JPH07207661A - Pile head treatment method of cast-in-place pile and arrangement jig of static expansion chemical crushing agent - Google Patents

Abstract

PURPOSE:To facilitate pile head treatment by placing a second crushing agent between a first static expansion chemical crushing agent placed circularly to a crushing planning line of apile head. CONSTITUTION:A first static expansion chemical crushing agent 15 having normal expansion revealing time is mounted along the lower surface of a double ring 12 of an arrangement jig 10, a second static expansion chemical crushing agent 16 having expansion revealing time longer than normal one is loaded to a position along a vertical bar 14 and four vertical bars 14', and a second expansion crushing agent 15' surrounded by the bars 14' on the upper surface of a ring 12' is horizontally mounted. After that, ready-mixed concrete is placed in a pile hole H, a square pipe 25 interlocking a hook of a depressed jig 20 with a horizontal bar 12' of the jig 10 is connected to a hydraulic ram, and the jig 10 is pushed down until a bottom frame body 11 reaches a planned crushing level. Then, the head of solidified concrete C is cut horizontally by the crushing agent, and the head crushed in a segment-shape by the crushing agent 16 is further crushed by the crushing agent 15' in the middle part of the height in the horizontal direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a method for treating a pile head of a cast-in-place pile with a static expansion crushing agent, and a mounting jig for mounting the static expansion crushing agent used in this method. Suitable for construction on a small scale, after the concrete is placed in the pile hole, while the concrete is in a soft state before hardening, the static expansion crushing agent (hereinafter simply referred to as expansion crushing agent)
Is placed at the planned crushing position, and when the concrete hardens, it is crushed and the pile head is treated, and the pile head treatment method for low-pollution cast-in-place piles and the expansion crushing agent are placed at that position. The present invention relates to a disposing jig to be left, a processing method and a depressing jig that can be lifted and recovered by leaving only the expansive crushing agent after disposing the disposing jig.

[0002]

2. Description of the Related Art Pile used as a foundation for building a building is to insert a frame into the ground or inject bentonite solution to excavate a pile hole while preventing collapse of the hole wall. When the drilling of the hole is completed, insert the reinforcing bar cage into this pile hole,
So-called cast-in-place piles are used for pouring ready-mixed concrete into pile holes. When pouring a slurry such as bentonite, those slurries remain at the bottom of the pile hole, and since earth and sand and other foreign matter remain at the bottom of the pile hole, pouring raw concrete from above will result in slurry and earth and sand. Is pushed by the gravity of the fresh concrete that is sequentially poured in from the top, one part floats in the fresh concrete and disperses in the middle of the pile hole, and one part remains at the bottom of the pile hole. Since the concrete hardens, the quality of the concrete at the bottom of the pile hole and in the middle portion deteriorates, the strength of the pile decreases, and the entire pile becomes unusable. As a means to prevent the deterioration of the quality of concrete due to the mixing of slurry, earth and sand, etc., a long and narrow tube called the Tremi tube is placed at the axial center of the pile hole, and its tip is close to the bottom of the pile hole and keeps a predetermined distance. Vertically inserted to the position, injected fresh concrete from the upper end opening of the tremie pipe and let it out from the lower end opening, and raise the fresh concrete injected through the tremie pipe along the outer periphery of the tremie pipe, The Tremy tube is withdrawn after the injection is complete. In this way, the slurry and earth and sand at the bottom of the pile hole are replaced with fresh concrete that is spited out one after another from the lower end opening of the tremie pipe and moved to the upper part of the pile hole, and the slurry and earth and sand are included. Cut off the head part of poor quality raw concrete,
Use the remaining good parts as piles. As mentioned above, the part formed in the upper part of the pile hole and having deteriorated quality is called "pile head surplus defective concrete part", and this "pile head surplus defective concrete part" is crushed by the pile head. The length of the entire concrete pile to be placed is determined by setting the position to be removed in advance, but in reality it includes the concrete part with defective pile head surplus and the part adjacent to the defective concrete part for safety. The crushing and removing position is called a crushing plan line or a planned crushing level. Conventionally, a method of crushing and removing the pile head by using a breaker has been adopted as a pile head treatment method for crushing the overfilled concrete portion (hereinafter referred to as pile head) of the cast-in-place pile. However, in addition to environmental problems such as noise and vibration, it has the drawback of low work efficiency.
As an alternative to the general method for treating pile heads with less noise and vibration, the pile heads are crushed and separated by installing an expansion crushing agent that statically expands and crushes before concrete placing. Then, the whole pile head is lifted by a heavy machine or, if necessary, mechanically crushed and discarded.

