Abstract

A method for inversion of a corresponding line mileage and offset by using a known coordinate point, comprising: based on coordinates of a known point P and curve elements of a start point and an end point of a curve element, first segmenting or not segmenting the curve element according to a corner of the curve element to obtain a plurality of curve sub-elements (AiBi), and calculating curve elements of the curve sub-elements (AiBi); taking any curve sub-element (AiBi) to calculate a half chord length S and a straight corner θ, and performing precision determination and convergence correction according to S and θ, the point P being always effective with respect to the curve sub-element (AiBi) in the correction process; and performing cyclic convergence calculation to finally obtain a distance from the point P to any point on a chord line or an arc line as an offset of the curve sub-element (AiBi) corresponding to the point P and to obtain a mileage of the curve sub-element (AiBi) corresponding to the point P. By calculating different curve sub-elements (AiBi), an effective offset and an effective mileage of the curve sub-element (AiBi) corresponding to the point P can be finally obtained. The method is suitable for mileage inversion of curve elements which comprise a large-corner curve element, the calculation process is always converged, the situation that calculation cannot be performed is avoided, and the calculation process is relatively simple.

IPC Classes  ?

• G06F 17/10 - Complex mathematical operations
• G06F 17/18 - Complex mathematical operations for evaluating statistical data

Abstract

Disclosed in the present invention are a shield tail outer side grout stop device and a construction method therefor. The grout stop device comprises at least two sets of grout stop assemblies, the grout stop assemblies are distributed in the length direction of a shield tail and connected to the outer side of the shield tail, each grout stop assembly comprises a plurality of grout stop plates, the grout stop plates are arranged in the circumferential direction of the outer side of the shield tail in a staggered lapping manner, each grout stop plate comprises a plurality of overlapped alloy plates, each alloy plate comprises a first bent portion and a second bent portion, the first bent portion is parallel to the length direction of the shield tail, and the angle between the second bent portion and the length direction of the shield tail is 20 to 80 degrees. The grout stop device of the present invention is provided with multiple sets of grout stop assemblies on the outer side of the shield tail, and thus can effectively stop grout by means of layered blocking, avoiding the problems of grout leakage at the shield tail and shield blocking due to grout return, improving grouting quality, and improving construction efficiency.

IPC Classes  ?

• E21D 11/00 - Lining tunnels, galleries or other underground cavities, e.g. large underground chambersLinings thereforMaking such linings in situ, e.g. by assembling
• E21D 9/06 - Making by using a driving shield

Abstract

Disclosed are an imprinting material (1), and a roughening construction method for a new and old concrete joint surface. The imprinting material (1) comprises a bottom plate (11) and a plurality of bulges (12) fixed on the bottom plate (11), and the bulges (12) are used for forming an uneven concrete surface. Before initial setting of concrete, the imprinting material (1) is laid on the surface of the concrete; then the bulges (12) on the imprinting material (1) are pressed into the concrete surface; and after the strength of the concrete reaches 2.5-5 MPa, the imprinting material (1) is removed. The imprinting material (1) enables a new and old concrete joint surface to be successfully embedded and fixed, a roughening process is easy to control, and same has a high applicability.

IPC Classes  ?

• E01C 19/43 - Machines or arrangements for roughening or patterning freshly-laid paving courses, e.g. indenting rollers

Abstract

A grouting pipe and a method of reinforcing a tunnel (5) by surface grouting. The grouting pipe comprises a first sleeve valve pipe (1), a second sleeve valve pipe (2) and a third sleeve valve pipe (4). The sleeve valve pipes are connected in a sleeved manner and perform grouting by means of grout holes (3) on the sleeve valve pipes. The method comprises steps: 1. sampling and testing soil in a tunnel (5) and determining soil parameters; 2. performing surveying and leveling of a construction site; 3. drilling and preparing an outer cover material (7); and 4. performing grouting section by section by means of the grout holes. The method performs surface grouting to reinforce the tunnel (5) by means of a surface-constructed grouting pipe and is applicable to extremely deep tunnels (5) as well as tunnels (5) of normal depth, and is also applicable to various geological structures.

IPC Classes  ?

• E21D 9/00 - Tunnels or galleries, with or without liningsMethods or apparatus for making thereofLayout of tunnels or galleries

Abstract

A method for construction of a shaft lining. A hanging scaffold-formwork device (3), a lifting device (1) and a suspension and anchoring device (2) are used to perform the following steps of the method for construction of a shaft lining: laying, tying, lifting, suspending and anchoring, formwork erection, material feeding and formwork filling, formwork removal, and separation. The method for construction of a shaft lining enables construction of a shaft lining to be completed easily, quickly and safely, thereby reducing the required time, amount of labor and materials, while improving work efficiency, and accelerating construction.

IPC Classes  ?

• E21D 5/04 - Lining shaftsLinings therefor with brick, concrete, stone, or similar building materials
• E21D 5/12 - Accessories for making shaft linings, e.g. suspended cradles, shutterings

Abstract

A method for excavating a tunnel shaft (1), by drilling a number of holes I (2) with smaller diameters, it is possible to predict groundwater and bad geology etc. in advance, which is convenient for confirming the degree of coincidence of the geological survey data, so as to provide guidance for subsequent construction and reduce construction risks and difficulties, at the same time, the excavation from top to bottom does not require the restriction of the formation of a positive hole at the bottom of the shaft (1), it can also be constructed in a non-blasting manner, which has high safety and can loosen the rock and soil in advance, improves the construction efficiency of excavation, and shortens the construction period.

IPC Classes  ?

• E21D 1/03 - Sinking shafts mechanically
• E21D 1/08 - Sinking shafts while moving the lining downwards
• E21B 7/00 - Special methods or apparatus for drilling

Abstract

A construction method for the upright lifting of a large-tonnage box girder to a bridge, and an erection method for a large-tonnage box girder. The construction method comprises: construct a lifting station (2) at a reserved bridge pier (1); dispose box girder lifting bases (3), lifter traveling rails (4), and mounting lifters (6) in the lifting station (2); the lifters (6) directly erect a box girder (7) in a way that the lifters (6) travel to positions above the bases (3) and erect the box girder (7). The erection method further comprises: the lifters (6) lift a single set of transport carrier apparatus or two sets of transport carrier apparatuses onto a bridge; a box girder transport vehicle (9) cooperates with a bridge erecting machine (10) to repeatedly complete the erection of the box girder (7); the lifters (6) hoist the transport carrier apparatus off the bridge; the lifters (6) lift a box girder (7) within the scope of the reserved bridge pier (1) to the erected box girder (7); construct the reserved bridge pier (1); the lifters (6) complete the erection of the box girder (7) within the scope of the reserved bridge pier (1). The construction method and erection method for the box girder occupy a small space and feature high efficiency.

IPC Classes  ?

• E01D 21/00 - Methods or apparatus specially adapted for erecting or assembling bridges