JP2006336414A - Pile head cap, pile head structure of steel pipe pile, structure of building and pile head treating method of steel pipe pile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pile head cap which does not require welding work and smoothing work of a cut face of a pile head and easily treats tilt or core eccentricity of a steel pipe pile and adjusts horizontal level of the pile head, and to provide a pile head structure of the steel pipe pile, a structure of a building, and a pile head treating method of the steel pipe pile. <P>SOLUTION: In the pile head structure 1 of the steel pipe pile, an inner lid 3 is provided inside the pile head 20 of the steel pipe pile 2 driven in the ground, and the pile head cap 4 provided with a plate 40 which covers the pile head 20 of the steel pipe pile 2 and is larger than the pile head 20 and has an injection hole 42 into which a grout material 6 is injected and a cylindrical part 41 which is projected downward from the plate 40 and has an inner diameter slightly larger than a pile diameter of the steel pipe pile 2 is fitted to the pile head 20 of the steel pipe pile 2, and a sealing material 5 fills a gap between a lower end of the cylindrical part 41 of the pile head cap 4 and an outer peripheral surface 21 of the steel pipe pile 2, and the grout material 6 injected from the injection hole 42 is filled between the pile head 20 of the steel pipe pile 2 and the pile head cap 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pile head cap installed on a pile head of a steel pipe pile placed on the ground to improve a soft ground or a built-up ground to support a building such as a house, a pile head structure of a steel pipe pile, and a building The present invention relates to a pile head processing method for steel pipe piles.

  When building a building on soft ground or embankment, in order to prevent uneven settlement and obtain bearing capacity, piles are placed on a solid support layer in the basement. There is a method of supporting a building by peripheral frictional force. Such piles include off-the-shelf piles such as steel pipe piles, and cast-in-place piles that excavate the ground to inject concrete and solidify it, but they support relatively small buildings such as houses. Steel pipe piles that can be driven in without soil and without vibration are frequently used.

  In order to expect the support mechanism of a building to be a steel pipe pile, it is necessary to join the steel pipe pile to the upper structure such as a column or foundation. Conventionally, the upper end of a steel pipe pile that has been gas-cut at a predetermined position, the so-called pile A horizontal plane is formed by welding a pile head plate or the like to the head, and the superstructure is joined on the horizontal plane. However, steel pipe piles are driven vertically downward at a predetermined core position, but in reality, they may be displaced from the core or tilted due to the presence of debris, debris, etc. in the ground or inaccurate construction accuracy. There is a need to take measures against them.

Then, there exists a structure which can process the inclination and misalignment of a steel pipe pile in a pile head (for example, refer patent document 1). In this structure, a misalignment of the pile head of the steel pipe pile is made using a joining jig in which one surface has a flat circular shape, the outer shape is larger than the diameter of the steel pipe pile, and the other surface forms a conical curved surface. Place the welding jig on the pile head of the steel pipe pile so that the flat circular part is horizontal so that it corresponds to the inclination of the steel pipe pile, and the conical curved part becomes the pile head of the steel pipe pile. It welds and the column which is a superstructure is joined on the planar circular part.
JP-A-8-4024

  However, in general, the pile head processing level is often located in the ground, and with the structure of Patent Document 1, the welding posture is deteriorated and the welding work is sometimes difficult. Moreover, although the pile head of a steel pipe pile is cut | disconnected by gas cutting, the cut surface cut | disconnected by gas is inferior in smoothness, and the smoothing operation | work by a grinder etc. is required, and construction work took. Further, it is difficult to ensure vertical accuracy in millimeters in gas cutting, and therefore, a level adjustment work using a spacer or the like is required between the pile head and the upper structure.

  The present invention has been made in view of the above problems, and does not require welding work or smoothing of the pile head cutting surface, can easily handle the inclination and misalignment of the steel pipe pile, and It aims at providing the pile head cap which can adjust a horizontal level, the pile head structure of a steel pipe pile, the structure of a building, and the pile head processing method of a steel pipe pile.

