JP2021021274A - Core material building-in method and core material building-in device - Google Patents

Abstract

To provide a core material building-in method with which core material building-in work can be performed efficiently even if joint core materials constituted by joining a single split core material or multiple split core materials are heavy in places subject to height restrictions, and a core material building-in device using the method.SOLUTION: In a core material building-in method in which, when building core materials into drilling holes 2 formed in a ground 1 of a place (site) G where a height restriction H is applied, a core material of a predetermined length which should be built in the drilling holes 2 is split into pieces and split core materials 3a thus split are sequentially joined and built in, the single split core material 3a or joint core materials 3X are built into the drilling holes 2 by being hung down by using a core material building-in device 45 constituted by providing hanging means 5 capable of hanging the joint core materials 3X constituted by joining the single split core material 3a or the multiple split core materials 3a in a frame 4 installed on the ground 1 around openings of the drilling holes 2.SELECTED DRAWING: Figure 1

Description

In the present invention, when the core material is built in the excavation hole formed in the ground of the place subject to the height restriction (short head restriction), the divided core material obtained by dividing the core material into a plurality of parts is sequentially added. The present invention relates to a core material building method and a core material building device used in the method.

There is known a method of building a core material in which a divided core material obtained by dividing a core material into a plurality of parts is sequentially added to a drilling hole formed in the ground of a place (site) subject to height restrictions (patented). Reference 1).
In the core material building method, a supported portion is provided on the side surface side of the divided core material, and the supported portion is suspended by a crane to form a divided core material or a joint core material in which a plurality of divided core materials are joined. Since the position of the tip of the boom of the crane can be lowered during suspension, there is less possibility that the tip of the boom of the crane will collide with an obstacle above when suspending the split core material or the joint core material. Moreover, the length of the split core material can be increased, and the number of times the split core material and the joint core material are suspended and the number of joints can be reduced.

Japanese Unexamined Patent Publication No. 2004-68397

In the core material building method described above, a crane must be used to suspend a single split core material or a joint core material formed by joining a plurality of split core materials. A crane must be used that takes into account the rated total load value at which the material or joint core material can be suspended.
That is, when the weight of a single split core material or a joint core material formed by joining a plurality of split core materials is large, the single split core material or the joint core material having a large weight can be reliably hung. In addition, it is necessary to use a large crane with a capacity that allows the total rated load value of the crane to be sufficiently larger than the weight of the single split core material or joint core material, but in the field where height restrictions are imposed. There is a possibility that the large crane cannot be used due to reasons such as a large suspension allowance (the distance that the split core material suspended by the crane can move upward from the stage where the ground is cut), etc. It may not be possible.
Further, when the weight of the single split core material or the joint core material formed by joining a plurality of split core materials is small, the single split core material or the joint core material can be reliably hung. Since a small crane having a small rated total load value can be used, the core material building work can be efficiently performed by using the small crane even in a place subject to height restrictions. However, when a small crane with a small rated total load value is used, the weight of the single split core material or joint core material that can be suspended is limited, and therefore the weight of the single split core material or joint core material is limited. If is large, it cannot be handled.
In other words, in a place subject to height restrictions, if the weight of the single split core material or the joint core material formed by joining multiple split core materials is heavy, a large crane with a large rated total load value or There is a problem that the core material building work cannot be performed using a small crane with a small rated total load value.
In view of the above problems, the present invention has a core material built-in even when the weight of the joint core material formed by joining a single divided core material or a plurality of divided core materials is large in a place subject to height limitation. The present invention provides a core material building method capable of efficiently performing work, and a core material building device used in the method.

