JP2911819B2 - Construction method of a box-shaped structure connected with concrete blocks and concrete box-shaped blocks used for the method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a concrete box-shaped block arranged in communication with a plurality of concrete box-shaped blocks, which are integrally connected with a linear tightening member to form a culvert, a common groove, or the like.
The present invention relates to a construction method for constructing a box-shaped structure such as an underpass. In addition, by connecting and integrating a plurality of concrete box-shaped blocks arranged in communication with the entirety of the concrete end plates arranged at both ends thereof by linear tightening materials, containers such as water storage tanks and basements are provided. The present invention relates to a construction method for constructing a box-shaped structure having a shape. Further, the present invention relates to a concrete box-shaped block used in these construction methods.

[0002]

2. Description of the Related Art One example of a conventional method of connecting concrete box-shaped blocks to each other using a linear tightening material is to insert a tightening material into insertion holes formed at four corners of a box-shaped block, and to make a required box. Fix the end of the tightening material in a recess formed on the inner side of the corner of the shaped block, then fill the recess with mortar, close the filling with a template, and after curing the mortar. The template had been removed.

[0003] However, in the case of the conventional connection method, the mortar is filled inside the box-shaped block, so that the mortar often adheres to the periphery of the recess at the time of the filling, and especially the upper two When filling the recessed part of the box, a part of the coating mortar is likely to fall, and there is a problem that the inner surface of the box-shaped block becomes dirty. in addition,
The work of filling the upper concave portion with mortar also has a problem that the workability is extremely poor due to the upward posture. In addition, when constructing a waterway with open ends, or when constructing a box-like structure in which both ends are closed, such as a fire prevention water tank or a basement, a suction pipe inlet hole (indicated by the symbol a in FIG. 1). It is necessary to carry a mortar, a filling tool, and the like into the inside of the box-shaped structure through the opening for forming the stairs and the stairs. In particular, in the case of a fire prevention water tank, the diameter of the suction pipe input hole is about 60 cm, which is cramped by humans, and it has been extremely difficult to transport mortar and the like into the water tank.

[0004] In order to solve such a problem, Japanese Utility Model 8
-6859 discloses a method for interconnecting blocks disclosed in Japanese Patent Application Laid-Open No. 6-5959. The concrete box-shaped block used in this connection method is provided with concave portions on the inner surfaces of the four corners, and two upwardly extending outflow holes are provided on the upper two of them. Then, after fixing the tightening material in the concave portion, the concave portion is closed with a cover plate, and thereafter,
The grout is injected into the recess from one of the flow holes, and the air in the recess is discharged from the other flow hole, and the grout overflows from the other flow hole, thereby confirming the grout filling into the recess. Was.

According to this method, grout can be filled into the recess from the outer surface side of the block. Therefore, as in the case of the above-described connection method in which the mortar is filled in the recess and closed with a template, the grout is filled around the recess. In addition to not contaminating the inside of the box-like structure due to the adhesion of the mortar, there is no difficulty such as having to transport the mortar or the like into the box-like structure through a narrow suction pipe charging hole as in a fire prevention water tank. It can be said that it was improved in terms of workability.

[0006]

However, such a construction method also has the following problems, and there is room for further improvement. This will be specifically described below.

As described above, two communication holes are provided at an interval. Now, when grout is injected from one of the flow holes, since the grout is injected from above, the surface of the injection liquid becomes wavy and the grout easily jumps, and this jumped grout may enter the exhaust flow hole. is there. If such a penetration occurs, the smoothness of the exhaust gas may be impaired, and air bubbles may remain in the grout filling portion.
In particular, when a highly viscous liquid such as mortar is injected, the exhaust passage hole is easily clogged with grout, and a separate air vent hole must be formed on site.
Further, when the grout that has entered the inside of the flow hole overflows out of the block, there is a possibility that this may cause a false recognition that the inside of the recess is filled with the grout, and the filling into the recess may be incomplete. Was. Further, since grout or the like is injected from above into the recessed portion in which the projections including the anchor plate, the fixing device, the cap, and the like for fixing exist, a cavity is easily generated below the projections (the lower side of the fixing portion). For this reason, there is a possibility that corrosion of the fixing portion and reduction of the strength of the filling portion may be caused.

[0008] In order to avoid the above-described reduction in exhaust efficiency and the possibility of clogging of the exhaust holes, it is necessary to visually check the state of grout injection into the recess.
The diameter of the flow hole had to be made as large as possible, but forming the flow hole as large as interrupting the reinforcing bar arranged for reinforcement of the box-shaped block at the concave portion, etc.
It may cause structural weakening of the box-shaped block. Therefore, the diameter of the flow hole is limited, and it is difficult to avoid the above problem.

As described above, when the conventional upper injection method is used, there is a problem that the inside of the recess cannot be filled with grout or the like without leaving air bubbles.

[0010] In addition, when the connection method is used, grout filling must be performed in the concave portion of each box-shaped block, and there has been a problem of poor construction efficiency.

An object of the present invention is to solve the above-mentioned problems and to provide a method of constructing a box-like structure formed by connecting concrete blocks, wherein the blocks can be connected to each other by reliably filling grout into the recess. It is assumed that. It is another object of the present invention to provide a concrete box-shaped block used in the construction method.

