Method for constructing dam columns using precast components

Abstract

To easily realize construction using precast members even for large-sized structures.SOLUTION: At L1 to L6, PC members are provided spaced apart on both end sides in a longitudinal direction of a cross-sectional shape. Fig. 2(a) shows a cross section at L2, and Fig. 2(b) shows a cross section at L6, both of which are perpendicular to a vertical direction. PC members 11A and 11B are commonly used at L1 to L5, and a cross-sectional structure of Fig. 2(a) is the same at L1 and L3 to L5. At L1 to L5, the PC members 11A and 11B on an upper layer side are laminated on the PC members 11A and 11B on a lower layer side, respectively. PC members 12A and 12B of L6 are laminated on the PC members 11A and 11B of L5, respectively. A filling layer 20 is formed by placing concrete in a placing step to be described later.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a construction method for constructing large structures such as gate columns using precast members (precast concrete members: PC members). [Background technology]

[0002] The precast concrete (PC) method is known as a construction method for constructing structures such as residences. In the PC method, precast concrete blocks (precast members or PC members) that have been molded from concrete in advance at a location other than the construction site are brought to the site, and the structure is constructed by pouring concrete into a structure made by assembling these PC members on site. With this method, there is no need to cure the concrete on site. In addition, a large number of PC members can be produced with high precision and quality in an environment suitable for production at a location other than the construction site. This makes it possible to shorten the construction period and increase reliability.

[0003] Similarly, the PC well method is known, in which PC members are used to build large structures such as bridge pier foundations. In the PC well method, short cylindrical PC blocks are pressed in and sunk along the central axis to form a long cylindrical structure. At this time, the structure is tensioned with PC steel to impart compressive stress, which increases the strength of the completed structure. This method also offers the same benefits as above.

[0004] The characteristics of the PC method and the PC well method are greatly influenced by the configuration of the PC members used, and when the structure to be constructed is particularly large, PC members with a configuration appropriate to the size of the structure are used. Patent Document 1 describes a PC member that is formed as a two-piece structure and is connected and integrated with a connecting member. After the integrated PC members are further combined, the work can be carried out in the same way as before.

[0005] Furthermore, Patent Document 2 describes a technology for constructing large structures such as gate posts by forming an outer periphery by connecting a large number of smaller PC components using joints and pouring concrete into the area surrounded by the outer periphery. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2004-143785 A [Patent Document 2] JP 2019-060236 A Summary of the Invention [Problem to be solved by the invention]

[0007] For example, when applying the PC method to construct a large structure such as a dam column, a single PC member is particularly large and therefore not easy to transport. For this reason, even if a large structure such as a dam column is manufactured in sections as described in Patent Document 1, it is not easy to apply the PC method as described above.

[0008] On the other hand, when forming the outer periphery by connecting multiple small PC components as described in Patent Document 2, the total number of PC components used becomes large and the assembly work is not easy, so it is difficult to apply this construction method to large structures.

[0009] In addition, when actually constructing a structure, tensioning work is carried out to apply pretension (tension force) to each of the laminated PC members. However, when the structure is large and the number of laminated PC members is large, the number of tensioning work steps increases, and construction takes time.

[0010] For this reason, there was a demand for a construction method that would enable easy construction using precast components even for large structures.

[0011] The present invention has been made in consideration of the above problems, and an object of the present invention is to provide an invention that solves the above problems. [Means for solving the problem]

[0012] In order to solve the above problems, the present invention has the following configuration. The present invention uses precast members Weir pillar The construction method is to stack multiple precast members. Weir pillar Build Weir pillar a filler application step of providing a plurality of the precast members at a distance from one another in at least one layer of the laminated structure of the precast members, and applying a filler onto the precast members in the lower layer; a stacking step of stacking the precast members in the upper layer on the applied filler; and a pouring step of pouring concrete in a layer in which a plurality of the precast members are used in a single layer so as to bind the plurality of precast members, Weir pillar The present invention is characterized in that: The present invention uses precast members Weir pillar In the construction method of claim 1, the precast members used in a single layer are connected in the horizontal direction only by the concrete. The present invention uses precast members Weir pillar In the construction method of claim 1, the filler is mortar. The present invention uses precast members Weir pillar The construction method is characterized in that the 0-pressure flow value of the mortar in the JIS R5201 flow test is in the range of 200 to 280 mm. The present invention uses precast members Weir pillarThe construction method is characterized in that the precast members are stacked between multiple layers via the filler by repeatedly carrying out the filler application process and the stacking process, and after the filler has solidified, a tensioning operation is carried out to apply tension in the vertical direction to the stacked precast members. Effect of the Invention

