JP3406368B2 - A method of arranging bars in a concrete caisson. - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention relates to a breakwater, a quay, a seawall,
A concrete caisson used for mooring facilities, jetties, piers, etc. is manufactured by sequentially repeating the work of arranging reinforcing bars and placing concrete for each section of a predetermined height upwards. The present invention relates to a reinforcing bar arrangement method in a section.

[0002]

2. Description of the Related Art A caisson made of concrete is generally prepared by arranging reinforcing bars according to the shape of the caisson to be manufactured.
It is made by placing concrete between the molds placed on both sides of the reinforced reinforcing bar. Conventionally, when arranging reinforcing bars when manufacturing such a caisson made of concrete, the reinforcing bars are cut into a predetermined length according to the processing drawing, and if necessary, a bending machine is used to perform a predetermined dimension /
Reinforcing rods formed into a predetermined shape have been arranged by repeating a work of connecting each of these reinforcing rods one by one by a worker using a connecting means such as a binding wire according to a reinforcing bar diagram.

However, due to the deep water in port facilities, it has become necessary to increase the size of concrete caissons installed in ports and the like. As such a large caisson, for example, length × width × height of about 22 m × 30 m
There is a very large one with a length of 22 m, but the work of arranging the reinforcing bars to manufacture such a large caisson is as described above.
It is necessary to secure a large number of skilled workers in order to connect and arrange by using this binding wire, etc. Also, it takes a very long time for production, and work efficiency is very poor. There was a flaw. Due to the difficulty in securing workers and the current situation in the construction industry where the number of workers is decreasing due to the aging of skilled reinforcing bar workers, such a drawback is more remarkable in the reduction of work efficiency.

Generally, in order to manufacture a caisson made of concrete, first, a reinforced concrete forming a base is formed, and then a protruding vertical bar protruding at an upper end of the reinforced concrete forming the base is provided with an appropriate length (generally about 3 m). The length of each bar is connected as a vertical bar, and the horizontal bar is connected to this vertical bar at predetermined intervals to arrange the caisson according to the shape of the caisson to be manufactured. Formwork is arranged on both sides of the reinforcing bar, and concrete is placed between the formwork until the upper end of the longitudinal bar arranged is protruded by an appropriate length.
Then, after the concrete has solidified, to the projecting vertical bars projecting from the upper surface of the solidified concrete, rebars of appropriate length are connected as vertical bars in the same manner as described above, and horizontal bars are set to this vertical bar at predetermined intervals. The work of connecting the bars is repeated to arrange the reinforcing bars, and the concrete is placed between the formwork placed on both sides by sandwiching the arranged reinforcing bars until the height of the caisson to be manufactured is repeated. Manufactures concrete caisson.

However, when manufacturing the caisson made of concrete as described above, in the work of arranging the reinforcing bars, all the reinforcing bars to be reinforced are transported to the position where the worker should be reinforced one by one or collectively. After that, since it is necessary to connect the wires one by one by a connecting means such as a binding wire, there is a drawback that much labor and time are required. Further, there is a drawback that these works are very dangerous because they are carried out at a high place, for example, in the case of a very large caisson as described above, the work is carried out at a high place of 20 m or more.

The caisson made of concrete has a part that requires high strength and a part that does not require very high strength depending on its structure and use. For example, the outer wall generally requires high strength in many cases. Therefore, when manufacturing the caisson, the reinforcing bars laid in this part are laid in a dense state, and the bulkhead part generally does not require very high strength, so the reinforcing bars laid in this part are relatively coarse. Since it suffices that the reinforcements be arranged in a state, the portions that do not require very high strength in terms of manufacturing cost and work efficiency are arranged in a relatively rough state. Furthermore, the reinforcing bars to be reinforced are not uniformly arranged even in the part where the outer wall of the same plane is formed, and even more even in the part where the outer wall is formed and the part where the partition wall is formed. It is not arranged in a state, and if the connecting part is located on a straight line in the vertical direction and the horizontal direction respectively, the strength of this part will drop significantly, so the connecting part will be staggered in each direction. It is preferable to arrange the muscles in a complicated manner so that they are formed. For this reason, the worker selects the rebars to use while paying attention to the place where the rebars are to be laid, and measures the positions where the rebars should be placed while proceeding with the rebar work to connect the rebars. However, there is a drawback that it takes a lot of time and effort.

[0007]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned drawbacks of the prior art and makes it possible to safely and quickly carry out the work of arranging the reinforcing bars when manufacturing a caisson made of concrete. An object of the present invention is to provide a method for arranging one section of caisson manufacturing.

