A combined assembling mould for rapid batch production of sand-free concrete precast blocks on site
By combining and assembling molds consisting of square timber, templates, and plywood, the problems of high mold cost, low efficiency, and large space occupation in the precast production of sand-free concrete are solved, enabling rapid mass production and flexible assembly.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SINOHYDRO BUREAU 11 CO LTD
- Filing Date
- 2025-05-12
- Publication Date
- 2026-06-16
AI Technical Summary
Existing precast concrete production methods suffer from problems such as high mold procurement costs, low production efficiency, and large on-site construction space requirements, making it difficult to achieve mass production.
A modular assembly mold consisting of square timber, templates, and plywood, including vertical template components, joint templates, and plywood components, is used to achieve mass production of sand-free precast concrete blocks through rapid assembly and disassembly.
It reduced mold procurement costs, improved production efficiency, reduced the space occupied on the construction site, and enabled the rapid mass production of sand-free precast concrete blocks.
Smart Images
Figure CN224360388U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of water conservancy engineering construction technology, specifically to a combination assembly mold for rapid on-site mass production of sand-free precast concrete blocks. Background Technology
[0002] No-fines concrete is a type of lightweight aggregate concrete, made only of water, cement, and coarse aggregate. Because it lacks fine aggregate, it contains numerous large pores. In some southern regions, no-fines concrete is used as a drainage system within the foundations of concrete dams to collect groundwater seeping up from the rock base and create drainage channels within the dam structure.
[0003] Traditional precast concrete production using no-fines formwork often employs standardized steel or wooden formwork. When the total production volume is small, standardized steel formwork suffers from high costs in purchasing and transporting molds, as well as poor adaptability to on-site size adjustments. Wooden formwork is relatively inexpensive and can be cut and assembled locally using existing materials. However, conventional formwork can only produce one precast block at a time, resulting in low production efficiency. Furthermore, the mold shape is fixed in traditional formwork solutions, and with large-scale demand, a large number of molds may occupy the working space on the construction site, affecting on-site construction.
[0004] In summary, the existing steel formwork procurement costs are high, while wooden formwork has a small production volume per batch, lacks flexibility, and is not conducive to mass production. Utility Model Content
[0005] The purpose of this utility model is to address the shortcomings of existing technologies by providing a combination assembly mold for rapid on-site mass production of sand-free precast concrete blocks, which enables mass production, offers high flexibility in on-site assembly, and has a high reusability rate.
[0006] To achieve the above objectives, the technical solution adopted by this utility model is: a combined assembly mold for rapid mass production of sand-free precast concrete blocks on site, comprising a pair of vertical template components, several joint templates, and several clamping plate components;
[0007] Each vertical template assembly includes a template back rib and several templates. The several templates are fixed to the side of the template back rib at equal intervals. In a pair of vertical template assemblies, the sides of the templates are facing each other and leaving a cavity spacing. The spacing between adjacent templates in a pair of vertical template assemblies is also facing each other to form several slots.
[0008] Several of the aforementioned seam templates are inserted one by one into each slot to form several mold cavities that enclose a rectangular space;
[0009] The clamping plate assembly includes a gantry clamp, tie bolts, and nuts. The gantry clamp is used to clamp onto the outside of the two vertical template assemblies, and the tie bolts and nuts are used to apply a preload to the gantry clamp.
[0010] Preferably, the template back reinforcement is one or at least two whole square timbers that are parallel to each other.
[0011] Preferably, the template is fixed by nailing wooden nails into the square timber.
[0012] Preferably, the length of the square timber is ≥3m.
[0013] Preferably, the side length of a single mold cavity is ≥300mm.
[0014] Preferably, the thickness of the template is ≥20mm.
[0015] Preferably, the thickness of the joint template is equal to the thickness of the template.
[0016] Preferably, the door-shaped clamp is a door-shaped wooden clamp.
[0017] Preferably, end caps are provided at both ends of the template back reinforcement, and a gap is left between the end caps and the adjacent template to form the slot.
[0018] Preferably, the cross-sectional shape of the mold cavity is square.
