JPH10331569A - Steel segment piece with joint box opened to its outer surface and method for constructing sunk body using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a construction method whereby a cylindrical sunk body formed by connecting steel segment pieces is constructed as it is pressed, from a ring-shaped cutting edge installed along its lower edge, into the ground by the excavation of the ground inside it and the application of pressure from above, because the method requires scaffolding provided for connecting work inside the steel segment pieces to be installed and removed each time a process is repeated, so that the scaffolding does not get in the way of an excavator such as a hammer grab bucket when time excavator enters and exits. SOLUTION: A steel segment piece 21 has an approximately square skin plate 31, main girders 32 welded to the upper and lower ends of the square on the inner surface of the skin plate 31, a joint plate 25 welded to the right and left ends of the square, and a joint box 40 which opens to the edge of the skin plate 31. Operators insert hands into the joint box 40 from outside a sunk body to connect the adjacent steel segment pieces 21 together via the main girders 23 or joints. The need for inside scaffolding is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for connecting steel segment pieces and press-fitting them into the ground to construct a submerged body, and more particularly to a structure of the steel segment piece and a method of constructing a submerged body.

[0002]

2. Description of the Related Art Conventionally, there is a technique of constructing a submerged body constituted by connecting steel segment pieces by submerging the submerged body in the ground. The submerged structure includes a shaft, a drainage well, an aquarium, and other structures constructed underground.

[0003] This submerged structure further includes expressways, railway bridges,
Alternatively, it has been proposed to use it for construction of a retaining wall when reinforcing the pier of an overpass or the like for earthquake resistance. That is, the seismic reinforcement of this pier is constructed by connecting a steel segment piece at a predetermined distance around the pier and pressing it into the ground with a hydraulic jack, etc., as a retaining wall, and constructing this pier as a retaining wall. After excavating between the retaining walls, the pier is reinforced with steel plates, concrete drawings, etc., using the space formed by the excavation as a working space.

[0004] The above-mentioned step of constructing a submerged body includes the steps of connecting a steel segment piece in a circumferential direction and a vertical direction at a portion exposed above the ground to form a cylindrical submerged body.
It consists of excavating the ground inside the submerged body, applying pressure from above the steel segment and injecting it into the ground, etc. These steps are repeated to construct the submerged body deep underground.

[0005] The steel segment piece includes a skin plate having a substantially rectangular shape, a main girder welded to the upper and lower edges of the square on the inner surface of the skin plate, and left and right edges of the square. And a welded joint plate.

[0006] The connection of the steel segment pieces is as follows.
It is performed on a scaffold called a work floor which is attached to the inside of the steel segment piece using a main girder or the like. For excavation, excavators such as hammer grab buckets,
This is performed by entering and exiting the inside of a submerged body constituted by steel segment pieces.

Further, the press-fitting equipment for press-fitting includes a press-fitting jack for obtaining a reaction force to a wire or the like connected to a ground anchor driven deep into the ground, a jack cradle or a press-fitting girder for transmitting the force of the press-fitting jack to a submerged body. In order to uniformly transmit the force from the press-fitting girder to the sinking body, a protection ring and the like are provided on the upper edge of the sinking body.

[0008]

However, in the above-mentioned conventional technique, the scaffold for connecting the steel segment pieces is designed so that an excavator such as a hammer grab bucket for excavation does not interfere with the excavator. Each time the process is repeated, installation and removal must be performed. Further, a press-fitting facility is provided above the sinking body constituted by the steel segment pieces, and the work efficiency for attaching and detaching the scaffold is poor.

The present invention has been made to solve the above problems, and does not require a scaffold for connecting a steel segment piece to the inside thereof, and the steel segment piece. It is an object of the present invention to provide a method for constructing a submerged body using the method.

[0010]

Means for Solving the Problems In order to achieve the above objects, the following invention has been made. According to a first aspect of the present invention, a steel substructure in which steel segment pieces connected in a circumferential direction are connected to each other in a vertical direction has a tubular configuration in which a steel ground segment is connected in a vertical direction. By applying pressure from above the segment, in the steel segment piece used in the construction method that is pressed into the ground from a ring-shaped cutting edge installed along the lower edge of the lowermost steel segment and is constructed, The joint box used for the connection operation in the circumferential direction or the vertical direction is a steel segment piece having an opening on the outer surface, the opening being formed on the outer surface.

