JPH04140313A - Interlocking pipe structure in underground continuous wall construction method - Google Patents

Abstract

PURPOSE:To prevent concrete from flowing into an interlocking pipe when concrete is cast into an excavated ditch by providing a pressurizing means to impart pressure to a space in the interlocking pipe. CONSTITUTION:An excavated ditch 1 having desired depth is formed by excavation in such a manner that said ditch is filled with stabilizing liquid 3 to insert two pieces of interlocking pipes 14 along opposite inner walls of said ditch, with opposite ends 14a, 14b of the pipes 14 being opened. A closing lid 14c is placed on the opening at the upper end 14a of one of the pipes 14, so that a space S is provided between the lid 14c and the surface of a liquid 3 which flows into the pipe 14 through the lower end 14b thereof. A vent hole 14d is formed in the lid 14c to connect said hole to a compressor 14f. Next, when concrete 6 is cast into the ditch 1, compressed air is fed into the space S from the compressor 14f to pressurize the space S, preventing thereby the concrete 6 from flowing into the pipe through the opening at the lower end 14b. Consequently, concrete is prevented from flowing into and solidifying in the space in the interlocking pipe 14.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an interlocking pipe structure used in an underground continuous wall construction method.

(Conventional technology) The underground wall construction method has traditionally been used for retaining underground construction work, and is suitable for constructing new structures in close proximity to existing structures, especially in urban areas. It is widely adopted as a construction method.

Hereinafter, a method of constructing a continuous underground wall using conventional interlocking pipes will be described with reference to FIGS. 5(A) to 5(D).

In Fig. 5 (A) to (D), 1.1' is an excavated groove;
2 is a packet such as a Talamusiel packet for excavating the excavated trenches 1 and 1'; 3 is a packet for preventing ground collapse, which is circulated and injected into the excavated trench 1.1' excavated by the packet 2; Stable liquid such as bentonite solution.

4 is the excavated groove 1 after the completion of excavation. 1 along the side wall. A hollow interlocking vibrator is opened at both ends 4a and 4b, and 5 is a reinforcing bar inserted into the excavated grooves 1 and 1' after the interlocking vibrator 4 is inserted.

Furthermore, 6 is concrete to be placed in the excavated groove 1.1 after inserting the reinforcing bars 5, 7 is a tremie pipe for injecting and filling this concrete 6 into the excavated grooves 1 and 1', and 8 is the above-mentioned tremie pipe. Drilling r! This is a continuous underground wall formed by concrete 6 that has been cast and hardened within I41°1'.

Normally, in the above-mentioned underground continuous wall construction method, before starting the foundation work of a newly constructed structure, an excavation trench 1.1 is excavated so as to roughly surround the foundation work surface, as shown in Figure 5 (A). ) As shown in FIG.
l is excavated to the desired depth.

At this time, simultaneously with the excavation by the packet 2, a stabilizing liquid 3 such as a bentonite solution for preventing ground collapse is injected into the excavated groove 1, as shown in FIG. 5(A). This stabilizing liquid 3 is circulated by a circulation pump, etc. (not shown), and the stabilizing liquid 3 sucked from the excavated groove 1 is adjusted to a constant concentration so that its specific gravity does not decrease due to mixing of groundwater gushing into the excavated groove 1. It is then supplied into the excavated groove 1 again.

Once the excavation has been completed to a desired depth, the inter-opening pipe 4 is inserted into the excavation groove 1 along both side walls of the excavation 111, as shown in FIG. 5(B).
Furthermore, reinforcing bars 5 are inserted.

This interlocking vibe 4 is constructed by pouring concrete 6, which will be described later, into the excavated groove 1 and solidifying it.
This is to facilitate the excavation work of the bucket 2 when excavating the next excavation groove 1' in a position adjacent to this excavation groove 1, and to connect this excavation groove 1 and the next excavation groove. It is also used to form an interlocking part for the concrete 6 to be placed respectively.

Incidentally, since both ends of the interlocking vibrator 4 are open, when the interlocking vibrator 4 is inserted into the excavation groove 1, the stabilizing liquid 3 filled in the excavation rsl is as shown in FIG. 5(B).
It flows into the internal hollow part from the opening on the lower end 4b side.

