JP5064261B2 - Steel element construction method - Google Patents

Description

  The present invention relates to a method for constructing a steel element in a lower ground such as a railway track.

  Conventionally, a construction method in which a steel element is constructed in a lower ground such as a railroad track and an underground structure is constructed by a non-opening method is known. The outline of this construction method will be described with reference to FIGS. 7 to 9. As shown in FIG. 7A, the structure construction site below the railroad track 1, the work start shaft and the site where the work shaft is excavated are sandwiched. The earth retaining work 4 is constructed on the ground G, and the inside of the earth retaining work 4 is excavated to construct the start shaft 2 and the reaching shaft 3. As the earth retaining work, steel sheet piles, H-section steel, earth retaining plates, beams and upsets are used. Next, as shown in FIG. 7 (b), the ground G of the structure construction site is either by propelling the steel element P from the start shaft 2 side, or by towing by pulling it from the end shaft 3 side or both. Insert horizontally inside. An excavating mechanism (not shown) such as an auger is provided at the tip of the element P, and propelled or towed while excavating and removing the earth and sand at the tip of the element P by the excavating mechanism. In this way, a plurality of steel elements P are sequentially installed in the ground in a box shape so as to surround the structure construction location.

  As shown in FIG. 8, the steel element is first constructed by moving the reference element 10 at the center of the upper floor slab from the start shaft 2 to the arrival shaft 3. As shown in FIG. 9 (a), the reference element 10 is a tubular steel element having a "B" -shaped cross section, two flat sheet piles 11 having joints 13 at both ends, and two steel plates. 12 are welded in combination in a substantially square shape. After constructing the reference element 10, the general element 20 is constructed on both the left and right sides of the reference element 10. As shown in FIG. 9 (b), the general element 20 is formed by welding two flat sheet piles 21 having joints 23 at both ends and one steel sheet 12 combined in a "U" shape. It is. The general part element 20 adjacent to the reference element 10 causes the joint 23 to be illustrated on the joint 13 of the reference element 10, and this is used as a guide from the start shaft 2 to the arrival shaft 3. Next, the joints 23 of the general part element 20 are connected to each other, and the general part element 20 is sequentially constructed using this as a guide.

Corner element 30 is applied to both ends of the upper floor slab. As shown in FIG. 9C, the corner element 30 is a tubular steel element having a cross-section “B” shape, and is formed by welding four steel plates 31 each having a joint 33 at the end. . The joint 33 is connected to the joint 23 of the general element 20, and this is used as a guide from the start shaft 2 to the arrival shaft 3. Thereafter, in the same manner, new general element 20 is sequentially inserted and installed in the adjacent portion below the corner element 30 that has already been inserted, and in the adjacent location below the general element 20, and the vertical wall The left and right side wall element rows. Next, the joint 23 of the general element 20 is connected to the joint 33 of the corner element 30 at the lower end of the vertical side wall element to form a lower floor slab element row, and is closed at the center of the lower floor slab element row. As a whole, a steel box mold is built in the ground.
JP 2005-282115 A

  Since the conventional steel element construction method shown in Patent Document 1 is constructed by excavating elements one by one, it takes time and effort, and in particular, it takes a lot of time to construct the upper floor slab.

The present invention is intended to solve the above-described problems, and an object of the present invention is to enable high-speed construction of steel elements, particularly high-speed construction of upper floor slab elements.
The present invention is a method of constructing steel elements in the ground, after connecting steel elements to be constructed on the upper slab with joints and arranging them on the start shaft side, after constructing the reference pipe from the start shaft side to the reach shaft side The steel elements on both sides of the reference pipe are paired, and a plurality of steel elements of each pair are alternately pulled or propelled, and a plurality of them are simultaneously constructed.

  According to the present invention, a plurality of elements can be excavated at the same time, so that an upper floor slab element can be applied at a high speed.

  Embodiments of the present invention will be described below. The element construction of the present invention is to construct a start shaft and an end shaft, and sequentially use a steel reference element, a general element, and a corner element from the start shaft side to the end shaft side. Construction of the box shape in the ground is the same as in the case of FIGS. 7 to 9, and in that case, in order to speed up the construction of the element, particularly the construction of the upper floor slab element, it is a diagram except that a plurality of elements are constructed simultaneously. Since this is the same as in the case of FIGS.