[0012]

In order to solve the above-mentioned problems, the present invention employs the following means. That is, one method of constructing a box-like structure by connecting concrete blocks according to the present invention (hereinafter referred to as a construction method) is to form a plurality of concrete box-shaped blocks having open front and rear ends by mutually exchanging their ends. Is a construction method of a box-like structure through a step of arranging in a communicating state and connecting and integrating the whole with a linear tightening member.

[0013] Then, at a plurality of places at predetermined intervals on the peripheral edge of the box-shaped block, the insertion holes of the tightening material penetrate the entire box-shaped block in a state where they are communicated with each other in the arrangement direction. At the same time, a required concave portion of the box-shaped block is provided with a concave portion for connection on the inner surface side and at an intermediate portion in the block length direction, and the insertion hole is opened in the concave portion. An air vent hole extending upward and opening to the outside of the block is communicated with the top of the required concave portion, and the upper end of the air vent hole can be closed by a plug.

[0014] Further, after inserting the tightening material into the communicating insertion hole, tightening the tightening material and fixing its end to the recess, the opening of the recess is closed with a cover plate, Thereafter, grout is injected from one end side of the communicating insertion hole, and in the required concave portion, grout flows into the concave fitting portion from the lower side of the insertion hole, and grout flows into the concave portion. Then, the air is evacuated from the air vent, and after the inflow grout flows out of the air vent, the air vent is sealed with the plug.

In addition to the construction method according to the present invention, a plurality of concrete box-shaped blocks having open front and rear ends are arranged so that their ends are communicated with each other, and both ends are closed. This is a method of constructing a box-shaped structure through a process of arranging an end face plate and connecting and integrating the whole with a linear tightening member.

[0016] At a plurality of places at a required interval on the peripheral portion of the end plate and the box-shaped block, insertion holes for the tightening material are arranged in the entire end plate and the box-shaped block. In the required shape of the box-shaped block, a connection recess is provided on the inner surface side and at an intermediate portion in the block length direction, and the recess is provided in the recess. The insertion hole is opened, and an air vent hole extending upward and opening to the outside of the block is communicated with the top of the required concave portion, and the upper end of the air vent hole can be closed by a plug. Become.

Further, after inserting the tightening material into the communicating insertion hole, tightening the tightening material and fixing the end to the recess, the opening of the recess is closed with a cover plate, Thereafter, grout is injected from one end side (one end face plate side) of the communicating insertion hole, and in the required concave portion, grout flows into the concave fitting portion from below the insertion hole. The air is evacuated from the air vent hole with the inflow of grout into the part, and the air vent hole is sealed with the plug after the inflow grout flows out of the air vent hole.

In a more preferred embodiment of the construction method according to the present invention, a plurality of concrete box-shaped blocks having open front and rear ends are arranged so that their ends communicate with each other, and both ends are closed. This is a method of constructing a box-shaped structure through a process in which a concrete end face plate is placed in a box, and the whole is connected and integrated with a linear tightening member.

At the four corners of the end face plate and the box-shaped block, insertion holes for the tightening members are penetrated so as to communicate with the entire box-shaped block arranged in the direction in which the box-shaped block is arranged. A required one of the shaped blocks is provided with a connecting recess on the inner surface side of the four corners and at an intermediate portion in the block length direction, and the insertion hole is opened in the recess, The upper two of the four corner recesses open downward (open diagonally downward or directly below),
An air vent hole that extends upward and opens to the outside of the block communicates with the top, and the upper end of the air vent hole can be closed by a plug.

Further, the tightening member is inserted into the communicating hole, and the tightening member is tightened to fix an end of the tightening member to the concave portion. Then, the opening of the concave portion is closed with a cover plate. Thereafter, grout is injected from one end side (one end face plate side) of the communicating insertion hole, and in the two upper concave portions, the grout flows into the concave fitting portion from below the insertion hole. The grout is evacuated from the air vent along with the inflow of grout into the recess, and after the inflow grout flows out of the air vent, the air vent is sealed with the plug.

As the box-shaped block used in the above-mentioned construction method and provided with a concave portion with an air vent hole, the following structure is preferably used. In the box-shaped block, a concave portion and an air vent hole are formed by a mold buried in concrete at the time of forming the block, and the mold has a cylindrical body standing on the top of a hollow box-like body that opens downward. The lower end of the cylindrical body is communicated with the inside of the box-shaped body, and the upper end is opened outside the block.

In each of the above construction methods, a support plate having the following configuration may be used for fixing the tightening material. This support plate is formed by connecting a long hole for grout outflow to a through hole through which a linear tightening member is inserted. In use, the support plate is arranged so that the end portion of the tightening member projecting into the recessed portion is inserted into the through hole and the elongated hole is directed downward, and the end portion of the tightening member is moved in this manner. The fixing is performed in the recessed portion via the support plate disposed, and in this fixed state, the insertion hole of the box-shaped block communicates with the recessed portion by the elongated hole.

