JPH0421414B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention is directed to constructing a tunnel for accommodating cables such as electric wires, telephone lines, traffic signals, and wired broadcasting lines buried underground in urban areas. Concerning improvements in frames and their construction methods.

(Prior Art) Conventionally, as construction members for this type of cab system, a cover type with a square cross section, a cylindrical box type, a conduit type with a concrete cast type, etc. have been used. However, the lid-hanging type and box-type ones are mainly made of concrete with reinforcing bars in the factory, and the cross-section is
Shape: Cylindrical height approx. 1.5m to 2.0m, width approx. 1.2m to 2.0m
A long (approximately 1 m to 3 m) and heavy one-piece construction member is manufactured by molding, and this bulky and heavy construction member is transported to the site and sequentially buried in series to construct a mine shaft, and the side wall of this member is A shelf is provided inside to support and lay the cable.

As described above, the tunnel frame for the cab system has extremely low burying efficiency and high cost due to the complicated molding work and the transportation of bulky and heavy construction members. Therefore, the applicant of the present application
We have developed Patent Application No. 136448 of 1961 (hereinafter referred to as the "prior invention") to overcome the shortcomings of conventional shaft frames.

(Problems to be solved by the invention) In the prior invention, the idea is that the side wall body supporting the side wall earth and sand of the trench to secure the tunnel is composed of a single piece, so it is difficult to solve the problem during the forming process and at the site. Complications remain in the construction process and handling such as transportation, which still reduces construction efficiency, and the load due to earth and sand after burial increases as it gets closer to the bottom along the length of the side wall. Therefore, it is necessary to bend the reinforcing bars to the inside or outside of the side wall in order toward the bottom, and to increase the wall thickness continuously. The purpose of the present invention is to solve these problems because molding is complicated by sequentially changing the size of the constituent structure.

(Means for Solving the Problems) In order to achieve the above object, the present invention has a pair of side walls mainly made of concrete. a plurality of vertical bone bodies that are divided into three or more parts, and the divided side wall bodies are supported and connected to each other on the left and right side;
We have proposed a tunnel frame for cab systems that is characterized by a combination of beams for extending between the longitudinal frames at multiple locations facing each other, and as a construction method, we have constructed side walls mainly made of concrete. The side walls are divided vertically into three or more parts: an upper edge wall, a middle wall, and a lower base wall. Side walls are placed facing each other by joining the vertical ribs that are stacked up against each other at multiple locations inside each other, and a beam body is placed between these opposing vertical ribs and stretched. By joining, forming and handling of the side wall body is simplified,
This improves the efficiency of construction work on site.

(Function) By further dividing the left and right side walls separated and facing each other into a plurality of three or more upper and lower parts along the length direction, the side walls can be made even lower in bulk and have a uniform configuration. The molding process is greatly simplified, and the distance between the left and right opposing side walls can be widened or narrowed, and the height of some of the walls, especially the inner wall for height adjustment in a simple structure, can be adjusted or divided. Adjust the height (depth) of the side wall by adding or subtracting the number,
The height and width of the trench formed by the shaft frame can be changed arbitrarily, and the walls of each part are stacked on top of each other, and multiple parts are joined together with vertical frames to form opposing side walls. By stretching and connecting the beam bodies between the opposing vertical frames, the opposing side walls are firmly fixed to form a shaft frame.

In the tunnel frame construction method, the side wall body is constructed by dividing it into three or more long pieces of low bulk, upper and lower.
The vertical dimension of each wall section is divided into short sections to receive the load caused by vertical soil pressure during burial, so each wall section is formed separately to accommodate the difference in vertical soil load. During construction, the split side walls are stacked one after another on both the left and right sides of the trench dug on site, and the vertical frames are joined together at multiple locations, with the side walls facing left and right. In addition, by connecting the beams by extending them between the vertical frames of the opposing side walls, the earth and sand load of the slot can be absorbed by the tensile force of the beams at each of the opposing walls. It is firmly fixed by supporting it from left to right in the length direction,
It is possible to construct a solid shaft frame.

(Example) Next, an example of a shaft frame for a cab system and a method of constructing the same according to the present invention will be described with reference to the drawings.

