concrete member hole reservation

Abstract

The utility model discloses a mould for concrete member hole reservation, its characterized in that, including lower end mould, relay mould, upper end mould, water stop strip reservation convex edge, lower end mould and relay mould are the vertical through cylinder structure in the inside, and the upper end mould is the groove body structure that top is open and section presents inverted trapezoid, and the ring of relay mould bottom end up and down sliding is set in lower end mould top outside, and relay mould top and upper end mould bottom intercommunication, thereby make upper end mould, relay mould and lower end mould up and down through -connection and form the whole, and water stop strip reservation convex edge surrounds relay mould and is set in upper end mould bottom, the utility model solves the problem that the wood mould reservation hole exists in the prior art shape is not identical, surface is rough, structural safety and water stop are insufficient, and the problem that reinforcing bar pre -buried is complicated.

Description

Technical Field

[0001] This utility model belongs to the field of building construction technology, specifically relating to a mold for pre-reserving holes in concrete components. Background Technology

[0002] In modern building construction, it is common practice to pre-drill holes in floor slabs or other concrete components. These holes serve two purposes: first, they act as vertical measurement access points to ensure accuracy in subsequent measurement, positioning, and installation processes; second, they allow for the installation of pipes to facilitate concrete pouring. Traditionally, wooden formwork (wooden molds) is used for pre-drilling these holes. However, wooden formwork is susceptible to environmental humidity and construction site conditions, exhibiting the following main drawbacks: 1. The shape and size of the reserved holes are inconsistent. During the processing, cutting, and on-site erection of wooden molds, the shape and size of the reserved holes often vary greatly due to the dimensional deviation of the wood itself, errors in on-site construction operations, and wear after repeated use of the wooden molds. This makes it impossible to meet the requirements for high-precision vertical measurement and positioning.

[0003] 2. Rough surface quality Wooden molds are usually not finely treated, and their edges are prone to burrs, cracks, and unevenness. After concrete is poured, the rough surface of the hole edges not only affects the stable placement of subsequent measuring instruments, but also hinders good contact between the cast-in-place structure and the instruments.

[0004] 3. Poor water stopping performance Wooden formwork is difficult to form a continuous and stable waterproof structure at the interface between the formwork and the concrete. Due to the water absorption and expansion and drying shrinkage characteristics of wood, waterproof materials (such as wooden wedges and waterstop strips) are often difficult to keep sealed, which leads to moisture seeping around the holes later, easily causing quality problems such as steel corrosion and concrete spalling.

[0005] 4. Complex steel reinforcement pre-embedding In situations where reinforcement bars are needed around the openings, the holes in the wooden formwork often need to be pre-drilled manually on the formwork or drilled after the concrete is poured. This process is cumbersome and does not match the time of formwork removal, which can easily cause construction delays or secondary damage to the original floor slab structure.

[0006] 5. Insufficient environmental protection and sustainability The use of a large number of wooden molds on site not only consumes a lot of timber resources, but also results in a low wood recycling rate after demolding, which easily leads to waste; at the same time, sawdust, adhesive residues and other residues also increase the difficulty of cleaning the construction site and the risk of environmental pollution.

[0007] Based on the aforementioned shortcomings of existing technologies, there is an urgent need for a new type of mold that can achieve consistent hole shape and size, smooth and flat surface, high-strength bonding with the original floor slab and post-cast structure, good water-stopping performance, and simplify the steel reinforcement pre-embedding process, while meeting the requirements of environmental protection and sustainable development. Utility Model Content

[0008] To address the shortcomings of existing technologies that use wooden molds for pre-reserving holes, such as inconsistent shapes, rough surfaces, insufficient structural safety and water-stopping properties, and cumbersome steel reinforcement embedding, this utility model provides a mold for pre-reserving holes in concrete components.

[0009] This utility model is achieved through the following technical solution.

