JPH11173066A - Steel-structural element and construction of underground structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lessen the possibility to disturb a natural ground and deform railways or the like on the ground surface by fitting joints at the four corners of a square steel pipe and fitting them to joints of an adjacent element and distibuting a load at the joints. SOLUTION: Sufficiently strong joints 2 are fitted to the four corners of a square steel pipe 1 along the longitudinal direction of the steel pipe 1 by partial or full-length welding. The joint 2 that a hook-shaped projection 2a and a T-shaped projection 2b are combined, is used. That is, the projection 2b is inserted in the projection 2a and elements are slid along these projections as guides and inserted into ground in sequence. When a tensile force or the like works between these elements, the load is distributed in the joints 2. Shrinkage-compensating mortar, concrete, or the like are charged in the joints when it is required. In this way, PC steel members are not required to be disposed and a member equivalent to a reinforced concrete slab can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel element having a joint capable of transmitting sufficient strength used for building an underground structure without excavation, and a method of building an underground structure.

[0002]

2. Description of the Related Art
Various methods have been proposed and used as a method of constructing an underground structure without excavation under a railway line, a road, or the like. For example, as a method of receiving a track with a construction girder and excavating underneath to create an underground structure, or a method of constructing an underground structure without touching the track, a method of inserting elements into the ground has been used. I have. In particular, when the earth cover is small, a method is used in which a steel or concrete element is propelled or inserted into the ground by towing, and a box is constructed using the element as a part of the main body. In addition, a method is also used in which a reinforced concrete box manufactured outside is constructed by propelling or towing it in a form replacing the above element.

In the construction method in which the element inserted into the ground is used as a part of the main body, prestressed concrete (PC) is used to prevent deformation of the track, especially when the scale is large.
It was necessary to have a structure, and it took a lot of labor and time to arrange the PC steel for that purpose.

In the method of replacing the element with a box made of reinforced concrete manufactured outside, the moving structure is huge, so that the ground is disturbed and the track on the ground surface is deformed. There were many things.

[0005] The present invention has been made to solve the above-mentioned problems, and a method of using an inserted element as a main body includes:
It is an object of the present invention to provide a method of constructing an underground structure which does not require the elements to have a PC structure and has a low possibility of disturbing the ground or causing deformation of a track or the like on the ground surface.

[0006]

SUMMARY OF THE INVENTION According to the present invention, joints having high strength are attached to the four corners of a rectangular steel pipe along the longitudinal direction to be fitted to joints of adjacent elements, and the load is shared by the joints. It is characterized by. Also, the present invention
The length of the joint in the radial direction of the steel pipe is different between the upper and lower portions of the steel pipe, and the cross-sectional shape of the square steel pipe is trapezoidal.
The joint portion is filled with non-shrink mortar, concrete, or the like. Further, the present invention provides a steel element having a joint having high strength attached to the four corners of a rectangular steel pipe along the longitudinal direction, fitting the joints to each other, and sequentially inserting the steel element into the ground. The underground structure is constructed by using the element inserted into the ground to protect the load by sharing the load.

[0007]

Embodiments of the present invention will be described below. FIG. 1 is a view showing an example of a steel element of the present invention, FIG. 2 is a view for explaining joining of steel elements, and FIG. 3 is a view showing an example of a joint. The element of this example uses a square steel pipe 1 of the same size as that conventionally used, and joints 2 having sufficient strength and strength are provided along the length of the steel pipe 1 at the four corners. It is attached by welding or the like over the entire length or a part thereof. Joint 2
It has a function as a guide for an adjacent element and a function to share a load when the element is inserted into the ground.

For example, as the joint 2, a combination of a hook-shaped projection 2a and a T-shaped projection 2b as shown in FIG. 2 is used, and the T-shaped projection 2b is inserted into the hook-shaped projection 2a. Are slid as guides to sequentially insert the elements into the ground, and when a tensile force or the like acts between the elements, the load is shared by the joint 2.

The joint 2 having sufficient strength and proof strength is, for example, a commercially available straight steel sheet pile joint as shown in FIG. 3 (FIG. 3).
(A)), pipe joint (FIG. 3 (b)), hook joint (FIG. 3
As shown in (c)), joints A, B, and C are filled with non-shrink mortar, concrete, and the like as necessary. Since the joint 2 having such a structure does not lose its fitting portion, even if a tensile load or a compressive load acts on the steel element, it can sufficiently withstand this.