In the core material building method according to the present invention, when the core material is built in the excavation hole formed in the ground in the place where the height is restricted, the core material having a predetermined length to be built in the excavation hole is installed. In the core material building method in which the divided core materials are divided into a plurality of parts and the divided core materials are sequentially added and built, a single divided core material or a plurality of divided core materials are placed on a frame installed on the ground around the hole opening of the excavation hole. The single split core material or the joint core material is hung down by using a core material building device configured by providing a hanging means capable of suspending the joint core material formed by splicing the core material. As a result, it was built in the excavation hole.
Further, in the above-mentioned core material building method, it is not possible to hang a joint core material formed by joining a predetermined number or more of the divided core materials, but a single divided core material or a number of divided cores less than a predetermined number The first step of building the single split core material or the joint core material in the excavation hole using a crane capable of suspending the joint core material formed by splicing the materials into the excavation hole. And, with the upper end side of the single split core material built in the excavation hole or the upper end side of the joint core material fixed to the support portion provided on the hole opening side of the excavation hole, the single division When connecting the upper end of the core material or the upper end of the joint core material and the lower end of the split core material to be added next, the upper end side of the split core material to be added next is connected to the suspending means of the core material building device. The second step of positioning the lower end to the upper end of the single split core material or the upper end of the joint core material using a crane and a core material building device, and after the positioning work, the upper end side is the core material building. A predetermined number or more of the split core materials are spliced by connecting the lower end of the split core material to be added next connected to the suspending means of the crane and the upper end of the single split core material or the upper end of the joint core material. This is a core material building method including a third step of suspending and building the joint core material configured in the above method using a core material building device in the excavation hole.
Further, the core material building device according to the present invention has a core of a predetermined length to be built in the excavation hole when the core material is built in the excavation hole formed in the ground in a place where the height is restricted. It is a core material building device that builds by sequentially adding divided core materials that are divided into a plurality of materials, and is attached to a frame and a frame, and a single divided core material or a plurality of divided core materials are joined. It is equipped with a hanging means capable of hanging the joint core material.
Further, in the above-mentioned core material building method, the suspending means is connected to the chain block and the chain block, and the upper end side of a single divided core material or a plurality of divided core materials are joined to form a joint core. It is provided with a rotatable connecting means connected to the upper end side of the material and rotatably suspending a single divided core material or the joint core material rotatably with a center line extending in the vertical direction of the joint core material as a rotation center. It was configured.
According to the core material building method and the core material building device according to the present invention, even when the weight of the joint core material formed by joining a single divided core material or a plurality of divided core materials is large, The core material building work can be performed efficiently.

The figure which shows the core material building method and the core material building device (the embodiment). (A) is a front view of the core material building device, (b) is a side view of the core material building device, and (c) and (d) are views showing an example of a joint core material (embodiment). The process drawing (execution) which shows the procedure of the building method of the core material. The process drawing (execution) which shows the procedure of the building method of the core material. The process drawing (execution) which shows the procedure of the building method of the core material. The process drawing (execution) which shows the procedure of the building method of the core material.

As shown in FIG. 1, the method of building the core material according to the embodiment is as shown in FIG. 1, an excavation hole formed in the ground 1 of a place (site) G where there is a height limit (empty limit) H such as below the viaduct B. When building the core material in 2, the core material of a predetermined length to be built in the excavation hole 2 is divided into a plurality of pieces, and the divided core materials 3a, 3a ... Are sequentially added. It is a method of building a core material to be built, and is a predetermined number or more on a frame 4 installed on the ground 1 around the hole opening of the excavation hole 2, for example, on a lining plate 13 laid on the ground 1. Using the core material building device 45 configured by providing the hanging means 5 capable of suspending the joint core material 3X formed by joining the divided core material 3a, the joint core material 3X is built in the core material. This is a core material building method in which the device 45 is hung by the hanging means 5 so as to be built in the excavation hole 2.

That is, at the site G where the core material is built in the excavation hole 2, if there is a height limit, it is not possible to hang a single core material longer than the height of the height limit (empty head limit) H. Instead of using a crane that has a lifting capacity (rated total load value) that can suspend a single core material that is longer than the limit value H, a crane that has a smaller lifting capacity than the crane is used.
In the method of building the core material according to the embodiment, the length and weight of the divided core material 3a are determined in accordance with the height limitation, and at least one divided core material 3a can be suspended. The crane 20 to be used (see FIG. 3A) is selected in consideration of the capacity and the suspension allowance.
Further, according to the capacity of the selected crane 20, the joint core material 3X formed by joining a predetermined number or more of the divided core materials 3a (for example, three divided core materials 3a, 3a, 3a are joined as described later). Joint core material 3X (second joint core material 3X) and joint core material 3X (third joint core material 3X) composed of four divided core materials 3a, 3a, 3a, 3a spliced together. Since 3X)) cannot be hung, the work of suspending the joint core material 3X and building it in the excavation hole 2 is performed by using the core material building device 45.

