JP3537411B2 - Shaft mortar lining formwork device for deep foundation pile foundation and its construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION In the construction of a shaft for a deep-foundation pile foundation or the like, a formwork used for constructing an earth retaining wall by a mortar lining method for protection of a hole wall of a shaft excavated in the ground. The present invention relates to an apparatus and a construction method thereof.

[0002]

2. Description of the Related Art Hitherto, as a deep foundation pile foundation, a construction method using a cast-in-place mortar lining has been carried out to construct a retaining wall for protecting a hole wall of a shaft excavated in the ground. As this construction method, there is a "construction method for a mortar side wall of a shaft by using an inner shaft device for a shaft and use thereof" disclosed in JP-A-2001-36774. The prior art will be described with reference to FIGS. The inner shaft apparatus 101 for a shaft is alternately arranged with columns 102 standing in a shaft and sliding bodies 103 guided by the columns 102 and slidably driven in the axial direction with respect to the columns 102. In addition, a plurality of first mold pieces 107 and second mold pieces 109 respectively forming a cylindrical mold as a whole, and the support 102 and the first form piece 1 below the support 102 are formed.
07 and the second form piece 109 are movably connected to each other, and the slide body 103 and the first form piece 107 are movably connected above the first link 115. At least two parallel second links 121 which are parallel to each other, and at least two parallel links which movably connect the slide body 103 and the second form piece 109 above the first link 115. The hydraulic jack 1 is provided between the third link 124 which is longer than the second link 121 and the support 102 and the slide body 103.
05, and the slide body 103 is displaced downward or upward relative to the support, whereby the first
The first and second form pieces are advanced and expanded outward to form the cylindrical form 106 via the third link, or the first and second form pieces are retracted toward the inside through the third link. Closed to reduce the diameter of the cylindrical formwork.

[0003]

SUMMARY OF THE INVENTION The above prior art is an inner shaft apparatus for a shaft, which is simple and inexpensive with a small number of parts, is easy to operate, shortens working time and reduces personnel. However, when the mortar lining for earth retaining is formed and the concrete is poured into the shaft and the deep foundation pile foundation is constructed, the mortar lining for earth retaining and the concrete of the body that adhere to the excavation ground are integrated. There is a problem in that the ground resistance against the lifting load and the compressive load (hereinafter, referred to as vertical load) of the deep foundation pile foundation is not sufficient. In addition, there is a problem with the accuracy of centering when erecting a pillar in a shaft,
Mortar lining formed after hole wall earth retaining the shafts, a plurality
When the pair of formwork pieces are retracted and closed, the formed mortar lining and the pair of formwork pieces may damage the mortar lining due to contact with the formwork pieces . There is a problem to be improved, such as a difficulty in changing the mortar lining placement height corresponding to the change in the traveling speed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object the use of an inner shaft apparatus for a shaft which has a small number of parts and has a simple structure. The mortar lining for earth retaining and the integration of the main body substructure are surely secured without impairing the advantages of being inexpensive, easy to operate, and capable of shortening the working time and reducing the number of personnel. An object of the present invention is to provide a shaft mortar lining formwork apparatus for a deep foundation pile which solves the above-mentioned problems, and a method for constructing the same, in order to utilize the foundation body of the mortar lining for fastening.

[0005]

In order to achieve the above object, a shaft mortar for deep foundation pile foundation according to claim 1 of the present invention.
The lining form device includes a column erected in a shaft, a slide body guided by the column and slidably driven in the axial direction with respect to the column, and a cylindrical form as a whole alternately arranged. And a plurality of irregularities of a predetermined shape and size formed at predetermined intervals on the outer surface thereof.
A mold piece forming a pair, a first link is connected to the mold piece forming the struts and a plurality of pairs, each movable in the lower part of the strut, the slide member and the plurality at an upper position of the first link At least two parallel second links that are movably connected to one of the pair of form pieces, and the slide body at a position above the first link.
At least two elongated third links parallel to each other and longer than the second link, the third links being movably connected between the other pair of form pieces and the other form piece ; By disposing a hydraulic jack between them and lowering or raising the slide body relative to the support column, a plurality of pairs of formwork pieces are directed outward through the first to third links. advances expanded toward forming a cylindrical mold, or, more
When the pair of form pieces is retracted and closed inward to reduce the diameter of the cylindrical form , and the mortar lining is formed, when the form apparatus is released, a plurality of pairs are formed at the beginning of the release. A mechanism for horizontally moving the mold piece by a predetermined distance.