[0013] Since the present invention is configured as described above, construction using precast members can be easily carried out even for large structures. [Brief description of the drawings]

[0014] [Figure 1] 1A is a side view and FIG. 1B is a front view of a dam pillar, which is a structure constructed by a construction method according to an embodiment of the present invention. [Diagram 2] 1 is a cross-sectional view perpendicular to the vertical direction at two locations of a dam pillar, which is a structure constructed by a construction method according to an embodiment of the present invention. FIG. [Diagram 3] 1 is an example of a flowchart of a construction method according to an embodiment of the present invention. [Figure 4] 1 is a side view of an intermediate step in a construction method according to an embodiment of the present invention. FIG. [Diagram 5] 1A is a cross-sectional view taken along a PC steel bar insertion hole (a) and a reinforcing bar insertion hole (b) of a laminate in an intermediate step of a construction method according to an embodiment of the present invention. FIG. [Figure 6] This is an example (part 1) of constructing dam columns of different cross-sectional shapes using a common end precast member in the construction method according to the embodiment of the present invention. [Figure 7] 10A-10C are cross-sectional views of examples of dam columns using various precast members in a construction method according to an embodiment of the present invention. [Figure 8] This is a second example of the construction method according to the embodiment of the present invention, in which dam columns of different cross-sectional shapes are constructed using a common end precast member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] A method for constructing a structure according to an embodiment of the present invention will be described. Here, it is assumed that the structure constructed by this construction method is a dam column as described in Patent Document 2. A dam column is a particularly large structure, and requires high strength. Furthermore, since multiple structures with almost the same structure are constructed, the PC construction method is particularly preferably used to shorten the construction period. On the other hand, the precast members (precast concrete members: PC members) used for this are large, and problems associated with large size may occur.

[0016] FIG. 1 shows the weir column 1 constructed here from two different sides, and FIG. 1(a) is a side view seen from a direction perpendicular to the water flow, with the right side being the upstream side. FIG. 1(b) is a front view seen from the upstream side along the water flow. This weir column 1 has a six-layer (L1-L6) laminated structure on a base plate B, and is characterized by the configuration of this six-layer laminated structure or its construction method. A top end portion T is provided on the weir column 1, and a gate post portion 2 smaller than the weir column 1 is provided on top of this. In reality, such structures are provided in parallel in a direction perpendicular to the water flow, and a door-like structure for adjusting the water flow is provided between adjacent weir columns 1 and gate post portions 2. For this reason, multiple structures shown in FIG. 1(b) are actually formed in parallel. The weir column 1 is particularly exposed to the water flow, so it is required to have strength to resist this water flow. However, these do not necessarily have the same shape (cross-sectional shape), and the shape may be set according to the position in the direction perpendicular to the water flow, for example. Note that the gate post part 2 is not directly related to the present invention, so its illustration is simplified in Figure 1.

[0017] In the layered structure of this dam pillar 1, two PC members (precast concrete members, precast members) are used for each of the layers L1 to L6. However, the two PC members used in each layer are arranged spaced apart on the left and right sides in the same layer as shown in Fig. 1(a), and each PC member constitutes part of the outermost periphery. The inside of the structure in which the PC members are layered, and the areas where the PC members are spaced apart, form a fill layer 20 made of concrete poured after the PC members are installed.

[0018] Here, in L1 to L6, PC members (end PC members) are provided at a distance from each other on both end sides in the long axis direction of the cross-sectional shape. FIG. 2(a) shows a cross section at L2 in the XX direction in FIG. 1(a), and FIG. 2(b) shows a cross section at L6 in the YY direction in FIG. 1(a), both of which are cross sections perpendicular to the vertical direction. PC members (end PC members) 11A and 11B are commonly used in L1 to L5, and the cross-sectional structure in FIG. 2(a) is the same for L1, L3 to L5. Here, the filling layer 20 constituting each layer is also shown, which is made of a material other than PC members. Here, in L1 to L5, the upper PC members 11A and 11B are laminated on the lower PC members 11A and 11B, respectively. Also, the PC members 12A and 12B of L6 are laminated on the PC members 11A and 11B of L5, respectively.

