JP4126474B2 - Concrete dome roof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a concrete dome roof that covers an upper part of a structure such as a storage tank for storing various stored items such as liquid, low-temperature liquefied gas, powder, and granular materials.
[0002]
[Prior art]
Conventionally, a concrete concrete dome roof and its construction method are as follows: a center frame is temporarily installed in the center of a structure such as a storage tank, a total scaffolding is assembled throughout, and a total formwork is formed into a dome roof shape using wood or plywood. After carrying out temporary construction to support this formwork with a support, a concrete dome roof was constructed by placing reinforced concrete uniformly over the entire roof of the formwork.
[0003]
Also, as another concrete dome roof and its construction method, a concrete segment with a shape divided into a plurality of dome roofs is manufactured in advance using a formwork near the site of a factory or a structure such as a storage tank, This segment was lifted with a hoist, etc., and further supported by a center frame and scaffolding from the lower part of the storage tank, and evenly connected across the entire roof to construct a concrete dome roof.
[0004]
[Problems to be solved by the invention]
A conventional concrete dome roof and its construction method, that is, using a temporary member such as a center frame, a total scaffold, a total formwork, and a support construction, the method of uniformly constructing the entire roof is in accordance with the shape of the dome roof. It is difficult and time-consuming to manufacture the formwork, and the temporary construction of scaffolding and support work is complicated, and the number of man-hours and temporary construction costs are huge. There were problems such as.
[0005]
In addition, the dome roof using concrete segments and its construction method requires a heavy hoist, etc. that lifts heavy segments over a wide area at high locations and moves over a wide range, and supports the segments evenly throughout the roof. In some cases, a large-scale center frame or scaffolding is required, and temporary work for assembling and connecting is still difficult.
[0006]
The present invention has been made in view of the above-described problems of the prior art. The roof is formed into a connecting structure with excellent strength, and is easy to assemble and construct on site, and is economically constructed with high work efficiency. A concrete dome roof that can be used.
[0007]
[Means for Solving the Problems]
A concrete dome roof according to the present invention is a concrete dome roof that covers an upper portion of a side wall of a structure such as a storage tank, and is opposed to the concrete dome roof from the upper end of one of the side walls through the center of the roof. At least one rigid arch is formed by connecting concrete segments , which are formed by tightly bonding a lining steel plate to the lower surface of the other side wall at the upper end of the side wall and welding together in the center direction. The remaining roof portion excluding the arch is formed by a concrete covering member that fills the space between the arch and the upper end of the side wall.
[0009]
The concrete dome roof of the present invention is a concrete dome roof that covers the upper part of the side wall of a structure such as a storage tank, and the concrete dome roof is formed by tightly bonding a lining steel plate to the lower surface and welding it together. The concrete segments are connected to each other along the circumferential direction to form an annular ring, and the annular part is formed by sequentially connecting the ring from the upper end of the side wall toward the center of the roof, and the innermost part of the annular part. The entire roof is formed by the zenith filling the center of the ring.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Based on FIG. 1 thru | or FIG. 6, the example embodiment of the concrete dome roof and its construction method concerning this invention is demonstrated.
[0014]
FIG. 1 and FIG. 2 show a flat circular dome roof 1 covering an upper portion of a side wall 2 in a structure such as a bottomed cylindrical storage tank, and this dome roof 1 has one self-supporting rigid arch 8 at its center. A plan view of an embodiment in which the entire dome roof 1 is constructed by constructing the entire dome roof 1 by using the arch 8 to fill the remaining roof portion is shown.
[0015]
FIG. 1 shows a situation in which a substantially fan-shaped arch 8A is installed and formed. The curved portion which is a constituent member of the dome roof 1 from the side wall upper ends 3, 3 facing each other across the storage tank center toward the storage tank center. The substantially trapezoidal concrete segments 5A, 5B,... Are sequentially connected along the dome shape as shown by the arrows in the figure, and sequentially supported while the cantilever is supported by this strong connection. Continue construction. Then, both ends of the segments 5 are connected and integrated at the curved disk-shaped zenith portion 4 and are formed so as to form a substantially fan-shaped arch 8A having a rigid strength in a self-standing state along the dome shape.
