JPH1037288A - Cylindrical concrete structure and construction method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To construct a large scale structure not being constructed so far because of impossible transportation and easily fit the faces of respective blocks by temporarily tensioning PC steel members for fastening the upper and lower blocks by a temporary tensioning means and increase the fitting accuracy of joints at the fitting faces of respective blocks. SOLUTION: This cylindrical product U is provided with a lower concrete block 1 opened at the upper face, in which PC steel members 4 are embedded, an upper concrete block 3 opened at the lower face, an intermediate block 2 put on the lower block 1, on which the upper block is put, a plurality of sheath holes 11v in which the PC steel members 4 for fastening the upper and lower blocks which are arranged in the wall body of the upper block 3 and the intermediate block 2, are inserted, and a temporary tensioning means are provided at least at one opening of the sheath holes 11v of the intermediate block 2 and connected to the PC steel members 4 embedded in the lower block 1, to temporarily tension the PC steel member 4 inserted in the sheath holes 11v of the intermediate block 2. These cylindrical concrete products U are connected to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tubular concrete structure, such as a culvert, a square water tank, a square manhole, an underpass, a common ditch, and the like, which is constructed of a multi-partitioned tubular concrete product, and a method of constructing the same. Things.

[0002]

2. Description of the Related Art Conventionally, when a tubular concrete structure, such as a box culvert, constructed by vertically tightening a plurality of tubular concrete products, is precast, it is difficult to manufacture and transport the concrete structure because of its weight and size. In some cases, precasting is difficult due to restrictions. As means for solving these problems, it is conceivable to divide the cylindrical concrete product into a plurality of blocks. That is, for example, when transporting from a factory to a site by a trailer, the height of articles to be loaded is limited. Therefore, the height may be divided into upper and lower portions to be less than the limit. Such blocks are connected to each other at the site to construct a tubular concrete product of a required size, and a plurality of the tubular concrete products can be vertically tightened to construct a tubular concrete structure. Each block can be reduced to half the size of the finished tubular concrete product, which facilitates precasting.

[0003]

By the way, when the cylindrical concrete structure is particularly large, that is, when the cylindrical concrete product is extra-large, the precasting may be restricted even if it is divided into two parts. In consideration of such circumstances, it has been considered to subdivide the cylindrical concrete product into three or more divisions. However, when the number of divisions is increased, the dividing method and the assembling method become complicated, and the economy is poor. That is, for example, if the number of divisions is increased, the joint surface between the blocks is increased by that amount. However, if the blocks are not joined with high accuracy, the sectional force (shear force, bending moment, ) Cannot be transmitted. In terms of the construction period,
If it becomes difficult to align the blocks, an error will occur.
Ancillary work such as processing such as mortar filling with a gap increased, and as a result, much time was required for construction.

An object of the present invention is to solve such a problem.

[0005]

In order to achieve the above object, the present invention takes the following measures. That is, the tubular concrete structure according to the present invention comprises an upper, lower and intermediate block, a sheath hole for inserting a PC steel material for upper and lower fastening for fastening and coupling the respective blocks, a lower block and an intermediate block. And a plurality of tubular concrete products having temporary tensioning means for temporarily tensioning the PC steel material inserted therethrough. In this way, by dividing the tubular concrete product into upper, lower and intermediate blocks, each block can be easily precast. In addition, since the lower block and the intermediate block are placed on the upper block in a state where the PC steel material is temporarily tensioned, it is possible to secure the safety of construction during construction and to facilitate the surface matching of each block. it can.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a concrete lower block having an upper surface opening type in which a PC steel material is embedded, a concrete upper block having a lower surface opening type, and an upper block mounted on a lower block. An intermediate block to be placed, a plurality of sheath holes for inserting a PC steel material for upper and lower fastening disposed in a wall of the upper block, the lower block, and the intermediate block, and at least one of a sheath hole of the intermediate block. Temporary tension means for temporarily tensioning the PC steel material provided in the opening and connected to the PC steel material embedded in the lower block and inserted into the sheath hole of the intermediate block, wherein the intermediate block is attached to the lower block. After pre-tensioning the PC steel in the mounted state, the upper block is placed on the intermediate block, and the upper, middle and lower blocks are tightly joined by the PC steel up and down to form a cylindrical conc. Over DOO product is a cylindrical concrete structure characterized by being more connected.

The provisional tensioning means is preferably formed of a fixing plate provided on at least one of the joining surfaces of the upper block and the lower block of the intermediate block and a recess for accommodating a nut. In order to improve the rust-preventive performance of the PC steel material and prevent the displacement of the joined blocks, it is preferable to fill the sheath hole with grout, for example, after constructing the tubular concrete product. It is preferable that the intermediate block is provided with a lateral through-hole that is opened in the side wall surface of the intermediate block and communicates the inside and the outside.