In each of the above construction methods, it is preferable to use a plug formed as a bolt that can be screwed into a female screw portion provided on the upper inner surface of the air vent hole. The screw shaft of the bolt of the plug is provided with a ventilation hole extending along the axis thereof and having a lower end opening at the lower end of the screw shaft and an upper end opening at the peripheral surface of the screw shaft to loosen the bolt. In the state, the opening on the peripheral surface of the screw shaft is exposed outside the block, and the air vent hole opens outside the block through this ventilation hole,
When the bolt is tightened, the opening on the peripheral surface of the screw shaft is closed by the inner peripheral surface of the air vent hole, and the air vent hole is sealed with the bolt.

When the plug is formed as a bolt, a groove having a required width or a flat surface having a required width is provided on the peripheral surface of the screw shaft so as to continue from an intermediate portion toward the lower end of the screw shaft.
When the bolt is loosened, the ventilation hole formed between the groove or the flat surface and the inner peripheral surface of the air vent hole opens outside the block, while when the bolt is tightened, the air vent hole is sealed with the bolt. It can also be configured to be performed.

As the box-shaped block used in the above-mentioned construction method and provided with a concave portion having an air vent hole, it is preferable to use the following structure. The box-shaped block is a concrete box-shaped block whose front and rear ends are open, and has an insertion hole through which a linear tightening material can be inserted in the block length direction at four corners on the upper, lower, left and right sides. A concave portion for connection is provided on the inner surface side of the four corners and at an intermediate portion in the block length direction, and the two concave portions located on the upper side are opened downward (opened diagonally downward or directly below), An air vent hole extending upward and opening outside the block is communicated with the top, and the concave portion and the air vent hole are formed by a mold buried in concrete at the time of block molding, and the mold is A cylindrical body is erected at the top of the box-shaped body that is opened downward, the lower end of the cylindrical body is communicated with the inside of the box-shaped body, and the upper end is opened outside the block. The upper end of the can be closed by a stopper It is intended to.

Another embodiment of the box-shaped block according to the present invention is a concrete box-shaped block whose front and rear ends are open, and linear tightening is performed at a plurality of places on the peripheral edge thereof at a required interval. An insertion hole through which a material can be inserted is penetrated in the block length direction, and a concave portion for connection is provided on the inner surface side of the block and at an intermediate portion in the block length direction, and the insertion hole is formed in the concave portion. An air vent hole extending upward and opening to the outside of the block communicates with the top of the required concave portion, and the upper end of the air vent hole can be closed by a plug. And the plug is
It is formed as a bolt that can be screwed into a female screw portion provided on the upper inner surface of the air vent hole. The screw shaft of the bolt extends along the axis thereof, the lower end opens at the lower end of the screw shaft, and the upper end has the upper end. There is a vent hole that opens on the peripheral surface of the screw shaft, and when the bolt is loosened, the opening on the peripheral surface of the screw shaft is exposed outside the block, and the air vent hole opens outside the block through this vent hole. When the bolt is tightened, the opening on the peripheral surface of the screw shaft is closed by the inner peripheral surface of the air vent hole, and the air vent hole is sealed with the bolt.

Another embodiment of the box-shaped block according to the present invention is a concrete box-shaped block whose front and rear ends are opened, and through which a linear tightening material can be inserted at the four corners at the top, bottom, left and right. A hole is provided in the block length direction, and a connection recess is provided on the inner surface side of each of the four corners and at an intermediate portion in the block length direction.
The individual recesses open downward (open diagonally downward or directly below),
An air vent hole extending upward and opening outside the block is communicated with the top, and the concave portion and the air vent hole are formed by a mold buried in concrete at the time of block molding, and the mold is A cylindrical body is erected at the top of the box-shaped body that opens downward, the lower end of the cylindrical body is communicated with the inside of the box-shaped body, and the upper end is opened outside the block,
The upper end of the cylindrical body can be closed by a stopper. The plug is formed as a bolt that can be screwed into a female screw portion provided on the upper inner surface of the air vent hole, and the screw shaft of the bolt extends along its axis and the lower end is the lower end of the screw shaft. There is a ventilation hole that opens at the top and opens at the upper end on the peripheral surface of the screw shaft.When the bolt is loosened, the opening on the peripheral surface of the screw shaft is exposed outside the block, and the air vent hole passes through this ventilation hole. While being opened to the outside of the block, when the bolt is tightened, the opening on the peripheral surface of the screw shaft is closed by the inner peripheral surface of the air vent hole, and the air vent hole is sealed with bolts. is there.

Another aspect of the box-shaped block according to the present invention is a concrete box-shaped block whose front and rear ends are opened, and through which a linear tightening member can be inserted at the four corners at the upper, lower, left and right sides. A hole is provided in the block length direction, and a connection recess is provided on the inner surface side of each of the four corners and at an intermediate portion in the block length direction.
The individual recesses open downward (open diagonally downward or directly below),
An air vent hole extending upward and opening outside the block is communicated with the top, and the concave portion and the air vent hole are formed by a mold buried in concrete at the time of block molding, and the mold is A cylindrical body is erected at the top of the box-shaped body that opens downward, the lower end of the cylindrical body is communicated with the inside of the box-shaped body, and the upper end is opened outside the block,
The upper end of the cylindrical body can be closed by a stopper. The plug is formed as a bolt that can be screwed into a female screw portion provided on the upper inner surface of the air vent hole, and the peripheral surface of the screw shaft of the bolt extends from an intermediate portion toward the lower end of the screw shaft. When the bolts are loosened, a groove formed between the groove or the flat surface and the inner peripheral surface of the air vent hole is opened to the outside of the block. On the other hand, when the bolt is tightened, the air vent hole is sealed with the bolt.