The core material building device 45 has a hanging ability capable of suspending the frame 4 and the joint core material 3X which is attached to the frame 4 and is formed by splicing a predetermined number or more of the divided core materials 3a. The configuration is provided with the hanging means 5.

The frame 4 is a structure assembled by connecting members to be a frame, that is, a structure such as a rigid frame frame, a brace frame, a truss frame, and an arch frame.
The frame 4 is formed, for example, in the shape of a rectangular parallelepiped frame in which shaped steel as a frame is combined. For example, it is formed in the shape of a rectangular parallelepiped frame composed of a quadrangular lower frame, a quadrangular upper frame, and four pillars connecting the four corners of the lower frame and the four corners of the upper frame.
Specifically, for example, as shown in FIGS. 2 (a) and 2 (b), the lower frames are provided on the front and rear lower beam members 41 and 41 and on the left and right above the lower beam members 41 and 41. It is composed of left and right lower girder members 42, 42 connecting the members 41, 41, and the upper frame is provided on the left and right below the front and rear upper beam members 43, 43 and the upper beam members 43, 43. It is composed of left and right upper girder members 44, 44 connecting the members 43, 43, and the four corners of the lower frame and the four corners of the upper frame are connected by four pillar members 46, 46 ... 46, 46 are formed in a rectangular frame shape having a structure in which the braces materials 48, 48 are reinforced with each other. The left and right hanging girder members 47, 47 provided on the left and right sides above the upper beam members 43, 43 and connecting the upper beam members 43, 43 are provided, and the left and right hanging girder members 47, 47 are described later, respectively. Electric chain blocks 50, 50 to be installed are attached.

The suspension means 5 is, for example, the upper end of a joint core material 3X which is connected to a plurality of electric chain blocks 50, 50 and each electric chain block 50, 50 and is formed by joining a predetermined number or more of the divided core materials 3a. A configuration including a rotatable connecting means 60 (see FIG. 6) that is connected to the side and rotatably suspends the joint core material 3X around a center line 3XC that extends the joint core material 3X in the vertical direction. did.
Specifically, as shown in FIG. 6, the suspending means 5 is composed of, for example, two electric chain blocks 50 and 50 and a rotatable connecting means 60.

As shown in FIGS. 2A and 2B, for example, the electric chain block 50 includes a load chain 51, a hoisting machine motor 52 for hoisting and manipulating the load chain 51, and a load chain 51. It includes a chain bucket 53 for storing, a hook 54 for hanging provided at the lower end of the load chain 51, a hoisting machine electrical component box 55, and a hoisting machine operation unit 56.

As shown in FIG. 6, for example, the rotatable connecting means 60 has a connecting plate 61 connected to hooks 54 and 54 of the two electric chain blocks 50 and 50, and a joint core having an upper end connected to the connecting plate 61 and a lower end connected to the connecting core 61. The configuration is provided with a swivel joint 62 connected to the upper end of the material 3X.
In this way, since the joint core material 3X is suspended by the two electric chain blocks 50 and 50 via the swivel joint 62, it is easy to adjust the inclination and posture of the joint core material 3X, and the build-in accuracy of the joint core material 3X. Can be improved.

The core material building method is carried out, for example, in the case of constructing a columnar underground continuous wall.
For example, the roadbed of the road at the site G is removed to form a groove 10 extending along the planned direction in which the excavation holes 2 for forming the columnar underground continuous wall are arranged. Next, the upper side of the groove 10 is expanded in diameter to form an installation surface 12 (see FIG. 3) for installing the lining girder 11. Then, the lining plate 13 is laid over the upper parts of the lining girders 11 and 11 installed on the installation surface 12 so as to face each other through the groove 10.
Then, the lining plate 13 of the portion forming the excavation hole 2 is removed to form the work opening 14, and the excavation bit attached to the tip of the boring rod of the boring machine is rotated by using a boring machine (not shown). The stabilizing liquid is supplied to the excavation bit side while drilling the ground 1. In addition, the excavated earth and sand is discharged by a sand pump (not shown) installed on the hole opening side. The discharged earth and sand are sifted to separate the stabilizer, and the stabilizer is circulated for use. After the excavation is completed, the slime treatment in the excavation hole 2 is performed, and then a plurality of divided core materials 3a, 3a ... Are joined in the excavation hole 2 instead of the one core material 3 having a predetermined length. After the constructed joint core material 3X having a predetermined length is built, mortar is placed in the excavation hole 2 to create a pile. By constructing a plurality of these piles so as to be lined up side by side, a column-type underground continuous wall is created.