[0008]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have formed a lattice-shaped partition wall at least in the outer wall and in the space surrounded by the outer wall. The concrete caissons made up of are constructed as a work for arranging the reinforcing bars in one section when repeatedly manufacturing the work by arranging the reinforcing bars and placing concrete in each section with a predetermined height. L-shaped, T-shaped, and + -shaped members are formed by fixing horizontal bars protruding and fixed on predetermined surfaces of a base material made of steel at predetermined intervals and fixing vertical bars to the protruding horizontal bars in a grid pattern. A prefabricated three-dimensional reinforcing member is produced in advance, and the L-shaped three-dimensional reinforcing member is provided at the positions corresponding to the four corners of the concrete caisson to be produced, and the T-shaped one is provided at the position where the outer wall and the partition wall intersect. The three-dimensional reinforcing members of the The + type three-dimensional reinforcing members are arranged at intersecting positions on the reinforced concrete on which concrete has already been cast, and the lower ends of the base members are fixed to the protruding base members protruding at the upper end of the reinforced concrete. Similarly, after connecting the lower end of the vertical bar to the projecting vertical bar projecting to the upper end of the reinforced concrete, the planar reinforcing members in which the vertical bars and the horizontal bars are pre-connected in a grid pattern are fixed to each other. If it is arranged between the three-dimensional reinforcing members and the vertical reinforcing bar and the protruding vertical bar protruding at the upper end of the reinforced concrete are connected to the horizontal reinforcing bar and the horizontal reinforcing bar of each three-dimensional reinforcing member, it is not a skilled worker. Rebar can be easily arranged as shown in the bar arrangement diagram, and even if the prefabricated three-dimensional reinforcement members or planar reinforcement members are manufactured in the factory or near the site, they are arranged in one section. To Than it is the present invention has been completed to investigate that can be produced caissons can be carried out during the period in a short period of time.

A method of arranging a section of concrete caisson according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a perspective view showing an example of a concrete caisson to be manufactured, and FIG. 2 shows an example of an L-shaped three-dimensional reinforcing member used in the method of the present invention.
Is a perspective view showing an example in which the base material and the horizontal bar are welded, (b)
Is a perspective view showing an example in which a horizontal streak penetrates and is fixed to the base material, (c) is a perspective view showing an example in which a crack prevention streak is fixed to the base material, and (d) is a crack prevention A perspective view showing an example in which the angle steel to which the studs are fixed is fixed,
(E) is an explanatory plan view showing an example in which haunch muscles are connected. 3A and 3B respectively show examples of a T-shaped three-dimensional reinforcing member used in the method of the present invention. FIG. 3A is a perspective view showing an example in which a base material and horizontal bars are welded, and FIG. 3B is a base material. A perspective view showing an example in which a horizontal streak fixed to a flange portion of is fixed through.
(C) is a perspective view showing an example in which a crack preventing stud is fixed to a web portion of a base material, and (D) is a plan explanatory view showing an example in which a haunch streak is connected. FIG. 4 shows examples of + type three-dimensional reinforcing members used in the method of the present invention, (a) is a perspective view showing an example in which a base material and transverse bars are welded, and (b) is a base material. FIG. 7 is a perspective view showing an example in which the horizontal muscles are fixed by penetrating, and FIG. FIG. 5 shows examples of prefabricated planar reinforcing members used in the method of the present invention. In (a), the ends of the horizontal stripes are in a vertical direction and the ends of the vertical stripes are in a horizontal direction. A front view showing an example in which the horizontal and vertical stripes are connected to each other, (b) shows that the ends of the horizontal stripes are displaced left and right and the ends of the vertical stripes are vertically displaced. FIG. 7 is a front view showing an example in which horizontal stripes and vertical stripes are connected. FIG. 6 is a partial explanatory view showing a state in which the method of the present invention is being carried out, and FIG. 7 is a projecting base material when arranging the three-dimensional reinforcing members used in the method of the present invention on already reinforced concrete. It is explanatory drawing explaining the connection with the base material of each three-dimensional reinforcement member.

In the drawing, reference numeral 1 denotes a concrete caisson in which a lattice-shaped partition wall 1b is formed over the entire height in a space surrounded by four outer walls 1a, as shown in FIG. As described above, there are those in which the lower end is closed by forming a base, and in some cases, the lower end is open.
The method of the present invention uses the concrete caisson 1 as described above.
Is reinforced according to the shape of the concrete caisson 1 to be manufactured for each section of a predetermined height, and the form is arranged on both sides by sandwiching the reinforced bars. After the concrete is placed between the molds and solidified until the upper end of the vertical stirrup protrudes by an appropriate length, the projecting vertical streak protruding from the upper surface of the solidified concrete is described above. Similarly to the caisson 1 to be manufactured, the work of arranging the reinforcing bars and arranging the formwork and placing concrete between the formworks is performed up to the height of the caisson 1 to be manufactured. This is a method of arranging the reinforcing bars embedded in concrete in each section when manufacturing is performed by sequentially repeating the above.