  In order to achieve the above object, the pile head cap according to claim 1 is a pile head cap installed on a pile head of a steel pipe pile driven into the ground, and covers the pile head of the steel pipe pile in a horizontal state. A plate that is larger than the pile head and in which an injection hole into which a curable filler is injected is formed, and a cylinder that protrudes downward from the plate and has an inner diameter slightly larger than the pile diameter of the steel pipe pile And a portion.

  The pile head cap according to claim 2 is the pile head cap according to claim 1, wherein the plate is oval or rectangular in a plan view.

  The pile head cap according to claim 3 is characterized in that, in the pile head cap according to claim 2, the plate and the cylindrical portion are eccentrically attached to the pile head cap.

  The pile head cap according to claim 4 is the pile head cap according to any one of claims 1 to 3, wherein the pile head cap is perpendicular to the cylindrical portion and the plate on an outer peripheral surface side of the cylindrical portion. A stiffener that abuts is provided.

  The pile head cap according to claim 5 is the pile head cap according to any one of claims 1 to 4, wherein the plate has a plurality of injection holes.

  The pile head structure of the steel pipe pile according to claim 6, wherein an inner lid is installed inside the pile head of the steel pipe pile driven into the ground, and the pile head cap according to any one of claims 1 to 5 is the steel pipe pile The time-curable filler filled in the pile head and provided with a sealing material so as to close the gap between the lower end of the cylindrical portion of the pile head cap and the outer peripheral surface of the steel pipe pile, and injected from the injection hole Is filled in a portion surrounded by the pile head of the steel pipe pile, the pile head cap, and the inner lid.

  The structure of the building described in claim 7 is characterized in that the pillar, foundation beam, or cloth foundation of the building is constructed on the pile head structure of the steel pipe pile described in claim 6.

  The pile head processing method of a steel pipe pile according to claim 8, wherein a steel pipe pile cutting step of cutting the pile head of the steel pipe pile driven into the ground at a predetermined level, and an inner lid is installed inside the pile head of the steel pipe pile An inner lid installation step, a plate that covers the pile head of the steel pipe pile, is larger than the pile head, and has an injection hole into which a time-hardening filler is injected, and projects downward from the plate A cylinder head having an inner diameter slightly larger than the pile diameter of the steel pipe pile, and a pile head cap fitting step of fitting a pile head cap to the pile head of the steel pipe pile, and a plate of the pile head cap A sealing material that adjusts the horizontal level and misalignment to temporarily fix the pile head cap, and seals the gap between the lower end of the cylindrical portion of the pile head cap and the outer peripheral surface of the steel pipe pile. A sealing process for providing a curable filler, and a time-curable filler is injected from the injection hole It is characterized in that it comprises, an injection step of filling between the pile head and the pile cap of the steel pipe pile Te.

  According to the pile head cap of claim 1 of the present invention, by installing this pile head cap on the pile head of the steel pipe pile, welding work and smoothing work of the pile head cutting surface are unnecessary, and the inclination of the steel pipe pile And misalignment can be easily handled, and the horizontal level of the pile head can be adjusted.

  According to the pile head cap of claim 2, in addition to the effect of the pile head cap of claim 1, since the plate is oblong or rectangular in plan view, it can cope with misalignment of the steel pipe pile, and Economical member setting is possible.

  According to the pile head cap of Claim 3, in addition to the effect of the pile head cap of Claim 2, since the plate and the cylindrical part are attached eccentrically, it is more effective against misalignment of the steel pipe pile. This makes it possible to set the members more economically.

  According to the pile head cap of claim 4, in addition to the effect of the pile head cap according to any one of claims 1 to 3, the pile head cap is perpendicular to the cylindrical portion and the plate on the outer peripheral surface side of the cylindrical portion. Since the stiffener is in contact with the plate, the thickness of the plate can be reduced, and more economical member setting is possible.

  According to the pile head cap of claim 5, in addition to the effect of the pile head cap according to any one of claims 1 to 4, since the plate has a plurality of injection holes, a plurality of injections at a time. The time-curable filler can be injected from the hole, and the injection hole facilitates the inflow / outflow of air, and the injection process of the time-curable filler can be easily visually confirmed from the injection hole.

