JP4521791B2 - Grout construction method for exposed column base - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for injecting a grout material into the lower surface of a base plate of an S-type or SRC-type exposed column base.
[0002]
[Prior art]
Needless to say, in the construction of the exposed column base, the adhesion between the base plate and the foundation concrete integrally installed at the lower end of the steel column has a very important influence on the construction result. As the construction method, conventionally, a grout construction method in which a grout material such as a non-shrink grout material is injected and closely adhered between the lower surface of the base plate and the foundation concrete has been widely adopted. In addition, as a method for injecting the grout material, a mold is formed around the base plate, and the grout material is injected through an injection pipe leading to the inside of the mold, or between the outer surface of the base plate and the mold. A method is known in which a gap is provided and a grout material is injected through the gap using a flat plate or the like as a guide. There is also known a technique in which a special injection washer having an injection port formed in the tightening portion of the base plate is used, and a grout material is injected by inserting a small diameter portion of an injection funnel into the injection port of the injection washer.
[0003]
[Problems to be solved by the invention]
By the way, the prior art using an injection funnel is an effective method when the column size is relatively small, but the column size is increased because the injection port is small and the injection rate of the grout material is limited. As the base plate grows in size, it takes a considerable amount of time for the pouring operation, and in some cases, problems such as local hardening starting before the entire bottom plate is filled with grout material leading to poor filling. ing. The present invention has been made to solve such problems of the prior art, and is intended to increase the amount of grout material injected per unit time, and can be sufficiently adapted to increase the column size. The object is to provide a method for grouting the legs.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention forms a mold frame in a state where an installation space for an injection funnel is opened at a substantially central portion of the width of the base plate along the outer surface of the base plate, and the base plate is formed by the mold frame. An injection funnel having a horizontally long injection portion formed in a lower portion thereof and communicating with a lower gap portion of the base plate is disposed in the installation space, and the injection funnel is provided with a horizontally wide injection funnel. the grout via the injection unit and injected into the strip into the gap portion of the lower base plate, to divide the injection flow of the band-like grout on both sides by the lower central portion to form levels mortars of the base plate Rutotomoni, adopted technical means of performing air bleeding through the vent hole formed in the washer is set at the bottom of the fastening nut of the four corners of the base plate It was. As a result, a large amount of grout material can be quickly injected through the horizontally long and wide injection portion, so that it is possible to avoid poor filling as in the conventional case. In addition, since the pouring funnel is installed at a substantially central portion of the width of the base plate, a large amount of grout material to be poured in a strip shape from the horizontally wide pouring portion onto the foundation concrete is formed at the lower central portion of the base plate. Since the level mortar portion is divided into two parts and smoothly flows from both sides, a very good filling state can be easily obtained even for a large base plate. In addition, when the grout material is injected, air is vented through the vent holes formed in the washer set at the lower part of the fastening nuts at least at the four corners of the base plate, so that the exhaust is accurately performed from the four corners of the base plate. In addition, since the grout material is sequentially filled in each corner, it is possible to fill the corners of the gap below the base plate smoothly and accurately evenly even though a large amount of grout is quickly injected. .
[0005]
DETAILED DESCRIPTION OF THE INVENTION
As the exposed type column base to which the present invention is applied, a column having a large column size is suitable. However, when applied to a column having a small column size, the workability regarding the grout material injection work can be improved. In addition, the specific shape and material of the injection funnel can be freely selected. In short, it depends on the size of the gap below the base plate, that is, the total injection amount of the grout material and the hardening rate of the grout material. Thus, it is sufficient if it is provided with a horizontally long and wide injection portion that is large enough to obtain an injection rate sufficient to avoid poor filling. In other words, the injection portion provided at the lower portion of the injection funnel is a hole or window if it is a horizontally long and wide opening having an opening area that can communicate with the gap below the base plate and obtain a sufficient injection amount. Or a notch-shaped one. As the width dimension of the injection portion, although it depends on the column size, about 1/5 to 2/3 of the width dimension of the base plate is appropriate. Further, the injection portion may be formed on the lower front surface of the injection funnel or may be formed on the bottom surface and floated to communicate with the gap portion below the base plate. Regarding the method of supplying the grout material to the injection funnel, a large inlet is formed above the injection funnel, and the grout material is poured through the inlet, or the grout connected to the injection funnel. The grout material can be supplied through the material supply device. In addition, the number of injection funnels can be selected at one place or a plurality of places as necessary.
