JPH07127051A - Structure of rebar cage for continuous underground wall construction and its construction method - Google Patents

Abstract

(57) [Abstract] [Objective] The present invention is capable of suppressing the leakage of groundwater and the deterioration of the reinforced concrete frame without providing a facility for drainage disposal in the wall, and a continuous underground wall construction. It is an object of the present invention to provide a structure of a reinforcing steel basket and a method of constructing it. According to the present invention, in a rebar basket built in an excavation groove when constructing a continuous underground wall, adjacent rebar baskets are provided on both end sides in the longitudinal direction of the continuous underground wall of the rebar basket. Connecting joints are provided, these joints project in the width direction to the vicinity of the outer surface of the continuous underground wall, and a waterproof sheet located along the outer surface of the continuous underground wall is installed between the joints on both ends. It is a structure of a reinforced basket for continuous underground wall construction, which is characterized by being installed. Further, in the method of constructing a reinforcing bar cage for continuous underground wall construction, the joint equipped to the reinforcing bar cage for the preceding element built in the excavation groove earlier, the joint equipped to the reinforcing bar cage for the trailing element A method for constructing a reinforcing bar cage for continuous underground wall construction, characterized in that the reinforcing bar cage for a succeeding element is connected by using a joint on the reinforcing bar cage side for a preceding element as a guide.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a reinforcing bar cage for constructing a continuous underground wall and a method of constructing the same.

[0002]

2. Description of the Related Art When a main body of a continuous underground wall is used, it is impossible to attach a waterproof sheet to the outer surface of the wall by a normal method. Therefore, waterproofing of the wall is neglected or neglected. This is the current situation.

[0003]

As described above, since the waterproofing of the continuous underground wall has been conventionally ignored or neglected, the following drawbacks occur.

<A> Groundwater leaks from the cracked portion of the wall concrete.

<B> It is necessary to provide a facility for draining the leaked water by pumping up the leaked water in the wall.

<C> Groundwater is always supplied to the cracks in the reinforcing bar concrete of the wall body, and deterioration of the reinforcing bar concrete body due to the progress of rust of the reinforcing bar becomes a problem.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to prevent ground water from leaking or to reinforce concrete without providing equipment for drainage disposal in the wall.
An object of the present invention is to provide a structure of a reinforcing bar cage for constructing a continuous underground wall and a method of constructing the same, which can suppress deterioration of the frame.

[0008]

[Means for Solving the Problems] That is, the present invention relates to a rebar cage that is built in an excavation trench when a continuous underground wall is constructed,
On both end sides in the longitudinal direction of the continuous underground wall of the reinforcing bar basket, joints for connecting adjacent reinforcing bar baskets are provided, and these joints are projected in the width direction to the vicinity of the outer surface of the continuous underground wall, and both ends The structure of the reinforcing bar cage for continuous underground wall construction is characterized in that a waterproof sheet located along the outer surface of the continuous underground wall is stretched between the joints on the side of the section. In addition, the joint, the tubular female joint having a slit opened in the depth direction of the continuous underground wall, and a male joint inserted into the female joint through the slit, both of these joints It is a structure of a reinforced basket for continuous underground wall construction, which is constructed so that it cannot be pulled out in the length direction of the continuous underground wall. Further, the female joint has a structure of a rebar basket for continuous underground wall construction in which a male joint is inserted and grout is filled. Next, in the method of constructing a reinforcing bar cage for continuous underground wall construction, after constructing a reinforcing bar cage for a preceding element equipped with one of a male joint or a female joint in the excavation groove, a male joint or a female joint When installing the rebar cage for the trailing element equipped with the other of the above, insert the male joint into the female joint through the slit, and build the rebar cage for the trailing element using the joint built in advance as the guide. It is a method of constructing a reinforced basket for continuous underground wall construction, which is characterized in that it is installed. Further, it is a method of constructing a reinforcing bar cage for continuous underground wall construction in which a joint that has been installed in advance is used as a guide to construct a reinforcing bar cage for a trailing element and then grout is filled in the female joint.

