JP2005200879A - Construction method for building foundation and joint board for constructing building foundation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reinforce the pile tip side of a steel pipe pile for connecting and supporting a column of the building structure to and by the pile tip, and connecting and supporting the column of the building structure, without inclining to an installation expected position, even if the axis of the immersed steel pipe pile is axially dislocated and a cutting plane of the pile tip is inclined. <P>SOLUTION: A constructing joint board 1 is installed between the pile tip 61 of the steel pipe pile 6 and a lower end baseplate 71 of the column 7 of the building structure, and the pile tip side 63 of the steel pipe pile 6 is reinforced by an inside reinforcing plate 21 of the constructing joint board 1, by a movement adjustment of an adjusting connecting plate 3 of the constructing joint board 1 and a fine adjustment of a lower clamp 32 threadedly engaging with a screw bar 31 of the adjusting connecting plate 31. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a technique for connecting and supporting a pillar of a building structure to the tip of a pile of steel pipe piles submerged in the ground, and in particular, the center axis of the submerged steel pipe pile causes misalignment and the pillars of the building structure The central axis can be connected and supported to the pile tip of the steel pipe pile at the planned installation position, and even if the cutting plane of the pile tip of the steel pipe pile is inclined, it can be connected and supported to the pile tip of the steel pipe pile without tilting the column of the building structure. Furthermore, the present invention relates to a construction method of a building foundation that reinforces a pile tip side of a steel pipe pile that connects and supports a pillar of a building structure, and a joint board for construction of the building foundation.

As a construction method for building foundations, there is JP-A-11-181790 (Patent No. 3095376). This construction method consists of cutting a steel pipe pile set in the ground to a desired length, fitting a pile head cap fitted with a bolt in the center to the pile tip, and using a pile-side pile base plate with a through hole. After the tip is sandwiched, it is welded to the tip of the pile, the column base plate with the column installed is placed on the bolt, and temporary bolts are inserted into the anchor holes and through holes drilled in the column side base plate to match the through holes. After positioning the pillar by inserting a sandwich plate between both base plates, a temporary bolt is sandwiched by a sandwich plate with a groove notched, and both base plates are fastened with high strength bolts after removing the temporary bolt. .
JP-A-11-181790 (Japanese Patent No. 3095376)

However, when the steel pipe pile is set in the ground, it is almost impossible to set the center of the steel pipe pile at a predetermined position accurately without causing misalignment. The central axis of the set steel pipe pile and the building structure There is a misalignment of about several centimeters between the center axis of the column and the invention disclosed in Japanese Patent Laid-Open No. 11-181790 does not take measures against this misalignment.
In addition, it is difficult to accurately cut the pile tip of the steel pipe pile horizontally, and therefore, it is difficult to horizontally attach the pile side base plate welded to the cut pile tip. Therefore, in the invention of the above-mentioned JP-A-11-181790, in order to horizontally attach the column side base plate to the slightly inclined pile side base plate, an appropriate number of thin sandwich plates are sandwiched between the base plates. Although it is adjusted, it is considered difficult to finely adjust the tilt of 1 mm or less in the field work. On the other hand, even if it is a slight inclination, if the building structure is high, the horizontal shift at a high position appears greatly, and its influence cannot be ignored.
Furthermore, in the invention of JP-A-11-181790, a pile head cap is fitted to the pile tip as a reinforcement on the steel pipe pile side. Since a large bending moment acts by connecting the columns, it is not sufficient to reinforce only the pile tip of the steel pipe pile, and it is considered necessary to simultaneously reinforce the pile tip side, which is the nearest lower side of the pile tip.

  In view of the above-described problems, the present invention was created to solve the problems, and the object of the present invention is to build a steel pipe pile even if the center axis of the steel pipe pile is misaligned. The central axis of the structural pillar can be connected and supported to the pile tip of the steel pipe pile at the planned installation position, and even if the cutting plane of the pile tip of the steel pipe pile is inclined with respect to the horizontal plane, the column of the building structure is not inclined To provide a construction method of a building foundation and a joint board for construction of a building foundation that can be connected and supported at the pile tip of a steel pipe pile, and can further reinforce the pile tip side of a steel pipe pile that supports and supports a column of a building structure. is there.

