JP3136436U - Soft ground displacement follow-up type elastic joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: Because it is lightweight and compact, can be assembled in a factory, has excellent workability, and can be manually constructed while visually checking, so it can be reliably and safely constructed, and it has excellent workability, safety and economy. To develop and provide soft ground displacement follow-up type elastic joints.
[MEANS FOR SOLVING PROBLEMS] A plurality of locking member portions are embedded in inner peripheral groove portions of end faces of respective box cases which are composed of a stopper bracket, a preset joint, and a joint material for preventing invasion of earth and sand and which are connected to each other at the time of installation. In addition, a stopper bracket is fixed to each of the locking member portions, and a preset is set between a plurality of opposing stopper brackets and the stopper bracket in advance based on survey data such as environmental conditions and ground displacement. Displacement tracking of soft ground by welding joints and sandwiching joint material for prevention of earth and sand intrusion around the outer periphery of the gap between the box box and connecting multiple box boxes And water stop measures.
[Selection] Figure 6

Description

  The present invention relates to a soft ground displacement follow-up type elastic joint for allowing a buried underground box box to be constructed on soft ground to follow ground subsidence as a flexible structure.

  There are two types of conventional joint methods: rigid joints that employ color joints and flexible joints that employ flexible joints, but most constructions that require flexible joints employ flexible joints. The current situation is that The reason for this is that in the case of a color joint, the construction cost per place is low and the workability is excellent, but the deformation capacity of the joint (opening, misalignment, bending angle) is smaller than that of the flexible joint, Moreover, since the opening cannot be restrained, the joint material and the water stop plate may be broken, and a mistake is unacceptable.

  In the case of flexible joints, the construction cost per place is expensive, the deformation capacity of the joints (opening, misalignment, bending angle) is larger than that of color joints, and the results of flexible structure joints are the most. In terms of nature, it is guaranteed against water pressure, but not against earth pressure.

  In addition, development of elastic joints is currently desired to solve these problems, but when the elastic joint method is adopted for the precast box, the joints are integrated by vertical tightening (tension force) between the block boxes. There is a problem that the flexibility of the box cannot be expected. Moreover, as a trial construction by the Ministry of Land, Infrastructure, Transport and Tourism, an elastic joint method has been experimentally adopted for a precast box, but it has not been put into practical use. As a cause of this, when the precast box is tensioned all at once (all span tension), the tension force is not sufficiently transmitted to the box near the center of the span due to the bottom frictional force. The rubber material sandwiched between them is not sufficiently compressed, leaving a problem in water tightness. Moreover, the present situation is that the practical use of the elastic joint in a cast-in-place body is not conspicuous.

For reference, the patent documents of box joints filed so far will be introduced. (See Patent Documents 1 to 3.)
JP-A-8-253926 JP-A-8-253927 JP-A-8-253928

  So, in order to solve the above problems, this device is lightweight and compact and can be assembled in the factory, so it is excellent in workability, and can be constructed manually while visually checking, so it can be reliably and safely constructed. In addition, it is to develop and provide a soft ground displacement follow-up type elastic joint that is excellent in workability, safety and economy.

  As a means for solving this problem, the water stop elastic joint is screwed into a plurality of locations in the inner peripheral groove between the box box and a plurality of locking members such as anchor bolts, nuts and washers. A stopper bracket, two steel frames formed in the shape of a square flange, and a buffer / water stop joint between the steel frames in a polymerized combination, and both the left and right sides of the steel frame Preset joints provided with cylindrical elastic members on the outer surface and sewn at multiple locations with locking members such as bolts, nuts, and washers, and the gap between the box box and box box It consists of joint material to prevent invasion of earth and sand that is sandwiched between the outer peripheral parts, and in the installation work, engagement of multiple anchor bolts, nuts, washers, etc. in the inner peripheral groove part of each box box end face that is connected to each other. Stop part The stopper brackets are buried and fixed to the locking members, and the environmental conditions and ground displacement are investigated in advance between the opposing stopper brackets and the stopper brackets, and tightened based on the analysis data. Welding preset joints with conditions of applied force, and attaching joint material for prevention of earth and sand intrusion to the outer periphery of the gap between the box box and connecting multiple box boxes Therefore, it is provided to enable displacement tracking and water stoppage measures for soft ground.

