JP4856737B2 - Foundation reinforcement method for existing houses - Google Patents

Description

  The present invention reinforces the foundation to prevent the foundation of the existing house from sinking due to an earthquake or the like, and in particular, repairs the foundation when the foundation of the existing house sinks unevenly due to an earthquake or the like. The present invention relates to a foundation reinforcement method for reinforcement. In addition, this unequal subsidence refers to subsidence in which the amount of ground subsidence below the foundation surface of an existing house varies depending on the location.

  Conventionally, when the foundation of an existing house sinks unequally due to an earthquake or the like, the column tilts, or a part of the foundation falls, after the foundation becomes stable, leave the foundation as it is, Jack up the foundation on the foundation to a predetermined height, adjust the level, fix the foundation horizontally by inserting a spacer between the foundation and the foundation, etc. We were repairing.

  As mentioned above, the foundation itself is not reinforced in the past, but only the level is adjusted by jacking up the foundation on this foundation. It was very uneasy for the person.

  In view of the above problems, the present invention can effectively prevent the settlement of the foundation of an existing house due to an earthquake or the like, and can be easily and easily constructed in an existing house, thereby reducing the construction cost. The purpose is to provide a reinforcement method.

  Means for solving the above problems will be described with reference numerals in the embodiments described later. The foundation reinforcing method for an existing house according to claim 1 is a vertical wall portion 1a as shown in FIG. In the existing house, the horizontal leg 1b of the inverted T-shaped cloth base 1 having a cross section and the horizontal leg 1b is adjacent to both side ends of the horizontal leg 1b at symmetrical positions on both sides of the hanging wall 1a. After driving the pile 5 into the ground with the pile driver 7, the two cross members 20 that receive the cloth foundation 1 under the cloth foundation 1 are excavated near the upper ends of the piles 5 and 5. The piles 5 and 5 on both sides are inserted and sandwiched between the two side members 20 and 20, and the solidified material K such as mortar is poured into the recess 12 of the excavated ground so that the fabric foundation 1 and the pile 5 The cross member 20 and the cross member 20 are integrally coupled.

Claim 2 is a foundation reinforcement method for an existing house according to claim 1 , wherein each pile 5 includes a plurality of pile members 5 a that are sequentially added and connected via joints 26, as shown in FIGS. 8 to 9 . Each pile member 5a consists of a steel pipe or a reinforcing bar in which male threaded portions n are formed on the outer peripheral surfaces of the upper and lower ends, and the joint 26 is screwed into the upper half with the lower male threaded portion n of the upper pile member 5a. And it consists of the cylindrical main body 27 which formed the internal thread f in the internal peripheral surface so that the upper end external thread part n of the lower stage side pile member 5a may screw together in a lower half part.

According to a third aspect of the present invention, in the foundation reinforcing method for an existing house according to the second aspect , as shown in FIGS. 8 to 9 , the cylindrical main body 27 of the joint 26 has a flange 28 for increasing the supporting force at the center of the outer peripheral surface. It is characterized by being provided.

Claim 4 is a basic reinforcement method for an existing house according to claim 2 or 3 , as shown in FIGS. 8 to 9 , the lowermost pile member 5 a of each pile 5 has a tip portion at its lower end portion. A sharp bit 29 is attached.

The fifth aspect of the present invention is the foundation reinforcing method for an existing house according to any one of the third and fourth aspects, as shown in FIG. 9 , in the pile 5 composed of three or more pile members 5 a, the cylindrical shape of each joint 26. The flange 28 for expanding the support force projecting from the main body 27 is characterized in that the projecting height of the flange 28 becomes higher as the joint 26 becomes the upper stage side.

Claim 6 is that in the foundation reinforcing method of the existing house according to claim 1 , as shown in FIG. 10 , each pile 5 is composed of a screw rebar 5S or a deformed rebar 5D that is screwed over the entire length. Features.