  In order to achieve the above object, the invention of claim 1 cuts a steel pipe pile set in the ground at a desired length, and places the pile tip side inside the pile tip side inside the pile tip side after cutting the steel pipe pile. Insert the lower side of the internal reinforcement plate of the support plate to be reinforced from the bottom and weld the lower end of the support cylinder of the support plate in which the upper side of the internal reinforcement plate is inserted to the pile pile tip of the steel pipe pile. The upper end of the support projection at the center of the upper surface of the adjustment connecting plate in which a plurality of screw rods are planted on the upper surface of the support plate wider than the support tube on the upper side of the welded and fixed support tube Move the adjustment connecting plate so that it matches the central axis of the column and each screw rod of the adjustment connecting plate matches each screw rod hole formed in the base plate fixed to the lower end of the column of the building structure Fixing while adjusting, each lower clamp on each screw rod planted on the upper surface of the adjustment connecting plate Are screwed together so that the imaginary plane connecting the upper surfaces of the respective lower clamps is a horizontal plane of a predetermined height, and the base plate is lowered and each screw rod is inserted into each screw rod hole of the base plate. After passing through and grounding the lower surface of the base plate to the upper surface of each lower clamp, the upper clamp is screwed into each screw rod and tightened, and each column of the building structure is attached to the pile tip of each steel pipe pile And means for connecting and supporting via a construction joint board composed of the support board and the adjustment connecting plate.

  In order to achieve the above object, the invention of claim 2 is used in the building foundation construction method of claim 1, and the pile tip after cutting the submerged steel pipe pile and the lower end of the column of the building structure. The bottom end of the pillar of the building structure is connected to and supported by the base of the steel pipe pile attached to the base plate fixed to the base plate, and is inserted into the pile front side of the steel pipe pile at the time of construction. A radially arranged internal reinforcing plate that reinforces the tip side from the inside, a support cylinder that is inserted and welded to the pile tip of the steel pipe pile at the time of construction and the upper side of the internal reinforcing plate is inserted upward on the outer peripheral side surface of the support cylinder A support plate having a plurality of external reinforcement plates extending outward, the external reinforcement plate and a flat plate-like support plate that is wider than the support tube, and a lower surface of the base plate at the time of construction. A lower clamp that can be grounded on the top surface and finely adjusted in the height direction. A plurality of screw rods that are screwed to the upper fastening metal fitting to clamp the upper surface of the base plate in cooperation with the partial fastening metal fittings are arranged on the upper surface corresponding to the positions of the screw rod holes formed in the base plate. An adjustment that is installed and has a height adjustable support protrusion with a rounded upper end at the center of the upper surface, and is fixed by moving and adjusting on the surface of the support plate of the support plate according to the planned installation position of the base plate during construction. The connecting plate and at least means comprising the means.

As is clear from the above description, according to the construction method of the building foundation according to the invention of claim 1 and the joint board for construction of the building foundation according to the invention of claim 2, the central axis of the submerged steel pipe pile is installed. Even if the center axis of the pillar of the building structure column at the planned position is misaligned, the adjustment connection plate is moved and adjusted on the support plate of the support plate welded and fixed to the pile tip of the steel pipe pile. The center of the upper surface of the building structure is fixed so that it is aligned with the center axis of the column of the building structure at the planned installation position, and the base plate fixed to the lower end of the column of the building structure is connected to this adjustment connecting plate. The central axis of the column can be connected and supported to the pile tip of the steel pipe pile at the planned installation position.
Moreover, even if the cutting plane of the pile tip of the steel pipe pile is inclined with respect to the horizontal plane, the virtual plane that connects the upper surface of the lower clamp fitting screwed to each screw rod planted on the upper surface of the adjustment connecting plate becomes the horizontal plane. By adjusting as described above, the pillars of the building structure can be connected and supported to the pile tips of the steel pipe piles without tilting. Moreover, by turning the lower clamp, the fine adjustment of the movement of the lower clamp in the vertical direction by the screw motion can be easily performed as compared with the case of adjusting with a thin plate in between.
Furthermore, by inserting the internal reinforcing plate of the support plate into the inside of the pile tip side of the steel pipe pile, the inner peripheral surface of the pile tip side of the steel pipe pile abuts against the radially arranged internal reinforcing plates constituting the support plate. It is possible to reinforce the pile tip side of the steel pipe pile that connects and supports the column of the building structure from the inside side by exhibiting the same function as the reinforcing rib provided directly inside the pile tip side of the steel pipe pile. .