[0019] In Fig. 2, a large number of circular PC steel bar insertion holes 21 and reinforcing bar insertion holes 22 are arranged and formed to penetrate each PC member vertically. The PC steel bar insertion holes 21 and reinforcing bar insertion holes 22 are formed so as to overlap in a plan view at all of L1 to L6 when stacked. Therefore, the structure in Fig. 2(a) is formed continuously from L1 to L5, and the structure in Fig. 2(b) is also formed continuously from L6 to the structure in Fig. 2(a) at L5. The PC steel bar insertion holes 21 are used to insert PC steel bars in the tensioning work described later, and the reinforcing bar insertion holes 22 are used to insert reinforcing bars from L1 to L6 after all the PC members have been stacked. These will be described in detail later.

[0020] Although not shown in Fig. 1, a filler is provided between the vertically stacked PC members. Mortar is particularly preferably used as the filler. This will also be described later.

[0021] The fill layer 20 is formed in a casting process described later by placing the PC members and pouring concrete in a state where formwork is installed between the left and right PC members in each layer as shown in Fig. 2. The form shown in Figs. 1 and 2 is realized by removing the formwork after the concrete has solidified.

[0022] Fig. 3 is a flow chart for constructing the structure of Fig. 1 by this PC construction method. In Fig. 1, the structure has six layers L1 to L6, but in Fig. 3, the total number is generalized to any number (plural). Also, Fig. 4 is a side view showing the form of several steps when constructing the structure of Fig. 1(a) by this construction method.

[0023] Here, first, the bottom slab B, which is the structure of the lowest layer in Fig. 1, is formed (S1). Here, since the bottom slab B is made of concrete, the bottom slab B is formed by pouring concrete after forming a formwork, and the top surface side is formed to be flat. The bottom slab B may be formed using PC members in the same way as L1 etc. described later.

[0024] Next, a filler is applied onto the bottom slab B (S2: filler application step), and then the PC members are placed (S3). Here, PC members 11A and 11B are placed at L1 first. As described in Patent Document 1 and the like, epoxy adhesives and the like are generally used as fillers when laminating PC members, whereas mortar is particularly preferably used for laminating PC members for large structures such as those used here.

[0025] In general, the fluidity of epoxy adhesives and mortar is different, and epoxy adhesives are usually used by coating because they have low fluidity (high viscosity). In order to use mortar as a filler by coating it as described above, it is preferable to set the fluidity of the mortar to a zero-stroke flow value in the JIS R5201 flow test in the range of 200 to 280 mm.

[0026] This process is repeated a predetermined number of layers (stages) (S4), and the predetermined number of stages is assumed to be three here. That is, filler is applied to the upper surfaces of the PC members 11A and 11B of L1 after installation, and then the PC members 11A and 11B of L2 are arranged, and the filler is solidified (S2-S3: lamination process), and then filler is applied to the upper surfaces of the PC members 11A and 11B of L2 after installation, and then the PC members 11A and 11B of L3 are arranged, and the filler is solidified (S2-S3: lamination process). As a result, a structure in which the PC members 11A and 11B of L1 to L3 in FIG. 1 are laminated is formed (S4: Yes). FIG. 4(a) is a side view corresponding to FIG. 1(a) in this state. Here, the description of the filler is omitted.

[0027] Here, the solidified state of the filler (mortar) is the state where the design standard strength of the PC member (for example, the strength at one day of age at 5°C is 2.5 N / mm 2 ) according to the strength (for example, 2.5N / mm 2 Alternatively, since the tensioning operation described below is performed in a state in which the filler has solidified, the strength may be determined based on the tension applied by the tensioning operation.

[0028] As described above, the PC members 11A and 11B are used in common in L1 to L3, so the PC steel bar insertion holes 21 and the reinforcing bar insertion holes 22 in FIG. 2(a) are connected to L1 to L3. In the above, after the filler between the PC members 11A and 11B of L1 and the PC members 11A and 11B of L2 solidifies, new filler is applied on the PC members 11A and 11B of L2, and the PC members 11A and 11B of L3 are stacked. In other words, after the filler on the lower layer solidifies, the filler on the upper layer is newly applied and the PC members are newly stacked. However, as long as the tensioning work (S5) described later is performed in a state where the filler has solidified and has sufficient strength, new filler may be applied on the upper layer and new PC members may be stacked before the filler on the lower layer hardens.