  When the effect of the invention by the above solution is described with reference numerals of embodiments to be described later, according to the invention according to claim 1, the upper end portion of the pile 5 can be firmly coupled to the fabric foundation 1. .

According to the invention which concerns on Claim 2 , the lower end male screw part n of the upper stage side pile member 5a is screwed together in the upper half, and the upper end male screw part n of the lower stage side pile member 5a is screwed together in the lower half part. Thus, since it consists of the cylindrical main body 27 which formed the internal thread f in the internal peripheral surface, the work of adding the pile member 5a becomes easy and easy.

According to the invention of claim 3 , when the supporting force increasing flange 28 protrudes from the center of the outer peripheral surface of the cylindrical main body 17, a large upward ground reaction force on the lower surface side of the flange 28 of each joint 26. Therefore, a large supporting force can be obtained.

According to the invention according to claim 4 , since the lowermost pile member 5a of each pile 5 is provided with the bit 29 having a sharp tip at the lower end portion thereof, the driving operation is facilitated, even on a relatively hard ground. Easy to type.

According to the invention which concerns on Claim 5 , in the pile 5 in which the protrusion height of the flange 28 becomes so high that the flange 28 for supporting force increase of each joint 26 becomes the joint 26 of the upper stage side, the pile 5 is whole. If it sees specifically, since the pile 5 will exhibit the effect | action similar to the wedge effect by a taper pile with respect to the ground, much bigger bearing force is obtained.

According to the invention which concerns on Claim 6 , since the ground resistance is larger than the pile 5 made from a steel pipe or a reinforcing bar when the pile 5 consists of a screw rebar 5N or a deformed reinforcing bar 5D, a supporting force can be raised.

  FIG. 1 is a perspective view of a state in which the foundation reinforcing method according to the present invention is carried out in an existing house. In this figure, 1 is a concrete fabric foundation with a T-shaped cross section composed of a hanging wall portion 1a and a horizontal leg portion 1b, and 2 is a base for supporting a wooden house, and anchor bolts on the hanging wall portion 1a of the cloth foundation 1 The column 3 is erected on the vertical wall 1a. A chestnut stone G is disposed below the fabric foundation 1.

  A method suitable for reinforcing the fabric foundation 1 will be described with reference to FIGS. 2 to 6. FIG. 2 (a) is a front view showing the fabric foundation 1 before being reinforced and the base 2 fixed thereon. Then, about half of the fabric foundation 1 is buried in the earth and sand M, (b) is a cross-sectional view taken along the line II in (a). It is assumed that the fabric foundation 1 is somewhat submerged with respect to a predetermined level due to an earthquake or because the ground is soft.

  In order to reinforce the fabric foundation 1, first, the anchor bolt that fastens and fixes the base 2 to the fabric foundation 1 is pulled out, and a notch opening is formed in the vertical wall portion 1a of the fabric foundation 1 as shown in FIG. A portion O is formed, and a hydraulic jack J is installed here. The base 2 is jacked up to a predetermined level by this hydraulic jack J, and the horizontal level is adjusted, and then shown in FIGS. 3 (a) and 3 (b). As described above, the base 2 is fixed at a level up to a predetermined height by inserting a spacer S or the like between the upper surface of the hanging wall portion 1a of the fabric foundation 1 and the lower surface of the base 2.

  After the foundation 2 is leveled up, the reinforcement work for the cloth foundation 1 is started. Before this reinforcement work, the earth and sand M covering the cloth foundation 1 is excavated and discharged, as shown in FIG. ), The horizontal leg 1b appears as shown in (b). Thus, a plurality of piles 5 are driven by a pile driving machine 7 to a predetermined depth (depth reaching a hard support layer such as bedrock) so as to penetrate the horizontal leg 1b of the fabric foundation 1. As shown in FIGS. 4A and 4B, the horizontal leg portion 1b of the fabric foundation 1 is provided with a pile penetration opening 4 that is sufficiently larger than the outer diameter of the pile 5 by a drill 8 in advance at the pile penetration location. The pile 5 is driven into the ground through the opening 4.

