JP3445979B2 - Ptolemy tube, its connecting structure, and its attaching and detaching method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tremie pipe used for the construction of cast-in-place piles, underground continuous walls, etc., and ground improvement work, and its connecting structure and its attaching / detaching method. The attaching / detaching work such as connecting and disconnecting is performed by inserting / removing the flexible long rod-shaped body into / from the groove portion formed in the fitting portion of the fitted tremie tube.

[0002]

2. Description of the Related Art Conventionally, when a cast-in-place pile, underground continuous wall or ground improvement work is used as the foundation work of various buildings, or when the reverse construction method is adopted as a construction method, the land of several tens to hundreds of tens meters is used. A method in which a tremy pipe is inserted into the underground hole, a fluidizing material such as ready-mixed concrete or mud mortar is sequentially placed after digging the intermediate hole, and then a core material such as a reinforcing bar or H-shaped steel is arranged. Alternatively, a construction method in which a core material such as a reinforcing bar or H-shaped steel is first placed in an excavated underground hole, and then a tremie pipe is inserted and a fluidizing material such as ready-mixed concrete or mud mortar is sequentially placed and constructed. Is generally adopted.
The excavation method of the underground hole is the Benoto method or the earth drill method,
Generally, a method of excavating with an excavator while using high-concentration mud water or a stable liquid by a reverse construction method and sucking the excavated earth and sand together with the mud and discharging it to the ground is generally used.

The tremie pipe refers to the cast-in-place pile or a connected pipe used when pouring a fluidizing material such as ready-mixed concrete or mud mortar into the underground hole excavated in the underground continuous wall construction. The depth of the underground hole is 130 underground.
In some cases, it can reach up to meters, but generally it is underground 7
0 meters is normal. Then, put mud water or bentonite liquid or other soil stabilization liquid of low specific gravity into the excavated underground hole, insert a tremie pipe, and pour high concrete gravity of raw concrete or soil cement from the tip of the tremie pipe. . At this time, in order to prevent mixing of the soil stabilization liquid with low specific gravity and the green concrete with high specific gravity, the tip of the tremie pipe is controlled so that it is lapped by 2 or 3 meters above the listed material to be cast and always at the bottom.

Various lengths of tremie pipes are prepared in advance. Depending on the depth of the underground hole, 6m pipes, 5m pipes, 4m pipes, 3m pipes, 2m pipes,
A tremie pipe selected from 1 meter pipes is connected in a vertical direction so as to have a predetermined length, and is extended to a length reaching the vicinity of the bottom of the excavated underground hole for use.

14 and 15 are perspective views of a main part for explaining a conventional method for attaching and detaching a tremie tube. In the example of FIG. 14, a reinforcing flange portion 13 provided at the lower end of one tremie tube 10a.
A plurality of screw holes 14a are opened in a, and the screw holes 14b are similarly opened in the reinforcing flange portion 13b provided at the upper end of the other tremie tube 10b.
The bolt 15 inserted in b is screwed into the nut 16 and tightened with a wrench 17.

In the example of FIG. 15, a screw hole 19 is opened in a small-diameter fitting portion 18 provided at the lower end of one tremie tube 10a, and a short projection 20 is formed on the outer wall surface of the fitting portion 18.
On the other hand, a long screw hole 22 is opened in a large-diameter fitting portion 21 provided on the upper end of the other tremie tube 10b, and short projections 23, 23 are formed on the inner wall surface of the fitting portion 21. Form. Then, the small-diameter fitting portion 18 is inserted into the large-diameter fitting portion 21, the bolts 15 are screwed into the screw holes 19 and 22, and the one tremie pipe 10 is tightened by using the tightening jig 24.
By rotating a together with the suspension ring (not shown) and assembling the protrusion 20 and the protrusion 23 with each other, both tremie tubes 10a and 10b are hermetically connected.