This method, for example, as shown in FIGS. 19 and 20, sets a planned crushing level BL for crushing and removing the pile head slightly above the pile design level DL, and pouring fresh concrete. After pre-attaching the static expansion crushing agent 2 to the pile rebar 1 along substantially this level, ready-mixed concrete is poured and the concrete mass 3 at the pile head is removed as shown in FIG. Even in this case, the concrete block 3
As is clear from the figure, since it has a considerable weight and size including the whole core, it is necessary to use heavy equipment, and it is insufficient for low pollution requirements in terms of noise, especially in small sites. , It is difficult to secure a site for running heavy equipment and discarding waste concrete blocks. Although it is not mainly aimed at solving the above problems, it can be adopted for small-scale sites as a result by dividing the pile head into small pieces.
A method according to Japanese Patent Application Publication No. 63-27488 is disclosed.

[0004]

In the case of this method, since a cylinder or a long bag containing an expansive crushing agent is previously arranged in the pile reinforcing bar, the construction error of the height of the pile reinforcing bar affects the crushing level. There is a risk that the reliability of construction will be compromised,
In addition, when the pile rebar is installed during lifting or when placing concrete, the rebar lifting wire and the tremie pipe for placing come into contact with the placed cylinder and become misaligned, causing problems such as misdirection. , I can't get the expected result. Furthermore,
Since it is necessary to leave a predetermined space around the vertical axis in order to insert the tremie tube, it is not possible to place an expansive crushing agent in that space, so the core cannot be subdivided and the center There was a problem such as a fairly large and heavy lump remaining in the part, so a fundamental solution was impossible.

[0005]

According to the present invention, a waste jig having two types of expansive crushing agents having different expansion manifesting times is provided for pile excavation within a period of time after placing concrete into the pile and before hardening the concrete. The vertical shaft of the machine is used, or the force is pushed to the planned crushing level of the pile head overfilled concrete part by human power, and the problem is solved by using two kinds of crushing agents having different expansion onset times, and further the expansion crushing agent in the vertical position. The crushing was improved more effectively by using a push-down jig that can be collected without using a throwing jig.

That is, the first expansive crushing agent is arranged at a planned crushing level or slightly above it by being attached horizontally to an annular or polygonal frame-shaped horizontal frame body, and is arranged more than the first expansive crushing agent. The second expansive crushing agent having a slow expansion onset time is arranged so as to stand up from the center of the horizontal frame and several points around it to the top of the pile head, and the pile head is horizontally sliced at the bottom, Further, it is radially divided into a plurality of segments.

[0007]

[Function] The first expansive crushing agent horizontally arranged at the lower end of the discarding jig is arranged at the planned crushing level, or before the concrete is laid, it is horizontally leveled at the planned crushing level of the pile reinforcement. By mounting, when the concrete hardens, the pile head part is horizontally separated from the pile main body at a little upper part of the pile design level, and the separated pile head part is then separated from the pile main part including the central part of the waste jig. The second delayed expansion crushing agent attached to each vertical rod crushes in the longitudinal direction and the radial direction and radially divides into a plurality of segment-shaped agglomerates, so that it is easy to use without using heavy machinery. Can be removed. Furthermore, the second
In the improved method, the expansion jig is not restrained unless the disposal jig is used for the overdue expansion crushing agent, so that the subdivision is performed more effectively.