[0029] With the PC members 11A, 11B of L1 to L3 stacked and arranged in this manner, PC steel rods are inserted into the PC steel rod insertion holes 21 so as to penetrate them vertically, and then a tensioning operation is carried out (S5) in which tension (compressive stress) is applied to the PC members 11A, 11B of L1 to L3 in the up-down direction (stacking direction) via the PC steel rods. Figure 4(b) is a side view showing this configuration as a schematic. This tensioning operation and the structure related thereto will be described later.

[0030] The tensioning operation (S5) is carried out after the filler used in stacking at this point has solidified, and the PC members are not pressurized before this solidification. If pressure was applied before the filler solidified, the PC members 11A, 11B and the base plate B, or the PC members 11A and 11B in adjacent layers would come into direct contact with each other, and there would be areas between them where no filler is present. However, by not applying pressure, a layer made of filler can be formed throughout the spaces between them, and the PC members 11A, 11B are fixed in place as this layer solidifies. This prevents cracks from occurring in the PC members in subsequent processes, even if the PC members 11A, 11B are large.

[0031] After the tensioning work (S5) as described above is completed, formwork is installed (S6) and concrete is poured (S7: pouring step) to form the infill layer 20A, which is the infill layer corresponding to L1 to L3. Here, the formwork is continuously formed from L1 to L3 in accordance with the shape of the infill layer 20 between the PC members 11A and 11B in Fig. 2(a). After the concrete has solidified, the formwork is removed (S8), thereby forming the structure of Fig. 2(a) from L1 to L3. Fig. 4(c) is a side view showing this form.

[0032] The above-mentioned steps of applying the filler (S2), arranging the PC members (S3), tensioning (S5), pouring concrete (S7), and removing the formwork (S8) are repeated until all layers are formed (S9). In the configuration of FIG. 1, the remaining three layers L4 to L6 are subjected to the same operations as those for L1 to L3 (S9). FIGS. 4(d), (e), and (f) are side views respectively showing the state after L4 to L6 are stacked (S3), the subsequent tensioning (S5), and the formation of the fill layer 20B from L4 to L6 by pouring concrete (S7). In this state, the reinforcing bar insertion holes 22 are connected from L1 to L6.

[0033] Thereafter, as shown in Fig. 4(g), reinforcing bars 100 are inserted into reinforcing bar insertion holes 21 that communicate from L1 to L6 (S10), and then grout is injected into reinforcing bar insertion holes 22 (S11). At this time, grout is also injected into PC steel bar insertion holes 21 (S11), and the grout then solidifies to complete the weir column 1. Thereafter, the top end portion T and the gate column portion 2 are constructed as shown in Fig. 1 (S12).

[0034] The structure relating to the tensioning work (S5) and the insertion of the reinforcing bar 100 (S10) in the above process will be specifically described. Fig. 5(a) is a detailed vertical cross-sectional view (corresponding to Fig. 4(e)) along the PC steel bar insertion hole 21 at the location where the PC members 11A, 12A are stacked during the tensioning work from L4 to L6. Here, the PC steel bar 30 (PC steel bar 30B) is inserted into the PC steel bar insertion hole 21 formed continuously from L4 to L6 as described above. Also, since the tensioning work from L1 to L3 has already been performed at this stage, the PC steel bar 30 (PC steel bar 30A) is also provided in the PC member 11A at L3, and the situation on the upper side of the PC member 11A at L3 is similar to the situation on the upper side of the PC member 12A at L6.

[0035] Fig. 5(a) shows the upper side of the PC member 12A at L6, the lower side of the PC member 11A at L4, and the upper side of the PC member 11A at L3 when tensioning work (S5) is performed from L4 to L6. As described above, a filler is provided between the PC members in the vertical direction, so that a thin bonding layer 40 made of solidified filler is formed between the PC member 11A at L4 and the PC member 11A at L3 in Fig. 5(a). The bonding layer 40 is similarly formed between the other layers.

[0036] Since the tensioning work at L1 to L3 and the tensioning work at L4 to L6 are performed separately, the PC steel rod 30B which is the PC steel rod 30 penetrating the PC member 12A at L6 and the PC member 11A at L4, and the PC steel rod 30A which is the PC steel rod 30 penetrating the PC member 11A at L3 are separate bodies. The lower end side of the lower PC steel rod 30A is fixed in the base slab B in Fig. 4(e) outside the illustrated range.