Specific examples of the construction procedure of the core material building method according to the embodiment will be described in detail with reference to FIGS. 3 to 6.
In the specific example, the airborne limit H of the site G under the viaduct B is 4.7 m, and one core material having a predetermined length to be built in the excavation hole 2 is, for example, a length. Since it is an extra-thick H-shaped steel of 11.5 m, a case where it is necessary to divide the core material for construction will be illustrated.
For example, among the drill holes 2, 2 ... Formed so as to be lined up in order from a predetermined location on the ground 1 of the site G, for example, as shown in FIG. 2 (c), they are built into the odd-numbered drill holes 2, 2 ... The leading core material is formed into four divided core materials 3a having a length a = 2.7 m, a length a = 2.7 m, a length a = 2.7 m, and a length b = 3.4 m from the top. Of the drilling holes 2, 2 ... Formed so as to be arranged in order from a predetermined location on the ground 1 of the site G while being divided, for example, as shown in FIG. 2D, the even-numbered drilling holes 2, 2 ... The trailing core material 3 to be built is divided into four divided core materials having a length b = 3.4 m, a length a = 2.7 m, a length a = 2.7 m, and a length a = 2.7 m from the top. An example will be described in which a joint core material 3X having a predetermined length, which is divided so as to be 3a and is formed by sequentially adding the divided core materials 3a, 3a ... Divided into four parts, is built in the drilling hole 2.
In this case, the joint core material 3X having the predetermined length has a total weight of 6.3 tons including the splicing plate 16 and a short head limit H of 4.7 m, which limits the selection of the crane 20. receive.

First, the following operations (1) and (2) are performed using, for example, a crawler crane 20 having a maximum lifting load of 4.9 t, a working radius of 2.1 m, and a boom length of 4.63 m.
(1) The work of suspending the first divided core material (divided core material to be installed at the position closest to the bottom of the excavation hole 2) 3a into the excavation hole 2. That is, the work of suspending the first divided core material 3a of 3.4 m (about 1.86 t) into the odd-numbered excavation hole 2, or the first divided core material 3a of 2.7 m (about 1.48 t). Work to hang it in the even-numbered excavation hole 2.
(2) A first joint core material 3X in which the next divided core material 3a is added to the upper end of the first divided core material 3a, that is, a joint core material 3X formed by joining two divided core materials 3a and 3a. Work of suspending (6.1 m (about 3.34 t) or 5.4 m (about 2.96 t)) into the excavation hole 2.

The rated total load of the above-mentioned crawler crane 20 is, for example, 4.9 tons with a working radius of 2 mm under the condition of static suspension, but 3.8 tons with a working radius of 2.5 mm and 2.9 tons with a working radius of 3.0 mm. It is 2.29t with a working radius of 3.5mm.
Therefore, the crawler crane 20 is used to excavate the second joint core material 3X formed by joining the following operations (3) and (4) (three or more divided core materials 3a, 3a ...). Since it is difficult to carry out the work of suspending and building in the hole 2, the following works (3) and (4) are carried out by using the core material building device 45.
(3) A second joint core material 3X in which a third divided core material 3a is added to the upper end of a first joint core material 3X formed by joining two divided core materials 3a, 3a ..., That is, 3 The second joint core material 3X (8.8 m (about 4.82 t) or 8.1 m (about 4.44 t)) formed by joining the two divided core materials 3a, 3a, 3a is inserted in the excavation hole 2. Work to hang on.
(4) A third joint core material 3X in which a fourth divided core material 3a is added to the upper end of a second joint core material 3X formed by joining three divided core materials 3a, 3a, 3a, that is, By connecting the four divided core materials 3a, 3a, 3a, and 3a to a predetermined length to be built in the excavation hole 2 (the same predetermined length as the original core material). Work of suspending the formed joint core material 3X (11.5 m (6.3 t)) into the excavation hole 2.
That is, in this case, the joint core material 3X formed by joining a predetermined number or more of the divided core materials 3a that can be suspended by the core material building device 45 is joined by the divided core materials 3a having a predetermined number of 3 or more. It is a joint core material 3X composed of. In other words, the crawler crane 20 selected in this case cannot suspend the joint core material 3X formed by joining three or more divided core materials 3a, but a single divided core material 3a or a predetermined number. It is a crane capable of suspending a smaller number of divided core materials 3a, that is, a joint core material 3X formed by joining two or less divided core materials 3a into the excavation hole 2.