FIG. 1 is a diagram for explaining an example of a method for excavating a plurality of elements simultaneously.
As explained in FIG. 8, the start shaft and the reaching shaft are excavated, and the earth retaining work 4 is constructed respectively. Next, as shown in FIG. 1A, a plurality of steel elements, here, four general elements B, C, D, and E are arranged on both sides of the reference element A for convenience of explanation, as shown in FIG. . At this time, the joints of the elements are connected to each other. Next, as shown by the arrow in FIG. 1 (b), the reference element A is dug up with high positional accuracy up to the reaching shaft side. When the length from the starting shaft to the reaching shaft is long, the elements are added on the way. Next, as shown by the arrows in FIG. 1C, the general elements D and E at positions separated from each other on both sides of the reference element A are dug up to a predetermined length at the same time. As will be described later, a propulsion jig equipped with a jack or the like is required for the construction of the element, and when excavating multiple elements at the same time, ensure the installation space for each propulsion jig so as not to interfere with each other. In addition, it is desirable to simultaneously construct elements at remote locations that can be dispersed without locally applying stress to the ground. Of course, depending on the situation at the site, a plurality of adjacent elements may be simultaneously constructed.

  Next, as shown by the arrow in FIG. 1 (d), the general elements D and E are paired with the general elements B and C adjacent to the reference element A and sandwiched between the reference elements A and the general elements D and E. Digging up to the same length as. Thereafter, as shown by the arrows in FIG. 1 (e), the general elements D and E are simultaneously applied, and then the general elements B and C are alternately applied, and the length from the starting shaft to the reaching shaft is increased. If the length is long, add elements along the way to the shaft. Thus, by constructing the two elements simultaneously, it is possible to speed up the element construction of the upper floor slab in particular. In the above description, the general part elements B, C, D, and E are each described as one, but each of B, C, D, and E may be a double element in which two elements are paired. Moreover, although the example which constructs five elements was demonstrated above, when constructing a larger number of elements, you may make it repeat the same construction method as the above, or Fig.1 (a) In the state shown in FIG. 1 (d), the two elements on both sides of the two elements are simultaneously installed, and all the elements are dug to the same length. It is also possible to construct a larger number of elements by repeating.

FIG. 2 is a diagram for explaining another example of a method for constructing a plurality of steel elements simultaneously.
As shown in FIG. 2 (a), the steel element A (reference element) and the general elements B, C, D, and E are arranged with joints connected to each other on the start shaft where the earth retaining work 4 is constructed. This is the same as in the case of FIG. Next, as shown by an arrow in FIG. 2B, the reference element A and the general elements D and E separated by one on both sides of the reference element are paired and simultaneously dug to a predetermined length. As in the case of Fig. 1, the construction of three elements every other one is ensured by securing the installation space for each propulsion jig so as not to interfere with each other, and stress on the ground. This is to disperse. Of course, depending on the situation at the site, a plurality of adjacent elements may be simultaneously constructed.

  Next, as shown by the arrow in FIG. 2 (c), the general element B and C sandwiched between the reference element A and the general elements D and E are paired up to the same length as the general elements D and E. Excavation construction. Thereafter, as shown by the arrow in FIG. 2 (d), the reference element A and the general elements D and E are simultaneously applied, and then the general elements B and C are simultaneously applied alternately to reach the starting shaft. If the length to the shaft is long, add elements along the way to construct the shaft. Thus, by constructing two elements and three elements at the same time, it is possible to speed up the element construction of the upper floor slab in particular. In the above description, the general part elements B, C, D, and E are each described as one, but each of B, C, D, and E may be a double element in which two elements are paired. Moreover, although the example which constructs five elements was demonstrated above, when constructing a larger number of elements, you may make it repeat the same construction method as the above, or Fig.2 (a) In the state shown in FIG. 2 (c), two elements on both sides of the two elements are sequentially installed at the same time, and all elements are dug to the same length. You may make it construct by repeating two excavations.

