JPH02289721A - Detachable large bracing block - Google Patents

Abstract

PURPOSE:To enlarge a bracing block and facilitate handling thereof by forming the block with a structure block and a raising material, and disassembling the two materials at the time of transportation, and attaching the raising material to a fitting surface side of the structure block at the time of use, and fastening them with bolts and nuts to be unified. CONSTITUTION:A bilateral pair of inclined materials 12, 12 and a straight material 11 are positioned on one straight line, and they are welded for fixation with a fitting surface plate 13 to form a structure block 10. Both end surfaces of a H-type steel are cut diagonally, and reinforcing plates 22, 23 are welded to it to prepare a raising material 20 for abutting on the front surface of the fitting surface plate 13. At the time of transportation, the block 10 and the material 20 are handled under the condition that they are mutually disconnected. At the time of practical use, the block 10 and the material 20 are fastened together through bolts and nuts 30 to function it as one bracing block. Consequently, a bracing block can be enlarged and handling thereof is facilitated.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a construction material for heap retaining used at civil engineering construction sites, and in particular, it is easy to assemble on site and mainly has a relatively short span between struts. This relates to a large, prefabricated flint block suitable for use in large areas.

[Conventional technology] Regarding the flint materials used in mountain retaining work, the construction method of assembling H-beams on site each time has gradually become obsolete, and in recent years, due to the demand for labor saving, pre-integrated so-called blocks have become obsolete. Many forms have come to be used. The present inventors have also previously proposed an integrated flint block made by improving the prior art (see Japanese Utility Model Application Publication No. 120533/1983). However, this method still has the following problems to be solved, and further improvements are desired. In other words, if we consider the past performance by focusing on the strut span (distance between struts) when constructing mountain retaining, we find that when the span is less than 6,000 m, approximately 60% of the total number of construction works
．． It was found that relatively wide strut spans are often requested, with approximately 40% of the spans being 0m or more.

If the span is 6.0 m or less, a flint block such as the one proposed in the previous design will sufficiently meet the requirement, but if the span is 6.0 m or more, transportation by truck is required as described below. Due to the above limitations, the improved type of the prior design could not be put to practical use.

First, this point will be explained. As shown in Figure 7, the length of the integrated flint block (if P' is the installation distance to the strut, the length of the straight member 1 shown as P -1- P')
is limited by the loading bed width of the transport truck (usually 2.0 to 2.3 m), so this has to be set to a maximum of 2.0 m, and as a result, it is difficult to install from a point where θ = 45°. The length Q1 of the face material 2, that is, the contact width Q with respect to the rib 4 could not be set to 3.0 m or more. Generally, the larger the value of the abutment width Q, the wider the strut span can be set, but as mentioned above, conventionally, this has been set to 3.0 m or more. Therefore, the span was only 6.5 m at most, and it was not possible to meet the demand for a strut span of 6.0 m or more, which accounts for about 40% of the number of construction projects. In other words, if the strut length is increased to 6.5 m or more, the bending strength of the vent will not be maintained unless the length of the mounting surface material is correspondingly increased. This caused the problem that the size had to be increased by one rank.

[Means for Solving the Problems] Here, the present invention comprises a flint block consisting of two members: a structure block assembled in a triangular shape in advance, and a geta material attached to the horizontal body block. When transporting by truck, the dimensions must be such that it fits within the width of the loading platform.
On the other hand, when actually used, a separately prepared geta material is attached to the mounting surface side of the structure block, and the two are joined together with bolts and nuts to form a large-sized wood block as a whole. This block is intended to solve the above-mentioned problems.

[Function] According to the present invention, a bulky flint block is composed of two members consisting of a triangular structure block and a rectangular geta material, and when transported, these two members are disassembled from each other. By making it possible to handle it with 1. The restriction due to the width of the rack loading platform does not become a problem, and in actual use, the above-mentioned two can be integrated by tightening bolts, thereby making it possible to handle them as one flint block. The aim was to provide a large flint block that would function well and at the same time satisfy a strut span of 6.0 m or more.

The flint block of the present invention can be easily assembled and disassembled on-site, since it is only necessary to attach a rectangular geta material to a triangular structure block and fasten it with bolts and nuts. It is not necessary.