[0029]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a case in which the construction method according to the present invention is applied to the construction of a fire prevention water tank 1, in which a plurality of concrete box-shaped blocks 2 each having a rectangular cross-section with open front and rear ends are provided. In addition, the end portions are arranged so as to communicate with each other, and concrete end plates 3 and 3 are arranged so as to close both ends thereof, and the whole is connected and integrated using a linear tightening member 5. .

The box-shaped block 2 has insertion holes 6 for penetrating the tightening members 5 at four corners.
As shown in FIGS. 2 and 3, the box-shaped block 2a located in the middle is provided with a recess 7 for connection, which is located at the center of the entering corner and opens in a rectangular shape. 6
The opening 7 is opened at the central portion of both end surfaces 8 in the longitudinal direction of the concave portion 7.

In the present embodiment, the recess 7 is
As shown in FIGS. 4 and 5, a steel box-shaped body 1 having an opening 9 downward.
0 is formed by being embedded at the time of block molding, and a nut 11 serving as an insert is fixed to an outer surface of a central portion of each side of an opening end periphery. A fitting concave portion 13 for fitting a rectangular plate-like lid plate 12 (FIG. 5) is formed in a peripheral portion of the concave portion 7 formed by embedding the box-shaped body 10. The cover plate 12 fitted into the fitting recess 13 closes the recessed portion 7 when a fixing bolt 16 inserted through a bolt hole 15 drilled in the peripheral edge thereof is screwed into the nut 11 and tightened. I do.

Then, the two concave portions 7 located on the lower side
a, 7a, as shown in FIG.
It is provided 5 degrees downward. On the other hand, the two concave portions 7b, 7b located on the upper side
The air vent hole 19 that extends upward and opens to the outside of the block is communicated with a horizontal surface portion 17 at the top of the concave portion 7b. This air vent hole 1
9 is a through hole 21 formed in the horizontal surface portion 17 formed by the box-shaped body 10 in the present embodiment.
Are formed, for example, by vertically standing a resin cylinder 22.

As shown in FIGS. 5 and 6, the upper end of the cylindrical body 22 is open at the bottom surface 25 of the concave portion 23 provided on the outer surface of the block. ~ 6
As shown in FIG. 5, a female screw portion 27 is provided which enables the plug 26 having a bolt 26a to be screwed therein. As shown in FIGS. 6 and 7, the screw shaft 29 of the bolt 26 a
It extends along its axis and has a lower end with an opening 3 at the lower end of the screw shaft.
An L-shaped ventilation hole 32 is provided which has an opening 31 at the peripheral surface of the center portion in the length direction of the screw shaft.

Then, with the bolt 26a loosened,
As shown in FIG. 6, an opening 31 in the peripheral surface of the screw shaft 29 is provided.
Is exposed outside the block, and the air vent hole 19 is opened through the ventilation hole 32 to the outside of the block. On the other hand, when the plug 26 is tightened, as shown in FIG. 5, the opening 31 on the peripheral surface of the screw shaft is closed by the inner peripheral surface 33 of the air vent hole, and the air vent hole 19 is closed. In this state, the recess 23
The bolt head 35 fits in the head.

The end plate 3 has a rectangular plate shape, and its four corners are communicated with insertion holes 6 provided at the four corners of the box-shaped block 2 so that the tightening members 5 can be inserted therethrough. A hole 6 is provided, and a coupling recess 37 is formed in the outer end surface of the hole 6 with the insertion hole 6 positioned at the center of the bottom. As shown in FIG. 8, the connection recess 37 can be closed by a cover plate 39, and the peripheral edge thereof is fixed to the end face plate 3 by fixing bolts 40. In addition, one cover plate 39a is provided with an inlet 41a into which the grout injection unit 41 can be inserted, and the other cover plate 39b is provided with an exhaust hole 42a that can be sealed with a screw plug 42. . Further, as the linear tightening member 5, a steel rod or a stranded wire of steel can be used.

The box-shaped block 2 and the end plate 3
In order to construct the fire prevention water tank 1 shown in FIG. 1 by using the above, a plurality of the box-shaped blocks 2 are arranged on the foundation concrete 43 such that their ends communicate with each other. At that time, a block provided with the concave portion 7 is used as the box-shaped block 2 located at the center. After arranging the end plates 3 and 3 at both ends of the box-shaped block assembly thus arranged in a communicating state,
The whole is connected and integrated using the above-mentioned stranded wire.

The connection and integration are performed in two stages. First, the tightening member 5 as a stranded wire is inserted into the insertion holes 6, 6, and 6 of the one end face plate 3a and the three box-shaped blocks 2c, 2b, 2a connected thereto, as shown in FIGS. To
An end portion 45 of the tightening member 5 protruding into the concave portion 7 and a portion 46 of the connecting concave side are respectively provided with support plates 4.
After the grip 49 has been fitted through the end plate 7, the tightening member 5 is tightened on the end face plate side, and in this state, the outer end portion is fixed to the end face plate 3 by the grip 49.