According to a second aspect of the present invention, there is provided a skin plate having a substantially square shape, a main girder welded to the upper and lower edges of the square on the inner surface of the skin plate, and welding to a left end and a right end of the square. And a joint box opened at an edge of a skin plate for use in a connection operation of connecting adjacent steel segment pieces through the main girder or the connection plate. It is a steel segment piece with a joint box opening on the outer surface.

According to a third aspect of the present invention, the joint box includes a notch formed at an edge of the skin plate,
And a joint box member housed and connected to the cutout portion, wherein the joint box is opened on the outer surface.

A fourth invention is a steel segment piece in which at least a part of the joint box is formed by bending a skin plate, the joint box being opened on an outer surface.

According to a fifth aspect of the present invention, the joint box is provided only on a part of a plurality of connecting portions provided on one steel segment piece, and the joint box is opened on an outer surface. It is a segment piece.

According to a sixth aspect of the present invention, the steel segment piece of the first or second aspect is connected to the steel segment piece in a circumferential direction and a vertical direction by using a joint box opened on the outer surface. A first step of forming a submerged body, and a second step of excavating the ground inside the submerged body and applying pressure from above to press-fit into the ground from a cutting edge at a lower edge, and This is a method of constructing a submerged body using a steel segment piece having a joint box opened on the outer surface, wherein the submerged body is constructed underground by repeating the second step.

According to a seventh aspect of the present invention, the first step is a step of connecting several adjacent steel segment pieces from the inside in advance to form a piece unit, and suspending the piece unit with a crane to attach the piece unit to the outer surface. Using an open joint box to externally connect to another steel segment piece that already constitutes a submerged body, the steel segment piece having an open joint box on its outer surface, This is a method for constructing a submerged body using the method.

An eighth invention is characterized in that after the connection using the joint box is made, the joint box is filled with a filler to reduce peripheral friction generated between the joint box and the ground during subsidence. This is a method of constructing a submerged body using a steel segment piece having a joint box opened on the outer surface to be formed.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. 1, 2, 3, 4, 5, 6, and 7A. In this embodiment, the steel segment piece has the structure shown in FIGS. That is, the steel segment piece 21 is manufactured at a factory, and a pair of parallel straight joint plates 25 are welded to both ends of a pair of parallel curved main girders 23 as shown in FIG. The body is composed.

Further, the frame includes a pair of main girders 2.
One middle main girder 27 is arranged parallel to 3. The center main girder 27 is passed to the joint plate 25 at a predetermined interval. Further, five vertical ribs 29 are arranged in parallel with the joint plate 25. The vertical ribs 29 are spaced from each other by a predetermined distance and are passed to the main girder 23. A skin plate 31 is extended outside the main girder 23, the joint plate 25, the vertical rib 29, and the middle main girder 27 to form a steel segment piece 21.

That is, in other words, the main girder 23 is welded to the inner surface of the skin plate 31, which is curved but has a substantially rectangular shape, at the upper and lower edges of the square, and the left and right edges of the square are formed. The joint plate 25 is welded to the edge.

Inside the vertical rib 27, a backing plate 33 is partially stretched in the center of the steel segment piece 21,
It is possible to prevent the bucket suspended by the wire of the heavy excavating machine from coming into contact with the corner portion of the vertical rib 29 and rebounding and rotating, thereby making it difficult to control the position of the bucket.

Each of the beams 23 and 25 has a bolt hole 35 for connecting the adjacent steel segment pieces 21. At the connection locations where these bolt holes 35 are formed,
A cut-out portion 37 is formed at an end of the skin plate 31, and a joint box member 39 is housed inside the cut-out portion 37 and connected by welding to form a joint box 40.

As shown in FIG. 7, the joint box member 39
Has a U-shaped cross section made of iron, and has a side wall portion 41 surrounding three sides and a back wall portion 43 on the back side. The side wall portion 41 and the bottom end surface of the back wall portion 43 are in contact with and welded to the inside of the joint plate 25 or the main girder 23. Further, the end surface of the side wall portion 41 on the opening 45 side is
It is brought into contact with the inside of the notch 37 and welded. By these weldings, watertightness of the joint box 40 is ensured.

Such a joint box 40 is provided only partially at a plurality of connection points where the bolt holes 35 are formed (see FIG. 1). The position where this is provided differs depending on the shape of a later-described piece unit 5 obtained by connecting a plurality of steel segment pieces 21 in advance (FIGS. 4A and 4B).
(C)).