In order to carry out the method of the present invention, the horizontal streaks 2c, at predetermined intervals in the vertical direction, are formed on predetermined portions of flanges or webs of the base material 2a, 3a, 4a made of lightweight shaped steel material or shaped steel material.
The protrusions 3c and 4c are fixed and formed into L-shape, T-shape and + -shape when viewed in a plan view, and the protruding transverse lines 2c and 3 are formed.
The vertical stripes 2b, 3b, and 4b are fixed to the c and 4c in a grid pattern, and L
3D, T-shaped and + -shaped three-dimensional reinforcing members 2, 3,
Produce 4 in advance.

This L-shaped three-dimensional reinforcing member 2 uses angle steel as the base material 2a as shown in FIG. 2 (hereinafter, the base material of the L-type three-dimensional reinforcing member may be referred to as angle steel). The horizontal bars 2c are arranged horizontally on the outer surface of the chevron 2a at predetermined intervals in the vertical direction, and the horizontal bars 2c are projected and fixed, and the vertical bars 2b are connected to the projecting horizontal bars 2c in a grid pattern. In addition, so-called double bar arrangement in which rebars that are connected in a lattice form as described above are connected in a parallel state by maintaining a predetermined interval via, for example, a width stop bar that is formed in a substantially U shape. The aspect comprised by making it can be mentioned. Angle steel
In order to fix the horizontal bars 2c to the outer surfaces orthogonal to 2a, the ends of the horizontal bars 2c can be welded and fixed to the respective outer surfaces of the angle steel 2a as shown in Fig. 2 (a). As shown in the drawing, a through hole is formed at a predetermined position on the same horizontal surface on both outer surfaces of the angle steel 2a orthogonal to each other, and the bent end portion of the horizontal bar 2c whose end portion is bent through this through hole penetrates the outer surface. It may be inserted in the hole and fixed at the position of the through hole.

In addition, a transverse streak 2c is formed on each outer surface of the angle steel 2a which is orthogonal to each other.
In the former aspect of welding the ends of the above, since the respective inner surfaces orthogonal to each other are flat surfaces, cracks are likely to occur when the concrete cast in the vicinity of these surfaces is subjected to dry shrinkage or external load. If such cracks are likely to occur, fix the crack prevention bar 2e around the angle steel 2a as shown in Fig. 2 (c), or use the cracks on the orthogonal outer surface as shown in Fig. 2 (d). Angle steel 2f with fixed stud 2fa
It is desirable that the horizontal stripes 2c are connected to the angle steel 2a, which is fixed by projecting, with their edges abutted against each other by a joining means such as welding.

Further, at the positions on both sides in the vicinity of the angle steel 2a, there are transverse bars 2c.
It is preferable to connect the haunch muscle 2d to
2d may be connected after the L-shaped three-dimensionally arranging member 2 is arranged at a predetermined position, but may be connected in advance as shown in FIG.

As shown in FIG. 3, the T-shaped three-dimensional reinforcing member 3 uses H-shaped steel as the base material 3a (hereinafter, the base material of the T-shaped three-dimensional reinforcing member may be referred to as H-shaped steel). Then, this H-shaped steel 3a
The horizontal streaks 3c are arranged horizontally on the flange part of the machine at predetermined intervals in a vertical direction to project and fix the horizontal streaks 3c, and the vertical streaks 3b are connected to the projecting horizontal streaks 3c in a lattice form. As described above, the reinforcing bars that are connected in a lattice shape are connected in parallel with each other while maintaining a predetermined interval through a width-setting bar that is formed in a substantially U shape, and are orthogonal to the horizontal bars 3c fixed to the flange portion. The horizontal stripes on one side of the web at a predetermined interval in the vertical direction.
An example is one in which 3c is projected and fixed, and the horizontal streaks 3c are connected to the vertical streaks 3b in a grid-like state. In this structure, the horizontal bar 3c fixed to the flange portion of the H-section steel 3a is arranged at a position corresponding to the outer wall of the caisson to be manufactured which requires a relatively high strength, so that the bar is double-barred. The horizontal bar 3c fixed to the portion is arranged in a single bar because it is arranged at a position corresponding to the partition wall which is not required to have relatively high strength, but double bar or single bar is arranged as necessary. To fix the horizontal bar 3c to each part of the H-shaped steel 3a, as shown in FIG. 3 (a), the end of the horizontal bar 3c is welded and fixed to each part of the H-shaped steel 3a to be fixed, or to the flange part. As shown in Fig. 3 (b), the horizontal streaks 3c to be fixed are sandwiched between the webs and through holes are formed at positions corresponding to the flanges on both sides. It may be fixed at the positions of the two through holes.

Further, since the H-section steel 3a has a flat surface on the side opposite to the surface on which the transverse streaks 3c of the web portion are fixedly projected,
When the concrete placed near this surface is subjected to drying shrinkage or an external load, cracks easily occur. Therefore, if the occurrence of such cracks is suspected, as shown in FIG. 3C, the stud 3e for preventing cracks is formed on the web portion of the flat surface.
Is preferably fixed by protruding.