  According to the pile head structure of the steel pipe pile according to claim 6, an inner lid is installed inside the pile head of the steel pipe pile driven into the ground, and the pile head cap according to any one of claims 1 to 5 is the steel pipe The time-curing filling that is fitted to the pile head of the pile and provided with a sealing material so as to close the gap between the lower end of the cylindrical portion of the pile head cap and the outer peripheral surface of the steel pipe pile, and is injected from the injection hole Since the material is filled in a portion surrounded by the pile head of the steel pipe pile, the pile head cap and the inner lid, the steel pipe pile and the pile head cap are fixed by a time-hardening filler, and welding work is performed. It is unnecessary. In addition, since the time-hardening filler is filled in the part surrounded by the pile head of the steel pipe pile, the pile head cap and the inner lid, the plate of the pile head cap is not placed directly on the cut surface of the pile head, There is no need to smooth the head cut surface. Furthermore, by installing this pile head cap on the pile head of the steel pipe pile, the inclination and misalignment of the steel pipe pile can be easily handled, and the horizontal level of the pile head can be adjusted.

  According to the structure of the building of claim 7, since the pillar, foundation beam, or cloth foundation of the building is constructed on the pile head structure of the steel pipe pile according to claim 6, the steel pipe pile by the pile head cap Inclination and misalignment are processed, and the building can be supported by reliably transmitting the load from the pillar, foundation beam, or cloth foundation of the building to the steel pipe pile.

  According to the pile head processing method of a steel pipe pile according to claim 8, a steel pipe pile cutting step of cutting the pile head of the steel pipe pile driven into the ground at a predetermined level, and an inner lid inside the pile head of the steel pipe pile Adjusting the horizontal level and misalignment of the pile head plate of the pile head cap, the pile head cap fitting step of fitting the pile head cap to the pile head of the steel pipe pile, A pile head cap adjusting step for temporarily fixing the head cap, a sealing step for providing a sealing material so as to close a gap between the lower end of the cylindrical portion of the pile head cap and the outer peripheral surface of the steel pipe pile, and a temporally curable filler. Including the injection step of injecting from the hole, so that welding work and smoothing work of the pile head cutting surface are unnecessary, the inclination and misalignment of the steel pipe pile can be easily processed, and the horizontal level of the pile head can be increased. Can be adjusted.

Hereinafter, the pile head cap which concerns on embodiment of this invention, the pile head structure of a steel pipe pile, and the structure of a building are demonstrated based on drawing.
FIG. 1 is a cross-sectional view illustrating a schematic configuration of a pile head structure 1 of a steel pipe pile according to the present embodiment. As illustrated, a steel pipe pile 2, an inner lid 3, and a pile head cap that are driven into the ground. 4, the seal material 5, and the grout material (a time-hardening filler) 6.

  The steel pipe pile 2 is a steel pipe pile generally used, and has a necessary diameter and length. In addition, although not shown in figure, the spiral wing | blade and the excavation nail | claw may be provided in the front-end | tip part so that the steel pipe pile 2 may be driven easily.

  The inner lid 3 is a disc-shaped lid for closing the inside of the steel pipe pile 2 and prevents the grout material 6 from flowing into the steel pipe pile 2 when a grout material 6 described later is injected. Is to do. The inner lid 3 is installed inside the pile head 20 of the steel pipe pile 2. The inner lid 3 may be made of other materials such as a synthetic resin in addition to a steel plate, and may be installed by an appropriate method such as welding or bonding with an adhesive.

  Various embodiments of the pile head cap 4 are possible. First, the pile head cap 4 according to the first embodiment covers the pile head 20 of the steel pipe pile 2 as shown in FIGS. 2 and 3. The plate 40 and a cylindrical portion 41 projecting downward from the plate 40 are provided.

