JP6918265B1 - Steel holding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel material holding device capable of burying a steel material in a soil cement formed on the ground while maintaining a vertical state. SOLUTION: A base portion 11, a pair of holding portions 12a, 12b extending downward from the base portion 11 and having a gap g having a predetermined width into which a steel material S can be inserted, and a steel material S inserted into the gap g are provided. A pressing member 13 that is pressed against the holding portion 12a on one side of the pair of holding portions 12a and 12b and held between the holding portions 12a and 12b, and is extended upward from the base portion 11 and the steel material S is embedded in the ground G. The structure is such that the exposed portion 14 is exposed above the ground surface when the ground surface is formed. [Selection diagram] Fig. 1

Description

The present invention relates to a steel material holding device used when burying a steel material in the ground.

At construction sites such as construction works, for the formation of earth retaining walls that prevent earth and sand from collapsing from the adjacent land side of the construction site to the construction site side during ground excavation work, and for foundation work that supports the building. Work is carried out to bury steel materials such as H-shaped steel and steel sheet piles in the ground. In this work, for example, as shown in Patent Document 1 below, the core material 1 is hung in a ground improvement body 7 (a mud-like material in which cement milk and the earth and sand of the ground are mixed) formed on the ground. It is buried in the ground improvement body 7 by the weight of the core material 1.

At the lower end of the core material 1, an air injection pipe 2 for injecting compressed air A supplied from the air compressor 5 is installed. When compressed air A is injected from the air injection pipe 2 when the core material 1 is buried, the unsolidified ground improvement body 7 is in a stirring state, and the frictional resistance generated between the side surface of the core material 1 and the ground improvement body 7 is generated. Is reduced. Therefore, it is said that the core material 1 can be smoothly moved downward (see, in particular, paragraphs 0035 to 0037 and FIG. 3 of Patent Document 1).

Japanese Unexamined Patent Publication No. 2018-100501

The ground improvement body 7 may contain relatively large foreign substances such as rocks. In the configuration shown in Patent Document 1, it is difficult to move such a foreign substance by injecting compressed air A, and the foreign substance may come into contact with the lower end of the core material 1. Then, the lower end side of the core material 1 may be displaced sideways, and the core material 1 may be tilted with respect to the axial center of the ground improvement body 7. Moreover, the core material 1 is often buried deeply until it is completely embedded in the ground improvement body 7, and even if the core material 1 is tilted in the ground improvement body 7, it can be visually confirmed. However, it may interfere with the subsequent process.

Therefore, an object of the present invention is to bury a steel material in soil cement formed on the ground while maintaining a vertical state.

In order to solve the above problems, the present invention comprises a base portion, a pair of holding portions extending downward from the base portion and having a gap having a predetermined width into which a steel material can be inserted, and the sandwiched portion inserted into the gap. A pressing member that presses a steel material against one of the pair of holding portions to hold it between the two holding portions, and a ground surface that extends upward from the base portion and is embedded in the ground. A steel material holding device having an exposed portion exposed above the surface was constructed.

By pressing the steel material against the holding portion on one side with the pressing member in this way, the steel material can be reliably held during embedding in soil cement. Further, even if the steel material is inclined, the degree of the inclination can be confirmed by visually observing the exposed portion, and the inclination can be quickly corrected. Therefore, the vertical state of the steel material in the soil cement can be maintained.

In the above configuration, the pressing member is a cylinder device provided in the holding portion on the other side of the pair of holding portions, and the rod of the cylinder device appears and disappears toward the holding portion on the one side. The configuration can be such that it is possible.

In this way, by operating the cylinder device, it is possible to smoothly press the steel material against the holding portion on one side (hold the steel material) and release the steel material.

In each of the above configurations, an auger device is further provided above the exposed portion, and the pair of sandwiching portions can be rotated around the rotation axis of the auger device when the steel material is embedded in the ground. Can be done.

