JP2006028877A - Method of reinforcing foundation of existing house - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of reinforcing a foundation of an existing house, according to which subsidence of the foundation of the existing house, caused by an earthquake or the like, is effectively prevented, and reinforcing work can be easily carried out in the house, to thereby reduce reinforcing costs. <P>SOLUTION: According to the method, piles 5 are driven into the ground down to a predetermined depth by a pile driver 7 so as to vertically penetrate necessary portions of the foundation 1 formed of a continuous footing or a mat foundation, or so as to adjoin the foundation 1. Thereafter the piles 5 are united to the foundation 1 in one body. <P>COPYRIGHT: (C)2006,JPO&NCIPI

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 based on a cloth foundation or a solid foundation in an existing house. The pile 5 is driven into the ground to a predetermined depth by a pile driving machine 7 so as to penetrate through a required portion of the foundation 1 to be up and down or adjacent to the foundation 1, and then the pile 5 is integrated with the foundation 1. It is characterized by being combined.

  A second aspect of the present invention provides the foundation reinforcing method according to the first aspect, wherein a required portion of the foundation 1 is provided with an opening 4 for penetrating a pile that is sufficiently larger than the diameter of the pile 5, and the pile 5 is placed in the ground from the opening 4. Then, the solidified material K such as mortar is poured into the pile penetrating opening 4 so that the pile 5 is integrally coupled to the foundation 1.

  Claim 3 is the foundation reinforcing method according to claim 1, wherein the horizontal leg 1b of the inverted T-shaped cloth base 1 composed of the vertical wall 1a and the horizontal leg 1b is symmetrical on both sides of the vertical wall 1a. A pile penetrating opening 4 is provided at a position, and after a pile 5 is driven into the ground through the opening 4, a solidifying material K such as mortar is poured into the opening 4 to form a horizontal plate 9a and a vertical plate 9b. The horizontal plate 9a of the L-shaped plate 9 is disposed on the horizontal leg portion 1b of the fabric foundation 1 so as to cover the upper end portion of the opening 4 for penetrating the pile, and the vertical plate 9b is brought into contact with the side surface of the hanging wall portion 1a. The vertical plates 9b and 9b that are in contact with both side surfaces of the vertical wall 1a are connected to each other by bolts and nuts 10 penetrating the vertical wall 1a.

  According to a fourth aspect of the present invention, in the foundation reinforcing method according to the second or third aspect, the pile-penetrating opening 4 has a truncated cone shape whose diameter on the upper end side is smaller than that on the lower end side.

  Claim 5 is the foundation reinforcement construction method according to claim 1, wherein the horizontal leg 1b of the inverted T-shaped cloth foundation 1 composed of the vertical wall 1a and the horizontal leg 1b is symmetrical on both sides of the vertical wall 1a. After driving the pile 5 so as to be adjacent to both side ends of the horizontal leg 1b at the position, the ground near the upper ends of both piles 5 and 5 is excavated to receive the cloth foundation 1 under the cloth foundation 2. Inserting the cross member 20 of the book, the piles 5 and 5 on both sides are sandwiched between the cross members 20 and 20, and the solidified material K such as mortar is poured into the recess 12 of the excavated ground, The cloth foundation 1, the pile 5, and the cross member 20 are integrally coupled.

  A sixth aspect of the present invention is the foundation reinforcing method according to the first aspect, wherein the horizontal leg 1b of the inverted T-shaped cloth foundation 1 composed of the vertical wall 1a and the horizontal leg 1b is symmetrical on both sides of the vertical wall 1a. A pile penetrating opening 4 is provided at a position, and a pile 5 is driven into the ground through the opening 4, and then a solidifying material K such as mortar is poured into the pile penetrating opening 4 to be formed on both side surfaces of the vertical wall 1a. The reinforcing frames 16 and 16 are brought into contact with each other, and both the reinforcing frames 16 and 16 are connected by the bolts and nuts 10 penetrating the hanging wall portion 1a. The reinforcing frame 16 covers the upper end portion of the opening 4 for pile penetration. The pile receiving plate 17 that receives the upper end of the pile 5 is attached.