When the reinforcing bars 5 are inserted, a tremie pipe 7 is inserted into the excavated groove 1 as shown in FIG. 5(C), and concrete 6 is poured into the excavated groove 1 through this tremie pipe 7. Since the specific gravity of the stabilizer 3 is sufficiently lower than that of the concrete 6, this concrete 6 is
It will be filled from the bottom.

This filled concrete 6 usually hardens after several hours, and a continuous underground wall 8 is formed within the excavated trench 1, thus completing the first step. Then, of the two interlocking vibes 4, the interlocking vibe 4 on the side that excavates the next excavation groove 1' is extracted, and as shown in FIG. 1 is excavated, and the same operations as described above are performed thereafter.

(Problems to be Solved by the Invention) However, since both of the ink locking vibe 4 having the above-mentioned conventional structure are open, both i4a and 4b are open. As shown in FIG. 5(C), the concrete 6 with a high specific gravity flows into the hollow portion from the opening on the lower end 4b side of the inter-port/inking vibe 4, pushing up the stabilizing liquid 3 that has already flowed.

Therefore, when the interlocking vibrator 4 is removed after the completion of the l process, the concrete 6 that has flowed in from the opening on the lower end 4b side is solidified, and before being used in the next process, the concrete 6 is removed from the upper end 4b side. Concrete that has flowed into the hollow near the opening and solidified must be removed, which poses a problem of lowering work efficiency.

The present invention has been made to solve the above problems, and its first purpose is to pressurize the internal space to prevent concrete from entering the excavated trench. An object of the present invention is to provide an interlocking pipe structure that can prevent the inflow of.

A second object of the present invention is to provide an interlocking system that can adjust the amount of pressurization of the internal space in response to the inflow pressure of concrete that changes in response to the amount of concrete poured into the excavated trench. The purpose is to provide pipe structure.

(Means for Solving the Problems) In order to achieve the above first object, the present invention is used in the underground continuous wall construction method, and has open ends at both ends to be inserted vertically into an excavated trench filled with a stabilizing liquid. The hollow interlocking pipe structure includes a closing lid that closes an opening on the upper end side of the interlocking pipe, and a stabilizing liquid that flows into the hollow portion from the lower end side of the interlocking pipe and the closing lid. and a pressurizing means for pressurizing the space formed between the two.

Further, in order to achieve the second object, the present invention provides the pressurizing means based on the detection result of a liquid level sensor that detects the liquid level of the stable liquid flowing into the hollow part. The amount can be changed.

(Function) The first invention has the above configuration, and the pressurizing means pressurizes the space formed between the blocking lid in the interlocking pipe and the liquid level of the stabilizing liquid, and supplies the stabilizing liquid to the interlocking pipe. Therefore, it is possible to prevent concrete from flowing into the interlocking pipe from the opening side end.

Further, according to the second invention, with the above configuration, when the inflow pressure of the conch notebook that is about to flow into the hollow part of the interlocking pipe from the opening side end of the ink locking pipe changes, the pressure inside the hollow part changes in response. The liquid level of the stabilizing liquid is detected by the liquid level sensor, and based on this detection result, the pressurizing means applies pressure to the space formed between the closing lid in the hollow part of the interlocking pipe and the liquid level of the stabilizing liquid. The amount of pressure will be changed.

Therefore, even if the inflow pressure of concrete flowing into the hollow part of the interlocking pipe fluctuates, by adjusting the amount of pressurization of the space by the pressurizing means,
It is possible to prevent concrete from flowing into the hollow portion of the interlocking pipe.

(Example) Embodiments of the present invention will be described below based on the drawings.

In addition, in the drawings in this example, the same elements as those in FIGS. 5(A) to (D) referred to in the description of the above-mentioned prior art are given the same reference numerals, and the description thereof will be omitted. .

First, a first embodiment of the present invention will be described with reference to FIG. 1 and FIGS. 2(A) to 2(C).

FIG. 1 is a partially cutaway side view showing an ink locking pipe structure according to a first embodiment of the present invention, and FIGS. 2(A) to (C)
) is an explanatory diagram illustrating the method of constructing an underground continuous wall using the same interlocking pipe.

In FIG. 1, 14 is a hollow interlocking pipe with openings at both ends 14a and 14b, which is inserted along the side wall of the excavation groove 1.1' after the completion of excavation. Occlusion iii that blocks this opening
I 4 c is removably provided.