Hereinafter, the present invention will be described more specifically based on the best mode for carrying out the invention described in the drawings.
Here, FIG. 1 is a perspective view of a construction joint board attached between the lower end of the pillar of the building structure and the pile tip of the steel pipe pile, and FIG. 2A is an exploded perspective view of the base plate and the adjustment connecting plate. Fig. 2 (B) is a side view of the adjustment connecting plate, Fig. 3 is a view taken along the line AA of Fig. 1 (Fig. 7), Fig. 4 is a side view of a standard construction state, and Fig. 5 is a misalignment. Fig. 6 is a side view of the construction state when the cut end of the pile tip of the steel pipe pile is inclined, and Fig. 7 is a bottom end of the column of the building structure and the pile tip of the steel pipe pile. It is a perspective view of the joint board for construction of other examples attached between.

  In the figure, the construction joint board 1 used in the construction method of the building foundation is installed between the pile tip 61 after the cut steel pipe pile 6 and the lower end of the column 7 of the building structure. 6 is a member for connecting and supporting the lower end of the pillar 7 of the building structure to the pile tip 61 of the building 6, and is inserted into the pile tip side inside 62 of the steel pipe pile 6, and the pile tip side 63 that becomes the lower side of the steel pipe pile 6 immediately near the pile tip side. A support provided with an internal reinforcing plate 21 to be reinforced, a support tube 22 welded to a pile tip 61 of the steel pipe pile 6, an external reinforcing plate 23 extending upward, and a support plate 24 at the top of the support tube 22. The upper surface of the screw rod 31 on which the lower fastening bracket 32 and the upper fastening bracket 33 are screwed together is adjusted by movement on the surface of the support plate 24 according to the planned installation position of the lower end of the column 7 during construction. Adjusted connection with support projection 34 in the center of the upper surface 3 mainly consists of.

  The support plate 2 is composed of an internal reinforcing plate 21, a supporting cylinder 22, an external reinforcing plate 23, and a supporting plate 24, and is welded to a pile tip 61 after cutting of the steel pipe pile 6 in which the lower end of the supporting cylinder 22 is sunk. The adjustment connecting plate 3 is fixed to the support plate 24 on the upper portion of the support cylinder 22 by the base plate 71 at the lower end of the column 7 of the building structure by bolts 35 or welding described later. The support board 2 is located between the base plate 71 at the lower end of the column 7 of the building structure and the pile tip 61 of the steel pipe pile 6 and supports the entire load of the building structure on the pile tip side 63 of the steel pipe pile 6. Play the role of escape.

  The internal reinforcing plate 21 is a portion that is inserted into the pile tip side inside 62 after the cut steel pipe pile 6 is cut, and is a vertical steel plate that is radially arranged from the center toward the periphery when viewed from the bottom surface. It is composed of Each of the steel internal reinforcing plates 21 constituting the support plate 2 has the pile tip side 63 of the steel pipe pile 6 against the bending moment acting on the pile tip side 63 of the steel pipe pile 6 near the pile tip. 6 functions to reinforce from the inside.