[0010] A mold for pre-drilling holes in concrete components, characterized in that it includes a lower mold, a secondary mold, an upper mold, and a pre-drilled protrusion for a waterstop strip; the lower mold and the secondary mold are internally vertically connected cylindrical structures, and the upper mold is a groove structure with an open top and an inverted trapezoidal cross-section; a ring that can slide up and down at the bottom of the secondary mold is set outside the top of the lower mold, and the top of the secondary mold is connected to the bottom of the upper mold, thereby connecting the upper mold, the secondary mold, and the lower mold vertically into a whole; the pre-drilled protrusion for the waterstop strip is set around the secondary mold at the bottom of the upper mold.

[0011] Preferably, a connecting plate is provided at the corner of the bottom of the lower mold, and nail holes are provided on the connecting plate.

[0012] Preferably, the present invention also includes two leaf cover plates symmetrically hinged at the open end of the top of the upper mold, and handles are provided on the upper surface of the two leaf cover plates.

[0013] Preferably, the present invention also includes two cover plates, which are symmetrically hinged at the top open end of the upper mold to cover the top open end of the upper mold, and the upper surface of the two cover plates is provided with handles.

[0014] Preferably, the present invention also includes a plurality of anchor hole reserved bolts symmetrically arranged inside the lower mold, the anchor hole reserved bolts being threadedly connected to the side wall of the lower mold and being able to be screwed into the outside of the lower mold.

[0015] Preferably, the bottom port of the lower mold is recessed inward to form an annular groove.

[0016] Preferably, the lower mold, intermediate mold, and upper mold are all made of rigid plastic.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. Significantly improved hole quality and consistency Using this new type of mold enables mass production, standardization, and rapid on-site installation, ensuring that the shape, diameter, and depth of each pre-drilled hole are highly consistent. Compared to traditional wooden molds, its error can be controlled within ±1 mm, significantly reducing the number of construction adjustments and rework rates, and improving measurement and positioning accuracy and subsequent installation efficiency.

[0018] 2. Smooth surface and neat edges The holes formed by the mold in this invention have smooth, flat edges, avoiding the burrs and cracks commonly found when removing wooden molds. No additional repairs are needed after concrete pouring to meet the installation and connection requirements of measuring equipment or pipelines, shortening the construction cycle and reducing labor costs.

[0019] 3. The structural bond strength is significantly enhanced. Through the dual mechanical and physical interlocking of the stair-and-mortise structure and the waterstop strip, the interface between the post-cast concrete and the original floor slab achieves a dual guarantee of "multi-point interlocking + interface bonding". Experiments show that this utility model mold helps to increase the bond strength between the post-cast body and the initial cast body by more than 20%, significantly improving the load-bearing capacity of the area around the hole and the overall structural safety.

[0020] 4. Excellent seepage prevention performance According to on-site water seepage tests, the amount of water seepage using the pre-reserved holes in the mold of this utility model, after subsequent sealing, is reduced by more than 80% compared to traditional methods, and can maintain the anti-seepage and sealing effect for a long time, reducing the risk of steel corrosion and concrete spalling caused by water intrusion in the later stage.

[0021] 5. Reinforcing bar pre-embedding is quick and convenient. This invention forms anchoring holes by pre-reserving bolts in the anchor holes, eliminating the need for secondary drilling. Field data shows that the time for pre-embedding reinforcing bars is reduced by about 30% compared to the traditional method, while ensuring that the positional deviation of the reinforcing bars is ≤2 mm, thus improving construction efficiency and quality.

[0022] 6. Environmentally friendly and sustainable utilization This utility model mold has a standard cycle life of over 200 cycles, significantly reducing wood consumption and on-site waste generation. Used molds can be reused or processed for energy generation using plastic recycling systems, aligning with green construction and sustainable development principles.

