Semi-finished products for manufacturing lattice frames used in bed protection construction methods

Abstract

To provide a semi-product for manufacturing a parallel-cross frame allowing easy transportation and processing of the parallel-cross frame at a construction site.SOLUTION: A semi-product for manufacturing a parallel-cross frame is configured to stack square logs 1, 1, 1... of odd steps and square logs 2, 2, 2... of even steps in a direction orthogonal to an axis direction of the square logs to make steps vertically. In one end area of each of the square logs, a joint through hole 3 is formed. In the other end area of each of the square logs, a penetration shaft 4 is inserted to allow the square logs 1, 1, 1... of the odd steps and the square logs 2, 2, 2... of the even steps to be engaged. Each of the square logs is rotatable around the penetration shaft 4 as a fulcrum. The square logs 1, 1, 1... of the odd steps and the square logs 2, 2, 2... of the even steps rotate so as to keep an angle of about 90° therebetween to form the semi-product for manufacturing a parallel-cross frame into a generally L-shape. The parallel-cross frame is manufactured by inserting a joint tool into the joint through hole 3 by assembling one end areas of a pair of the semi-products in the generally L-shape so as to overlap the through holes 3 each other.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a semi-finished product for manufacturing lattice frames for use in bed protection construction methods, and in particular to a semi-finished product for manufacturing lattice frames for use in bed protection construction methods carried out for the purpose of preventing scouring of ground under flowing water such as on coasts, in rivers, or lakes. [Background technology]

[0002] Since the ground of coasts, rivers (riverbeds), lakes, and the shores of rivers and lakes are subject to scouring by running water, various bed protection methods have been implemented. For example, Patent Document 1 proposes placing a cloth bag along the inner surface of a lattice frame made of timbers arranged in lattice rows, pouring ready-mixed concrete into the cloth bag and allowing it to harden to form a framed concrete block, which is then installed on the ground beneath running water. As shown in Figure 11 of Patent Document 1, this lattice frame is made by assembling odd-numbered tiers of timbers and even-numbered tiers of timbers at right angles to each other, and inserting a through-hole through a shaft into the through-hole at both ends of each timber.

[0003] Such lattice frames are generally manufactured in a factory and transported to the construction site. However, when the lattice frame becomes large, for example when the length of the square timber exceeds 3m, it becomes bulky and difficult to transport. For this reason, it is possible to transport only the square timber to the construction site and manufacture the lattice frame there, but this reduces the work efficiency at the construction site and is not preferable.

[0004] [Patent Document 1] Patent No. 4844787 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a semi-finished product for manufacturing a lattice frame which is easy to transport and which also facilitates the manufacturing of the lattice frame at a construction site. [Means for solving the problem]

[0006] The present invention solves the above problem by inserting a through shaft into the end regions of a plurality of square timbers to engage the plurality of square timbers and to allow the plurality of square timbers to rotate freely. That is, the present invention is a semi-finished product for manufacturing a lattice frame for manufacturing a lattice frame for use in a bed protection method in which a lattice frame formed by assembling square timbers in a stepped lattice shape is installed on the ground and ready-mixed concrete is poured into the lattice frame and hardened to create a framed concrete block, in which the semi-finished product for manufacturing a lattice frame has a plurality of square timbers stacked in a direction perpendicular to the axial direction of the square timbers to form steps in the up-down direction, a connecting through hole is formed in one end region of the plurality of square timbers, a through shaft is inserted into the other end region of the plurality of square timbers to engage the plurality of square timbers, and the plurality of square timbers are rotatable about the through shaft. A first splint is provided in the vertical direction by fastening to the odd-numbered row of square timbers on the through shaft side in the vicinity of the connecting through hole, and a second splint is provided in the vertical direction by fastening to the even-numbered row of square timbers. The present invention relates to a semi-finished product for manufacturing a lattice frame, characterized in that

[0007] In addition, the term "cross-shaped structure" as used in the present invention does not only include a cross-shaped structure with timber protruding from the four corners, but also includes a structure that has a square shape in a plan view without timber protruding from the four corners. Effect of the Invention

[0008] In the semi-finished product for manufacturing a lattice frame according to the present invention, the plurality of square timbers can be rotated around the through shaft as a fulcrum. Therefore, when the semi-finished product is transported, the plurality of square timbers can be folded to be approximately flush, which makes it easy to transport. When manufacturing the lattice frame, each square timber is rotated around the through shaft as a fulcrum so that the odd-numbered square timbers and the even-numbered square timbers form an angle of approximately 90° or approximately 270°, to make the semi-finished product approximately L-shaped. Then, the pair of approximately L-shaped semi-finished products are assembled in a lattice shape so that the connecting through holes present in each end region of the pair of approximately L-shaped semi-finished products overlap, and the connecting shaft is inserted into the overlapping connecting through holes to obtain the lattice frame. Therefore, the lattice frame can be easily obtained, which improves the work efficiency at the construction site. [Brief description of the drawings]