In order to facilitate the construction of a tubular concrete product, it is desirable that the upper, lower, and intermediate blocks are provided with concave and convex engaging portions on their joint surfaces. Such a concavo-convex engagement portion may be composed of an engagement recess provided on one of the opposing joint surfaces and an engagement protrusion provided on the other joint surface. As such an engagement recess,
For example, an insert nut may be used, and a corresponding engagement protrusion may be a rod having an outer diameter that can be inserted into the insert nut and that is detachably attached. Alternatively, it may be composed of an engagement recess provided on one of the opposed joining surfaces and having a tapered shape, and a tapered engagement protrusion fitted into the engagement recess. Further, the engaging projection may be formed by a step portion on the inner surface side of the lower block, and the corresponding engaging concave portion may be a step portion in which the inner surface side of the upper block is retracted upward.

In order to facilitate the alignment of the respective blocks, the upper, lower and intermediate blocks are provided with a guide member for aligning the side surfaces at least on the inner side surface of the tubular concrete product. The one provided with the insert nut described above is preferable. In the face-to-face matching, especially in order to increase the accuracy of the face-to-face matching in the connecting direction of the cylindrical concrete product, that is, in the vertical tightening direction,
The upper, lower, and intermediate blocks are provided with an insert nut on the connecting surface for attaching a rigid body that makes the next constructed structure closely adhere to the already constructed tubular concrete product by vertical tightening and aligns its connecting surface. Are preferred.

In order to facilitate the construction of a tubular concrete product having a particularly large dimension in the height direction, the lower block is
It is desirable to provide an insert nut for mounting a rail for an assembling trolley on the upper surface of the bottom plate.
The lower block and the upper block preferably have the same shape. In this case, the height of the wall in which the sheath hole is formed may be the same, or one wall may be formed higher than the other wall. May be provided. In this case, it is preferable to construct such that the intermediate blocks of adjacent tubular concrete products are alternately arranged in two stages.

The intermediate block combined with the upper and lower blocks is preferably a flat block. Further, in order to form a multilayer structure in which cylindrical concrete products are stacked, for example, in two stages, the intermediate block is provided with a horizontal flat plate portion and side wall portions formed vertically at both ends of the flat plate portion. Is desirable. Further, the present invention is a method for constructing a tubular concrete structure according to claim 1, wherein the lower block is disposed at a predetermined position,
The lower block and the intermediate block are surface-matched by the guide member in a state where the intermediate block is suspended above the lower block. The PC steel material penetrating through the block is temporarily tensioned, the upper block is suspended on the intermediate block, the intermediate block and the upper block are aligned by the guide member in a state where the upper block is suspended, and the intermediate block is The upper block is placed on the upper part, the PC steel material penetrating the upper block is connected to the pretensioned PC steel material, and then tensioned to construct a tubular concrete product. A tubular concrete structure is constructed by connecting tubular concrete products to form a tubular concrete structure.

In order to improve the accuracy of the mating of the connecting surfaces of the tubular concrete product, when connecting a plurality of unit structures, a rigid body is detachably attached to the connecting surface of the constructed tubular concrete product, Closely contact the already built tubular concrete product, apply tension between the rigid body and the other tubular concrete product with a tension bar, and make the connection surface of the tubular concrete product with the rigid body flush. What should I do?

Further, the present invention relates to a method for constructing a tubular concrete structure according to claim 1, wherein a lower block of a tubular concrete product to be constructed next is connected to a tubular concrete product already constructed. The lower block and the intermediate block are aligned by the guide member in a state where the intermediate block is suspended above the block, and the intermediate block is placed on the lower block in a state where the alignment is completed, and the lower block and the intermediate block are separated. Temporarily tension the PC steel material penetrating the
This intermediate block is connected to the already built tubular concrete product, and the upper block is hung on the intermediate block, and the guide block is used to perform surface matching between the intermediate block and the upper block. The upper block is placed on the intermediate block, this upper block is connected to the already constructed tubular concrete product, the PC steel material penetrating the upper block is connected to the pre-tensioned PC steel material, and then the next cylinder is tightened. The present invention provides a method for constructing a tubular concrete structure, which comprises constructing a tubular concrete product and repeating these steps to construct a tubular concrete structure.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. The tubular concrete structure CP is constructed by vertically fastening a plurality of tubular concrete products U. Further, the tubular concrete product U has an intermediate block 2 placed on the lower block 1, an upper block 3 placed on the intermediate block 2, and a plurality of PC steel members 4 for lower, intermediate and upper blocks. It is constructed by tightening the upper, lower, upper, lower, and upper joints.

The lower block 1 is made of precast concrete having an open top surface, and is buried with the side walls 1b standing upright on both sides of the bottom slab 1a and the axes in the respective side walls 1b in the vertical direction. And a plurality of PC steel materials 4 for upper and lower fastening. In this embodiment, the slab 1
a having a connection box 6 for the PC steel 5 for vertical fastening only at the haunch portion 1c which is an intersection of the side wall 1a and the side wall 1b, and a device having the connection box 6 also in the side wall 1b.
When preparing the types and constructing the tubular concrete structure CP, one of them is selectively used according to the position in the longitudinal tightening direction. The lower end of the PC steel material 4 for tightening up and down is fixed by the fixing plate 9 and the nut 7 embedded in the bottom plate 1a, and the upper end thereof is in the concave portion 1d provided on the joining surface 8 which is the upper end surface of the side wall 1b. Located in. This recess 1d is
It is formed with an internal method sufficient to insert the coupler 10 connecting the C steel material 4, and after the PC steel material 4 is tensioned, the sheath hole 1 is formed.
In order to inject grout to be filled in 1v, a lateral through hole 1e opened to the inner surface side of the side wall 1b and communicating with the inside of the recess 1d is provided. Further, the lower block 1 includes a plurality of sheath holes 11r formed in the horizontal direction of the side wall 1b, that is, in the vertical tightening direction of the tubular concrete product U.