According to a second aspect of the present invention, a shaft shaft mortar lining formwork for a deep foundation pile foundation according to the first aspect is provided.
In the apparatus , two stages of mortar injection ports are arranged in the height direction inside a plurality of pairs of mold pieces .

Furthermore, the invention of claim 3 provides a shaft mortar lining type for a deep foundation pile foundation according to claim 1 or 2.
The frame device is characterized in that a fitting hole for fitting with a center pin temporarily provided at the center of the hole bottom of the shaft is provided at a lower end portion of the column standing in the shaft.

According to a fourth aspect of the present invention, there is provided a shaft mortar liner for a deep foundation pile according to any one of the first to third aspects.
A mortar lining method using a ring mold device, (1) a step of drilling a vertical shaft for deep Ishizuekui basis of a predetermined inner diameter, depth ground, (2) the center of the hole bottom of the excavated pit (3) hanging the form device in the shaft and fitting the center pin into a fitting hole at a lower end portion of the column of the form device. (4) a step of forming the cylindrical form by advancing and expanding the plurality of pairs of form pieces of the form apparatus outward, and (5) forming the cylindrical form of the form apparatus. A step of injecting mortar from any one of a plurality of mortar ports in a height direction; (6) after the mortar is solidified,
(7) a step of horizontally moving a plurality of paired form pieces of the form apparatus by a predetermined distance in an initial stage of closing and closing the plurality of form pieces inwardly; Later, the formwork device is reduced in diameter,
It is characterized in that a mortar lining is sequentially formed by repeating the steps (1) to (7) of lifting and removing from a shaft.

[0009]

Embodiments of the present invention will be described with reference to the drawings.

An embodiment of the present invention will be described with reference to the drawings. 1 is a partially cutaway perspective view showing an inner shaft apparatus for a shaft according to the present embodiment, FIG. 2 is a longitudinal sectional view showing a completed state of filling mortar or concrete in the shaft, and FIG.
FIG. 4 is a longitudinal sectional view showing a state in which the mold pieces are drawn inward to reduce the diameter of the mold, and FIG. 5 is a plan view showing the state of FIG.

The inner shaft apparatus 1 for a shaft (hereinafter simply referred to as the apparatus 1) has the following configuration. That is, a conical center pin 28a (positioning member) is temporarily provided at the center of the bottom of the shaft of the shaft 28 (see FIG. 2B), and a concave portion 2a of the same shape provided at the lower end of the column 2 is provided.
The (engaging portion) is engaged with the center pin 28a, and the apparatus 1 is centered on the shaft 28. The shapes of the center pin 28a and the concave portion 2a at the lower end of the column 2 are not limited to conical shapes. As shown in FIGS. 1 and 2, a pipe-shaped slide body 3 is externally slidable in the axial direction on a column 2 that is centered and vertically erected. The top of the slide body 3 is provided with a hook hook 4 for hanging a lifting hook from above. A hydraulic jack 5 is provided inside the top of the slide body 3, and the lower end of the hydraulic jack 5 can be fitted and abutted on the top of the column 2. The hydraulic jack 5 can finely adjust the stop position of the slide body 3 or
It acts so as to slightly pull the plurality of pairs of mold pieces 7 and 9 inward.

