JP5545768B2 - Method for reinforcing underground structure and concrete structure - Google Patents

Description

  The present invention relates to an underground structure that was previously constructed with cast-in-place concrete or precast concrete products. In particular, the present invention is because water tanks such as fire prevention water tanks and earthquake-resistant water tanks that have been constructed in the past to store fire-fighting water used for fire-fighting activities in the event of a fire are stored as expected and used in the event of a fire. The present invention relates to a reinforcing method for reinforcing so as to satisfy the currently required seismic performance.

  2. Description of the Related Art Conventionally, transportation responsible for the distribution of goods in economic activities has developed, and the specific gravity has shifted from railway transportation to road transportation such as trucks, and vehicles used for road transportation have also become larger. The maximum total weight of trucks traveling on the road is regulated by the Vehicle Restriction Ordinance, but with the times, revisions have been made in line with the increasing size of vehicles. If it is limited to underground buried tanks such as fire prevention tanks and earthquake-resistant water tanks that store digestion water used for fire fighting activities, it will be constructed with cast-in-place concrete from around 1955 and precast concrete products from the latter half of the 1950s. Although the design corresponding to the total weight of the vehicle at that time has been made, there are few design books after 30 to 50 years have passed since the construction, for vehicles with the current maximum total weight It is doubtful whether it has sufficient earthquake resistance while having sufficient load resistance. Therefore, conventionally, a reinforcing method in which a support is provided between the top plate and the bottom plate has been performed (see, for example, Patent Document 1). In addition, fires always occur in earthquakes where houses have collapsed or damaged in recent years, and storage of fire extinguishing water necessary for fire fighting activities is indispensable to minimize the earthquake disaster. In order to perform fire extinguishing activities smoothly and reliably in the event of a fire, it is necessary to make the water tanks earthquake resistant.

  Furthermore, in order to reinforce the inside of these aquariums, in order to work in a narrow space in the aquarium, the reinforcing material is carried from the human hole provided in the aquarium or the water inlet pipe inlet, Therefore, it is difficult to reinforce with a large size or heavy object.

  Even if the conventional method of attaching the support between the top plate and the bottom plate can provide earthquake resistance capable of responding to vertical shaking, it was not possible to add earthquake resistance corresponding to the earthquake motion related to rolling. .

2010-189857 Publication

  The present invention pays attention to such inconveniences, and an object thereof is to provide the underground structure with earthquake resistance sufficient to effectively withstand the roll of an earthquake while being easy to carry in.

In order to achieve such an object, the present invention takes the following measures. That is, the method for reinforcing an underground structure according to the present invention is a method for reinforcing an underground structure made of concrete that has a bottom plate, a side plate, and a top plate and is configured so that a person can go in and out. or bottom plate and a side plate with each metal angle member in the corner portion formed by the fixed and assumes that formed by providing a tightening means for drawing the corners of the two pairs of diagonally positioned in plan view the same position respectively It is said . And, the present invention provides a steel material in which a steel plate is bridged on both ends in the short dimension direction of the fixed angle material, the angle material and the steel plate are welded, and the fastening means is a steel material having a base fixed to the steel plate. And having two pairs of corners brought close to each other through the steel plate and the angle member by bringing the bases close to each other.

  The concrete structure according to the present invention is made of concrete and includes the above-described tightening means.

  If this is the case, the top plate, bottom plate, side wall, and metal ankle material are fixed and provided by tightening means to realize a so-called brace structure. The deformation of the structure can be effectively prevented. In other words, it is possible to effectively improve the earthquake resistance of the underground structure.

  In order to further effectively improve the earthquake resistance of the underground structure, it is desirable to provide a plurality of fastening means in the extending direction of the corners.

  In order to effectively improve the earthquake resistance over the entire area of the underground structure, it is desirable to provide fastening means at equal intervals.

  Further, in order to more effectively suppress the deformation of the underground structure, it is desirable to fix the angle member over the entire corner.