[0008]

EXAMPLE 1 FIG. 1 shows a first example of the present invention in which a pile head, a reinforcing bar cage, and a cast concrete, in a pile head treating method for treating a relatively large pile head, FIG. 2 is a side sectional view showing the relative positions of the installation jig and the pressing jig to which the expansive crushing agent is attached. FIG. 2 shows the AA line by removing the concrete and the pressing jig in FIG. It is the plane sectional view shown along. In FIG. 1, reference numeral C is a concrete cast, H is a pile hole, 7 and 7'reinforcing bars, and 8 is a main bar edge cutting such as urethane foam for preventing contact between the reinforcing bar 7 and the concrete C. The agent sheath, 10 is the arranging jig of the present invention, and 20 is a push-down jig for pushing down the arranging jig 10 by a mechanical force such as a hydraulic ram of a heavy machine or a human force. , 14 and 14 'are a part of members constituting the arrangement jig 10 which will be described later with reference to FIG. Sign
15 is an expansive crushing agent with an expansive onset time, 15 ', 1
Nos. 6,16 'are delayed-type expansion crushing agents whose swelling expression time is slower than usual.

Referring to FIG. 3 (A), the arranging jig 10 is a bottom frame body composed of a double circular frame 12 of a steel round bar and two horizontal bars 13 passing through the center and orthogonal to the diametrical direction. 11; a head frame body 11 'consisting of a circular ring 12' having an outer diameter substantially the same as that of the bottom frame body 11 and two horizontal rods 13 'passing through the center and orthogonal to the diametrical direction; The vertical bar 14 connecting the center parts of the lower pair of frames, and the middle of the radial part connecting the center and the circumference of the two horizontal bars 13 'orthogonal to the diametrical direction of each frame At the position, it is constituted by four vertical bars 14 'vertically connecting the two of the above-mentioned bottom frame and head frame to extend further upward.

In this embodiment, a double circular frame 12 is used for the bottom frame 11, but a single ring or FIG. 3 (B) is used.
It may be a single polygonal frame such as the triangle shown in FIG. In the first arranging jig 10 having such a structure, as shown in FIG. 5 (A), the static expansion crushing is performed along the lower surface of the double ring 12 of the bottom frame 11 by the normal static expansion crushing. An agent (hereinafter referred to as a first inflating agent) 15 is attached, and on the other hand, an expansion onset time is obtained at a position along a vertical rod 14 connecting the axes of both frames and a position along four vertical rods 14 '. A delayed expansion crushing agent (hereinafter referred to as a second expanding agent) 16 longer than usual is attached. Also, the four vertical rods 1 are provided on the upper surface of the ring 12 'of the head frame body 11'.
Horizontally surrounding 4 ', the same second expansion crushing agent 1 as above
Attach 5 '.

In this way, in order to press the first and second two kinds of expansion crushing agents into the concrete which is still in a soft state after the casting, the pressing jig as shown in FIG. 4 is used. 20 is prepared, but its structure is such that a frame 21 which is slightly smaller than the frame 12 'of the head frame of the arrangement jig 10 and a ring 23 constituting this frame 21 are divided into four equal parts. The hooks 24 hanging from the position are attached by welding, and the free ends of these hooks 24 are all oriented in the same direction in the circumferential direction of the ring 21. Also, a horizontal bar 22 that crosses a cross
A square tube 25 that rises vertically upward is fixed by welding or the like at the intersection position of the frame body 21, that is, at the center of the vertical axis of the frame body 21. The square tube 25 and the horizontal rod 22 are connected to each other and the reinforcing rod 26 is connected. Is provided.

When pouring fresh concrete, as shown in the cross-sectional view for explaining the arrangement of pile heads in FIG. 1, from the upper end of the pile reinforcing bar 7 to the planned crushing level in advance, a plastic such as urethane foam which is a main reinforcing bar edging agent. It is covered with a sheath pipe 8 to prevent the adhesion of green concrete.

Next, a ready-mixed concrete is poured through a tremie pipe or the like, and before it is hardened, as shown in FIG. 5 (A), an arrangement jig in which the first and second expansion crushing agents are arranged. 10
On the horizontal bar 12 '(see Figs. 1, 3 and 4)
0 of the hook 24 (see FIG. 4) is engaged to connect the square tube 25 to the hydraulic ram (shaft) of the pile excavator, and the ring 23 of the push-down jig 20 is connected with the mechanical force or manually. With the horizontal bar 22, the horizontal bar 12 of the placement jig 10 is pushed downward, and when the bottom frame body 11 located below reaches the planned crushing level, the square tube 25 of the pushing down jig 20 is In the example, the hook 24 of the pressing jig 20 is disengaged from the ring 11 of the first arranging jig 10 by rotating clockwise as viewed from above, and the pressing jig is pulled up.

