JP2015200069A - Connection method of precast block and prestress tank using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To connect adjacent precast blocks in a close contat state.SOLUTION: Connection projection parts 4 and 7 of projecting reinforcements 2 and 2' are provided in one of parallel two sides of a precast block 1 having the reinforcements 2 and 2', and the reinforcements 2 and 2' appear and anchor parts 5 and 8 are formed in positions of the reinforcements 2 and 2' in the other of the parallel two sides, and recessed parts 6 and 9 are also provided into which the connection projection parts 4 and 7 of the other precast block 1 are inserted, and the recessed parts 6 and 9 into which the connection projection parts 4 and 7 have been inserted are solidified by being filled with a filler 10 by bringing the sides of the adjacent precast blocks 1 into close contact, so that the precast blocks 1 are mutually connected via the connection projection parts 4 and 7 and the anchor parts 5 and 8.

Description

  The present invention relates to a method for connecting precast blocks that allows adjacent sides of precast blocks to be connected in close contact with each other, and a prestress tank using the same.

  Large tanks such as low-temperature storage tanks that store gases such as LNG and LPG, or liquid storage tanks that store liquids such as water, have generally been built by on-site casting in which concrete is cast at a construction site. When building a tank on-site, build a scaffold on the foundation built on the ground, arrange reinforcing bars at the tank construction site, and provide a formwork that supports the scaffolding so as to sandwich the reinforcing bars. After that, it is constructed by placing concrete between molds and solidifying it. On the other hand, when constructing a high tank such as a large tank, it is difficult to maintain the support strength of the formwork. Build a tank body at the bottom of the height. After that, the upper scaffolding is constructed by adding the upper scaffolding to the scaffolding, a new reinforcing bar is arranged on the upper side of the lower tank body, and after the formwork is installed, the concrete is cast to construct the upper tank body. The tank of a predetermined height is built by repeating this operation.

  However, construction of tanks by on-site casting requires scaffold construction work, rebar placement work, formwork installation work, and concrete placement work. There was a problem that it was efficient, the construction period was extended, and the construction cost increased. In particular, the on-site work has a problem that it cannot proceed to the next work until the concrete is solidified, and further has a problem that it is affected by the weather.

  On the other hand, it has been proposed to simplify the construction of a tank by manufacturing a precast block having crossed reinforcing bars in a factory or the like, transporting this precast block to the site, and using it for construction of a tank.

  In recent years, LNG tanks have been increased in size, and in order to construct such a large tank using a precast block, it is necessary to make the precast block large enough to be transported by a vehicle or the like. For this reason, a precast block of a predetermined size obtained by dividing a tank to be built into a large number in the circumferential direction and the vertical direction is manufactured in advance in a factory, and the tank is transported to the site and connected to each other by connecting them to each other. It is conceivable to build.

  As described above, in order to connect the precast blocks to each other on the site, it is considered to provide connection protrusions in which reinforcing bars protrude at a predetermined length on each of the upper, lower, left and right sides of the precast block.

  As a prior art for constructing tanks using precast blocks, the precast blocks are arranged at intervals in the circumferential direction, and the connecting protrusions of the reinforcing bars protruding from the precast blocks at intervals are hardened by spot casting of concrete. There is one in which precast blocks are connected to each other (Patent Document 1).

JP 2011-122389 A

  However, in patent document 1, in order to connect a precast block mutually, it is necessary to arrange | position a precast block at the space | interval corresponding to a connection protrusion, and a precast block cannot be arrange | positioned closely. For this reason, in Patent Document 1, it is necessary to place concrete on-site between the precast blocks. Therefore, the same construction work as the conventional scaffold, the installation of the formwork for the distance, and the placement of the concrete. Work was required, and as a result, a lot of field work occurred, and the advantages of using precast blocks could not be utilized.

  The present invention has been made in view of the above-mentioned circumstances, and provides a precast block connection method and a prestress tank using the same, in which adjacent precast blocks can be connected with high efficiency in close contact with each other. Objective.