[0009]

EXAMPLES <B> Structure of Reinforcing Bar Basket One example of the structure of the reinforcing bar cage will be described below.

(1) Reinforcing bar cage main body The reinforcing bar cage main body is a publicly known one manufactured by joining vertical bars and horizontal bars and the like into a box shape, and as shown in FIG. Prepare the rebar cage 1b for the row element. A partition iron plate 11 is attached to the wife side of the reinforcing element basket 1a for the preceding element, and a width retaining bar 12 is attached to the wife side of the reinforcing element basket 1b for the following element to produce a frame for the reinforcing cage. Further, the partition iron plate 1 on the inner surface B side of the continuous underground wall
A known canvas sheet 13 is stretched between the two.

(2) Female joint The female joint 2 is provided at the end portion of the continuous underground wall on the outer surface A side of the frame portion such as the partition iron plate 11 of the reinforcing element basket 1a for the preceding element. For the female joint 2, a tubular body such as a square or circular shape is used, and it is formed integrally or separately in the depth direction of the continuous underground wall along the end of the partition iron plate 11 or the like. Join what you did. A part of the outer surface of the female joint 2 is projected in the width direction up to the vicinity of the outer surface A of the continuous underground wall. For example,
In the case of the prismatic tubular body as shown in FIG. 1, one side surface thereof is located along the outer surface A of the continuous underground wall.

Further, a slit 21 which is continuous from the upper end of the pipe body to the waterproof range is formed on the end side of the female joint 2. Further, valves 22 made of a hard rubber plate or the like are mounted on both sides of the outer surface of the slit 21 so that the concrete joint does not flow into the female joint 2. The female joint 2 is designed to move in the longitudinal direction of the continuous underground wall when the male joint is inserted in consideration of the installation accuracy of the reinforcing bar cage for the leading and trailing elements. It is advisable to secure a certain length in the length direction.

(3) Male joint The frame of the width retaining bar 12 of the rebar cage 1b for the trailing element, etc.
At the end of the continuous underground wall on the outer surface A side, the male joint 3 is provided so as to project to the preceding element side. The male joint 3 is integrally formed continuously along the end of the width-retaining bar 12 or the like from the upper end of the rebar cage to the waterproof range, or is joined separately. The shape of the male joint 3 is, for example, as shown in FIG.
As shown in FIG. 2, an insertion portion 31 such as a steel plate that can be inserted into the slit 21 of the female joint 2 and a locking portion 32 such as a steel plate that does not come out from the slit 21 formed at the tip of the insertion portion 31 form a substantially T It is conceivable that it is formed into a shape. It is also possible to equip the rebar cage for the preceding element with a male joint and equip the rebar cage for the following element with a female joint.

(4) Filling of grout The grout 4 is filled in the female joint 2 in a state in which both joints are fitted to each other so as to improve the waterproofness and the joint strength. It is preferable to use a non-contractile grout 4.

(5) Waterproof Sheet As shown in FIG. 1, between the female joints 2 and between the male joints 3, along the outer surface A of the continuous underground wall, the waterproof sheet 5 covers the entire waterproof range. Extend. The waterproof sheet 5 is a sheet which is reinforced so as to withstand the driving pressure of the concrete and which is coated with a waterproof material. For example, a fiber reinforced asphalt waterproof sheet, a fiber reinforced bentonite impregnated waterproof sheet, or the like is used.

As a method of attaching the waterproof sheet 5 on the female joint 2 side, for example, as shown in FIG. 2, a plate-shaped waterproof sheet attaching portion 23 is provided on the outer surface A side of the wall body of the female joint 2. A method of sandwiching the edge of the waterproof sheet 5 with the sandwiching plate 24 and fastening it with bolts 25 may be considered. When the waterproof sheet 5 is attached to the male joint 3 side, a method may be considered in which the waterproof sheet 5 is sandwiched between the outer surface of the proximal end of the insertion portion 31 and the sandwiching plate 33, and the bolts 34 are fastened. Note that various other methods can be considered for attaching the waterproof sheet 5, and the method is not limited to the above.