[0037] The PC steel rods 30 (30A, 30B) are threaded, and the nuts 31 are screwed onto the PC steel rods 30 so that they can be attached from above. The top surface of the PC members (PC member 12A at L6 and PC member 11A at L3 in FIG. 5(a)) that are the upper side during tensioning work is provided with an anchor plate 32, which is a horizontally extending metal plate through which the PC steel rods 30 penetrate, and the top surface of each PC member is provided with a recess 32A dug in such a way that the anchor plate 32 does not protrude from the top surface of the PC member when housed inside, around the PC steel rod insertion hole 21. The recess 32A may also be provided in other PC members (PC members at L1, L2, L4, and L5). In this case, the nuts 31 and anchor plates 32 are not used in these PC members as in the PC members at L3 and L6, but a PC member with a common structure can be used for L1 to L3, for example.

[0038] Therefore, the form shown in Fig. 5(a) is realized by attaching the nut 31 to the PC steel bars 30A and 30B on the upper side of the anchor plate 32. At this time, the coupler 33, whose inner surface is threaded like the nut 31, is attached to the upper end of the PC steel bar 30A and the lower end of the PC steel bar 30B, so that the PC steel bar 30A and the PC steel bar 30B are joined and integrated. Therefore, by tightening the upper nut 31 in Fig. 5(a), compressive stress can be applied in the vertical direction to the PC members 11A and 12A of L4 to L6 via the PC steel bar 30B. As described above, since the lower end side of the lower PC steel bar 30A is fixed in the base plate B outside the illustrated range, compressive stress is similarly applied in the vertical direction to the PC members 11A of L1 to L3 by tightening the lower nut 31 in the tensioning work (S5) before this stage. In FIG. 2, a single PC member 11A, 11B, 12A, 12B has a plurality of PC steel bar insertion holes 21, and this operation can be performed for each of the PC steel bar insertion holes 21, thereby performing tensioning over the entire PC member and applying a uniform compressive stress. This compressive stress is 0.5 to 1.0 N / mm 2 It can be about that.

[0039] 5(b) is a cross-sectional view similar to FIG. 5(a) of a location where the reinforcing bar insertion hole 22 is located after the reinforcing bar 100 is inserted (S10). As shown in FIG. 4(g) (S10), the reinforcing bar 100 penetrates L1 to L6, so in FIG. 5(b), a single reinforcing bar 100 is present in the reinforcing bar insertion hole 22 throughout the entire vertical direction. As in the case of the PC steel bar insertion hole 21, the situation in FIG. 5(b) is also realized in each of the reinforcing bar insertion holes 22.

[0040] 5(a) and 5(b), the PC steel bar insertion hole 21 and the reinforcing bar insertion hole 22 are formed with grout injection holes 23, which are small holes that connect them to the outside on the side of the PC member. Therefore, after the reinforcing bar 100 is inserted (S10), liquid grout with high fluidity is injected (S11) from the grout injection holes 23 into the PC steel bar insertion hole 21 with the PC steel bar 30 provided therein and the reinforcing bar insertion hole 22 with the reinforcing bar 100 provided therein, thereby filling the insides with grout and then solidifying the grout. As a result, tension is applied to L1 to L3 and L4 to L6, respectively, and the dam column 1 reinforced by the reinforcing bar 100 is obtained.

[0041] In the above, the stacking process (S2, S3) is carried out continuously for three layers (L1 to L3, L4 to L6) followed by the tensioning and pouring processes (S5 to S8). However, it is clear that the tensioning and pouring processes can be carried out in the same manner for other numbers of layers (including every other layer).

[0042] In the above construction method, two separate PC members (PC members 11A, 11B and PC members 12A, 12B) were used in each layer. These PC members are fixed by pouring concrete to form the fill layer 20, so there is no need to connect these two PC members using other members (connecting members) as in the techniques described in Patent Documents 1 and 2. In this case, although the weir column 1 is a large structure, the two PC members are smaller than the weir column 1, as they only form part of its periphery. For this reason, the PC members are easy to manufacture and transport, just like PC members in conventional PC construction methods.

[0043] However, in the above example, two PC members were used in every layer, but as long as lamination is possible in the same manner as above, it is not necessary to use two (multiple) PC members in every layer. In other words, the number of PC members provided in each layer does not need to be the same (multiple), and it is possible to build a structure in the same way if multiple PC members are provided in at least one layer in the laminate structure.