  In addition, the non-water-stop elastic joint includes a stopper bracket provided by screwing a plurality of locking members such as anchor bolts, nuts and washers at a plurality of locations in the inner peripheral groove between the box case and the box case.・ Cylinder-shaped elastic members are sandwiched between the opposing stopper brackets and between the stopper brackets, and on the left and right sides, and are sewn at multiple locations with locking members such as bolts, nuts, and washers. In addition, a water stop plate provided by being sandwiched around the back surface of a plurality of stopper brackets that are screwed to face each other, and for prevention of earth and sand intrusion provided by being sandwiched between outer peripheral portions of a gap between the box case and the box case A plurality of anchoring members such as anchor bolts, nuts, washers, etc. are embedded in the inner peripheral groove of each box box end face that consists of joint material and is connected to each other during installation. In addition, a water stop plate and a stopper bracket are respectively superposed and fixed to the locking member portion, and cylindrical elastic members are sandwiched between left and right side surfaces between a plurality of opposing stopper brackets and the stopper bracket. It is attached to the outer periphery of the gap between the box box and a joint material for preventing invasion of earth and sand. In addition, by providing a plurality of box boxes connected to each other, displacement follow-up of soft ground and measures against water stoppage are made possible.

  As an effect of this device, when a soft ground displacement follow-up type elastic joint is adopted for the winding collar, the opening can be limited to an allowable range, and the joint material and the water stop plate can be prevented from being broken. Furthermore, when used in combination with existing pressure-resistant rubber collar joints, the deformation capability equivalent to flexible joints can be secured, and when used in flexible joints, excessive joint deformation (opening, misalignment, bending angle) is within the allowable range. It is possible to limit the water supply function and contribute to securing the water flow function. Furthermore, if it is used in a cast-in-place box, it is possible to construct an elastic joint of the cast-in-place box, and if it is used in a precast box, a vertical tightening process is not required, so a shortening of the construction period and economic effects can be expected. It has very beneficial effects such as workability, safety and maintenance.

  As the best mode of this device, the setting force of the preset joint is calculated by calculating the optimal preset load value based on the survey data such as environmental conditions and ground displacement, and selecting the optimal elastic member material. At the same time, it is important to reduce costs and improve quality by sharing parts and reducing weight.

  Therefore, when one embodiment of the present invention is described in detail with reference to FIGS. 1 to 6, it is widely used in flexible structure lock box boxes, road crossing box pipes, structures having elastic joints, and the like, and A water-stopping elastic joint for connecting a plurality of underground boxes of a predetermined length (L) buried on soft ground in the horizontal direction, the elastic joints being a box box (BO) and a box box Stopper bracket (1) provided by screwing with a plurality of locking members such as a plurality of anchor bolts (AB), nuts (N), and washers (W) at a plurality of locations in the inner peripheral groove (BOa) between (BO) And a steel buffer (2) formed in the shape of a square flange and a steel frame (2) provided with a single buffer / water stop joint (3) in a polymerized combination, and the steel frame Cylindrical elastic members (4) and (4) are respectively sandwiched between the left and right outer surfaces of One between the box joint (BO) and the box box (BO), and the preset joints that are sewn at multiple locations with locking members such as bolts (B), nuts (N), and washers (W). In the inner peripheral groove (BOa) of each box box (BO) end face, which is composed of a joint material (6) for preventing invasion of earth and sand provided by being sandwiched between the outer peripheral parts of A plurality of anchoring member portions such as a plurality of anchor bolts (AB), nuts (N), and washers (W) are embedded, and a stopper bracket (1) is fixed to each of the retaining member portions, and a plurality of opposing members are opposed to each other. Between the stopper bracket (1) and the stopper bracket (1), inspecting environmental conditions and ground displacement in advance, and welding the preset joints with the tightening force set on the basis of the analysis data. Box Displacement of soft ground by sandwiching a joint material (6) for preventing invasion of earth and sand at the outer periphery of the gap between (BO) and box box (BO) and connecting a plurality of box boxes (BO). It consists of a soft ground displacement follow-up type elastic joint, which is characterized by being able to follow and stop water.