  The plate 40 is made of a flat steel plate. The pile head 20 of the steel pipe pile 2 is usually cut so as to be substantially horizontal, and the plate 40 covers the upper end of the pile head 20 in a horizontal state so as to seal the opening of the pile head 20. It becomes. The size of the plate 40 is larger than the pile head 20 of the steel pipe pile into which the pile head cap 4 is fitted. Therefore, when the pile head cap 4 is fitted to the pile head 20 of the steel pipe pile 2, the plate 40 covers the upper end surface of the steel pipe pile 2, and the peripheral edge of the plate 2 is outside the outer periphery of the upper end surface. And the peripheral part of the plate 40 will be in the state which protruded from the upper end of the steel pipe pile 2 to the horizontal direction. Thus, since the plate 40 is larger than the pile head 20 of the steel pipe pile 2, it can respond easily to misalignment. In the present embodiment, as shown in FIG. 3, the plate 40 is a circular flat plate in plan view, but the shape of the plate 40 is not limited to a circle, and other shapes such as a rectangle are adopted. May be. Further, the plate 40 may be made of other materials such as a synthetic resin in addition to the steel plate, and the thickness is appropriately set according to the required strength.

  The cylindrical portion 41 is a cylindrical steel member having an inner diameter slightly larger than the outer diameter of the steel pipe pile 2 and is joined to the lower surface of the plate 40 by welding. The cylindrical portion 41 is long enough to obtain a sufficient frictional force with the grout material 6 after the pile head cap 4 is installed on the pile head 20 of the steel pipe pile 2 and the grout material 6 is injected. Is set. Moreover, the internal diameter and length of the cylindrical part 41 are suitably set so that the inclination of the steel pipe pile 2 can be processed. The cylindrical portion 41 is fitted on the outer periphery of the pile head 20 of the steel pipe pile 2, and the pile head cap 4 is fitted on the pile head 20 of the steel pipe pile 2.

  Moreover, as the pile head cap 4 of 2nd Embodiment, as shown in FIG.4 and FIG.5, while making plate 40 oval in planar view, the plate 40 and the cylindrical part 41 attached eccentrically, and the pile head cap There are four. According to this pile head cap 4, when the position of the pile head 20 of the steel pipe pile 2 and the position of the core are shifted, the core is placed on the plate 40 with the longitudinal direction of the plate 40 facing the position of the core. It can be adjusted to pass through, and more economical member setting is possible by increasing the plate 40 in all directions. In this embodiment, the plate 40 is oval in plan view, but the same effect can be obtained even if it is rectangular. Moreover, in this embodiment, while being oval in plan view, the plate 40 and the cylindrical portion 41 are eccentrically attached, but the pile head cap 4 in only one of the states may be used.

  Furthermore, as the pile head cap 4 of the third embodiment, as shown in FIGS. 6 and 7, a pile head cap 4 provided with a stiffener 43 on the outer peripheral surface of the cylindrical portion or a plurality of injection holes 42 is provided. is there. Thus, since the stiffener 43 can supplement the strength of the plate 40 by providing the stiffener 43 by being brought into contact with the plate 40 and the cylindrical portion 41 so as to be welded, the plate 40 can be set thin and economical. Member setting is possible. Further, by forming a plurality of injection holes 42, it is possible to inject the grout material 6 from the plurality of injection holes 42 at a time, and air is injected from an injection hole 42 different from the injection holes 42 for injecting the grout material 6. The grouting material 6 can be easily injected by flowing in and out, and the grouting material 6 can be easily injected from the injection hole 42 different from the injection hole 42 for injecting the grouting material 6. Cheap. In addition, although the pile head cap 4 of this embodiment is provided with the stiffener 43 and the some injection hole 42, the pile head cap 4 provided only with either may be sufficient.

  The sealing material 5 is for closing a gap between the lower end of the cylindrical portion 41 of the pile head cap 4 and the outer peripheral surface 21 of the steel pipe pile 2, and is generally a caulking material, a sealing material, a tape, etc. used for waterproofing processing. What is necessary is just to be able to prevent the grout material 6 from leaking from the gap between the lower end of the cylindrical portion 41 of the pile head cap 4 and the outer peripheral surface 21 of the steel pipe pile 2.