[0016]
Further, the PC steel material 6 is inserted into the connected and integrated arch 8A to give a tension, and fastened by the fixing portions 7 and 7 of the opposite side wall upper end portion 3 to improve the strength. The PC steel material 6 is provided continuously between the fixing portions 7 and 7 so as to intersect at the center of the zenith portion 4, or the fixing portions 7 and 7 are arranged in parallel near the center of the zenith portion 4. A strong structure along the dome shape in either case, provided continuously between them, or opened on the zenith portion 4 and provided with a fastening portion and provided in the radius between the fixing portion 7 and the fastening portion. The PC steel material 6 is tensioned and fastened so that the substantially fan-shaped arch 8A is formed.
[0017]
Next, the roof portion of the remaining space uses this arch 8A and is not shown in the figure. However, for example, by suspending a wire or the like so as to support the load of the segment 5, it is orthogonal to the arch 8A or on the arch 8A. Construction is carried out as if the space between the arch 8A and the side wall upper end portion 3 is filled with the covering member so as to widen along. Although not shown in the figure, for example, the covering members 5A, 5B,... Can be supported in a cantilevered manner along the dome shape sequentially from the side wall upper end portion 3 to the zenith portion 4 as described above. Construction is carried out while projecting, or a covering member made of a narrow concrete curved plate is passed between the arch 8A and the side wall upper end 3, or a covering member made of a wide concrete curved plate is placed on the arch 8A. The entire dome roof 1 is constructed by covering the entire space between the upper end 3 and the side wall 3 so as to fill the remaining space.
[0018]
When the above-described substantially fan-shaped arch 8A is constructed by erection, the width of the connecting portion between the segment 5A and the upper end portion 3 of the side wall is wide, and the width becomes narrower toward the central zenith portion 4, and the load is increased. Therefore, the cantilever support of the segment 5 is facilitated, so that the stability when the arch 8A is installed is improved and the safety of the work is improved. Further, the roof portion of the remaining space that fills the space between the arch 8A and the side wall upper end portion 3 can use a thin and lightweight concrete covering member.
[0019]
FIG. 2 shows a state in which a substantially band-shaped arch 8B is formed, which is a constituent member of the dome roof 1 from the side wall upper ends 3, 3 facing each other across the storage tank center toward the storage tank center. Connect the curved rectangular segments 5A, 5B,... In sequence as shown by the arrows in the figure while projecting along the dome. Go. Then, the distal ends of the segments 5 are connected and integrated at the zenith portion 4 having a curved substantially rectangular plate shape, and are erected so as to form a substantially band-shaped rigid-strength arch 8B that is self-standing along the dome shape.
[0020]
Further, the PC steel material 6 is inserted in parallel in the connected and integrated arch 8B as shown in the figure, or is inserted so as to intersect at the center so as to pass through the center of the roof (not shown). The steel material 6 is tensioned and fastened at the fixing portions 7 and 7 of the opposite side wall upper end portion 3 to form an arch 8B having higher strength.
[0021]
Next, the roof portion of the remaining space uses this substantially band-shaped arch 8B, and although not shown in the figure, for example, by suspending a wire or the like so as to support a load, or in a direction orthogonal to the arch 8B or the arch 8B. So that the space between the arch 8B and the side wall upper end portion 3 is filled with the covering member. Although not shown in the figure, for example, the covering members 5A, 5B,... Can be supported in a cantilevered manner along the dome shape sequentially from the side wall upper end portion 3 to the zenith portion 4 as described above. Construction is performed while projecting, or a narrow concrete covering member is passed between the arch 8B and the upper end 3 of the side wall, or a wide concrete covering member is covered between the arch 8B and the upper end 3 of the side wall. Thus, construction is performed so as to fill the remaining space, and the integrated dome roof 1 is constructed.
[0022]
In the case of constructing the arch 8B having a substantially band shape as described above, since the arch 8B has a wide and strong structure throughout, the remaining portion of the dome roof 1 is constructed using the arch 8B. In this case, it is easy to support the load of the covering member and the safety is further improved, and the roof portion 1 of the remaining space that fills the space between the arch 8B and the upper end portion 3 of the side wall uses a thin and lightweight concrete covering member. can do.