FIG. 6 shows that when the ready-mixed concrete is hardened, the method according to the present invention allows the pile head to have a plurality of segment blocks 60.
FIG. 6 is a schematic perspective view showing a state in which a and 60b are vertically divided into small pieces 62 in the longitudinal direction, the radial direction, and horizontally by the crack 3 ′, and the portion outside the reinforcing bar is a peeled small piece 62.

In this embodiment, the bottom frame body and the head frame body are illustrated as annular rings, but instead of annular rings, triangles, squares, pentagons and hexagons are used depending on the diameter of the pile. Or make it a polygon such as an octagon and set the number of vertical bars to
It is obvious that the same crushing action can be achieved even if one is provided on the central axis and the number of angles is the same on the outer circumference. In this case, the polygonal frame forming the frame does not necessarily have to be a regular polygon. If it is not necessary to further slice the pile head horizontally in the middle, circular ring 1 of the head frame
2'or circular ring 12 'and head frame vertical rod 1
4'and the second expansion crushing agent are not used. When the diameter of the pile is about 800 mm, as shown in Fig. 3 (B),
The frame members 41 and 41 'are triangular, and one vertical rod 44 is provided along the central axis, and three are provided on the outer periphery.
It may be set to 0, and although not shown, the pile diameter is 900 to 1
In case of about 400 mm, one on the center axis and 4 on the outer circumference
When the pile has a square shape with a diameter of about 1500 to 2000 mm, it is obvious that the shape can be changed within the scope of the basic idea of the present invention, such as eight octagons on the outer circumference along the central axis. Incidentally, the frame shape of the push-down jig 20 may be set to a polygonal shape, and the number of hooks can of course be selected within the range of about 2 to 8.

Instead of the embodiment of the arrangement jig shown in FIG. 5 (A), an arrangement jig 10a having a slightly different structure can be used as shown in FIG. 5 (B). The function is almost the same as that of the placement jig of FIG. 5A except that the structure is composed of three layers of frame bodies 12a, 12b and 12c of the bottom portion, the middle portion and the head portion.

Embodiment 2 In Embodiment 2, the arrangement jig 30 shown in FIG. 9 is used in place of the arrangement jig 10 of Embodiment 1. This placement jig 30 is shown in FIG.
As shown in FIG. 9, one head frame body 11 ′ is used in place of the upper and lower pair of frame bodies composed of the bottom frame body 11 and the head frame body 11 ′ shown in (A). It has a structure in which six vertical rods 31 are hung parallel to each other and welded to each of the six equidistant points of the ring 12 ′. Install 16 (see Figure 10).
In this case, as shown in FIG. 7 and FIG. 8, after the first expansive agent 15 is horizontally arranged in the annular shape (polygonal shape) in advance to the planned crushing level of the pile reinforcing bars 7 before placing the concrete,
Placing ready-mixed concrete. 7 and 8, reference numeral 8 is a sheath of an edging agent such as urethane foam that prevents fresh concrete from adhering to the reinforcing bar 7 as in the case of the first embodiment. Subsequent steps are the same as in the case of the first embodiment shown in FIG. 1. Although the split state is not shown, only horizontal crack 3 ′ at the intermediate position shown in FIG. Fully subdivided into multiple segments.

Example 3 In Example 3, the pressing jig 2 used in Examples 1 and 2 was used.
The pressing jig 50 shown in FIGS. 11 and 13 is used in place of 0, and the placement jig is the placement jig 10 shown in FIGS. 1 and 3 (A).
Only the portion of the double circular frame 12 of FIG.