In this way, even if foreign matter such as rocks is present near the lower end of the steel material, the foreign matter can be moved from directly below the lower end of the steel material by the rotational force around the rotation axis given to the steel material by the auger device. can. Therefore, the burial work can be continued while preventing the steel material from tilting from the vertical state due to the foreign matter.

In each of the above configurations, the height of the lower end of the sandwiching portion on one side of the pair of sandwiching portions and the height of the lower end of the sandwiching portion on the other side may be different.

In this way, the upper end of the steel material can be once abutted against the inner surface of the holding portion on the long side downward of the pair of holding portions, and then the steel material can be guided to the gap between both holding portions. The work of inserting the steel material into the can be performed smoothly.

In each of the above configurations, the steel material may be H-shaped steel or a steel sheet pile, and the pair of sandwiching portions may sandwich the webs.

In this way, the steel material can be stably held by the pair of sandwiching portions.

In the present invention, since the steel material to be embedded is pressed against the sandwiching portion on one side by the pressing member to be reliably held between the sandwiching portions, the steel material can be reliably held during embedding in soil cement. .. Further, since the exposed portion is provided, even if the steel material is inclined, the degree of inclination can be confirmed by visually observing the exposed portion, and the inclination can be quickly corrected. Therefore, it is possible to maintain the vertical state of the steel material embedded in the soil cement and not directly visible.

A cross-sectional view of the steel material holding device according to the present invention is shown, (a) is a state in which a steel material is not sandwiched, and (b) is a state in which a steel material (H-shaped steel) is sandwiched. Cross-sectional view taken along line II-II in FIG. 1 (a) A perspective view of the steel material holding device shown in FIG. 1 (b). A cross-sectional view showing a state in which H-section steel is embedded in soil cement using the steel material holding device shown in FIG. 1 (a). Cross-sectional view taken along the line VV in FIG. (A) is a cross-sectional view showing a modified example of the steel material holding device shown in FIG. 1 (a), and (b) is a cross-sectional view showing an intermediate stage of sandwiching the H-shaped steel. A cross-sectional view showing a state in which a steel material (steel sheet pile) is sandwiched between the steel material holding devices shown in FIG. 1 (a). A cross-sectional view showing a state in which the steel material holding device shown in FIG. 1 (a) is suspended by a wire.

An embodiment of the steel material holding device 10 according to the present invention will be described with reference to the drawings. As shown in FIG. 1A, the steel material holding device 10 has a base portion 11, a pair of holding portions 12a and 12b, a pressing member 13, and an exposed portion 14 as main components. In the following, of the pair of sandwiching portions 12a and 12b, the sandwiching portion on one side is designated by the reference numeral 12a, and the sandwiching portion on the other side is designated by the reference numeral 12b to distinguish between the two.

The base 11 is a disk-shaped member made of steel. A pair of holding portions 12a and 12b, an exposed portion 14, and the like are attached to the base portion 11 as a base.

The pair of holding portions 12a and 12b are steel members extending downward from the base portion 11. The sandwiching portions 12a and 12b have a horizontal cross section of a square shape and a shape in which the lower end side is closed. As shown in FIGS. 1A and 2B, the steel material S (for example, the web W of the H-shaped steel (hereinafter, the same reference numeral as the steel material S)) is between the sandwiching portions 12a and 12b facing each other. A gap g (for example, about 20 to 40 mm) having a predetermined width into which the steel can be inserted is formed. An inclined surface 15 is formed on the lower end side thereof so that the size of the gap g increases toward the lower end side so as to face the opposite holding portions 12a and 12b. By forming the inclined surface 15 at the lower ends of the sandwiching portions 12a and 12b, the steel material S can be smoothly inserted into the gap g.

The pressing member 13 is provided inside the sandwiching portion 12b on the other side of the pair of sandwiching portions 12a and 12b. The pressing member 13 is a pair of holding portions 12a and 12b from the main body portion 13a through a main body portion 13a fixed inside the holding portion 12b and a through hole formed in the holding portion 12b on the other side thereof. It is a hydraulic cylinder device (hereinafter, the same reference numerals as those of the pressing member 13) having a rod 13b that appears and disappears toward the holding portion 12a on one side.