<B> Reinforcement Basket Construction Method Next, a method of constructing the reinforcement cage constructed as above will be described.

(1) Installation of Leading Element, Placing of Concrete Leading element rebar cage 1a equipped with female joint 2 and waterproof sheet 5 is excavated for the leading element at intervals. Build inside and place concrete inside the groove. The waterproof sheet 5 is located on the outer surface A side of the continuous underground wall.

(2) Installation of the trailing element and placing of the concrete The reinforcing element basket 1b for the trailing element equipped with the male joint 3 and the waterproof sheet 5 is used for the leading element excavated at intervals. The waterproof sheet 5 is built in the excavation groove while being positioned on the outer surface A side of the continuous underground wall, and the concrete is placed in the groove.
At this time, the male joint 3 is inserted from the upper end of the slit 21 of the female joint 2 which is built up first, and the rebar cage 1b for the following element is built using the female joint 2 as a guide.

(3) Filling of grout Since the female joint 2 and the male joint 3 are constructed so as to be movable in the length direction of the continuous underground wall, the rebar cage 1b for the trailing element is necessary after being installed. According to the movement, the position is adjusted. Finally, the female joint 2 is filled with the grout 4 and the construction is completed. It is also conceivable that the rebar cage for the preceding element is equipped with a male joint, and the rebar cage for the following element equipped with the female joint is installed using this as a guide.

[0021]

Since the present invention is as described above, the following effects can be obtained. <a> A waterproof sheet can be laid on the entire outer surface of the continuous underground wall,
Moreover, since the water stopping property between the joints is also high, the leakage of groundwater is remarkably reduced from the cracked portion of the concrete of the side wall such as the basement using the main body of the continuous underground wall.

<B> From the above, there is no need for equipment for draining and disposing of leaked water in the wall.

<C> Since groundwater is not supplied to the cracks in the reinforcing bar concrete of the wall body, and the progress of rust in the reinforcing bar is suppressed, it is possible to contribute to ensuring the long-term soundness of the reinforcing bar concrete frame. .

<D> According to the present invention, since the water stopping property of the continuous underground wall is remarkably improved, it can be used also as a water blocking wall used for an underground dam or the like.

[Brief description of drawings]

FIG. 1 is an explanatory view of a reinforcing bar basket of the present invention.

FIG. 2 is an enlarged explanatory view of a joint portion.

Claims (5)

[Claims] 1. A reinforcing bar basket to be built in an excavation groove when constructing a continuous underground wall, wherein adjacent reinforcing bar baskets are connected to both end sides in the length direction of the continuous underground wall of the reinforcing bar basket. Joints are provided, these joints project in the width direction to the vicinity of the outer surface of the continuous underground wall, and a waterproof sheet located along the outer surface of the continuous underground wall is stretched between the joints on both ends. The structure of the rebar cage for continuous underground wall construction, characterized by being configured as follows. 2. The joint comprises a tubular female joint having a slit formed in the depth direction of the continuous underground wall, and a male joint inserted into the female joint through the slit. The structure of the reinforcing bar basket for continuous underground wall construction according to claim 1, wherein the joint is constructed so as not to be pulled out in the length direction of the continuous underground wall. 3. The structure of the reinforcing bar cage for constructing a continuous underground wall according to claim 2, wherein the female joint is formed by filling the male joint with grout. 4. The method for constructing a reinforcing bar cage for constructing a continuous underground wall according to claim 2, wherein a reinforcing bar cage for a preceding element equipped with one of a male joint and a female joint is installed in an excavation groove. When installing a rebar cage for a trailing element equipped with the other of the male joint or female joint, insert the male joint into the female joint through the slit, and use the joint that was built in as a guide. A method for constructing a reinforcing bar basket for continuous underground wall construction, characterized by constructing a reinforcing bar basket for an element. 5. The continuous underground wall according to claim 4, characterized in that after the joint that has been installed in advance is used as a guide, the rebar cage for the trailing element is installed and then the female joint is filled with grout. How to build a rebar cage for construction.