  That is, a force that deforms the pile tip side 63 of the steel pipe pile 6 by a bending moment acts on each of the steel internal reinforcing plates 21 that are radially arranged to constitute the support plate 2, and the inner peripheral surface of the pile tip side 63. Is in contact with the front end 21a of each internal reinforcing plate 21, but each internal reinforcing plate 21 resists this and exhibits a function equivalent to the reinforcing rib provided directly on the pile tip side inside 62 of the steel pipe pile 6, The pile tip side 63 of the steel pipe pile 6 is prevented from being deformed. That is, each internal reinforcement board 21 reinforces the pile front end side 63 of the steel pipe pile 6 from the inner side of the steel pipe pile 6 by increasing the rigidity of the pile front end side 63 of the steel pipe pile 6.

  In the figure, for example, the internal reinforcing plate 21 is arranged in a cross shape in four directions at equal angles in the circumferential direction from the center. However, for example, it may be arranged in six directions or eight directions at equal angles from the center. . For example, the internal reinforcing plate 21 arranged in a cross shape is welded to the lower surface of the support plate 24 of the support plate 2 whose upper end is located above. The inner reinforcing plate 21 is welded to the inner peripheral side surface of the support tube 22 at the upper side of the side end.

  The diameter of the steel internal reinforcing plate 21 that is radially arranged from the center toward the periphery is slightly smaller than the inner diameter of the pile tip side inside 62 of the steel pipe pile 6 to be inserted, and the pile tip side inside 62 of the steel pipe pile 6 is inserted. It is designed to be inserted smoothly. In addition, each of the steel internal reinforcing plates 21 arranged radially is inclined at a lower end obliquely downward from the periphery toward the center, and is formed into a mountain-shaped taper downward. The shape is easy to insert into the side interior 62.

  The lower end of the support cylinder 22 into which the upper side of the internal reinforcing plate 21 is inserted is welded to the cut pile tip 61 of the steel pipe pile 6. The support cylinder 22 is formed of a steel cylindrical plate, and the lower end of the circular peripheral edge thereof is welded and fixed to the circular peripheral edge of the pile tip 61 scheduled to be cut horizontally of the steel pipe pile 6. The periphery of the lower end of the support cylinder 22 is fixed by welding to the periphery of the pile tip 61 of the steel pipe pile 6 by butt welding. The support cylinder 22 functions to support a load acting through the column 7 of the building structure and directly transmit the load to the pile tip side 63 of the steel pipe pile 6.

  On the outer peripheral side surface of the support tube 22, steel external reinforcing plates 23 are disposed radially from the center of the support tube 22 toward the periphery. Each external reinforcing plate 23 is fixed by welding one vertical end thereof to the outer peripheral side surface of the support tube 22. Each of the external reinforcing plates 23 has an inverted pyramid shape in which the protruding length from the outer peripheral side surface of the support cylinder 22 extends upward. Each external reinforcing plate 23 reinforces the support cylinder 22 from the inside and outside in cooperation with the internal reinforcing plate 21 to increase its rigidity.

  In the figure, for example, the external reinforcing plates 23 are radially arranged in eight directions at an equal angle of 45 degrees in the circumferential direction from the center of the support cylinder 22, but each external reinforcing plate 23 has a protruding length outward. Every other one is alternately longer and shorter. That is, the external reinforcement plate 23 having a long overhang length is arranged in a cross shape at an equal angle of 90 degrees, and the external reinforcement plate 23 having a short overhang length is shifted by 45 degrees in the middle of the cross-shaped arrangement. It is arranged in a cross shape.

  Each of the external reinforcing plates 23 having a long overhang length has the same length on the lower end side, but the overhang lengths differ upward. That is, the external reinforcement plate 23 having a longer overhang length has a longer overhang length, and the external reinforcement plate 23 having a shorter overhang length has a shorter overhang length. The side end of each external reinforcing plate 23 on the projecting side is inclined linearly forward and obliquely upward.

  A flat plate-like support plate 24 is welded and fixed to the upper side of the support cylinder 22 and each external reinforcing plate 23. The support plate 24 has, for example, a square shape when seen from the plane, and the upper end of the external reinforcing plate 23 arranged in a cross shape with a longer overhang at the diagonal position of the square on the lower surface of the support plate 24 is welded. ing. Further, the upper end of the external reinforcing plate 23 that is arranged in a cross shape with a shorter overhang is welded to the position of a cross line that connects the midpoints of two opposite sides of the square on the lower surface of the support plate 24.