As shown in FIG. 1 (b), when the rod 13b is projected from the rod 13b with the web W of the H-shaped steel S inserted in the gap g between the pair of sandwiching portions 12a and 12b, the web W is projected from the rod 13b. The web W is pressed against the inner surface of one of the holding portions 12a by the pressing force acting on the web W. As a result, the upper end of the H-shaped steel S is sandwiched and securely held by the pair of sandwiching portions 12a and 12b.

The shapes of the pair of holding portions 12a and 12b according to the present embodiment are merely examples, and the shapes can be appropriately changed as long as the steel material S can be reliably held by the pair of holding portions 12a and 12b. .. For example, the inclined surface 15 at the lower ends of the holding portions 12a and 12b can be omitted.

The exposed portion 14 is a steel member extending upward from the base portion 11. The exposed portion 14 has a portion exposed above the ground surface when the steel material S is embedded in the ground G (see FIG. 4). An auger device 16 that rotates the entire steel material holding device 10 about an axis is provided above the exposed portion 14. By providing the auger device 16, when the steel material S is embedded in the ground G, the pair of holding portions 12a and 12b can be rotated around the rotation axis of the auger device 16 as needed (in FIG. 1B). See arrow r).

In the burying work of the steel material S using the steel material holding device 10, first, as shown in FIGS. 1 (b) and 3, the upper end of the steel material S (here, the H-shaped steel S) is held by a pair of holding portions 12a. After inserting into the gap g between 12b, the rod 13b of the cylinder device 13 is projected, and the steel material S is pressed against the holding portion 12a on one side.

In the ground G, a columnar body made of soil cement C formed by stirring and mixing the excavated earth and sand of the ground G and cement milk or the like to form a muddy soil is formed. Then, the steel material S held by the pair of sandwiching portions 12a and 12b is submerged in the unsolidified soil cement C mainly by its own weight.

As shown in FIG. 4, since the entire steel material S is embedded in the soil cement C, even if the steel material S is tilted in the soil cement C, it cannot be directly visually recognized from the ground. Can not. In the steel material holding device 10 according to the present invention, since an exposed portion 14 exposed above the ground surface when the steel material S is embedded in the ground G is provided above the base portion 11, the exposed portion 14 is placed on the ground. By visually confirming whether or not the steel material S is tilted, it is possible to estimate whether or not the steel material S is tilted. Therefore, even if the steel material S starts to incline during the burial work, the inclination can be quickly corrected and the vertical state of the steel material S in the soil cement C can be maintained.

When the steel material S is embedded in the soil cement C, foreign matter X such as rocks in the soil cement C may come into contact with the lower end of the steel material S, and the steel material S may be inclined from the vertical direction. In the steel material holding device 10 according to the present invention, an auger device 16 is provided above the exposed portion 14, and as shown in FIG. 5, the auger device 16 makes the steel material S rotatable around a rotation axis (in FIG. 5). (Refer to the arrow r), the foreign matter X directly below the lower end of the steel material S can be moved (see the arrow m in FIG. 5), and the steel material S can be buried vertically.

When the steel material S is an H-shaped steel S, it is preferable that the rotation angle of the auger device 16 is set within a relatively small range of, for example, about ± 10 degrees so that a large twist does not act on the H-shaped steel S.

A modified example of the steel material holding device 10 shown in FIG. 1 (a) is shown in FIG. 6 (a). The steel material holding device 10 according to this modified example has the same basic configuration as that shown in FIG. 1 (a), but has a holding portion 12a on one side and a holding portion 12a on the other side of the pair of holding portions 12a and 12b. The difference is that the height of the lower end of the sandwiching portion 12b is different. Specifically, the holding portion 12a on one side is extended downward longer than the holding portion 12b on the other side.