[0023]
1 and 2 show the case where a single arch 8 passing through the center of the dome roof 1 is constructed, but a plurality of arches 8 are also provided in the 90-degree direction, the 45-degree direction, and the like. You may make it carry out construction. As described above, when a plurality of arches 8 are installed, the strength of the dome roof 1 can be increased, the load at the time of roof construction can be dispersed, and the construction work can be performed on average.
[0024]
FIG. 3 shows an embodiment of a concrete dome roof according to the present invention, in which an annular ring 10 is connected and formed, and an annular portion is formed while sequentially connecting such annular rings 10 toward the center of the roof. And the case where the zenith part 11 which fills the center of the innermost ring 10 of this annular part is provided, and the integral dome roof 1 is constructed | assembled is shown. As shown in FIG. 3, the dome roof 1 includes a substantially trapezoidal and identically shaped concrete segment 9 </ b> A that is curved from the side wall upper end 3 on the outer periphery of the roof along the left and right circumferential directions as indicated by arrows in the figure. 9A,... Are projected along the dome shape, sequentially connected while cantilevering the load of the segment 9A, and annularly integrated over the outer periphery of the roof to form a ring 10A that is cantilevered with a predetermined width. . Next, in the same manner as above, the segments 9B, 9B,... Are protruded and sequentially connected in the circumferential direction to form an annular ring 10B. In this way, the annular rings 10A, 10B,... Are sequentially assembled from the inner periphery of the side wall upper end portion 3 toward the center of the roof while assembling and forming the annular portion while maintaining the load balance while averaging. An integral dome roof 1 is constructed by constructing and filling a curved disk-like zenith 11 at the center of the innermost ring 10.
[0025]
Each ring 10 thus annularly integrated is resistant to bending loads, and thus can be easily made independent without necessarily placing a PC steel material in the segment 9. Moreover, the dome roof 1 which consists of the cyclic | annular part which connected the ring 10 toward inner side, and the zenith part provided in the center becomes an integral structure excellent in rigidity.
[0026]
Based on FIG. 4, the embodiment example of the segment 5 used as the member which comprises the said concrete dome roof 1 is explained in full detail. This segment 5 is manufactured into a curved, substantially trapezoidal reinforced concrete structure using a mold having a predetermined shape in accordance with the curvature of the dome roof 1 in the vicinity of a factory or a storage tank site to be constructed in advance. In order to connect the segments 5 to each other, the segment 5 is provided with a connection fitting 12A in the longitudinal direction and a connection fitting 12B in the circumferential direction. The embodiment of the segment 5 shown in FIG. 4 is for constructing a dome roof made of concrete by providing a PC steel material 6 as shown in FIGS. 1 and 2 and erected an arch 8 of a prestressed concrete structure. The case where the PC sheath 13 for inserting the PC steel material 6 in the warp direction and the connection tool 14 are provided is shown. In addition, although the PC steel material 6 is not provided in the dome roof 1 formed by forming the annular ring 10 shown in FIG. 3, if the PC steel material 6 is disposed in the radial direction or the circumferential direction, the rigidity is further increased. . The segment 9 forming the annular ring 10 shown in FIG. 3 is manufactured into a substantially rectangular reinforced concrete structure having a curved shape and matching the dome roof shape and having the same shape in the circumferential direction.
[0027]
FIG. 5 shows the vicinity of the upper end portion 3 of the side wall and shows the installation state of the temporary lifting device 15 used for constructing the dome roof 1 covering the upper portion. As shown in FIG. 5, the side wall upper end 3 is formed in a ring beam having an increased wall thickness on at least one of the inner side and the outer side in the horizontal direction, and the segment 5 </ b> A located at the outermost peripheral part of the dome roof 1. The case where the inner peripheral side is formed obliquely in accordance with the inclination angle of the dome roof so as to be fitted and supported by the peripheral edge portion is shown. Further, in the case where the arches 8A and 8B as shown in FIGS. 1 and 2 are erected and formed, the PC sheath 13 is embedded in the ring beam so that the PC steel material 6 is inserted and tightened, and the outer periphery of the PC sheath 13 is embedded. A fixing portion 7 is provided by opening the side end portion.