Further, an H-shaped steel having a horizontal bar 3c protrudingly fixed to the web portion of the H-shaped steel 3a and a horizontal bar 3c protrudingly fixed to the flange portion.
It is preferable to connect the haunch muscle 3d to the vicinity of the 3a position, but the haunch muscle 3d may be connected after the T-shaped three-dimensionally arranging member 3 is arranged at a predetermined position. It may be connected in advance as shown in (d).

The + type three-dimensional reinforcing member 4 uses grooved steel as the base material 4a as shown in FIG. 4 (hereinafter, the base material of the + type three-dimensional reinforcing member may be referred to as grooved steel). Then, this channel steel 4a
The horizontal streaks 4c are horizontally arranged at predetermined intervals in the vertical direction at predetermined intervals in the vertical direction to project and fix the horizontal streaks 4c, and the vertical streaks 4b are connected to the projecting horizontal streaks 4c in a grid-like state. In the direction orthogonal to the fixed horizontal stripes 4c, the horizontal stripes 4c are horizontally arranged on both surfaces of the web portion at predetermined intervals in the vertical direction to project and fix the horizontal stripes 4c, and the vertical stripes 4b are grid-shaped on the horizontal stripes 4c. It is configured by connecting in a state of forming. Further, if necessary, the reinforcing bars 4b and 4c that are connected in a lattice form are connected in parallel in each direction at predetermined intervals via a width stop bar that has a substantially U-shape, for example. A mode in which so-called double reinforcement is configured can be mentioned. Horizontal bars 4c on each part of channel steel 4a
In order to fix, the end of the horizontal bar 4c is welded and fixed to each part of the channel steel 4a to be fixed as shown in Fig. 4 (a), or fixed to the web part as shown in Fig. 4 (b). For the horizontal stripes 4c to be formed, a through hole is formed in the web portion and the horizontal stripes 4c are formed in the through holes.
The horizontal bar that is fixed by passing through
As for 4c, the web is sandwiched, and through holes are formed at the positions facing the flanges on both sides, and the horizontal streak 4c is penetrated through both of these through holes and fixed at these two through hole positions. Good.

Further, a grooved steel having a horizontal bar 4c protrudingly fixed to the web portion of the channel steel 4a and a horizontal bar 4c protrudingly fixed to the flange portion.
It is preferable to connect the haunch muscle 4d to the vicinity of the 4a position, but the haunch muscle 4d may be connected after the + type three-dimensional arrangement member 4 is arranged at a predetermined position. It may be connected in advance as shown in (c).

As described above, the L-shaped, T-shaped, and + -shaped three-dimensional reinforcing members 2, 3, and 4 have the configurations in which the L-shaped three-dimensional reinforcing member 2 is made of chevron steel as the base materials 2a, 3a, and 4a. The T-shaped three-dimensional reinforcing member 3 uses H-shaped steel, and the + -shaped three-dimensional reinforcing member 4 uses grooved steel. However, the horizontal reinforcing bar is in a predetermined state, that is, L-shaped when viewed in a plan view. Shaped steels of various shapes can be used as long as the horizontal bars 2c, 3c, 4c can be fixed in a protruding manner in a state of having a T-shape, a T-shape and a + shape.

The L-shaped, T-shaped, and + -shaped three-dimensional arrangement members 2, 3 and 4 are located at the positions corresponding to the corners of the four corners and at the positions where the outer wall 1a and the partition wall 1b intersect. The three-dimensional structure is arranged at the corresponding positions or at the positions corresponding to the positions where the partition walls 1b and 1b intersect with each other, and is arranged at the portion of the concrete caisson 1 to be manufactured that requires high strength. Regarding the reinforcing members 2, 3 and 4, the horizontal reinforcing bars 2c, 3c and 4c adjacent to each other in the vertical direction are narrowed to connect the reinforcing bars densely.

In addition to the above-mentioned three-dimensional bar arrangement members 2, 3 and 4, a plane bar arrangement member 5 in which linear horizontal bars 5b and vertical bars 5a are connected in a grid pattern is manufactured in advance. The plane reinforcing member 5 is arranged at a position corresponding to a portion of the caisson 1 made of concrete to be manufactured, which is required to have a relatively high strength, or a position corresponding to a portion to which a relatively high strength is not required, as will be described later. It is for adjusting the distance between the horizontal horizontal bars 5b adjacent to each other in the vertical direction and the interval between the vertical vertical bars 5a adjacent to each other in the vertical direction corresponding to the strength of the position to be arranged. It is connected in a rough state.

As described above, the three-dimensional reinforcing members 2, 3 and 4 and the planar reinforcing member 5 which are manufactured in advance as described above have horizontal lateral stripes 2c, 3c, 4c and 5b adjacent to each other in the vertical direction, and their tips have a straight line shape. Vertical streaks 2b, 3 that are adjacent to each other
Although b, 4b and 5a may be connected to each other in a state where their tips are in a straight line shape, respectively,
c, 4c and 5b are displaced in the left-right direction so that their tips do not form a straight line, and the vertical stripes 2b, 3b, 4b and 5a
However, it is preferable that the tips are connected in a zigzag manner in a vertically displaced state so that the tips do not form a straight line, because the decrease in strength at the connecting portion is reduced.