In particular, in order to effectively improve not only the roll of the earthquake but also the earthquake resistance against the pitching, the present invention provides a column structure interposed between the top plate and the bottom plate based on the above assumption. characterized by comprising further provided in the center between the corners of the two pairs of diagonally positioned.

  In order to easily provide a strong column structure in the underground structure, the column structure has a plurality of cylindrical column elements, and the columns are connected in a state where the plurality of column elements are connected. It is desirable to fill the inside of the element with grout and harden the grout.

  In addition, in order to be able to be effectively subjected to the impact of pitching while suppressing the influence of the column structure on the bottom plate and the top plate, the column structure is provided with a column interposed between the column element and the top plate or the bottom plate. It is preferable to have a load dispersion material configured to have a larger area in plan view than the element.

  In addition, if the column structure has a cushioning material that is interposed between the column element and the top or bottom plate, the top plate is also covered with the cushioning material when a vertical load is applied due to the vertical vibration of the earthquake. Can be effectively absorbed.

  And in order to improve the earthquake resistance of the underground structure evenly, it is desirable to provide the fastening means and the column structure alternately at equal intervals in the extending direction of the corners.

  Furthermore, even if the above-described underground structure is configured such that a space where an operator can enter and exit is small like a water storage tank, the present invention can effectively provide earthquake resistance to the water storage tank. it can.

  According to the present invention, while being easy to carry in, it is possible to impart earthquake resistance sufficient to effectively withstand the rolling of an earthquake to an underground structure.

The front view which concerns on one Embodiment of this invention. The perspective view which fractures | ruptures a part which concerns on the embodiment, and shows an inside. Structure explanatory drawing which concerns on the same embodiment. Other composition explanatory views. The disassembled perspective view of the principal part which concerns on the same embodiment. Same as above. The perspective view which shows the other principal part which concerns on the same embodiment. The structure explanatory view concerning the modification of the present invention. The perspective view which shows the principal part which concerns on the modification. The perspective view which shows the other modification of this invention corresponding to FIG.

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

  The water storage tank 1 which is a concrete structure shown in FIGS. 1 and 2 is mainly composed of, for example, an in-situ underground structure 10 having a rectangular parallelepiped shape installed in the basement for fire prevention. It has a bottom plate 1a, a side plate 1b, and a top plate 1c, and is made of concrete configured so that a person can go in and out. The top plate 1c has a cylindrical water inlet 1c1 protruding upward from the vicinity of one end, and is provided so that the upper end of the water inlet 1c1 is exposed to the ground. Further, when an operator enters the underground structure 10 and performs an operation or the like, the worker enters the underground structure 10 from the suction pipe inlet 1c1 using a ladder or the like (not shown). On the other hand, the bottom slab 1a has a water collection pit 1a1 formed by recessing a portion corresponding to a position directly below the water inlet pipe inlet 1c1.

  Here, the water storage tank 1 according to the present embodiment is a method for reinforcing an underground structure 10 made of concrete having a bottom slab 1a, a side slab 1b, and a top slab 1c and configured to allow people to enter and exit. The metal angle members 2 are fixed to the corners 1d formed by the top plate 1c or the bottom plate 1a and the side plate 1b, respectively, and two pairs of corners 1d positioned diagonally at the same position in plan view are respectively provided. It is reinforced by the reinforcing method of the underground structure 10 characterized by providing the tightening means 4 for drawing.

  Hereinafter, a specific configuration of the water tank 1 will be described with reference to FIGS.

  The water storage tank 1 is provided with an angle member 2, a steel plate 3, a fastening means 4, and a column structure 5 for the underground structure 10 having the top plate 1 c, the side plate 1 b and the bottom plate 1 a as described above. Is. Moreover, in this embodiment, as shown in FIG.1 and FIG.2, it is located between the corner | angular part 1d located between the top plate 1c and the side plate 1b of the underground structure 10, and between the side plate 1b and the bottom plate 1a. The anchor member a is driven at a predetermined pitch into the corner portion 1d of the box-shaped inner surface along the extending direction of the corner portion 1d, and the anchor bolt av is fastened to the position of the anchor a. Each body 5 is fixed. In the underground structure 10, the fastening means 4 and the column structures 5 are alternately provided at equal intervals.