  As shown in FIG. 1, the pile driving machine 7 is a well-known hydraulic hammer type small pile driving machine having manual operation handles 7b, 7b on both sides of a body 7a, and a head 7c protruding from the lower end of the body 7a. Is piled up in a state where it is fitted to the upper end of the pile 5 standing on the ground. Since the small pile driver 7 has a weight of about 20 kg, one worker can easily perform the pile driving work even in a narrow place in the existing house.

  As described above, if the pile 5 is driven to a predetermined depth that can reach the hard support layer in the ground so as to penetrate the horizontal leg 1b of the fabric foundation 1, the solidified material K such as mortar or cement milk penetrates the pile. The pile 5 is integrally coupled with the foundation 1 by pouring around the opening 4 and its upper side. In this case, although illustration is omitted, if a mold is installed on each side end face of the horizontal leg 1b of the fabric foundation 1 and a solidifying material K such as mortar is supplied between the two molds, the solidified material K fills the inside of the opening 4 for penetrating the pile 5 through which the pile 5 penetrates and fills the upper side of the horizontal leg 1b to the required thickness, and after the solidifying material K is solidified, the mold is removed. 6 (a) and 6 (b), the upper end of the pile 5 is integrally coupled to the fabric foundation 1 through the solidifying material K, and the fabric foundation 1 is integrally coupled thereto. The pile 5 is supported by the pile 5 and the settling force is effectively prevented by the support force of the pile 5. 1 to 6 show preconditions or reference steps for carrying out the present invention.

FIG. 7 shows one embodiment of the present invention, and shows various methods suitable for reinforcing the fabric foundation 1. In these figures, the base supported by the cloth foundation 1 and the pillars standing on the base are not shown.

  The foundation reinforcement construction method shown in FIG. 7 is a construction method in which a cross member 20 is inserted below the cross-section inverted T-shaped fabric foundation 1 composed of the vertical wall portion 1a and the horizontal leg portion 1b. After driving the pile 5 so as to be adjacent to both end portions of the horizontal leg 1b at both sides symmetrical positions around the vertical wall portion 1a, as shown in the figure, the ground near the upper end portion of the pile 5 and both piles 5 , 5 and excavating the ground of the lower part of the horizontal leg 1b and inserting the two cross members 20 and 20 for receiving the fabric foundation 1 under the horizontal leg 1b. The piles 5, 5 on both sides are sandwiched between the cross members 20, 20, and a solidified material K such as mortar is poured into the recess 12 of the excavated ground so that the cloth foundation 1, the pile 5, and the cross member 11 are poured. Are integrated with each other.

  In this construction method, as shown in FIGS. 7 (a) and 7 (b), when the pile 5 is a screw rebar, the nut 13 is fixed at a required position at the upper end thereof, and the pile 5 is a steel pipe or a normal rebar. In this case, a mounting member such as a nut is welded to the required position at the upper end portion, and a ring-shaped washer 14 is mounted on the nut 13 or the mounting member, so that two cross members made of a channel member are used. Two are supported on the washers 14 and 14 of the two piles 5 and 5 with the piles 5 and 5 on both sides sandwiched between the backs 20 and 20 as shown in the figure. The connecting plates 15 and 15 are welded to both ends of the cross members 20 and 20, respectively, so that both the cross members 20 and 20 are integrally connected.

  According to the foundation reinforcement method as described above, the upper end portion of the pile 5 can be firmly coupled to the fabric foundation 1.

Each pile 5 used in the foundation reinforcing method described above is composed of a plurality of pile members 5a that are sequentially added and connected via joints 26 as shown in FIGS. 1 and 4 to 7 . A female screw f (FIG. 8 (a) in FIG. 8) is formed such that the lower half male screw portion n of the upper-stage pile member 5a is screwed to the upper half and the upper male screw portion n of the lower-stage pile member 5a is screwed to the lower half. ) To (c)) are formed. A bit 29 having a sharp tip is attached to the lowermost pile member 5a of each pile 5, that is, the lower end portion of the pile member 5a to be driven first. This bit 29 is intended to enable easy driving even on relatively hard ground.