As shown in FIGS. 1 to 3, a plurality of pairs of circular arcs are formed around the column 2 and the slide body 3.
The other of the mold pieces forming a plurality of pairs with one mold piece 7 of the mold pieces
Form pieces 9 are alternately arranged with a gap in the circumferential direction,
A hollow cylindrical form 6 as a whole is formed. Then, one mold piece 7 of the two plural form pieces and the other mold piece 9 of the two plural form pieces are arranged to face each other. . Make multiple pairs
One mold pieces 7 of the mold pieces is a wide arc, a plurality of
The other mold piece 9 of the pair of form pieces is a plurality of paired form pieces.
It is a narrow arc that is narrower than one of the mold pieces 7. In state of forming a cylindrical mold 6, the adjacent double
Four key form pieces 11 fill the circumferential gap formed between the number of form pieces 7 and 9. One end of each key mold piece 11 forms the first frame piece 7 or a plurality of pairs.
A hinge 12 is provided inside the other mold piece 9 of the mold piece so as to be openable and closable, and the other end is fixed to an adjacent mold piece by a bolt 13. The detailed structure of this part is not shown.

[0013] On the outer periphery of the cylindrical formwork 6, irregularities are provided with a predetermined shape, a predetermined size, and a predetermined installation interval. The concavo-convex portions 6a are formed at predetermined intervals over the entire circumference including a plurality of pairs of mold pieces 7, 9 and a key mold piece 11. As shown in FIGS. 1 and 2, the lower end of the column 2 and a plurality of pairs of form pieces 7 and 9 are pin-connected by four first links 15 arranged in a cross shape in plan view. ing. Pin connecting portion 1 on the support 2 side of each first link 15
Numeral 4 is connected to be movable and swingable in a horizontal elongated hole 2b provided in the column 2. Make multiple pairs
The respective pin connecting portions 16 on the side of the mold pieces 7 and 9 are swingably connected.

As shown in FIG. 2A, the pin connecting portions 17a, 1 near the center of the slide body 3 and below it.
8a and the corresponding pin connecting portions 17b, 18b on the other mold piece 9 side of the plurality of pairs of mold pieces are connected by three upper and lower third links 24, 24 arranged in parallel. ing. The third links 24, 24 are arranged so as to be inclined downward and outward toward the outside so as to form a parallelogram, and are respectively connected to the pin connecting portions 17a, 18a and 17a.
It is swingably connected at b and 18b. The third links 24, 24 are second links 21, 2, which will be described later.
It is set to be longer than one. Therefore, the descending inclination angles of the third links 24, 24 are large.

On the other hand, as shown in FIGS.
Two upper and lower second links 21 and 21 are arranged in a direction orthogonal to the links 24 and 24 in a plan view, are arranged so as to form a parallelogram, and each pin connection on the slide body 3 side. Molds that make multiple pairs with parts 19a and 20a
Each pin connecting portion 19b, 20b on one mold piece 7 side of the frame piece
Are swingably connected. The second links 21 and 21 are shorter than the third links 24 and 24.
It is set to short. Therefore, the second link 21,
The downward inclination angle of 21 is smaller than the downward inclination angles of the third links 24, 24.

The first to third links 15, 2
The pin connecting portions at both ends of the first and second 24 are detachably connected by bolt pins. Further, in the present embodiment, each of the links 15, 21, and 24 has one pair of the first link 15 and the second and third links 21,
24 shows an example in which two sets of parallel links constitute one set. However, the present invention is not limited to this, and the number of first links 15 and the number of sets of second and third links 21 and 24 are increased. Of course, it may be used.

Further, as shown in FIG. 1, a plurality of pairs are formed.
Filling ports 25 of mortar or concrete 26 are provided at a plurality of upper and lower stages at arbitrary positions in the inner circumferential direction of the mold pieces 7 and 9.

The device 1 having such a configuration operates as follows. When a hook such as a crane (not shown) is hooked on the hook hook 4 and the entire device 1 is suspended by the slide 3, the support 2 itself or a plurality of
Since the pair of form pieces 7, 9 and the like are slid downwardly by the mass of the form pieces 7, 9 and the like, a plurality of form pieces 7 and 9 form a pair inward through the first to third links 15, 21, and 24. It is brought into a state of being contracted and contracted (reduced in diameter). At the time of this contraction displacement (diameter displacement), two second links 21 and 21 and two third links 21 and 21 are used.
Since the links 24 and 24 form parallelograms, respectively, a plurality of pairs of form pieces 7 and 9 move closer to and parallel to the center axis of the slide body 3 at the same time.
The amount of shrinking / closing displacement of the other formwork piece 9 of a plurality of narrow formwork pieces that are pin-connected by the long third links 24, 24 is shorter than the short second links 21, 21. One of a plurality of paired formwork pieces that are pin-connected by
Since it is larger than the amount of closing displacement of the piece 7, a plurality of pairs
The other mold piece 9 of the frame piece is one of the mold pieces forming a plurality of pairs.
The cylindrical form 6 is folded sufficiently small as a whole so as to enter the inside of the form piece 7.