The horizontal bars 2c, 3c, 4c and 5b and the vertical bars when manufacturing the three-dimensional bar members 2, 3, 4 and the plane bar member 5
Each connection with 2b, 3b, 4b and 5a may be performed by tightly connecting the intersections of the reinforcing bars with a binding wire or by spot welding with an industrial machine.

Then, the three-dimensional reinforcing members 2, 3 and 4 are arranged at the corresponding positions on the reinforced concrete 6 on which the concrete has already been poured, and the projecting base material projecting on the upper end of the reinforced concrete 6 that has been cast. After fixing the lower ends of the base materials 2a, 3a, 4a to 2a ', 3a', 4a ', projecting longitudinal bars 2b', 3 projecting at the upper end of the reinforced concrete 6 that has been cast
The lower ends of the vertical stripes 2b, 3b, 4b are connected to b ', 4b'. That is, the L-shaped three-dimensional reinforcing members 2 are provided at positions corresponding to the four corners of the concrete caisson 1 to be manufactured,
At the position where 1a and the partition wall 1b intersect, a T-shaped three-dimensional reinforcing member 3
At the position where the bulkheads 1b and 1b intersect with each other, the + type three-dimensional reinforcing members 4 are arranged in a hanging state by a crane, and the protruding base materials 2a ', 3a' and 4a 'are provided with the base materials. 2a, 3a, 4a
The lower end of each of the vertical streaks 2b 'and 3 is fixed by the operator.
The b'and 4b 'are connected to the vertical streaks 2b, 3b and 4b of the three-dimensional arrangement members 2, 3 and 4. At this time, the T-shaped three-dimensional reinforcing member 3 is arranged in which the horizontal reinforcing bars 3c connected to the positions corresponding to the partition walls are not double reinforcing bars but are arranged only in the same vertical plane. In this case, as a + type three-dimensional arrangement member 4 adjacent to this T-type three-dimensional arrangement member 3, a horizontal line is formed.
4c is a single bar arrangement.

The projecting base materials 2a ', 3a', 4a 'and the three-dimensional reinforcing members 2, 3 when the three-dimensional reinforcing members 2, 3, 4 are arranged.
As shown in FIG. 7, the positioning plates 3 and 4 are fixed to the base materials 2a, 3a and 4a by welding the positioning plates to the inner and / or outer surfaces of the lower parts of the base materials 2a, 3a and 4a so as to project downward from the lower end. And fixed by bolts, and the lower end surfaces of the base materials 2a, 3a, 4a of the three-dimensional reinforcing members 2, 3, 4 are placed on the upper end surfaces of the protruding base materials 2a ', 3a', 4a 'to project. Positioning plates are superposed on the base materials 2a ', 3a', 4a 'and the protruding base materials 2a', 3a ', 4a' and the positioning plates are fixed by welding or bolts, or the lower ends of the base materials 2a, 3a, 4a Fix the fixing plate in the state of protruding outward to the
Fix the fixing plates to the lower ends of 2a ', 3a', and 4a 'so that they project outward, and then fix the fixing plates by overlapping and fixing them with bolts, or by combining these methods to project. The upper end surfaces of the base materials 2a ', 3a' and 4a 'and the steric reinforcement member 2,
This can be performed by welding the lower end surfaces of the base materials 2a, 3a, 4a of 3, 4 to each other.

In addition, the projecting vertical bars 2b ', 3b' and 4b 'projecting at the upper end of the reinforced concrete 6 on which concrete has already been cast and the vertical bars 2b, 3b and 4b of the respective bar arrangement members 2, 3 and 4 The connection is a spring action that is formed by adjoining two reinforcing bar attachment parts that overlap each other at both ends and have a binding wire and one side surface that is open and has a radius of curvature slightly smaller than the outer diameter of the reinforcing bar to be connected. It can be performed by a method of connecting with a lap joint made up of the clips that it has, but if necessary, both ends of the reinforcing bars may be overlapped and spot welded.

Next, between the adjacent three-dimensional reinforcing members 2 and 3, 3, 3, 3, 4 and 4 and 4 fixed on the cast reinforced concrete 6, the strength corresponding to the position is applied. The horizontal reinforcing bar 5b and the vertical reinforcing bar 5a are connected in a lattice shape at the reinforcing bar density, and the plane reinforcing bar member 5 is hung down by a crane as shown in Fig. 6, and the vertical reinforcing bar 5a and concrete are already placed. Vertical bars protruding from the upper end of reinforced concrete 6
5a ', and the horizontal bar 5b and the horizontal bars 2c, 3c, 4c of the three-dimensional reinforcing members 2, 3, 4 are overlapped and connected.