[0007]

However, none of the conventional methods for attaching and detaching a tremie tube described above have good operability and safety, and are highly efficient and highly safe when used at work sites. Under the present circumstances, it is desired to realize the attachment / detachment method. For example, in the example of FIG. 14, the bolt 15 must be inserted into each of the plurality of screw holes 14a and 14b opened in the reinforcing flange portion 13a of the tremie tube 10a and the reinforcing flange portion 13b of the tremie tube 10b and screwed into the nut 16. Since it has to be done, it takes extra time and the work itself is troublesome, and there is a problem that the work efficiency of screwing and fixing the bolts and nuts decreases, especially when the diameter of the tremie pipe is small or in the cold of winter. Bolt 15 while working outside
Accidents of dropping the slab into the underground hole are likely to occur frequently, which causes problems in economic terms.

In the example of FIG. 15, the small-diameter fitting portion 18 is inserted into the large-diameter fitting portion 21, the bolts 15 are screwed into the screw holes 19 and 22, and the tightening jig 24 is further attached. Since it is necessary to rotate the tremie tube 10a by using it to assemble the projection 20 and the projection 23 together, the operation is complicated, and moreover the tremie tube 10a together with the suspension ring can be accurately rotated in the screwing direction. If the tremie pipe 10a is required and the direction of rotation of the tremie pipe 10a deviates even a little, the connection may be broken and the other tremie pipe 10b may drop from the connecting portion into the underground hole, causing a problem in terms of safety. is there.

Therefore, the present invention solves the above problems,
A tremie pipe and its which can improve operability and safety in the construction method of pouring ready-mixed concrete or mud mortar etc. into the underground hole through the tremie pipe and improve the efficiency at the work site. An object of the present invention is to provide a connecting structure and a method for attaching and detaching the connecting structure.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention is designed so that a plurality of pipes are mutually connected to have a predetermined length in order to drive fresh concrete or mud mortar into an excavated underground hole. In a tremie pipe to be used in a connected manner, a flexible rod-like body is formed with a circumferential groove portion on the outer wall surface of a fitting portion having a small diameter provided at one end of the tremie pipe, while a tremie pipe is formed. A circumferential groove is formed on the inner wall surface of a large-diameter fitting portion provided at the other end of the pipe, in which the rod-shaped body can be freely inserted and removed,
Provided is a tremie tube in which an elongated hole into which the rod-shaped body is freely inserted and removed is provided on the wall surface of a fitting portion having a large diameter. In addition, the seal member is attached to the groove for the seal member formed on the outer wall surface of the small-diameter fitting portion provided at one end of the tremie pipe, and is attached to the outer wall surface of the small-diameter fitting portion provided at the one end of the tremie pipe. A plurality of formed groove portions and groove portions formed on the inner wall surface of the large-diameter fitting portion provided at the other end of the tremie tube are formed.

Further, as a connecting structure of the tremie tube, a circumferential groove portion into which a flexible rod-shaped body is insertable and detachable is formed on an outer wall surface of a small-diameter fitting portion provided at one end portion of the tremie tube. On the other hand, on the inner wall surface of the large-diameter fitting portion provided at the other end of the tremie tube, a circumferential groove is formed in which the rod-shaped body can be inserted and removed, and on the wall surface of the large-diameter fitting portion, When a rod-shaped body opens a slot into which it can be inserted and removed and one end of one tremie pipe and the other end of the other tremie pipe are fitted together, they are formed on the outer wall surface of the fitting part with a small diameter. The grooving part and the groove part formed on the inner wall surface of the large-diameter fitting part are aligned with each other, and the rod-shaped body is inserted into the aligned groove part to be housed, so that one tremie tube and the other And a connecting structure for mutually engaging the tremie tubes of the above. And, the flexible rod-shaped body is composed of a member in which a plurality of wires are twisted together to increase the strength, and the width of the elongated hole is set to a size in which the handle of the rod-shaped body can be stored. The outer wall surface of the tremie pipe after connection is held flat, and a cover member such as a rubber belt is covered at a position covering the upper surface of the elongated hole to hold it flat.