  First, a constraint condition and a structural advantage when a plurality of box boxes (BO) are connected to a soft ground will be described. FIG. 1 (A) shows a normal unloaded state, and FIG. ) Shows a state in which the box body (BO) is bent into a curved state due to its own weight and load, and FIG. 1 (C) shows an enlarged detailed view of the connecting portion. And in the case of a flexible joint, when the opening (X) part, the difference (Y) and the bending angle (Z) are not constrained, there is an advantage that the deformability of the joint is large and the cross-sectional force between the boxes is not transmitted. However, if the amount of deformation increases, it will hinder the water flow function. In addition, problems such as breakage of the joint occur. Therefore, in order to solve these problems, the soft ground displacement follow-up type elastic joint of the present invention has been devised, which will be described in detail below.

  First, there are two types of box boxes: precast box box and cast-in-box box. The outline of the procedure for attaching the elastic joint in the case of the former precast box box will be explained. It is transported from the factory to the site, and a hole for embedding the anchor bolt is drilled in the site, and the anchor bolt is embedded in the hole. Stopper bracket (1) end face where the first box box is installed and joints formed in a three-layered square flange shape preset in the factory in advance are screwed and fixed to a plurality of locations on the inner periphery of the end face of the box box It is welded and fixed to the part. Next, install the second box box on the opposite side, embed a plurality of anchor bolts and screw the stopper bracket (1) in the same procedure as above, and weld the preset joints to form the plurality of box boxes. Continuing. In the case of the above-mentioned cast-in-place box, an anchor bolt can be embedded without drilling because the box box is built on site. In addition, it can be installed in a small place because the box is not required to be transported. In addition, the work process is long, but the cost is low. Therefore, if the soft ground displacement follow-up type elastic joint of the present invention is adopted for a cast-in-place box in a narrow space, it is possible to construct a cast-in-place elastic joint. The tightening process becomes unnecessary, and the construction period can be shortened and the economic effect can be expected.

  Next, the structure, characteristics, and performance of the elastic joint will be described. First, as shown in FIG. 3, the structure is a joint for buffer and water stoppage at the joint of the box box (BO) and the box box (BO) ( 3) With a structure that sandwiches (elastic rubber) and has flexibility in the direction of the axis, it has a joint structure in which the box displacement can follow the ground displacement (residual settlement and lateral displacement) It has the function of (watertightness).

Therefore, the performance required for the elastic joint is water tightness and followability to ground subsidence. When a compressive force is applied in the direction of the axis, the elastic member (4) expands and the joint for buffer and water stop ( In 3), compression distortion occurs. On the other hand, when a tensile force is applied in the direction of the axis, the elastic member (4) is compressed and the buffer / water-stop joint (3) expands. Further, the extension of the elastic joint has a structure that does not exceed the tightening length because the opening can be limited to an allowable range. In addition, in the definition of deformation performance (elongation, misalignment) of the elastic joint, in order to ensure water tightness, the minimum value of the contact stress at the joint with respect to the elongation should be 0.5 N / mm ² or more. The maximum value of the contact stress at the part is set to 7.0 N / mm ² or less. In addition, the difference is determined so that the shear strain is 100% or less with the rubber thickness at the time of compression.

  Next, the joint bolt (B), nut (N), washer (W) and elastic member (3) (4) will be explained. The environmental conditions and the ground displacement amount for constructing the box box are investigated, and the analysis data Preset the tightening force at the factory based on Therefore, since the tightening force varies depending on the mounting location, it is necessary to use locking members such as bolts (B), nuts (N), and washers (W) that are optimal for the degree of tension. The elastic members (3) and (4) are made of chloroprene rubber (CR rubber) having a hardness of 30 to 60 and a breaking strain of 700 to 400%, all of which have optimum specifications based on analysis data. It is attached.

  Next, the stopper bracket (1) will be described. The material is made of steel, and as shown in FIG. 6 (B), it has a role of transmitting the reaction force acting on the joint to the adjacent box and is combined with the joint material. This is to limit the joint opening, misalignment, and bending angle within the allowable range.