  As shown in FIGS. 2 to 4, the angle member 2 has a “<” shape, that is, a long and short dimension set to such a size that it can pass through the water inlet 1 c 1. It is a steel plate bent by 90 °. The angle members 2 are fixed over the entire area of the corner 1d by being arranged without gaps in the longitudinal direction. In other words, the angle member 2 fixed to the entire corner 1d can be easily carried in from the water inlet 1c1 by being divided into predetermined dimensions. The angle member 2 has a bolt hole 2c at a position corresponding to the anchor a driven into the underground structure 10, and is fastened to the anchor a with the anchor bolt av inserted through the bolt hole 2c. Thus, the angle member 2 is fixed to the corner 1d.

  As shown in the figure, the steel plate 3 is a rectangular plate-shaped steel plate that is set to a size that can span both ends in the short dimension direction of the angle member 2, and a tightening means that will be described later is provided at the center of the steel plate 3. 4 has a steel material fixing hole 3c for fixing the steel material 41 by welding.

  Thus, the water storage tank 1 according to the present embodiment draws the angle material 2 welded to the steel plate 3 by attaching the fastening means 4 according to the present invention to the locations where the steel plate 3 is welded. Is. Hereinafter, the fastening means 4 will be described.

  As shown in FIG. 4, the tightening means 4 is provided at two locations with respect to the underground structure 10. This tightening means 4 has, for example, a pair of two steel materials 41 having different lengths and a turnbuckle 42 that connects the two steel materials 41 while pulling them. The tightening means 4 is formed by pulling two pairs of corners 1d that are diagonally located at the same position in plan view in the underground structure 10 through the steel plate 3 and the angle member 2, respectively. The steel material 41 has a base portion 41a fixed to the steel plate 3 by welding, for example, and a male screw portion 41b screwed to the turnbuckle 42. The male screw portion 41b is provided with different threading directions of the male screw portions 41b having different lengths. The turnbuckle 42 has an annular buckle body 42a and female screw portions 42b provided at different ends of the buckle body 42a with different threading directions. That is, in the tightening means 4, the male screw portions 41b are brought into contact with and separated from each other by rotating the turnbuckle 42 that connects the male screw portions 41b. That is, the tightening means rotates the turnbuckle 42 so that the male screw portions 41b are brought close to each other, thereby pulling the paired corner portions 1d through the steel plate 3 and the angle member 2, respectively. is there.

  Furthermore, the water storage tank 1 according to the present embodiment includes a column structure 5 interposed between the top slab 1c and the bottom slab 1a in order to further improve the load resistance and to improve the resistance to the vertical shaking of the earthquake. In the present embodiment, three column structures 5 are arranged at equal intervals in the width direction of the bottom plate 1a or the top plate 1c, that is, the center in the short dimension direction. Hereinafter, the configuration of each part in the column structure 5 will be described.

  As shown in FIGS. 5 to 7, the pillar structure 5 includes a plurality of pillar elements 51 having a cylindrical shape, a rubber sheet 52 serving as a buffer material interposed between the pillar elements 51, the top plate 1c, and the bottom plate 1a, and H steel 53 as a load dispersion material, L-shaped steel 54 for fixing the column element 51 to the H steel 53, a grout hose 55 for allowing grout to pass therethrough, and in the column element 51 And a grout (not shown) filled with no gap. In FIG. 6 and FIG. 7, for convenience of explanation, illustration of the long bolt LV, the nut N, and the anchor bolt av for connection is omitted.