Referring to FIG. 13, the push-down jig 50 is attached to the second connecting block 51 with the vertical shaft of the pile excavator.
The central pipe 52 for accommodating the expansion crushing agent 16 is droop welded, and a hole 54a is formed in the center at the lower end portion where the window 52a is provided,
Disk 54 having hooks 24 (four in this example) on the lower surface
Is welded horizontally and is reinforced by a plurality of vertical ribs 55a on the upper portion near the connecting block 51 (the outer pipe 5
6 is pushed down horizontally). Between the two discs 54 and 55, the window 52a is formed at the lower end.
The outer pipe 56 having a window 56a corresponding to the central pipe 52 and having a length shorter than the space between the disks 54 and 55 is shorter than the central pipe 52.
A plurality (4 in this example) vertically supported and supported by a plurality of arms 57a (in this example, addressed to the upper and lower four) that are provided on the same axis line and are welded radially at equal angles. The small pipe 57 of FIG.
In the double circular frame 12 of the arranging jig 10 ′ including the double circular frame 12 and the horizontal bar 13 of (A), a plurality (four in this example) are provided at positions facing the lower end of the small pipe 57. Iron plate piece 12
a is welded and the horizontal bar 13 engages with the hook 24. The lower ends of the second expansion crushing agents 16 housed in the small pipe 57 and the central pipe 52 are connected to the horizontal bar 13 and the circular frame 12 by the string-like material 16a, and the second expansion crushing agent 16 floats. It is supposed not to.

Further, in the third embodiment, as shown in FIGS.
As shown in 5 and 16, pile rebar 7 and small pipe 5
A long portion 58b, 58'b of the string tied to the float 58 is attached to the float mounting metal fitting 58a made of wire or the like attached to the upper end of the ring 7 (Figs. 1 and 1).
5 and 16) respectively, the float 58 floats up near the surface of the concrete C to be placed, and the pile rebar 7
The position where the small pipe 57 is arranged is clearly indicated.

Furthermore, in this third embodiment, FIGS.
As shown in FIG. 4, before the concrete C is poured, the outer peripheral portion of the main reinforcement edging agent sheath tube 8 fitted to the upper part of the reinforcing bar 7 is wrapped in advance with a sheet-like material 59 in an envelope manner, and the sheet-like material is used at the time of placing the concrete. The object 59 is tightly bound to the rebar so that there is no displacement or bulge. This sheet-like material 59 is used in the first or second embodiment.
Can also be used for.

Next, the installation method and operation of the third embodiment will be described. First, referring to FIG. 13, the second expansion crushing agent 16 is inserted into the central pipe 52 and the small pipe 57 of the pressing jig 50,
Arrangement jig 10 'with the first expansion crushing agent 15 attached to the lower surface
Horizontal bar 13 and hook 2 fixed to the lower surface of the disk 54
Engage 4 Next, the string-like material 16a connected to the lower end portion of the second expansion crushing agent 16 in the central pipe 52 has windows 52a, 5
6a are used to tie the horizontal bar 13 to the horizontal bar 13 and the other string-like objects 16a to the circular frame 12 so that they are slightly slackened. On the other hand, as shown in FIG. 14, the longer side 58b of the string tied to the float 58 is preliminarily piled. As shown in FIG. 15, a long string 58 is passed through the float attachment fitting 58a at the upper end of the reinforcing bar 7.
The end of b, the float 58, and the short string 58c are positioned on the ground surface around the pile hole H. Next, when the ready-mixed concrete C is placed in the pile hole, the long string 58b is immediately pulled, and as shown in FIG. 16, about half of the float 58 is pulled to the stabilizing solution S, and the end of the short string 58c is pulled. Is placed on the ground surface. On the other hand, a long string 58'b is attached to the float fitting (not shown) at the upper end of the small pipe 57.
(Refer to FIG. 11) and if the pressing jig 50 is pushed down by mechanical force or human power such as hydraulic ram of heavy equipment before the ready-mixed concrete C is hardened, the above-mentioned float for pile reinforcement is shown in FIG. As in the case shown, the long string 58'b is pulled so that about half of the float 58 is covered with the stabilizing solution S, and the longer string 5 is pulled as the pressing jig 50 increases the pressing amount.
8'b is stretched in a stretched state, and the pushing jig 50 is pushed down while observing the relational position between the float for the outside pile reinforcing bars 7 and the float for the inside small pipes 57. 1
When the circular ring 12 of 0'has reached the planned crushing level BL, when the push-down jig 50 is rotated counterclockwise, the central pipe 52, the disk 54 and the hook 24 are integrated, so the hook 24 The engagement of the mounting jig 10 'with the horizontal bar 13 (see FIG. 13) is released. Therefore, pull the short strings 58C and 58'C located on the ground surface to float the float 58.
Is collected and the pressing jig 50 is raised, the placement jig 1
0'remains in that position, and the string-like object 16a is placed on the arrangement jig 10 '.
The second expansion crushing agent 16 connected by is left behind from the ascending central pipe 52 and the small pipe 56, and is vertically held at the respective positions.