  The grout material 6 is a filler that has a property of hardening over time. The grout material 6 is injected from the injection hole 42 formed in the plate 40 of the pile head cap 4 and between the steel pipe pile 2 and the pile head cap 4. Filled. An epoxy resin, mortar, or the like is used for the grout material 6, and a material used for the grout material 6 is appropriately selected so that it can cope with a load required for structural design. Moreover, the material of the material excellent in fluidity | liquidity is preferable so that it can be filled also into a fine clearance gap.

  In addition, although this grout material 6 intervenes between the steel pipe pile 2 and the pile head cap 4, the force applied to the pile head cap 4 from the upper structure such as tension and compression is transmitted to the steel pipe pile 2. The outer peripheral surface 21 of the pile head 20 of the pile 2 and the inner peripheral surface of the cylindrical portion 41 of the pile head cap 4 are uneven, or a friction member such as a band is separately installed on the outer peripheral surface 21 of the pile head 20 of the steel pipe pile 2. Thus, after the grout material 6 is hardened, the steel pipe pile 2 and the grout material 6 and the bond strength between the pile head cap 4 and the grout material 6 are increased so that the force applied to the pile head cap 4 is transmitted to the steel pipe pile 2 more. May be.

  In the pile head structure 1 of the steel pipe pile configured as described above, since the upper surface of the pile head cap 4 is fixed in a horizontal state at a predetermined level, various upper structures of the building are formed on the pile head cap 4. The structure 7 of the building joined together can be formed and the load from the superstructure of the building can be transmitted to the steel pipe pile 2. As shown in FIG. 8, as the structure 7 of the building of the first embodiment, the lower end of the steel column 8 which is an upper structure is attached to the pile head cap 4 fitted to the pile head 20 of the steel pipe pile 2. There is a direct bonding structure. In this case, the lower end of the column 8 can be directly joined to the pile head cap 4 by welding. In this way, even if the steel pipe pile 2 is inclined or misaligned, the steel pipe pile 2 has the head structure 1 to handle the inclination and misalignment of the steel pipe pile 2, so that the column 8 is erected on the pile head cap 4. The building structure 7 is formed, and the building load can be reliably transmitted from the column 8 to the steel pipe pile 2 to support the building.

  Moreover, as the structure 7 of the building of 2nd Embodiment, as shown in FIG. 9, the structure which bridges the foundation beam 9 which consists of steel I-shaped steel on the pile head structure 1 of several steel pipe piles is also possible. It is. Also in this case, the lower flange of the foundation beam 9 can be directly joined to the pile head cap 4 by welding. Even in the structure 7 of the building of the second embodiment, as in the first embodiment, even if the steel pipe pile 2 has an inclination or misalignment, the steel pipe pile head structure 1 of the steel pipe pile 2 causes the inclination or misalignment of the steel pipe pile 2. Therefore, the building structure 7 with the foundation beam 9 installed on the pile head cap 4 is formed, and the building load is transmitted from the foundation beam 9 to the steel pipe pile 2 with certainty. I can support it.

  Furthermore, as the building structure 7 of the third embodiment, as shown in FIG. 10, a structure in which a reinforced concrete cloth foundation 10 is placed on a pile head structure 1 of a plurality of steel pipe piles is also possible. In this case, a pile head cap is appropriately performed by laying back the periphery of the steel pipe pile 2 and laying crack stones, etc., laying a normal cloth foundation 10 such as disposing concrete and installing a formwork. The cloth foundation 10 is placed on the steel pipe pile 2 covered with 4. Although not shown, a deformed reinforcing bar or the like may be welded to the upper surface of the plate 40 so as to extend upward to increase the adhesive force with the fabric foundation 10. Even in the structure 7 of the building of the third embodiment, as in the first and second embodiments, even if the steel pipe pile 2 has an inclination or misalignment, the inclination or misalignment of the steel pipe pile 2 is processed. The building structure 7 in which the fabric foundation 10 is placed on the pile head cap 4 is formed, and the building load can be reliably transmitted from the fabric foundation 10 to the steel pipe pile 2 to support the building.

  Hereinafter, the pile head processing method of this steel pipe pile is demonstrated. This method includes a steel pipe pile cutting step, an inner lid installation step, a pile head cap fitting step, a pile head cap adjusting step, a sealing step, and an injection step. Hereinafter, each process will be described.