That is, first, as shown in FIG. 3A, the first split core material 3a is excavated by suspending the first split core material 3a using a crawler crane 20 having a maximum lifting load of 4.9 t. While building in the hole 2, the upper end side of the first split core member 3a is fixed to the support portions 15 and 15 (see FIG. 4A) installed so as to straddle the groove 10. That is, as shown in FIG. 3B, the upper end side of the first split core material 3a is fixed to the support portions 15 and 15 and hung from the support portions 15 and 15.

Similarly, using a crawler crane 20 with a maximum lifting load of 4.9 tons, the second split core material 3a is lifted and 2 is attached to the upper end of the first split core material 3a fixed to the support portions 15 and 15. After positioning the lower end of the second divided core material 3a, as shown in FIG. 4A, the upper end side of the first divided core material 3a and the lower end of the second divided core material 3a are used by using the splicing plate 16. Connect with the side.
Then, as in FIG. 3B, the first joint core material 3X formed by joining the first divided core material 3a and the second divided core material 3a connected by the splicing plate 16 is excavated. It is built in the hole 2, and the upper end side of the first joint core material 3X is fixed to the support portions 15 and 15 and hung from the support portions 15 and 15.

Next, a positioning operation is performed in which the upper end side is fixed to the support portions 15 and 15 and the lower end of the third split core material 3a is positioned at the upper end of the first joint core material 3X suspended in the excavation hole 2.
In performing this positioning work, first, as shown in FIG. 4B, the crawler crane 20 is used to move the frame 4 of the core material building device 45 to a position directly above the wellhead of the excavation hole 2. ..
At this time, as shown in FIG. 4B, the first one is so that the lower girder member 42 of the frame 4 does not collide with the upper end portion of the first joint core material 3X built in the excavation hole 2. The first joint core material 3X is fixed to the support portion 15 in a state where the upper end 3t of the joint core material 3X is positioned below the lower girder member 42.
Then, the frame 4 of the core material building device 45 is moved to a position directly above the wellhead of the excavation hole 2 and placed on the lining plate 13 laid directly above the wellhead of the excavation hole 2. After installation, the crawler crane 20 is used to move the third split core material 3a to the temporary storage location 17 near the frame 4.

Next, as shown in FIG. 5A, the upper end 3t of the first joint core material 3X is positioned above the lower girder member 42 of the frame 4 so that the joint work can be facilitated. After moving the joint core material 3X of No. 1 upward, the first joint core material 3X is fixed to the support portions 15 and 15.
Then, as shown in FIG. 5A, hooks 54, 54 of the electric chain blocks 50, 50 are attached to the hanging portions 3d, 3d provided on both side surfaces near one end side of the third divided core member 3a. By driving each of the electric chain blocks 50 and 50 with the other end 3e side of the third divided core material 3a suspended by the crawler crane 20, the third divided core material 3a is hung. A positioning operation is performed in which the lower end of the third split core material 3a is positioned on the upper end of the first joint core material 3X by suspending it above the joint core material 3X of 1.
After that, as shown in FIG. 5B, the splicing plate 16 was used to join the upper end side of the first joint core material 3X and the lower end side of the third split core material 3a. 2 constitutes the joint core material 3X.

Then, as shown in FIG. 6A, a second joint core material is attached to the hooks 54, 54 provided at the lower ends of the load chains 51, 51 of the electric chain blocks 50, 50 via the rotatable connecting means 60. After connecting the upper end side of the 3X, as shown in FIG. 6B, the electric chain blocks 50 and 50 are operated to suspend the second joint core material 3X into the excavation hole 2, thereby suspending the second joint core material 3X into the excavation hole 2. Build inside.
That is, the hooks 54 and 54 of the electric chain blocks 50 and 50 are connected to the left and right sides of the upper surface of the connecting plate 61, the upper connecting portion of the swivel joint 62 and the center of the lower surface of the connecting plate 61 are connected, and the swivel is connected. After connecting the lower connecting portion of the joint 62 and the upper end portion of the joint core material 3X, the electric chain blocks 50 and 50 are operated to suspend the joint core material 3X into the excavation hole 2.