The connection between the projecting vertical bar 5a 'projecting at the upper end of the reinforced concrete 6 on which the concrete has already been cast and the horizontal bar 5b of the plane bar arrangement member 5, and the three-dimensional bar arrangement members 2, 3,
The horizontal bars 2c, 3c, 4c of 4 and the horizontal bars 5b of the planar bar arrangement member 5 are connected by the vertical bars 2b, 3b of the three-dimensional bar members 2, 3 and 4 described above.
And 4b and the protruding vertical stripes 2b ', 3b' and 4b 'may be connected by the same method.

The connecting positions of the vertical streaks 2b, 3b, 4b and 5a of the above-mentioned respective bar arrangement members 2, 3, 4 and 5 and the protruding vertical bar 5a 'and the adjacent three-dimensional bar arrangement members 2, 3, 4 Horizontal muscles 2c, 3c, 4c
As described above, the connecting position between the horizontal reinforcing bar 5a and the horizontal reinforcing bar 5a is such that the normal reinforcing bars are connected to each other at their overlapping portions.
Horizontal horizontal stripes 2c, 3c, 4c and 5b adjacent to each other in the vertical direction are in a state in which their tips are in a straight line, and vertical vertical stripes 2b, 3b, 4b and 5a adjacent in the left and right are in a straight line to their tip. Rather than being connected to each other in a state of
Since the tip is connected in a zigzag pattern so that it does not form a straight line in the vertical direction or the horizontal direction, the decrease in strength at the connecting part is reduced, so the amount of rebar used In order to save money, the longitudinal bars 2b, 3b, 4b and 5a and the lateral bars 2c, 3c, 4c and 5b of each bar arrangement member 2, 3, 4 and 5 are configured such that their tips are not in a straight line. It is preferable to use the ones mentioned above.

[0031]

When the method for arranging a section of concrete caisson according to the present invention is carried out, the reinforcing bar having a length corresponding to the constituent points in consideration of the strength of the caisson to be manufactured. When arranging in accordance with the arranging diagram showing the arranging state for arranging a desired state, each of the L-shaped, T-shaped and + -shaped three-dimensional arranging members 2, 3, 4 and the plane arranging member Since 5 is manufactured in advance, the respective bar arrangement members 2, 3, 4 and 5 can be manufactured efficiently.
Therefore, it is necessary to manufacture each rebar member accurately and in a short time according to the rebar drawing showing a state in which various reinforcing bars are arranged in a complicated manner by repeatedly manufacturing each rebar member 2, 3, 4 and 5. You can

In addition, regardless of whether each of the reinforcing members is manufactured in a factory or in the vicinity of the site, each reinforcing bar is arranged in one section on the reinforced concrete on which concrete has already been cast. Since the members 2, 3, 4 and 5 are manufactured in advance, it is possible to arrange the bar in a short time by a small number of workers. That is, for example, length x width x height is about 22 m
A caisson 1 made of concrete such as a very large caisson such as x30m x 22m is usually manufactured by sequentially repeating the work of arranging reinforcing bars and placing concrete from each section of an appropriate height from the bottom. Therefore, in the case of manufacturing the reinforcing bars 2, 3, 4 and 5 near the site, the reinforcing bars 2, 3, 4 and 5 are manufactured by placing concrete between the molds and solidifying the concrete. Since it can be performed before the process, each bar arrangement member can be efficiently manufactured, and the period required for manufacturing the caisson 1 can be significantly shortened.

Each of the three-dimensional reinforcing members 2, 3 and 4 is easily manufactured because the horizontal bars are welded or penetrated to 2a, 3a and 4a and fixed to the base material made of lightweight shaped steel material or shaped steel material. Also, the connection between the vertical bar 5a and the horizontal bar 5b of the flat bar arrangement member 5 can be welded by an automatic welding machine and can be manufactured efficiently,
It is possible to reduce the time and the number of workers involved in producing the three-dimensional reinforcing members 2, 3, 4 and the planar reinforcing member 5.

Further, in the work of arranging the reinforcing bars in the predetermined sections, the horizontal reinforcing bars 2b, 3b, 4b are fixed to the base materials 2a, 3a, 4a which are rigid bodies, and the three-dimensional reinforcing bar members 2 having self-supporting property are provided. The base materials 2a, 3a and 4a of 3 and 4 are fixed to the protruding base materials 2a ', 3a' and 4a 'which are projected on the reinforced concrete on which concrete has already been cast, and the vertical bars 2b', 3b ', 4b 'projecting longitudinal streaks 2b', 3
Since they are connected to b'and 4b ', they can be easily arranged at predetermined accurate positions.