Further, a guide steel member 13a, which is a guide member for performing surface alignment with the connection surface 12 of the intermediate block 2, is attached to an upper end portion of the connection surface 12 formed of a front end surface in the longitudinal tightening direction of the lower block 1. Insert nut 14
And an insert nut 14 for mounting a guide steel material 13b as a guide member for aligning the inner surface 2a of the intermediate block 2 with the inner surface 2a of the intermediate block 2 is embedded in an upper end portion near the connecting surface 12 before and after the inner surface of the side wall 1b. I have. Also,
Similarly, on the joint surface 8 of the side wall 1b, a guide key 16 serving as an engagement projection forming an uneven engagement portion is screwed to an insert nut 14 buried in the side wall 1b to be erected. The guide key 16 has a male screw formed at its base end, and has a slightly smaller outer diameter at its distal end than the male screw, and is exposed at the lower joining surface 8 of the intermediate block 2.
It can be inserted into the insert nut 14 which is an engagement concave part forming the concave and convex engagement part. In addition, an insert nut 14 for fixing a flat steel material 17 serving as a rail for guiding an assembling work vehicle V used when constructing the tubular concrete product U is embedded in the bottom slab 1a. The insert nut 14 may be used to screw a suspending tool for suspending the lower block 1 during construction. In this embodiment, a hanging member (not shown) is separately provided on the upper surface of the bottom plate 1a, and a hanging member 18 is also provided on the lower surface of the bottom plate 1a.

In this embodiment, the intermediate block 2 is a flat block made of precast concrete having the same thickness as the side wall 1b of the lower block 1 and the same depth as the side wall 1b, that is, the same length in the vertical tightening direction. PC for vertical tightening
Two types are prepared, one having a connection box 6 for steel 5 and the other not having a connection box 6, both of which are connected to the PC steel 4 embedded in the lower block 1 in the vertical direction.
A plurality of sheath holes 11v through which the C steel material 4 is inserted are formed. The openings at the upper and lower ends of the sheath hole 11v communicate with the concave portions 2c and 2b provided on the upper and lower joint surfaces 8. The upper concave portion 2c constitutes a temporary tensioning means, and includes a fixing plate 9 having a through hole 9a for leading out grout and a washer w.
It has an internal method capable of accommodating the nut and the nut 7, and is provided with a horizontal through hole 2d for injecting grout, which communicates the inside and the outside of the concave portion 2c. On the other hand, the lower recess 2b
In this embodiment, unlike the upper concave portion 2c, the inner size is smaller, and the coupler 1 for connecting the PC steel material 4 is different from the upper concave portion 2c.
It is formed in a size that can accommodate 0. Similarly, a plurality of sheath holes 11r through which the PC steel material 5 for vertical tightening is inserted are provided so as to penetrate in the depth direction, that is, from the front connection surface 12 to the rear connection surface 12.

In order to facilitate construction, the intermediate block 2 is provided with an insert nut 14 having the following functions.
Is provided. That is, corresponding to the lower block 1 and the upper block 3, insert nuts 14 for attaching the guide steel 13a are buried in the upper and lower end portions of the connecting surface 12 in the front and rear directions in the longitudinal tightening direction. Insert nuts 14 for mounting the guide steel 13b are embedded in the upper and lower end portions near the connection surface 12. Further, an insert nut 14 serving as an engagement concave portion forming an uneven engagement portion corresponding to the guide key 16 of the lower block 1 is embedded in the joint surface 8 on the lower end surface of the intermediate block 2, and the joint surface on the upper end surface In FIG. 8, a guide key 16 is screwed to an embedded insert nut 14 to form an engagement projection of an uneven engagement portion.

The upper block 3 is made of precast concrete having an open bottom surface, and has basically the same shape as the lower block 1. A side wall 3b, which is a wall hanging down on both sides of the top plate 3a, and a plurality of sheath holes 11v formed in the respective side walls 3b and having their axes aligned vertically. The upper end of the sheath hole 11v communicates with the concave portion 3d provided on the top plate 3a, and the lower end communicates with the concave portion 3c provided on the joint surface 8, which is the lower end surface of the side wall 3b. The upper concave portion 3d has an internal method in which the fixing plate 9, the washer w and the nut 7 can be housed, and the lower concave portion 3c has a sufficient internal space for the coupler 10 for connecting the PC steel material 4. The law is formed. Also, upper block 3
Is provided with a plurality of sheath holes 11r formed in the horizontal direction of the side wall 3b, that is, in the vertical tightening direction of the tubular concrete product U. In this embodiment, corresponding to the lower block 1 and the intermediate block 2, the upper block 3 is also provided with a connection box 6 for the PC steel 5 for vertical fastening only in the haunch portion 3e, and in the side wall 3b. Are also provided with a connection box 6, and one of them is selectively used for construction.