The above-mentioned piece units 5 are combined and connected to obtain the cylindrical immersion body 1. At this time, the steel segments 2 are configured with the steel segment pieces 21 connected in the circumferential direction (FIGS. 2 and 3). The tubular submerged body 1 is configured in a state where the steel segments 2 are overlapped and connected in the axial direction (FIG. 2).

The steel segment piece, which is the lowermost steel segment piece 21 of the plurality of steel segments 2 to be superimposed, is provided with a ring-shaped blade in advance along a lower edge of the steel segment piece at a factory. Mouth 6 (FIGS. 2 and 3)
Is installed.

The blade opening 6 is located outside of the skin plate by a predetermined dimension, so that the friction cut 7
Is formed. Due to the friction cut 7, the ground is pushed outward with the press-fitting of the steel segments 2, and the resistance due to friction between the skin plate and the ground is reduced.

Next, a construction procedure for connecting the steel segment pieces 21 and submerging the submerged body 1 to construct the submerged body 1 will be described with reference to FIG.

First, a countermeasure for driving a ground anchor (not shown) deep into the ground is performed. A plurality of ring-shaped locations are selected according to the location where the steel segment piece 21 is to be located. A press-fitting facility (not shown) for press-fitting the steel segment piece 21 into the ground 3 using a wire connected to the ground anchor and guided to the ground is prepared.

Thereafter, the lowermost two steel segment pieces 21 suspended by, for example, a crane are temporarily connected from the inside by bolts and nuts passed through bolt holes 35 of the joint plate 25. Due to this temporary connection, the connected steel segment pieces 21 have a sufficient length in the circumferential direction, can stand alone, and are prevented from falling down. The next steel segment piece 21 is temporarily connected to the self-standing steel segment piece 21 in a suspended state.

In this temporarily connected state, the steel segment pieces 21 are welded to each other. Since the cutting edge portions 6 are pre-installed on the two lowermost steel segment pieces 21, the cutting edge portions 6 are connected at the same time. Thus, the ring-shaped blade opening 6 and the lowermost steel segment 2 are configured.

The blade section 6 and the lowermost steel segment 2
Is connected to a second-stage, and possibly a third-stage, steel segment 2 in some cases. This connection is shown in FIG.
This is performed using a piece unit 5 as shown in FIG. That is, several adjacent steel segment pieces 21 are connected from the inside in advance to form the piece unit 5. At this time, the connection from the inside is made of the lowermost steel segment 2
Since it can be performed on the ground away from the place where is located, there is no need to attach a scaffold.

The piece unit 5 is suspended by the crane wire 7 and connected to the lowermost steel segment 2 side. This connection is made from the outside of the steel segment piece 21 by using the joint box 40 opened to the outer surface. That is, as shown in FIG. 6, the worker puts his hand from the joint box 40, and passes the bolt 47 from one side into the bolt hole 35 communicating with the contacted joint plates 25 or the main girders 23, The other nut 49 is screwed and tightened.

Thereafter, the joint box 40 is filled with a filler. Various fillers can be used. Inorganic materials include fast-setting hydraulic materials (special cement), and organic materials include fast-curing polymeric materials (including foamable materials). The lower right one of the steel segment pieces 21 constituting the piece unit 5 of FIG. 4A is shown in FIG. The joint box 40 is not provided at the connection point where the inside connection is performed.

After the lower part of the submerged body 1 is constructed in this manner, pressure is applied from above the uppermost steel segment 2 in this construction state by the press-fitting equipment, and the press-fitting into the ground is performed. Will be

At the same time, the inside of the steel segment 2 is excavated. That is, the inside of the steel segment 2 is excavated by a heavy machine such as a hammer grab bucket or a hydraulic clamshell (not shown) so that the press-fitting is easily performed.

After the press-fitting and excavation are performed, the steel segment 2 of the next stage is connected and formed, and the excavation and press-fitting are performed again. The connection, excavation, and press-fitting are repeated in this manner to form the upper part of the submerged body 1, and the submerged body 1 is constructed deep underground.

According to this embodiment, the following effects can be obtained. That is, the connection of the piece units 5 can be performed from the outside by the joint box 40 opened on the outer surface of the steel segment piece 21, so that it is not necessary to attach a scaffold inside. Thus, the scaffold does not hinder access to an excavator such as a hammer grab bucket for excavation. Also, it is not necessary to attach and detach the scaffold each time the process is repeated.