In the initial stage of the contraction displacement, the pin connecting portion 14 of the first link 15 moves in the elongated hole 2b, so that a plurality of pairs of form pieces 7, 9 which move inward in parallel.
Is not restricted (see FIGS. 4, 5 and 13). The first to third links 15, 21, and 24 and the pin connecting portion 14 constitute a mechanism for realizing the parallel movement of the plurality of pairs of form pieces 7, 9 in the initial stage of the closing displacement. According to the first to third links 15, 21, 24 as described above,
Although it is possible to reduce the diameter of the cylindrical form 6 without using the key form 11, a plurality of pairs are formed using the key form 11.
The other formwork piece 9 of the formwork piece is used as one of a plurality of paired formwork pieces.
Since the width is smaller than that of the other mold pieces 7, the cylindrical mold 6 can be further reduced and closed.

The apparatus 1 is suspended, and the recess 2a at the lower end of the column 2 is engaged with a center pin 28a installed at the center of the bottom of the hole of the shaft 28, and the center ring of the column 2 (device 1) is engaged. Do. Furthermore, the slide body 3 for the support 2
Are slid down, the first to third links 15, 21,
A plurality of pairs of form pieces 7 and 9 are expanded via the 4 to form a cylindrical form 6. In the case where the key form piece 11 is not provided, a plurality of adjacent form forms
When there is a gap between the pieces 7 and 9, the hydraulic jack 5 can be operated to eliminate the gap. In the case of the key frame piece 11, the hydraulic jack 5 is operated. Fine adjustment can be made so that the gap between a plurality of pairs of adjacent formwork pieces 7 and 9 matches the width of the key formwork piece 11. In the latter case, the key frame piece 11 rotated with the hinge 12 to seal the gap is fixed with the bolt 13.

Next, according to the placement height of the mortar lining 26 for earth retaining corresponding to the progress of shaft excavation,
The mortar or concrete 26 is filled from one of the filling ports 25 provided in the upper and lower stages and the mortar side wall 2 is filled.
7 (FIG. 3). When the mortar 26 has hardened in about one day, the bolt 13 and the key form piece 11 are removed, and the slide body 3 is slightly lifted by the hydraulic jack 5 to obtain a plurality of pieces.
Separating the mold pieces 7,9 paired from mortar such side wall 27.

A convex portion 6a provided on the outer periphery of the cylindrical form 6
The cross-sectional shape of the recess 6b is trapezoidal, semicircular, or the like, and is not limited to the above-described cross-sectional shape as long as it has a predetermined depth. The horizontal movement of the plurality of pairs of mold pieces 7 and 9 facilitates the removal of the mold at the initial stage of the separation, so that the uneven portion formed on the inner surface of the mortar side wall 27 is damaged. Can be prevented. Thereafter, as shown in FIGS. 4 and 5, the slide body 3 is lifted, and a plurality of pairs are provided via the column 2 and the first to third links 15, 21, 24 that descend relatively to the slide body 3 .
Attracted toward the mold piece 7, 9 on the inside forming a, the entire device is removed outside the vertical shaft 28 while maintaining the reduced diameter state.

FIGS. 8 to 12 show the initial state of the apparatus 1 installed at the bottom of the hole of the shaft 28 when the apparatus 1 is suspended outside the shaft 28.
The steps are shown. In these figures, a parallel short second
Links 21 and 21 and parallel long third links 24 and 2
The presence of 4, mold piece mold piece 7,9 forming a plurality of pairs forms a Chijimi閉(diameter) at a plurality of pairs to be drawn inwardly
The other formwork piece 9 forms a plurality of pairs of one formwork piece
Of a plurality of pairs of formwork pieces that are drawn prior to piece 7
This clearly shows a mode in which the other mold piece 9 is folded inside one mold piece 7 of a plurality of pairs of mold pieces .