[0019] This utility model has substantial features and progress compared to the prior art. Specifically, this utility model uses on-site profiles such as square timber and templates to make combined molds. On the one hand, it can reduce the procurement cost of customized steel templates. On the other hand, compared with the individual construction of ordinary wooden templates, it can achieve mass production. When in use, it can be quickly assembled on-site. After use, it is convenient to disassemble and stack in a centralized manner, and occupies relatively less space. Attached Figure Description
[0020] Figure 1 This is a top view schematic diagram of a combination assembly mold for rapid mass production of sand-free precast concrete blocks on site, according to this utility model.
[0021] Figure 2 This is a cross-sectional view along the AA direction of a combination assembly mold for rapid mass production of sand-free precast concrete blocks on-site, according to this utility model.
[0022] Figure 3 This is a BB-direction cross-sectional view of a combination assembly mold for rapid mass production of sand-free precast concrete blocks in this utility model.
[0023] In the diagram: 1. Tie bolt; 2. Nut; 3. Portal clamp; 4. Plastic film; 5. Template backing; 6. Template; 7. Wooden nail; 8. Joint template; 9. Five-layer concrete. Detailed Implementation
[0024] The technical solution of this utility model will be further described in detail below through specific embodiments.
[0025] In this embodiment, the dimensions of the five-kill concrete block are 300*300*300mm as an example for illustration.
[0026] like Figures 1-3 As shown, a modular assembly mold for rapid mass production of precast concrete blocks without sand on-site includes a pair of vertical template components, several joint templates 8, and several clamping plate components.
[0027] Each vertical template component includes a template backing rib 5 and several templates 6. In this embodiment, the template backing rib 5 is made of square timber. The template backing rib is one or at least two whole square timbers that are parallel to each other and have a total length of ≥3m. The templates 6 are made of wood planks cut on site, and there are 8 of them. A total of 8 300*300*300mm mold cavities need to be formed.
[0028] Several templates 6 are fixed at equal intervals to the sides of the template back rib 5, and are secured by nailing wooden nails 7 into the square timber. In a pair of vertical template assemblies, the templates are positioned on opposite sides, leaving a cavity gap. The gaps between adjacent templates in the pair of vertical template assemblies are also opposite to each other, forming several slots. The total number of slots should be nine. Small pieces of wood can be cut at both ends of the template back rib 5 to serve as end caps. A gap is left between the end caps and the adjacent template to form the slots, creating the two outermost slots.
[0029] Several of the joint templates 8 are inserted one by one into each slot to form several mold cavities that enclose a rectangular space, in which no-fines concrete 9 is poured.
[0030] In this embodiment, the thickness of both template 6 and joint template 8 is ≥20mm.
[0031] The clamping plate assembly includes a gate-shaped clamp 3, tie bolts 1 and nuts 2. The gate-shaped clamp 3 is a gate-shaped wooden clamping plate. The gate-shaped clamp 3 is used to clamp onto the outside of the two vertical template assemblies. The tie bolts 1 and nuts 2 are used to apply pre-tightening force to the gate-shaped clamp 3.
[0032] Application example description:
[0033] This utility model was developed based on experiments conducted on the concrete construction of the dam for the upper reservoir civil engineering and metal structure installation project of the Yunxiao Pumped Storage Power Station in Fujian Province.
[0034] This project involves a roller-compacted concrete dam with a total length of 1305m and a height of 68.2m. Multiple sand-free drainage channels are installed at the bottom of the dam's concrete structure. The sand-free concrete blocks, measuring 300*300*300mm, are installed in their designed positions simultaneously with the dam foundation concrete pouring. Therefore, prefabricated concrete blocks must be placed on-site before the main dam concrete construction. Considering the relatively small total quantity of sand-free concrete blocks for this project, purchasing standardized steel formwork would result in high material costs. Traditional wooden formwork is inefficient, and the sand-free concrete block structure, lacking fine aggregate, contains numerous large pores within the concrete, thus failing to meet the requirement of a smooth overall appearance after demolding. Therefore, by utilizing existing construction materials such as templates and timber, a production mold for sand-free concrete blocks that can be quickly assembled on the construction site is designed. When prefabrication is required, it can be quickly assembled and formed. After the sand-free concrete is poured and solidified, the template can be disassembled and put into use. The disassembled molds can be collected and stored together, which can reduce the transportation costs of producing sand-free concrete blocks in the prefabrication yard and then transporting them to the site. At the same time, the disassembled molds will not occupy much construction space on site.