FIG. 8 shows a pile 5 in which each pile member 5a is formed of a steel pipe, and FIG. 9 shows a pile 5 in which each pile member 5a is formed of a reinforcing bar. 8 (a) is a front view of the pile 5 including, for example, four steel pipe pile members 5a, each of the joints 26 connecting the pile members 5a including only the cylindrical main body 27. FIG. Is a plan view thereof. In (b) the pile 5 consisting Similarly four steel pipe pile member 5a in FIG. 8, a front view of a pile 5 of the flange 28 of the supporting force for increasing the outer peripheral surface central portion of the joint 26 is projected , (B ′) is a plan view thereof. FIG. 8 (c) shows a pile 5 composed of four steel pipe pile members 5a, and the protrusion height of the flange 28 increases as the supporting force increasing flange 28 of each joint 26 becomes the upper joint 26. The front view of the pile 5 which is attached, (c ') is its plan view.

(A) of FIG. 9 is a pile 5 made of, for example, four reinforcing bars made stake member 5a, a front view of a pile 5 of the joint 26 that connects the stake member 5a is composed of only the tubular body 27, (a ') thereof It is a top view. FIG. 9 (b) is a front view of the pile 5 in which the flange 5 for supporting force is projected from the center portion of the outer peripheral surface of each joint 26 in the same manner. , (B ′) is a plan view thereof. The (c) of FIG. 9 is a pile 5 consisting of four rebar steel stake member 5a, the supporting force increases flange 28 of each joint 26, the protrusion height of about flange 28 will joint 26 of the upper side is higher (C ') is a plan view of the pile 5 that is attached.

  When the pile 5 having the above configuration is used, the pile member 5a as shown in FIG. 1 and FIG. 4 (b) is used to place the first pile member 5a in the ground, and the upper end of the pile member 5a is required from the fabric foundation 1 or the ground surface. After driving in to the extent which protrudes length, the lower half of the cylindrical main body 27 of the joint 26 is screwed to the upper end male thread portion n of the first pile member 5a, and then the next pile member 5a is connected to the upper half of the cylindrical main body 27. The next pile 5 is connected to the first pile 5 by screwing the lower end male thread portion n of the first pile 5, so that the next pile 5 is put into the ground by the pile driving machine 7, and the upper end thereof is the fabric foundation 1 or the ground. Drive to the required length protruding from the surface. In the same manner, a plurality of pile members 5a are driven to a predetermined depth in the ground while being added.

  When driving the pile 5 while sequentially adding the pile members 5a as described above, each pile member 5a forms male threaded portions n on the outer peripheral surfaces of the upper and lower ends, and the joint 26 is an upper-side pile member in the upper half. Since it consists of the cylindrical main body 27 which formed the internal thread f in the inner peripheral surface so that the lower end male screw part n of 5a may be screwed and the upper end male screw part n of the lower stage side pile member 5a may be screwed to a lower half part, a pile member 5a can be easily and easily added.

Further, in FIG. 8 (b), (b ' ), (c), (c') in and FIG. 9 (b), (b ' ), (c), (c' as the joint 26 shown in) When the supporting force increasing flange 28 protrudes from the center of the outer peripheral surface of the cylindrical body 27, when the pile 5 is driven, a large upward ground reaction force is applied to the lower surface side of the flange 28 of each joint 26. Since it can be made to act, a large supporting force can be obtained.

Further, in FIG. 8 (c), (c ' ) in and FIG. 9 (c), (c' as the joint 26 illustrated in), the joint 26 supporting force increases flange 28 of the upper side of each joint 26 In the pile 5 in which the protruding height of the flange 28 is higher, the pile 5 exhibits the same action as the wedge effect by the tapered pile on the ground when the pile 5 is viewed as a whole. Therefore, greater support can be obtained.