[0023] 7. Significant overall economic benefits By improving the quality of hole construction, shortening the installation and demolding cycle, and reducing rework and material waste, this utility model can save about 15% to 20% of labor costs and about 10% to 15% of material costs in the hole reservation construction of a million-square-meter building project, resulting in significant overall cost benefits. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of this invention, the accompanying drawings used in some embodiments of this invention will be briefly described below. Obviously, the drawings described below are only drawings of some embodiments of this invention, and those skilled in the art can obtain other drawings based on these drawings. Furthermore, the drawings described below can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual flow of the method, the actual timing of the signals, etc. involved in the embodiments of this invention.

[0025] Figure 1 This is a schematic diagram of the main structure of the mold of this utility model; Figure 2 This is the front view of the mold of this utility model; Figure 3 This is a top view of the mold of this utility model (with the cover plate omitted). Figure 4 This is a bottom view of the mold of this utility model; Figure 5 This is a top view of the mold of this utility model; Figure 6 This is a three-dimensional structural diagram of the mold of this utility model (with the cover plate omitted). Figure 7 This is a schematic diagram of the mold installation process for this utility model; Figure 8 This is a schematic diagram of the mold disassembly process of this utility model; Figure 9 This is a schematic diagram of pre-drilled holes in a floor slab using the mold of this utility model; Figure 10 This is a schematic diagram illustrating the process of sealing a pre-reserved hole. The meanings of the markings in the above figure are as follows: lower mold 1, connecting plate 101, anchor hole reserved bolt 102, annular groove 103, intermediate mold 2, top support bolt 201, upper mold 3, waterstop strip reserved protrusion 4, cover plate 5, handle 501, floor slab bottom mold 6, steel reinforcement cage 7, reinforcing steel 8, rubber waterstop ring 9, support base 10, post-cast bottom mold for hole 11, waterstop ring installation groove 12, anchor hole 13. Detailed Implementation

[0026] The technical solutions in some embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments provided by the present invention are within the scope of protection of the present invention. Example 1

[0027] A mold for pre-drilling holes in concrete components; please refer to [link / reference]. Figures 1 to 6The system includes a lower mold 1, a secondary mold 2, an upper mold 3, and a pre-reserved protruding edge 4 for the waterstop strip. The lower mold 1 and the secondary mold 2 are internally vertically connected cylindrical structures, while the upper mold 3 is a groove structure with an open top and an inverted trapezoidal cross-section. The bottom surface of the upper mold 3 and the bottom of the secondary mold 2 are connected by a sliding ring outside the top of the lower mold 1. The top of the secondary mold 2 is connected to the bottom of the upper mold 3, thus enabling the upper mold 3, the secondary mold 2, and the lower mold 1 to be coaxially connected as a whole. The pre-reserved protruding edge 4 for the waterstop strip is set around the secondary mold 2 at the bottom of the upper mold 3. Depending on the depth of the reserved hole or the thickness of the concrete component, the secondary mold 2 is set outside the top of the lower mold 1 through the sliding ring, so that the overall height of the mold is adjustable. The height adjustment range is usually controlled within 10-30mm to meet the construction tolerance of ±5mm. The width and height of the pre-reserved protruding edge 4 for the waterstop strip are matched with the dimensions of commercially available rubber waterstop strips.

[0028] Furthermore, in a preferred embodiment, a connecting plate 101 is provided at the corner of the bottom of the lower mold 1, and nail holes are provided on the connecting plate 101; based on this structure, during construction, iron nails can be driven into the nail holes of the connecting plate 101 to make the mold easy to fix on the wooden template.

[0029] Furthermore, in a preferred embodiment, the present invention also includes two cover plates 5, which are symmetrically hinged at the open end of the upper mold 3 to cover the open end of the upper mold 3. The upper surface of the two cover plates 5 is provided with handles 501. Based on this structure, when pouring concrete components, the two cover plates can be covered to close the open end of the upper mold 3, preventing concrete from flowing into the mold. When the concrete component initially sets, the two cover plates can be opened, and the mold can be removed from the concrete component through the handles 501, thus eliminating the need to use pry bars or special tools to dismantle the mold, thereby simplifying the demolding process. At the same time, when the mold is not removed, the cover plates can also prevent workers from accidentally stepping into the mold and causing safety hazards.

