The utility model provides a rockfall protection device for the top of an open cut tunnel, which belongs to the technical field of disaster control and comprises an elastic buffer device and a top plate arranged at the top of the elastic buffer device. The top plate comprises a main plate and two side plates which are arranged at the two ends of the main plate respectively and incline downwards. The elastic buffering device comprises two first buffering pieces which are parallel to each other and arranged in a spaced mode, a first partition plate which is connected with the two first bufferingpieces and arranged at the tops of the first buffering pieces, and second buffering pieces which are arranged on the upper end faces of the first partition plates, and the tops of the second buffering pieces are connected with the lower end face of the main plate. The telescopic direction of the first buffer piece and the telescopic direction of the second buffer piece are the vertical direction.The rockfall protection device for the top of the open cut tunnel is good in protection effect, rockfall on the protection device does not need to be cleaned manually at regular intervals, and the rockfall protection device is more convenient to use.

Rockfall protection device for top of open cut tunnel

The invention relates to an underground-cross structure road and bridge foundation, which relates to the technical field of road and bridge construction engineering, and comprises a pier stud, which vertically supports the bridge, and a beam-type cushion cap and a pile base, which are buried underground. The pier stud supports the beam-type cushion cap, and the beam-type cushion cap supports the pile base, and the pile base is disposed at two sides of an underground structure to be crossed over along the vertical direction. The beam-type cushion cap comprises a small cushion cap on the pile base at the same side of the underground structure, and a binder of a small cushion cap, which is horizontally connected to two sides of a tunnel. The pier stud is disposed at the middle part of the binder at the width direction along the width direction, and is arranged at any positions of the binder and the top face of the cushion cap along the length direction. The invention is advantageous in that with the adoption of the binder underground-cross structure connecting two small cushion caps, the conflict between the bridge pile foundation and the underground structure can be avoided; the influence of span arrangement of the underground engineering bridge can be greatly reduced; the beam-type cushion cap structure is a cross structure buried underground, and thereby the ground-occupied area can be greatly reduced.

Underground-cross structure road and bridge foundation

The invention provides a box-type modular layered composite anti-hardening sand cushion unit. The box-type modular layered composite anti-hardening sand cushion unit comprises a bottom frame, stand columns, corrugated thin steel plates, bolts, cushion blocks and waterproof film layers. The steel angles can be connected through bolts, and the stand columns with the inserting grooves are formed by arranging cushion blocks between the steel angles. A box type unit is erected by four stand columns, and corrugated thin steel plates are inserted into stand column inserting grooves in a layered modeto form a box wall. After each layer is filled with gravel, a waterproof film layer is laid on the upper portion, and a composite sand cushion layer independent unit is formed. The sand cushion has the beneficial technical effects that the waterproof film layer can effectively prevent hardening of the buffer sand cushion layer, the buffer effect of the sand cushion layer is brought into full play,prefabrication and modularization are achieved, replacement is convenient, and adaptability is improved.

Box-type modular layered composite anti-hardening sand cushion unit at top of shed tunnel and construction method

The invention discloses a method for repairing an underground passage. The method for repairing the underground passage comprises the following steps of firstly, downwards driving a plurality of pipepiles in a region, where a deformation joint with a fault is located, of a bottom plate of the underground passage; then chiseling out concrete in the region, where the driven pipe piles are located,of the bottom plate, and conducting expanding excavation downwards and towards the periphery of the chiseled-out area of the bottom plate; applying a pile cap plate in a space formed by expanding excavation, and reworking the chiseled-out area of the bottom plate, wherein the applied pile cap plate extends to the periphery below the chiseled-out area of the bottom plate; and finally carrying out waterproof reinforcement treatment on the areas, located on a side wall and a top plate of the underground passage, of the deformation joint. The multiple pipe piles are driven underground at the deformation joint, then the region, where the pipe piles are driven, of the bottom plate is chiseled out, and the pile cap plate is applied to the tops of the pipe piles, so that the pile cap plate and allthe pipe piles play a bearing role in the underground passage, continuous settlement of the underground passage is effectively prevented, and the deformation joint is unlikely to leak water under thecondition that settlement does not occur.