  The foundation reinforcing method of the existing house of the invention according to claim 7 is that, in the existing house, after driving a plurality of piles 5 around the foundation 11 consisting of a bundle foundation to a predetermined depth in the ground with a pile driver, The ground around the foundation 11 is excavated to form a recess 14 surrounding the foundation 11 and the upper end portion of the pile 5 projecting around the foundation 11, and a plurality of reinforcing bars 15 are formed in the recess 14. After spanning between the upper ends of the piles 5, a solidifying material K such as mortar is poured into the recess 14 so that the foundation 11, the piles 5, and the reinforcing bars 15 are integrally coupled. .

  According to the eighth aspect of the present invention, there is provided a method for reinforcing a foundation of an existing house by excavating the surrounding ground of the old bundle foundation 11 supporting the bundle 23 in the existing house and surrounding the old bundle foundation 11. 30, the bundle 23 supported by the old bundle foundation 11 is jacked up to a required height, the old bundle foundation 11 is removed from the recess 30, and a plurality of piles 5 are piled from the inside of the recess 30. After driving into the ground to a predetermined depth by a hammer, concrete is poured into the recess 30 to form a new bundle foundation 11N, and the new bundle foundation 11N and the pile 5 are integrally coupled. It is characterized by that.

  Claim 9 is the foundation reinforcing method for an existing house according to any one of claims 1 to 8, wherein each pile 5 is composed of a plurality of pile members 5a that are sequentially added and connected via a joint 26. The 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 in the lower half. 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.

  A tenth aspect of the present invention is characterized in that, in the foundation reinforcing method for an existing house according to the ninth aspect, the cylindrical main body 27 of the joint 26 is provided with a flange 28 for increasing a supporting force at the center of the outer peripheral surface.

  Claim 11 is the foundation reinforcing method for an existing house according to claim 9 or 10, wherein the lowermost pile member 5a of each pile 5 has a bit 29 with a sharp tip attached to the lower end thereof. It is characterized by.

  Claim 12 is a foundation reinforcing method for an existing house according to claim 10 or 11, wherein the pile 5 composed of three or more pile members 5a is protruded from the cylindrical main body 27 of each joint 26. The supporting force expanding flange 28 is characterized in that the protruding height of the flange 28 becomes higher as the joint 26 on the upper stage side becomes.

  Claim 13 is the foundation reinforcing method for an existing house according to any one of claims 1 to 8, wherein each pile 5 is composed of a threaded reinforcing bar 5S or a deformed reinforcing bar 5D that is threaded over the entire length. To do.

  The effect of the invention by the above solution will be described with reference numerals of embodiments described later. According to the invention according to claim 1, the required part of the foundation 1 is vertically penetrated or the foundation 1 is provided. After the piles 5 are driven into the ground to a predetermined depth by the pile driving machine 7 so as to be adjacent to each other, the piles 5 are integrally coupled with the foundation 1, so the foundation 1 is integrally coupled with the foundation 1. The pile 5 is supported, and the support force of the pile 5 effectively prevents settlement. And according to this construction method, construction can be easily performed in an existing room, and construction costs can be reduced.

  The pile penetration opening 4 is provided in the required part of the foundation 1, and after driving the pile 5 into the ground through the opening 4, the solidification material K such as mortar is opened for the pile penetration. When it pours into the part 4 and its upper side periphery, and the pile 5 is combined with the foundation 1 integrally, construction becomes easier and easier.

  According to the invention which concerns on Claim 3, while connecting the upper end part of the pile 5 integrally with the fabric foundation 1 with the solidification material K which poured into the opening part 4 for pile penetration, the L-shaped plate attached to the cloth foundation 1 Since the upper end of the pile 5 is supported by the nine horizontal plates 9a, the settlement of the fabric foundation 1 can be more effectively prevented.

  According to the invention according to claim 4, the pile penetration opening 4 has a truncated cone shape. Therefore, if the fabric foundation 1 tries to sink, the opening is caused by the wedge effect on the inner peripheral surface of the truncated cone shaped opening 4. The solidified material K in the portion 4 is in a state in which the upper end portion of the pile 5 is locked in the opening 4, and the settlement of the fabric foundation 1 can be effectively prevented.