  The other embodiments will be described in detail with reference to FIGS. 7 to 11. In a non-water-stop elastic joint that connects a plurality of box bodies of a predetermined length (L) in the horizontal direction, the elastic joint is a box box. (BO) and a box box (BO) between the inner peripheral groove (BOa) between a plurality of locations with a plurality of anchoring members such as anchor bolts (AB), nuts (N), washers (W), etc. Cylindrical elastic members (14), (15), and (14) are sandwiched between the provided stopper bracket (11), the stopper brackets (11) at a plurality of opposing positions, and between the stopper brackets (11) and the left and right side surfaces, respectively. In addition, a plurality of locking members such as bolts (B), nuts (N), and washers (W) are provided to be screwed to a plurality of locations, and are sandwiched around the back surface of a plurality of stopper brackets that are screwed to face each other. Wear and set A waterproofing plate (12) and a joint material (6) for preventing invasion of earth and sand provided between the box box (BO) and the outer peripheral part of the gap between the box box (BO). At times, a plurality of locking members such as anchor bolts (AB), nuts (N), and washers (W) are embedded in the inner peripheral groove (BOa) of each box box (BO) end face to be connected to each other. In addition, the water stop plate (12) and the stopper bracket (11) are superposed and fixed to the engaging member portion, and the left and right sides are disposed between the plurality of opposing stopper brackets (1) and the stopper bracket (1). Cylindrical elastic members (14), (15), and (14) are sandwiched between both side surfaces, and sewn at a plurality of locations with locking members such as bolts (B), nuts (N), and washers (W). A box box (B ) And the box body (BO) between the outer periphery of the gap (6), and a plurality of box bodies (BO) are connected to each other so that the displacement of soft ground can be tracked. It consists of a soft ground displacement follow-up type elastic joint, which is characterized by being provided with measures against water stoppage.

  And in contrast to the above water-stop elastic joint, this non-water-stop elastic joint does not have a water-stop function as shown in FIGS. 7 and 8, so that the space between the box box (BO) and the box box (BO) The stopper bracket (11) is overlapped and screwed to the inner periphery of the joint, and the joint material (6) for preventing soil and sand intrusion is sandwiched between the box box (BO) and the box box (BO). It is what I wore.

  The non-water-stop elastic joint is lightweight and easy to transport, so there is no need for large equipment such as cranes, and it is excellent in workability, safety and economy.

  Accordingly, the proper use of the water-stopping elastic joint and the non-water-stopping elastic joint is determined by comprehensively judging the environmental conditions to be used, the budget, the construction period, and the like.

  The soft ground displacement follow-up type elastic joint of this device is lightweight and small and can be assembled in the factory, so it is excellent in workability, and can be constructed manually while visually checking, so it can be constructed reliably and safely, and Because of its excellent workability, safety and economy, it has industrial applicability in terms of contributing to many civil engineering and construction related markets.

An embodiment of the present invention is shown, wherein (A) is a front view of an articulated block box (elastic joint for water stop) in a no-load state (before the occurrence of bending), and (B) is in a loaded state (the occurrence of bending). (C) is an enlarged detail view of the connected block box of FIG. FIG. 2 shows an embodiment of the present invention, and is an enlarged detail view (part a waterproof joint) of FIG. FIG. 3 shows an embodiment of the present invention, and is an enlarged detail view of a portion b in FIG. 2 (elastic joint for water stop). One Example of this invention is shown, (A) is the c section enlarged detail drawing (elastic joint for water stop) of FIG. 2, (B) is a dd arrow sectional view of FIG. One Example of this invention is shown, (A) is sectional drawing of a block box (elastic joint for water stop), (B) is sectional drawing seen from the ee arrow of FIG. One Example of this invention is shown, (A) is a perspective view which shows the attachment detail of the elastic joint for water stop, (B) is an expansion detailed perspective view of the stopper bracket attachment part of FIG. 1 shows an embodiment of the present invention and is an enlarged detail view of a part (non-water-stop elastic joint) in FIG. 1. FIG. 8 shows an embodiment of the present invention, and is an enlarged detail view of part a in FIG. 7 (non-water-stop elastic joint). An embodiment of the present invention is shown, (A) is an enlarged detailed view of part b (non-water-stop elastic joint) in FIG. 7, (B) is a cross-sectional view taken along the line cc in FIG. FIG. 10 is a cross-sectional view taken along line dd in FIG. 9. One Example of this invention is shown, (A) is sectional drawing of a block box (elastic joint for non-waterproofing), (B) is sectional drawing seen from the ee arrow of FIG. One Example of this invention is shown, (A) is a perspective view which shows the attachment detail of the non-water-stop elastic joint, (B) is an expansion detailed perspective view of the stopper bracket attachment part of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stopper bracket 2 Steel frame 3 Joint for buffer and water stop 4 Elastic member 5 Protection plate 6 Joint material for preventing earth and sand intrusion 11 Stopper bracket 12 Water stop plate 14 Elastic member 15 Elastic member AB Anchor bolt B Bolt BO Box box BOa Groove L Predetermined length (block box)
N Nut S Set screw T Clearance W Washer X Opening Y Mistake Z Folding angle

