Cylindrical wood formwork assembly
By introducing steel longitudinal reinforcements and positioning hooks into the cylindrical wooden formwork, the problem of cracking at the joints of the formwork was solved, construction quality and efficiency were improved, grout leakage was reduced, and reliance on large mechanical equipment was decreased.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-18
- Publication Date
- 2026-04-07
AI Technical Summary
When the concrete pumping speed is too fast or the tilting height exceeds 2 meters, the instantaneous pressure of the cylindrical wooden formwork surges, causing sudden cracking at the joint and affecting the construction quality.
The mechanical strength of the formwork is enhanced by steel longitudinal reinforcements, and the stability of the formwork joints and the force direction are consistent with the lateral pressure of the concrete through the design of positioning hooks and fastening straps. T-bolts and steel strap clamps are used for locking.
It effectively prevents cracking at the joints of the formwork, improves construction quality and efficiency, reduces grout leakage, and reduces reliance on large machinery and equipment.
Smart Images
Figure CN224092975U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to road and bridge construction tool technical field, concretely relates to a kind of cylindrical wood formwork assembly for the pouring construction of bridge column, pier and other cylindrical structures. BACKGROUND
[0002] Cylindrical wood formwork usually adopts high-quality wood such as birch poplar, pine as base material, and is made into multi-layer plywood through high-temperature and high-pressure process to ensure the strength and toughness of the formwork. The inner and outer surfaces of the formwork are covered with epoxy resin film or waterproof phenolic glue to improve the waterproof and moisture-proof performance of the formwork, and at the same time, the surface of the poured concrete is smooth and flat, achieving the effect of "fair-faced concrete". Compared with steel formwork, cylindrical wood formwork is lighter in weight, easy to carry and install by hand, and does not require large mechanical equipment (such as cranes) for assistance, thus being more efficient in construction.
[0003] The formwork is designed with a unique concave-convex structure in the longitudinal direction, and two pieces of formwork can be seamlessly buckled to avoid the problem of joint leakage and ensure the quality of concrete pouring. However, when the concrete pumping speed is too fast or the pouring height is > 2m, it will cause a sudden increase in instantaneous pressure (up to 1.2-1.5 times the static pressure) at the joint (abutting point), accompanied by a "bursting" sound. SUMMARY
[0004] In view of the above problems, the present utility model is proposed to provide a cylindrical wood formwork assembly that overcomes the above problems or at least partially solves them.
[0005] The cylindrical wood formwork assembly comprises a cylindrical wood formwork body, a fastening band, and a steel longitudinal reinforcing member. The cylindrical wood formwork body comprises two half-cylinder wood formworks, which are abutted to form a cylindrical pouring space. The half-cylinder wood formworks are provided with an insertion block and an insertion slot extending in the longitudinal direction at the two abutting ends, respectively. The number of steel longitudinal reinforcing members is two, and the inner arc-shaped wall surfaces of the two steel longitudinal reinforcing members are tightly attached to the outer wall surfaces of the abutting points of the two half-cylinder wood formworks. The length of the steel longitudinal reinforcing member is the same as that of the half-cylinder wood formwork. The fastening band is wrapped around the outer wall surface of the cylindrical wood formwork body and the outer wall surface of the steel longitudinal reinforcing member to lock the positions of the half-cylinder wood formwork and the steel longitudinal reinforcing member. The outer wall surface of the cylindrical wood formwork body is fixed with at least three positioning hooks opening upward at the same height, and the fastening band is inserted into the positioning hooks at the same height.
[0006] In one embodiment, the positioning hook comprises a base portion fixedly connected to the outer wall surface of the cylindrical wood formwork body, a connecting portion extending away from the cylindrical wood formwork body from the top end of the base portion, and a blocking portion extending upward from the top end of the connecting portion.
[0007] In one embodiment, four positioning groups are fixed on the outer wall of the cylindrical wooden template body. Each positioning group consists of two positioning blocks located at the same height and adjacent to the transverse two-sided edges of the steel longitudinal reinforcement. The same steel longitudinal reinforcement is constrained by two positioning groups at different heights.
[0008] In one embodiment, the fastening band is a T-bolt steel band clamp, and the number of such clamps is greater than or equal to two.
[0009] In one embodiment, a waterproof rubber pad is provided at the joint of the semi-circular wooden template between the insert and the slot.