Then, since the plane reinforcing member 5 is arranged between the arranged three-dimensional reinforcing members 2, 3 and 4, the horizontal reinforcing bar 5b of the non-independent planar reinforcing member 5 is replaced by the three-dimensional reinforcing member 2. , 3 and 4 horizontal bars 2c, 3c and 4c can be easily overlapped and positioned, and the horizontal bars 2c, 3c and 4c of each bar arrangement member 2, 3, 4 and 5 can be easily positioned.
In the case where 5 and 5b are manufactured by forming the tips thereof in a zigzag pattern in the vertical direction, the protruding tips of the transverse bars of one bar arrangement member and the transverse bars of the other bar arrangement member that are arranged adjacent to each other. The retracted tip can be easily positioned by superimposing it and can be easily connected in a short time.

Further, each of the L-shaped and T-shaped three-dimensional arrangement members 2, 3
When the base material 2a, 3a in Fig. 2 is exposed on the flat surface without protruding the reinforcing bar, the strength of the boundary portion between the flat surface and concrete is weak. When the angle steel 2f to which the prevention stud 2fa is fixed is fixed, or when the crack prevention stud 3e is fixed to the base material 3a, the drying shrinkage of concrete that occurs when the base material 2a, 3a is placed Alternatively, it is preferable because it can prevent cracking due to external force.

In such a high place to be reinforced, the measurement of the position of the reinforcing bar and the transportation by the operator can be greatly reduced, and the position of the caisson 1 made of concrete is required to be very high. Although the reinforcing bar density of the reinforcing bar member to be connected, particularly the planar reinforcing bar member 5, is different from the position where strength is not required, the planar reinforcing bar member has a reinforcing bar density corresponding to the strength of the connecting position. Since 5 is manufactured in advance, the operator reads and determines the type of the reinforcing bar member at the position to be connected from the drawing and arranges and connects the planar reinforcing bar member 5 having the reinforcing bar density corresponding to the position. It is not necessary to read out each rebar one by one from a complicated bar arrangement diagram, and therefore, the rebar work can be performed only by connecting relatively simple rebars.
Moreover, the method of arranging one section in the concrete caisson production according to the present invention, which can be performed in a short time and therefore the risk is greatly reduced, is very important in contributing to marine civil engineering.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a concrete caisson to be manufactured.

2A and 2B respectively show examples of an L-shaped three-dimensional reinforcing member used in the method of the present invention, FIG. 2A is a perspective view showing an example in which a base material and horizontal bars are welded, and FIG. A perspective view showing an example in which a horizontal streak penetrates and is fixed to a material, (c) is a perspective view showing an example in which a crack prevention streak is fixed to a base material, (d) is a chevron steel for preventing cracks on a base material Is a perspective view showing an example in which
(E) is an explanatory plan view showing an example in which haunch muscles are connected.

3A and 3B respectively show examples of a T-shaped three-dimensional reinforcing member used in the method of the present invention, in which FIG. 3A is a perspective view showing an example in which a base material and transverse bars are welded, and FIG. A perspective view showing an example in which the horizontal stripes fixed to the flange portion of the material are fixed through, (C)
FIG. 3 is a perspective view showing an example in which a crack preventing stud is fixed to a web portion of a base material, and (d) is a plan view showing an example in which a haunch streak is connected.

FIG. 4 shows examples of + type three-dimensional reinforcing members used in the method of the present invention, (a) is a perspective view showing an example in which a base material and horizontal bars are welded, and (b) is a base FIG. 6 is a perspective view showing an example in which a horizontal streak is fixed through a material, and (c) is a plan explanatory view showing an example in which a haunch streak is connected.

5A and 5B respectively show examples of prefabricated planar reinforcing members used in the method of the present invention, in which FIG. 5A shows the ends of the horizontal stripes in the vertical direction and the ends of the vertical stripes in the horizontal direction. A front view showing an example in which a horizontal line and a vertical line are connected to each other,
(B) is a front view showing an example in which the lateral streaks and the vertical streaks are connected with the ends of the horizontal streaks being displaced left and right and the ends of the vertical streaks being vertically displaced. .

FIG. 6 is a partial explanatory view showing a state in which the method of the present invention is being carried out.

FIG. 7 is an explanatory view for explaining the connection between the protruding base material and the base material of each of the three-dimensional reinforcing members when the three-dimensional reinforcing members used in the method of the present invention are arranged on already reinforced concrete. is there.