As a method for attaching and detaching the tremie tube, a small-diameter fitting portion provided on one tremie tube is inserted into a large-diameter fitting portion provided on the other tremie tube, and a wall surface of the large-diameter fitting portion is inserted. Insert a flexible rod into the long hole opened above,
By accommodating the rod-shaped body annularly in the groove formed in the fitting portion, a method of attaching and detaching the tremie tube that connects both tremie tubes in a hermetically sealed manner and a fitting portion of one tremie tube having a small diameter are provided. After fitting the seal member into the groove for the seal member, insert the fitting part into the large-diameter fitting part provided on the other tremie pipe, and insert it into the long hole opened on the wall surface of the large-diameter fitting part. A groove formed by inserting a flexible rod-shaped body into a circumferential groove portion formed on the outer wall surface of the fitting portion having a small diameter and a circumferential groove portion formed on the inner wall surface of the fitting portion having a large diameter. By accommodating the rod-shaped body in a ring shape, there is provided a method of attaching and detaching a tremie tube in which both tremie tubes are connected in an airtight manner.

According to the tremie pipe, the connecting structure thereof, and the attaching / detaching method thereof, when the tremie pipes are connected to each other, a fitting portion having a small diameter is attached to one end portion of the tremie pipe side.
It is inserted into a large-diameter fitting part provided at the other end of the other tremie tube, and when the grooves formed in both fitting parts are aligned, the worker inserts a flexible rod into the long hole. As a result, the rod-shaped body is annularly housed in the groove formed along the circumferential surface of the fitting portion, and both tremie tubes are hermetically connected. At this time, the airtightness at the fitting portion is enhanced by using the sealing member together. Further, even if a force is applied from the outside in a direction in which the tremie tubes are separated from each other, the rod-shaped body made of a strength member acts as a stopper, and the tremie tubes are prevented from coming off from the fitting portion. When pulling out both tremie pipes, the worker pulls out the rod from the long hole, and the small-diameter fitting part easily separates from the large-diameter fitting part. The tubes can be attached to and detached from each other.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Specific embodiments of a tremie tube, a connecting structure therefor, and a method for attaching and detaching the same according to the present invention will be described below with reference to the same components as those in the conventional example described above with the same reference numerals. To do. FIG. 1 is a perspective view of an essential part showing a detachable part of a tremie tube according to the present embodiment.
Reference numeral b is a tremie pipe interconnected with each other, and a flexible rod-shaped body is inserted into the outer wall surface of the fitting portion 18 having a small diameter provided at one end (lower end in the figure) of one tremie pipe 10a. A detachable circumferential groove portion 25 and seal member groove portions 26, 26 into which the seal member is insertable and detachable are formed. Although only one groove portion 25 is shown in the illustrated example, two or more groove portions 25 can be formed.

A large-diameter fitting portion 21 through which the small-diameter fitting portion 18 provided on the one tremie tube 10a can be inserted is provided at the other end portion (upper end portion in the figure) of the other tremie tube 10b. The inner wall surface of the large-diameter fitting portion 21 is provided with a circumferential groove portion 27 into which a flexible rod-shaped body can be inserted and removed. The groove portion 27 is set so as to be in a position corresponding to the circumferential groove portion 25 formed on the tremie tube 10a side when the fitting portion 18 is inserted into the fitting portion 21.
The number of the grooves 27 is not limited to one, and two or more grooves 27 may be formed.

On the wall surface of the fitting portion 21 having a larger diameter, a long hole 28 into which the rod-shaped body can be inserted and removed is formed at a portion corresponding to the groove portion 27. The number of the long holes 28 is not limited to one, and two or more may be formed. Reference numeral 29 is a flexible rod-shaped body, and this rod-shaped body is composed of a member whose strength is increased while keeping flexibility by twisting a plurality of wires. One end of the rod-shaped body 29 has a handle 29a. Is attached.

According to this structure, the tremie tube 10a,
When connecting 10b, as shown in FIG. 2, an O-ring 30 as a sealing member is provided in the sealing member groove portions 26, 26 provided in the small-diameter fitting portion 18 at one end portion on the side of one tremie tube 10a. After fitting, the fitting portion 18 is inserted into the large-diameter fitting portion 21 provided at the other end of the other tremie pipe 10b, and when the groove portion 25 and the groove portion 27 coincide with each other, the worker pushes the rod-shaped body 29. Using the handle 29a of the
Insert in 8. In the case where a plurality of groove portions 25 and a plurality of groove portions 27 are formed, individually prepared rod-shaped bodies 29 are inserted through the plurality of elongated holes 28.