[0030] Furthermore, in a preferred embodiment, a top support bolt 201 is threadedly connected to the inner top of the lower mold 1. The screw-in end of the top support bolt 201 abuts against the inner wall of the intermediate mold 2 to fix the position of the intermediate mold 2 looped on the lower mold 1. Based on this structure, when the overall height of the mold is required, the top support bolt 201 can be loosened first, and then the intermediate mold 2 can be slid up and down to make it loop in the appropriate position of the lower mold 1. Then the top support bolt 201 can be tightened to complete the fixation of the mold height.

[0031] Furthermore, in a preferred embodiment, the present invention also includes a plurality of anchor hole pre-reserved bolts 102 symmetrically arranged inside the lower mold 1. The anchor hole pre-reserved bolts 102 are threadedly connected to the side wall of the lower mold 1 and can be screwed into the outside of the lower mold 1. Based on this structure, when pouring concrete components, the anchor hole pre-reserved bolts 102 can be screwed outward a certain distance first, so that the anchor hole pre-reserved bolts 102 occupy the position to form anchor holes for installing reinforcing bars when filling the reserved holes later.

[0032] Furthermore, in a preferred embodiment, the bottom port of the lower mold 1 is recessed inward to form an annular groove 103; based on this structure, when pouring concrete components, the recessed annular groove 103 allows a support pedestal 10 to be formed at the bottom of the reserved hole when the mold is removed to form the reserved hole, so that the post-cast bottom mold 11 of the reserved hole can be directly installed on the support pedestal 10 from above the reserved hole.

[0033] Furthermore, in a preferred embodiment, the lower mold 1, the intermediate mold 2, and the upper mold 3 are made of rigid plastic, wherein the rigid plastic is selected from corrosion-resistant modified polypropylene (PP) or high-density polyethylene (HDPE) materials. These materials have high strength, good rigidity, and excellent weather resistance, and can be used repeatedly for a long time in open-air and high-humidity environments. Example 2

[0034] To illustrate and demonstrate the beneficial effects or working principle of this utility model, this embodiment takes the example of pre-reserving holes in a concrete floor slab, and further provides a method for using the mold described in Embodiment 1, as follows: 1. Digital Model Export: Before construction, export the hole layout scheme of the floor slab in the Building Information Model (BIM), including the location coordinates, elevation and specifications of the holes.

[0035] 2. On-site layout: Based on the digital model, mark the center points of each hole on the floor slab using a total station or GNSS measuring equipment; use a level to check the elevation to ensure that the layout deviation does not exceed ±2mm.