FIG. 8 shows a first and a plurality of pairs of formwork pieces 7 and 9.
9 shows a state in which the cylindrical form 6 is formed together with the key form piece 11, and FIG. 9 shows a state in which the key form piece 11 is removed from the cylindrical form 6.

Here, as shown by an arrow P in FIGS. 10 to 12, when the slide body 3 is lifted up against the support 2 which is still grounded on the bottom of the shaft 28, the slide body 3 is elongated. A plurality of pairs connected by third links 24, 24
The other formwork piece 9 of the formwork pieces forms a plurality of pairs connected to the slide body 3 by the short second links 21 and 21.
Since it is drawn inward (toward the center axis of the slide body 3) at a higher speed and with a larger displacement than one of the mold pieces 7 of the mold piece , it is eventually drawn.
The other formwork piece 9 of the plurality of formwork pieces forms a plurality of pairs.
Will be folded inside one of the formwork pieces 7, so that in the final closed state of the plurality of paired formwork pieces 7, 9, the maximum outer diameter of those parts will be It becomes extremely small, and the device 1 does not hit the mortar side wall 27 due to the swinging during the hanging or lifting of the device 1 and damage the side wall 27 or the device 1 itself. Can be carried out very easily.

In the apparatus 1, a plurality of pairs are formed.
The relative sliding action (expansion and contraction action) in the axial direction between the column 2 and the slide body 3 for expanding or contracting the mold pieces 7 and 9 is performed when the slide body 3 is lifted and lowered. The support 2, the slide 3, or a plurality of pairs of form pieces 7, 9, etc., are used under their own weight. However, the mounting of the hydraulic jack 5 is abolished and the top of the support 2 and the top of the slide 3 are connected. Even if they are connected by a hydraulic cylinder device (not shown), the sliding action between the column 2 and the slide body 3 is independent of the lifting and lowering of the slide body 3 and the operation of the hydraulic cylinder device Can be done through

FIGS. 6 and 7 show a second embodiment of the present invention.
This will be described with reference to FIG. 6 and 7 show the shaft 2 of the present embodiment.
8 is a process chart sequentially showing a procedure of applying the mortar side wall 27 in FIG. 8, and the numbers in parentheses indicating the execution procedure match the numbers in O in both figures. (1) The shaft 28 is excavated to a predetermined depth by the excavator heavy machine 30 on the ground on which the inner form device 1 is installed, and the heavy excavator 30 is removed from the shaft 28. (2) Installation and fixing of the inner formwork apparatus 1 The inner formwork apparatus 1 for a shaft is suspended from a crane or the like in the vertical shaft 28 and is fixedly installed. (3) Placing the root-wound mortar 31 The root-wound mortar 31 is filled between the side wall of the shaft 28 and the cylindrical form 6. (4) Removal of Inner Formwork 1 (Working the Next Day) The next day (when the root-wrap mortar 31 is hardened and the side walls 27 are formed), the inner formwork 1 for shaft is removed from the shaft 28. (5) The excavator heavy machine 30 is suspended from the shaft 28, the shaft 28 is excavated to a predetermined depth, and the heavy machine 30 is removed from the shaft 28. (6) Installation and Fixing of the Inner Formwork Device 1 The inner formwork device 1 for a shaft is hung down and fixed by a crane or the like on the shaft 28. (7) Lining Mortar Injection The root mortar 31 is filled and cast between the side wall of the shaft 28 and the cylindrical formwork 6. (8) Removal of Inner Formwork 1 (Working the Next Day) The next day (when the mortar 31 is hardened and the side walls 27 are formed), the inner formwork 1 for shaft is removed from the shaft. (9) The heavy excavator 30 is suspended from the vertical shaft 28, the vertical shaft 28 is excavated to a predetermined depth, and the heavy excavator 30 is removed from the vertical shaft 28. (10) Installation and fixation of the inner formwork apparatus 1 The inner formwork apparatus 1 for a shaft is hung down and fixed to the shaft 28 by a crane or the like. (11) Lining Mortar Injection Root mortar 31 is filled and cast between the side wall of the shaft 28 and the cylindrical formwork 6. (12) Removal of Inner Formwork 1 (Working the Next Day) The next day (when the mortar 31 has hardened and the side walls 27 are formed), the inner formwork 1 for shaft is removed from the shaft 28.

