Method for inserting reinforcing bar into corner of lattice frame
By arranging and rotating insertion reinforcement bars to place locking heads diagonally outside the girder frames, the method enhances the stability and rigidity of girder frames in bed protection applications, addressing the issue of insufficient fixation when connected only at the sides.
Patent Information
- Application Number
- JP2023165944
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-09-27
- Publication Date
- 2025-04-08
AI Technical Summary
Existing bed protection methods using girder frames are insufficiently fixed when connected only at the sides, leading to instability.
A method of arranging insertion reinforcement bars near the corners of girder frames, rotating them, and placing the locking heads on a diagonal line outside the frame to enhance corner connectivity and stability.
The method improves the rigidity and stability of girder frames by connecting them at the corners, providing a more secure fixing mechanism for bed protection applications.
Smart Images
Figure 2025056459000001_ABST
Abstract
Description
[Technical field]
[0001] The present invention relates to a method for inserting reinforcing bars into the corners of a lattice frame in order to connect multiple lattice frames used in a bed protection construction method. [Background technology]
[0002] Since the ground of coasts, rivers (riverbeds), lakes, and rivers and lakes are subject to scouring by running water, various bed protection methods have been implemented. For example, Patent Document 1 describes a concrete block with a lattice frame, which is made by placing a cloth bag along the inner surface of a lattice frame made of wood assembled in stages in a lattice shape, pouring ready-mixed concrete into the cloth bag, and hardening it. Furthermore, it also describes that before the ready-mixed concrete is hardened, a substantially vertically elongated U-shaped insert reinforcing bar consisting of a substantially U-shaped locking head and a pair of substantially L-shaped hooking feet connected to the locking head is arranged on the side of the lattice frame. The arrangement is such that the hooking feet are embedded in the concrete, and the locking heads protrude outward from the side of the lattice frame. It is described that when such multiple lattice frames are installed on the ground such as a riverbed, the locking heads protruding outward from the sides of the lattice frames are connected to each other with connectors to fix the multiple lattice frames together (Patent Document 1, paragraph 0057, Figures 15 and 16). However, there is a disappointment that if the lattice frames are connected to each other only on their sides, they are not fixed to each other sufficiently.
[0003] Meanwhile, in a bed protection method in which concrete blocks are cast using a removable frame without using a lattice frame, Patent Document 2 describes arranging approximately vertically elongated U-shaped insert rebars at the four corners of the concrete block (Patent Document 2, paragraphs 0042 and 0045, Figures 4 and 6). Since no lattice frame is used, it is possible to arrange approximately vertically elongated U-shaped insert rebars at the corners of the concrete block. This method is preferable because the concrete blocks are connected at the four corners, which provides better fixation than a method in which lattice-framed concrete blocks are connected only on the sides.
[0004] [Patent Document 1] Patent No. 4844787 [Patent Document 2] JP 2008-62529 A Summary of the Invention [Problem to be solved by the invention]
[0005] The object of the present invention is to provide a method for inserting reinforcing bars into the corners of a lattice frame in a bed protection construction method using a lattice frame, thereby improving the fixation of the lattice frames to each other. [Means for solving the problem]
[0006] The present invention solves the above problem by inserting the insert rebar near the corner of the lattice frame, rotating it, and arranging the locking head of the insert rebar on a substantially diagonal line outside the lattice frame. That is, the present invention relates to a method for arranging an insert rebar in a corner of a lattice frame, comprising the steps of: preparing a lattice frame made of multiple wooden pieces assembled in stages in a lattice pattern; inserting an insert rebar consisting of a locking head and a hook foot between wooden pieces a and c of upper and lower stages that form one side near the corner of the lattice frame, inserting the locking head outward near the corner, and rotating the insert rebar to arrange the locking head on a substantially diagonal line outside the lattice frame. Effect of the Invention
[0007] By using the method of the present invention, a lattice frame with inserted reinforcing bars is able to be connected to each other at the four corners, which has the effect of making the lattice frames more firmly fixed to each other. [Brief description of the drawings]
[0008] [Figure 1] FIG. 2 is a perspective view showing an example of a lattice frame according to the present invention, viewed from the inside, with an insertion reinforcing bar inserted from the inside near one corner. [Diagram 2] FIG. 2 is a schematic plan view of a substantially vertically elongated U-shaped insertable rebar, which is an example of an insertable rebar used in the present invention. [Diagram 3] FIG. 11 is a schematic plan view showing another example of an inserted reinforcing bar used in the present invention. [Figure 4] FIG. 11 is a schematic plan view showing another example of an inserted reinforcing bar used in the present invention. [Diagram 5] 2 is a plan view of a state in which the engaging heads of the insertion reinforcing bars in FIG. 1 are arranged on a substantially diagonal line outside the lattice frame. [Figure 6] FIG. 6 is a plan view of four of the crisscross frames of FIG. 5 connected at their corners. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0009] The lattice frame used in the present invention is a lattice frame formed by assembling a plurality of wooden pieces in rows in a lattice pattern. Fig. 1 shows a frame made up of wooden pieces 1a, 1c, and 1e forming one side, and wooden pieces 1b, 1d, and 1f forming sides perpendicular to the one side. The number of rows of wooden piece 1 is not limited to that shown in Fig. 1, and any number of rows may be used. Wooden piece 1 is generally a square timber, but may also be a round timber, etc.