According to the present invention, a connection protrusion in which the reinforcing bar protrudes is provided on one of the two parallel sides of the precast block including the reinforcing bar, and the reinforcing bar appears at the position of the reinforcing bar on the other of the two parallel sides. The anchor portion is formed and a recess into which the connection projection of another precast block is inserted is provided,
The precast block is connected to each other via the connection protrusion and the anchor part by solidifying the recess where the connection protrusion is inserted by closely adhering the sides of the adjacent precast blocks. And a precast block connection method characterized by the above.

In the connection method of the precast block, the recess provided on the upper side of the precast block is a hole into which a reinforcing bar appears to form an anchor portion and a connection protrusion provided on the lower side of the upper precast block is inserted,
The concave portion provided on one of the left and right sides of the precast block can be moved up and down by inserting a connection protrusion provided on the other side of the adjacent precast block. Is a groove part opened up and down,
When connecting the upper and lower adjacent precast blocks, fill the hole on the upper side of the lower precast block with the filler, and then insert the connection protrusion on the lower side of the upper precast block into the hole. So that the upper precast block is in close contact with the lower precast block,
When connecting precast blocks adjacent to the left and right, insert one of the precast blocks into the groove provided on the other side of the adjacent precast block. After the block and the other precast block are brought into close contact with each other, it is preferable to connect by filling the groove with a filler.

  Further, in the precast block connection method, the hole and groove provided in the precast block are formed by placing foamed resin at the position of the reinforcing bar corresponding to the hole and groove when the precast block is manufactured, and placing concrete. Can be formed.

  In the precast block connection method, the filler may be a concrete filler or an epoxy resin filler.

In the present invention, the precast block has a rectangular shape with a reinforcing bar and curved in the left-right direction,
A connection protrusion with a reinforcing bar protruding is provided on the lower side of the precast block, and an anchor part where the reinforcing bar appears is formed at the position of the reinforcing bar on the upper side of the precast block, and the connection protrusion of the adjacent precast block is inserted. There is a hole to be
A precast block is provided with a connecting protrusion that protrudes a reinforcing bar on one side of the left and right sides of the precast block, and an adjacent anchor portion on which the reinforcing bar appears on the other side of the left and right sides. A groove portion that is open at the top and bottom is provided so that the connection projection can be moved up and down.
By inserting the connection protrusions provided on the side part of the other precast block into the groove part provided on the side part of one precast block adjacent in the left-right direction and bringing them into close contact with each other, and then filling the groove part with a filler. A first ring body connected in a ring shape to connect a plurality of precast blocks;
In the upper part of the first ring body, after inserting the connection protrusion provided on the side part of the other precast block into the groove part provided on the side part of one precast block adjacent in the left-right direction, A plurality of precast blocks are connected in an annular shape by filling the groove portions with a filler, and a connection projection provided on the lower side of each precast block connected to the plurality of precast blocks is provided in the first ring body. A second ring body inserted in a hole provided on the upper side and filled with a filler;
A ring body connected to the upper part of the second ring body in the required number of stages;
The precast tank body is configured by
Each ring body of the precast tank body was secured with a prestress wire,
The present invention relates to a pre-stress tank.

  In the prestress tank, the precast block may be provided with a sheath for passing the prestress wire in advance.

  According to the connecting method of the precast block of the present invention and the prestress tank using the same, it is possible to achieve an excellent effect that the adjacent precast block can be connected with high efficiency while being in close contact.

It is a perspective view which shows the connection method of the precast block of this invention, and the structure of a precast block. It is a perspective view which shows the other shape example of the recessed part formed in the upper side of a precast block. (a) is a top view which shows the manufacturing method of the precast block provided with the hole part and the groove part, (b) is the side view which looked at (a) from the IIIB-IIIB direction. It is a perspective view which shows the state to which the precast block adjacent to right and left was connected. It is a perspective view which shows an example of the precast block used for construction of a prestress tank. (a) is a side view of a prestress tank constructed with a precast block, and (b) is a plan view of (a) seen from the VIB-VIB direction.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing an embodiment of a precast block used in the method for connecting precast blocks according to the present invention. The precast block 1 includes a vertical reinforcing bar 2 and a horizontal reinforcing bar 2 'intersecting each other, and is vertically parallel. It has a rectangular shape with two sides 3a and 3b and left and right parallel sides 3c and 3d. The precast block 1 in FIG. 1 (a) has a shape curved in the left-right direction in order to build a tank.

