Holding tool for liner plate, liner plate assembly, and installation method thereof

Abstract

To provide a holding tool capable of easily and stably holding a liner plate assembly installed in a vertical pit, the liner plate assembly provided with the holding tool, and an installation method thereof.SOLUTION: A holding tool 10 is provided with: a fixation member 11 clamped with a pair of vertical flanges provided to respective liner plates adjacent to each other and detachably attached to the pair of vertical flanges with a connection metal fitting connecting the pair of vertical flanges; and a jack base 12 provided on the fixation member 11 so as to extend downward for the fixation member 11 and allowed to be installed on the ground surrounding a vertical pit.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a liner plate holder, a liner plate assembly, and an installation method thereof. [Background technology]

[0002] Liner plates are sometimes used to prevent shaft collapse. To prevent the liner plates from falling, a common construction method is to pour concrete around the exposed portion of the liner plate above ground. However, this method requires a lot of time and cost for transporting, curing, dismantling, and disposing of the concrete. This is particularly problematic when digging shafts in mountainous areas. Therefore, construction methods using other means to prevent the liner plates from falling are being considered. For example, Patent Document 1 discloses a construction method in which a plurality of fixing brackets are attached at intervals around the upper end of a cylindrically assembled liner plate assembly so as to extend radially of the liner plate assembly. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 58-73624 Summary of the Invention [Problem to be solved by the invention]

[0004] In the construction method of Patent Document 1, the plate-shaped portion of the fixing bracket is fixed to the upper end of the liner plate assembly by a bolt extending downward. Therefore, if an unexpectedly large load is applied to the fixing bracket, the bolt may come loose due to the axial load, making it impossible to prevent the liner plate from falling.

[0005] The present invention has been made based on this background, and aims to provide a holder that can easily and stably hold a liner plate assembly installed in a vertical shaft, a liner plate assembly equipped with such a holder, and an installation method thereof. [Means for solving the problem]

[0006] In order to achieve the above object, the holder according to the present invention comprises: a fixing member sandwiched between a pair of vertical flanges provided on adjacent liner plates, and detachably attached to the pair of vertical flanges by connecting fittings that connect the pair of vertical flanges; A leg member provided on the fixed member so as to extend downward relative to the fixed member and capable of being placed on the ground around the shaft; Equipped with. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a holder that can easily and stably hold a liner plate assembly installed in a vertical shaft, a liner plate assembly equipped with the holder, and an installation method thereof. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view showing a configuration of a liner plate assembly according to an embodiment of the present invention; [Figure 2] FIG. 2 is a perspective view showing the configuration of a liner plate according to the embodiment of the present invention. [Figure 3] 1 is a perspective view showing a configuration of a holder according to an embodiment of the present invention. [Figure 4] 4 is a cross-sectional view of the holder of FIG. 3 taken along line AA. [Figure 5] 1 is a plan view showing a configuration of a holder according to an embodiment of the present invention. [Figure 6] 1(a) to 1(d) are diagrams showing the steps of a method for installing a liner plate assembly according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, a liner plate holder, a liner plate assembly, and an installation method thereof according to an embodiment of the present invention will be described in detail with reference to the drawings. In each drawing, the same or equivalent parts are designated by the same reference numerals.

[0010] The liner plate assembly according to the embodiment is an assembly in which multiple liner plates are assembled in a ring shape and installed in a shaft to prevent the shaft from collapsing. The liner plate assembly according to the embodiment is attached to the step of the liner plate above ground level and is equipped with a retainer that transfers the load from the liner plate assembly to the ground, thereby preventing it from falling into the shaft by utilizing the bearing capacity of the ground.

[0011] As shown in Figure 1, the liner plate assembly 1 comprises a plurality of liner plates 2, each formed in an arc shape and arranged circumferentially to form a ring, and a plurality of retainers 10, supported by adjacent pairs of liner plates 2 and spaced apart circumferentially so as to extend outward from the liner plates 2, to prevent the liner plates 2 from falling into the shaft.

[0012] As shown in Figure 2, the liner plate 2 is a component in which a rectangular plate material is curved into an arc and flanges are provided on all four sides of the plate material. The liner plate 2 is made of steel, and the plate material is corrugated in the longitudinal direction to provide strength. The flanges of the liner plate 2 consist of horizontal flanges 2a provided at the upper and lower ends that face each other in the width direction, and vertical flanges 2b provided at the left and right ends that face each other in the longitudinal direction. The horizontal flanges 2a and the vertical flanges 2b each have a plurality of through holes 2c formed at intervals so that bolts can be inserted therethrough.