  According to the invention which concerns on Claim 5, the upper end part of the pile 5 can be firmly combined with the fabric foundation 1. FIG.

  According to the invention which concerns on Claim 6, while the upper end part of the pile 5 can be firmly couple | bonded with the cloth foundation 1, when a crack generate | occur | produces in the vertical wall part 1a of the cloth foundation 1, the crack location 22 is set to both sides It can reinforce by a pair of reinforcement frames 16 and 16 and can prevent destruction of hanging wall part 1a.

  According to the invention according to claim 7, after driving a plurality of piles 5 around the foundation to a predetermined depth with a pile driving machine 7, the foundation and the foundation are excavated around the foundation. A recess 24 is formed so as to surround the upper end portion of the pile 5 projecting to the periphery of the pile 5, and a plurality of reinforcing bars 25 are arranged so as to be bridged between the upper end portions of the pile 5 in the recess 24. Since the solidified material K such as mortar is poured into the mortar 24 and the foundation, the upper end of the pile 5 and the reinforcing bar 25 are integrally coupled, the foundation is supported by the pile 5, and the subsidence is caused by the support force of the pile 5. Is prevented. Moreover, according to this construction method, construction can be easily performed in an existing room, and construction costs can be reduced.

  According to the invention according to claim 8, when the bundle foundation 11 is damaged, the new bundle foundation 11N can be easily and easily installed, and the new bundle foundation 11N is supported by the pile 5 integrally coupled thereto, The support of the pile 5 can prevent the new bundle foundation 11N from sinking.

  According to the invention which concerns on Claim 9, 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 tenth aspect of the present invention, when the supporting force increasing flange 18 projects from the center of the outer peripheral surface of the cylindrical main body 17, a large ground reaction force upward on the lower surface side of the flange 18 of each joint 16. Therefore, a large supporting force can be obtained.

  According to the eleventh aspect of the present invention, since the lowermost pile member 5a of each pile 5 is provided with the bit 19 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 12, in the pile 5 in which the protrusion height of the flange 18 becomes so high that the flange 18 for supporting force increase of each joint 16 becomes the joint 16 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 13, 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 support 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.

  7 to 11 show 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 for penetrating a pile having a hole diameter sufficiently larger than the outer diameter of the pile 5 at the bilaterally symmetrical positions around the vertical wall 1a in the horizontal leg 1b of the inverted T-shaped fabric foundation 1. After providing the opening 4 and driving the pile 5 into the ground through the opening 4 for penetrating the pile, the solidifying material K such as mortar is poured into the opening 4 for penetrating the pile, and then the horizontal plate 9a and the vertical plate 9b The horizontal plate 9a of the L-shaped plate 9 is arranged on the horizontal leg portion 1b of the fabric foundation 1 so as to cover the upper end portion of the opening 4 for penetrating the pile, and the vertical plate 9b is disposed on the side surface of the hanging wall portion 1a. The vertical plates 9b and 9b of the pair of L-shaped plates 9 which are in contact with each other and are in contact with both side surfaces of the vertical wall portion 1a are connected by bolts and nuts 10 penetrating the vertical wall portion. It is.

  In this construction method, if the upper end of the pile 5 driven into the ground protrudes upward from the pile penetration opening 4 of the horizontal leg 1b, the L-shaped plate 9 cannot be attached. It is necessary to excise the upper end protrusion from the opening 4 for penetrating the pile. Further, the L-shaped plate 9 is provided with triangular reinforcing ribs 9c at the corners between the horizontal plate 9a and the vertical plate 9b.

  According to the above-described foundation reinforcing method, the upper end of the pile 5 is integrally coupled to the cloth foundation 1 by the solidifying material K poured into the opening 4 for penetrating the pile, and is attached to the cloth foundation 1. Since the upper end of the pile 5 is supported by the horizontal plate 9a of the plate 9, it is possible to more effectively prevent the cloth foundation 1 from sinking.

  The foundation reinforcement construction method shown in FIG. 8 is the same construction method as the foundation reinforcement construction method described with reference to FIGS. 2 to 6, but is different in that the pile penetration opening 4 is formed in a truncated cone shape. That is, in the construction method shown in FIGS. 2 to 6, the pile penetration opening 4 is cylindrical, but the pile penetration opening 4 in the construction method shown in FIG. It consists of an opening 4T.