1 to 3 are perspective views sequentially showing each part of a tunnel frame for a cab system in which the present invention can be implemented;
The figure is a perspective view of a side wall body formed by combining the above parts, Figure 5 is a sectional view taken along the line Z-Z in Figure 4, and Figure 6 is a vertical cross-section of a shaft frame constructed by implementing the method of this invention. In the figure, 1 is a side wall body, which consists of opposing plate-shaped bodies with a rectangular shape mainly made of concrete with internal reinforcing bars (not shown).
It is formed by dividing it into upper and lower three parts along the length direction: an upper edge wall part 1a, a middle wall part 1b for height adjustment, and a lower stand wall part 1c, and the stacked joint surfaces of the upper edge wall part 1a, the middle wall part 1b for height adjustment, and the lower stand wall part 1c are formed along the length direction. A meshing section 3 is provided, and each wall section 1a, 1
Mounting screw holes 4, 4 arranged vertically in parallel are provided at various locations on the inner surfaces of b, 1c. 2 is an elbow side provided by horizontally bending and extending the lower end of the lower table wall 1c inward, and reinforcing bars 7, 7 for connecting the floor are horizontally projected from the inner end, and the left and right sides of the base of the elbow side 2 are extended horizontally. Support holes 6, 6 for erecting the longitudinal frame 8 in the vertical direction are provided at the locations. It is also possible to omit this elbow side 2 and form each wall portion 1a, 1b, 1c into a series of plate shapes, and provide reinforcing bars to protrude horizontally from the inner side of the lower side of the lower base wall portion (not shown). Reference numeral 4 indicates mating pieces provided alternately facing inward and outward at both front and rear end sides along the length direction of each wall portion 1a, 1b, 1c.

The vertical bone body 8 is made of two (plural) metal materials with a cross section of 〓 shape.
are formed as a set, and mounting holes 9, 9 are formed in the back side 8a in the front-back direction, and coupling holes 10, 10 are formed in the left and right sides 8b, respectively, passing through in the left-right direction.

Reference numeral 11 is a beam body, which is made of metal and is attached to the left and right sides 8 of the vertical frame body 8.
It is formed to have a square cross section that can be inserted between the left and right sides 11a, 11a, and has connecting holes 12, 12 formed therethrough.

Also, to explain how to construct it, the 6th
Groove hole 1 formed by digging the ground as shown in the figure
Foundation crushed stone 16 is laid on the bottom of 5, and mortar or concrete 17 is applied to the top to harden it.
The lower stand walls 1c, 1c are placed on both left and right sides of this floor, facing each other in parallel with a space between them with the elbow sides 2, 2 inside, and reinforcing bars 18, 18 are placed between the elbow sides 2, 2 to form concrete 19. Drive and install, insert the lower ends of the vertical frames 8, 8 into the support holes 6, 6 of the lower base wall parts 1c, 1c so that they stand upright facing each other, and screw them into the mounting holes 9, 9 with bolts 13, 13. and install it.
On these lower stand wall parts 1c, 1c, middle wall parts 1b, 1 are sequentially placed.
b, The upper edge wall parts 1a, 1a are connected by fitting the step parts 3, 3 into each other, and the vertical ribs 8, 8 are connected to the mounting holes 9, 9 with bolts 13, 13, respectively. The side walls 1, 1 are erected to face each other on both the left and right sides of the slot 15, and the beam bodies 11, 11 are installed at a plurality of upper and lower locations between the vertical ribs 8, 8 of the opposing left and right side walls 1, 1.
and bolts 14, 1 through the connecting holes 10, 12.
4 to construct a shaft frame, and this construction frame is joined in the length direction in the slot 15, and the mating pieces 4, 4 are sequentially joined to form a shaft, and the upper edge wall portions 1a, A road is formed by sequentially fitting the cover bodies 20 onto 1a.

The attachment mechanism to the vertical frame body 8 that connects each wall portion 1a, 1b, 1c is not only the screw mechanism using the above-mentioned attachment screw portion 5, attachment hole 9, and bolt 13, but also by fitting,
It is attached by any mechanism such as hanging, and each wall 1
By interposing a waterproof elastic band (not shown) at each joint between the step portions 3, 3 and mating pieces 4, 4 of a, 1b, and 1c, water intrusion into the tunnel is prevented, and the beam body 11 to support the cables accommodated in the tunnel in a layered manner, and it is also possible to support the cables by attaching an arm rod (not shown) to the mounting screw part 5 of the vacant side wall body 1. It is.