[0035] The modular mold is assembled from vertical template components, joint templates, and clamping plate components. The mold is 3m long and has 8 300*300*300 squares that can be used to produce precast blocks. It can produce 8 precast blocks at a time.
[0036] Overall, it consists of vertical template components on both sides and joint templates spliced together. The template size in the vertical template components is 300*300mm, the joint template size is 340*300mm, and the template thickness is 20mm. During assembly, ten 300*300mm single-sided templates are arranged with a 20mm gap. Then, two 3m long, 50*80mm square timbers are installed at the top and bottom of the outer side of the templates. The upper and lower timbers are tightly attached to the outer edge of the vertical templates. The screws are tightened with an electric screwdriver at a torque of 30N•m to fix the vertical templates and timbers together. After completion, the vertical templates on both sides are arranged with a 300mm gap. Then, nine 340*300mm joint templates are inserted into the 20mm slots reserved between the vertical templates on both sides. The tenons of the joint templates are aligned with the template slots and hammered into place until they are in close contact. The joint gap is checked to be <0.5mm. After assembly, a mold for producing eight no-fines concrete blocks is formed. Then, three wooden gate-shaped clamps are installed on the outside, and tie bolts are installed inside the gate-shaped clamps to fix the mold as a whole. A plastic film 4 is laid at the bottom before no-fines concrete pouring is carried out. The installation and disassembly are simple and can achieve rapid batch production on site.
[0037] Finally, it should be noted that: the preferred embodiments of this patent have been described in detail above, but this patent is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this patent.
Claims
1. A modular assembly mold for rapid on-site mass production of precast concrete blocks without sand, characterized in that: It includes a pair of vertical template assemblies, several joint templates, and several clamping plate assemblies; Each vertical template assembly includes a template back rib and several templates. The several templates are fixed to the side of the template back rib at equal intervals. In a pair of vertical template assemblies, the sides of the templates are facing each other and leaving a cavity spacing. The spacing between adjacent templates in a pair of vertical template assemblies is also facing each other to form several slots. Several of the aforementioned seam templates are inserted one by one into each slot to form several mold cavities that enclose a rectangular space; The clamping plate assembly includes a gantry clamp, tie bolts, and nuts. The gantry clamp is used to clamp onto the outside of the two vertical template assemblies, and the tie bolts and nuts are used to apply a preload to the gantry clamp.
2. The assembly mold for rapid mass production of precast concrete blocks without sand as described in claim 1, characterized in that: The template back reinforcement is one or at least two whole square timbers that are parallel to each other.
3. The assembly mold for rapid mass production of precast concrete blocks without sand as described in claim 2, characterized in that: The template is fixed by being nailed into the square timber with wooden nails.
4. The assembly mold for rapid mass production of precast concrete blocks without sand as described in claim 3, characterized in that: The length of the square timber is ≥3m.
5. The assembly mold for rapid mass production of precast concrete blocks without sand as described in claim 1, characterized in that: The side length of a single mold cavity is ≥300mm.
6. The assembly mold for rapid mass production of precast concrete blocks without sand as described in claim 1, characterized in that: The thickness of the template is ≥20mm.
7. The assembly mold for rapid mass production of precast concrete blocks without sand as described in claim 1, characterized in that: The thickness of the joint template is equal to the thickness of the template.
8. The assembly mold for rapid mass production of precast concrete blocks without sand as described in claim 1, characterized in that: The gate-shaped clamp is a gate-shaped wooden plywood.
9. The assembly mold for rapid mass production of precast concrete blocks without sand as described in claim 1, characterized in that: End caps are provided at both ends of the template back reinforcement, and a gap is left between the end caps and the adjacent template to form the slot.
10. The assembly mold for rapid mass production of precast concrete blocks without sand as described in claim 1, characterized in that: The cross-sectional shape of the mold cavity is square.