As shown in FIG. 1, the end plate 3 and the three box-shaped blocks 2c, 2b, 2a are tightly connected and integrated by the pulling of the blocks caused by the tension of the tightening member 5, as shown in FIG. . As shown in FIG. 10, the support plate 47a (FIG. 9) disposed on the right side of the upper concave portion extends through the through-hole 50 through which the tightening member 5 can be inserted, and extends in the outer peripheral direction, and A long hole 51 communicating with the insertion hole 6
The support plate 47a is fitted in the end portion 45 with the elongated hole 51 hanging down. On the other hand, the connecting recess 37
As shown in FIG. 8, a support plate 47 disposed therein is provided with a communication hole 53 that allows the connection recess 37 to communicate with the insertion hole 6.

Thereafter, the tightening member 5 is also inserted into the other end face plate 3b and the box-shaped blocks 2e, 2d, 2a connected thereto, and the tightening member 5 is tensioned in the same manner as described above. In the same manner as described above, the fixing is performed in the concave portion 7 and the connecting concave portion 37 of the end face plate 3b, and by pulling the block due to the tension of the tightening member 5, as shown in FIG. Blocks 2e, 2d, 2
a is connected and integrated in a close state.

Thereafter, the bolt 26a as the plug 26 is
As shown in FIG. 6, the upper end opening 31 of the ventilation hole 32 is loosened so as to be exposed to the outside of the block, and the concave portion 7 and the coupling concave portions 37 of the both end face plates 3 are respectively formed as follows.
It is closed and bolted by a cover plate 12 and a cover plate 39 as a steel plate, a synthetic resin plate or the like. Thereafter, when grout is injected from the injection port 41a provided in the one end face plate 3a, the grout flows into the insertion hole 6 from the communication hole 53 of the support plate 47 as shown by an arrow in FIG. The recess 7
Flows into.

As shown in FIGS. 8 and 9, the inflow into the recessed portion 7 is caused by the fact that the long hole 51 of the keyhole-shaped through hole 52 is disposed in a hanging state. This is performed below the protrusion 55 that forms the fixing portion, and accordingly, the concave portion 7 is formed.
The air inside is sequentially discharged from the ventilation holes 32 of the bolts (plugs) 26a. The grout liquid level 56 (FIG. 5) rises quietly, unlike the conventional method in which grout flows in from the top through the flow holes. Then, it was confirmed that the inside of the recess 7 was filled with grout by the fact that the grout flowed out from the upper end of the ventilation hole 32,
As shown in FIG. 5, the upper end opening 31 of the ventilation hole 32 is closed by the inner peripheral surface 33 of the air vent hole by tightening the bolt (plug) 26a.

When the air vent hole 19 is sealed in this way, the pressure of the grout in the recessed portion 7 increases, and the grout injected thereafter flows into the left support plate 4 shown in FIG.
7b through the long hole 51, the insertion hole 6 of the next box-shaped block 2
Into the other end plate 3b as shown by the arrow in FIG.
Flows into the connecting concave portion 37 provided in the above. Accordingly, the air in the connecting recess 37 is sequentially discharged from the exhaust port 42a of the cover plate, and the grout overflows from the exhaust port 42a to stop grout injection. Thereafter, the exhaust port 42a is sealed with the screw stopper 42. Thereby, the insertion hole 6 and the concave portion 7 in the communicating state and both the connecting concave portions 3 are formed.
A state in which grout is filled in the entirety of 7, 37 can be achieved.

Then, the two concave portions 7,
7, one end face plate 3 is also provided in the through holes 6 and 6 in the communicating state.
The grout is injected from the injection port of the cover plate according to (a), and the grout flows out of the exhaust port of the cover plate according to the other end face plate 3b. Is filled with grout. Through the above steps, the entire box-shaped block 2 and the end face plates 3 are connected and integrated.

In the present embodiment, since the bolt having the ventilation hole 32 bent in an L shape is used as the plug 26, the head of the bolt functions as an eave, so that even in the case of work in rainy weather, for example, In addition, it is possible to prevent rain from entering the air vent hole 19 from the vent hole 32 as much as possible, and to form a high-strength filling portion.

When the grout thus filled hardens, the hardened material in the insertion hole fills the gap around the tightening member and integrates the tightening member with the block. Accordingly, it is possible to reliably prevent the joining portion of the block from being shifted by receiving an external force, and to effectively function the tightening member as a shear reinforcing member. Further, the grout hardened material in the insertion hole 6, the concave portion 7, and the connecting concave portion 37 covers the tightening member 5, the support plate 47, and the grip 49 to exhibit the rust prevention function. It can be integrated with the concrete block to reinforce this concave portion and the connecting concave portion.

[Other Embodiments] 1) FIG. 11 shows another embodiment in which the end portion of the linear tightening member 5 is fixed to the recessed portion 7, and the end portion 59 has a screw as the tightening member. Using a steel rod formed as a shaft, a support plate 47 having an insertion hole 61 through which the recessed portion 7 and the insertion hole 6 are inserted is fitted into the end portion 59, and a nut 60 is screwed and tightened. .