In this way, in the third embodiment, the second crushing agent is separated from the placement jig and left, so that
The crushing effect is more remarkable because it is not constrained by a jig for slicing such as No. 2, and the sheet-shaped material 59 allows the concrete on the outer peripheral portion of the pile head to be smoothly peeled off. Even if the position of the pile rebar cannot be visually confirmed by the stabilizing liquid S, the depressing jig can be accurately pushed inside the pile rebar through the float to dispose the crushing agent at a predetermined position.

Example 4 It is considered that the continuous underground wall is formed by casting the cast-in-place pile into a rectangular shape and continuously arranging it at a predetermined interval for a long time. The head treatment method and the static expansion crushing agent disposition tool are applied to the above, and when the pressing jig 50 ′ is pressed down in FIG. 17 and when the pressing jig is raised, the first and second expansions are performed. FIG. 18 is a side sectional view showing a related position where the crushing agents 15 and 16 are arranged.
As shown in the cross-sectional view, the pile reinforcing bars 7 are arranged in a rectangular shape and the arrangement jig 1
0a is a rectangle, the small pipes 57 of the pressing jig 50 'are arranged in a rectangle, and the floats 58 are attached to the pile rebars at the four corners and the small pipes at the four corners. Detailed description is omitted.

[0025]

As described above, according to the present invention, the center of the pile head surplus concrete and a plurality of concentric circles inside the pile reinforcing bars are vertically arranged horizontally on the bottom frame. In addition to the root cutting by horizontal cutting, by arranging the second expanding crushing agent that expands later than the expanding crushing agent of 1,
Since the radial and vertical subdivision is effectively performed and crushed into multiple segments, it is not necessary to use heavy machinery, and it is possible to embed abandoned concrete lumps inside the plant and to dispose of them outside the site. Because it is easy, construction is easy,
Moreover, since the expansive agent is disposed by the throwing jig after the pouring of the ready-mixed concrete, the working accuracy is maintained, the construction period is shortened, and it is particularly suitable for the pile head treatment at a small-scale site.

[Brief description of drawings]

FIG. 1 is a side cross-sectional view showing relative positions of arrangement when a first expanding agent arranging jig is pushed into pile-head ready-mixed concrete with a mounting jig of Example 1 according to the present invention.

FIG. 2 is a plan sectional view taken along the line AA of FIG.

3 (A) and 3 (B) are perspective views of an arrangement jig according to the present invention.

FIG. 4 is a perspective view of a pressing jig according to the present invention.

5 (A) is an elevational view showing a state in which an expansive crushing agent is mounted on the arrangement jig shown in FIG. 3 (A).

FIG. 5 (B) is an elevation view showing a state in which the expansive crushing agent is attached to another arrangement jig.

FIG. 6 is a schematic perspective view showing a crushed state of a pile head manufactured by the method shown in FIG.

FIG. 7 is an arrangement explanatory view showing the relative positions when the pile head concrete is pushed in by the expansion crushing agent arrangement jig of Example 2 of the present invention.

8 is a sectional view taken along line BB of FIG.

FIG. 9 is a perspective view of an arrangement jig of Example 2.

FIG. 10 is an elevation view in which an expansive crushing agent is disposed on the disposing jig of Example 2 in FIG.