[0028]
Based on FIG. 5, the embodiment example of the temporary lifting apparatus 15 used for construction | assembly of the said dome roof 1 is explained in full detail. The lifting device 15 is arranged to support the load of the segment 5 and to perform the connection and connection work thereof, and is formed in a temporary structure that can be freely attached to and detached from an anchor bolt or the like provided on the upper end portion 3 of the side wall. . The temporary lifting device 15 includes a column 16 erected vertically, a pulley 17 provided at an upper end thereof, a wire 18 suspended on the pulley 17, and one end of the wire 18 engaged with the segment 5. The hoist 20 is formed from a hoist 19 and a hoist 19 that winds up the other end of the wire 18. In addition, the segment 5 is provided with a plurality of connection fittings 12 which are used for connecting the segments 5 to each other, and further used for engaging the hanging tool 20. In addition, in the state where the segment 5 is connected and fixed with the connection fitting 12 and is self-supported so that the load can be sufficiently supported, the hanging tool 20 is detached from the connection fitting 12 and is replaced with the connection fitting 12 of the next segment 5. The lifting support and connection work can be performed.
[0029]
Further, as shown in FIG. 3, even when the segment 9 is constructed along the circumferential direction, a temporary lifting device 15 as shown in FIG. 5 is used, and as shown in FIG. A plurality of lifting devices 15 are arranged at predetermined intervals along the segment 9 and the segments 9 are connected in a load-supporting state by self-supporting, and then the lifting devices 15 are sequentially moved along the circumferential direction. continue.
[0030]
Based on FIG. 6, an embodiment in the case where the lining steel plate 22 is integrally formed on the lower surface of the segment 21 that constructs the concrete dome roof will be described. The lining steel plate 22 is formed into a substantially trapezoidal plate having a predetermined size that is curved in accordance with the curvature of the dome roof, and a reinforcing material (not shown) that suppresses the deflection of the plate is provided on the lower surface thereof, at a predetermined position on the upper surface. A plurality of connecting bolts 24 are erected at predetermined intervals. This curved substantially trapezoidal lining steel plate 22 is a segment that is arranged along the dome shape while engaging the lifting tool 20 of the lifting device 15 and supporting the load, and rides on the upper end portion 3 of the side wall or extends over it. Riding on 21, the position of the adjacent lining steel plate 22 is aligned, and the end edges thereof are hermetically coupled by welding at the welded portion 23. In the segment 21 to be constructed on the lining steel plate 22, a connection opening 26 is provided at a position corresponding to the connection bolt 24 so as to be in close contact with the lining steel plate 22. After the lining steel plate 22 is connected, the lifting device 15 is used to place the connection bolt 24 and the connection opening 26 on the lining steel plate 22 while suspending and supporting the segment 21, and the upper portion thereof. Then, the connecting nut 24 is fastened to the connecting bolt 24 to firmly fix the segment 21 and the lining steel plate 22 to each other.
[0031]
The connecting bolt insertion hole provided in the connecting opening 26 of the segment 21 is formed as an elongated hole that can be adjusted as a movement allowance for tightening when the segments 21 are connected to each other, and connects the connection fittings 12 of the segments 21 and 21 to each other. After tightening, the connection nut 25 is attached to the connection bolt 24 inserted through the connection bolt insertion hole. Further, when the PC steel material 6 is inserted and tightened in the diameter direction or the like, the connection fittings 12 are connected to each other after the tension fastening of the PC steel material 6 is completed, and finally the connection nut 25 is attached to the connection bolt 24.
[0032]
Although not shown in the drawing, a lining steel plate with a peripheral edge extending in a frame shape is formed in advance on the lower surface of the segment, and the peripheral edges of the lining steel plate extending from this segment are connected by welding. Also good. In this case, the reinforcing bars protruding from the segments are connected between the segments, and a filling connecting member such as concrete mortar is filled in the space from the top.
[0033]
【The invention's effect】
As is clear from the description, the concrete dome roof according to the present invention has a lining steel plate on the lower surface on the roof portion between the upper end portion of one side wall and the upper end portion of the other side wall facing the other through the center of the roof. The concrete segments formed by intimately forming and welding together are connected to each other in the central direction to form at least one rigid-strength arch , and the remaining roof portion excluding the arch includes the arch and Since it is formed of a concrete covering member that fills the space between the upper end portions of the side walls , it is easy to position the segment and the covering member, and the work efficiency is improved. Moreover, since the airtightness of the concrete structure is obtained by welding the lining steel plate and the sealing property of the steel plate, it can be applied to the roof of a storage tank that safely stores low-temperature liquefied gas and the like.