Further, the lower end of the connecting surface 12 and the side wall 3b, which are the front and rear end surfaces of the upper block 3 in the longitudinal tightening direction.
A lower block 1 is provided at the lower end portion near the connection surface 12 on the inner surface.
Similarly, an insert nut 14 for attaching a guide steel material 13a, which is a guide member for aligning the inner surface of the intermediate block 2, and an insert nut 14 for attaching a guide steel material 13b for aligning the coupling surface 12 are provided. It is buried. Similarly, an insert nut 14 serving as an engagement recess forming an uneven engagement portion is buried in the joint surface 8 between the blocks in the vertical direction formed by the lower end surface of the side wall 3b.

The guide steel 13a is made of an equilateral angle steel, and the guide steel 13b is made of a channel steel. A support steel material 15 for holding the intermediate block 2 can be attached to the guide steel material 13b. The support steel 15 is composed of two bars, each of which has one end connected to a guide steel 13b attached to the lower block 1 and the other end facing the guide steel 13b of the intermediate block 2. It is connected to the guide steel material 13b attached to the surface to be formed. That is, the respective rods are attached in a brace shape, and the two can be connected at the intersection.

The tubular concrete structure CP is constructed on site as follows. In this embodiment, a tubular concrete product U is sequentially constructed, and the constructed tubular concrete product U is attracted to the already constructed tubular concrete product U using the PC steel material 5 for longitudinal tightening, and the constructed tubular concrete product U is constructed. Upper, middle and lower blocks 1, 2, 3, U
The vertical concrete tightening is performed such that the connecting surfaces 12 of the cylindrical concrete structures are flush with each other to construct a cylindrical concrete structure CP including a plurality of cylindrical concrete products U.

First, when the lower block 1 is installed, the guide key 16 and the coupler 10 are attached to predetermined positions in advance. And each guide steel material 13
a, 13b are temporarily fixed by bolts 19. Next, the intermediate block 2 is prepared. That is, the intermediate block 2 is
A guide key 16 is attached to the upper joint surface 8, a PC steel material 4 for tightening up and down, a fixing plate 9 and a washer w are attached to an upper end thereof, and a nut 7 is screwed into the sheath hole 11v. In a suspended state. Further, guide steel materials 13a and 13b for surface matching with the upper block 3 are temporarily fixed to the upper end side of the intermediate block 2. The intermediate block 2 is hung above the lower block 1 and a guide key 16 fixed to the lower block 1 is provided.
Is inserted into the insert nut 14 of the lower joint surface 8 of the intermediate block 2, and the guide steel members 13 a, 13 b temporarily fixed to the lower block 1 while the intermediate block 2 is suspended.
Is temporarily fixed to the intermediate block 2, and the PC steel material 4 in the intermediate block 2 is connected to the PC steel material 4 in the lower block 1 via the coupler 10. In this state, the intermediate block 2 is guided by the guide key 16 and the guide steel members 13a and 13b, and is placed at a predetermined position of the lower block 1.

Thereafter, the inner surfaces of the lower block 1 and the intermediate block 2 and the connecting surface 12 are aligned by fixing the guide steel materials 13a and 13b, and the lower block 1 and the intermediate block 2 are connected to the guide steel materials 13a and 13b. Then, a hydraulic jack is attached to the upper end of the connected PC steel member 4 to temporarily tension the vertically tightened PC steel member 4 and the nut 7 is put on. Then, the lower block 1 and the intermediate block 2 are mutually supported by the support steel material 15 to prevent the intermediate block 2 from falling down.

Next, similarly to the intermediate block 2, the upper block 3 is prepared with the PC steel material 4 suspended in the sheath hole 11v for vertically tightening the upper block 3. The upper block 3 is suspended above the intermediate block 2, and the guide key 16 fixed to the intermediate block 2 is inserted into the insert nut 14 on the joint surface 8 of the upper block 3, and temporarily fixed to the upper end of the intermediate block 2. Guide steel materials 13a, 13
b is temporarily fixed to the upper block 3 and the upper block 3
The PC steel material 4 in the inside is connected to the PC steel material 4 in the intermediate block 2 via the coupler 10. Then, the respective guide steel materials 13a, 13b are fixed, and the respective blocks 1, 2, 2,
3, the nut 7 is fixed by tightening the vertically tightened PC steel material 4. When the fixing is completed, the respective guide steel members 13a and 13b are removed, and the concave portions 1d and
The grout is removed from the lateral through holes 1e, 2d of the recess 2d, 2d.
c and the inside of the sheath hole 11v.

As described above, when the tubular concrete product U is constructed, by using the guide steel materials 13a and 13b, the guide keys 16 and the blocks 1, 2 and 3 are aligned with each other. Can be performed accurately. In addition, since the guide key 16 remains on the joint surface 8 in the state where the joint surface 8 is tightened up and down, the guide key 16 can reinforce the shear force against the external force of the joint surface 8.