[Explanation of symbols]

1 Concrete caisson 1a exterior wall 1b bulkhead 2 L-shaped three-dimensional reinforcing member 2a Base material (angle steel) 2a 'protruding substrate 2b vertical streak 2b 'protruding vertical streak 2c horizontal stripes 2d haunch muscle 2e Crack prevention muscle 2f angle steel 2fa crack prevention stud 3 T-shaped three-dimensional reinforcing member 3a Base material (H-shaped steel) 3a 'protruding substrate 3b vertical streaks 3b 'protruding vertical streak 3c lateral streaks 3d haunch muscle 3e Crack prevention stud 4 + type three-dimensional arrangement member 4a Base material (channel steel) 4a 'protruding substrate 4b vertical streaks 4b 'protruding vertical streak 4c horizontal stripes 4d haunch muscle 5 Plane reinforcement members 5a vertical streaks 5a 'Longitudinal streak 5b transverse 6 Reinforced concrete

Front page continuation (72) Inventor Naoyuki Iki 2-23-18 Shimomeguro, Meguro-ku, Tokyo Within Wakatsuki Construction Co., Ltd. (56) Reference JP-A-3-233074 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) E02D 23/00 E04C 5/01

Claims (8)

(57) [Claims] 1. A caisson (1) made of concrete having at least an outer wall (1a) and a partition wall (1b) which is lattice-shaped when viewed in a plan view is formed in a space surrounded by the outer wall (1a) and has a predetermined height. Reinforcing bar is placed in each section and the concrete is placed by repeating the work in order upward, and it is a bar arrangement method in one section when manufacturing, and a base material (2a, 3a, 4a) made of shaped steel Horizontal stripes (2c, 3c, 4c) on each of the specified surfaces in the vertical direction at specified intervals
L and T are fixed by projecting and fixing the vertical streaks (2b, 3b, 4b) to the projecting lateral streaks (2c, 3c, 4c) in a grid pattern.
The three-dimensional reinforcing members ( 2, 3, 4 ) formed in the mold and the + shape are manufactured in advance, and the L-shaped three-dimensional reinforcing members (at the positions corresponding to the corners of the four corners of the concrete caisson to be manufactured) are manufactured. 2 )
At the position where the outer wall (1a) and the partition wall (1b) intersect, the T-shaped steric reinforcement member ( 3 ), and at the position where the partition walls (1b) intersect each other, the + type steric reinforcement member ( 4). ) Are respectively placed on the reinforced concrete on which the concrete has already been cast, and projecting base materials (2a ′, 3a ′, 4) projecting at the upper end of the reinforced concrete.
The lower end of the base material (2a, 3a, 4a) is fixed to the a '), and the vertical bar (2b, 3b', 4b ') is also projected to the upper end of the reinforced concrete. 3b and 4b) are connected to each other, and then vertical reinforcing bars (5a) and horizontal reinforcing bars (5b) are preliminarily connected to each other in a grid pattern. (2,3), (3,3), (3,4) and
The vertical bar (5a) disposed between (4, 4) and the projecting vertical bar (5a ') projecting to the upper end of the reinforced concrete are also provided with the horizontal bar (5b) and the steric reinforcement member (2, 3, 3). 4) transverse muscle (2c, 3c, 4
c) A method for arranging a section of concrete in caisson production, characterized by connecting with. 2. A base material (2) is used as the L-shaped three-dimensional reinforcing member (2).
a) is a chevron, and the transverse streaks (2
The method of arranging a section of caisson made of concrete according to claim 1, wherein c) is used by protrudingly fixing. 3. A base material (3) is used as a T-shaped three-dimensional reinforcing member (3).
3. A caisson made of concrete according to claim 1 or 2, wherein a) is an H-shaped steel, and the H-shaped steel has lateral flanges (3c) protrudingly fixed to the outer surface of the flange and the web. Arrangement method of compartments. 4. A base material (4) is used as a + type three-dimensional reinforcing member (4).
4. The concrete according to any one of claims 1 to 3, wherein a) is a channel steel, and the channel steel has a lateral portion (4c) protrudingly fixed to the outer surface of the flange portion and the web portion. Method for arranging one compartment in manufacturing caisson made of steel. 5. L-type, T-type and + -type three-dimensional reinforcing members
As (2,3,4), adjacent vertical stripes (2b, 3b, 4b) are arranged with their tips vertically offset, and adjacent horizontal stripes.
5. A three-dimensional reinforcing member is used in which (2c, 3c, 4c) are arranged and connected with their tips displaced in the left-right direction.
A method for arranging a section of concrete caisson according to any one of 1 to 6 above. 6. Adjacent vertical streaks (5) as planar reinforcing members (5).
a, 5a) are arranged in a vertically displaced state, and adjacent horizontal bars (5b, 5b) are arranged in a laterally displaced state and are connected to each other using a planar reinforcing member. A method of arranging one section in the caisson production made of concrete according to any one of 1 to 5. 7. An anti-cracking bar (2) is provided on a flat surface of the base material (2a) of the L-shaped three-dimensional reinforcing member (2) which does not project the reinforcing bar.
e) or a chevron steel (2f) to which a stud (2fa) for preventing cracks is fixed, and a method for arranging one section in the caisson production of concrete according to any one of claims 1 to 6. . 8. The crack preventing stud (3e) is fixed to a web portion of the base material (3a) of the T-shaped three-dimensional reinforcing member (3) which does not project the reinforcing bar. A method for arranging one section in the production of the caisson made of concrete according to any one of claims.