[0013] The annular liner plate assembly 1 is assembled by arranging multiple liner plates 2 and connecting them using bolts and nuts. Specifically, a single-tier annular assembly can be constructed by arranging multiple liner plates 2 in the circumferential direction, inserting bolts into each through-hole 2c in the vertical flanges 2b of adjacent liner plates 2, and tightening the bolts with nuts. Alternatively, multiple tiers of annular assemblies can be constructed by arranging liner plates 2 in the vertical direction, inserting bolts into each through-hole 2c in the horizontal flanges 2a of adjacent liner plates 2, and tightening the bolts with nuts.

[0014] As shown in Figure 3, the retaining device 10 comprises a fixing member 11 that can be detachably attached to the vertical flange 2b of the liner plate 2, and a jack base 12 that is attached to the fixing member 11 so as to extend downward relative to the fixing member 11 and that can lift the fixing member 11 while it is placed on the ground around the shaft.

[0015] The jack base 12 is an example of a leg member that can be installed on the ground around a shaft. The jack base 12 includes a threaded pipe 12a with a threaded outer surface, a handle 12b that can adjust the position of the threaded pipe 12a in the longitudinal direction by rotating a nut screwed onto the threaded pipe 12a, and a base 12c that is provided at the end of the base end of the threaded pipe 12a and can be placed on the ground. The threaded pipe 12a is an example of a shaft member that is attached to the fixed member 11 and supports the fixed member 11.

[0016] The fixing member 11 is a member that transmits the load from the liner plate 2 to the jack base 12. The fixing member 11 includes a plate-shaped member 11a and a cylindrical member 11b provided at an end of the plate-shaped member 11a. The plate-shaped member 11a and the cylindrical member 11b are both formed of, for example, steel and joined to each other by welding.

[0017] The plate-shaped member 11a has a plurality of through holes 11c spaced apart in the longitudinal direction of the cylindrical member 11b on the side opposite to the side on which the cylindrical member 11b is provided. The through holes 11c are formed so that the same bolts as those inserted into the through holes 2c of the liner plate 2 can be inserted therethrough. The plate-shaped member 11a is formed, for example, in a substantially L-shape so that the side on which the cylindrical member 11b is provided is shorter than the side on which the plurality of through holes 11c are provided. This ensures space for the handle 12b of the jack base 12 to rotate, preventing interference between the plate-shaped member 11a and the handle 12b.

[0018] The cylindrical member 11b is configured to extend vertically with the plate-like member 11a fixed to the vertical flange 2b. The threaded pipe 12a of the jack base 12 is inserted into the cylindrical member 11b from below. The bottom surface of the cylindrical member 11b comes into contact with the handle 12b of the jack base 12 when the base 12c is placed on the ground, and is supported from below. Note that when the liner plate assembly 1 is lifted by a rope to move it, the jack base 12 is likely to come off the cylindrical member 11b. Therefore, it is recommended that the jack base 12 be set on the cylindrical member 11b immediately before installing the liner plate assembly 1 at the initial excavation location.

[0019] As shown in FIG. 4 , each retainer 10 is sandwiched between the vertical flanges 2b of a pair of adjacent liner plates 2 and is detachably attached to each of them. Specifically, bolts 13a are inserted into through holes 11c formed in the plate-like member 11a of the retainer 10 and through holes 2c formed in the vertical flanges 2b of each of the pair of liner plates 2, and the bolts 13a are tightened with nuts 13b. This allows the retainer 10 to be attached and detached between the pair of adjacent liner plates 2. Furthermore, because a downward load from the liner plate 2 is applied radially to the bolts 13a, the bolts 13a are prevented from falling out of the through holes 2c, 11c even if an unexpectedly large load is applied to the liner plate assembly 1. The bolts 13a and nuts 13b are an example of connecting hardware that connects the pair of liner plates 2.

[0020] As shown in FIG. 5, an L-shaped member 11d is provided on each of a pair of opposing side surfaces of the plate-shaped member 11a. One portion of the L-shaped member 11d is joined to the side surface of the plate-shaped member 11a, and the other portion extends in a direction perpendicular to the side surface of the plate-shaped member 11a. The other portion of the L-shaped member 11d has an internally threaded hole extending from the side where the tubular member 11b is provided to the side where the through-hole 11c is provided. A bolt 11e is screwed into the internally threaded hole of the L-shaped member 11d. The tip surface of the bolt 11e set in the L-shaped member 11d comes into contact with the surface of the liner plate 2, thereby stabilizing the position of the holder 10 relative to the liner plate 2. The above is the configuration of the holder 10.