  A connection protrusion 4 from which a vertical reinforcing bar 2 protrudes is provided on the lower side 3b of the precast block 1. The reinforcing bar 2 appears at the position of the vertical reinforcing bar 2 on the upper side 3a of the precast block 1, and the anchor part 5 And a recess 6 into which the connecting projection 4 of another adjacent precast block 1 is inserted is provided.

  The recess 6 provided on the upper side 3 a of the precast block 1 in FIG. 1 is a hole 6 a formed corresponding to each reinforcing bar 2. Moreover, the recessed part 6 provided in the upper side 3a can be made into the expansion hole 6b formed by connecting the said hole 6a in multiple numbers in the left-right direction, as shown in FIG. FIG. 2 shows a case where one hole 6b is formed by connecting all the holes 6a. The hole 6a and the expansion hole 6b are provided in the plane of the upper side 3a of the precast block 1.

  The left side 3c, which is the side part of the precast block 1, is provided with a connection protrusion 7 from which a horizontal rebar 2 'protrudes, and is located at the position of the horizontal rebar 2' on the right side 3d, which is the side part of the precast block 1. Is provided with a recess 9 in which the reinforcing bar 2 ′ appears to form the anchor portion 8 and into which the connecting projection 7 of another adjacent precast block 1 is inserted.

  The concave portion 9 provided on the right side 3d of the precast block 1 is a groove portion 9a opened up and down so that the connection protrusion 7 provided on the left side 3c of the adjacent precast block 1 can be inserted and moved up and down.

  The concave portion 6 and the concave portion 9 are provided to connect the connection protrusion 4 and the anchor portion 5 and the connection protrusion 7 and the anchor portion 8 by supplying the filler 10. As the filler 10 to be supplied to the recess 6 and the recess 9, a concrete filler or an epoxy resin filler can be used. The filler 10 can be used after adjusting to an appropriate viscosity.

  FIG. 3 shows a manufacturing method for manufacturing the precast block 1 having the connection protrusions 4 and 7 and the recesses 6 and 9. In order to manufacture the precast block 1, the vertical reinforcing bars 2 and the horizontal reinforcing bars 2 ′ are arranged so as to intersect with each other, and the mesh rebar assembly 11 is formed by temporarily welding or tying the intersecting portions. Subsequently, the foamed resin P for providing the recesses 6 and 9 in the precast block 1 is attached to the reinforcing bar assembly 11. That is, the columnar foamed resin body 12 for forming the hole 6a including the anchor part 5 is attached to one end of the vertical reinforcing bar 2 corresponding to the anchor part 5 shown in FIG. Further, a foamed resin plate 13 for forming a groove portion 9a including the anchor portion 8 and extending in the vertical direction is attached to one end of the horizontal reinforcing bar 2 ′ corresponding to the anchor portion 8 shown in FIG. As the foamed resin P, a foamed polystyrene can be used, and other materials than the foamed polystyrene can be used as long as they have a predetermined compressive strength and can be easily removed.

  The reinforcing bar assembly 11 to which the foamed resin body 12 and the foamed resin plate 13 are attached is set in a mold 14 having a rectangular shape. At this time, the foamed resin body 12 and the foamed resin plate 13 are set so as to fit inside two orthogonal sides of the mold 14, the other end of the vertical reinforcing bar 2 not having the foamed resin body 12, and the horizontal reinforcing bar The other end without the 2 ′ foamed resin plate 13 is set so as to protrude from the other two orthogonal sides of the mold 14.

  Then, concrete is placed inside the mold 14. Thereby, the precast block 1 in which the reinforcing bars 2, 2 ′ are integrated can be formed.

  Subsequently, the precast block 1 is taken out from the mold 14, and the foamed resin body 12 and the foamed resin plate 13 attached to the reinforcing bar 2 and the reinforcing bar 2 ′ are removed, thereby providing the hole 6a and the groove 9a shown in FIG. A precast block 1 is obtained.

