JPS62291319A - Construction of underground wall - Google Patents

Abstract

PURPOSE:To exactly connect unit underground walls by a method in which, the position of coupling claws is actually measured, and a coupler with the coupling claws is welded to the periphery of a steel tube whose periphery is contacted with the position of the coupling claws to make up a steel tubular sheet pile for coupling. CONSTITUTION:A steel tubular sheet pile 9 for coupling is driven while connecting coupling claws 3e1-3h1 with couplers 8a-8d, and an unit underground wall 5a is connected to an underground wall 5b. The sections 10a and 10b of the steel tube 7 with the couplers are excavated and concrete 11 is packed into the excavated holes with the couplers. Excavation is made for the inner grounds 12a and 12b of unit underground walls 5a and 5b and an inner ground 9a of the sheet pile 9 and concrete is placed into the excavated holes to construct a well. Large-size underground wall can thus be constructed in a short time by such a highly strong and reliable coupling method.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] The present invention is equipped with parallel double-arm joints on both sides, which are used in the civil engineering and construction fields! This invention relates to a method of constructing an underground wall made of 21 pipe sheet piles.

[Conventional technology]

In recent years, various structures in the field of civil engineering and construction have gradually become larger in size, and with this, the size of foundations, pond walls, etc. for retaining earth has also become larger.

Therefore, steel pipe sheet piles equipped with parallel double-arm joints on both sides were developed as a structural material suitable for constructing large underground walls, and a method for constructing underground walls by continuously engaging the steel pipe sheet piles was developed. started to be proposed.

That is, in Japanese Patent Application Laid-Open No. 1987-68921, a pipe sheet pile constructed by connecting two water-stop steel plates with joints on both sides with a partition steel plate with joint reinforcing bars protruding from the joints was roughly excavated. A method for constructing a pond wall (hereinafter referred to as invention A) in which concrete is poured after joints are engaged in a groove is disclosed, and JP-A No. 57-100216 discloses a method for constructing a pond wall in which concrete is poured into a groove after a joint is engaged with the groove. and 1. for each of the general holes. VH
A method for constructing a pond wall (hereinafter referred to as Invention B) is shown in which a reference pile made of a steel pipe sheet pile with a shaped steel, that is, a parallel double-arm joint, and a reinforcing bar basket are jointed and inserted, and then concrete is poured.

[Problem that the invention seeks to solve]

The above-mentioned No. 9 B invention provides a construction method capable of forming a large underground wall having a desired strength. Because the plan is to connect the A-pipe tentatively after installing it, it is necessary to perform pre-excavation in advance, and there are various things such as preventing the excavated hole from collapsing, inserting the sheet pile, maintaining its posture, and providing guidance for engaging the joint. There are problems in that it is costly because it requires several steps, and the construction period is relatively long.

Furthermore, the invention methods A and B (for convenience, this is referred to as the excavation method)
Since all of these use steel sheet piles made by welding together four steel plates, it is difficult to use an economical driving method; in other words, when driving, the welded joints tend to break and the web and flange separate. There is a technical problem in that it becomes extremely difficult to engage the joints, making it impossible to construct underground walls.

The purpose of the present invention is to provide a method that enables construction of underground walls using an economical pouring method, and furthermore, it is possible to start construction of underground walls from different points at the same time, and to construct these unit underground walls. This provides a method that allows reliable connection.

[Failure to solve the problem]

The present invention relates to a method for achieving the above-mentioned object, and its gist is a method for constructing a pond wall in which steel pipe sheet piles in which parallel double-arm joints are welded to both sides of a steel pipe body are continuously cast. After actually measuring the position of the engaging claw of the parallel double-arm joint protruding from the connecting wall end of the unit underground wall, the engaging claw is included in the outer circumferential surface of a steel pipe having a circumferential surface substantially circumscribing the position. The method is characterized in that an engaging joint is welded to produce an engaging steel pipe sheet pile, and then the unit underground walls are jointly connected using the engaging steel pipe sheet pile.

[Effect]

Hereinafter, the method of constructing an underground wall together with the W4 pipe pile and the engaging steel pipe sheet pile according to the method of the present invention will be explained along with its operation.

FIG. 2 is a plan view of a steel pipe sheet pile 1 having a parallel double-arm joint used in the present invention, in which joints 38 to 3d made of vertical halves of straight steel sheet piles are attached to corners 2a to 2d of the steel pipe body 2.
The flanges 4a and 4b are welded and joined so as to be located substantially on the same plane to form a steel pipe sheet pile l. Therefore, the joints 3a, 3b, 3c, and 3d protrude from both sides of the steel pipe body 2 and are parallel to each other.In the present invention, the joints 3
a, 3b and 3c, 3d are defined as parallel double-arm joints.

like this! When driving or press-fitting the 21g sheet pile 1 using a hammer or pie break, the steel pipe body 2 has extremely high mechanical strength, so there is very little risk of damage, but the joints 3a to 3d are It may not be strong enough and may be damaged depending on the soil quality.