[Embodiments] Figures 1 to 3 show various embodiments of the present invention.
is a geta material attached to the horizontal body block, and the flint block of the present invention is composed of two members, the above-mentioned body block and geta board. As shown in the figure, the structure block consists of a pair of left and right diagonal shrines 12. which are connected to both wings in a V-shape, with the axis of symmetry being a straight member 1l arranged perpendicularly to the ventricle. 12, and the end faces of the diagonal members 12 and the end faces of the straight members 11 are positioned in a straight line and fixed together by a single mounting face plate l3, and for fixing, welding means is used. It is allowed to use. As described above, a generally triangular horizontal block IO is formed, and on the other hand, a getter material 20 is prepared to be brought into contact with the front surface of the mounting face plate 13 of this block.

This geta material is made by cutting a straight H-beam to a length slightly longer than the mounting face plate l3, and then cutting both end faces diagonally, and then adding a reinforcing plate 22 and 23 is welded, and the play 1 is arranged so as to fit between the flanges 21a of the H-section steel. Incidentally, the code 2lb is the web portion of the H-shaped steel.

The embodiment shown in FIG. 2 is based on the structure block 10 of FIG.
In place of the mounting face plate 13 in , a mounting face material l4 made of H-beam steel is welded, and reinforcing plates 15 and 16 are welded between the flanges at the ends and center of the face plate, respectively. You can leave it there.

The body block shown in FIG. 3 is exactly the same as that shown in FIG. 2, and only the structure of the getter material differs. In other words, this is an example in which the shape of the end of the straight H-shaped steel constituting the geta material 20 is cut at right angles to the flange surface of the H-beam as shown by reference numeral 24. The shape can be set freely. 4 and 5 show the case where the structure block 10 shown in FIG. 2 and the getter material 20 are integrally fastened via bolts and nuts 30. FIGS. In order to facilitate the above-mentioned fastening work and the fastening work when setting the flint blocks integrated in the above-described manner on the vent, in the present invention, the flange surface 21 of the geta material 20 is
The mounting hole 25 to be drilled for the hole a is a slotted hole as shown in FIG. 5 or a long hole as shown by reference numeral 27 in FIG.

As shown in Figure 12, there is usually 1001 m in the
Or, a bolt hole 26 for attaching a flint block is drilled with a constant pitch A of 150 rats. Normally, a mounting hole with a position and diameter corresponding to this bolt hole should be formed on the side of the flint block, but
In the present invention, the mounting holes corresponding to the bolt holes are elongated holes. That is, as shown in Figure 6,
A long hole 27 having a short axis of d and a long axis of (A+d) is bored in the flange surface 21a of the getter material 20. Incidentally, the above d is the diameter of the bolt hole in the rib 4, and A is the pitch of the bolt hole in the rib 4.

If the mounting hole is configured as described above, even if the bolt hole 26 provided in the rib 4 at the location to be constructed does not match the mounting hole 25 in the flint block, the installation will be easy. If the holes are long holes with the pitch shown above, even if the axis of the strut is slightly twisted, or the hole pitches of the mounting holes and bolt holes are misaligned, Even if there is a problem, there is no need to create a new gas hole (re-drill the hole), and the bolt hole 26 of the ventilator and the mounting hole 25 can be held in any position so that they pass through at any time, so it is easy to install the gas hole. Improves work efficiency.

Next, specific examples of the reinforcing plate mentioned above will be explained in detail. In the examples shown in Figures 1 to 4, between the flanges of the H-shaped steel that constitutes the geta material, that is, the H-shaped steel has a vertical flange 21a and a horizontal web 2lb. In the example, the flange 21a. 21a
The ridge plates 22 and 23 are welded so as to close the space between them, thereby supporting the load applied in the axial direction of the straight member 11 and the diagonal member 12 connected to the strut.

However, this reinforcing plate may have the following configuration. That is, as shown in FIGS. 8 and 9, rectangular reinforcing plates 28a and 28b may be inserted and welded in the vertical direction. When the reinforcing plate 1 is installed horizontally, more steel is used than in the case described above, but the plates 22 and 23 absorb the load transmitted from the strut across the entire width of the plate. Since it is possible to distribute the load, it is preferable compared to a vertical plate where the load is concentrated.

The embodiment shown in FIGS. 10 and 11 is an example in which a steel material with a T-shaped cross section is used as the reinforcing plate, and this is inserted and welded into the opening surface of the H-shaped steel in the geta material 20, with reference numeral 28c,
A case is shown in which plates having a T-shaped cross section as shown by 28c are fitted into the opening surfaces of the H-shaped steel from the top and bottom separately and welded.