  The precast block 1 can be connected by the following method.

  In FIG. 1, when connecting the precast block 1A and the precast block 1B adjacent in the left-right direction, the precast block 1B is brought close to the precast block 1A, and the connection protrusion 7 of the precast block 1B is connected to the recess 9 of the precast block 1A. Is inserted into the groove 9a, and the precast block 1A and the precast block 1B are brought into close contact as shown in FIG.

  When the precast block 1A and the precast block 1B are in close contact with each other, the groove 9a is closed except for the upper portion as shown in FIG. 4, and the lower end of the groove 9a is closed by the lower precast block 1 or the foundation, so that the groove 9a is filled. By supplying the agent 10, the groove 9 a is filled with the filler 10.

  When the filler 10 is solidified, the precast block 1 </ b> A and the precast block 1 </ b> B are firmly connected via the connection protrusion 7 and the anchor portion 8. Furthermore, even if there is a gap between the precast block 1A and the precast block 1B that are in close contact, the filler 10 penetrates into the gap and is solidified, so that even the surfaces of the sides 3c and 3d are connected with high strength. Is done.

  In FIG. 1, when connecting the precast block 1A and the precast block 1C adjacent in the up-down direction, first, the filler 10 is supplied to the hole 6a which is the recess 6 of the lower precast block 1A, thereby the hole portion 6a is filled with filler 10.

  Subsequently, the precast block 1C is brought close to the precast block 1A, and the connection protrusion 4 of the precast block 1C is inserted into the hole 6a of the precast block 1A so that the precast block 1C is in close contact with the precast block 1A.

  When the filler 10 is solidified, the precast block 1 </ b> A and the precast block 1 </ b> C are firmly connected via the connection protrusion 4 and the anchor portion 5. When the connecting protrusion 4 is inserted into the hole 6a, the filler 10 filling the hole 6a overflows on the upper side 3a by the volume of the connecting protrusion 4 to be inserted. Even if a gap exists between the precast block 1A and the precast block 1C, the filler 10 penetrates into the gap and is solidified, so that the surfaces 3a and 3b are connected with high strength.

  The filler 10 supplied to the hole 6a when connecting the precast block 1A and the precast block 1C adjacent in the vertical direction is bonded instead of using a concrete filler or an epoxy resin filler adjusted to an appropriate viscosity. Agent anchors can be used. The adhesive anchor is one in which an adhesive is sealed in a container made of a glass tube. The adhesive anchor is inserted and arranged in the hole 6a. As described above, when the precast block 1C approaches the precast block 1A and the connection protrusion 4 is inserted into the hole 6a, the container is broken by the connection protrusion 4, so that the hole 6a is made of an adhesive. It is filled.

  When connecting the precast block 1D adjacent to the upper part of the precast block 1B and the right side of the precast block 1C, first, the filler 10 is supplied to the hole 6a of the lower precast block 1B, and the hole 6a is filled with the filler. Fill with 10.

  Subsequently, the connecting projection 7 of the precast block 1D is inserted into the groove 9a of the precast block 1C. In this state, the precast block 1D is lowered, and the connecting projection 4 of the precast block 1D is inserted into the hole 6a of the precast block 1A. Then, the precast block 1D is brought into close contact with the precast block 1B. At this time, the connection projection 7 of the precast block 1D moves downward in the groove 9a of the precast block 1C.

  Since the groove 9a is closed except for the upper part by the close contact of the precast block 1D with the precast block 1C, the filler 10 is supplied to the groove 9a to fill the groove 9a with the filler 10.

  When the filler 10 is solidified, the precast block 1D is firmly connected to the precast block 1B and the precast block 1C. In the above description, the case where the concave portion 6 provided on the upper side 3a of the precast block 1 is the hole portion 6a has been described. However, when the concave portion 6 is the expansion hole 6b as shown in FIG. Can do.

  According to the precast block 1 described above, walls of various structures such as a tank can be constructed by the precast block 1 in close contact.