The guide key 16 may be attached to the lower joint surface 8 of the upper block 3 and the lower block 1 downward. In this case, for example, a capsule containing an epoxy resin is inserted into the insert nut 14 which is an engagement concave portion into which the guide key 16 is inserted, and when inserted, the capsule is crushed and the internal resin is filled into the insert nut 14. The configuration may be such that:

As described above, the tubular concrete product U
Is constructed, and the tubular concrete product U is drawn to the already constructed tubular concrete product U using the tension bar 21 to construct the tubular concrete structure CP. The pulling is performed by the haunch portions 1c and 3 of the tubular concrete product U.
In step e, the tension bar 21 is connected to the PC steel member 5 for longitudinal tightening. That is, in the case of this embodiment, since the tension required to pull one tubular concrete product U is sufficient as the total tension of the four tension rods 21, it is already constructed and tightened vertically. A tension rod 21 penetrating the cylindrical concrete product U to be drawn is connected to the PC steel material 5 for vertical tightening of a plurality of cylindrical concrete products U, and the hydraulic jack O
The four tension rods 21 are evenly tensioned by J. As a result, the constructed tubular concrete product U is
Is moved by being pulled by the tension force of the above, and comes into close contact with the tubular concrete product U already constructed. Thereafter, the hydraulic jack OJ and the tension bar 21 are removed, and the connecting surface 12 of the drawn tubular concrete product U is aligned.

Since the cylindrical concrete product U drawn as described above is formed by the tension bar 21 in the haunch portions 1c and 3e, even if the cylindrical concrete product U has been completely tightened up and down, it is connected. On the surface 12, the connecting surface 12 of each of the blocks 1, 2, 3 may be slightly, but slightly stepped. In order to correct the irregularity of the connecting surface 12, a grooved steel material 20 is attached to the exposed connecting surface 12 of the drawn tubular concrete product U, that is, the front connecting surface 12 by screwing a bolt 19 to an insert nut 14. This channel steel material 20 has an insert nut 1
4 and a through hole smaller than the outer diameter of the hydraulic jack OJ is formed corresponding to the position of the PC steel material 5 for vertical tightening. Therefore, a vertical tightening operation is performed in a state where the channel steel member 20 is fixed, the tension of the tension bar 21 is applied to the channel steel member 20, and the connecting surfaces 12 are aligned with the channel steel member 20. is there.

Before installing the channel steel member 20, the tension bar 21 is connected via the coupler 10 to all the longitudinally tightened PC steel members 5 in the respective blocks 1, 2, 3 of the already constructed tubular concrete product U. Concatenate. Then, the hydraulic jacks OJ are attached to the respective tension rods 21 via the channel steel members 20, and a predetermined tension is applied to the hydraulic jacks OJ.
Thereby, the connecting surfaces 12 of the blocks 1, 2, 3 are made flush. Thereafter, the hydraulic jack OJ, the channel steel 20 and the tension bar 21 are removed, and the PC steel 5 is used to perform longitudinal tightening, thereby introducing prestress into the tubular concrete structure CP.

As described above, since the connecting surface 12 is aligned by vertical tightening using the channel steel material 20, the cylindrical concrete product U is divided into upper, middle and lower blocks 1, 2, and 3. This can prevent the occurrence of a gap. In addition, since the tubular concrete product U is vertically tightened, a required prestress can be reliably introduced into the entire tubular concrete product U in a state suitable for the purpose.

In the above embodiment, after the cylindrical concrete product U is constructed, the cylindrical concrete structure CP is constructed by drawing using the sheath holes for vertical tightening.
The lower block 1 is connected to the already constructed tubular concrete product U in the vertical tightening direction, similarly, then the intermediate block 2 is connected, and finally, the upper block 3 is connected to connect the tubular concrete structure CP. May be constructed.
Also in this example, the lower block 1, the intermediate block 2, and the upper block 3 are prepared by attaching members necessary for construction in advance similarly to the above-described embodiment.

That is, one cylindrical concrete product U
After constructing the following, when constructing the next tubular concrete product U, first, the lower block 1 of the tubular concrete product U to be constructed next is longitudinally fastened to the already constructed tubular concrete product U. In this case, the guide members 13a and 13b are temporarily fixed to the side wall 1b, and the guide key 16 is screwed to the insert nut 14. Next, while the intermediate block 2 is suspended above the lower block 1, the upper ends of the guide members 13a and 13b temporarily fixed to the lower block 1 are temporarily fixed to the intermediate block 2, and the guide is performed in this state. The intermediate block 2 is placed on the lower block 1 while being guided by the key 16. Here, the guide members 13a and 13b are fixed, and the lower block 1 and the intermediate block 2 are aligned. When the alignment is completed, the guide members 13a, 1
3b is removed, and the PC steel material 4 embedded in the lower block 1 for up / down tightening and the PC steel material 4 inserted into the sheath hole 11v of the intermediate block 2 are connected by the coupler 10 and temporarily tensioned. Thereafter, the intermediate block 2 is longitudinally fastened to the already constructed tubular concrete product U.