[0006]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing a construction state immediately before installing an injection funnel. In the figure, 1 is steel columns, 2 a base plate welded to the lower portion of the steel columns 1, 3 is tightened Tsukena Tsu City of anchor bolts. As shown in the figure, in the grouting method according to the present invention, a mold frame 4 made of a pedestal or the like is formed around the base plate 2 along its outer surface. In that case, in order to form an installation space for the injection funnel substantially at the center of the width of the base plate 2, a U-shape that can insert the lower half of the injection funnel 5 as shown in FIG. A space metal fitting 6 having a shape portion is installed. As shown in the figure, the space fitting 6 is installed at a substantially central portion of the width of the base plate 2 in this embodiment. In the figure, reference numeral 7 denotes a holding metal fitting, and abutment pieces 8 and 9 formed at right angles on both ends are brought into contact with the outer surface of the mold frame 4 so that the mold frame 4 does not bend when the grout material is injected. It is for holding. Moreover, between the outer surface of the baseplate 2 inside the corner | angular part of the formwork 4, both ends of the thin plate 10 for corner | angular part obstruction | occlusion provided with the flexibility which can deform | transform along the radius of the corner | angular part of the baseplate 2 Is configured to be held.
[0007]
3 and 4 are partially enlarged views showing other embodiments relating to the holding means of the mold 4. The embodiment in FIG. 3 uses a U-shaped connecting member 13 having an inner wall portion 11 and an outer wall portion 12 along the rounded corners of the base plate 2, and is adjacent between the inner wall portion 11 and the outer wall portion 12. The ends of the mold 4 to be fitted are connected and connected, and the corners of the mold 4 are held by the holding spring members 15 wound around the heads of the anchor bolts 14 to prevent bending when the grout material is injected. It is comprised so that it may do. In the embodiment of FIG. 4, a nail 16 or the like is driven in the vicinity of each anchor bolt 14 of the mold 4 and the head of the anchor bolt 14 and the nail 16 or the like are connected by a wire 17 or the like. It is configured to prevent bending when the grout material is injected.
[0008]
FIG. 5 is a front view showing an installation state of the injection funnel 5. As shown in FIG. 1, when the work for forming the mold 4 is completed in a state where an installation space for the injection funnel 5 is opened around the base plate 2, the space fitting is then moved as shown in FIG. The lower half of the injection funnel 5 is inserted into 6 and the grout material injection operation is performed. In the figure, 18 is a level mortar, and 19 is a support provided on the injection funnel 5.
[0009]
Thus, the grout material injection operation is performed by pouring the grout material contained in a bucket or the like through the wide inlet 20 formed at the top of the injection funnel 5 as shown in the perspective view of FIG. Is called. The grout material thrown into the inlet 20 is provided with a gap 24 between the base concrete 2 below the base plate 2 in FIG. 5 through a horizontally long and wide injection part 22 formed on the lower front surface along the slope 21 by its own weight. Injected into. In this case, since the injection portion 22 is formed in a horizontally wide shape, a large amount of grout material can be quickly injected into the gap portion 24, so that workability is improved and a column having a large column size as described above. Even in the case of the legs, the occurrence of poor filling as in the conventional case is eliminated. In particular, as described above, since the pouring funnel 5 is installed at a substantially central portion of the width of the base plate 2, the grout material poured in a strip shape from the horizontally wide pouring portion 22 onto the foundation concrete 23 is Since the level mortar 18 formed in the lower center portion of the base plate 2 is divided into two hands and smoothly flows from both sides, a very good filling state can be easily obtained. If the width of the injection portion 22 of the injection funnel 5 is set to about 1/5 to 2/3 of the width of the base plate 2, good workability can be obtained. Further, as a means for venting air when injecting the grout material, a vent hole is formed in a washer set under the tightening nut 3, and a gap between the anchor bolt 14 and the bolt insertion hole formed in the base plate 2 is formed. And it is comprised so that air bleeding may be performed through the vent hole formed in the washer.