In addition, the mounting screw holes 4, 4 are provided so as to vertically arrange and connect the vertical ribs 8, 8 at two locations approximately 20.7% from both the front and rear ends of the side wall 1, which connects and forms the respective wall portions 1a, 1b, 1c. Regarding the parallel shaft frames and their construction method, the vertical frames 8, 8 of the left and right side walls 1, 1, which are connected and supported at two points in front and back, facing each other, are stretched by beams 11, 11. By stretching and connecting, the earth and sand load applied to the side wall body can be supported with the best efficiency, so the strength structure of each wall portion 1a, 1b, 1c of the side wall body 1 is changed from front to back (lengthwise direction). Even if they are made the same, they can sufficiently withstand the load, and the process of manufacturing and constructing each wall portion 1a, 1b, 1c is simplified, which has the effect of improving construction efficiency. The joining position of the longitudinal bones 8, 8 (approximately 20.7% from both end sides) is R _A = w(a+l) ² −wb ² /2l, R _B = w(b+l) ² −wa ² /2l Q _A = R _A −wa M _A = −wa ² /2, M _B = −wb ² / _{2 M} ^_

R _A =w(a+l) ² −wa ² /2l=2al+l ² /2l=a+l/
2 M _A = _-wa ² /2 = ^{-a 2} _/ 2 (w = 1) M ^{2 When} _Q ^{_ _} _{_} Then, −a ² /2=l ² /8−a ² /2, so a ² /2+a ² /2=l ² /8 a ² =l ² /8 ∴a=0.353l l=1/1+0.353×2=0.586 a=0.586×0.353=0.207 This is based on , and since _{M A} , _M

(Effects of the Invention) The tunnel frame for a cab system of the present invention has a dividing wall portion which divides the side wall body into three or more upper and lower parts along the length direction as described above, and a side wall by connecting the dividing wall portions. It is characterized by a structure consisting of a plurality of longitudinal ribs forming the body and beams for fixing the connected side walls facing left and right at intervals, and a method of constructing the same. Since the shaft frame is formed by extending and connecting the beams between the vertical frames facing left and right and fixing the opposing side walls, the load of earth and sand applied to the side walls when the shaft frame is buried is reduced. In order to correspond to the fact that the concrete becomes larger as it gets closer to the bottom, the reinforcing bars are placed in a series of bends inwards and outwards as in the past, and the thickness of the concrete is gradually and continuously adjusted. Since each wall is divided and formed individually, the bending force across the top and bottom of each wall with shortened top and bottom lengths is strong, and reinforcement is only placed along the length. There is an advantage that it can be handled by Therefore, the manufacturing process of each wall part of the side wall body is simplified, and the handling of the shaft frame during assembly, transportation, storage, etc. on site is extremely simple, which improves the construction efficiency of this type of shaft frame, and also improves the efficiency of construction of this type of shaft frame. To increase or decrease the vertical dimensions and number of the vertically divided structure of the side wall body in the shaft frame for the Yabu system, especially the vertical dimension and number of the inner wall part of the simple structure,
In addition, due to the structure that separates the left and right opposing side walls from each other, the depth and width of the tunnel (between the opposing side walls) can be adjusted depending on the condition of the existing facilities at the site.
Because it is possible to easily and reliably adjust the size of the pipes to any size, when constructing this type of tunnel in cities where there are many buried underground structures such as gas pipes, water pipes, and sewage pipes, it is possible to easily and reliably adjust these underground structures vertically and horizontally. This has the advantage of being extremely convenient as it is easy to lay a tunnel while avoiding it.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a side wall of a shaft frame for a cab system in which the present invention can be implemented, Fig. 2 is a perspective view of a vertical frame of the shaft frame, and Fig. 3 is a perspective view of a beam of the shaft frame. , FIG. 4 is a perspective view of the side wall body connected and formed by the vertical frame body, FIG. 5 is a sectional view taken along the Z-Z line of the same, and FIG. be. In the figure, 1 is a side wall body, 1a is an upper edge wall part, 1b is a middle wall part, 1c is a lower base wall part, 8 is a vertical frame body, 11 is a beam body, and 15 is a slot.

Claims (1)

[Claims] 1. An upper edge wall portion, a middle wall portion,
A pair of left and right opposing side walls divided into three or more parts of the lower table wall, a plurality of vertical ribs for connecting to the opposing side walls, and a vertical rib for directing the opposing side walls. A shaft frame for a cab system consisting of a beam body stretched between. 2. The tunnel frame for a cab system according to claim 1, wherein the vertical ribs are two in number and are connected at two locations approximately 20.7% from both the front and rear end sides of each dividing wall. 3. On both the left and right sides of the trench formed by excavating the ground, the top edge wall, middle wall,
Each wall of the side wall divided into three or more parts of the lower base wall is successively stacked and installed on the left and right facing each other, and the vertical ribs are placed and connected at several places on the inside, and the side walls are installed opposite each other. , A method for constructing a shaft frame for a cab system in which a beam body is arranged between a plurality of opposing longitudinal frames and connected by stretching. 4 Approximately 20.7 mm from both front and rear ends of the side wall body
The method for constructing a shaft frame for a cab system according to claim 3, wherein the vertical frame bodies are joined at two locations at 100%.