JP4425827B2 - Method for constructing member and constructed member - Google Patents

Description

  The present invention relates to a method for constructing a member using strand rebar and a constructed member.

  Conventionally, a WBR (Whale Bone Roof) method is known as a large section tunnel method. In the WBR construction method, after penetrating the installation guide over the entire length of the tunnel construction zone, the medium diameter steel pipe is installed by performing bending boring with a bending boring device in the circumferential direction of the tunnel from the installation guidance. In this method, tunnels are excavated after an artificial ground arch is created by injecting reinforcing bars and injection material from the steel pipe into the ground around the tunnel (Patent Document 1).

  In addition, a propulsion method is known as a method for burying sewage pipes. The propulsion method is a method in which an existing reinforced concrete box or the like is press-fitted into a natural ground by a propulsion device equipped in a vertical shaft, and is attached while excavating earth and sand at the edge of the blade (Patent Document 2).

Furthermore, an open caisson method is known as a construction method for shafts. The open caisson method is a method of gradually sinking a box while excavating and carrying out the inside of a tubular reinforced concrete box or the like whose upper and lower surfaces are opened from the ground by an excavating machine such as a clam shell (Patent Document 3). ).
JP-A-11-159275 Japanese Patent Publication No.53-6458 JP-A-11-36338

However, in these methods, there is a problem in workability because it is necessary to construct a rebar within a narrow top guide or shaft.
Further, when the size of the box to be embedded becomes large, the box has been hindered in transportation and storage.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a method for constructing a member that can construct a reinforcing bar easily and does not cause a problem in transportation and storage. is there.

According to a first aspect of the present invention for achieving the above-mentioned object, a bar-like member obtained by processing a rod-like member into a circular shape, a polygonal shape or a spiral shape, and an inner side or an outer side of the hoop is arranged and rotated with respect to the hoop. A method for constructing a member using a casing having strands that can be coupled to each other, the casing having a reduced length by spiraling the strand at the rear end of an excavator A step of connecting (a), the excavator is propelled from the underground structure into the ground by a pushing device through a propelling pipe, and the length of the casing is extended by straightening the strand A method for constructing a member comprising the step (b) of disposing in the propelling pipe and the step (c) of filling the propelling pipe with concrete.
The underground structure may be a tunnel.

  2nd invention is the member constructed | assembled using the construction method of the member described in 1st invention.

  According to the present invention, it is possible to easily construct a reinforcing bar, and there is no problem of transportation and storage.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1A and 1B are diagrams showing a reinforcing bar casing 1 used in the first embodiment, in which FIG. 1A is a side view and FIG. 1B is a contraction of the casing 1 in FIG. FIG. In addition, 1st Embodiment is the construction method of the member which used the housing 1 in the WBR construction method.

As shown in FIG. 1A, the housing 1 has a cylindrical shape, and includes a strand 3 that is an axial line and a ring-shaped band 5 that is disposed so as to surround the plurality of strands 3. The band 5 has a circular shape, a polygonal shape, a spiral shape, or the like.
In addition, the strand 3 and the band 5 are connected at a crossing point by a coupling jig (not shown), and the strand 3 is rotatable with respect to the band 5.

  The strand 3 is made of a flexible material that does not cause a problem in strength or the like even if it is bent to the same degree or more as the diameter of the band 5. The strand 3 is made of, for example, a twisted PC fiber, a wire rope, or a combination of fibers such as carbon fiber, glass fiber, and aramid fiber. The band 5 is a reinforcing bar or the like.

When the housing 1 is in the state shown in FIG. 1A, the strand 3 and the reinforcing bar 5 intersect each other substantially vertically, but the strand 3 extends in the direction indicated by the arrow A in FIG. When the wire is bent, the strand 3 rotates, the crossing angle with the band 5 changes, and at the same time the strand 3 becomes spiral, the bar arrangement interval of the band 5 gradually decreases, as shown in FIG. Thus, the length of the casing 1 is shortened.
In this way, by shortening the casing 1, it is possible to construct a reinforcing bar even in a narrow space, and facilitate transportation and storage.

  Next, a method for constructing a member using the casing 1a in the WBR method will be described. 2 and 4 are diagrams showing a procedure for constructing a member using the housing 1a, and FIG. 3 is a cross-sectional view taken along the line CC in FIG. 2 (a).