This close 1! M14c is provided with a through hole 14d, and an air compressor 14f as a pressurizing means is connected to this through hole 14d via a pneumatic pipe 14e. The hollow space inside 14 can be pressurized.

Next, we will discuss the construction of a continuous underground wall 8 using the interlocking pipe 14 with the above configuration in Figures 2 (A) to (
This will be explained with reference to C).

First, in the same manner as shown in FIG. 5(A) referred to in the above-mentioned conventional technique, an excavated groove 1 of a desired depth is excavated with the packet 2 while the stabilizing liquid 3 is injected, and then the excavated groove is Two interlocking vibes 1 along both inner walls of l
4 and 14 with both ends 14a and +4b opened, and then as shown in FIG. 2(A), insert the upper end 14a of one of the two interlocking vibes 14.
A closing lid 14c is placed over the side opening to close it.

Here, the stabilizing liquid 3 is flowing into the hollow part inside the ink locking vibe 14 from the Tea 14b side when it is inserted into the excavation groove 1, similar to the conventional interlocking vibe. A space S is formed between the liquid level of the stabilizing liquid 3 and the closing lid 14c.

Next, the reinforcing bars 5 are inserted into the excavated groove 1, the tremie pipe 7 is further inserted, and concrete 6 is poured and placed, and the concrete 6 is filled from the bottom of the excavated groove 1 as in the conventional case.

By the way, if this state remains, the poured concrete 6 will flow into the hollow part inside the interlocking vibe 14 from the opening on the lower end 14b side, as shown in FIG. 2(B).

Therefore, the pneumatic vibrator 1 is inserted into the through hole 14d of the blockage 514c.
Compressed air is supplied to the space S inside the above-mentioned interface/linking vibe 4 by the compressor 14f connected through 4e, and the inside of this space S is pressurized.

As a result, the stabilizing liquid 3 that has flowed into the interlocking vibrator 14 is pushed down toward the lower end 14b of the interlocking vibrator 14, as shown in FIG. 2(C).
Concrete 6 is prevented from flowing in through the opening on the lower end 14b side.

As described above, according to the interlocking vibe 14 of the first embodiment, it is possible to prevent the concrete 6 from flowing into the interlocking vibe 14 during pouring of the concrete 6. The work of removing the concrete 6 that has adhered and hardened inside the interlocking vibe 14 before starting the next process can be omitted.

Next, a second embodiment of the present invention will be described with reference to FIGS. 3 and 4 (A) and (B).

FIG. 3 is a partially cutaway side view showing the ink locking vibe structure according to the second embodiment of the present invention, and FIG.
) is an explanatory diagram illustrating the internal state of the interlocking vibe when the same interlocking vibe is used for construction of an underground continuous wall.

In Figure 3, 14g is interlocking vibe 1
A liquid level sensor 14h detects the liquid level position of the stabilizing liquid 3 flowing into the interlocking vibrator 14, and a liquid level sensor 14h detects the liquid level position of the stabilizing liquid 3 inside the interlocking vibe 14 detected by the liquid level sensor 14g. This is a control device that controls the amount of pressurization of the space S in the interlocking vibe 14 by the air compressor 14f.

Next, we will explain the construction of a continuous underground wall 8 using the interlocking vibe 14 with the above configuration as shown in FIGS. 4(A) and 4(B).
).

In the construction of the continuous underground wall 8 using the interlocking vibe 14 of the second embodiment, excavation of the excavation groove 1, insertion of the interlocking vibe I4, and closing cover to the upper end + 4a side space [] of the interlocking vibe 14 are performed. The work up to the installation of the reinforcing bar 14c and the insertion of the reinforcing bar 5 is performed in the same manner as in the first embodiment.

At this point, the interlocking vibe 1 of the stabilizing liquid 3 that has flowed into the ink locking vibe 14
The liquid level position in the interlocking vibrator 14 is detected by the liquid level sensor 14g and notified to the control device 14h, and on the other hand, the control device 14h that receives this notification detects the current stable liquid level in the interlocking vibrator 14. The liquid level position No. 3 is held as the reference position.

Here, when the concrete 6 is poured into the excavated trench 1 via the tremie pipe 7, as shown in FIG. 4(A),
Concrete 6 flows in from the opening on the lower end 14b side of interlocking vibe 14, and the liquid level position in interlocking vibe 14 of stabilizing liquid 3 that has flowed into interlocking vibe 14 rises, and that position is always higher than that of the liquid. It is detected by the surface sensor 14g and notified to the control device 14h.