[0010] This utility model relates to a cylindrical wooden formwork assembly. It utilizes longitudinal steel reinforcements to enhance the mechanical strength of the assembly and provide effective support at the joint of the two semi-circular wooden formwork halves. This addresses the problem of sudden cracking at the joint caused by a sudden surge in pressure (up to 1.2 to 1.5 times the static pressure) when concrete pumping speed is too fast or the pouring height exceeds 2m. Positioning hooks facilitate horizontal installation of the fastening straps, ensuring that the force direction of the steel straps aligns with the direction of the lateral pressure from the concrete, maximizing material efficiency and ensuring construction quality. Attached Figure Description
[0011] The accompanying drawings, which form part of the specification, are used to provide a further understanding of the embodiments of this application and illustrate the implementation methods of this application, together with the textual description, to explain the principles of this application. Obviously, the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings:
[0012] Figure 1 This is a schematic diagram of an exemplary embodiment of a cylindrical wooden formwork assembly according to the present invention;
[0013] Figure 2 This is an exploded view of the main body of the cylindrical wooden formwork;
[0014] Figure 3 This is a schematic diagram showing the interaction between the positioning hook and the fastening strap;
[0015] Figure 4 This is a schematic diagram of the location block distribution.
[0016] Explanation of reference numerals in the attached drawings: 1. Main body of cylindrical wooden formwork; 2. Fastening strap; 3. Steel longitudinal reinforcement; 4. Semi-circular wooden formwork; 5. Insert block; 6. Slot; 7. Positioning hook; 8. Base; 9. Connecting part; 10. Stop; 11. Positioning block. Detailed Implementation
[0017] The embodiments of this utility model are described in detail below, with examples of the embodiments shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. Those skilled in the art can make various changes, modifications, substitutions, and alterations to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the claims and their equivalents.
[0018] The terms “center,” “longitudinal,” “transverse,” “length,” “upper,” “lower,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “axial,” “radial,” and “circumferential,” mentioned or possibly mentioned in the description of this utility model, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, the terms "comprising," "including," and any variations thereof are intended to cover non-exclusive inclusion.
[0020] A cylindrical wooden formwork assembly according to an embodiment of the present invention is described below with reference to the accompanying drawings.
[0021] See Figure 1 According to an embodiment of the present utility model, a cylindrical wooden formwork assembly comprises a cylindrical wooden formwork body 1, a fastening band 2, and a steel longitudinal reinforcement 3.
[0022] See now Figure 1 and Figure 2The cylindrical wooden formwork body 1 includes two semi-circular wooden formworks 4, which are joined together to form a cylindrical pouring space. The semi-circular wooden formworks 4 can be made of high-quality wood such as birch, poplar, or pine, using a multi-layer plywood manufactured through a high-temperature and high-pressure process. Of course, the semi-circular wooden formworks 4 can also be made of other suitable materials, which will not be listed here. The semi-circular wooden formworks 4 have longitudinally extending inserts 5 and slots 6 at their two joint ends. When the two semi-circular wooden formworks 4 are joined, the two inserts 5 extend into the corresponding slots 6. The cooperation of the inserts 5 and slots 6 can reduce or even prevent grout leakage at the joint during concrete pouring.
[0023] In one embodiment, a waterproof rubber pad is provided at the joint of the semi-circular wooden template 4 between the insert block 5 and the slot 6 to further prevent grout leakage at the joint during concrete pouring.
[0024] See now Figure 1 The steel longitudinal stiffeners 3 are two in number. The inner arc-shaped walls of the two steel longitudinal stiffeners 3 are respectively in close contact with the outer walls of the joint of the two semi-circular wooden formwork 4, and the length of the steel longitudinal stiffeners 3 is the same as the length of the semi-circular wooden formwork 4. The steel longitudinal stiffeners 3 can not only strengthen the mechanical strength of the cylindrical wooden formwork assembly, but also provide effective support for the joint of the two semi-circular wooden formwork 4, so as to solve the problem of sudden collapse at the joint caused by the instantaneous pressure surge (up to 1.2 to 1.5 times the static pressure) when the concrete pumping speed is too fast or the pouring height is >2m.
[0025] The fastening straps 2 are wrapped around the outer wall of the cylindrical wooden formwork body 1 and the outer wall of the steel longitudinal reinforcement 3, used to lock the position of the semi-circular wooden formwork 4 and the steel longitudinal reinforcement 3, and to resist circumferential tensile force. The number of fastening straps 2 is greater than or equal to two, and the specific number can be determined according to the height of the cylindrical wooden formwork body 1 and the pressure it bears during the concrete pouring process. The fastening straps 2 can be T-bolt steel strap clamps, which can be operated by one person with one hand, resulting in high installation efficiency.