[0044] On the other hand, by providing the PC members corresponding to only a part of the periphery in this way, structures of different sizes can be constructed using the same PC members. Figures 6(a) and 6(b) show an example in which a structure of a different size from that in Figure 2 is constructed using the PC members 11A and 11B in Figure 2. Here, the PC steel bar insertion holes 21 and the reinforcing bar insertion holes 22 are omitted. In Figure 6(a), a structure (dam pillar) with a smaller width than that in Figure 2 is constructed by making the distance between the PC members 11A and 11B smaller than that in Figure 2, and in Figure 6(b), a structure (dam pillar) with a larger width than that in Figure 2 is constructed by making this distance larger than that in Figure 2.

[0045] As mentioned above, generally, multiple dam pillars are installed in parallel, and the structure in Fig. 1 is provided for each of them, but in this case, the size of the dam pillars (width along the flow direction) may be changed depending on the distance from the river bank, for example. Even in such cases, the above construction method makes it possible to use the same PC members for all the dam pillars, which reduces construction costs.

[0046] In the above example, PC members (end PC members) 11A, 12A, 11B, and 12B are provided on both ends of the long diameter direction in a cross section perpendicular to the vertical direction (stacking direction of the PC members) of the structure (dam column 1). However, other examples of setting the PC members according to this cross-sectional shape are also possible.

[0047] Figures 7(a)-(l) are cross-sectional views showing the structure of such a modified example in correspondence with Figure 2(a). Here, the PC steel bar insertion holes 21 and reinforcing bar insertion holes 22 are omitted. In the example of Figure 7, as in the case of Figure 2, PC members (end PC members) are provided on both ends in the major axis direction, but intermediate PC members that form part of the outer periphery on both ends in the minor axis direction are also used between these.

[0048] In Fig. 7(a)-(d), PC members (end PC members) 51A, 51B smaller than the PC members 11A, 11B are provided at both the left and right ends. In Fig. 7(a), large flat intermediate PC members 52A, 52B are provided at the top and bottom in the figure (left and right in the actual flow direction at the weir column), and in Fig. 7(b), smaller flat intermediate PC members 53A, 53B are provided at the top and bottom in the figure. In this case, the shape of the infill layer 20 in Fig. 7(b) can be realized by the formwork between the PC member 51B and the intermediate PC members 53A, 53B. In Fig. 7(c) and (d), four intermediate PC members 54A-54D and 55A-55D are used, respectively. Even when more than two intermediate PC members are used in this way, it is preferable to provide them symmetrically at both ends in the short diameter direction if the structure has a cross-sectional shape that is symmetric at both ends in the short diameter direction.

[0049] 7(e)-(h) show a configuration in which the left PC member (end PC member) 51A in Fig. 7(a)-(d) is divided into two, that is, PC members (end PC member) 51A1 and 51A2 at the top and bottom in the figure, and the right PC member (end PC member) 51B is divided into two, that is, PC members (end PC member) 51B1 and 51B2 at the top and bottom in the figure. Here, the PC members 51A1 and 51A2, and the PC members 51B1 and 51B2 are in contact with each other. As described above, in the example of Fig. 2, the PC members used in one layer are separated and spaced apart (for example, no connecting member for connection is used), but when more than two PC members are used like this, some of the PC members may be in contact with each other or connected, and it is not necessary to space all the PC members apart.

[0050] Figures 7(i) to (l) differ from Figures 7(e) to (h) in that the left PC member (end PC member) 51A in Figures 7(a) to (d) is divided into two, with PC members (end PC member) 51A3 and 51A4 at the top and bottom of the figure, and the right PC member (end PC member) 51B being divided into two, with PC members 51A3 and 51A4 at the top and bottom of the figure, and PC member 51B3 and PC member 51B4 being separated from each other, and PC member 51A3 and PC member 51A4, and PC member 51B3 and PC member 51B4 being separated from each other.