8 and 9 show the steel pipe and steel bar pile 5, but the pile 5 used in the method of the present invention is screwed over the entire length as shown in FIG. 10 (a). A threaded reinforcing bar 5N or a deformed reinforcing bar 5D as shown in FIG. The pile 5 composed of the threaded reinforcing bar 5N and the deformed reinforcing bar 5D is also composed of a plurality of pile members that are sequentially added and connected through well-known joints in the same manner as the steel pipe and the reinforcing steel pile 5 described above. The illustration is omitted for. Since the pile 5 which consists of such a screw rebar 5N and the deformed rebar 5D has a ground resistance larger than the pile 5 made from a steel pipe or a rebar, it can raise a supporting force.

It is a perspective view of the state which is implementing the foundation reinforcement construction method used as the premise of this invention in the existing house. (a) is a front view showing a fabric foundation before being reinforced and a base fixed thereon, and (b) is a cross-sectional view taken along the line II in (a). FIG. 2B is a front view showing a state where the base is jacked up, and FIG. (a) is a front cross-sectional view showing a state in which a pile is driven into the ground so as to penetrate the horizontal leg of the fabric foundation, and (b) is a cross-sectional view along the ha-ha line of (a). (a) is a front sectional view showing a state in which a cross member is inserted so as to receive the fabric foundation under the fabric foundation, and (b) is a sectional view of the knee line of (a). A comparison with the present invention or a reference example is shown, (a) is a front sectional view showing a state in which reinforcement of a fabric foundation is completed by holding a cross member integrally with a pile, and (b) is (a). FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front sectional view showing an embodiment of a cloth foundation reinforcing method according to the present invention, and FIG. It is explanatory drawing which shows the various examples of the pile in which each pile member was formed with the steel pipe. It is explanatory drawing which shows the various examples of the pile in which each pile member was formed with the reinforcing bar. It is explanatory drawing which shows the pile which consists of a screw reinforcement and a deformed reinforcement.

1 fabric foundation 2 foundation 5 pile 5a pile member
20 Cross member 26 Joint 27 Tubular body 28 Flange for increasing support force

Claims (6)

  In the existing house, piles are placed on the horizontal leg of the inverted T-shaped fabric foundation consisting of the vertical wall and the horizontal leg so that the horizontal leg is adjacent to both ends of the horizontal leg at both sides of the vertical wall. Is driven into the ground with a pile driver, then the ground near the upper end of both piles is excavated, and two cross members receiving the fabric foundation are inserted under the fabric foundation, A foundation reinforcement method for an existing house, in which a solid foundation such as mortar is poured into the recess of the excavated ground, and the fabric foundation, pile and crosspiece are joined together. Each pile is composed of a plurality of pile members that are sequentially added and connected through joints, each pile member is composed of a steel pipe or a reinforcing bar with male threaded portions on the outer peripheral surfaces of the upper and lower ends, and the joint is an upper half according to claim 1, the lower end male screw portion of the upper side stake member is comprised of a cylindrical main body which is formed a female screw on the inner circumferential surface as upper male screw portion of the lower side stake member is screwed to the screwed and lower half parts Foundation reinforcement method for existing houses. The foundation reinforcing method for an existing house according to claim 2 , wherein the cylindrical main body of the joint is provided with a flange for increasing the supporting force at the center of the outer peripheral surface. The foundation reinforcement construction method of the existing house of Claim 2 or 3 to which the bit which the front-end | tip part sharpened is attached to the lower end part of the lowermost pile member of each pile. The pile of three or more stake member, the support force expansion flange projecting from the tubular body of each joint, according to claim protrusion height of the flange as made in the upper side of the joint is higher 3 or 4 A foundation reinforcement method for existing houses as described in any of the above. The foundation reinforcing method for an existing house according to claim 1 , wherein each pile is formed of a threaded reinforcing bar or a deformed reinforcing bar that is threaded over the entire length.

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