In the second and subsequent times, the cylindrical formwork 6 of the inner shaft form apparatus 1 for vertical shafts is installed by partially pressing the upper part of the cylindrical formwork 6 below the side wall 27 formed previously and pressing lightly. Can be In this way, a shaft 28 having a mortar side wall 27 having a predetermined depth is built. If necessary, it is preferable to assemble a reinforcing bar before lowering and installing the inner shaft apparatus 1 for a shaft. At least, it is preferable that a plurality of reinforcing bars are vertically pierced into the ground at an appropriate depth and the root winding mortar 31 is cast. By doing so, the connection with the mortar side wall 27 previously cast can be strengthened.

[0029]

As apparent from the above description, the present invention has the following effects. <Effect of the invention according to claim 1> Since the cylindrical surface is provided with horizontal irregularities of a predetermined shape and depth on the outer surface of the cylindrical formwork, the inside of the side wall of the mortar lining constructed as earth retaining on the ground wall surface. The unevenness that is formed serves as a shear key at the joint surface between the deep foundation pile body and the skeleton concrete to be cast later, and the joint surface is integrated, and the ground resistance to vertical load is reduced. Significantly improved. This effect can be obtained without impairing the advantages of the conventional technology that the number of components is small, simple and inexpensive, and that the operation is simple, and that the working time and the number of personnel can be reduced. , Mol
When removing the formwork device after forming the tall lining,
Initially, several pairs of formwork pieces are horizontally
As it moves, the irregularities provided on the outer surface of the
The risk of damaging the side wall of the tall lining is eliminated. <Effect of Invention of Claim 2> The same effect as the invention of Claim 1 can be obtained,
Since multiple pairs of mortar inlets are arranged on a pair of formwork pieces , it is easy to respond even if the mortar lining placement height is changed according to the progress of the construction cycle . <Effect of the invention according to claim 3> The same effect as the invention according to claim 1 or 2 can be obtained, and the form can be formed by engaging the column with the positioning member temporarily provided at the center of the hole bottom of the shaft. Can be easily installed concentrically with the shaft, and the mortar lining can be constructed with high accuracy. <Effects of the Invention According to Claim 4> Since the same effects as those of the invention according to any one of claims 1 to 3 are obtained, the mortar lining can be efficiently and economically executed.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an inner shaft device for a shaft according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a completed state of mortar filling in a shaft according to the first embodiment.

FIG. 3 is a plan view showing a mortar filling completion state in the shaft according to the first embodiment.

FIG. 4 is a longitudinal sectional view showing a state in which the mold piece according to the first embodiment is drawn inward and the diameter of the mold is reduced.

FIG. 5 is a plan view showing a state in which the mold piece according to the first embodiment is drawn inward and the diameter of the mold form is reduced.

FIG. 6 is a first half process chart in a construction method according to a second embodiment of the present invention.

FIG. 7 is a process chart of the latter half of the construction method according to the second embodiment.

FIG. 8 is an explanatory view showing a first stage of the operation of the mounting of the first embodiment, where (A) is a front view also serving as a side view,
(B) is a plan view.

FIG. 9 is an explanatory view showing a second stage of the operation.
(A) is a front view also serving as a side view, and (B) is a plan view.

FIG. 10 is an explanatory view showing a third stage of the operation.
(A) is a front view also serving as a side view, and (B) is a plan view.

FIG. 11 is an explanatory view showing a fourth stage of the operation.
(A) is a front view also serving as a side view, and (B) is a plan view.

FIG. 12 is an explanatory view showing a fifth stage of the operation.
(A) is a front view also serving as a side view, and (B) is a plan view.

FIG. 13 is a partially cutaway perspective view showing a conventional vertical shaft inner form device.

FIG. 14 is a longitudinal sectional view showing a completed state of filling mortars in a shaft of a conventional example.

