Girder-falling prevention device

The invention provides a method and device for calculating track irregularity at a bridge pier settlement and an electronic apparatus, which relate to the technical field of high-speed railways. The method comprises the following steps: obtaining the vertical deformation of a bridge at the settlement of a bridge pier; inputting the vertical deformation into the mapping analytical model of bridge vertical deformation and track deformation, and calculating the track deformation caused by pier settlement. The mapping analytical model is a model reflecting the corresponding relationship between vertical deformation and track deformation of the bridge. The track irregularity power spectral density function is determined and the track irregularity graph is generated by fitting the track irregularity power spectral density function with numerical analysis method. According to the track deformation and track irregularity diagram, the track irregularity diagram at the pier settlement is obtained. The method and device for calculating the track irregularity at the bridge pier settlement provided by the embodiment and the electronic apparatus can accurately obtain the track irregularity at abridge pier settlement.

Method and device for calculating track irregularity at bridge pier settlement and electronic apparatus

The invention relates to a strengthening construction method for a railway switch area line. The method comprises the following steps of dividing a construction area into sub areas and separately strengthening the sub areas when the scale of a switch area is large; supporting the sleeper bottom of an existing concrete sleeper by using I-steel transverse beams, arranging two I-steel longitudinal beams on the two sides of each track, locally strengthening a switch and connecting the I-steel transverse beams with the I-steel longitudinal beams through sleeves in the sub areas so that the two sub areas form a whole body; strengthening the area close to a precast frame bridge first; jacking the strengthened frame bridge; and strengthening the rest sub areas before the front edge of the bridge is jacked into the sub areas. The strengthening construction method for the railway switch area line, provided by the invention, is advantaged in that a difficulty problem that a complicated railway switch area line is hard to strengthen is solved; the frame bridge can be accurately jacked in place on the premise that running safety and line safety are assured; the integrity of a line strengthening system is guaranteed; the safety and stability of the railway switch area line are strong; the strengthening construction cost is low; the strengthening operation process is simple; the number of used machines and equipment is less; and the strengthening construction progress is fast.

Strengthening construction method for railway switch area line

PROBLEM TO BE SOLVED: To enable joint and replacement work of a concrete slab to be performed simply and quickly so as to shorten a work periodSOLUTION: A concrete slab joint method includes the steps of making an insertion hole through which a bolt can be inserted into an upper flange, placing a concrete slab to which a fastener is embedded and fixed on the upper flange, and inserting both or one of the concrete slab and a fixture provided below the upper flange through the insertion hole, which are connected with each other, so as to connect the upper flange and the concrete slab thereonSELECTED DRAWING: Figure 1

Concrete slab joint method, concrete slab replacement method, concrete slab joint structure, and precast concrete slab

The invention relates to the technical field of high-pier and large-span concrete bridges, in particular to a longitudinal rigidity control method for a high-pier and large-span concrete continuous rigid frame bridge and a bridge. The longitudinal rigidity control method includes the steps that a) a line pier integrated calculation model is established; b) the intensity and the stability of a rail under different working conditions are checked and calculated; c) different loads are applied to the continuous rigid frame bridge, and the influence conditions of the loads on force deformation of a seamless track are checked and calculated; d) the acting force and mutual displacement of a beam rail are analyzed; e) limiting values of the longitudinal rigidity of bridge fixed piers and rail processing measures are determined, and therefore the beam-shaped arrangement rigidity and the rigidity of the fixed piers are determined. The problem that the longitudinal rigidity of the high-pier and large-span continuous rigid frame bridge is difficult to control in the prior art is solved, the void of the high-pier and large-span concrete continuous rigid frame bridge in the longitudinal-rigidity control field is filled, a reference and a basis are provided for design and construction of the bridge, the design cycle is shortened accordingly, and the cost is reduced.

Longitudinal rigidity control method for high-pier and large-span concrete continuous rigid frame bridge and bridge

PROBLEM TO BE SOLVED: To provide a floor slab displacement prevention structure and a floor slab displacement prevention method for a composite beam, which reduce labor for construction.SOLUTION: In a floor slab displacement prevention structure 20 for a composite beam 10 comprising a precast concrete floor slab 13 installed on a steel beam 12, the steel beam 12 has a rivet hole 12b1; the precast concrete floor slab 13 is provided with a displacement prevention hole 13a and fixed to the steel beam 12 by means of the rivet hole 12b1; and a displacement prevention tool 21 inserted into the displacement prevention hole 13a of the precast concrete floor slab 13 is provided.