[0026] See now Figure 1 and Figure 3 The outer wall of the cylindrical wooden formwork body 1 is fixed with at least three detachable, upward-facing positioning hooks 7 at the same height, and the fastening straps 2 extend into the positioning hooks 7 at the same height. The positioning hooks 7 facilitate horizontal installation of the fastening straps 2 by installers. During transport or storage of the semi-circular wooden formwork 4, the positioning hooks 7 can be removed for easy stacking of the semi-circular wooden formwork 4.
[0027] The positioning hook 7 may include a base 8 fixedly connected to the outer wall of the cylindrical wooden formwork body 1, a connecting portion 9 extending from the top of the base 8 away from the cylindrical wooden formwork body 1, and a stop portion 10 extending upward from the top of the connecting portion 9. The positioning hook 7 can be adhered to the outer wall of the cylindrical wooden formwork body 1 using hot melt adhesive, epoxy resin, or similar materials. Specifically, the base 8 can be adhered to the outer wall of the cylindrical wooden formwork body 1 using hot melt adhesive, epoxy resin, or similar materials. The positioning hook 7 is preferably made of a hard metal material.
[0028] In this embodiment, four sets of positioning groups are fixed to the outer wall surface of the cylindrical wooden template body 1. See now. Figure 4 The positioning group consists of two positioning blocks 11 located at the same height and adjacent to the transverse edges of the steel longitudinal stiffener 3. The same steel longitudinal stiffener 3 is constrained by two positioning groups at different heights. Similarly, the positioning blocks 11 can be glued to the outer wall of the cylindrical wooden formwork body 1 using hot melt adhesive, epoxy resin, etc. During transport or storage of the semi-circular wooden formwork 4, the positioning blocks 11 can be disassembled to facilitate the stacking of the semi-circular wooden formwork 4. The positioning blocks 11 are preferably made of hard metal material.
[0029] In this embodiment, the cylindrical wooden formwork assembly utilizes steel longitudinal stiffeners 3 to enhance the mechanical strength of the assembly and provide effective support at the joint of the two semi-circular wooden formwork halves 4. This addresses the problem of sudden cracking at the joint caused by a sudden surge in pressure (up to 1.2 to 1.5 times the static pressure) when the concrete pumping speed is too fast or the pouring height exceeds 2m. Positioning hooks 7 are provided to facilitate horizontal installation of the fastening straps 2 by installers, ensuring that the force direction of the steel straps is aligned with the direction of the lateral pressure of the concrete, maximizing material efficiency and ensuring construction quality.
Claims
1. A cylindrical wooden formwork assembly, characterized in that: The system includes a cylindrical wooden formwork body, fastening straps, and steel longitudinal reinforcements. The cylindrical wooden formwork body comprises two semi-circular wooden formworks, which are joined together to form a cylindrical casting space. Each semi-circular wooden formwork has longitudinally extending inserts and slots at its two joint ends. Two steel longitudinal reinforcements are included, with their inner arc-shaped walls tightly abutting the outer walls of the joint between the two semi-circular wooden formworks. The length of each steel longitudinal reinforcement is the same as the length of the semi-circular wooden formwork. The fastening straps surround the outer walls of the cylindrical wooden formwork body and the steel longitudinal reinforcements, used to lock the positions of the semi-circular wooden formworks and the steel longitudinal reinforcements. At least three detachable, upward-facing positioning hooks are fixed at the same height on the outer wall of the cylindrical wooden formwork body, and the fastening straps extend into these positioning hooks at the same height.
2. The cylindrical wooden formwork assembly according to claim 1, characterized in that: The positioning hook includes a base that is fixedly connected to the outer wall of the cylindrical wooden template body, a connecting part that extends from the top of the base away from the cylindrical wooden template body, and a stop that extends upward from the top of the connecting part.
3. The cylindrical wooden formwork assembly according to claim 2, characterized in that: The outer wall of the cylindrical wooden formwork body is fixed with four sets of positioning groups. Each positioning group consists of two positioning blocks located at the same height and adjacent to the transverse two-sided edges of the steel longitudinal reinforcement. The same steel longitudinal reinforcement is constrained by two sets of positioning groups at different heights.
4. The cylindrical wooden formwork assembly according to claim 3, characterized in that: The fastening band is a T-bolt steel band clamp, and the number of them is greater than or equal to two.
5. The cylindrical wooden formwork assembly according to claim 4, characterized in that: The semi-circular wooden template joint is provided with a waterproof rubber pad located between the insert and the slot.