Then, as shown in FIG. 3, the groove portion 25 and the groove portion 2 formed along the circumferential surfaces of the fitting portion 18 and the fitting portion 21.
A flexible rod-shaped body 29 is housed in the inside of 7 in an annular shape, and with the presence of an O-ring 30 as a seal member, both tremie tubes 10a and 10b are engaged with each other and connected under hermetic sealing. be able to. Further, by setting the width of the elongated hole 28 in advance to a size capable of accommodating the handle 29a of the rod-shaped body 29, the handle 29a does not project to the outside of the tremie tube 10b after the tremie tube is connected. The outer wall surface of the tremie tube 10b can be held flat.
It is also possible to cover the upper surface of the elongated hole 28 with a cover member such as a rubber belt, which is separately prepared, so as to be flat.

4 and 5 are enlarged views of the portion A of FIG. 3, showing a small-diameter fitting portion 18 and a large-diameter fitting portion 2.
The groove portion 25 and the groove portion 27 are set so as to coincide with each other when they are sufficiently inserted into the groove 1.
The rod-shaped body 29 is inserted and arranged in the annular hole portion constituted by. As shown by arrows C and D in FIG. 5, even if a force is applied from the outside in the direction in which the tremie tubes 10a and 10b are separated from each other, the rigidity held by the rod-shaped body 29 constituted by the strength member is maintained. Then, the fitting portion 21 and the fitting portion 18 are prevented from coming off, and the so-called rod-shaped body 29 is the so-called tremie tube 1.
It acts as a stopper to prevent the 0a and 10b from coming off.

When the tremie tubes 10a and 10b are separated from each other, an operator pulls out the rod-shaped body 29 from the elongated hole 28 by using the grip 29a, so that the small-diameter fitting portion 18 has a large-diameter fitting portion 21. Easily separate from. Therefore, according to the present invention, the tremie tube 10 is operated by simply inserting and removing the flexible long rod-shaped body 29 from the elongated hole 28.
The a and 10b can be attached to and detached from each other.

In the conventional method in which the fluidizing material such as mud mortar or the like is first placed in the underground hole and then the H-shaped steel or the like as the core material is built, the fluidizing material begins to solidify during the building. In addition, it was impossible to construct a hole with a depth of about 70 meters. Therefore, recently, a method of predominantly building a reinforcing bar or an H-shaped steel as a core material in the underground hole, and then assembling a tremie pipe and placing a fluidizing material has become mainstream. Since this method requires rapid insertion of a large number of tremie tubes, the present invention makes it possible for the first time to quickly assemble a large number of tremie tubes to a predetermined length and insert them into the underground hole. It is a thing. In order to show an example thereof, an example of core material installation and mud mortar placement in an underground hole in a cast-in-place pile construction using the tremie pipe according to the present embodiment will be described with reference to FIGS. 6 to 13. Figure 6
As shown in (B), after excavating the underground hole 1 using an unillustrated excavator, the core material guide base 3 is set on the upper surface of the underground hole 1 using the crane 2 of the auger machine. . As shown in the enlarged view of FIG.
A core material temporary receiving material 3a and a core material guide angle 3b are arranged vertically and horizontally on the top.

Next, as shown in FIGS. 7 (A) and 7 (B), the core members 4 and 4 made of H-shaped steel are provided in the space formed between each core member temporary receiving member 3a by using the hook 2a of the crane. The temporary construction of
At this time, the screw connut 4a is welded to the vicinity of the upper end of the side surface of each core material 4, 4. Next, as shown in FIGS. 8 (A) and 8 (B), the lower end portion of the main traverser 5 which is a core suspension set, and the suspending tools 6a of the plurality of screw controller traversers 6 and 6 suspended from the main traverser 5 are attached. 9A and 9B, the core members 4 and 4 are lifted to a certain height by using the hook 2a of the crane as shown in FIGS. Weld the width stop plate 7.