  According to this foundation reinforcement construction method, the horizontal leg portion 1b of the fabric foundation 1 is provided with the truncated cone-shaped opening 4 for pile penetration, and after driving the pile 5 into the ground through this opening 4, this pile penetration opening The solidified material K such as mortar is poured into the portion 4 and the upper end of the pile 5 is integrally coupled with the fabric foundation 1 by the solidified material K in the pile-penetrating opening 4, but the pile-penetrating opening 4 is conical. If the fabric foundation 1 is going to sink due to the trapezoidal shape, the solidified material K in the opening 4 causes the upper end of the pile 5 to pass inside the opening 4 due to the wedge effect on the inner peripheral surface of the frustoconical opening 4. In this state, the fabric foundation 1 can be effectively prevented from sinking. Therefore, in this construction method, the upper end of the pile 5 can be effectively coupled to the fabric foundation 1 simply by pouring the solidified material K into the inside of the opening 4 for penetrating the pile.

  The foundation reinforcement construction method shown in FIG. 9 is the same as the construction method of the fabric foundation 1 shown in FIG. 7 except that the pile penetrating opening 4 is formed in a truncated cone shape. . According to this foundation reinforcing method, the upper end of the pile 5 is coupled to the fabric foundation 1 by the solidified material K poured into the opening 4 for penetrating the pile, and the horizontal plate 9a of the L-shaped plate 9 attached to the fabric foundation 1 is used. Thus, the upper end of the pile 5 can be supported and the wedge effect of the inner peripheral surface of the frustoconical opening 4 can be exerted thereon, so that the upper end of the pile 5 can be more effectively coupled to the fabric foundation 1.

  The foundation reinforcement construction method shown in FIG. 10 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 integrated with each other.

  In this construction method, as shown in FIGS. 10 (a) and 10 (b), when the pile 5 is a threaded reinforcing bar, a nut 13 is fixed at a required position at the upper end thereof, and the pile 5 is a steel pipe or a normal reinforcing bar. 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.

  In the foundation reinforcing method shown in FIG. 11, the horizontal leg 1b of the fabric foundation 1 is provided with openings 4 for penetrating the pile at symmetrical positions around the hanging wall 1a, and the pile 5 is placed in the ground from the opening 4. Bolts and nuts penetrating the hanging wall 1a by pouring the solidified material K such as mortar into the opening 4 for penetrating the pile and bringing the reinforcing frames 16 and 16 into contact with both sides of the hanging wall 1a. Both reinforcing frames 16 and 16 are connected and fixed by 10, and a pile receiving plate 17 that covers the upper end portion of the pile penetrating opening 4 and receives the upper end of the pile 5 is attached to the reinforcing frame 16.

  In this construction method, a groove-shaped member is used as the reinforcing frame 16, and the back side of the groove-shaped member is brought into contact with the side surface of the vertical wall portion 1a of the fabric foundation 1, and the bolt / nut 10 is used as shown in FIG. Fix it. Moreover, what is necessary is just to weld the pile receiving plate 17 to the lower flange of a channel shape material. Moreover, the pile receiving plate 17 can be made strong by welding and attaching the reinforcing plate piece 18 between this pile receiving plate 17 and the reinforcement frame 16 which consists of a channel shape material. Further, as shown in FIG. 11 (a), the ground around the fabric foundation 1 to which the reinforcing frame 16 is attached is excavated, and a solidified material K such as mortar is poured into the excavated recess 19. Moreover, as the pile penetration opening part 4 which penetrates the horizontal leg part 1b of the fabric foundation 1, as shown to (a) of FIG. 11 not only in a hole, the side edge part of the horizontal leg part 1b is appropriate size. It may be a notch.

  According to this foundation reinforcing method, the upper end portion of the pile 5 can be firmly bonded to the fabric foundation 1, and when a crack occurs in the hanging wall portion 1 a of the fabric foundation 1, Reinforcement by the reinforcing frames 16, 16 can prevent the vertical wall portion 1a from being broken.