[0010] The inserting rebar 3 having the locking head 2 is inserted between the wooden pieces 1a and 1c of the lattice frame. The inserting rebar 3 is inserted at a position near the corner of the lattice frame. Then, the inserting rebar 3 is inserted until the locking head 2 protrudes outside the lattice frame. FIG. 1 is a perspective view showing the state in which the inserting rebar 3 is inserted from the inside of the lattice frame. Note that FIG. 1 does not show the cloth bag that is inserted along the inner surface of the lattice frame. If a cloth bag is used, a slit is made in the cloth bag with a carter or the like, and the inserting rebar 3 is inserted through the slit. In the inserted state, the inserting rebar 3 is generally approximately perpendicular to the wooden pieces 1a and 1c. After the inserting, the inserting rebar 3 is rotated. The rotation direction is such that the locking head 2 of the inserting rebar 3 is located on the corner side. In Fig. 1, the inserted rebar 3 is rotated counterclockwise (left) and the locking head 2 of the inserted rebar 3 is disposed on a substantially diagonal line outside the lattice frame. In this example, the inserted rebar 3 is inserted between wooden pieces 1a and 1c, but it may be inserted between wooden pieces 1c and 1e, between wooden pieces 1b and 1d, or between any other wooden pieces.
[0011] It is preferable to drive the bar 4 inside the wooden pieces 1a and 1c of the lattice frame. The bar 4 is generally U-shaped. It is preferable to drive the bar so that the straight part of the U-shaped bar is vertical. If the bar 4 is driven in a predetermined position, when the inserted reinforcing bar 3 is rotated, the locking head 2 of the inserted reinforcing bar 3 is easily stopped at a point located approximately on the diagonal line of the lattice frame. Then, by stopping it at this point and pouring ready-mixed concrete into the lattice frame and hardening it, a concrete block with a lattice frame in which the locking head 2 of the inserted reinforcing bar 3 is arranged at a predetermined position at the corner of the lattice frame is obtained. Since the bar 4 has such a function, if the point where the inserted reinforcing bar 3 is inserted is changed, for example, if the inserted reinforcing bar 3 is inserted between the wooden pieces 1c and 1e, the bar 4 is driven inside the wooden pieces 1c and 1e.
[0012] Any reinforcing bar 3 may be used as long as it has a locking head 2 and a hooking foot 5 to be embedded in concrete. In the present invention, it is preferable to use a substantially vertical U-shaped reinforcing bar as shown in FIG. 2. The substantially vertical U-shaped reinforcing bar is composed of a substantially U-shaped locking head 2 and a pair of substantially L-shaped hooking feet 5, 5 connected to the locking head 2. Alternatively, as shown in FIG. 3, a reinforcing bar composed of a hook-shaped locking head 2 and a substantially L-shaped hooking foot 5 connected to the locking head 2, or as shown in FIG. 4, a reinforcing bar composed of a circular locking head 2 and a substantially L-shaped hooking foot 5 connected to the locking head 2, may be used. The hooking foot 5 is for preventing the reinforcing bar 3 from coming out of the concrete, and is not limited to being substantially L-shaped, but may be of another shape such as a substantially T-shaped.