In the case of such soil, the area where the parallel double-arm joint will penetrate should be softened in advance using an earth auger or jet cutter before pouring or press-fitting, or the steel pipe sheet pile should be
It is desirable to insert an earth auger into the hollow part of the pile and excavate the tip of the sheet pile first.

Moreover, if these are used together, the effect will be even greater.

FIG. 3 is a partial plan view of an underground wall 5 formed by continuously pouring W pipe sheet piles 1a to 1c. As mentioned above, the planned penetration areas 68 to 6d of the parallel double arm joints have been softened in advance, It is constructed by sequentially engaging steel pipe sheet piles 1a to 1c, and the construction period can be shortened to 1/3 to 1/2 compared to the above-mentioned excavation method.

Now, with an underground wall like this, a huge well with 59 sides, for example.
When constructing a well with a depth of 30 m and a depth of 30 m, as shown in FIG. , 5b+ is adopted, but it is extremely difficult with current civil engineering technology to accurately cast the unit underground walls 5a, 5b at the planned construction point, so the wall ends 5a1.5b+ are directly connected. It is not possible to manufacture the steel sheet piles to be connected to the steel sheet piles in advance.

Therefore, the present inventors proposed the above-mentioned wall end 5a as shown in FIG.
+, 5b+ parallel double arm joints 3e, 3f and 3g, 3
After actually measuring the positions of the engaging claw portions 3e+, 3L, 3g++3h+ of h, the steel pipe 7 having a circumferential surface circumscribing the positions is
is selected, and then welded to the outer circumferential surface 7a of the engagement joints 8a to 8d+i'il pipe 7 that encompass the engagement claws 3e+ to 3h+ to fabricate a steel pipe holder 9 for the engagement platform, and Part 3
e, ~3h.

While engaging the engagement joints 8a to 8d, the yielding engagement opening pipe arrow 9
The unit underground walls 5a and 5b were connected, and a large cell was built horizontally.

Next, in addition to the inside 7b of the steel pipe 7, an area 10a surrounded by the outer circumferential surface 7a and the parallel double-arm joints 3e, 3f and 3g, 3h,
10b was excavated including the engaging joint portion, and then, as shown in FIG. 1, concrete or mortar 11 was filled including the engaging portion to complete the closed connection.

Also, at any time before or after this closing connection, the unit underground wall 5a
, 5b and the inner cavity 9a of the engaging steel pipe sheet pile 9 are appropriately excavated and filled with concrete to construct a well.

Although the example in FIG. 1 shows the case where the unit underground walls 5a and 5b intersect at a substantially right angle, it goes without saying that the construction can be carried out in the same way whether they are connected in series or connected by an arc.

〔Example〕

A square steel pipe with a square cross section with a plate thickness of 9I and a side length of 400n was used as the steel pipe body, and a vertical half of a straight steel pipe sheet pile was attached to the corner of the square steel pipe as a parallel double-arm joint as shown in Fig. 2. The steel pipe sheet piles were manufactured by welding.

The vertical half-piece had a plate thickness of 9.5 mm and a length of 198 am from the center of the claw part to the )8 contact surface.

Next, an underground wall was constructed by connecting the steel pipe sheet piles as shown in Fig. 4, and then using a steel pipe with a diameter of 800 mm and a plate thickness of 1271 m, and a grooved pipe with a diameter of 16511 mm and a plate thickness of 11 u+. We tested the closed connection by machining the engaging steel pipe sheet piles, and were able to create a well with strong socket strength in a short construction period as desired.

In particular, when steel pipe sheet piles with such dimensions are adopted, the inner cavities 12a to 121 explained in FIG. It is possible to build something high.

〔Effect of the invention〕

The method of the present invention makes it possible to adopt an economical pouring method, and also provides a method for constructing large underground walls in a short period of time using a strong and reliable joint connection method. The effects are extremely large.

[Brief explanation of the drawing]

Fig. 1 is a partial plan view of a well constructed by the method of the present invention, Fig. 2 is a plan view of a steel pipe sheet pile used in the method of the present invention, and Fig. 3 is a plan view of an underground wall according to the method of the present invention. , FIG. 4 is a plan view showing the situation during construction of the underground wall, and FIG. 5 is an explanatory diagram of the closed connection situation in the present invention. Patent author: Nippon Steel, representative of Taisha Co., Ltd.
Handmade Masu (and 2 others) 5a, 5b: M-position underground wall 9: Engagement pipe arrow 9a: Inner cavity 11: Concrete or mortar 12a~! 21: Internal cavity Figure 2 Figure 3 Figure 5: Underground wall 6a^6d = planned penetration area

Claims (1)

[Claims] 1. A method for constructing an underground wall in which steel pipe sheet piles with parallel double-arm joints welded to both sides of the steel pipe body are continuously cast, the parallel double-arm joints protruding from the connecting wall end of the continuous cast unit underground wall. After actually measuring the position of the engaging claw part of the arm joint, an engaging joint that encompasses the engaging claw part is welded to the outer circumferential surface of a steel pipe having a circumferential surface substantially circumscribing the position, and a steel pipe sheet pile for engagement is manufactured. , and then jointly connecting the unit underground walls with each other using the engaging steel pipe sheet piles.