First, as shown in FIG. 2A, tunnels 7a and 7b are constructed at both ends of a planned site of a natural ground 9 for constructing a large section tunnel.
Next, the gantry 11 is fixed to the tunnel 7a, and the extrusion device 13 having a built-in hydraulic jack or the like is fixed on the gantry 11.
The pusher 13 is equipped with an excavator 15 for excavating the natural ground 9.

That is, when the extrusion device 13 presses the excavator 15, a cutter (not shown) provided at the tip of the excavator 15 excavates the natural ground 9.
The extrusion device 13 is fixed to the gantry 11 at an angle so that the excavator 15 passes the planned boring position 17.
Further, the planned boring position 17 has an arcuate shape and connects the tunnel 7a and the tunnel 7b.

Next, the extruding device 13 presses the excavator 15 toward the planned boring position 17 of the natural ground 9, and the excavator 15 excavates the natural ground 9, while the inside of the planned boring position 17 is shown in FIG. Move in direction B.
At this time, as shown in FIG. 2B, the casing 1 a is connected to the end portion 21 of the excavator 15 in a contracted state, and the casing 1 a extends as the excavator 15 moves.
The structure of the housing 1a is the same as that of the housing 1, and the length when the housing 1a is most extended is substantially equal to the total length of the planned boring position 17.

Next, when the excavator 15 advances a certain distance, the pressing by the extrusion device 13 is once stopped, and the steel pipe 19 is connected to the end 19 of the excavator 15.
At this time, as shown in FIG. 3, the steel pipe 19 is connected so that the housing 1 a is provided in the interior 23.

  When the connection is completed, the extrusion device 13 presses the steel pipe 19 this time, and the excavator 15 connected to the steel pipe 19 moves inside the planned boring position 17 while excavating the natural ground 9 again.

Thereafter, as shown in FIG. 2 (c), each time the excavator 15 advances by a certain distance, a new steel pipe 19 is connected to the steel pipe 19, and the pushing device 13 presses the new steel pipe 19 to proceed with excavation. . At the same time, the housing 1a extends as the excavator 15 moves.
In this manner, by using the expandable / contractible frame 1a using the strand as a reinforcing bar, the reinforcing bar can be easily constructed in the tunnel 7a.

  As shown in FIG. 4A, when the excavator 15 reaches the tunnel 7b, the excavator 15 and the extrusion device 13 are separated from the housing 1a and the steel pipe 19.

  Next, as shown in FIG. 4B, a concrete pump 25 is provided on the gantry 11, and concrete 27 is injected from the concrete pump 25 into the inside 23 of the steel pipe 19. At this time, in order to prevent the concrete 25 from leaking, the steel pipe 19 exposed to the tunnel 7b is provided with a blind cover 29.

When the concrete 27 is hardened, an arcuate member 29, which is a reinforced concrete member having a housing 1a provided therein, is completed.
Note that the steel pipe 19 may be extracted and reused before the concrete 27 is completely cured.

  Thereafter, an arcuate member 29 is formed between the tunnels 7a and 7b at regular intervals to form an artificial ground arch, and a large-section tunnel is formed by excavating between the tunnels 7a and 7b.

  As described above, according to the first embodiment, in the WBR method, the housing 1a is attached to the end 21 of the excavator 15 in a contracted state, and as the excavation progresses, the housing 1a is extended to construct a reinforcing bar. . Therefore, a reinforcing bar can be constructed easily.

  Next, a second embodiment will be described. FIGS. 5 and 7 are diagrams showing the construction procedure of the member in the second embodiment. FIG. 6A is a view taken in the direction of the arrow D in FIG. 5B, and FIG. FIG. 6C is a view in the direction of arrow E in FIG. 6C, and FIG. 6C is a view in the direction of arrow F in FIG.

  2nd Embodiment is the construction method of the member which constructs a box using the frame 1b in a propulsion construction method.

  First, as shown in FIG. 5A, a shaft 33 is constructed on the ground 31, and a portal crane 35 is installed on the ground portion of the shaft 33. The portal crane 35 is provided with a wire 51, and a lifting jig 49 is provided on the wire 51 so as to be movable up and down.

Next, the excavator 39 is attached to the wall surface 37a of the shaft 33, and the extrusion device 41 is attached to the wall surface 37b.
Next, the excavator 39 is pressed by the main push jack 43 of the extrusion device 41, and the pressed excavator 39 excavates the wall surface 37a.