2) In the present invention, the grout is caused to flow into the concave portion from the lower side of the insertion hole, but the structure is such that the support having the keyhole-shaped elongated hole 51 shown in the above embodiment is provided. In addition to using a plate, as shown in FIG. 11, a support plate in which a communication hole 61 for communicating the recessed portion 7 and the insertion hole 6 is provided in a downward direction may be used. Alternatively, as shown in FIG.
A communication groove 62 for communicating the recess 7 with the insertion hole 6 may be provided on the inner surface of the recess 7 forming a peripheral portion of the recess 7.

3) The box-shaped structure according to the present invention refers to all box-shaped structures such as culverts, common ditches, and underpasses whose both ends are not closed by end plates. It refers to general water storage tanks and basement rooms including fire-resistant water tanks in the form of containers having space.

4) When the plug 26 is formed with a bolt, a groove having a required width continuous from an intermediate portion to a lower end of the screw shaft is provided on a peripheral surface of the screw shaft 29 of the bolt as shown in FIG. In some cases, a flat surface 65 having a required width may be provided as shown in FIG. In this case, when the bolt is loosened, the air hole 66 is formed between the groove 63 or the flat surface 65 and the inner peripheral surface 33 of the air vent hole 19, whereas when the bolt is tightened, the air vent hole 19 is formed. Is sealed with the bolt.

5) The plug for sealing the air vent hole may be a press-fit type in addition to the screw type.

6) The air vent hole may extend upward in a slightly oblique state.

7) In the method of the present invention, when the length of the box-shaped structure to be constructed in the extension direction is large, a plurality of box-shaped blocks having recesses are incorporated at required intervals.

8) FIG. 15 shows another embodiment of the box-shaped block 2, in which the upper portion is formed in an arch shape, and linear tightening members are provided at the lower end, the middle and the upper and lower right and left sides. An insertion hole 6 that can be inserted therethrough is provided, and a concave portion 7 for connection is provided on the inner surface side of the block and at an intermediate portion in the block length direction, and a top portion of each concave portion 7 extends upward. An air vent hole 19 opening outside the block is communicated, and the upper end of the air vent hole 19 can be closed by a plug.

9) In the above embodiment, grout may be filled directly from the communication hole 53 of the support plate 47 disposed in the connection recess 37.

10) The box-shaped block according to the present invention may be formed by connecting upper and lower divided blocks.

11) When the box-like structure is a basement, the end plate may be configured to have a window opening communicating with the empty moat.

[0057]

The present invention has the following excellent effects. The present invention employs a configuration in which after the concrete blocks are connected to each other with the tightening material, the concave portion is closed with a cover plate, and grout is filled from one end of the insertion hole communicating through the concave portion. Therefore, unlike the conventional construction method in which the mortar is filled in the recess after the blocks are connected to each other and closed with a cover plate, it is not necessary to transport the mortar or the like into the box-shaped structure, and the connection construction can be streamlined, The conventional problem that the surrounding area is contaminated with mortar when the concave portion is filled with mortar can be solved.

According to the present invention, grout is filled into the required concave portion from below the insertion hole. Therefore, the entire concave portion including the lower side of the fixing portion of the tightening material can be filled with the grout densely, and a filled portion with stable strength can be formed. Also this grout filling,
Since the filling is not performed from above as in the related art, the filling can be performed while the liquid surface is gently raised, and the air in the recess can be smoothly exhausted from the air vent hole provided at the top of the recess. As a result, it is possible to solve the problem that the grout that has jumped into the air vent hole makes it difficult to exhaust the air or that the grout that has entered, as in the related art, is mistaken for filling the recess.

According to the present invention, since grout is injected from one end of the communicating insertion hole, unlike the conventional case, there is no need to provide two flow holes for filling and exhausting grout or the like. It is only necessary to provide an air vent hole. In addition, as described above, the air can be smoothly exhausted from the air vent hole, and it is not necessary to visually check the filling state as in the related art. Therefore, the air vent hole may be formed to have a small diameter. Therefore, it is possible to solve the conventional problem in which the provision of the two large-diameter exhaust holes may cause an obstacle in the arrangement of the reinforcing reinforcing bar of the box-shaped block. Further, according to the present invention, grout can be simultaneously filled into the whole of the communicating insertion hole and the recessed portion, and it is not necessary to fill each recessed portion as in Japanese Utility Model Publication No. 8-6859. Can be performed efficiently.

When a bolt having a vent hole or a groove or a flat surface is used as the plug, the head of the bolt serves as an eave even in construction in rainy weather. The possibility of intrusion can be avoided as much as possible, and a high-quality grout filling portion can be formed. Further, since the air vent hole can be closed by screwing the bolt, the air vent hole can be easily closed against the pressure of the filling grout.

When the recessed portion on the upper side of the box-shaped block is formed by using an embedded mold in which a cylindrical body is erected on the top of the box-shaped body, the position of the air vent hole with respect to the recessed portion is determined by itself. There is an advantage that the concave portion having the air vent hole can be formed accurately and easily.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a fire prevention water tank constructed by applying the present invention.

FIG. 2 is a perspective view showing a box-shaped block having a concave portion to which an air vent hole is communicated.

FIG. 3 is a sectional view of the same.

FIG. 4 is a perspective view showing an embedded mold forming a concave portion and an air vent hole.