[0009] [Figure 1]This is a front view of a semi-finished product for manufacturing a lattice frame according to an example of the present invention, in which the angle between the odd-numbered rows of square timbers and the even-numbered rows of square timbers is 0°, and each square timber is flush. [Diagram 2] FIG. 2 is a rear view of the semi-finished product for manufacturing the lattice frame of FIG. 1. [Diagram 3] FIG. 2 is a plan view of the semi-finished product for manufacturing the lattice frame of FIG. 1. [Figure 4] 2 is a plan view of a semi-finished product for manufacturing a lattice frame in FIG. 1, the semi-finished product being substantially L-shaped with the angle between the odd-numbered rows of square timbers and the even-numbered rows of square timbers being substantially 90°. [Diagram 5] FIG. 5 is a plan view of a lattice frame manufactured by combining the approximately L-shaped semi-finished products of FIG. 4. [Figure 6] FIG. 6 is a perspective view of the frame of FIG. 5. [Figure 7] 13 is a plan view of a frame manufactured using a semi-finished product for manufacturing a frame according to another embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The semi-finished product for manufacturing lattice frames has multiple square timbers 1, 2 stacked in a direction perpendicular to their axial direction to form vertical steps. The number of square timbers 1, 2 is arbitrary, and is generally about 3 to 6. A connecting through hole 3 is formed in one end region of the square timbers 1, 2. A through shaft 4 is inserted in the other end region of the square timbers 1, 2. A bolt may be screwed into the through shaft 4, or a column such as an iron pillar may be inserted. The square timbers 1, 2 are engaged at their other end regions by the through shaft 4. The square timbers 1, 2 are rotatable with the through shaft 4 as a fulcrum.

[0011] The square timbers 1,1,1... form the odd-numbered rows, and a first splint 5 is fixed to the square timbers 1,1,1... in the vertical direction. To fix the first splint 5 to the square timbers 1,1,1..., a pin 7 is driven into the first splint 5 and into the square timber 1. The square timbers 2,2,2... form the even-numbered rows, and a second splint 6 is fixed to the square timbers 2,2,2... in the vertical direction. To fix the second splint 6 to the square timbers 2,2,2..., a pin 8 is driven into the second splint 6 and into the square timber 2. With the first splint 5 and second splint 6 fixed, the square timbers 1,1,1... in the odd-numbered rows, and the square timbers 2,2,2... in the even-numbered rows can be rotated together. When each stage is rotated as a whole around the through shaft 4 as a fulcrum so that the angle between the odd-numbered stage square timbers 1,1,1... and the even-numbered stage square timbers 2,2,2... is approximately 90° or 270°, it becomes approximately L-shaped. FIG. 4 is a plan view of the state in which each stage is rotated as a whole to form an approximately L-shape so that the angle is approximately 90°. In this case, the first splint 5 and the second splint 6 are located on the outer surface of the well-shaped frame. On the other hand, although not shown, when each stage is rotated as a whole to form an approximately L-shape so that the angle is approximately 270°, the first splint 5 and the second splint 6 are located on the inner surface of the well-shaped frame.

[0012] The first splint 5 and the second splint 6 are fixed at the through-axis 4 side near the connecting through-hole 3. If the first splint 5 and the second splint 6 are fixed at such a position, it becomes easy to overlap the connecting through-holes 3 of the square timbers 1, 2 when manufacturing the lattice frame. That is, a pair of semi-finished products for manufacturing lattice frames is made substantially L-shaped as shown in FIG. 4, and one end region of the square timbers 2, 2, 2... of the even-numbered stages is inserted between one end region of the square timbers 1, 1, 1... of the odd-numbered stages. At this time, if the first splint 5 is inserted so that one end region of the square timbers 2, 2, 2... of the even-numbered stages abuts against the first splint 5 and one end region of the square timbers 1, 1, 1... of the odd-numbered stages abuts against the second splint 6, the connecting through-holes 3 are overlapped, and a connector (not shown) such as a bolt or a column can be smoothly inserted. Furthermore, if each stage of a pair of semi-finished products for manufacturing a lattice frame is rotated 270° to form an approximately L-shape, the first splint 5 and the second splint 6 will be located on the inner surface of the lattice frame, making it easier to abut the square timbers of each stage against the splints without the square timbers protruding from the four corners, making it easier to obtain a lattice frame that does not have square timbers protruding from the four corners.

[0013] If the dimensions of the square timbers are long, the central area of ​​the square timbers of the manufactured lattice frame is easily bent, and damage or destruction is likely to occur. In this case, after manufacturing the lattice frame, it is preferable to attach pieces (not shown) between the square timbers 1, 1 at approximately the center between the connecting through holes 3 and the through shafts 4 of the square timbers 1, 1, 1, . . . Also, it is preferable to attach pieces between the square timbers 2, 2 at approximately the center between the connecting through holes 3 and the through shafts 4 of the square timbers 2, 2, 2, . . . Furthermore, it is preferable to provide a reinforcing through hole 9 at approximately the center between the connecting through holes 3 and the through shafts 4 of the square timbers 1, 2, and to provide a through hole in the piece, and to insert a reinforcing shaft such as a bolt or a column through the reinforcing through hole 9 and the through hole in the piece to fix and attach the piece. In the above example, the number of pieces and the number of reinforcing through holes 6 to be attached are one, but it goes without saying that they are not limited to one, and may be two or three or more at approximately equal intervals.