Next, as shown in FIGS. 10 (A) and 10 (B), the core materials 4 and 4 have been built in the underground hole 1, and the screw contact 8 is fixed to the core guide base 3. Next, as shown in FIG. 11 (C), a tremie pipe 10 of an arbitrary length is selected from the separately prepared tremie pipe rack 9 by using the hook 2a of the crane as shown in FIG. 11 (A) and (B). The tremie pipe 10 is hung between the core members 4 and 4 and is installed, as shown in FIG.
As shown in (B), the mud mortar distributor 11 is set close to each tremie pipe 10, and the mud mortar produced by the concrete mixer 12 is poured into each tremie pipe 10 using the chute 12a. Tremie tube 10
Laying 2m or 3m from the listed mud mortar where the tip of the slab is driven, and placing it while controlling it to be at the bottom. After the casting, the tremie pipe 10 is pulled out, and the core material fixing frame is removed after curing for a certain period of time.
The placement of the mud mortar 40 is completed as shown in FIG.

[0024]

As described above in detail, according to the present invention, the worker simply inserts or pulls out the flexible rod into the slot at the time when the grooves formed in the fitting portion coincide with each other. Since the tremie pipes can be attached to and detached from each other by performing the operation, operability and safety can be improved, and the work efficiency at the work site can be improved. In particular, the work of screwing and fixing the bolts and nuts that have been conventionally used is not necessary, and there is no fear that a bolt or the like will fall.

Further, after fitting both tremie pipes, the tremie pipes are rotated by using a tightening jig to assemble the protrusions with each other without the troublesome operation of the conventional method, and moreover, the hanging ring is used. At the same time, since the operation of accurately rotating the tremie pipe in the screwing direction is not required, it is possible to prevent a situation in which the tremie pipe falls into the underground hole from the connecting portion, and it is possible to further enhance safety.

Therefore, according to the present invention, the operability and safety in the construction method of pouring ready-mixed concrete, mud mortar, etc. into the underground hole through the tremie pipe to enhance the workability and the work efficiency are improved. It is possible to provide a tremie tube capable of performing the above, a connecting structure thereof, and a method for attaching and detaching the same.

[Brief description of drawings]

FIG. 1 is a perspective view of essential parts showing a detachable part of a tremie tube according to the present invention.

FIG. 2 is a cross-sectional view of a main part showing an operation mode of the present invention.

FIG. 3 is a sectional view of an essential part showing the operating mode of the present invention.

FIG. 4 is an operation mode diagram showing an enlarged part A of FIG. 3;

FIG. 5 is another operation mode diagram showing an enlarged part A of FIG. 3;

FIG. 6 is a schematic view showing an example of core material installation and mud mortar placement in an underground hole using the present invention.

FIG. 7 is a schematic diagram showing an example of placing mud mortar using the present invention.

FIG. 8 is a schematic view showing an example of placing mud mortar using the present invention.

FIG. 9 is a schematic diagram showing an example of placing mud mortar using the present invention.

FIG. 10 is a schematic diagram showing an example of placing mud mortar using the present invention.

FIG. 11 is a schematic view showing an example of placing mud mortar using the present invention.

FIG. 12 is a schematic diagram showing an example of placing mud mortar using the present invention.

FIG. 13 is a diagram showing completion of placing mud mortar.

FIG. 14 is a perspective view of essential parts for explaining a conventional method for attaching and detaching a tremie tube.

FIG. 15 is a perspective view of essential parts for explaining another conventional method for attaching and detaching a tremie tube.