FIG. 11 is a side cross-sectional view showing a relative position of arrangement when the pushing-down jig and the arrangement jig of Example 3 are pushed into the pile head concrete.

12 is a cross-sectional view taken along line CC of FIG.

FIG. 13 is a perspective view showing a state in which an arrangement jig is attached to the pressing jig according to the third embodiment.

FIG. 14 is an explanatory diagram showing a state in which a string is tied to the float of the third embodiment.

15 and 16 are explanatory views showing a state in which a float is attached to a pile reinforcing bar.

FIG. 17 is a side sectional view showing an arrangement-related jig when the pressing jig of Example 4 is pushed into a continuous underground wall groove and when the pressing jig is pulled up.

18 is a cross-sectional view taken along the line DD of FIG.

FIG. 19 is an explanatory diagram of the arrangement of a pile head portion showing a conventional example.

20 is a cross-sectional view taken along the line EE of FIG.

21 is a perspective view showing a crushed state of a pile head made by the method shown in FIG.

[Explanation of symbols]

7 Pile Reinforcing Bar 8 Main Bar Edge Cutting Agent Sheath Pipe 10 Arrangement Jig of First Example 11, 11 'Frame 12,12', 12a, 12b12c, 42, 42 '
Frame 13, 13 ', 43, 43' Horizontal bar 14, 14 ', 44' Vertical bar 15 First expansion crushing agent 15 ', 16 Second expansion crushing agent 20 Push-down jig 21 Frame 22 Horizontal bar 23 Frame Solid 24 Hook 25 Square tube 26 Reinforcing rod 30 Second placement jig 31 Vertical rod 58 Float 59 Sheet material 60 Crushed pieces 60a, 60b Horizontal half-cutted pieces 62 Peeling pieces

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masaaki Takeda Inventor Masaaki Takeda 3-chome 33-3, Sachimachi, Asaka, Saitama 205 (72) Inventor Tatsuro Hirayama 2-13-14-213 Minamikasai, Edogawa-ku, Tokyo (72) Inventor Kazutoshi Watanabe 6-705 Nishimabashi Kuramoto, Matsudo City, Chiba Prefecture

Claims (10)