  FIGS. 1 to 11 illustrate a method suitable for reinforcing the fabric foundation 1, but the method shown in FIGS. 1 to 6, the method shown in FIG. 8, and the method shown in FIG. It can be applied to the foundation in almost the same way.

  12 and 13 show a foundation reinforcement method suitable for reinforcing the bundle foundation 11, and FIG. 12 (a) shows the bundle foundation 11 and the bundle 23 of the wooden house supported by the bundle foundation 11, 12 (b) and FIGS. 13 (a) and 13 (b) are cross-sectional views illustrating a method for reinforcing the bundle foundation 11. FIG. A chestnut stone G is disposed below the bundle foundation 11.

  When reinforcing the bundle foundation 11, in the existing house, as shown in FIG. 12 (b), a plurality of piles 5 are arranged around the bundle foundation 11 to be reinforced in FIGS. 1 and 4 (b). The pile driving machine 7 as shown is driven to a predetermined depth reaching the ground support layer (see (b) of FIG. 12). Thereafter, the ground around the bundle foundation 11 is excavated to form a recess 24 that surrounds the bundle foundation 11 and the upper end portion of the pile 5 protruding around the bundle foundation 11. And as shown to (a), (b) of FIG. 8, while arrange | positioning so that several rebar 25 may be bridged between the upper end parts of the pile 5 in this recessed part 24, each rebar 25 is connected to the pile 5 Then, the solidified material K such as mortar is poured into the recess 24, and the bundle foundation 11, the upper end of the pile 5 and the reinforcing bar 25 are integrally connected. Each rebar 25 may be tied to the upper end of the pile 5 with a wire or the like. Further, in FIG. 13, the reinforcing bars 25 are shown in a state of being horizontally stretched over the pile 5, but may be bridged obliquely with respect to the pile 5.

  Thus, the bundle foundation 11 is supported by the pile 5 by integrally connecting the bundle foundation 11 and the upper end portion of the pile 5 and the reinforcing bar 25 with the solidifying material K such as mortar, and the support force of the pile 5 prevents the settlement. Will be.

  14 (a) to 14 (e) show other reinforcing methods for reinforcing the bundle foundation 11. FIG. That is, in this construction method, in the existing house, first, the surrounding ground of the old bundle foundation 11 supporting the bundle 23 is excavated to form a recess 30 surrounding the old bundle foundation 11 ((a ), (B)), the bundle 23 supported by the old bundle foundation 11 is jacked up to a required height, the old bundle foundation 11 is removed from the recess 30, and a plurality of piles are formed from the inside of the recess 30. 5 is driven into the ground to a predetermined depth by a pile driving machine 7 as shown in FIG. 1 (see (c)). Thereafter, concrete is poured into the recess 30 to form a new bundle foundation 11N, and the new bundle foundation 11N and the pile 5 are integrally coupled (see (d) and (e)). It is.

  In this construction method, when the bundle 23 supported by the old bundle base 11 is jacked up, a sandwiching frame 31 for sandwiching the bundle 23 is attached to the bundle 23, and the lower surface both ends of the sandwiching frame 31 and the ground are connected. A hydraulic jack 32 is installed between each. An iron plate 33 is laid on the grounding surface of the jack 32. In addition, a mold is provided when pouring concrete to form a new bundle foundation 11N.

  According to the above-mentioned foundation reinforcing method, when the bundle foundation 11 is damaged, a new bundle foundation 11N can be easily installed, and the new bundle foundation 11N is supported by the pile 5 integrally joined thereto, The support of the pile 5 can prevent the new bundle foundation 11N from sinking.