Incidentally, the member indicated by the reference numeral 31 in FIGS. 8 and 9 is a reinforcing rib provided to strengthen the connecting end surface of the straight member it connected to the strut.

The prefabricated large flint block of the present invention has the above-described configuration, and in use, as described above, first the structure block 10 and the geta material 20 are fastened with bolts and nuts, and the fourth Integrate as shown in the figure. Next, as shown in FIG. 12 and FIGS. 13A-13C, this integrated block is fixed at a predetermined mounting position on the ventricle 4. For fixing, the mounting member 20 on the flint block is fixed. is applied to the rib 4, and fixed by sewing bolts and nuts through the bolt holes 26 drilled in the rib and the mounting holes 25, 27, etc. provided in the geter material. Once the flint block is attached to the rib on one wall in this way, the integrated flint block of the present invention is set to the rib on the opposite side in the same manner as described above. In this way, these integrated flint blocks are constructed via the struts 9 between the ribs 4.

[Effects of the Invention] Since the prefabricated integrated flint block of the present invention has the above configuration, it exhibits the following effects.

As mentioned above, when erecting struts in mountain retaining work, it is desirable to keep the distance between the struts (strut span) as wide as possible. The wider the span, the more work space available for soil excavation, which helps improve the efficiency of construction work.

However, the wider the span, the greater the bending moment applied to the span in proportion to the square of the span (stripe beam span), so the flint block also needs to be larger, and the weight accordingly increases. This also results in inconvenience in handling the cargo during transportation, as well as inability to fit within the width of the truck bed. On the other hand, the flint block of the present invention can simultaneously satisfy the two contradictory requirements mentioned above. That is, the entire flint block is made up of two members: a triangular structure block 10 and a rectangular geta material 20 that is separate from the block.
Since the two members can be separated into individual parts during transportation, the structure blocks can be made smaller and fit within the width of the truck bed, which is a restriction during transportation.On the other hand, in actual use, the structure blocks Since the and geta wood can be integrally connected with bolts and nuts, it can be made into one large flint block, and thereby the mountain retaining work with the wide strut span described above can be carried out.

This point will be explained in detail below. A conventionally known integrated flint material (see Fig. 13A) and a flint block according to an earlier design developed by the present inventor (Utility Model No. 62-12)
Compared to the flint block according to the present invention (see Fig. 13c), which is described in No. 0533 (see Fig. 13B), a significantly larger strut span can be obtained.

Now, how wide a span can be set by using I1-300 H-beam steel, which is the most typical type of mountain retaining material, for the risers and struts? The graph (15th
(see figure). In this figure, the vertical axis is the strut span, and the horizontal axis is
Taking the reaction force applied to the upright, and assuming the H-section steel is 300 as mentioned above, the span that can be erected is divided into practical values of spans of 7.5 m or less and reaction forces of 10 to 20 t/m. This is the graph when As is clear from the graph, the entire span that can be constructed is ΣA = A 1 + A2
+A3 + A4, whereas the contact width of the conventional flint block is Q as shown in Figure 13A, so the strut span that can be erected at that time is A+ /ΣA=5
0%, which means that only about half of the theoretical value can be satisfied. On the other hand, an earlier design (No. 13B) that improved the conventional type
Even in the case of (see figure), (AI + A2 ) /ΣA = 74%, which is only about 70% satisfied. On the other hand, the flint block of the present invention has (AI + A2 + A3 ) /ΣA = 99%, which means that it can cover almost the entire span that can be erected, so it is clear that it has a high practical advantage.

In the integrated flint blocks depicted in each of the above drawings, the individual members that make up each block, such as straight members, diagonal members, mounting members, and geta members, are replaced by plate-shaped mounting face plates (see Fig. 1). (see code 13), all of these shall be made laterally using H-beam steel of the same size (in that case, the width of the flange is B), and the bending span D for the rib 4 shall also be the same value. Then, as is already clear, the relationship between the contact widths Q, Q' and Q'' of the mounting members in each block is as follows: Q<Q'<Q''=Q'+28=Q+4B. As a result, the relationship between the struts L1, L2, and L3 that can be set when both flints are constructed is Ll<L2<
It becomes L3, and when we add the value of B to this, we get L + + 2 8 = L 2 , L 2
+ 2 8 = L 3, therefore L3 =
L+ +4B, and the strut span can be made wider by 4B compared to L1. The specific numerical values of the area surrounded by the span are as shown in Table 1 below. As shown by listing specific figures in the column of area increase rate in the same table, according to the present invention, the working area for earth and sand excavation (
(See the hatched area in FIG. 14) can be significantly increased compared to the previous example.