  The pillar element 51 includes a prism element 51a that is a plurality of pillar element bodies stacked in the vertical direction, a joint element 51b that is fixed in a state of covering a connection portion of the plurality of prism pillars 51a, and the top plate 1c side. That is, it has the edge part element 51c arrange | positioned at an upper end. In the present embodiment, as shown in FIG. 5, four prisms 51a are connected up and down by three joint elements 51b so as to correspond to the dimension between the top plate 1c and the bottom plate 1a. The prism 51a has a cylindrical shape having a quadrangular shape in plan view formed by bending or welding a steel plate, for example. The prism 51a has a longitudinal dimension that is set to a dimension that can be easily carried in from, for example, the water inlet 1c1 described above. A long bolt LV shown in FIG. Thus, a total of eight bolt holes 5c for coupling to the joint element 51b are formed on both sides. The joint element 51b is formed, for example, by bending and welding the same steel material 41 as the prism 51a in a cylindrical shape, and is configured to be able to fit into the prism 51a from the outside without a gap. Similarly to the prism 51a, the joint element 51b is formed with a total of eight bolt holes 5c on both sides for inserting the long bolt LV shown in FIG. Yes. As shown in FIG. 7, the end element 51 c is fixed to an H steel 53 fixed to the top plate 1 c side via an L-shaped steel 54, and has a gap from the inside with respect to the prism 51 a positioned at the top. It has a shape that can be fitted without any problems. As shown in the figure, bolt steel is not formed on the end element 51c. In order to accurately correspond to the distance between the prism 51a located at the top and the top plate 1c, the prism 51a is not fixed to the prism 51a using the long bolt LV and the nut N at such a position. Of course, the long bolt LV and the nut N may be combined.

  The rubber sheet 52 is made of, for example, hard rubber, and is attached to a position in contact with the top plate 1c and the bottom plate 1a. Specifically, the rubber sheet 52 is interposed between the top plate 1 c and the bottom plate 1 a and the H steel 53 and has an area corresponding to the dimension of the H steel 53 in plan view. Moreover, in this embodiment, this rubber sheet 52 has bolt holes 5c for fixing with H bolts 53 with anchor bolts av at four locations.

  The H steel 53 supports the column element 51 from above and below, and is formed on the bottom plate 1a and the top plate 1c from the column element 51 by forming the area in plan view larger than that of the column element 51. This is for dispersing the load. As shown in the figure, the H steel 53 has a column support plate 53a that is in contact with the upper end or lower end of the column element 51, and a surface that is separated from the column support plate 53a in the vertical direction and is in surface contact with the top plate 1c or the bottom plate 1a. And a contact plate 53b. The column support plate 53a and the surface contact plate 53b are respectively provided with L-shaped steel 54 and bolt holes 5c for connection to the top plate 1c or the bottom plate 1a.

  The L-shaped steel 54 is formed by bending the flat steel material 41 into an L shape, and is for positioning the column element 51 with respect to the H steel 53. In the present embodiment, the lower L-shaped steel 54 allows the grout hose 55 to penetrate into the prism 51a at the position indicated by the broken line.

  The grout hose 55 is for injecting grout into the column element 51. The lower grout hose 55 is disposed so as to penetrate from the portion indicated by the broken line in the lower L-shaped steel 54 to the inside of the column element 51. Further, the upper grout hose 55 is disposed so as to penetrate from the location indicated by the broken line in the column support plate 53 a in the upper H steel 53 to the inside of the column element 51.

  In the present embodiment, grout is not particularly illustrated, but for example, PC grout widely applied to concrete products is applied. However, the grout applicable to the present invention is not limited to the PC grout, and existing grouts can be widely applied.

  Thus, in the present embodiment, things other than the grout described above are assembled. Specifically, the surface contact plate 53b of the H steel 53 is fixed by the anchor a nut N with the rubber sheet 52 sandwiched between the inner surface of the bottom plate 1a. Subsequently, on the column support plate 53 a of the H steel 53, the prism 51 a and the L-shaped steel 54 disposed at a position sandwiching the prism 51 a are arranged, and the L-shaped steel 54 is fixed to the H steel 53. Then, the prism 51a and the joint element 51b are connected, and the end element 51c is fitted into the prism 51a positioned at the top. Then, in a state where the end element 51c is positioned on the column support plate 53a by the L-shaped steel 54, the surface contact plate 53b is fixed to the top plate 1c via the rubber sheet 52 using the anchor a nut N. After that, the hollow column element 51 is completed as shown in FIG. 5 by attaching the grout hose 55 so as to penetrate through the lower L-shaped steel 54 and the upper column support plate 53a. And in the state of the figure, said PC grout is inject | poured from the hose 55 for grout below. Specifically, the grout is injected from the grout hose 55 provided on the upper side until the grout overflows, so that the inside of the column element 51 is filled with the PC grout without a gap.