  The length of one side of the support plate 24 having a square shape, for example, located at the upper portion of the support plate 2 is several times the diameter of the circular support tube 22 located at the lower portion of the support plate 24, and the support plate 2 faces upward. It has an inverted pyramid shape that expands toward it. The reason why the upper support plate 24 is made wider than the lower support cylinder 22 is to cope with the misalignment of the central axis h of the steel pipe pile 6 that has been laid due to manufacturing errors and construction errors of the building structure. is there.

  That is, due to manufacturing errors and construction errors, the central axis k of the column 7 of the building structure does not coincide with the central axis h of the pile tip 61 of the steel pipe pile 6, and the central axis k of the column 7 of the building structure is the steel pipe pile. 6 from the position of the center axis h of the pile tip 61 of the six piles, but it is displaced in any direction of 360 degrees in all directions. The upper support plate 24 is made wider than that shown in FIG.

  The adjustment connecting plate 3 plays a role of connecting and fixing the column 7 of the building structure to the support board 2 by adjusting the horizontal shift and inclination, and is located at the position of the central axis k of the column 7 of the building structure. After the position of the upper surface center 3a of the adjustment connecting plate 3 is moved and adjusted to coincide with each other, it is fixed on the surface of the support plate 24 on the upper side of the support plate 2 by bolts 35 described later or welding.

  The adjustment connecting plate 3 has a flat plate shape made of steel having the same shape as the base plate 71 fixed to the lower end of the column 7 of the building structure, and a plurality of screw rods formed on the base plate 71 on the upper surface thereof. A plurality of screw rods 31 are vertically planted at locations corresponding to the positions of the holes 72. For example, the screw rod 31 is planted by screwing the root side into a screw hole drilled downward on the upper surface of the adjustment connecting plate 3, but may be planted by welding.

  A screw thread is spirally formed on the side peripheral surface of each screw rod 31. The screw rod holes 72 formed in the base plate 71 at the lower end of the column 7 of the building structure are generally formed at equal intervals on the peripheral side of the central column 7 portion. For this reason, the screw rod 31 is also an adjustment connecting plate. 3 are planted at equal intervals on the peripheral side of the center of the surface. For example, a high tension bolt is used for the screw rod 31.

  Each screw rod 31 implanted on the surface of the adjustment connecting plate 3 is screwed with a lower fastening bracket 32 and an upper fastening bracket 33 on the lower side and the upper side with a base plate 71 to be fitted interposed therebetween. The The lower tightening bracket 32 and the upper tightening bracket 33 are formed in an annular shape, and a spiral thread corresponding to the thread on the side peripheral surface of the screw rod 31 is formed on the inner peripheral side surface of the central through hole. .

  When the lower surface of the base plate 71 is directly grounded to the upper surface of each lower clamp 32, each lower clamp 32 directly supports the load acting through the column 7 of the building structure and supports the side of the support board 2 through the screw rod 31. Fulfills the function of communicating to That is, the plurality of lower clamps 32 are formed by engaging the threads on the inner peripheral side surfaces of the through holes of the plurality of lower clamps 32 and the screw threads on the side peripheral surfaces of the screw rods 31. The load can be supported.

  Moreover, since the lower clamp 32 is screwed to the screw rod 31, it can be slightly moved in the vertical direction by slightly turning in either direction, and the height of the lower clamp 32 can be finely adjusted. It is. For this reason, when the surface of the adjustment connecting plate 3 is inclined and not horizontal, the height of the lower fastening bracket 32 screwed to each screw rod 31 is finely adjusted so that the upper surface of the lower fastening bracket 32 is horizontal. Can be adjusted.

  In the upper clamp 33, the base plate 71 of the column 7 of the building structure supported by being grounded on the upper surface of the lower clamp 32 is moved upward by an upward external force due to the action of vibration or bending moment. It functions to prevent it from coming off. That is, the plurality of upper tightening brackets 33 are external forces that act upward by engaging the threads on the inner peripheral side surface of the through holes of the plurality of upper tightening brackets 33 with the screw threads on the side peripheral surface of the screw rod 31. Can resist.