When excavation proceeds for a certain distance, the pressing by the main push jack 43 is temporarily stopped, and the inner mold 45 is connected to the end 47 of the excavator 39.
The inner formwork 45 is an iron cylindrical tube, and is a member that becomes a formwork when a box 59 described later is constructed.

Next, the housing 1b is hung from the hanging jig 49 in a contracted state, and is extended so as to cover the inner mold 45 as shown in FIGS. 5 (b) and 6 (a).
The structure of the casing 1b is the same as that of the casing 1, and the total length of the casing 1b when extended is substantially equal to the total length of the inner mold 45.
One end of the housing 1 b is connected to the end 47 of the excavator 39.

Next, as shown in FIGS. 5 (c) and 6 (b), the outer mold lower half 53 a lifted by the lifting jig 49 is covered with the portal crane 35 so as to cover the periphery of the housing 1 b. Provided.
Similarly, as shown in FIGS. 5 (c) and 6 (c), the outer mold upper half 53 b is provided so as to cover the periphery of the frame 1 b using the portal crane 35.
The outer mold lower half 53a and the outer mold upper half 53b are iron semi-cylindrical tubes, which are members that serve as molds when a box 59 described later is constructed.

Next, as shown in FIG. 7A, the tremy tube 57 is connected to the injection port 55 provided in the outer mold upper half 53b, and the outer mold lower half 53a and the outer mold upper half 53b. Concrete is poured into the space between the inner mold 45 and the inner mold 45. When the concrete is hardened, a cylindrical box 59 as shown in FIG. 7B is constructed.
The outer mold lower half 53a, the outer mold upper half 53b and the inner mold 45 are removed and reused immediately before the concrete is hardened.

  Next, the box 59 is pressed using the main pushing jack 43 of the pushing device 41. As a result, the excavator 39 connected to the box 59 moves in the ground 31 while excavating the ground 31 again.

When the box 59 moves within the ground 31 for a certain distance, the pressing by the main push jack 43 is temporarily stopped, and the box 59 has an inner mold 45, a casing 1b, an outer mold lower half 53a, and an outer mold on the mold 59. The half portion 53b is connected, and concrete is poured into the space between the outer mold lower half 53a, the outer mold upper half 53b, and the inner mold 45 to construct a new box 59.
Note that when the boxes 59 are connected to each other, it is desirable that the internal casings 1b are also connected to each other using a condominium or the like (not shown).

  Thereafter, the boxes 59 are connected and buried one after another in the ground 31 to construct a pipe such as a sewer pipe.

  Thus, according to the second embodiment, in the propulsion method, the space was reduced to the space between the outer mold lower half 53a, the outer mold upper half 53b, and the inner mold 45 provided in the shaft 33. The box 1b is inserted and stretched, and then concrete is injected to construct the box 59. Therefore, a reinforcing bar can be constructed easily, and further, the box 59 need not be transported and stored.

  Next, a third embodiment will be described. FIGS. 8 and 10 are diagrams showing a construction procedure of members in the second embodiment, and FIG. 9A is a view in the direction of the arrow H in FIG. 8C. Moreover, FIG.9 (b) is an I direction arrow directional view of Fig.10 (a).

  The third embodiment is a method for constructing a member that constructs the box 93 using the casings 1c and 1d in the open caisson method.

First, as shown in FIG. 8A, a reaction force anchor 75 is driven around the portion of the ground 63 that constructs the shaft.
Next, a portion for constructing the shaft is excavated to a predetermined depth, and replacement sand is buried therein to construct the mound 65.

Next, the dish plate 67 is placed on the mound 65, and the blade edge 69 that is the tip when the box body 93 sinks is placed on the dish plate 67.
A reinforcing bar 71 is provided at the upper end of the blade 69, and a condominium 73a is provided at the tip of the reinforcing bar 71, which is a connection part to the casings 1c and 1d described later.

Next, as shown in FIG. 8B, a press-fitting girder 75a is provided on the cutting edge 69 and the reaction force anchor 75 using a hanging jig 79, and a jack 81 is provided on the press-fitting girder 75a.
Next, while excavating the ground 63 using an excavator 85 suspended by a crane or the like (not shown), the blade edge 69 is press-fitted in the G direction using the jack 81 and the press-fitting girder 75a.

When the blade edge 69 sinks to a certain depth, the jack 81 and the press-fitting girder 75a are temporarily removed as shown in FIG. 8C, and the outer mold frame 87 and the inner mold frame 89 are constructed on the blade hole 69. The outer mold 87 and the inner mold 89 are molds for pouring concrete to be described later.
As shown in FIG. 9A, the outer mold 87 and the inner mold 89 have cylindrical shapes with different diameters, and an internal space 91 formed by the outer mold 87 and the inner mold 89. Inside, a box 93 to be described later is formed.