[0051] Figures 8(a) and (b) show examples in which structures with different cross-sectional shapes are constructed using the same PC members as in Figure 7(i) (PC members 51A3, 51A4, 51B3, 51B4, intermediate PC members 52A, 52B), by making the distances between PC members 51A3 and 51A4, and between PC members 51B3 and 51B4 zero in Figure 8(a), and by making these distances larger in Figure 8(b) than in Figure 7(i). In other words, as in the case of Figure 6, even when more than two PC members are used in one story, structures with different cross-sectional shapes can be constructed using the same PC members. In Figure 8, PC members (end PC members) 51A3, 51A4, 51B3, 51B4 and intermediate PC members 52A, 52B are used in both the case of Figure 8(a) and the case of Figure 8(b), but depending on the situation, it is possible to construct dam columns with different cross-sectional shapes by not using the intermediate PC members 52A, 52B or by using other intermediate PC members in Figure 7 instead. As mentioned above, this point is particularly effective for dam columns constructed in parallel in multiple units.

[0052] As shown in Fig. 7, it is preferable to use end PC members at both ends in the long axis direction of the cross section, and intermediate PC members at both ends in the short axis direction. In this case, since the distance between the end PC members increases along the long axis direction, it is possible to provide two or more sets of intermediate PC members, as shown in Fig. 7(c) etc. However, even for structures having a cross-sectional shape in which the long axis direction and the short axis direction cannot be clearly distinguished in this way, it is possible to appropriately set PC members each constituting part of the outer periphery, and it is clear that the same effect as above can be obtained.

[0053] In addition, in Figures 6 to 8, the left and right end PC members are configured to be spaced apart. However, they may be abutted together without using fasteners, etc. For example, in Figure 6, the left and right end PC members 11A, 11B are abutted together without providing a gap between them, thereby obtaining a structure with the narrowest width.

[0054] In addition, as described above, by using mortar as the filler (bonding layer 40), as shown in Figs. 4(b)(e) and 5(a), tensioning work can be performed between multiple layers at once, and even if the total number of layers is large, construction can be simplified and the construction period can be shortened. In the above example, the above effect can be obtained if each layer in the laminated structure is composed of two PC members and multiple PC members are provided in at least one layer as described above, but the effect of using mortar as the filler in this way is unrelated to the use of multiple PC members in one layer. In other words, even if all layers are composed of a single PC member, the construction period can be shortened by using mortar as the filler. This effect is particularly noticeable when the structure is large and the total number of layers is large.

[0055] The present invention has been described above based on the embodiment. This embodiment is merely an example, and it will be understood by those skilled in the art that various modifications are possible in the combination of the respective components, and that such modifications are also within the scope of the present invention. [Explanation of symbols]

[0056] 1 Weir pillar (structure) 2. Gatepost 11A, 11B, 12A, 12B, 51A, 51B, 51A1-51A4, 51B1-51B4 PC members (end PC members, end precast members) 52A, 52B, 53A, 53B, 54A~54D, 55A~55D PC members (intermediate PC members, intermediate precast members) 20, 20A, 20B filling layer 21 PC steel rod insertion hole 22 Reinforced concrete hole 23 Grout injection hole 30, 30A, 30B PC steel bar 31 Nut 32 Anchor plate 32A Recess 33 Coupler 40 Bonding layer 100 Steel Bars B Bottom version T Top end

Claims

1. A method for constructing a dam column by stacking a plurality of precast members, comprising the steps of: providing a plurality of the precast members spaced apart from one another in at least one layer of the laminated structure of the precast members; a filler application step of applying a filler onto the precast member on the lower layer side; A lamination process of laminating the precast members on the upper layer side on the applied filler; A pouring step of pouring concrete in a layer in which a plurality of the precast members are used in a single layer so as to bond the plurality of the precast members; Including, A method for constructing dam columns using precast members, characterized in that the precast members used in a single layer are each common to all of the members, and multiple dam columns of different sizes are constructed by changing the spacing between the precast members.

2. 2. The method for constructing a dam pillar using precast members according to claim 1, wherein the precast members used in a single layer are connected in the horizontal direction only by the concrete.

3. 3. The method for constructing a dam pillar using precast members according to claim 1 or 2, characterized in that the filler is mortar.

4. The method for constructing a dam column using precast members according to claim 3, characterized in that the zero-pressure flow value of the mortar in the JIS R5201 flow test is in the range of 200 to 280 mm.

5. The filler application step and the lamination step are repeated to laminate the precast members between a plurality of layers via the filler, A method for constructing a dam column using precast members, as described in claim 3 or 4, characterized in that after the filler has solidified, a tensioning operation is performed to apply tension in the vertical direction to the stacked precast members.

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