[Steel pipe pile cutting process]
First, the pile head 20 of the steel pipe pile 2 placed in the ground is cut at a predetermined level by gas cutting or the like. At this time, it is not necessary to finish the cut surface of the pile head 20 smoothly, and the labor of construction can be omitted as compared with the prior art.

[Inner lid installation process]
Next, the inner lid 3 is installed inside the pile head 20 of the steel pipe pile 2. At this time, it installs so that a clearance gap may not arise between the internal peripheral surface of the pile head 20, and the inner cover 3. FIG. This prevents the grout material 6 injected in the injection process from flowing into the steel pipe pile 2.

[Pile head cap fitting process]
Then, the pile head cap 4 is fitted to the pile head 20 from above the steel pipe pile 2 so that the cylindrical portion 41 of the pile head cap 4 is fitted on the outer periphery of the pile head 20 of the steel pipe pile 2. In addition, as above-mentioned, the pile head cap 4 fitted to the pile head 20 may be oval or a rectangle of planar view as mentioned above, and the plate 40 and the cylindrical part 41 are attached eccentrically. Or a stiffener 43 may be provided, or a plurality of injection holes 42 may be formed in the plate 40.

[Pile head cap adjustment process]
After the pile head cap 4 is fitted, the level and level of the upper surface of the plate 40 of the pile head cap 4 are adjusted, and the pile head cap 4 is temporarily fixed by a jig (not shown). Here, the core passes through the plate 40 of the pile head cap 4 to cope with the misalignment of the steel pipe pile 2.

[Sealing process]
The sealing material 5 is provided so as to close the gap between the lower end of the cylindrical portion 41 of the pile head cap 4 and the outer peripheral surface 21 of the steel pipe pile 2. This prevents the grout material 6 injected in the injection process from leaking out of the gap.

[Injection process]
The grout material 6 is injected from the injection hole 42 and the grout material 6 is filled between the pile head 20 and the pile head cap 4 of the steel pipe pile 2. At this time, the grout material 6 may be injected while being vibrated by a vibrator or the like so that the grout material 6 is filled without a gap. Further, when a plurality of injection holes 42 are formed in the plate 40 of the pile head cap 4, the grout material 6 may be injected from the plurality of injection holes 42 at a time. After the grout material 6 is filled, when the grout material 6 is sufficiently cured, the jig that temporarily fixed the pile head cap 4 is removed. And an upper structure is joined on the pile head cap 4 by a predetermined | prescribed process, the structure 7 of a building is formed, the ground is backfilled, and a building is constructed.

  As apparent from the above description, according to the pile head cap 4, the steel pipe pile pile head structure 1, the building structure 7 and the steel pipe pile pile head processing method according to the embodiment of the present invention, the steel pipe pile 2 Since the pile head cap 4 is fixed by the grout material 6, no welding work is required. Moreover, since the grout material 6 is filled between the pile head 20 of the steel pipe pile 2 and the pile head cap 4, the plate 40 of the pile head cap 4 is not placed directly on the cut surface of the pile head 20, and the pile head. The smoothing work by the grinder etc. of 20 cut surfaces is unnecessary, and the work of construction can be omitted. Moreover, since this pile head cap 4 is fitted to the pile head 20 of the steel pipe pile 2 and the level is adjusted and fixed, the inclination of the steel pipe pile 2 can be easily processed and the horizontal level of the pile head 20 is adjusted. it can. Furthermore, since the pile head cap 4 is installed on the pile head 20 of the steel pipe pile 2 that is misaligned within a certain range, and the upper structure of the building is joined to the plate 40 of the pile head cap 4, the steel pipe pile 2 It can cope with misalignment.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, in the present embodiment, the upper structure is joined to the pile head cap 4 after the grout material 6 injected in the injection step has hardened, but the pile head cap 4 is connected to the pile head of the steel pipe pile 2 in the pile head cap fitting step. The upper structure may be joined to the pile head cap 4 after fitting into the pile head, the level adjustment of the pile head cap 4 and the level adjustment of the upper structure may be performed in the same process, and then the sealing process and the injection process may be performed. . In this case, since the level adjustment of the pile head cap 4 and the level adjustment of the upper structure are performed in the same process, one of the entire construction processes can be reduced, and the entire construction period can be shortened and the cost can be reduced.