  The adjustment connecting plate 3 attached to the surface of the support plate 24 on the upper side of the support plate 2 may be fixed slightly tilted without being horizontal due to construction errors. For this reason, the center 3a of the base plate 71 in the horizontal state, even if it is slightly tilted in any of all directions around the upper surface center 3a of the adjustment connecting plate 3 in which the screw rods 31 are implanted on the peripheral side, is provided. A support projection 34 is provided to adjust the height.

  The support projection 34 has, for example, a rod-like shape, and a screw thread is formed in a spiral shape on the side peripheral surface thereof, and a screw hole is formed in the upper surface center 3a of the adjustment connecting plate 3 downward. The lower side of the protrusion 34 is screwed to adjust the height. The upper end side of the support protrusion 34 with which the lower surface of the base plate 71 contacts is rounded, and the support protrusion 34 is inclined relative to the base plate 71 in any direction of 360 degrees. It can be supported in the state.

  As described above, the adjustment connecting plate 3 is fixed to the surface of the upper support plate 24 of the support plate 2 by bolts 35 or welding. The screw hole 35a for screwing and inserting the bolt 35 is formed in the vertical direction. The lower side of the bolt 35 is screwed into the screw hole 35 a and is screwed into a screw hole 23 a drilled in the field on the lower support plate 24, so that the adjustment connecting plate 3 is attached to the support plate 24. The structure is fixed.

Next, the construction method of the building foundation using the construction joint board will be described below.
The steel pipe pile 6 is set in the ground at a predetermined position by using a machine that sets the pipe 6 to a predetermined depth. The steel pipe pile 6 that has been laid may not be straightly laid but may be slightly tilted or shifted in position depending on the construction state or the ground condition at the time of placing. The earth and sand around the pile tip side 63 of the steel pipe pile 6 set in the ground is removed. This is to make it easier to work when the pile tip side 63 is joined by horizontal cutting and welding. Moreover, it is because the pile front-end | tip 61 of the steel pipe pile 6 to be cut | disconnects will be in a position slightly lower than the ground generally.

  Using a cutting machine, the pile tip side 63 of the steel pipe pile 6 is horizontally cut by a desired length. This cutting operation is an on-site operation, and it is difficult to accurately perform horizontal cutting as in a factory cutting operation, and an inclination error tends to occur.

  The construction joint board 1 is attached to the pile tip 61 of the cut steel pipe pile 6. The construction work of the construction joint board 1 is carried out by inserting the lower side of the internal reinforcing plate 21 of the construction joint board 1 into the pile front end 62 and then inserting the support cylinder 22 into which the upper side of the internal reinforcing board 21 is inserted into the pile front end. The construction joint board 1 is fixed to the pile tip 61 of the steel pipe pile 6 by attaching to the 61 and welding and fixing the lower edge of the support cylinder 22 along the circumference of the pile tip 61.

  When the pile tip 61 of the steel pipe pile 6 is cut horizontally, the construction joint board 1 can be mounted horizontally on the pile tip 61 of the steel pipe pile 6. However, when the cutting plane of the pile tip 61 of the steel pipe pile 6 is slightly inclined with respect to the horizontal due to the steel pipe pile 6 being inclined slightly and being set, or due to an error during cutting, The construction joint board 1 cannot be mounted horizontally on the pile tip 61 of the steel pipe pile 6, and the construction joint board 1 is attached in a slightly inclined state. Further, when the central axis h of the steel pipe pile 6 is shifted in any direction in the horizontal direction, the central axis h of the construction joint board 1 is also shifted in the same state as the steel pipe pile 6.

