A construction method of fast-setting polymer grouting for rapid control of slope erosion and landslide. This solution includes a landslide control method and a slope erosion control method: sorting out an operation platform; drilling and grouting of polymer high-pressure jet grouting piles on the diseased slope; drilling a row of grouting water interception holes densely on the rear edge of the diseased slope; drilling, on the operation platform, a plurality of anchor holes on the diseased slope; inserting a ground anchor into each anchor hole and performing polymer grouting to form a polymer anchorage body; laying a steel wire gauze on the surface of the diseased slope, and connecting and fixing the steel wire gauze with the tail end of each ground anchor; spraying a two-component expandable polymer grouting material onto the steel wire gauze to form a polymer anti-scour layer; drilling a plurality of planting holes on the diseased slope with a backpack drill through meshes of the steel wire gauze; and filling each planting hole with grass seed mixed nutrient soil. The present invention has the advantages of short construction period, ecological and environmental protection, convenient construction, high strength and strong scour resistance.

A construction method of fast-setting polymer grouting for rapid control of slope erosion and landslide. This solution includes a landslide control method and a slope erosion control method: sorting out an operation platform; drilling and grouting of polymer high-pressure jet grouting piles on the diseased slope; drilling a row of grouting water interception holes densely on the rear edge of the diseased slope; drilling, on the operation platform, a plurality of anchor holes on the diseased slope; inserting a ground anchor into each anchor hole and performing polymer grouting to form a polymer anchorage body; laying a steel wire gauze on the surface of the diseased slope, and connecting and fixing the steel wire gauze with the tail end of each ground anchor; spraying a two-component expandable polymer grouting material onto the steel wire gauze to form a polymer anti-scour layer; drilling a plurality of planting holes on the diseased slope with a backpack drill through meshes of the steel wire gauze; and filling each planting hole with grass seed mixed nutrient soil. The present invention has the advantages of short construction period, ecological and environmental protection, convenient construction, high strength and strong scour resistance.

A system for and method of stabilizing rail track structures using a load transfer apparatus is disclosed. The load transfer apparatus includes a vertical load transfer element and a top load transfer element, wherein the top load transfer element is used to transfer applied locomotive and rail car loads to the vertical load transfer element. In one embodiment, the top load transfer element includes helical flights. In another embodiment, the top load transfer element includes a flared top. In yet another embodiment, the top load transfer element includes a load transfer cap. In a further embodiment, the top load transfer element includes two or more support legs each with a top support attached thereto. The railroad stabilization system can comprise any one type or any combinations of types of the aforementioned load transfer apparatuses.

A system for and method of stabilizing rail track structures using a load transfer apparatus is disclosed. The load transfer apparatus includes a vertical load transfer element and a top load transfer element, wherein the top load transfer element is used to transfer applied locomotive and rail car loads to the vertical load transfer element. In one embodiment, the top load transfer element includes helical flights. In another embodiment, the top load transfer element includes a flared top. In yet another embodiment, the top load transfer element includes a load transfer cap. In a further embodiment, the top load transfer element includes two or more support legs each with a top support attached thereto. The railroad stabilization system can comprise any one type or any combinations of types of the aforementioned load transfer apparatuses.

A system for and method of stabilizing rail track structures using a load transfer apparatus is disclosed. The load transfer apparatus includes a vertical load transfer element with at least one cross-sectional rib and a top load transfer element with at least one longitudinal vertical fin, wherein the top load transfer element is used to transfer applied locomotive and rail car loads to the vertical load transfer element. In one embodiment, the vertical load transfer element comprises a plurality of cross-sectional ribs spaced along a length of the vertical load transfer element. In another embodiment, the top load transfer element comprises a plurality of longitudinal vertical fins spaced along a perimeter of the top load transfer element to enhance stability of the top load transfer element.

A system for and method of stabilizing rail track structures using a load transfer apparatus is disclosed. The load transfer apparatus includes a vertical load transfer element with at least one cross-sectional rib and a top load transfer element with at least one longitudinal vertical fin, wherein the top load transfer element is used to transfer applied locomotive and rail car loads to the vertical load transfer element. In one embodiment, the vertical load transfer element comprises a plurality of cross-sectional ribs spaced along a length of the vertical load transfer element. In another embodiment, the top load transfer element comprises a plurality of longitudinal vertical fins spaced along a perimeter of the top load transfer element to enhance stability of the top load transfer element.

Disclosed is a construction method for overhead jacking of a multi-track existing railway of a frame bridge. By means of construction modes of transition overhead construction-dewatering construction-formal overhead and two-end opposite jacking and middle cast-in-place, the risk caused by the groundwater level to a dig-hole pile is directly avoided. The overall construction scheme for the overpass pipe section follows the principle of segmented construction and line production, a jacking part of the overpass is firstly constructed, and after the jacking part is in place, a middle frame is cast in place, which guarantees not only the railway operation but also the construction period quality, and thus good economic benefits and construction guidance significance are achieved.

The present invention relates to a hydraulic down-the-hole hammer. The hammer comprises an elongate shaft and a piston having a central bore therethrough, the piston slidably mounted for reciprocal movement on the shaft and arranged to impact a percussion bit. Forward and rear drive chambers for the piston are disposed between the piston and the shaft and the forward chamber is separated from the rear chamber by an annular shoulder formed internally of the piston bore. The hammer also comprises a control valve to control reciprocation of the piston, wherein the control valve is arranged within the central bore of the piston. The hammer may be a disposable water hammer in which the piston is an outermost component of the hammer.

A pile shoring wall includes tangent concrete piles that are formed in the ground at an excavation site. The tangent concrete piles include a plurality of a first type of concrete piles in the ground at depths wherein the average depth is d.sub.1 and a plurality of a second type of concrete piles. The second type of concrete piles includes 10% and less than 50% of the tangent concrete piles, and each have a shaft of a helical pile secured therewithin. Each helical pile has a bottom portion with helical flights for screwing the helical pile into the ground, and each helical pile is set into the ground to a depth of at least about 2 m below d.sub.1. The helical flights of each helical pile are exposed to the surrounding soil and increase resistance below an excavation depth when the site is excavated.

A pile shoring wall includes tangent concrete piles that are formed in the ground at an excavation site. The tangent concrete piles include a plurality of a first type of concrete piles in the ground at depths wherein the average depth is d.sub.1 and a plurality of a second type of concrete piles. The second type of concrete piles includes 10% and less than 50% of the tangent concrete piles, and each have a shaft of a helical pile secured therewithin. Each helical pile has a bottom portion with helical flights for screwing the helical pile into the ground, and each helical pile is set into the ground to a depth of at least about 2 m below d.sub.1. The helical flights of each helical pile are exposed to the surrounding soil and increase resistance below an excavation depth when the site is excavated.