Further, by connecting several adjacent steel segment pieces 21 in advance to form the piece unit 5, it is possible to increase the number of connection operations performed away from the place where the steel segment 2 configured in advance is located. Work can be performed in parallel, and work efficiency is improved.

Since the connecting operation for forming the piece unit 5 can be performed in an arbitrary work space apart from the place where the steel segment 2 configured in advance is located, the connecting operation can be performed from the inside of the steel segment piece 21 and the scaffold can be formed. There is no need for Also, since connection can be made from the inside, the joint box 4
By reducing the number of zeros, the peripheral friction due to the unevenness of the outer surface caused by providing the joint box 40 can be reduced accordingly.

Further, by filling the joint box 40 with a filler, unevenness can be eliminated or reduced, so that the peripheral surface friction when the immersed body is laid can be reduced. Further, the watertightness of the joint box can be made more satisfactory. In addition, this watertightness is generally required also for the joint box itself. That is, in general construction, it is desired that underground groundwater does not enter the inside of the submerged body, so the joint box itself is required to be watertight, but some construction is performed on the premise that groundwater enters. In that case, strict watertightness is not required.

(Other Embodiments) In the above embodiment, the joint plate 40 is provided by cutting the skin plate 31. In other embodiments, the skin plate 31 is bent instead of the cutout. Joint box 40
May be provided. For example, two cuts can be made in the skin plate 31 and the portion sandwiched between the cuts can be bent inward to form a part of the inner wall of the joint box.

In the above embodiment, the structure of the joint box member 39 is made of iron, has a U-shaped cross section, and has a side wall portion 41 surrounding three sides and a back wall portion 43 on the back side. However, in other embodiments, a material other than iron can be used. For example, it can be made of aluminum or plastic. Further, instead of the U-shaped cross section, a closed cross section of a square may be used as shown in FIG. 7B. That is, it can have the side wall portion 51 surrounding the four sides and the back wall portion 53 on the back side. In this case, a bolt hole 55 communicating with the bolt hole 35 is formed in the side wall portion 51.

Further, as shown in FIG. 7 (C), a half-moon-shaped closed cross section can be used. That is, a dome-shaped side wall portion 57 and a plate-shaped side wall portion 59 surrounding four sides and a back wall portion 61 on the back side can be provided. Also in this case, a bolt hole 55 communicating with the bolt hole 35 is formed in the side wall portion 59. That is, the sectional shape of the joint box member 39 does not matter.

In the above embodiment, the upper and lower steel segments 2 form a staggered configuration in which the steel segment pieces 21 are connected alternately (see FIG. 2).
The piece unit 5 shown in FIGS. 4A and 4B is used. However, in another embodiment, the staggered connection may not be partially performed. ) Can be used.

In the above embodiment, the joint box 40 is filled with a filler in order to reduce the peripheral friction. In other embodiments, the opening of the joint box 40 is made of a steel plate. It may be closed by welding.

Further, in the above embodiment, the structure of the steel segment piece 21 is such that a pair of parallel linear joint plates 25 are welded to both ends of a pair of parallel main beams 23 so that the main beam 23 is welded. In this case, one middle main girder 27 is arranged in parallel with the slab, five longitudinal ribs 29 are arranged in parallel with the joint plate 25, and a skin plate 31 is stretched outside these. In other embodiments, such a structure is not necessarily required. That is, the number of the main main digits 27 is one,
Alternatively, the number may be two or more. Alternatively, it may not be provided at all.

The number of the vertical ribs 29 is one, two, three.
The number may be four, four, or six or more. Or,
It may not be provided at all.

In the above embodiment, the submerged body 1 constituted by the steel segment pieces 21 has a complete circular cross section (FIG. 2). However, in other embodiments, the submerged body 1 does not necessarily have a circular cross section. It may be oval, elliptical, or substantially square. Even in that case,
By improving the dimensional accuracy in the horizontal plane, an accurate oval shape or a substantially square shape can be obtained.

In the above embodiment, the steel segment pieces 21 constitute the steel segment 2 in which six are connected in the circumferential direction. However, in other embodiments, five or less or seven steel segments are used. The above may be configured by being connected.