  Each pile 5 used in the foundation reinforcing method described above is a plurality of piles that are sequentially added and connected via joints 26 as shown in FIGS. 1, 4 to 9, 12, 13, 15, and 16. From the pile member 5a, each joint 26 is screwed into the upper half with the lower male screw portion n of the upper pile member 5a and the upper male screw portion n of the lower pile member 5a with the lower half. A cylindrical main body 27 having a female screw f (see FIGS. 15A to 15C) is formed on the inner peripheral surface. 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. 15 shows the pile 5 in which each pile member 5a is formed of a steel pipe, and FIG. 16 shows the pile 5 in which each pile member 5a is formed of a reinforcing bar. 15A is a front view of the pile 5 in which, for example, the pile 5 made of four steel pipe pile members 5a, and each joint 26 connecting the pile members 5a is made only of the cylindrical body 27, (a ′) Is a plan view thereof. FIG. 15 (b) is a front view of the pile 5 in which the flange 5 for increasing the supporting force protrudes from the center portion of the outer peripheral surface of each joint 26 in the same manner as the pile 5 composed of four steel pipe pile members 5a. , (B ′) is a plan view thereof. FIG. 15 (b) shows a pile 5 composed of four steel pipe pile members 5a. As the supporting force increasing flange 28 of each joint 26 becomes the upper joint 26, the protruding height of the flange 28 increases. The front view of the pile 5 which is attached, (c ') is its plan view.

  FIG. 16A is a front view of a pile 5 in which, for example, the pile 5 is composed of four reinforcing steel pile members 5a, and each joint 26 that connects the pile members 5a is composed only of a cylindrical main body 27, and FIG. It is a top view. FIG. 16B is a front view of the pile 5 in which the flange 5 for supporting force increase is projected from the center portion of the outer peripheral surface of each joint 26 in the same manner as the pile 5 made of four reinforcing steel pile members 5a. , (B ′) is a plan view thereof. FIG. 16 (c) shows a pile 5 made of four reinforcing steel pile members 5a. As the supporting force increasing flange 28 of each joint 26 becomes the upper joint 26, the protruding height of the flange 28 increases. The front view of the pile 5 which is attached, (c ') is its plan view.

  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.

Also, (b), (b '), (c), (c') in FIG. 15 and (b), (b '), (c), (c') in FIG.
As shown in the joint 26, when the support force increasing flange 28 protrudes from the center of the outer peripheral surface of the cylindrical main body 27, when the pile 5 is driven, Since a large upward ground reaction force can be applied, a large supporting force can be obtained.

  Further, like the joints 26 shown in FIGS. 15C and 15C and FIGS. 16C and 16C, the flanges 28 for increasing the supporting force of the joints 26 are connected to the upper joints 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.

  15 and 16 show steel pipes and reinforcing steel piles 5, but the piles 5 used in the construction method of the present invention are screwed over the entire length as shown in FIG. 17 (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 concerning 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). A front view showing a state where the base is jacked up, (b) is a cross-sectional view of the roll line of (a). (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) is a front sectional view showing a state in which the cross member is integrally held on the pile and the reinforcement of the fabric foundation is completed, and (b) is a sectional view of the ho-ho line of (a). FIG. 6 is a front sectional view showing another embodiment of the fabric foundation reinforcing method according to the present invention, and FIG. FIG. 5 is a front sectional view showing another embodiment of the fabric foundation reinforcing method according to the present invention, and (b) is a sectional view taken along the tote line of (a). FIG. 6 is a front sectional view showing still another embodiment of the fabric foundation reinforcing method according to the present invention, and (b) is a sectional view taken along the line of (a). FIG. 5 is a front sectional view showing still another embodiment of the fabric foundation reinforcing method according to the present invention, and (b) is a sectional view taken along the line of (a). FIG. 5 is a front sectional view showing still another embodiment of the fabric foundation reinforcing method according to the present invention, and FIG. (a) is a perspective view showing a bundle foundation and a bundle of wooden houses supported by the bundle foundation, and (b) is a sectional view showing an initial stage of the bundle foundation reinforcing method according to the present invention. (a) is a sectional view showing the next stage of the construction method, and (b) is a sectional view showing the final stage of the construction method. (a)-(e) is explanatory drawing which shows other embodiment of a bundle foundation reinforcement construction method. 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.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cloth foundation 2 Base 5 Pile 5a Pile member 10 Cross member 11 Bundle foundation 16 Joint 17 Cylindrical main body 18 Supporting force increase flange

Claims (13)