[Explanation of symbols]

10a, 10b ... Tremy tube 18, 21 ... Fitting part 25, 27 ... Groove 26 ... Groove for seal member 28 ... slot 29 ... Rod-shaped body 30 ... O-ring Reference number P3301

Claims (9)

(57) [Claims] 1. A tremie pipe which is used by connecting a plurality of pieces to each other so as to have a predetermined length in order to drive ready-mixed concrete, mud mortar or the like into an excavated underground hole, at one end of the tremie pipe. On the outer wall surface of the small diameter fitting part provided,
While the flexible rod-shaped body forms a circumferential groove into which the rod-shaped body can be inserted and removed, the rod-shaped body can be inserted into and removed from the inner wall surface of the large-diameter fitting portion provided at the other end of the tremie tube. A tremie tube, characterized in that a circumferential groove is formed, and an elongated hole into which the rod-shaped body can be inserted and removed is opened on a wall surface of a large-diameter fitting portion. 2. The tremie tube according to claim 1, wherein a seal member is mounted in a groove for a seal member formed on an outer wall surface of a fitting portion having a small diameter provided at one end of the tremie tube. 3. A groove formed on the outer wall surface of a small-diameter fitting portion provided at one end of the tremie tube and a groove formed on the inner wall surface of a large-diameter fitting portion provided at the other end of the tremie tube. The tremie tube according to claim 1, wherein a plurality of tremie tubes are formed. 4. A tremie pipe connecting structure, which is used by connecting a plurality of tremie pipes to each other so as to have a predetermined length in order to drive ready-mixed concrete, mud mortar or the like into an excavated underground hole, On the outer wall surface of the small diameter fitting part provided at one end of the tremie pipe,
While the flexible rod-shaped body forms a circumferential groove into which the rod-shaped body can be inserted and removed, the rod-shaped body can be inserted into and removed from the inner wall surface of the large-diameter fitting portion provided at the other end of the tremie tube. Along with forming a circumferential groove, an elongated hole into which the rod-shaped body can be inserted / removed is opened on the wall surface of the large-diameter fitting portion, and one end of one tremie pipe and the other end of the other tremie pipe are formed. When the two are fitted to each other, the groove formed on the outer wall surface of the small-diameter fitting portion and the groove formed on the inner wall surface of the large-diameter fitting portion are made to coincide with each other, and A connecting structure for a tremie pipe, wherein one tremie pipe and the other tremie pipe are engaged with each other by inserting and accommodating a rod-shaped body through an elongated hole. 5. The connection structure for a tremie tube according to claim 4, wherein the flexible rod-shaped body is formed of a member in which a plurality of wires are twisted together to increase strength. 6. The tremie tube according to claim 4, wherein the width of the elongated hole is set to a size capable of accommodating a rod-shaped handle, and the outer wall surface of the tremie tube after connection is held flat. Connection structure. 7. The cover member, such as a rubber belt, is covered at a position covering the upper surface of the elongated hole and is held in a flat shape.
The connection structure of the tremie tube according to 5 or 6. 8. A method of attaching / detaching a tremie pipe, wherein a plurality of tremie pipes are connected to each other so as to have a predetermined length for placing fresh concrete, mud mortar or the like into an excavated underground hole. Insert the small-diameter fitting part provided on the pipe into the large-diameter fitting part provided on the other tremie pipe, and place the flexible rod-shaped body in the long hole opened on the wall surface of the large-diameter fitting part. A method of attaching / detaching a tremie tube, characterized in that the rod-shaped body is annularly housed in a groove formed in the fitting portion by inserting the tremie tube and the tremie tubes are hermetically sealed. 9. A method of attaching / detaching a tremie pipe, wherein a plurality of tremie pipes are connected to each other so as to have a predetermined length in order to drive ready-mixed concrete, mud mortar or the like into an excavated underground hole. After fitting the seal member into the groove for the seal member provided in the fitting portion of the small diameter of the pipe, the fitting portion is inserted into the fitting portion of the large diameter provided in the other tremie pipe, A flexible rod-shaped body is inserted into an elongated hole opened on the wall surface, and a circular groove formed on the outer wall surface of the small-diameter fitting portion and a circle formed on the inner wall surface of the large-diameter fitting portion. A method of attaching / detaching a tremie tube, characterized in that both tremie tubes are connected in a hermetically sealed manner by accommodating the rod-shaped body in a groove formed by a circumferential groove portion.