Upon receiving this notification, the control device 14h determines that the liquid level position in the interlocking vibe 14 of the stabilizing liquid 3 that has flowed into the ink and king vibe 4 is at the initial state maintained by the control device 14h. The space S created by the air compressor 14f is
Increase the amount of pressurization.

As a result, the stabilizing liquid 3 that has flowed into the interlocking vibrator 14 is pushed down toward the lower end 14b of the interlocking vibrator 14 as shown in FIG. is prevented.

By the way, the pressure when the poured concrete 6 tries to flow in against the hydraulic pressure of the stabilizing liquid 3 inside the interlocking vibe 14 increases as the amount of the concrete 6 poured increases. Therefore, if the pressurization by the air compressor 14f is constant, the concrete 6 will resist the hydraulic pressure of the stabilizing liquid 3 inside the interlocking vibrator 14, and the concrete 6 will eventually fall under the interlocking vibrator 14. Flowing in from the side entrance, Figure 4 (
In this case, where the situation is similar to A), the liquid level of the stabilizing liquid 3 in the interlocking vibe 14 rises again due to the liquid level sensor 14.
g, and based on this detection result, the control device +4h controls the space S by the air compressor 14f.
By increasing the pressurization amount of to return to.

As described above, according to the interlocking vibe 14 of the second embodiment, the amount of pressurization of the air compressor 14f that pressurizes the space S in the interlocking vibe 14 can be adjusted in accordance with the amount of concrete 6 poured. I can do it.

(Effects of the Invention) As described above, according to the present invention, the pressurizing means pressurizes the space formed between the closing lid in the interlocking pipe and the liquid level of the stabilizing liquid, and the stabilizing liquid is heated to the interlocking pipe. Since it is pressed against the lower end of the vibrator, it is possible to prevent the conch notebook from flowing into the interlocking pipe.

Further, according to the present invention, when the inflow pressure of concrete that is about to flow in from the lower end of the interlocking vibe changes, the liquid level of the stabilizing liquid that changes in response to this is detected by the liquid level sensor, and this detection result is Based on this, the pressurizing means changes the amount of pressurization of the space inside the interlocking pipe, so even if the inflow pressure of concrete into the interlocking pipe fluctuates, the amount of pressurization of the space by the pressurizing means can be changed. By adjusting it, it is possible to prevent concrete from flowing into the interlocking pipe.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view showing an ink locking pipe structure according to a first embodiment of the present invention, and FIGS. 2(A) to (C)
) are explanatory drawings explaining the method of constructing an underground continuous wall using the same interlocking vibe, and Fig. 3 is a partially cutaway cross-sectional view showing the interlocking pipe structure according to the second embodiment of the present invention. Figures 4 (A) and (B) are explanatory diagrams of the same interlocking vibe when used in the construction of an underground continuous wall, and Figures 5 (A) to (D) are illustrations of the interlocking vibe with the conventional structure. It is an explanatory view explaining the construction method of the continuous underground wall used. In the figure, 1.1 is the excavation groove, 3 is the stabilizing liquid, 14 is the interlocking vibe, 14a is the upper end, 14b is the lower end, 1
4c is a closing lid, 14f is an air compressor (pressurizing means), 14g is a liquid level sensor, and S is a space. Patent Applicant Fujita Kogyo Co., Ltd. Agent Patent Attorney No 1) Shigeozu Figure (A) Figure 4b Figure (B) Figure (C) Figure 4b Figure (A) Figure (B) Figure (8) ) Figure (C) Aa Figure (B) Figure (D) Mouth

Claims (2)

[Claims] (1) A hollow interlocking pipe structure with both ends open, which is used in the underground continuous wall construction method and is inserted vertically into an excavation trench filled with stabilizing liquid, the upper end side of the interlocking pipe. and a pressurizing means for pressurizing a space formed between the closing lid and the stabilizing liquid flowing into the hollow portion from the lower end side of the interlocking pipe. Interlocking pipe structure in underground continuous wall construction method. (2) The pressurizing means is characterized in that the amount of pressurization thereof can be changed based on the detection result of a liquid level sensor that detects the liquid level of the stable liquid flowing into the hollow part. Interlocking pipe structure in the underground continuous wall construction method described in l.