FIG. 5 is a cross-sectional view illustrating a concave portion and an air vent hole.

FIG. 6 is a cross-sectional view illustrating a means for closing an air vent hole.

FIG. 7 is a perspective view showing a plug made of a bolt.

FIG. 8 is a cross-sectional view illustrating a fixing state of the tightening material on the end face plate.

FIG. 9 is a cross-sectional view illustrating a fixing state of a tightening material in a concave portion.

FIG. 10 is a perspective view illustrating a method of using a support plate provided with holes for grout outflow.

FIG. 11 is a cross-sectional view illustrating another fixing state of the tightening member in the concave portion.

FIG. 12 is a perspective view for explaining another means for causing grout to flow into a concave portion.

FIG. 13 is a perspective view showing another example of a plug made of a bolt.

FIG. 14 is a perspective view showing another example of a plug made of a bolt.

FIG. 15 is a sectional view showing another embodiment of the box-shaped block.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fire prevention water tank 2 Box-shaped block 3 End plate 5 Tightening material 6 Insertion hole 7 Depression 9 Opening 10 Box-shaped body 12 Cover plate 19 Air vent hole 22 Cylindrical body 26 Plug body 30 Opening 31 Opening 32 Vent hole 33 Inner peripheral surface 37 Connection Recess 39 cover plate 47 support plate 50 through hole 51 long hole

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E03F 3/04

Claims (11)