  FIG. 5 is a perspective view showing an example of the precast block 1 used to configure the precast tank body 15 as shown in FIG.

  The precast block 1 in FIG. 5 has a rectangular shape curved in the left-right direction, and the reinforcing bar assemblies 11 shown in FIG. 3 are provided in two layers in the thickness direction of the precast block 1. And the recessed part 6 which consists of the hole part 6a, and the recessed part 9 which consists of the groove part 9a are each provided in 2 rows so as to correspond to the reinforcing bars 2 and 2 'of the two-layer reinforcing bar assembly 11. Furthermore, a curved sheath 16 extending in the left-right direction is provided at the intermediate position in the thickness direction of the precast block 1. The sheath 16 forms a hole through which a prestress wire 17 (see FIG. 6) for securing the constructed tank from the circumferential direction is passed. As shown in FIG. 3, the sheath 16 is provided by placing it in the mold 14 in advance when the concrete is cast and the precast block 1 is manufactured. Further, as shown in FIG. 6, in the precast block 1 arranged in the cross direction when the precast tank main body 15 is viewed from above, the prestress wire 17 is inserted into the sheath 16 so that the end portion is secured. The protruding portion 18 is provided.

  The precast tank body 15 shown in FIG. 6 is constructed as follows. As shown in FIG. 1, when connecting the lower first precast block 1A and the lower second precast block 1B adjacent in the left-right direction, they are provided on the right side 3d of the lower first precast block 1A. The connecting projection 7 provided on the left side 3c of the lower second precast block 1B is inserted into the groove 9a to bring the left and right precast blocks 1A, 1B into close contact with each other. Subsequently, as shown in FIG. 4, the groove 9 a in which the connection protrusion 7 is inserted is filled with the filler 10 to connect. The required number of precast blocks 1 are connected by repeating the above operation in the left-right direction. As for the connection of the last precast block 1 to form an annular shape, the connection protrusion 7 and the groove 9a provided on the left and right of the last precast block 1 match the groove 9a and the connection protrusion 7 of the adjacent precast block 1. In this state, the last precast block 1 is lowered between the adjacent precast blocks 1 while maintaining the state. And it connects by supplying the filler 10 to the right and left groove part 9a of the last precast block 1 as shown in FIG.

  Thereby, as shown in FIG. 6, the 1st ring body 19 to which the precast block 1 was connected cyclically | annularly is comprised.

  Next, as shown in FIG. 1, after filling the hole 6a provided in the upper side 3a of the precast block 1 of the first ring body shown in FIG. 6 with the filler 10, the upper first precast block 1C The connecting projection 4 provided on the lower side 3b is inserted into the hole 6a filled with the filler 10, and the upper first precast block 1C is brought into close contact with the lower precast block 1A for connection.

  Subsequently, in a state where the hole 6a provided in the upper side 3a of the lower precast block 1B is filled with the filler 10, the upper second precast block 1D has the connecting protrusion 4 provided on the lower side 3b with the filler 10 described above. Is inserted into the hole 6a filled with the above and is brought into close contact with the lower precast block 1B. Further, at this time, in the upper second precast block 1D, the connection protrusion 7 provided on the left side 3c is inserted into the groove 9a provided on the right side 3d of the upper first precast block 1C, so that the upper first precast block 1D is inserted. After closely contacting the block 1C, the groove 9a is filled with the filler 10.

  Thereby, as shown in FIG. 6, the 2nd ring body 20 to which the precast block 1 was connected cyclically | annularly and was connected to the 1st ring body 19 is comprised.

  Furthermore, the precast tank main body 15 shown in FIG. 6 is configured by providing the required number of ring bodies 21 on the upper part of the second ring body 20.

  Thereafter, the prestress wire 17 is passed through the sheath 16 (FIG. 5) provided in the precast block 1 of each ring body 19, 20, 21 shown in FIG. 6, and each ring body 19, 20, 21 is secured. The prestress tank PT is built. Note that the prestress tank PT can be secured by a method other than the method of securing the sheath 16 provided in the precast block 1 through the prestress wire 17 to prestress each ring body 19, 20, 21 from the outside in the circumferential direction. It may be secured using a wire.