Next, as shown in FIG. 8 (d), the housing 1 c in a contracted state is inserted between the outer mold frame 87 and the inner mold frame 89 using the hanging jig 79 while being stretched.
The housing 1 c is composed of the strand 3 and the ring-shaped strip 5 arranged so as to surround the plurality of strands 3, as with the housing 1, and the condominium 73 b for connection is provided at both ends of the strand 3. ing.
This apartment 73b is connected to the apartment 73a of the blade 69.

Similarly, as shown in FIG. 10A, the contracted housing 1d is inserted between the outer mold 87 and the inner mold 89 while being stretched to connect the condominiums.
Here, as shown in FIG. 9B, the housing 1c is provided in a position near the outer mold 87 in the internal space 91, and the housing 1d is provided near the inner mold 89. Yes.
Thus, the intensity | strength of the constructed box 93 can be raised by providing a housing twice.

  Next, concrete is poured into the internal space 91 to construct a box 93 as shown in FIG. 10B, and the outer mold 87 and the inner mold 89 are removed immediately before the concrete is hardened.

Next, as shown in FIG.10 (c), using the hanging jig 79, the press-fitting girder 75a is provided on the box 93 and the reaction force anchor 75, and the jack 81 is provided on the press-fitting girder 75a.
Next, as shown in FIG. 10 (d), the box 93 is press-fitted using the jack 81 and the press-fitting girder 75a while excavating the ground 63 using an excavator 85 suspended by a crane or the like (not shown). Thereafter, the above operation is repeated. In addition, when connecting the boxes 93, it is desirable to connect the housings 1c and the housings 1d using the apartment 73b.

  As described above, according to the third embodiment, in the open caisson method, the contracted bodies 1c and 1d are inserted between the outer mold 87 and the inner mold 89 while being stretched, and then concrete is injected. The box 93 is constructed. Therefore, a reinforcing bar can be constructed easily, and further, transport and storage of the box 93 are not required.

  As mentioned above, although the preferred embodiment of the construction method of the member concerning this invention and the constructed member concerning the attached drawing was described, this invention is not limited to this example. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

The figure which shows the housing 1 The figure which shows the procedure of the construction | assembly of the member using the housing 1a CC sectional drawing of Fig.2 (a) The figure which shows the procedure of the construction | assembly of the member using the housing 1a The figure which shows the construction procedure of the member D direction arrow view of FIG. 5 (b), E direction arrow view of FIG. 5 (c), F direction arrow view of FIG. 7 (a) The figure which shows the construction procedure of the member The figure which shows the construction procedure of the member H direction arrow view of FIG. 8C, I direction arrow view of FIG. The figure which shows the construction procedure of the member

Explanation of symbols

1 ......... Housing 3 ......... Strand 5 ......... Strip 7a ... Tunnel 9 ......... Machiyama 11 ... Base 13 ... Extruder 15 ... Excavator 17 ... Bowling planned position 19 ... Steel pipe 25 …… Concrete pump 29 …… Arch-shaped member 31 …… Ground 33 …… Vertical shaft 35 …… Port crane 37a… Wall 39… Excavator 41 …… Extruding device 43 …… Main push jack 45 …… Inner type Frame 49 …… Hanging jig 53a… Outer mold upper half 65 …… Mound 67 …… Dish plate 69 …… Blade 71 …… Reinforcing bar 73a… Mansion 75 …… Reaction anchor 75a… Press-fit girder 87 …… Outside Formwork 89 …… Inner formwork

Claims (3)

A rod having a strip formed by processing a rod-like member into a circular, polygonal or spiral shape, and a strand arranged inside or outside the strip and rotatably coupled to the strip is used. A method for constructing a member,
A step (a) of connecting the casing in a state in which the length is reduced by spiraling the strand to a rear end portion of an excavator;
A step of propelling the excavator from an underground structure into the ground through a propelling pipe with an extrusion device, and arranging the casing in the propelling pipe while extending the length by straightening the strand. (B) and
Filling the propulsion pipe with concrete (c);
A method for constructing a member, comprising:   The member construction method according to claim 1, wherein the underground structure is a tunnel.   A member constructed by using the member construction method according to claim 1.

Images