[0013] Depending on the shape of the inserted rebar 3, even if the inserted rebar 3 is rotated, the presence of the wooden piece 1b may restrict the rotation, making it difficult to arrange the locking head 2 on the diagonal outside the lattice frame. For example, when a substantially vertically elongated U-shaped inserted rebar is used, a pair of hook legs 5, 5 are caught on the wooden piece 1b, making it difficult to arrange the locking head 2 on the diagonal outside the lattice frame. In such a case, a gap may be provided between the wooden piece b and the wooden piece a and / or the wooden piece c. For example, a spacer may be sandwiched between the wooden piece a and the wooden piece b and / or the wooden piece b and the wooden piece c. The position where the spacer is sandwiched is preferably a position where it does not interfere with the rotation of the inserted rebar 3. Specifically, it is preferable to sandwich the spacer on the inner side of the wooden pieces 1a, 1b, and 1c (inside the lattice frame). Furthermore, even if a separating spacer is not provided, the distance between wooden pieces 1a and 1b is maintained at a constant width by the rafters 4, so a gap can be provided between wooden piece b and wooden piece a and / or wooden piece c by using wooden piece 1c whose vertical width is narrower than this constant width.
[0014] The inserted rebar 3 can rotate by utilizing this gap, and in any case, the final state is as shown in Fig. 5. Fig. 5 is a plan view showing the state in which the engaging head 2 of the inserted rebar 3 is arranged on a substantially diagonal line outside the lattice frame. When the inserted rebar 3 is a substantially vertically elongated U-shaped inserted rebar, it has a pair of hook legs 5, 5, and the lumber c is sandwiched between the pair of hook legs 5, 5. Therefore, even if an excessive external force is applied to the inserted rebar 3, the inserted rebar 3 is unlikely to shift, which is preferable.
[0015] The four lattice frames with the locking heads 2 of the inserted rebars 3 rotated to a predetermined position are connected in the state shown in FIG. 6. That is, the locking heads 2 located on the diagonal lines outside the four lattice frames are butted together at the outer corners of each of the four lattice frames, and the four lattice frames are connected by inserting a connector 6 such as a shackle into the locking heads 2 at the butted points. The same connection is performed at the other corners of each of the four lattice frames. However, depending on the construction situation, there may be cases where only two corners of the lattice frames are butted together, or only three corners of the lattice frames are butted together. In this case, the butted locking heads 2 can be connected with the connector 6. It is preferable to pour ready-mixed concrete into the lattice frames after connecting each lattice frame. Of course, ready-mixed concrete may be poured into each lattice frame and hardened to create a concrete block with a lattice frame, and then the block may be transported to the construction site, after which the locking heads 2 arranged on the outer corners of each lattice frame can be connected with the connector 6.
[0016] By using the above method, the concrete blocks with lattice frames can be connected at their four corners, which makes them more firmly fixed, making them useful for bed protection construction. [Explanation of symbols]
[0017] 1 wood 1a, 1c, 1e The timber of each step that constitutes one side 1b, 1d, 1f: each tier of timber constituting a side perpendicular to the one side 2 Locking head 3 Inserted rebar 4. Mussels 5 Hook foot 6 Connectors
Claims
1. A step of preparing a cross frame formed by assembling a plurality of wooden pieces in a cross pattern; a step of inserting an inserting reinforcing bar having a locking head and a hook foot between the upper and lower wooden pieces a and c constituting one side surface in the vicinity of a corner of the lattice frame, and inserting the locking head outward in the vicinity of the corner; The method for inserting reinforcing bars into corners of a lattice frame includes a step of rotating the inserting reinforcing bars to position the locking heads on an approximately diagonal line outside the lattice frame.
2. 2. A method for arranging an insert reinforcing bar at a corner of a lattice frame as described in claim 1, wherein an approximately vertical U-shaped insert reinforcing bar is used, the insert reinforcing bar consisting of an approximately U-shaped locking head and a pair of approximately L-shaped hook legs connected to the locking head, and when the approximately vertical U-shaped insert reinforcing bar is rotated, a part of a piece of wood b which is present between the piece of wood a and the piece of wood c and forms a side which is perpendicular to the one side is inserted between the pair of hook legs of the approximately vertical U-shaped insert reinforcing bar.
3. 3. A method for arranging an insert reinforcing bar at a corner of a lattice frame as described in claim 1 or 2, wherein a U-shaped clasp connecting wooden piece A and wooden piece C is driven into the inner surface of the lattice frame on the opposite side of the corner from the portion where the insert reinforcing bar is inserted.
4. 3. The method for inserting reinforcing bars into corners of a lattice frame according to claim 1 or 2, wherein a gap is formed between the wooden piece b and the wooden piece a and / or the wooden piece c.
5. 5. The method for inserting reinforcing bars into corners of a lattice frame according to claim 4, further comprising the step of inserting a spacer between the wooden pieces a and b and / or between the wooden pieces b and c.
6. A method for fixing a plurality of lattice frames having inserted reinforcing bars arranged therein by the method according to claim 1 or 2, by connecting the locking heads of the inserted reinforcing bars with connectors.