  In the above-mentioned present invention, the connecting protrusion 4 in which the reinforcing bars 2, 2 ′ protrude from one of the parallel two sides 3 a, 3 b and the parallel two sides 3 c, 3 d of the precast block 1 having the reinforcing bars 2, 2 ′, 7, and the reinforcing bars 2, 2 ′ appear at the positions of the reinforcing bars 2, 2 ′ on the other sides of the parallel two sides 3 a, 3 b and the parallel two sides 3 c, 3 d, and the anchor portions 5, 8 Are formed, and recesses 6 and 9 into which the connecting projections 4 and 7 of the other precast block 1 are inserted are provided. Accordingly, the sides of the adjacent precast blocks 1 are brought into close contact with each other, and the recesses 6 and 9 into which the connection protrusions 4 and 7 are inserted are filled with the filler 10 and solidified, whereby the connection protrusions 4 and 7 and the anchor portion are solidified. Since the precast block 1 is connected to each other via 5 and 8, the side of the precast block 1 is in close contact, and the precast block 1 is firmly connected by a small amount of filler 10 that fills the recesses 6 and 9 can do.

  On the other hand, the recess 6 provided on the upper side 3a of the precast block 1 has a hole 6a into which the reinforcing bar 2 appears to form the anchor portion 5 and into which the connection protrusion 4 provided on the lower side 3b of the upper precast block 1 is inserted. The recess 9 provided on one of the left and right sides of the precast block 1 has a connection protrusion provided on the other left and right side of the adjacent precast block 1 with a reinforcing bar 2 'appearing to form an anchor portion 8. The groove portion 9a is opened vertically so that the portion 7 can be inserted and moved up and down. Then, when connecting the precast blocks 1A and 1C adjacent in the upper and lower directions in FIG. 1, after filling the hole 6a provided in the upper side 3a of the lower precast block 1A with the filler 10, the upper precast block 1C The upper precast block 1C can be brought into close contact with and connected to the lower precast block 1A so that the connection protrusion 4 provided on the lower side 3b is inserted into the hole 6a. When connecting the precast blocks 1A and 1B adjacent to the left and right, the connecting projection 7 provided on the side of the precast block 1B is inserted into the groove 9a provided on the side of the precast block 1A. After the close contact of 1A and 1B, the groove portion 9a can be connected by filling with the filler 10. Therefore, the precast block 1 adjacent in the horizontal direction and the vertical direction is firmly connected to the precast block 1 with a small amount of filler 10 filling the hole 6a and the groove 9a with the sides of the precast block 1 being in close contact with each other. can do.

  The hole 6a and the groove 9a provided in the precast block 1 are arranged by placing the foamed resin P at the positions of the reinforcing bars 2, 2 'corresponding to the hole 6a and the groove 9a when the precast block 1 is manufactured. Therefore, the hole 6a and the groove 9a can be easily provided.

  As the filler 10, a concrete filler or an epoxy resin filler can be used. Therefore, by adjusting the viscosity of the filler 10, the filler 10 can be infiltrated into the gaps between the closely attached precast blocks 1 to be solidified. Therefore, it is possible to connect with high strength including the surfaces of the sides 3a and 3b and the sides 3c and 3d.

  Further, as shown in FIG. 6, a first ring body 19 in which the precast block 1 is connected in an annular shape, a second ring body 20 connected to the top of the first ring body 19, and a second ring body The precast tank main body 15 can be constituted by the ring body 21 connected to the upper part of 20 in the required number of stages. Since the precast tank main body 15 is constituted by the closely contacted precast block 1, only a small amount of the filler 10 that fills the hole 6a and the groove 9a is supplied on site, and the precast tank main body 15 having uniform strength is provided. It can be built with high efficiency.

  Then, the prestress tank PT is constructed by securing the ring bodies 19, 20, 21 of the precast tank body 15 with the prestress wire 17. Accordingly, the prestress tank PT can maintain a high strength by the strength of the precast tank body 15 and the securing by the prestress wire 17.

  In addition, the connection method of the precast block of the present invention and the prestress tank using the same are not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention. Of course.