[0021] Next, with reference to FIG. 6, the flow of a method for installing the liner plate assembly 1 will be described. First, the liner plates 2 and the retaining fixtures 10 are assembled near the excavation site where a shaft will be excavated in the ground. Specifically, first, the first (lower) annular assembly is assembled as shown in Figure 6(a). In this assembly, multiple liner plates 2 are lined up in the circumferential direction, and bolts 13a are inserted into the through holes 2c of adjacent vertical flanges 2b, and the bolts 13a are tightened with nuts 13b.

[0022] Next, using the same procedure as for the first stage, the second (upper) stage annular assembly is assembled on top of the first stage annular assembly, as shown in Figures 6(b) and 6(c). When connecting the upper and lower liner plates 2 to each other, the upper liner plate 2 is positioned so that their circumferential positions match, and then bolts 13a are inserted into the through holes 2c of the adjacent horizontal flanges 2a and tightened with nuts 13b. When connecting circumferentially adjacent liner plates 2 to each other, the plate-like member 11a of the retainer 10 is sandwiched between a pair of vertical flanges 2b, and the bolts 13a are inserted into the through holes 2c of the pair of vertical flanges 2b and the through holes 11c of the plate-like member 11a and tightened with nuts 13b.

[0023] Next, initial excavation is carried out at the site to be excavated. The inner diameter of the shaft during initial excavation should be large enough to allow the liner plate assembly 1 to be installed, for example, about 10 cm larger than the outer diameter of the liner plate assembly 1. The depth of the shaft should be large enough to allow the holder 10 of the liner plate assembly 1 to be positioned above ground level, for example, about 50 cm to 1 m.

[0024] Next, as shown in Figure 6(d), the assembled liner plate assembly 1 is lifted using rope 3 and placed at the initial excavation site. As a result, the bottom surface of tubular member 11b of holder 10 comes into contact with handle 12b of jack base 12 and is supported from below, so that the load from liner plate 2 is transmitted to the ground via multiple holders 10, and the liner plate assembly 1 can be held in place.

[0025] Before installing the liner plate assembly 1 at the initial excavation site, it is advisable to install a floor plate on the ground at the location where the jack base 12 of each holder 10 will be installed. This allows the base 12c of the jack base 12 to come into surface contact with the floor plate, thereby holding the liner plate assembly 1 more stably.

[0026] Next, the height of each holder 10 installed on the ground is adjusted to adjust the posture of the liner plate assembly 1 to be horizontal. Specifically, the handle 12b of the jack base 12 of each holder 10 is rotated to adjust the height position of the plate-like member 11a relative to the ground. Whether the liner plate assembly 1 is horizontal can be confirmed using a spirit level.

[0027] Next, the gap between the initially excavated shaft and the liner plate assembly 1 is filled with earth and sand, which is then compacted. The above is the flow of the method for installing the liner plate assembly 1.

[0028] After the liner plate assembly 1 has been installed at the initial excavation site, the shaft can be excavated to a depth corresponding to the width of the liner plate 2 inside the liner plate assembly 1, and then the process of assembling one level of liner plate 2 can be repeated to excavate the shaft to the desired depth.

[0029] As described above, the holder 10 according to the embodiment includes a fixing member 11 that is sandwiched between a pair of vertical flanges 2b provided on adjacent liner plates 2 and is detachably attached to the pair of vertical flanges 2b by connecting fittings that connect the pair of vertical flanges 2b, and a jack base 12 that is attached to the fixing member 11 so as to extend downward relative to the fixing member 11 and can be installed on the ground around the shaft. This makes it possible to easily and stably hold the liner plate assembly 1 installed in the shaft. Furthermore, the posture of the liner plate assembly 1 can be adjusted to be horizontal even on sloped or uneven ground.

[0030] The present invention is not limited to the above-described embodiment, and the following modifications are possible.

[0031] (Variation) In the above embodiment, two stages of liner plate assemblies 1 are installed in the shaft during initial excavation, but the present invention is not limited to this. For example, one stage or three or more stages of liner plate assemblies 1 may be installed.