[Explanation of symbols]

Reference Signs List 1 inner shaft device for shaft 2 support column 2a concave portion (engaging portion) at lower end portion of support column 2b elongated hole 3 slide body 4 hook hook portion 5 hydraulic jack 6 cylindrical form 6a convex portion 6b concave portion 7 Forming a plurality of pairs One mold piece 9 of the frame piece 9 The other mold piece 11 of the plurality of paired mold pieces 11 Key mold piece 12 Hinge 13 Bolt 14 Prop side pin connecting part 15 First link 16, 17b, 18b, 19b, 20b Formwork one-side pin connecting portion 17a, 18a, 19a, 20a Sliding body side pin connecting portion 21 Second link 24 Third link 25 Filling port 26 Mortar or concrete 27 Mortar side wall 28 Vertical shaft 28a Center pin (positioning member) 30 Shovel heavy equipment 31 Root mortar

Continued on the front page (72) Inventor Masatoshi Ouchi 1-14 Kanda Iwamotocho, Chiyoda-ku, Tokyo, Japan Shiroishiuchi (72) Inventor Akihiro Kimura 1-14 Kanda Iwamotocho, Chiyoda-ku, Tokyo Shiraishiuchi (56) References JP-A-2001-3674 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 5/01

Claims (4)

(57) [Claims] 1. A column formed in a vertical shaft, a sliding body guided by the column and slidably driven in the axial direction with respect to the column, and a cylindrical form as a whole alternately arranged. And a plurality of pairs having a plurality of irregularities of a predetermined shape and size formed at predetermined intervals on the outer surface thereof.
Formwork pieces , and a plurality of pairs of the pillars at a lower portion of the pillars .
A first link movably connected to a mold piece that forms a pair, and a plurality of pairs of the slide body and the pair at a position above the first link .
At least two parallel second links that are movably connected to one of the mold pieces of the form piece ; and a plurality of pairs of the slide body and the pair at a position above the first link .
At least two long third links parallel to each other and longer than the second link, which are movably connected between the other mold piece and the other mold piece; and between the support and the slide body. A hydraulic jack is disposed on the first and third slides, and the slide body is lowered or raised relative to the support.
Via a link, a plurality of pairs of formwork pieces are advanced and expanded outward to form a cylindrical form , or a plurality of pairs are formed.
Retract and close the formwork piece inward to reduce the diameter of the cylindrical formwork,
After forming the mortar lining, when removing the formwork device, in the initial stage of the removal, a plurality of pairs of formwork pieces are provided with a mechanism for horizontally moving a predetermined distance, for deep foundation pile foundation Shaft mortar lining formwork equipment . 2. A shaft for deep foundation pile foundation according to claim 1, wherein a two-stage mortar injection port is arranged in the height direction inside the plurality of paired formwork pieces. Mortar liner
Formwork equipment . 3. A depth according to claim 1, wherein a lower end portion of said column which is erected in a shaft is provided with a fitting hole for fitting a center pin temporarily provided at a center of a hole bottom of the shaft. Shaft mortar lining formwork for foundation pile foundation. 4. A mortar lining construction method using a shaft shaft mortar lining formwork device for deep foundation pile foundation according to any one of claims 1 to 3, wherein: (2) a step of temporarily installing a center pin having a protrusion at the center of the hole bottom of the excavated shaft, (3) suspending the formwork device in the shaft. Lowering and fitting the center pin into the fitting hole at the lower end of the column of the form device; (4) forwardly expanding the plurality of paired form pieces of the form device outward; A step of opening to form a cylindrical mold; (5) a step of injecting mortar from any one of a plurality of mortar ports in a height direction of the cylindrical form of the mold apparatus; (6) After the cast mortar has solidified,
(7) a step of horizontally moving a plurality of paired form pieces of the form apparatus by a predetermined distance in an initial stage of closing and closing the plurality of form pieces inwardly; Later, the formwork device is reduced in diameter,
Use lifting from shafts, a step of removal, by repeating the steps of (1) to (7), the vertical shaft mortar lining formwork device for shinso piles, characterized in that successively form a mortar lining Mortar lining construction method.