Floor slab displacement prevention structure and floor slab displacement prevention method for composite beam

PROBLEM TO BE SOLVED: To realize a design aid of a method for filling a clearance between a reinforcing member and an object lateral bridge part by a binding material, by penetrating a penetration bolt through both side parts and the object lateral bridge part of the reinforcing member, by applying the reinforcing member of joining a viaduct column to a bottom part, to a beam or a girder (the object lateral bridge part) of a reinforced concrete structure viaductSOLUTION: A design aid method comprises: an assuming sectional force setting step (a step S2) of setting assuming sectional force of operating on a joining part between the object lateral bridge part and the viaduct column; a temporary setting step (a step S10) of setting a temporary arrangement constitution of the penetration bolt; a bearing force calculation step (steps S22-S28) of calculating first bearing force of the joining part to the bending moment of the viaduct column with one end part in a lateral bridge direction of the reinforcing member as the rotational center and second bearing force to axial force and shearing force in the joining part based on a temporary arrangement constitution; and an evaluation step (a step S30) of evaluating the temporary arrangement constitution based on the assuming sectional force, the first and second bearing forces and a given safety factor

Design aid method, program and design aid device

PROBLEM TO BE SOLVED: To provide a fixing means for a floor slab for railway track capable of fixing the concrete floor slab for railway track securely and firmly when constructing the railway track of composite structure type on an existing steel bridge girder. SOLUTION: This fixing means for the floor slab for railway track is provided with a fixing fitting 5 attached to a lower face part of the floor slab 2 for railway track and abutting on the steel bridge girder 1 to prevent the floor slab 2 for railway track from moving, an adjusting washer 6 attached to the fixing fitting 5 to adjust a position of the fixing fitting 5, and a fixing bolt 7 for fixing the fixing fitting 5 and the adjusting washer 6 on the lower face part of the floor slab 2 for railway track. The fixing fitting 5 is provided with a washer mounting hole 5c for mounting the adjusting washer 6, which is rotatably attached to the washer mounting hole 5c. A bolt hole 6c in which the fixing bolt 7 is inserted is provided at a position where the adjusting washer 6 becomes eccentric. COPYRIGHT: (C)2010,JPO&INPIT

Fixing means for floor slab for railway track

PROBLEM TO BE SOLVED: To provide a reinforcing construction method for a purline-cross beam connection part in an under road girder type steel railway bridge, capable of reducing remarkably an out-of-plane deformation and a stress of an upper flange of the purline causing a fatigue crack, in order to prevent the fatigue crack from being generated in the purline-cross beam connection part of the steel railway bridge, and a device therefor. SOLUTION: Bolt installing holes are drilled respectively in the upper flange 2A of the purline 2 of the purline-cross beam connection part 4 in the under road girder type steel railway bridge, a web 3A of the cross beam 3, and a connection stiffening material 5, and a reinforcement member having respectively corresponding joining faces in the upper flange 2A of the purline 2, the web 3A of the cross beam 3, and the connection stiffening material 5 are attached by bolts 7A, 7B, 7C fastened to the bolt installing holes, in the reinforcing construction method for the purline-cross beam connection part in the under road girder type steel railway bridge. COPYRIGHT: (C)2011,JPO&INPIT

Reinforcing construction method for purline-cross beam connection part in under road girder type steel railway bridge, and device therefor

PROBLEM TO BE SOLVED: To achieve reinforcement of an object lateral frame part (a beam or a girder) of a new RC viaduct, in which the degree of coupling between a reinforcing object part and a reinforcing member is further increased.SOLUTION: A reinforcing member 21 with a U-shaped cross-section is applied to a vertical beam 6 to be reinforced, and through bolts 25 are penetrated through both side parts of the reinforcing member and the vertical beam 6 and they are fixedly connected together by fasteners 26. A clearance between the reinforcing member 21 and the vertical beam 6 (a side clearance D1, a bottom clearance D2, a bolt outer periphery clearance D3) is filled with grout as a binding material and thus a grout layer 28 is formed. The fastener 26 includes a tightening operation part for fixedly fastening it to the through bolt 25 and a fitting part for fitting to a through-hole 21h of the reinforcing member 21. A force F1 from the vertical beam 6 to the through bolt 25 is transmitted by the grout layer 28, and a force F2 from the through bolt 25 to the reinforcing member 21 is transmitted by the fastener 26. Therefore, there is no transmission loss between the reinforcement object and the reinforcing member 21, thus achieving a firm and rigid connection.

Lateral frame structure

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