[Claims] 1. A crushing plan line of the pile head or a position above the crushing plan line for crushing and removing a pile head surplus portion of a cast-in-place pile in which a fresh concrete is poured and placed in a pile hole of a building. In the pile head treatment method in which a static expansion crushing agent is placed in the pile and crushing the pile head surplus portion by its expansion action, after placing the fresh concrete in the pile hole and before hardening the raw concrete. Of the pile head crushing plan line or above the inside of the reinforcing bar frame in the pile hole while in the soft state of
The first static expansion crushing agent having a normal expansion onset time is horizontally press-fitted and arranged in an annular or polygonal frame shape, and the axis of the ring or polygonal frame of the first static expansion crushing agent is placed. And slightly above the inside of the ring or the frame, and from a plurality of positions scattered on the circumference forming a substantially concentric circle with respect to the ring or the frame to the top of the pile head. A second static expansion crushing agent, which extends vertically and has an expansion time lagging behind the first static expansion crushing agent, is press-fitted and arranged, and an expansion pressure expressing time of the first static expansion crushing agent Is set to substantially coincide with the strength development time of the cast-in-place concrete, and the second static expansion crushing agent is set so that the expansion pressure expression time is further delayed with respect to the first static expansion crushing agent. , Cracking the head of the cast concrete pile in the horizontal direction by the first static expansion crushing agent. And root cutting is performed, and the second static expansion crushing agent causes a plurality of cracks that pass through the axial center portion and extend in the radial direction and the vertical direction to form a plurality of segment-shaped blocks. A method for treating a pile head of a cast-in-place pile, characterized in that the outer periphery of the rebar frame is separated and crushed for treatment. 2. The method for treating pile heads according to claim 1, wherein the first static expansion crushing agent is horizontally arranged in an annular shape or a polygonal frame shape, and the plurality of vertically expanding first crushing agents are arranged. A second static expansion crush agent horizontally disposed along the outer periphery of the second static expansion crush agent approximately midway between the top of the second static expansion crush agent and the first static expansion crush agent; The pile head, which is rooted substantially horizontally by the expansion crushing agent and is crushed in a segment by the second static expansion crushing agent arranged vertically, is further horizontally moved at a position in the middle of its height. A method for treating a pile head of a cast-in-place pile, characterized by dividing the pile. 3. The method for treating a pile head of a cast-in-place pile according to claim 1, wherein the crushing plan line of the pile head or a position above the line is a horizontal annular shape or a polymorphic frame shape inside the pile hole. The method for treating pile heads of cast-in-place piles, characterized in that the first static expansion crushing agent arranged in (1) is arranged in advance in the pile hole before placing the concrete. 4. The method of claim 1, wherein the first static expansion crushing agent is arranged horizontally and the plurality of second static expansions are arranged vertically. It is a placement jig that is fitted with a crushing agent and pressed into the concrete pile after it is placed and before it is hardened, and is placed at a planned crushing level or slightly higher. An annular or polygonal frame-shaped bottom frame which is press-fitted to the top and horizontally arranged to mount the first static expansion and crushing agent, and two distant parts provided on the bottom frame and on the outer periphery of the frame. A bottom frame body having a plurality of horizontal bars connecting the centers, and arranged horizontally above the bottom frame body by a predetermined height, and formed into an annular or polygonal shape having substantially the same size as the bottom frame. A head frame on which the second static expansion crushing agent is mounted horizontally and a space on the outer circumference of the head frame A head frame body and a plurality of horizontal bars connecting the two parts and the center, a plurality of horizontal bars of the bottom frame and the head frame,
A plurality of vertical bars vertically connected at an intermediate portion connecting the peripheral portion and the center of the frame and extending further upward; and a vertical bar hanging from the center of the head frame body to the center of the bottom frame body. ,
And a vertical connecting member on which the second static expansion and crushing agent is mounted. 5. The concrete pile used in the method for treating pile head according to claim 4, wherein after the concrete pile is cast with the first and second static expansion crushing agents and before the concrete pile is hardened. An arrangement jig for press-fitting and arranging in a space, wherein the bottom frame body and the head frame body are connected to each other by a plurality of vertical connection members extending only between the both frame bodies. Arrangement jig. 6. The method for treating a pile head according to claim 3, wherein the concrete pile is placed on the first static expansion crushing agent which is horizontally arranged in advance before the concrete pile is driven. A mounting jig for vertically mounting the plurality of second static expansion crushing agents and press-fitting the concrete piles into the concrete piles after the piles have been cast and before hardening. An annular or polygonal frame-shaped head frame to which a second static expansion crushing agent is horizontally arranged above the crushing level by a required height, a center of the head frame, and the frame body A head frame body having a plurality of horizontal connecting rods connecting at least three vertices of a circle or a polygonal frame, an axis of the head frame, and the ring. For mounting the second static expansion crushing agent, depending on the circumference or at least 3 vertices of the polygonal frame, hanging slightly above the planned crushing level Distribution 設治 tool, characterized in that it comprises a vertical rod number. 7. The pile head processing method according to claim 1,
In place of the disposing jig which is a disposal jig for disposing the second static expansion and crushing agent, the second static expansion and crushing agent left behind at the position arranged in the second expansion and crushing agent after the arrangement is left. A method for treating a pile head of a cast-in-place pile, characterized in that the position of the expansive crushing agent of No. 2 is held in the fresh concrete by a string-like material. 8. The pile head of a cast-in-place pile according to any one of claims 1 to 7, wherein a float indicating the mutual position of the pile rebar and the placement jig or the pushing jig is used. Processing method. 9. The pile head treatment method according to claim 1, wherein the sheet-shaped material enveloping the outer peripheral portion of the pile reinforcing bar to easily remove the concrete in the outer peripheral portion by the pile reinforcing bar in a peeling manner. A characteristic method for treating pile heads of cast-in-place piles. 10. The method for treating pile heads according to any one of claims 1 to 9, wherein a plurality of square-shaped piles are applied to crush the overfilled concrete of a continuous underground wall arranged at a predetermined interval. Pile head treatment method for cast-in-place piles.