1 Precast block 1A Precast block (lower first precast block)
1B precast block (second precast block at the bottom)
1C precast block (first precast block at the top)
1D precast block (second precast block at the top)
2 Reinforcing bar 2 'Reinforcing bar 3a Side (upper side)
3b side (bottom side)
3c side (left side)
3d side (right side)
4 connection protrusion 5 anchor part 6 recess 6a hole (recess)
7 Connecting Projection 8 Anchor 9 Recess 9a Groove (Recess)
10 Filler 11 Reinforcing bar assembly 12 Foamed resin body (foamed resin P)
13 Foamed resin board (foamed resin P)
15 Precast tank body 16 Sheath 17 Prestress wire 19 First ring body (ring body)
20 Second ring body (ring body)
21 Ring body PT Prestress tank

Claims (6)

One of the two parallel sides of the precast block with the reinforcing bars is provided with a connecting projection from which the reinforcing bars protrude, and the reinforcing bar appears at the position of the reinforcing bar on the other of the two parallel sides, and the anchor portion is Formed and provided with a recess into which the connecting projection of another precast block is inserted,
The precast block is connected to each other via the connection protrusion and the anchor part by solidifying the recess where the connection protrusion is inserted by closely adhering the sides of the adjacent precast blocks. A precast block connection method characterized by the above. The recess provided on the upper side of the precast block is a hole into which a reinforcing bar appears to form an anchor portion and a connection projection provided on the lower side of the upper precast block is inserted,
The concave portion provided on one of the left and right sides of the precast block can be moved up and down by inserting a connection protrusion provided on the other side of the adjacent precast block. Is a groove part opened up and down,
When connecting the upper and lower adjacent precast blocks, fill the hole on the upper side of the lower precast block with the filler, and then insert the connection protrusion on the lower side of the upper precast block into the hole. So that the upper precast block is in close contact with the lower precast block,
When connecting precast blocks adjacent to the left and right, insert one of the precast blocks into the groove provided on the other side of the adjacent precast block. The method for connecting a precast block according to claim 1, wherein after the block and the other precast block are brought into close contact with each other, the groove is filled with a filler.   The hole and groove provided in the precast block are formed by placing foamed resin at a position of a reinforcing bar corresponding to the hole and groove and placing concrete at the time of manufacturing the precast block. Or the connection method of the precast block of 2.   The precast block connection method according to any one of claims 1 to 3, wherein the filler is a concrete filler or an epoxy resin filler. The precast block has a rectangular shape with reinforcing bars and curved left and right,
A connection protrusion with a reinforcing bar protruding is provided on the lower side of the precast block, and an anchor part where the reinforcing bar appears is formed at the position of the reinforcing bar on the upper side of the precast block, and the connection protrusion of the adjacent precast block is inserted. There is a hole to be
A precast block is provided with a connecting protrusion that protrudes a reinforcing bar on one side of the left and right sides of the precast block, and an adjacent anchor portion on which the reinforcing bar appears on the other side of the left and right sides. A groove portion that is open at the top and bottom is provided so that the connection projection can be moved up and down.
By inserting the connection protrusions provided on the side part of the other precast block into the groove part provided on the side part of one precast block adjacent in the left-right direction and bringing them into close contact with each other, and then filling the groove part with a filler. A first ring body connected in a ring shape to connect a plurality of precast blocks;
In the upper part of the first ring body, after inserting the connection protrusion provided on the side part of the other precast block into the groove part provided on the side part of one precast block adjacent in the left-right direction, A plurality of precast blocks are connected in an annular shape by filling the groove portions with a filler, and a connection projection provided on the lower side of each precast block connected to the plurality of precast blocks is provided in the first ring body. A second ring body inserted in a hole provided on the upper side and filled with a filler;
A ring body connected to the upper part of the second ring body in the required number of stages;
The precast tank body is configured by
Each ring body of the precast tank body was secured with a prestress wire,
A pre-stress tank characterized by that.   The pre-stress tank according to claim 5, wherein the pre-cast block includes a sheath for allowing a pre-stress wire to pass through.

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