[0014] As shown in FIG. 6, the two adjacent sides of the created lattice frame are staggered, with one side being a timber 1 of an odd-numbered step and the other adjacent side being a timber 2 of an even-numbered step. In order to further reinforce the lattice frame or to prevent the fresh concrete poured into the lattice frame from spilling out, it is preferable to correct this staggering in the top and / or bottom tier of the lattice frame to make the surfaces even. To explain this in detail based on FIG. 6, a timber similar to the timbers 2,2 is placed and fixed on the timbers 2,2 between the opposing timbers 1,1 in the top tier so that the top tier is even. Similarly, for the bottom tier, a timber similar to the timbers 2,2 may be fixed between the opposing timbers 1,1 in the bottom tier and below the timbers 2,2. Although FIG. 6 shows an example in which the top and bottom tiers are odd-numbered, the top tier may be an even-numbered tier and the bottom tier may be an odd-numbered tier.

[0015] After the lattice frame is manufactured, it is preferable to stretch a sheet-like material such as a mesh sheet on the inner surface of the lattice frame. This sheet-like material is intended to prevent the poured fresh concrete from leaking out through the gaps between the square bars 1,1 or square bars 2,2 in the vertical direction of the lattice frame. Therefore, the mesh size of the sheet-like material only needs to be smaller than the particle size of the aggregate used in the fresh concrete. Furthermore, when the ground on which the lattice frame is placed is uneven and there is a risk of the poured fresh concrete leaking, it is preferable to lay a sheet-like material on the ground and then place the lattice frame on the ground. Of course, a sheet-like material may be stretched on the bottom surface of the lowest level of the lattice frame.

[0016] As described above, the semi-finished products for manufacturing lattice frames are used to manufacture the lattice frames at the construction site. The lattice frames are then placed on the ground of a coast, river, etc., ready-mixed concrete is poured into the lattice frames and allowed to harden, and the framed concrete blocks are then placed on the ground to complete the bed protection work for the coast, river, etc. [Explanation of symbols]

[0017] 1. Timber (timber that makes up odd-numbered rows) 2. Timber (timber that makes up even-numbered rows) 3 Connection through hole 4 Through shaft 5 First splint (the splint attached to the square timber that makes up the odd-numbered row) 6 Second splint (splint attached to the square timber that makes up the even-numbered rows) 7 Pin (pin for fixing the first splint) 8 pins (pins for fixing the second splint) 9 Reinforcement through holes

Claims

1. A semi-finished product for manufacturing a lattice frame for use in a bed protection method in which a lattice frame made of square timbers arranged in rows and columns is placed on the ground, and ready-mixed concrete is poured into the lattice frame and hardened to create a framed concrete block, The semi-finished product for manufacturing a lattice frame has a plurality of square timbers stacked in a direction perpendicular to the axial direction of the square timbers to form vertical steps, a connecting through hole is formed in one end region of the plurality of square timbers, a through shaft is inserted in the other end region of the plurality of square timbers to engage the plurality of square timbers, and the plurality of square timbers can rotate about the through shaft as a fulcrum, A semi-finished product for manufacturing a lattice frame, characterized in that a first splice is provided in the vertical direction by being fixed to an odd-numbered row of square timber on the side of the through axis near the connecting through hole, and a second splice is provided in the vertical direction by being fixed to an even-numbered row of square timber.

2. 2. A semi-finished product for manufacturing a lattice frame according to claim 1, wherein a reinforcing through hole is formed in the approximate center of the square timber between the connecting through hole and the through shaft.

3. A step of preparing a pair of semi-finished products for manufacturing a lattice frame according to claim 1 or 2; a step of rotating the pair of semi-finished products for manufacturing a lattice frame about a through shaft so that an angle between the odd-numbered rows of square timbers and the even-numbered rows of square timbers becomes approximately 90° or approximately 270°, thereby forming the pair of semi-finished products for manufacturing a lattice frame into a substantially L-shape; a step of combining the pair of substantially L-shaped semi-finished products in a grid shape such that the connecting through holes present in the respective one end regions of the pair of substantially L-shaped semi-finished products overlap each other; A method for manufacturing a lattice frame, comprising the step of inserting a connecting shaft into the connecting through hole.

4. The method for manufacturing a lattice frame according to claim 3, further comprising the step of inserting a reinforcing shaft into the reinforcing through hole.

5. 5. A method for manufacturing a lattice frame according to claim 4, further comprising the step of inserting reinforcing shafts through the pieces provided between the odd-numbered rows of square timber and between the even-numbered rows of square timber.

Images