In addition, Table 2 shows specific data when compared with the prior design shown in FIG. This shows that it is possible to realize wide strut beams.

Margin below c4. Moreover, this type of flint block necessarily requires a connection allowance P′ for the strut (according to the Occupational Safety and Health Regulations,
(It is mandatory to attach a plate to the connecting part of the strut and fasten it with bolts.) Therefore, the abutment width cannot be set by ignoring this connection allowance. Taking this point into consideration, the following significant difference is brought about between the preceding example and the present invention in the length P of the straight member for connection with the strut, which has a significant effect on downsizing of the flint. In other words, since both require the same connection length P', the length of the entire main material is p+p.
If ' is constant, the present invention can increase the contact width by 2B.

In other words, if the contact width is the same, the length of the main material can be shortened, and the overall bulk of the flint block (
By reducing the size (size), further miniaturization and weight reduction can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of an assembled large flint block according to the present invention, with the structure block and geta material being drawn with a slight distance between them. 2 and 3 are plan views showing another embodiment with the same configuration as in FIG. FIG. 5 is a front view showing the mounting surface of the geta material, FIG. 6 is a partially enlarged front view of the mounting surface, and FIG. 7 is a plan view showing the state in which the flint blocks are loaded on a truck. Fig. 8 is a plan view of a flint block showing another embodiment of the present invention, Fig. 9 is a side view of the same, and Fig. 10 is a partially cutaway front view showing another embodiment of the reinforcing plate attached to the geta material. ,
Fig. 11 is a perspective view showing the reinforcing member in the above embodiment, Fig. 12 is a perspective view showing the case where the flint block of the present invention is used for mountain retaining work, Fig. 13A to 13c
The figure is a plan view for explaining the relationship between the bending spans applied to the breech and the relationship between the strut spans when a conventional flint block and a flint block of the present invention are constructed. Fig. 15 is an explanatory plan view of a mountain stop using each flint block, where the vertical axis is the span of the strut, the horizontal axis is the reaction force applied to the breech, and when II-300 H-beam steel is used. 2 is a graph showing the relationship between the reaction force of IO...Structure block, 20...Geta material, U...
Direct material, 12... Diagonal material, 13... Mounting face plate, 14...
...Mounting member, 15. l6.22, 23,... Reinforcement plate, 28... Reinforcement rib, 26... Bolt hole, 25.27... Mounting hole (long hole), Figure 1 Figure 2 Figure Figure Figure Figure 13B Figure 13C Figure 13C

Claims (1)

[Scope of Claims] 1. Consisting of two members: a structure block assembled in advance in a triangular shape and a geta material attached to the structure block, and when transported, the two members are disassembled and stored on a loading platform. On the other hand, an assembled large flint block characterized in that when in use, a geta material is attached to the mounting surface side of the structure block and integrated by tightening bolts. 2. The structure block consists of a straight member made of H-shaped steel, a diagonal member made of a pair of left and right H-shaped steel arranged in a V-shape on both wings with the direct member as the axis of symmetry, and both ends of the diagonal member. The ends of the direct members are welded with a straight mounting face plate or a mounting member made of H-shaped steel, and on the other hand, it is removable from the mounting face plate or the mounting member made of H-shaped steel in the structure block. A large, prefabricated flint block characterized by a combination of geta materials made of H-beam steel. 3 Reinforcement plates are welded horizontally to both ends and the center of the mounting member in the structure block in such a manner as to close the opening surfaces of the H-beams constituting the mounting member, and the diagonal members and straight members are welded horizontally. 3. The assembly type large flint block according to claim 1 or 2, wherein the load applied in the axial direction of the block is supported by a member having a box-shaped cross section by the mounting member and the reinforcing plate, respectively. 4. The assembly according to any one of claims 1 to 3, wherein reinforcing plates are welded horizontally to both ends and the center of the H-shaped steel constituting the geta material so as to be sandwiched between both flanges of the H-shaped steel. A large flint block. 5. When the diameter of the bolt hole of the raised bolt hole is d and the bolt hole pitch is A, at least the contact surface of the geter material of the mounting face plate or the mounting member in the structure block and the flange surface of the H-beam steel constituting the geter material, 5. The large prefabricated flint block according to any one of claims 1 to 4, wherein a plurality of mounting holes are bored, each consisting of a long hole having a major axis of A+d and a minor axis of d.