Method for repairing underground passage

The invention relates to an approximate closed steel box and a spring buffer layer, wherein the buffer layer is arranged above the structural layer at the top of the rock fall prevention structure andincludes a steel box without top face. Springs are evenly arranged in the steel box. An upper steel plate is arranged above the springs.The upper steel plate and the steel box form a closed hexahedron, the top of which can be compressed. According to the invention, a double-layer damping is formed by utilizing a spring layer and a natural process of discharging and returning gas in a basic airtight box body, so that the damage of the falling rock pulse load is effectively reduced, the defects of other buffer layers in the practical application process are solved, and an effective guarantee isprovided for railway operation safety.

Approximate closed steel box and spring buffer layer

The invention relates to a method for treatment of differential settlement of foundations of all sections of a railway tunnel. When serious differential settlement happens to a multi-section structure of the railway tunnel and normal use is influenced, the railway tunnel needs to be dismantled and rebuilt, construction is complex, and the construction period is long. According to the method for treatment of the differential settlement of the foundations of all the sections of the railway tunnel, pile foundations with pile tops lower than a tunnel body are arranged on the four corners of a base plate of a railway tunnel body section to which settlement happens and on the outer side of a lateral wall; brackets are arranged at the positions, corresponding to the pile foundations, of the bottom portion of the lateral wall; jacks are arranged on the pile tops with the pile foundations used as supporting points, the tunnel body section is jacked up by means of the brackets to a design elevation, a gap is formed between the tunnel body section and a tunnel foundation after the tunnel body section is jacked up, and the gap is filled with concrete; the jacks are replaced with concrete blocks, and concrete is poured to enable the pile foundations to be integrally connected with the brackets; water repellent treatment is carried out on a settlement joint. Compared with the method achieved by dismantling and rebuilding, the method for treatment of the differential settlement of the foundations of all the sections of the railway tunnel has the advantages that negative influences caused by dismantling and rebuilding when the serious settlement happens to the tunnel can be reduced, all the sections of the tunnel can be recovered to the design elevations according to design requirements, and the problem of the differential settlement is solved thoroughly.

Method for treatment of differential settlement of foundations of all sections of railway tunnel

The utility model relates to a double-leg rigid-frame pier structure spanning an existing building at a small angle. When a railway bridge and the existing building under the bridge intersect at the small angle, the building can not be spanned by a whole opening, so that opening span arrangement adjustment of the railway bridge in a large range is caused. According to the double-leg rigid-frame pier structure spanning the existing building at the small angle, pile foundations, bearing platforms and a rigid-frame pier are sequentially constructed from bottom to top, and the pile foundations and the bearing platforms arranged on the pile foundations are arranged in two sets and arranged at the two sides of the existing building under the bridge; the rigid-frame pier is a double-leg rigid-frame pier and the middle of the bottom end of the rigid-frame pier is recessed upwards, so that struts at the two sides are formed and placed on the bearing platforms at the two sides; the struts at the two sides of the double-leg rigid-frame pier incline outwards from top to bottom. According to a reinforced concrete double-leg rigid-frame bridge, designed and completed opening span arrangement of the railway bridge can be prevented from being adjusted and modified in the large range and the modification range is reduced; compared with other adjusting schemes, the increased investment amount is small; the construction technique is mature, the construction difficulty is small, and the quality is controllable; the construction period of the double-leg rigid-frame pier structure is short and influence on a total work period by structural adjustment is avoided or reduced.

Double-leg rigid-frame pier structure spanning existing building at small angle

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Approximate closed steel box and spring buffer layer

Method for treatment of differential settlement of foundations of all sections of railway tunnel

Double-leg rigid-frame pier structure spanning existing building at small angle