Next, a double element construction apparatus will be described with reference to FIGS.
FIG. 3 is a schematic explanatory view of an example of a construction apparatus, FIG. 3 (a) is a front view showing the concept of the apparatus, and FIG. 3 (b) is a front view showing a state in which a double element is set. This device has a structure in which a steel tie rod is stretched through the ground between the excavated start shaft and the end shaft, and the steel elements are excavated by pressing the tie rods between the earth retaining members of each shaft. In this example, it is a device for propelling a double element in which two elements are paired, but of course, it may be configured to propel a single element. As shown in FIG. 3A, the steel tie rods 100 are stretched one by one on the top and bottom of the element, and here are double elements 120. Therefore, four tie rods are provided on the top and bottom to support the element propulsion. The pressure plate 110 is inserted. As shown in FIG. 3 (b), the double element 120 is placed on a receiving girder 130 made of H-shaped steel provided on the start shaft side by connecting the joint 121 to the adjacent element, and as will be described later. The pressure plate 110 is used as a reaction material for propulsion.

FIGS. 4A and 4B are diagrams showing an example in which an element is pushed by a jack using a bearing plate as a reaction force member, FIG. 4A is a front view, and FIG. 4B is a side sectional view.
The steel double element 120 is placed on the receiving girder 130 with the joint 121 connected to the joint of the adjacent element, and is arranged at the position of each tie rod by the bearing plate 110 through which the upper and lower four tie rods 100 are inserted. It is propelled by pushing the rear end with four jacks 140.

FIGS. 5A and 5B are diagrams showing another example of propelling an element using a bearing plate as a reaction force member, FIG. 5A is a front view, and FIG. 5B is a side sectional view.
The steel double element 120 is placed on the receiving beam 130 with its joint 121 connected to the joint of the adjacent element, and the upper and lower four tie rods 100 are fixed to the inserted pressure bearing plate 110. The jack 140 is provided between the bearing plate 110 and the rear end of the double element 120, and the double element 120 is propelled by using the bearing plate 110 as a reaction force material.

FIG. 6 is a side sectional view for explaining an example of propelling an element.
The tie rod 100 is stretched over and under the steel element through the earth retaining 150 reinforced by the flank 151. The tie rod 100 is inserted through the support plate 110 and the jack 140, and the rear end of the double element 120 placed on the receiving girder 130 is pushed by the jack 140 by using the support plate 110 as a reaction material, and is propelled through the earth retaining member 4. . A blade edge portion 125 is provided at the tip of the double element 120 and is propelled while excavating and discharging the ground at the tip. The stroke of the bearing plate 110 is up to the earth retaining 4, and when the propulsion distance is long, the elements are added and excavation propulsion is performed by returning the position of the bearing plate 110 to the original position. In addition, since a plurality of elements are towed or propelled at the same time, there is a possibility that the trajectory moves laterally (the trajectory moves in the element direction) due to the frictional force between the element and the ground. Therefore, in order to reduce the friction between the element and the ground, for example, it is desirable that the friction reducing member 120a such as a thin steel plate is arranged on the upper surface of the element while being fixed to the earth retaining member.

It is a figure explaining an example of the method of excavating a some element simultaneously. It is a figure explaining the other example of the method of excavating a some element simultaneously. It is a schematic explanatory drawing of the example of a construction apparatus. It is a figure which shows the example which pushes an element by using a bearing plate as a reaction material. It is a figure which shows the other example which propels an element by using a bearing plate as a reaction material. It is a side cross section explaining the example which pushes an element using a bearing plate as a reaction material. It is a figure explaining the construction method which builds an underground structure by a non-cutting method. It is a figure explaining construction of steel elements. It is a figure explaining the example of steel elements.

Explanation of symbols

A, B, C, D, E ... steel element, 4 ... earth retaining, 100 ... tie rod, 110 ... bearing plate, 120 ... double element, 121 ... joint, 125 ... blade edge part, 130 ... girder, 140 ... Jack, 150 ... earth retaining, 151 ... upset.

Claims (1)

In the method of constructing steel elements in the ground,
The steel elements to be constructed on the upper floor slab are connected with joints and arranged on the start shaft side, and after the reference pipe is constructed from the start shaft side to the arrival shaft side, the steel elements on both sides of the reference pipe are used as a pair. A steel element construction method, wherein a plurality of steel elements are alternately towed or propelled to construct a plurality at the same time .

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