  In the existing house, after driving the pile into the ground with a pile driver so that it penetrates the required part of the foundation consisting of the fabric foundation or solid foundation up and down or adjacent to the foundation, this pile is A foundation reinforcement method for existing houses that is integrated with the foundation.   By providing an opening for penetrating a pile sufficiently larger than the diameter of the pile in the required part of the foundation, driving the pile into the ground from this opening, and then pouring solidified material such as mortar into the opening for penetrating the pile, The foundation reinforcing method according to claim 1, wherein the pile is integrally coupled with the foundation.   The horizontal leg of the inverted T-shaped fabric foundation consisting of a vertical wall and a horizontal leg is provided with an opening for penetrating the pile at symmetrical positions on both sides of the vertical wall, and the pile was driven into the ground from this opening After that, a solidified material such as mortar is poured into the opening, and the horizontal plate of the L-shaped plate consisting of a horizontal plate and a vertical plate is placed on the horizontal leg of the fabric foundation so as to cover the upper end of the opening for penetrating the pile. And a vertical plate that is in contact with the side surface of the vertical wall portion, and the vertical plates that are in contact with both side surfaces of the vertical wall portion are connected by bolts and nuts penetrating the vertical wall portion. The foundation reinforcement method described in 1.   The foundation reinforcement construction method according to claim 2 or 3, wherein the pile through-hole has a truncated cone shape with a diameter on the upper end side smaller than that on the lower end side.   After driving a pile into the horizontal leg of the inverted T-shaped fabric foundation consisting of the vertical wall and the horizontal leg so that it is adjacent to the both ends of the horizontal leg at the symmetrical position on both sides of the vertical wall, Excavate the ground near the upper end of the pile, insert two cross members that receive the fabric foundation under the fabric foundation, and sandwich the piles on both sides with both cross members, and the excavated ground The foundation reinforcement construction method according to claim 1, wherein a solidified material such as mortar is poured into the recesses to integrally bond the cloth foundation, the pile and the cross member.   The horizontal leg of the inverted T-shaped fabric foundation consisting of a vertical wall and a horizontal leg is provided with an opening for penetrating the pile at symmetrical positions on both sides of the vertical wall, and the pile was driven into the ground from this opening After that, pour solidified material such as mortar into the opening for penetrating the pile, bring the reinforcing frame into contact with both sides of the hanging wall, and connect both reinforcing frames with bolts and nuts that penetrate the hanging wall and reinforce them. The foundation reinforcement construction method according to claim 1, wherein a pile receiving plate that covers the upper end of the opening for penetrating the pile and receives the upper end of the pile is attached to the frame.   In an existing house, after driving multiple piles around the foundation consisting of a bundle foundation into the ground with a pile driver to the specified depth, excavating the ground around the foundation, A recess surrounding the upper end of the projecting pile is formed, and a plurality of reinforcing bars are bridged between the upper ends of the pile in this recess, and then solidified material such as mortar is poured into the recess to A foundation reinforcement method for existing houses in which piles and reinforcing bars are joined together.   In the existing house, the surrounding ground of the old bundle foundation supporting the bundle is excavated to form a recess surrounding the old bundle foundation, and the bundle supported by the old bundle foundation is raised to the required height. Jack up and remove the old bundle foundation from the recess, and after driving multiple piles into the ground with a pile driver to the specified depth, the concrete is poured into the recess to form a new bundle foundation. A foundation reinforcement method for an existing house that is formed and integrated with the new bundle foundation and pile.   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 9. A cylindrical main body having an inner peripheral surface formed with an internal thread so that the lower end male thread portion of the upper stage pile member is screwed to the upper half and the upper end male thread portion of the lower stage pile member is screwed to the lower half portion. 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 9, 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 9 or 10 with which the bit with the pointed tip part was attached to the lower end part of the lowermost pile member of each pile.   The pile which consists of three or more pile members WHEREIN: As for the flange for supporting force expansion | protrusion protrudingly provided by the cylindrical main body of each joint, the protrusion height of a flange becomes so high that it becomes a joint of the upper stage side. A foundation reinforcement method for existing houses as described in any of the above. Each pile consists of the threaded reinforcing bar or the deformed reinforcing bar which became screw shape over the full length, The foundation reinforcement construction method of the existing house in any one of Claims 1-8.

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