In addition, the lining steel plate provided on the lower surface of the segment is also connected and constructed sequentially while projecting toward the center using the temporary lifting device, so that the upper end of the side wall or the protruding construction can be installed without using a scaffold or a frame. Since the next lining steel plate can be assembled and welded on the segment, it can be constructed safely and efficiently. In addition, the close fixation between the segment and the lining steel plate can be easily and easily performed with good work efficiency.
[0035]
In addition, concrete segments formed by tightly forming and welding welded lining steel plates to the lower surface are connected together along the circumferential direction to form an annular ring, and this ring is connected sequentially toward the center of the roof. The concrete dome roof according to the present invention in which the entire roof is formed by the annular portion formed and the zenith portion filling the center of the innermost ring of the annular portion is easy to position the segments and the covering member, and the work efficiency is improved. To do. Moreover, since the airtightness of the concrete structure is obtained by welding the lining steel plate and the sealing property of the steel plate, it can be applied to the roof of a storage tank that safely stores low-temperature liquefied gas and the like.
In addition, the lining steel plate provided on the lower surface of the segment also uses the temporary lifting device, and sequentially connects along the circumferential direction to construct the annular portion, so that the upper end of the side wall can be used without using a scaffold or a frame. Since the next lining steel plate can be assembled and welded by riding on a part or an annularly installed segment, it can be constructed safely and efficiently. In addition, the close fixation between the segment and the lining steel plate can be easily and easily performed with good work efficiency.
[0040]
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a plan explanatory view showing an embodiment of a concrete dome roof according to the present invention, in which a self-supporting arch is constructed and an entire dome roof is constructed.
FIG. 2 is a plan explanatory view showing another embodiment of the concrete dome roof according to the present invention, in which a self-supporting arch is constructed to construct the entire dome roof.
FIG. 3 is a plan explanatory view showing an embodiment of a concrete dome roof according to the present invention, in which an annular ring is connected to form an entire dome roof.
FIG. 4 is an explanatory perspective view showing an embodiment of a segment serving as a member used for construction of a concrete dome roof according to the present invention.
FIG. 5 is a perspective explanatory view showing the vicinity of the upper end of the side wall of the concrete dome roof according to the present invention and a part of the installation state of the temporary lifting device used for constructing the dome roof.
FIG. 6 is an explanatory perspective view of a concrete dome roof according to an embodiment of the present invention, with a part thereof removed showing a situation in which a lining steel plate is formed in close contact with the lower surface of a segment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Dome roof 2 Side wall 3 Side wall upper end part 4 Zenith part 5, 5A, 5B, ... Segment 6 PC steel material 7 Fixing part 8, 8A, 8B Arch 9, 9A, 9B, ... Segment 10, 10A, 10B, ... Ring 11 Zenith part 12, 12A, 12B Connection fitting 13 PC sheath 14 Connection tool 15 Lifting device 16 Strut 17 Pulley 18 Wire 19 Lifter 20 Lifting tool 21 Segment 22 Lined steel plate 23 Welding part 24 Connection bolt 25 Connection Nut 26 Connection opening

Claims (2)

A concrete dome roof covering an upper part of a side wall of a structure such as a storage tank, wherein the roof between the upper end of one side of the side wall and the upper end of the opposite side wall through the center of the roof. The concrete segments formed by welding the lining steel plate integrally and welded to the bottom surface are connected to each other in the center direction to form at least one rigid arch, and the rest excluding the arch The concrete roof is formed of a concrete covering member that fills a space between the arch and the upper end of the side wall. A concrete dome roof that covers the upper part of the side wall of a structure such as a storage tank, the concrete dome roof having a concrete segment formed by tightly bonding a lining steel plate on the lower surface and welding together along a circumferential direction. An annular ring is formed by connecting to each other, and the entire roof is composed of an annular portion formed by sequentially connecting the rings from the upper end of the side wall toward the center of the roof, and a zenith portion filling the innermost ring center of the annular portion. A concrete dome roof characterized by the formation.

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