[0051]

As described above, the first, second, third,
According to the invention of 4, 5, 6, 7, or 8, by the joint box opening on the outer surface of the steel segment piece,
Since the steel segment pieces can be connected from outside, there is no need to attach a scaffold inside. Therefore, the scaffold does not obstruct the excavator such as a hammer grab bucket for excavation. Further, it is possible to avoid the trouble of having to attach and detach the scaffold every time the process is repeated. Also,
According to the fifth or seventh aspect of the present invention, the number of joint boxes can be further reduced, and the labor for manufacturing and constructing the segment pieces can be reduced. In addition, according to the invention of claim 8, by further filling the joint box with a filler, peripheral friction can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an outer surface of a steel segment piece according to an embodiment of the present invention.

FIG. 2 is a perspective view of a submerged body constituted by connecting the steel segment pieces of FIG. 1;

3A and 3B show a lowermost steel segment formed by connecting the steel segment pieces of FIG. 1, wherein FIG. 3A is a plan view and FIG. 3B is a side view.

4 (A), (B) and (C) are perspective views of a piece unit formed by connecting the steel segment pieces of FIG. 1 in advance.

FIG. 5 is a perspective view showing the inside of the steel segment piece of FIG. 1;

FIG. 6 is an enlarged exploded view of a VI section for showing the connecting section of FIG. 2;

FIG. 7 is an enlarged view of a joint box member housed in a VII section in FIG. 6;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Deposited body 2 Steel segment 5 piece unit 6 Blade part 7 Friction cut 21 Steel segment piece 23 Main girder 25 Joint plate 27 Middle main girder 29 Vertical rib 31 Skin plate 33 Backing plate 35 Bolt hole 37 Notch 39 Joint Box member 40 Joint box 41 Side wall member 43 Back wall member 45 Opening 47 Bolt 49 Nut

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Atsushi Ito Kanie-cho, Kaifu-gun, Aichi Prefecture 19th Kanie-Nitta-shi Shimo Market Kato Construction Co., Ltd. (72) Inventor Yoshiyuki Hamada, Kanie-cho, Kaifu-gun, Aichi 19 Kanye Nitta character lower market 1 Kato Construction Co., Ltd.

Claims (8)

[Claims] 1. A steel-made segment formed by connecting steel segment pieces in a circumferential direction and having a cylindrical configuration in which the steel segments are connected in the vertical direction is excavated from the ground inside, and the steel segment is excavated. By applying pressure from above, the steel segment piece used in the construction method that is pressed into the ground from a ring-shaped cutting edge installed along the lower edge of the lowermost steel segment, A steel segment piece having a joint box opening on an outer surface, wherein a joint box used for connection work in a circumferential direction or a vertical direction is open on an outer surface. 2. A skin plate having a substantially rectangular shape, a main girder welded to the upper and lower edges of the square on the inner surface of the skin plate, and a joint plate welded to the left and right edges of the square. And a joint box opening at an edge of a skin plate for use in a connecting operation of connecting adjacent steel segment pieces through the main girder or the joint plate. A steel segment piece with an open box. 3. The joint box includes a cut-out portion formed at an edge of a skin plate and a joint box member housed and connected to the cut-out portion. 3. A steel segment piece having a joint box opening on the outer surface according to 2. 4. The steel segment according to claim 2, wherein at least a part of the joint box is formed by bending a skin plate. piece. 5. The outer surface according to claim 1, wherein the joint box is provided only at a part of a plurality of connection points provided on one steel segment piece. A steel segment piece with a joint box opening in it. 6. A tubular submerged body using the steel segment piece according to claim 1 or 2 and connecting the steel segment piece in a circumferential direction and a vertical direction using a joint box opened on an outer surface. A first step to configure, and a second step of excavating the ground inside the submerged body and applying pressure from above to press the ground into the ground from the blade edge of the lower edge, the first step and the second step A method for constructing a submerged body using a steel segment piece having a joint box opened on the outer surface, wherein the submerged body is constructed underground by repeating the above steps. 7. The first step is a step in which several adjacent steel segment pieces are previously connected from inside to form a piece unit, and the piece unit is suspended by a crane and opened to an outer surface. using,
7. A step of connecting from the outside to another steel segment piece which already constitutes a submerged body, wherein the steel segment piece having a joint box opened on the outer surface according to claim 6 is used. How to construct a sinking body. 8. After the connection using the joint box is made, the joint box is filled with a filler to reduce peripheral friction generated between the joint box and the ground when the submerged body is submerged. A method for constructing a submerged body using a steel segment piece having a joint box opening on the outer surface according to claim 7.