[0032] In the above embodiment, the liner plate 2 is arc-shaped and the liner plate assembly 1 is annular, but the present invention is not limited to this. The liner plate 2 may be, for example, linear, J-shaped, or L-shaped. Furthermore, by combining liner plates 2 of different shapes, for example, the annular liner plate assembly 1 may be configured to have a rectangular cross section.

[0033] In the above embodiment, bolts 13a and nuts 13b are used as connecting fittings for connecting adjacent liner plates 2 and retainers 10, but the present invention is not limited to this. For example, clips or lock pins that can be inserted into through holes 2c and 11c may be used as connecting fittings.

[0034] In the above embodiment, the holder 10 is attached to the liner plate 2 in the uppermost row, but the present invention is not limited to this. The holder 10 may be attached to any row of liner plate 2 as long as the liner plate 2 is installed in a shaft and is on the ground. For example, the holder 10 may be attached to the liner plate 2 in the second row from the top.

[0035] In the above embodiment, all of the retainers 10 are attached to the liner plates 2 in the same tier, but the present invention is not limited to this. Retainers 10 may be attached to liner plates 2 in different tiers. For example, if there is a difference in elevation on the ground, retainers 10 installed on the lower side of the ground may be attached to the liner plates 2 in the lower tier, and retainers 10 installed on the higher side of the ground may be attached to the liner plates 2 in the upper tier.

[0036] In the above embodiment, the jack base 12 is used as the leg member supporting the fixed member 11, but the present invention is not limited to this. For example, a hydraulic cylinder may be used as the leg member instead of the jack base 12. Furthermore, the leg member is not limited to one whose longitudinal length extending from the cylindrical member 11b of the fixed member 11 is adjustable, and may be one whose longitudinal length is not adjustable, for example, one in which a single pipe is connected to the fixed base.

[0037] In the above embodiment, the liner plate assembly 1 is assembled, then the initial excavation of the shaft is carried out, and the assembled liner plate assembly 1 is installed at the initial excavation location, but the present invention is not limited to this. For example, the liner plate assembly 1 may be assembled after the initial excavation of the shaft is carried out, and the assembled liner plate assembly 1 may be installed at the initial excavation location. Also, the liner plate assembly 1 may be assembled at the initial excavation location after the initial excavation of the shaft is carried out.

[0038] The above-described embodiments are merely examples, and the present invention is not limited to these. Various embodiments are possible within the scope of the invention as set forth in the claims. The components described in the embodiments and modifications can be freely combined. Furthermore, inventions equivalent to the inventions set forth in the claims are also included in the present invention. [Explanation of symbols]

[0039] 1 Liner plate assembly 2 liner plates 10 Holder 11 Fixing member 11a Plate-shaped member 11b Cylindrical member 12 Jack base

Claims

1. a fixing member sandwiched between a pair of vertical flanges provided on adjacent liner plates, and detachably attached to the pair of vertical flanges by connecting fittings that connect the pair of vertical flanges; A leg member provided on the fixed member so as to extend downward relative to the fixed member and capable of being placed on the ground around the shaft; A holder comprising:

2. The leg member is configured so that the length in the longitudinal direction extending from the fixed member can be adjusted when installed on the ground around the shaft. The holder of claim 1 .

3. The leg member is provided at an end of the fixing member opposite to an end fixed to the vertical flange. The holder of claim 1 .

4. The fixing member includes a plate-like member sandwiched between the vertical flanges of adjacent liner plates, The plate-like member has a plurality of through holes formed at positions corresponding to the through holes formed in the vertical flange of the liner plate, and through which the connecting fittings can be inserted. The holder of claim 1 .

5. the fixing member includes a tubular member extending in the up-down direction while being fixed to the vertical flange, The leg member is a jack base including an axial member inserted into the tubular member, and a handle that can be rotated relative to the axial member to adjust its position in the longitudinal direction of the axial member and that comes into contact with a bottom surface of the tubular member. The holder of claim 1 .

6. a plurality of liner plates assembled in an annular shape; a plurality of holders according to any one of claims 1 to 5, which are detachably attached so as to be sandwiched between adjacent liner plates; A liner plate assembly comprising:

7. assembling the liner plate assembly of claim 6; a step of placing a portion of the liner plate assembly assembled in the step inside the shaft and installing each holder on the ground around the shaft; A method of installing a liner plate assembly comprising:

Images