Similarly, as shown in FIGS. 4 (b), 5 (a), and (b), the upper end side of the second joint core material 3X and the lower end side of the fourth split core material 3a are connected. After constructing the third joint core material 3X, that is, the joint core material 3X having the same predetermined length as the one core material 3 having a predetermined length that should have been built in the drilling hole, FIG. 6 ( As shown in a), the upper end side of the third joint core material 3X is attached to the hooks 54, 54 provided at the lower ends of the load chains 51, 51 of the electric chain blocks 50, 50 via the rotatable connecting means 60. After the connection, as shown in FIG. 6B, the electric chain blocks 50 and 50 are operated to suspend the joint core material 3X having the predetermined length in the excavation hole 2 to build the joint core material 3X in the excavation hole 2. Include.
As described above, the joint core material 3X having a predetermined length to be built in one excavation hole 2 is built.

That is, in the method for building the core material according to the embodiment, the joint core material 3X formed by joining a predetermined number or more of the divided core materials 3a cannot be hung, but a single divided core material 3a or a predetermined number Using a crane 20 capable of suspending a joint core material 3X formed by joining a smaller number of divided core materials 3a into the excavation hole 2, the single divided core material 3a or the joint The first step of building the core material 3X in the excavation hole 2 and the upper end side of the single joint core material 3X built in the excavation hole 2 or the upper end side of the joint core material 3X are holes in the excavation hole 2. When connecting the upper end of the single split core material 3a or the upper end of the joint core material 3X and the lower end of the split core material 3a to be added next in a state of being fixed to the support portions 15 and 15 provided on the mouth side. In addition, the lower end of the split core material 3a to be added next, whose upper end side is connected to the suspension means 5 of the core material building device 45, is positioned at the upper end of the single split core material 3a or the upper end of the joint core material 3X. The positioning work is performed in the second step using the hanging means 5 of the crane 20 and the core material building device 45, and after the positioning work, the upper end side is connected to the hanging means 5 of the core material building device 45 and then added. A joint core material 3X formed by connecting the lower end of the divided core material 3a to the upper end of the single divided core material 3a or the upper end of the joint core material 3X and connecting a predetermined number or more of the divided core materials 3a. The method includes a third step of building in the excavation hole 2 by suspending the core material building device 45 by the hanging means 5.

According to the embodiment, even when the weight of the joint core material 3X formed by joining a predetermined number or more of the divided core materials 3a is large at the site where the height is restricted, the core material building work can be efficiently performed. It is possible to provide a core material building method and a core material building device 45 used in the method.

Further, according to the core material building device 45, since the divided core material 3a can be suspended not at the crown but at the side portion, a joint core material 3X having a predetermined length to be built in the excavation hole 2 is configured. Since the number of the divided core materials 3a to be formed can be reduced, the number of operations for connecting the divided core materials 3a and 3a arranged above and below using the splicing plate 16 can be reduced, and the divided core material connecting work is performed. Since the time can be shortened, the construction cycle can be shortened and the core material building work can be performed efficiently.

Further, in the building work with the crawler crane 20, it takes time to adjust the building position of the split core material and the joint core material and the center of gravity of the load of the hook of the crawler crane 20 each time. By using the device 45, the building accuracy can be improved by installing the core material building device 45 at a predetermined position. Further, since the joint core material 3X is built by using the suspending means 5 provided with the two electric chain blocks 50 and 50 and the swivel joint 62, the final fitting position of the joint core material 3X is finely adjusted, that is, , The inclination and posture of the joint core material 3X can be easily adjusted, and the building accuracy of the joint core material 3X can be further improved.

Further, the structure and size of the core material building device 45 can be manufactured so as to satisfy the conditions according to the environment of the site G subject to the height restriction H and the weight of the joint core material 3X.

Further, according to the core material building method according to the present invention, the core material is built on the day of construction even in a narrow and peculiar construction environment such as a tunnel or a subway yard, or under conditions where a place for placing the core material building device cannot be secured. It becomes possible to manufacture a building device and perform core material building work.