  Then, by hardening the PC grout filled in the column element 51 without a gap, the column structure 5 according to the present embodiment, which is excellent in load resistance and earthquake resistance against vertical pitching of an earthquake, is completed.

  With the configuration as described above, the water storage tank 1 which is a concrete structure according to the present embodiment realizes a so-called brace structure by the fastening means 4, so that an underground structure at the time of an earthquake can be obtained by applying a tensile force by the brace structure. The deformation of the object 10 can be effectively prevented. In other words, the earthquake resistance of the underground structure 10 is effectively improved.

  In the present embodiment, in order to further effectively improve the earthquake resistance of the underground structure 10, a plurality of tightening means 4 are provided in the extending direction of the corner 1d. In particular, in the present embodiment, the angle material 2 is also divided into a plurality of parts, whereby the angle material 2 can be easily carried in from the water inlet 1c1 and the fastening means 4 can be installed easily and quickly. ing.

  Furthermore, in this embodiment, in order to effectively suppress deformation of the underground structure 10, the angle member 2 is fixed over the entire area of the corner 1d. Thereby, the deformation | transformation of the corner 1d which arises by the displacement with the top plate 1c and the bottom plate 1a, and the side plate 1b can be suppressed effectively.

  In particular, in the present embodiment, in addition to the improvement of earthquake resistance against earthquake rolls by the tightening means 4, a column structure 5 interposed between the top plate 1c and the bottom plate 1a is further provided to provide earthquake resistance against earthquake pitching. The property can be effectively improved.

  In order to easily provide a strong column structure in the underground structure 10, in this embodiment, the column structure 5 includes a plurality of column elements 51 having a cylindrical shape, and the plurality of column elements 51. In this state, grout is filled into the column element 51 and the grout is hardened.

  Further, since the column structure 5 has the rubber sheet 52 made of hard rubber as a cushioning material interposed between the column element 51 and the top plate 1c or the bottom plate 1a, a vertical load is applied by a large-sized vehicle. Sometimes, the cushioning material can effectively absorb the displacement of the top plate 1c.

  In addition, in order to be able to receive a load effectively while suppressing the influence of the column structure 5 on the bottom plate 1a and the top plate 1c, in this embodiment, the column structure 5 is composed of the column element 51 and the top plate 1c or the bottom plate 1a. H steel 53, which is a load distribution material having a larger area in plan view than the column element 51 interposed between the two, is applied.

  In order to improve the seismic resistance of the underground structure 10 in a well-balanced manner, in the present embodiment, the fastening means 4 and the column structure 5 are alternately spaced at equal intervals in the extending direction of the corner 1d. It is assumed that it was provided.

<Modification>
Hereinafter, modified examples of the present embodiment will be described, and the same reference numerals are given to the modified examples corresponding to the components in the embodiment, and detailed description thereof will be omitted.

  Although the concrete structure according to the above embodiment is mainly made of an on-site underground structure 10, of course, the present invention is applied to an underground structure 10 made of precast concrete, that is, a concrete secondary product, as in this modification. Also good.

  As shown in FIG. 8, the underground structure 10 made of such a secondary concrete product is provided with a haunch 1h at a corner 1d. That is, in the present modification, it is desirable to provide the angle member 2 with a haunch-corresponding portion 2h that can handle such a haunch 1h. Specifically, as shown in FIG. 9, the flat steel member 41 constituting the angle member 2 is bent twice at an angle of 135 ° to form the haunch corresponding portion 2h. The bolt holes 2c are respectively formed on three surfaces formed by bending, for example.