Similarly, while the upper block 3 is suspended above the intermediate block 2, the guide members 13a, 13b
Is temporarily fixed to the upper member 3 and the intermediate block 2 and the upper block 3
And the upper block 3 is placed on the intermediate block 2 in a state where the surface matching is completed. Then, after removing the guide members 13a and 13b, the upper block 3 is longitudinally fastened to the tubular concrete product U already constructed. Finally, after connecting the PC steel material 4 penetrating the upper block 3 to the temporarily tensioned PC steel material 4 for upper and lower tightening,
Complete the vertical tightening.

Thus, in this example, each of the blocks 1 and 2 is added to the tubular concrete product U already constructed.
By vertically tightening the parts 2 and 3 separately, the alignment of the cylindrical concrete products U at the connecting surfaces 12 is omitted. In the above embodiment, when the tubular concrete product U is relatively high, it may be necessary to provide a scaffold for assembling on the front side and the inside of the construction direction, or on the outside, but the scaffold is made of tubular concrete. Since it is necessary to move the product U in accordance with the connection of the product U, workability may be reduced as compared with a case where a scaffold is not required. In order to deal with such a case, the bottom plate 1a of the lower block 1
An assembling work having an insert nut 14 embedded in parallel with the longitudinal tightening direction, using the insert nut 14 to fix, for example, a flat steel material 17 serving as a rail, and having a wheel t rolling on the flat steel material 17 What is necessary is just to comprise so that the bogie V can run. The assembling work cart V is provided with a scaffold whose height and width can be changed by a jack J and is manufactured in a size corresponding to the internal method of the tubular concrete product U, and is used instead of the support steel material 15 described in the above embodiment. Has a function of supporting the intermediate block 2 placed on the lower block 1. The length of the assembling work vehicle V in the vertical tightening direction is set to, for example, about four times the dimension of the cylindrical concrete product U in the vertical tightening direction, and the front end portion of the cylindrical concrete structure has been constructed so far. What is necessary is just to set so that it can be used even if it protrudes from the front end of the CP. Further, the height of the assembly work vehicle V may be set to a height at which the intermediate block 2 and the upper block 3 are joined. The use of such an assembly work cart V facilitates the movement of the scaffold, and has a function of supporting the intermediate block 2, so that the work time can be shortened by eliminating the need to attach the support steel material 15, and the construction is further improved. The next operation can be anticipated by extending the front surface of the inner cylindrical concrete structure CP, and the operation can be performed safely and efficiently even in a large-sized cylindrical concrete product U.

In the embodiment described above, the tubular concrete product U is described as being composed of three blocks of lower, middle and upper blocks 1, 2, and 3. However, as shown in FIG. It may be used by being stacked in a plurality of stages. Further, as shown in FIG. 29, the intermediate block 201 is composed of a partition wall 201a parallel to the bottom plate 1a of the lower block 1, which is a horizontal flat plate portion, and side wall portions formed at both ends of the flat plate portion. It may be provided with a side wall 201b located on the side wall 1b of the lower block 1 and integrally connected by a partition wall 201a. By using such an H-shaped intermediate block 201 as viewed from the front, a cylindrical concrete product U having a multilayer structure can be constructed.

Further, as shown in FIG. 30, the shapes of the lower block 101 and the upper block 301 are
a and the side wall 101b,
Partition walls 101c and 301c having the same height as 301b may be provided. That is, the bottom plate 101a and the top plate 301a are vertically separated by the partition walls 101c and 301c.
It is a divided shape, whereby the cylindrical concrete product U can have a large diameter. When the intermediate block 2 of the above embodiment is used for such lower and upper blocks 101 and 301, a cylindrical concrete product U having a single-layer, two-diameter structure can be constructed. By providing two such partition walls, for example, a cylindrical concrete product U having a one-layer three-diameter structure can be constructed.

Further, as shown in FIG. 31, a vertical partition 102c is provided on the bottom plate 102a of the lower block 102, a partition 302c is provided on the top plate 302a of the upper block 302, and the horizontal partition 202 of the intermediate block 202 is provided.
By providing the vertical partition wall 202c at a, a large cylindrical concrete product U having a multi-layer, multi-diameter structure can be constructed. Such partition walls 102c, 302c, 202c
Lower, middle and upper blocks 102, 202, 30
2 and the plate-shaped intermediate block 2, by adjusting the number of the partition walls 102c, 302c, 202c, it is possible to construct a cylindrical concrete product U having a multilayer multi-diameter structure.

Further, by combining the intermediate block 2 of the above embodiment with the lower block 103 and the upper block 303 without a haunch portion, as shown in FIG. 32, a cylindrical concrete product U different from the above embodiment is constructed. You can also.
Further, as shown in FIG. 33, another cylindrical concrete product U can be constructed by replacing the upper block 3 in the cylindrical concrete product U of the above embodiment with the upper block 303 having no haunch portion. In this way, by preparing a plurality of types of lower, middle and upper blocks and constructing a tubular concrete product by combining them, it is possible to construct various tubular concrete structures having different sizes and functions.