The hanging means 5 may be composed of three electric chain blocks 50, 50, 50 ... And a rotatable connecting means 60.

Further, the suspending means 5 may be configured by a structure that does not include the rotatable connecting means 60, that is, only an electric chain block.

Further, the suspending means 5 may be configured by using a manual chain block instead of the electric chain block.

Further, the lifting means 5 may be configured by using a small lifting machine other than the crane, for example, a small lifting machine such as a winch or a clamp, instead of the chain block.

Further, in the above, an example in which the joint core material 3X formed by joining the first divided core material 3a and the next divided core material 3a is built in the excavation hole 2 by using the crane 20. As shown, even if the joint core material 3X formed by joining the first divided core material 3a and the next divided core material 3a is built in the excavation hole 2 by using the core material building device 45. Good. That is, the joint core material 3X formed by joining the divided core materials 3a having a predetermined number of 2 or more may be built in the excavation hole 2 by using the core material building device 45.
Further, a single core material 3X may be built in the excavation hole 2 by using the core material building device 45.
That is, in the core material building method of the present invention, a joint core material 3X formed by joining a single divided core material 3a or a plurality of divided core materials 3a is excavated by using the core material building device 45. It may be built in the hole 2.
Further, the core material building device of the present invention is attached to the frame 4 and the frame 4, and suspends a single divided core material 3a or a joint core material 3X formed by connecting a plurality of divided core materials 3a. It may be configured to include the suspending means 5 capable of capable.
Even with such a core material building method or a core material building device, a joint core material formed by joining a single divided core material or a plurality of divided core materials at a site subject to height restrictions. When the weight is large, the effect that the core material building work can be efficiently performed can be obtained.

1 Ground, 2 Drilling holes, 3a Divided core material, 3X joint core material, 3XC center line,
4 Framing, 5 Suspension Means, 20 Cranes, 45 Core Material Building Equipment,
50 Electric chain block, 60 Rotatable connection means, G site (location),
H height limit.

Claims (4)

When the core material is built in the excavation hole formed in the ground of the place subject to height restriction, the core material of a predetermined length to be built in the excavation hole is divided into a plurality of divided core materials. In the core material building method, which is built by sequentially adding
A frame installed on the ground around the opening of the excavation hole is provided with a suspending means capable of suspending a single split core material or a joint core material formed by joining a plurality of split core materials. A method for building a core material, which comprises suspending the single divided core material or the joint core material so as to be built in the excavation hole by using the core material building device. It is not possible to hang a joint core material formed by joining a predetermined number or more of divided core materials, but a single divided core material or a joint core formed by joining a number of divided core materials less than a predetermined number The first step of building the single split core material or the joint core material in the drilling hole using a crane capable of suspending the material in the drilling hole.
The single split core material is in a state where the upper end side of the single split core material built in the excavation hole or the upper end side of the joint core material is fixed to the support portion provided on the hole opening side of the drill hole. When connecting the upper end of the joint core material or the upper end of the joint core material and the lower end of the split core material to be added next, the lower end of the split core material to be added next is connected to the suspension means of the core material building device. The second step of positioning the upper end of the single split core material or the upper end of the joint core material using a crane and a core material building device, and
After the positioning work, the upper end side is connected to the suspending means of the core material building device, and the lower end of the split core material to be added next is connected to the upper end of the single divided core material or the upper end of the joint core material. Claim 1 is provided with a third step of suspending a joint core material formed by joining a number or more of divided core materials using a core material building device and building it in an excavation hole. The core material building method described in. When building a core material in a drilling hole formed in the ground of a place subject to height restrictions, a split core material in which a core material of a predetermined length to be built in the drilling hole is divided into a plurality of parts is sequentially added. It is a core material building device that is built in this way.
Framing and
A core material building device that is attached to a frame and is provided with a hanging means capable of suspending a single divided core material or a joint core material formed by joining a plurality of divided core materials. .. The hanging means is
With a chain block
It is connected to the chain block and is connected to the upper end side of a single divided core material or the upper end side of a joint core material formed by joining a plurality of divided core materials, and is connected to the single divided core material or the joint. The core material building device according to claim 3, further comprising a rotatably connecting means for suspending the core material rotatably with a center line extending in the vertical direction of the joint core material as a rotation center.

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