[0036] 3. Mold Installation: Please refer to [link / reference]. Figure 7Apply a release agent to the outer surface of the mold. Place the mold on the bottom mold 6 of the floor slab according to the layout position of the hole. Open the cover plate 5 and fix the mold on the bottom mold 6 of the floor slab by nailing iron nails into the nail holes of the connecting plate 101, ensuring that the bottom of the lower mold 1 is in close contact with the surface of the bottom mold 6 of the floor slab and the level deviation is <1mm. Then, loosen the top support bolt 201 and slide the intermediate mold 2 up and down so that it is fitted in the appropriate position of the lower mold 1. Tighten the top support bolt 201 to control the height of the mold to meet the depth requirement of the reserved hole, i.e., the thickness requirement of the floor slab. Screw the anchor hole reserved bolt 102 outward a certain distance so that the anchor hole reserved bolt 102 occupies the position to form the anchor hole for installing the reinforcing steel bar 8. In order to facilitate the later unscrewing of the anchor hole reserved bolt 102, after the anchor hole reserved bolt 102 is screwed outward, its exposed end can be covered with waste paper. Close the cover plate 5. 4. Installation of floor slab reinforcement cage: Install the reinforcement cage 7 on the bottom formwork 6 of the floor slab using conventional methods; 5. Concrete pouring and vibration: Concrete meeting the design strength requirements is used to pour the floor slab and then vibrates it to compact it. 6. Initial setting and demolding: Please refer to [link / reference needed]. Figure 8 After the floor slab concrete has initially set, open the cover plate 5, loosen the top support bolts 201 and unscrew the anchor hole pre-drilled bolts 102. Using handle 501, first remove the intermediate formwork 2 and the upper formwork 3 from the floor slab concrete, and then remove the lower formwork 1. At this point, please refer to... Figure 9 This means that holes are pre-reserved at the designed locations in the floor slab for use as vertical measurement access points or for pipe installation later; in addition, the holes not only have a stepped tongue and groove structure, which can enhance the interlocking effect between the post-poured concrete and the floor slab concrete when sealing the holes, but also form a water-stop ring installation groove 12, anchoring hole 13 and support base 10 in the holes to improve the convenience and sealing effect of subsequent hole sealing; 7. Cavity sealing: Please refer to Figure 10 An interface agent is applied inside the hole to enhance the bond between the post-cast concrete and the initial-cast concrete. A rubber waterstop ring 9 is installed in the waterstop strip installation groove to prevent seepage and seal between the post-cast concrete and the floor slab concrete. The rubber waterstop ring 9 is made of bentonite-polymer composite material, which can expand adaptively after installation to fill the tiny gaps between the new and old concrete. The bottom formwork 11 for post-casting of the hole is installed on the support base 10. Reinforcing steel bars 8 are installed in the anchoring holes to improve the connection strength between the post-cast concrete and the floor slab concrete. Concrete is poured in layers according to the remaining height of the hole depth and is vibrated to compact it. After the concrete has initially set, the surface of the hole opening is finished with a wooden trowel or power trowel to ensure that the surface is flat and smooth.

Claims

1. A mold for pre-drilling holes in concrete components, characterized in that, It includes a lower mold (1), a relay mold (2), an upper mold (3), and a pre-reserved protrusion (4) for the waterstop strip; the lower mold (1) and the relay mold (2) are internally vertically connected cylindrical structures, and the upper mold (3) is a groove structure with an open top and an inverted trapezoidal cross section; the ring at the bottom of the relay mold (2) is set outside the top of the lower mold (1), and the top of the relay mold (2) is connected to the bottom of the upper mold (3), so that the upper mold (3), the relay mold (2) and the lower mold (1) are connected vertically to form a whole; the pre-reserved protrusion (4) for the waterstop strip is set around the relay mold (2) at the bottom of the upper mold (3).

2. The mold for pre-drilling holes in concrete components as described in claim 1, characterized in that, A connecting plate (101) is provided at the corner of the bottom of the lower mold (1), and nail holes are provided on the connecting plate (101).

3. A mold for pre-drilling holes in concrete components as described in claim 1, characterized in that, It also includes two leaf cover plates (5), which are symmetrically hinged at the top open end of the upper mold (3) to cover the top open end of the upper mold (3), and the upper surface of the two leaf cover plates (5) is provided with handles (501).

4. A mold for pre-drilling holes in concrete components as described in claim 1, characterized in that, The lower mold (1) has a top threaded connection to a top support bolt (201). The screw-in end of the top support bolt (201) abuts against the inner wall of the intermediate mold (2) to fix the position of the intermediate mold (2) ring on the lower mold (1).

5. A mold for pre-drilling holes in concrete components as described in claim 1, characterized in that, It also includes several anchor hole reserved bolts (102) symmetrically arranged inside the lower mold (1). The anchor hole reserved bolts (102) are threadedly connected to the side wall of the lower mold (1) and can be screwed into the outside of the lower mold (1).

6. A mold for pre-drilling holes in concrete components as described in claim 1, characterized in that, The bottom port of the lower mold (1) is recessed inward to form an annular groove (103).

7. A mold for pre-drilling holes in concrete components as described in claim 1, characterized in that, The lower mold (1), the intermediate mold (2) and the upper mold (3) are all made of hard plastic.

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