It is sectional drawing which shows schematic structure of the pile head structure of the steel pipe pile which concerns on embodiment of this invention. It is a perspective view showing an example of a pile head cap concerning a 1st embodiment of the present invention. It is the top view and side view which show an example of the pile head cap which concerns on the 1st Embodiment of this invention. It is a perspective view which shows the pile head cap which concerns on 2nd Embodiment. It is a top view which shows the pile head cap which concerns on 2nd Embodiment. It is a perspective view which shows the pile head cap which concerns on 3rd Embodiment. It is the top view and side view which show the pile head cap which concerns on 3rd Embodiment. It is a side view which shows the structure of the building which concerns on the 1st Embodiment of this invention. It is a perspective view which shows the structure of the building which concerns on 2nd Embodiment. It is a perspective view which shows the structure of the building which concerns on 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pile head structure of steel pipe pile 2 Steel pipe pile 3 Inner lid 4 Pile head cap 5 Seal material 6 Grout material (aging hardening filler)
7 Building Structure 8 Column 9 Foundation Beam 10 Fabric Foundation 20 Pile Head 21 Outer Surface 40 Plate 41 Cylindrical Part 42 Injection Hole 43 Stiffener

Claims (8)

A pile head cap installed on the pile head of a steel pipe pile driven into the ground,
Covering the pile head of the steel pipe pile in a horizontal state, a plate that is larger than the pile head and in which an injection hole into which a time-hardening filler is injected is formed,
A pile head cap comprising: a cylindrical portion protruding downward from the plate and having an inner diameter slightly larger than a pile diameter of the steel pipe pile.   The pile head cap according to claim 1, wherein the plate is oval or rectangular in a plan view.   The pile head cap according to claim 2, wherein the pile head cap is attached with the plate and the cylindrical portion eccentric.   The pile head cap according to any one of claims 1 to 3, wherein the pile head cap includes a stiffener that vertically contacts the cylindrical portion and the plate on an outer peripheral surface side of the cylindrical portion.   The pile head cap according to any one of claims 1 to 4, wherein the plate has a plurality of injection holes. An inner lid is installed inside the pile head of the steel pipe pile driven into the ground,
The pile head cap according to any one of claims 1 to 5 is fitted to the pile head of the steel pipe pile,
A sealing material is provided so as to close the gap between the lower end of the cylindrical portion of the pile head cap and the outer peripheral surface of the steel pipe pile,
The pile head of a steel pipe pile, wherein the time-hardening filler injected from the injection hole is filled in a portion surrounded by the pile head of the steel pipe pile, the pile head cap, and the inner lid. Construction.   A building structure, wherein a building pillar, foundation beam, or cloth foundation is constructed on a pile head structure of a steel pipe pile according to claim 6. A steel pipe pile cutting process for cutting a pile head of the steel pipe pile driven into the ground at a predetermined level;
An inner lid installation step of installing an inner lid inside the pile head of the steel pipe pile;
A plate that covers the pile head of the steel pipe pile, is larger than the pile head, and is provided with an injection hole into which a time-hardening filler is injected, and a pile projecting downward from the plate, A pile head cap fitting step of fitting a pile head cap comprising a cylindrical portion having an inner diameter slightly larger than the diameter to the pile head of the steel pipe pile;
A pile head cap adjustment step of adjusting the horizontal level and misalignment of the plate of the pile head cap and temporarily fixing the pile head cap;
A sealing step of providing a sealing material so as to close a gap between the lower end of the cylindrical portion of the pile head cap and the outer peripheral surface of the steel pipe pile;
An injection step of injecting a time-hardening filler from the injection hole and filling between the pile head of the steel pipe pile and the pile head cap;
The pile head processing method of the steel pipe pile characterized by including.

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