FIG. 4 is a view in which the steel elements of FIG. 1 are joined. By fitting and using the joint 2 as shown in FIG. 3 and sequentially inserting and embedding the square steel pipe 1 into the ground as a guide, a slab (plate) having a combination of elements as shown in FIG. ), And by forming this slab in a box shape (horizontal direction and vertical direction), a box culvert (box type underground structure) can be constructed. I do.

[0011] The slab shown in FIG.
When a load is received, the lower joint bears a tensile load, and the upper joint bears a compressive load. When a load is received from a lateral direction (parallel direction), the joint part bears a tensile load or a compressive load. In this case, if the proof stress against the load is insufficient, concrete can be filled inside the element,
The joint is filled with mortar or concrete so as to take charge of this. In this way, it is possible to sufficiently form a part of the main body without using a PC steel material, and since the size of the element may be the same as that of the conventional one, the ground may be disturbed or the ground may be disturbed. The possibility of causing deformation on the surface line or the like is small.

FIG. 5 is a view showing another example of the steel element of the present invention, and FIG. 6 is a view in which the elements of FIG. 5 are connected. In this example, the length of the joint to be attached to the square steel pipe 1 is changed between the upper joint 3 and the lower joint 4, and by thus changing the length of the upper and lower joints, a part of FIG. As shown in the figure, when these are joined together, they can be formed into a circular shape, so that a tunnel or the like can be constructed and used as a part of the main body. Also in this example, the joint shown in FIG. 3 is used, and the load is applied to the joint in the same manner as in FIG.

FIG. 7 is a view showing another example of the steel element of the present invention, and FIG. 8 is a view in which the elements of FIG. 7 are connected. In this example, a steel pipe 5 having a trapezoidal cross section is used, and all the joints 6 attached thereto have the same length, and as shown in FIG. A tunnel or the like is constructed as in the case of FIG. 6, and can be used as a part of the main body. In addition,
Responsible for the load in the joint portion is the same as in FIG.

As described above, by changing the joint length or changing the cross-sectional shape of the steel pipe, the structure can be freely changed to a slab, a box, a circle, an ellipse, or the like. Can be.

[0015]

Conventionally, several methods of constructing an underground structure using a steel element having a joint have been proposed and used, but all of them apply a load such as a tensile force between elements to the joint. There was no such construction method. for that reason,
Structural considerations are required, such as a PC structure to prevent the occurrence of tensile stress, etc., which is disadvantageous both economically and in terms of construction period. On the other hand, according to the present invention, it is possible to bear the generated stress in the steel pipe and the joint portion of the element, so that it is not necessary to dispose the PC steel material, and it is disposed in the ground by propulsion or towing while engaging the joint of the element. If necessary, a member equivalent to a reinforced concrete slab can be manufactured only by filling concrete or the like inside a steel element and a joint portion. Also, since the steel element used can be of the same size as that used conventionally, the possibility of disturbing the ground is small, and the possibility of causing deformation on the ground line etc. small.

[Brief description of the drawings]

FIG. 1 is a view showing one example of a steel element of the present invention.

FIG. 2 is a diagram illustrating joining of steel elements.

FIG. 3 is a diagram showing an example of a joint.

FIG. 4 is a diagram in which the elements of FIG. 1 are connected.

FIG. 5 is a view showing another example of the steel element of the present invention.

6 is a diagram in which the elements of FIG. 5 are connected.

FIG. 7 is a view showing another example of the steel element of the present invention.

8 is a diagram in which the elements of FIG. 7 are connected.

[Explanation of symbols]

 1, 5 ... square steel pipe, 2, 3, 4, 6 ... joint.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Motoko Matsuzawa 2-1-2-2 Yoyogi, Shibuya-ku, Tokyo East Japan Railway Company

Claims (5)

[Claims] 1. A steel element characterized in that joints having high strength are attached to the four corners of a rectangular steel pipe along the longitudinal direction and fitted with joints of adjacent elements so that a load is shared by the joints. 2. The steel element according to claim 1, wherein the length of the joint in the radial direction of the steel pipe differs between upper and lower portions of the steel pipe. 3. The steel element according to claim 1, wherein the rectangular steel pipe has a trapezoidal cross section. 4. The steel element according to claim 1, wherein said joint portion is filled with non-shrink mortar, concrete or the like. 5. A steel element having strong joints attached to the four corners of a rectangular steel pipe along its longitudinal direction is fitted into each other and inserted into the ground one after another, and a load is applied to the steel pipe and the joint of each element. A method of constructing an underground structure, wherein the underground structure is constructed by using the element inserted into the ground as a protective body and using an element inserted underground.