In addition, as shown in FIG. 34, the side walls 104b and 304b of the lower and upper blocks 104 and 304 may have different heights. That is, in the description of the lower block 104, one side wall 104b is formed lower than the other side wall 104g. The difference between the side walls 104b (304b) and 104g (304g) is set to, for example, １ ／ of the height of the plate-shaped intermediate block 2 to be combined. The basic shape of the upper block 304 is the same as that of the lower block 104. The lower and upper blocks 104 and 304 are arranged so that the intermediate blocks 2 are staggered when viewed from the side, in other words, are alternately arranged in two steps. In this way, by setting the dividing positions of the blocks constituting the tubular concrete product U in a staggered arrangement, the PC steel member 5 for vertical tightening functions as a key member.
It is possible to suppress the vertical displacement between them.

Further, in the cylindrical concrete product U shown in the above embodiment and FIGS. 28 to 33, as shown in FIGS. And upper block 3,304
May be doubled. In addition, the configuration of each unit is not limited to the illustrated example, and various modifications can be made without departing from the spirit of the present invention.

That is, in the above embodiment, the tubular concrete product U is connected vertically by using PC steel to form the tubular concrete structure CP. However, the connection of the tubular concrete product U is at least And a connection plate attached to the lower blocks 3 and 1. In addition, the connecting surface 1 of the tubular concrete product U
For example, a concavo-convex engaging portion may be provided and connected to at least a part of 2. In addition, various methods known in the art can be applied to the connection of the tubular concrete product U.

[0043]

As described above, according to the present invention, a tubular concrete product is constructed by the upper block, the intermediate block and the lower block. Can also be constructed. In addition, since the PC steel material for upper and lower fastening is temporarily tensioned by the temporary tensioning means, the surfaces of the respective blocks can be easily aligned, and the joint accuracy of the joint surfaces of the respective blocks can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view of the tubular concrete product of the embodiment.

FIG. 3 is a partial cross-sectional front view of the tubular concrete product of the embodiment.

FIG. 4 is a sectional view showing an attached state of the guide steel material 13a of the embodiment.

FIG. 5 is a front view showing an attached state of the guide steel material 13a of the embodiment.

FIG. 6 is a sectional view showing an attached state of the guide steel material 13b of the embodiment.

FIG. 7 is a front view showing an attached state of the guide steel material 13b of the embodiment.

FIG. 8 is a sectional view showing a lower end portion of a PC steel material in a lower block of the embodiment.

FIG. 9 is a sectional view showing a connection portion of a PC steel material in the lower block and the intermediate block of the embodiment.

FIG. 10 is a sectional view showing a connecting portion of the PC steel material in the intermediate block and the upper block of the embodiment.

FIG. 11 is a sectional view showing the upper end of the PC steel material in the upper block of the embodiment.

FIG. 12 is a sectional view showing a fitted state of the guide key and the insert nut of the embodiment.

FIG. 13 is a front view showing a state where the lower block is installed in the construction of the embodiment.

FIG. 14 is a side view showing a state where the lower block is installed in the construction of the embodiment.

FIG. 15 is a plan view showing a state where the lower block is installed in the construction of the embodiment.

FIG. 16 is a front view showing a state where an intermediate block is installed in the construction of the embodiment.

FIG. 17 is a side view showing a state where an intermediate block is installed in the construction of the embodiment.

FIG. 18 is a front view showing a state where the upper block is installed in the construction of the embodiment.

FIG. 19 is a side view showing a state where the upper block is installed in the construction of the embodiment.

FIG. 20 is a plan view showing a state where an upper block is installed in the construction of the embodiment.

FIG. 21 is a front view showing a state where a hydraulic jack for pulling is mounted in the construction of the embodiment.

FIG. 22 is a side view showing a state where a hydraulic jack for pulling is attached in the construction of the embodiment.

FIG. 23 is a plan view showing a state where a hydraulic jack for pulling is attached in the construction of the embodiment.

FIG. 24 is a front view showing a state in which a hydraulic jack for fitting the connecting surfaces is mounted in the construction of the embodiment.

FIG. 25 is a side view showing a state in which a hydraulic jack for matching the connection names is mounted in the construction of the embodiment.

FIG. 26 is a front view showing the state of use of the assembly work vehicle in the embodiment.

FIG. 27 is a side view showing a use state of the assembly work vehicle in the embodiment.

FIG. 28 is a perspective view showing a cylindrical concrete product according to another embodiment of the present invention.

FIG. 29 is a perspective view showing a cylindrical concrete product according to a second other embodiment of the present invention.

FIG. 30 is a perspective view showing a cylindrical concrete product according to a third other embodiment of the present invention.

FIG. 31 is a perspective view showing a cylindrical concrete product according to a fourth other embodiment of the present invention.

FIG. 32 is a perspective view showing a cylindrical concrete product according to a fifth other embodiment of the present invention.

FIG. 33 is a perspective view showing a cylindrical concrete product according to a sixth other embodiment of the present invention.

FIG. 34 is a perspective view showing a cylindrical concrete product according to a seventh other embodiment of the present invention.