When, for example, the H-shaped steel S is sandwiched by the steel material holding device 10, as shown in FIG. 6B, the web W of the H-shaped steel S approaches the inner surface of the lower end portion of the holding portion 12a on one side from the horizontal direction. Let me hit you. Then, the H-shaped steel S is slid upward (or the steel material holding device 10 is moved downward) while being abutted, and the web W is inserted into the gap g between the pair of holding portions 12a and 12b.

In the steel material holding device 10 shown in FIG. 1A, it is necessary to accurately align the upper end position of the steel material S with the inclined surfaces 15 formed at the lower ends of the pair of holding portions 12a and 12b. According to the configuration shown in (a), by abutting the web W against the lower end of the holding portion 12a on one side, accurate alignment is not required, and the steel material S can be smoothly inserted.

In the above embodiment, an example in which the H-shaped steel S is held as the steel material S has been described, but as shown in FIG. 7, the steel material S is a steel sheet pile (hereinafter, the same reference numerals as those of the steel material S). There may be. Also in this case, the steel sheet pile S can be stably held by sandwiching the web W of the steel sheet pile S between the pair of holding portions 12a and 12b. In this way, by making the steel sheet pile S rotatable around the rotation axis by the auger device 16 while being held by the steel material holding device 10, the work of burying the steel sheet pile S in the soil cement C and the work of connecting the steel sheet piles S at the joint portion J are performed. Can be done smoothly.

In the above embodiment, the auger device 16 is provided above the exposed portion 14, and the steel material S is configured to be rotatable around the rotation axis by the auger device 16. However, as shown in FIG. 8, the exposed portion 14 is provided. It can also be suspended by a wire 17. In this case, the steel material S cannot be rotated around the rotation axis as in the case where the auger device 16 is provided, but the inclined state of the steel material S can be estimated by visually observing the exposed portion 14.

In the above embodiment, one pressing member 13 is provided on the sandwiching portion 12b on the other side of the pair of sandwiching portions 12a and 12b, but a plurality of pressing members 13 are provided to more reliably make a steel material. It is also possible to have a configuration in which S can be held. Further, the pair of holding portions 12a and 12b may be movable and detachable, and the steel material S inserted in the gap g between the pair of holding portions 12a and 12b may be sandwiched by the pressing force of the pressing member 13. can.

The embodiments disclosed this time should be considered to be exemplary in all respects and not restrictive. Therefore, the scope of the present invention is indicated by the scope of claims rather than the above description, and it is intended that all modifications within the meaning and scope equivalent to the scope of claims are included.

10 Steel material holding device 11 Base 12a (one side) holding part 12b (other side) holding part 13 Pressing member (cylinder device)
13a Main body 13b Rod 14 Exposed part 15 Inclined surface 16 Auger device 17 Wire G Ground S Steel material (H-shaped steel, steel sheet pile)
W (steel) web

Claims (5)

With the base (11)
A pair of holding portions (12a, 12b) extending downward from the base portion (11) and forming a gap (g) having a predetermined width into which the steel material (S) can be inserted.
The steel material (S) inserted into the gap (g) is pressed against the holding portion (12a) on one side of the pair of holding portions (12a, 12b) and between the holding portions (12a, 12b). The pressing member (13) to be held and
An exposed portion (14) extending upward from the base portion (11) and exposed above the ground surface when the steel material (S) is embedded in the ground (G).
Steel material holding device with. The pressing member (13) is a cylinder device (13) provided in the holding portion (12b) on the other side of the pair of holding portions (12a, 12b), and the rod of the cylinder device (13). The steel material holding device according to claim 1, wherein (13b) can appear and disappear toward the holding portion (12a) on one side. An auger device (16) is further provided on the upper side of the exposed portion (14), and when the steel material (S) is embedded in the ground (G), the pair of sandwiching portions (12a, 12b) are placed on the auger device (16). The steel material holding device according to claim 1 or 2, which is rotatable around the rotation axis of). The pair of holding portions (12a, 12b) sandwiching portion of the one side of the (12a), any one of claims 1 to lower the height is different in the clamping portion of the other side in (12b) 3 The steel material holding device described in 1. 3. The steel material holding device according to any one item.

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