[0010]
7 to 9 show perspective views of other embodiments relating to the injection funnel. In the injection funnel 25 shown as the embodiment of FIG. 7, if the same reference numerals are used for the same configuration as the injection funnel 5, the position of the injection portion 22 is changed from the lower front surface to the bottom surface, and the injection portion 26 is changed. It is different only in the point. In the case of the present embodiment, in a state where the main injection funnel 25 is installed in the space fitting 6, the injection portion 26 formed on the bottom surface of the lower portion is set in a state of floating from the upper surface of the foundation concrete 23. Then, the grout material is injected into the gap portion 24 below the base plate 2 in a band shape through the gap between the injection portion 26 and the foundation concrete 23.
[0011]
Further, the injection funnels 27 and 28 shown as the embodiments of FIGS. 8 and 9 correspond to the injection funnels 5 and 25, respectively. A horizontal portion 29 is formed at the lower end portion of 21, and a rising portion 30 is formed at the upper end portion, thereby increasing the capacity of the grout material in the injection funnels 27 and 28. And in another structure, there is no place different from the said injection funnels 5 and 25, respectively, and there exists the same function.
[0012]
【The invention's effect】
According to the present invention, the following effects can be obtained.
(1) An injection funnel in which a horizontally wide injection portion is formed at the lower portion along the outer periphery of the base plate, and a large amount of grout is placed in the gap below the base plate through the horizontally wide injection portion. Since the construction is such that the material is injected in a strip shape, the filling failure can be surely eliminated by quick injection even when the column size is increased, and the workability regarding the injection work can be improved.
(2) In addition, since the pouring funnel is installed at a substantially central portion of the width of the base plate, the grout material to be poured in a strip shape from the horizontally long wide pouring portion onto the foundation concrete is the lower central portion of the base plate. The level mortar part formed in the two is divided into two parts and smoothly flows in from both sides, and a very good filling state can be easily obtained even for a large base plate.
(3) Furthermore, when the grout material is injected, air is vented through the vent holes formed in the washer set at the bottom of the fastening nuts at least at the four corners of the base plate. Since exhaust is performed and grout material is sequentially filled in each corner, it is possible to fill the corners of the gap below the base plate smoothly and accurately evenly, despite the rapid injection of a large amount of grout material. Is possible.
[Brief description of the drawings]
FIG. 1 is a plan view showing a construction state immediately before installing an injection funnel in an embodiment of the present invention.
FIG. 2 is an enlarged perspective view showing an injection funnel and a space fitting of the same embodiment.
FIG. 3 is a partially enlarged view showing another embodiment relating to the mold holding means.
FIG. 4 is a partially enlarged view showing another embodiment relating to the mold holding means.
FIG. 5 is a front view showing an installation state of the injection funnel.
FIG. 6 is an enlarged perspective view showing an injection funnel.
FIG. 7 is an enlarged perspective view showing another embodiment relating to the injection funnel.
FIG. 8 is an enlarged perspective view showing another embodiment related to the injection funnel.
FIG. 9 is an enlarged perspective view showing another embodiment related to the injection funnel.
[Explanation of symbols]
1 ... steel columns, 2 ... base plate, 3 ... clamping Tsukena Tsu DOO, 4 ... mold, 5 ... injection funnel, 6 ... Space fitting, 7 ... holding bracket, 8,9 ... contact piece, 10 ... sheet, DESCRIPTION OF SYMBOLS 11 ... Inner wall part, 12 ... Outer wall part, 13 ... Connecting member, 14 ... Anchor bolt, 15 ... Holding spring member, 16 ... Nail, 17 ... Number wire, 18 ... Level mortar, 19 ... Post, 20 ... Loading port, 21 ... Slope, 22 ... Injection part, 23 ... Foundation concrete, 24 ... Gap part, 25 ... Injection funnel, 26 ... Injection part, 27, 28 ... Injection funnel, 29 ... Horizontal part, 30 ... Rise part

Claims (1)

A mold frame is formed in a state where an installation space for the injection funnel is opened at a substantially central portion of the width of the base plate along the outer surface of the base plate. The mold frame surrounds the periphery of the base plate, and the base plate is formed below the base plate. An injection funnel that forms a horizontally wide injection portion that can communicate with the lower gap portion is installed in the installation space, and the grout material is placed under the base plate through the horizontally wide injection portion of the injection funnel. is injected into the strip to the gap portion, the injection flow of the band-like grout is divided into two sides by the level mortar formed on the lower center portion of the base plate Rutotomoni, the lower portion of the fastening nut of the four corners of the base plate A grout construction method for an exposed column base, wherein air is vented through a vent hole formed in a washer to be set.

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