FIG. 35 is a side view of an eighth embodiment of the present invention.

FIG. 36 is a side view of a ninth other embodiment of the present invention.

[Explanation of symbols]

 PC: tubular concrete structure U: tubular concrete product 1: lower block 2: intermediate block 2c: concave portion 3: upper block 4: PC steel 5: PC steel 7: nut 9: fixing plate 11v: sheath hole

Claims (14)

[Claims] 1. A lower block made of concrete having an upper surface opening type in which a PC steel material is embedded, an upper block made of concrete having an lower surface opening type, and an intermediate block mounted on the lower block and having the upper block mounted thereon. A plurality of sheath holes for inserting a PC steel material for vertical tightening disposed in the wall of the upper block and the intermediate block; and a lower block provided in at least one opening of the sheath holes of the intermediate block. Temporary tension means for temporarily tensioning the PC steel material connected to the buried PC steel material and inserted into the sheath hole of the intermediate block, and temporarily moving the PC steel material with the intermediate block placed on the lower block. After being tensioned, the upper block is placed on the middle block, and the upper, middle and lower blocks are tightened up and down with PC steel material to build a tubular concrete product,
A tubular concrete structure, wherein a plurality of tubular concrete structures are connected. 2. The cylindrical shape according to claim 1, wherein the temporary tensioning means comprises a recess provided on at least one of the joining surfaces of the upper block and the lower block of the intermediate block for accommodating a fixing plate and a nut. Concrete structure. 3. The tubular concrete structure according to claim 2, wherein the recess is provided with a lateral through-hole that opens to a side wall surface of the intermediate block and allows the inside and the outside to communicate with each other. 4. The tubular concrete structure according to claim 1, wherein the upper, lower and intermediate blocks are provided with concave and convex engaging portions on respective joint surfaces. 5. The cylindrical shape according to claim 4, wherein the concave / convex engaging portion comprises an engaging concave portion provided on one of the opposed joining surfaces and an engaging projection provided on the other joining surface. Concrete structure. 6. The upper, lower and intermediate blocks are provided with an insert nut for attaching a guide member for aligning the side surfaces at least on the side surface serving as the inner surface of the tubular concrete product. The tubular concrete structure according to claim 1. 7. An insert nut for mounting a rigid body for vertically aligning the next constructed structure with the already constructed tubular concrete product by vertical tightening so as to align the connecting surface thereof, wherein the upper, lower and intermediate blocks are provided. The tubular concrete structure according to claim 1, 4 or 6, which is provided on a connecting surface. 8. The tubular concrete structure according to claim 1, wherein the lower block is provided with an insert nut for mounting a rail for an assembling trolley on an upper surface of the bottom plate. body. 9. A lower block and an upper block, wherein one wall is formed higher than the other wall, and intermediate blocks of adjacent tubular concrete products are alternately arranged in two stages. The tubular concrete structure according to claim 1, wherein 10. The tubular concrete structure according to claim 1, wherein the intermediate block is a flat block. 11. An intermediate block comprising: a horizontal plate portion;
2. The tubular concrete structure according to claim 1, further comprising side walls formed vertically at both ends of the flat plate. 12. The method for constructing a tubular concrete structure according to claim 1, wherein the lower block is arranged at a predetermined position.
The lower block and the intermediate block are surface-matched by the guide member in a state where the intermediate block is suspended above the lower block. The PC steel material penetrating through the block is temporarily tensioned, the upper block is suspended on the intermediate block, the intermediate block and the upper block are aligned by the guide member in a state where the upper block is suspended, and the intermediate block is The upper block is placed on the upper part, the PC steel material penetrating the upper block is connected to the pretensioned PC steel material, and then tensioned to construct a tubular concrete product. A method of constructing a tubular concrete structure, comprising connecting a tubular concrete product to form a tubular concrete structure. 13. At the time of connection, a rigid body is detachably attached to the connecting surface of the constructed tubular concrete product and brought into close contact with the already constructed tubular concrete product, so that the rigid body and the other tubular concrete product are connected. 13. The method for constructing a tubular concrete structure according to claim 12, wherein a tension is applied to the tubular concrete product by using a tension bar, and a connecting surface of the tubular concrete product to which a rigid body is attached is flush. 14. The method for constructing a tubular concrete structure according to claim 1, wherein a lower block of the tubular concrete product to be constructed next is connected to the tubular concrete product already constructed, and The lower block and the intermediate block are aligned by the guide member while the intermediate block is suspended, and the intermediate block is placed on the lower block and the lower block and the intermediate block are penetrated through the lower block when the alignment is completed. Temporarily tension the PC steel material, connect this intermediate block to the already constructed tubular concrete product, and perform surface matching between the intermediate block and the upper block with the guide member while suspending the upper block on the intermediate block, Place the upper block on the intermediate block in the state where the mating has been completed, After connecting the PC steel material that penetrates the upper block to the pre-tensioned PC steel material, it is tensioned to construct the next tubular concrete product, and by repeating these, a tubular concrete structure is constructed. Characteristic construction method of tubular concrete structure.