  After fixing the construction joint board 1 to the pile tip 61 of the steel pipe pile 6, the adjustment connecting plate 3 is attached to the surface of the support plate 24 at the top of the construction joint board 1. When the central axis h of the construction joint board 1 is shifted due to the measurement, the misalignment is adjusted by the adjustment connecting plate 3. That is, the adjustment coupling plate 3 is placed on the surface of the support plate 24 so that the upper end of the support projection 34 provided at the upper surface center 3a of the adjustment coupling plate 3 coincides with the central axis k of the column 7 of the building structure to be installed. Adjust the slide movement. In this case, the upper end of the support projection 34 is set so that the height of the base plate 71 at the lower end of the column 7 grounded to the upper end of the support projection 34 provided at the center 3a of the upper surface of the adjustment connecting plate 3 becomes a predetermined height. Fine tune the height. Further, the position of each screw rod 31 of the adjustment connecting plate 3 is moved and adjusted while being aligned with each screw rod hole 72 formed in the base plate 71 at the lower end of the column 7.

  The adjustment coupling plate 3 is slid and adjusted on the surface of the support plate 24, and the upper end of the support projection 34 provided on the upper surface center 3a of the adjustment coupling plate 3 is set to the central axis k of the pillar 7 of the building structure at the predetermined position. After matching, the adjustment connecting plate 3 is fixed to the surface of the support plate 24. As a fixing method, as described above, the fixing is performed by the bolt 35 or welding.

  In the case of fixing with the bolt 35, the position of the screw hole 35a drilled on the peripheral side of the adjustment connecting plate 3 is marked at the corresponding position of the support plate 24, and the support plate is used on the site using a screw hole machine. After forming the corresponding holes 24 and forming screw holes, the bolts 35 are screwed into the screw holes 35a of the adjustment connecting plate 3 and the lower side thereof is screwed into the screw holes of the lower support plate 24. The adjustment connecting plate 3 is fixed to the surface of the support plate 24. In the case of welding, the peripheral edge of the adjustment connecting plate 3 is welded and fixed to the surface of the support plate 24.

  A lower clamp 32 is screwed onto each screw rod 31 planted on the surface of the adjustment connecting plate 3, and a virtual plane connecting the upper surfaces of the lower clamps 32 is measured to a horizontal plane with a predetermined height. Make fine adjustments while turning each lower clamp 32 so that Since each lower clamp 32 is only slightly moved up and down by screw motion during one rotation, fine adjustment is possible.

  Thereafter, the base plate 71 fixed to the lower end of the column 7 of the building structure is lowered from above, and the screw rods 31 on the surface of the adjustment connecting plate 3 are relatively moved to the screw rod holes 72 formed in the base plate 71. The base plate 71 is attached on the adjustment connecting plate 3 by being inserted. After the screw rods 31 of the adjustment connecting plate 3 are inserted into the screw rod holes 72 of the base plate 71, the upper fastening brackets 33 are screwed into the screw rods 31 and tightened. The pillars 7 of the building structure are connected and supported to the pile tips 61 of the steel pipe piles 6 via the construction joint board 1 by being clamped and supported by the fastening metal fittings 32 from above and below.

  As described above, after connecting and supporting the upper end of each steel pipe pile 6 via the construction joint board 1 of each column 7 of the building structure, the screw rod 31 and the lower fastening bracket 32, the upper part, as necessary. The fastening bracket 33 is covered with non-shrinkable concrete. The reason for covering with concrete is to avoid the corrosion of the screw rod 31, the lower fastening fitting 32, and the upper fastening fitting 33. Finally, the earth and sand around the pile tip 61 of the steel pipe pile 6 is backfilled.

  Note that the present invention is not limited to the best mode for carrying out the invention, and various modifications can be made without departing from the spirit of the invention.