  Even in such a case, the deformation of the underground structure 10 due to the load or the shaking of the earthquake can be effectively suppressed as in the above embodiment, and the steel plate 3 can be welded in the same manner as in the above embodiment. It is possible to provide the same fastening means 4 as the form.

<Other variations>
Further, the present invention is not limited to the modes shown in the above-described embodiments and modifications. For example, as shown in FIG. 10, a plurality of tightening means 4 may be provided without providing the column structure 5.

  In the water tank 1 which is a concrete structure shown in the figure, five fastening means 4 are provided at equal intervals along the longitudinal direction of the underground structure 10. If it is such, it is possible to further improve the resistance to the roll of an earthquake.

  Although the embodiment of the present invention has been described above, the specific configuration of each unit is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, in the above-described embodiment and each modified example, the water tank for fire prevention is illustrated as an example of the underground structure, but of course, the underground structure is not limited to the water tank for fire prevention, other than for fire prevention It can be widely applied to various water storage tanks used in the underground, underground structures such as underground culverts and box culverts.

  Further, for example, in the above-described embodiment, a mode in which the fastening means is realized by a steel material is disclosed. However, a wire may be used as long as it can be pulled. Further, the shape of the column structure and the specific mode of the angle member are not limited to those of the above embodiment, and various modes including the existing ones can be applied.

  In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

INDUSTRIAL APPLICABILITY The present invention can be used as a reinforcing method for reinforcing underground structures that have been constructed with cast-in-place concrete or precast concrete products in the past.

1 ... Concrete structure (water tank)
DESCRIPTION OF SYMBOLS 1a ... Bottom plate 1b ... Side plate 1c ... Top plate 1d ... Corner 2 ... Angle material 4 ... Tightening means 5 ... Column structure 51 ... Column element 52 ... Buffer material (rubber sheet)
53 ... Load distribution material (H steel)

Claims (11)

A method of reinforcing an underground structure made of concrete having a bottom plate, a side plate, and a top plate and configured to allow people to enter and exit,
Fix metal angle materials to the corners formed by the top plate or bottom plate and the side plate,
A steel plate is bridged between both ends in the short dimension direction of the fixed angle material, and the angle material and the steel plate are welded.
The steel plate has a steel base fixed to the steel plate, and the two base corners located diagonally at the same position in plan view are brought close to each other through the steel plate and the angle material. A method for reinforcing an underground structure, characterized in that a tightening means is provided for each of them. A method of reinforcing an underground structure made of concrete having a bottom plate, a side plate, and a top plate and configured to allow people to enter and exit,
Fix metal angle materials to the corners formed by the top plate or bottom plate and the side plate,
In addition to providing tightening means for drawing two pairs of corners located diagonally at the same position in plan view,
A method for reinforcing an underground structure, wherein a columnar structure interposed between the top plate and the bottom plate is provided in the center between two corners located diagonally. The method for reinforcing an underground structure according to claim 1 or 2, wherein a plurality of the tightening means are provided in the extending direction of the corner. The method for reinforcing an underground structure according to claim 3, wherein the tightening means are provided at equal intervals. The method for reinforcing an underground structure according to claim 1, wherein the angle member is fixed over the entire area of the corner. It said post structure has a plurality of pillar elements forming a cylindrical, claim 2 in the connected state of the plurality of pillar elements filling the interior of the pillar element is made by curing the grout Reinforcing method for underground structure as described. The method for reinforcing an underground structure according to claim 2 or 6, wherein the column structure has a load distribution material configured to have a larger area in plan view than the column element. The method for reinforcing an underground structure according to claim 2 , 6, or 7, wherein the pillar structure has a cushioning material in contact with the top plate or the bottom plate. The method for reinforcing an underground structure according to claim 2 , 6, 7, or 8, wherein the tightening means and the column structure are provided alternately at equal intervals in the extending direction of the corner. The method for reinforcing an underground structure according to claim 1, wherein the underground structure is a water tank. A concrete structure made of concrete, comprising the fastening means according to any one of claims 1 to 10.

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