(57) [Claims] 1. A box-shaped block comprising a step of arranging a plurality of concrete box-shaped blocks having open front and rear ends so that their ends communicate with each other, and connecting and integrating the whole with a linear tightening member. A method for constructing a structure, wherein, at a plurality of places at a required interval on a peripheral portion of the box-shaped block, the insertion holes of the tightening material communicate with the entire box-shaped block arranged in the arrangement direction. At the same time, a required recess of the box-shaped block is provided with a connecting recess on the inner surface side and at an intermediate portion in the block length direction, and the insertion hole is formed in the recess. An air vent hole which extends upward and opens to the outside of the block is communicated with the top of the required concave portion, and the upper end of the air vent hole is made closable by a plug. Into the inserted hole After inserting and tightening this end to fix the end to the recess, the opening of the recess is closed with a cover plate, and then grout is injected from one end of the communicating insertion hole. In the required concave portion, grout is allowed to flow into the concave fitting portion from the lower side of the insertion hole, and the grout is exhausted from the air vent hole with the inflow of grout into the concave portion, and the inflow grout is filled with the air vent hole. A method for constructing a box-shaped structure, wherein the air vent hole is sealed with the stopper after flowing out of the container. 2. A concrete box-shaped block having a plurality of concrete box-shaped blocks whose front and rear ends are opened, and a concrete end face plate is arranged so as to close both ends thereof. A method of constructing a box-shaped structure through a step of connecting and integrating the entirety thereof with the tightening material, wherein the end material and the peripheral portion of the box-shaped block are provided at a plurality of places at a required interval. Insertion holes are formed through the end plate and the entire box-shaped block arranged so as to communicate with each other in the direction in which they are arranged. A concave portion for connection is provided at an intermediate portion in the vertical direction, the insertion hole is opened in the concave portion, and an air vent hole extending upward and opening outside the block is provided at the top of the required concave portion. Can communicate The upper end of the air vent hole can be closed by a plug, and the tightening member is inserted into the communicating insertion hole, and the end portion is fixed in the recessed portion in a tensioned state. The opening of the concave portion is closed with a cover plate, and thereafter grout is injected from one end side (one end plate side) of the communicating insertion hole, and in the required concave portion, a recess is formed from below the insertion hole. The grout is allowed to flow into the fitting portion, and the grout is exhausted from the air vent hole as the grout flows into the concave portion, and the air vent hole is sealed with the plug after the inflow grout flows out from the air vent hole. Construction method of box-shaped structure characterized by the following. 3. A concrete box-shaped block having front and rear ends open, a plurality of concrete box-shaped blocks arranged so that their ends communicate with each other, and a concrete end face plate arranged so as to close both ends thereof. A box-shaped structure construction method through a step of connecting and integrating the whole with the tightening material, wherein at the four corners of the end face plate and the box-shaped block, the insertion hole of the tightening material is arranged, The entire block is penetrated so as to communicate with the arrangement direction, and a required portion of the box-shaped block is provided with a connecting recess at an inner surface side of the four corners and at an intermediate portion in the block length direction. The insertion hole is opened in the concave portion, and the upper two of the concave portions at the four corners are opened downward, and the top portion is extended upward and opened to the outside of the block. Air vent holes communicate with each other The upper end of the air vent hole can be closed by a plug, and the tightening member is inserted into the communicating insertion hole, and the end portion is fixed in the recessed portion in a tensioned state. The opening of the recess is closed with a cover plate, and then grout is injected from one end side (one end face plate side) of the communicating insertion hole. The grout is allowed to flow into the concave fitting portion from the side, and the grout is evacuated from the air vent hole as the grout flows into the concave portion, and after the inflow grout flows out of the air vent hole, the air vent hole is sealed with the plug. A method for constructing a box-shaped structure, characterized by stopping. 4. The concave portion and the air vent hole are formed by a mold buried in concrete at the time of block molding, and the mold erected a cylindrical body at the top of a hollow box-like body that opens downward. The box-shaped member according to any one of claims 1 to 3, wherein a lower end of the cylindrical body is communicated with the inside of the box-shaped body, and an upper end thereof is opened outside the block. Construction method of structure. 5. A support plate in which a long hole for grout outflow is continuously connected to a through hole through which a linear tightening member is inserted,
The support plate is disposed so that an end portion of the tightening member protruding into the recessed portion is inserted into the through hole and the elongated hole faces downward, and the end portion of the tightening member is connected to the support plate thus arranged. 5. The fixing device according to any one of claims 1 to 4, wherein the fixing member is fixed to the concave portion through the hole, and in the fixing state, the long hole communicates the insertion hole of the box-shaped block with the concave portion. Construction method of box-shaped structure. 6. The plug is formed as a bolt that can be screwed into a female screw portion provided on the upper inner surface of the air vent hole, and the screw shaft of the bolt extends along its axis and has a lower end with a screw. There is a vent hole that opens at the lower end of the shaft and the upper end opens at the peripheral surface of the screw shaft.When the bolt is loosened, the opening at the peripheral surface of the screw shaft is exposed outside the block, and the air vent hole is While opening out of the block through the ventilation hole,
6. The bolt according to claim 1, wherein the opening in the peripheral surface of the screw shaft is closed by the inner peripheral surface of the air vent hole, and the air vent hole is sealed with the bolt. The construction method of a box-shaped structure according to [1]. 7. The plug is formed as a bolt which can be screwed into a female screw portion provided on the upper inner surface of the air vent hole, and the peripheral surface of the screw shaft of the bolt is provided with a screw shaft from an intermediate portion thereof. When a groove having a required width or a flat surface having a required width continuous to the lower end is provided, and the bolt is loosened, a ventilation hole formed between the groove or the flat surface and the inner peripheral surface of the air vent hole is provided outside the block. The method for constructing a box-shaped structure according to any one of claims 1 to 5, wherein the air vent hole is sealed with the bolt while the bolt is tightened while being opened. 8. A concrete box-shaped block whose front and rear ends are open, and insertion holes through which a linear tightening material can be inserted are penetrated in the length direction of the block at four corners of upper, lower, left and right sides. A concave portion for connection is provided on the inner surface side of the four corners and at an intermediate portion in the block length direction. The two concave portions located on the upper side are opened downward, and the top portion is extended upward. An air vent hole that opens to the outside of the block is communicated, and the recess and the air vent hole are formed by a mold buried in concrete at the time of block molding, and the mold is a box-like body that opens downward. A cylindrical body is erected on the top, the lower end of the cylindrical body is communicated with the inside of the box-shaped body, the upper end is opened outside the block, and the upper end of the cylindrical body can be closed by a stopper. For the construction of box-shaped structures Concrete box block. 9. A concrete box having open front and rear ends.
A block that has a required interval
In several places, there are insertion holes through which linear tightening materials can be inserted.
It is penetrated in the block length direction and the inside of the block
And a concave part for connection at the middle part in the block length direction
Is provided, the insertion hole is opened in the concave portion,
In addition, the top of the required concave portion extends upward and
An air vent hole is communicated with the air vent hole.
The upper end of the plug can be closed by a plug, and the plug is formed as a bolt that can be screwed into a female screw portion provided on the upper inner surface of the air vent hole. A ventilation hole extending along the axis and having a lower end opening at the lower end of the screw shaft and an upper end opening at the peripheral surface of the screw shaft is provided. When the bolt is loosened, the opening at the peripheral surface of the screw shaft is blocked. While exposed to the outside and the air vent hole is opened to the outside of the block through this vent hole, when the bolt is tightened, the opening on the peripheral surface of the screw shaft is closed by the inner peripheral surface of the air vent hole, and the air vent hole is bolted. A concrete box-shaped block used for a construction method of a box-shaped structure, which is in a sealed state. 10. The plug body is formed as a bolt that can be screwed into a female screw portion provided on the upper inner surface of the air vent hole.
The screw shaft of the bolt is provided with a ventilation hole extending along the axis thereof and having a lower end opening at the lower end of the screw shaft and an upper end opening at the peripheral surface of the screw shaft. The opening on the peripheral surface of the screw shaft is exposed to the outside of the block, and the air vent hole is opened to the outside of the block through this ventilation hole, while, when the bolt is tightened, the opening on the peripheral surface of the screw shaft is the inner peripheral surface of the air vent hole. 9. The concrete box-shaped block used in the method for constructing a box-shaped structure according to claim 8, wherein the block is closed and the air vent hole is sealed with a bolt. 11. The plug body is formed as a bolt that can be screwed into a female thread portion provided on the upper inner surface of the air vent hole,
On the peripheral surface of the screw shaft of the bolt, a groove having a required width or a flat surface having a required width is provided continuously from an intermediate portion toward the lower end of the screw shaft, and when the bolt is loosened, the groove or the flat surface is formed. while the vent hole formed between the inner circumferential surface of the air vent hole opens out block, in a state where tightening bolts, claims, characterized characterized in that the air vent hole is sealed by a bolt 8 A concrete box-shaped block used in the construction method of the box-shaped structure described in the above .