It is a perspective view of the construction joint board attached between the lower end of the pillar of the building structure which shows the best form for implementing this invention, and the pile front-end | tip of a steel pipe pile. (A) is an exploded perspective view of a base plate and an adjustment connecting plate showing the best mode for carrying out the present invention. (B) is a side view of an adjustment connecting plate showing the best mode for carrying out the present invention. It is an AA arrow line view of FIG. 1 (FIG. 7). It is a side view of the standard construction state which shows the best form for implementing this invention. It is a side view of the construction state in the case of causing misalignment showing the best mode for carrying out the present invention. It is a side view of the construction state in case the cut surface of the pile tip of the steel pipe pile which shows the best form for implementing this invention inclines. It is a perspective view of the construction joint board of the other example attached between the lower end of the pillar of the building structure which shows the best form for implementing this invention, and the pile front-end | tip of a steel pipe pile.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Construction joint board 2 Support board 21 Internal reinforcement board 21a Front end 22 Support cylinder 23 External reinforcement board 24 Support board 3 Adjustment connection board 3a Upper surface center of adjustment connection board 31 Screw rod 32 Lower clamp 33 Upper clamp 34 Support Projection 35 Bolt 35a Screw hole 6 Steel pipe pile 61 Pile tip 62 Pile tip side inside 63 Pile tip side 7 Pillar of building structure 71 Base plate 72 Screw rod hole h Central axis of steel pipe pile, central axis of construction joint board k Building Center axis of structure pillar

Claims (3)

Cut the steel pipe pile set in the ground to the desired length, and insert the lower side of the internal reinforcement plate of the support plate that reinforces the pile tip side from the inside to the pile tip side after cutting the steel pipe pile A support plate wider than the support cylinder on the upper side of the support cylinder in which the lower end of the support cylinder of the support plate into which the upper side of the internal reinforcing plate is inserted is welded and fixed to the pile tip of the steel pipe pile. Each screw of the adjustment connecting plate so that the upper end of the support projection at the center of the upper surface of the adjustment connecting plate in which a plurality of screw rods are planted on the upper surface coincides with the center axis of the pillar of the building structure at the planned installation position. The adjustment connecting plate was fixed while moving and adjusted so that the rod matched with each screw rod hole formed in the base plate fixed to the lower end of the pillar of the building structure, and was planted on the upper surface of the adjustment connecting plate A virtual plane that connects each lower clamp to each screw rod and the upper surface of each lower clamp The base plate is lowered and threaded into each screw rod hole of the base plate, and the lower surface of the base plate is attached to each lower fastening bracket. After grounding to the upper surface of the steel, the upper clamps are screwed onto each screw rod and tightened, and each pillar of the building structure is constructed from the above support plate and the adjustment connecting plate at the pile tip of each steel pipe pile A construction method for building foundations, which is connected and supported via a joint board. It is used in the construction method of the building foundation of claim 1 and is attached between the pile tip after cutting of the laid steel pipe pile and the base plate fixed to the lower end of the column of the building structure. An internal reinforcing plate that is inserted into the pile tip side of the steel pipe pile at the time of construction and arranged radially to reinforce the pile tip side of the steel pipe pile from the inside, and the inside A support cylinder inserted into the pile tip of the steel pipe pile at the time of construction when the upper side of the reinforcement plate is inserted, a plurality of external reinforcement plates extending outwardly upward on the outer peripheral side surface of the support cylinder, and the external reinforcement plate, A support plate provided on the upper portion of the support tube with a flat plate-like support plate wider than the support tube; and a lower fastening bracket capable of finely adjusting the height direction by supporting the lower surface of the base plate on the upper surface during construction. The upper side of the base plate is clamped in cooperation with the lower fastening bracket. A plurality of screw rods to be screwed to the fastening brackets are installed on the upper surface corresponding to the positions of the screw rod holes formed in the base plate, and the height adjustable support projection with the upper end rounded at the center of the upper surface For construction of a building foundation characterized by comprising at least an adjustment connecting plate that is moved and adjusted on the surface of the support plate of the support plate in accordance with a planned installation position of the base plate at the time of construction. Joint board. When the adjustment connecting plate is fixed to the surface of the support plate with bolts, a plurality of bolt screw holes for fixing the adjustment connecting plate to the surface of the support plate with bolts are formed on the peripheral side of the adjustment connecting plate. The building foundation construction joint board according to claim 2, wherein the screw holes for the bolts are formed in the support plate at locations corresponding to the positions of the screw holes of the adjustment connecting plate.

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