Claims (2)

  Widely used in flexible structure Xiamen box boxes, road crossing box pipes, structures with elastic joints, etc., and a plurality of underground boxes of a predetermined length (L) embedded on soft ground In the water-stopping elastic joint that connects the boxes in the horizontal direction, the elastic joint has a plurality of anchor bolts (AB) at a plurality of locations in the inner peripheral groove (BOa) between the box box (BO) and the box box (BO). ), Nut (N), washer (W), etc., each of which is provided with a stopper bracket (1) that is screwed together, and two steel frames (2) and a steel frame formed in a square flange shape (2) A single buffer / water stop joint (3) is provided between the two, and a cylindrical elastic member (4) (4) is sandwiched between the left and right outer surfaces of the steel frame. And locking parts such as bolt (B), nut (N), washer (W) From the preset joints sewn and provided at a plurality of locations, and the earth and sand invasion prevention joint material (6) provided by being sandwiched around the outer periphery of the gap between the box box (BO) and the box box (BO). In addition, at the time of installation, a plurality of anchor bolts (AB), nuts (N), washers (W), etc. are locked in the inner peripheral groove (BOa) of each box box (BO) end face to be opposed to each other. The member part is embedded, and the stopper bracket (1) is fixed to the engaging member part, and the environmental conditions and ground displacement are previously determined between the opposing stopper brackets (1) and the stopper bracket (1). Investigate the amount, etc., weld preset joints whose conditions of tightening force are set based on the analysis data, and prevent intrusion of sand and sand between the outer periphery of the gap between the box box (BO) and the box box (BO) Soft ground displacement follow-up, characterized by providing displacement follow-up and water stoppage measures for soft ground by sandwiching joint material (6) and connecting multiple box boxes (BO). Type elastic joint. In the non-water-stop elastic joint that connects a plurality of box bodies of a predetermined length (L) in the horizontal direction, the elastic joint includes an inner circumferential groove (BOa) between the box box (BO) and the box box (BO). ) And a plurality of stopper brackets (11) which are provided by being screwed to a plurality of locations with locking members such as a plurality of anchor bolts (AB), nuts (N), and washers (W), respectively. 11) A cylindrical elastic member (14) (15) (14) is sandwiched between the stopper bracket (11) and the left and right side surfaces, and a bolt (B), nut (N), washer (W) A water stop plate (12) provided by being sewn around a plurality of stopper brackets, which are provided by being sewn at a plurality of positions by a locking member such as, and a box box (BO ) And Bock Inner perimeter of each box box (BO) end face that consists of joint material (6) for preventing invasion of earth and sand provided on the outer periphery of the gap between boxes (BO) and that is connected to each other during installation. A locking member such as a plurality of anchor bolts (AB), nuts (N), and washers (W) is embedded in the groove (BOa), and a water stop plate (12) and a stopper bracket are embedded in the locking member. Cylindrical elastic members (14), (15) and (14) on both the left and right side surfaces between the plurality of stopper brackets (11) and the stopper brackets (11) facing each other. Are attached to each other, and are sewn to a plurality of locations with locking members such as bolts (B), nuts (N), and washers (W), and a box box (BO) and a box box (BO) earth and sand around the outer periphery of the gap Softness characterized by providing displacement tracking and water-stopping measures for soft ground by sandwiching joint material (6) for preventing entry and connecting multiple box boxes (BO). Ground displacement follow-up type elastic joint.

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