39results about How to "Pour dense" patented technology

The invention relates to the field of bridge construction, and particularly relates to a side arch rib construction method and a side arch rib. The side arch rib construction method comprises the following steps that a foundation of the side arch rib is pretreated, and prepressing inspection is conducted on the foundation; a mounting bracket of the side arch rib is erected on the foundation, and apreset arc-shaped surface is formed at the top end of the mounting bracket during erection; a side arch rib formwork is mounted on the mounting bracket, and concrete is poured in a layered mode to form the arch rib; and a formwork of a mounting end cross beam at the upper end of the arch rib is extended, and concrete is poured in a layered mode to connect the arch ribs on the two sides of a bridge in the transverse direction. According to the side arch rib construction method and the side arch rib, the preset arc-shaped surface is formed at the top end of the mounting bracket, so that the erected mounting bracket can be matched with the bending shape of the arch rib, thus effective supporting of bracket stand columns to the side arch rib is ensured, and the compactness and strength of theconcrete are ensured through the layered pouring mode.

The invention discloses a whole-process visible anti-void forward top reaching construction method for tunnel vault concrete. A plurality of pouring holes are sequentially formed at intervals in the length direction of a tunnel vault by using a lining trolley, and each pouring hole is provided with an anti-void forward top reaching device; the anti-void forward top reaching devices and a visible pouring device are used for forward concrete layered pouring of a hole I; concrete pouring of a hole II, a hole III and the like is carried out according to the concrete pouring method of the hole I; after it is confirmed that a hole is filled with concrete after pouring, vibration and filling top reaching are carried out on all pouring holes except the adjacent former hole; and concrete pouring ofthe last hole is carried out, a video probe is moved to a reserved observation hole of an end template for observation, and then all pouring holes are subjected to vibration and filling top reaching. By means of the method, dense and full pouring of vault concrete is ensured through forward layered pouring, layered top reaching, repeated filling top reaching and the visible pouring device, and the problem of tunnel lining void is solved.

The invention discloses a diaphragm wall construction method. The diaphragm wall construction method includes the steps that firstly, trench forming is conducted; and secondly, reinforcement cage hoisting is conducted. The diaphragm wall construction method is characterized by further including the step that thirdly, concrete pouring is conducted, wherein concrete is stirred in the pouring processthrough vibration devices on the reinforcement cage, and wall forming is conducted. According to the diaphragm wall construction method, the concrete is helped by the vibration devices to penetrate through the reinforcement cage from the inner portion of the reinforcement cage and to flow to the portion outside the reinforcement cage, the whole reinforcement cage is wrapped in the concrete, and the risk that the reinforcement cage is exposed and corroded is prevented. Motors and vibrating bars are adopted for the vibration devices, the vibration range can be increased, more concrete can be vibrated so that liquidity can be enhanced, and distribution is more uniform.

The invention relates to the technical field of wallboard production, and particularly discloses a preparation method for an energy-saving ceramsite lightweight wallboard. The method comprises the following steps that S1, a rectangular heat preservation wall core is selected, a plurality of V-shaped through holes are formed in the heat preservation wall core, each through hole comprises two open ends and a connecting end, sodium bicarbonate is placed at the connecting ends, and a plurality of fine grooves are formed in the surface of the heat preservation wall core; S2, a mold is selected, theheat preservation wall core is vertically placed into the mold, one side edge of the heat preservation wall core is enabled to be in contact with the bottom of the mold; S3, net racks are placed on the two sides of the heat preservation wall core correspondingly; S4, a concrete filler with the filling components comprising cement, mixing water, river sand, ceramsite, a water reducer, fly ash, cellulose and an early strength agent is mixed and then is injected into the mold; S5, vibrating is performed on the concrete filler; and S6, demoulding is performed after the concrete filler is solidified and hardened, and the energy-saving ceramsite lightweight wallboard is prepared after demoulding. By adopting the technical scheme, the wallboard can have the relatively high compression resistance.

The invention relates to the technical field of wallboard production, in particular to a thermal insulation ceramsite light wallboard. The thermal insulation ceramsite light wallboard comprises a wallboard body, the wallboard body comprises wall surface layers on both sides, a thermal insulation wall core located between the wall surface layers on both sides and a net rack located in a wall surface. The wall surface layers are filled with concrete. The wall surface layers on both sides cover the thermal insulation wall core and the net rack. A plurality of through holes are formed in the thermal insulation wall core, the through holes are in the shape of a V, and the each through hole comprises two open ends and a connecting end. The two open ends are located on both sides of the thermal insulation wall core, the connecting end is located inside the thermal insulation wall core, and sodium bicarbonate is placed at the connecting end. A plurality of fine grooves are formed in the surface of the thermal insulation wall core. The net rack includes a plurality of vertical steel wires parallel to the wall surface layers. The filling components of the concrete of the wall surface layersinclude cement, mixing water, river sand, ceramsite, a water-reducing agent, fly ash, cellulose, a water-reducing agent and an early strength agent. According to the technical scheme of the thermal insulation ceramsite light wallboard, the wallboard is enabled to have high pressure resistance ability.

The invention provides a concrete pouring method for a tubular turbine unit runner of navigation-power junction engineering. The method comprises steps as follows: prefabrication of form baffles; mounting of the form baffles; pouring of concrete at the horizontal section of the runner and dismounting of the form baffles; setting of construction joints of the runner; pouring of foundation concreteof side wall structure sections of the runner; prefabrication of curved forms; mounting of the curved forms; pouring of curved concrete of the runner; dismounting of forms at the lower part of the runner and a secondary plastering process. The contact area of two sections of concrete construction joints is increased through the construction joints formed by the form baffles, the problem that bottom concrete is difficult to pour compactly due to curved steel bars is solved, and concrete can be poured compactly; the problems that curved surfaces and horizontal planes cannot be contacted and vibrated uniformly through conventional pouring due to the fact that the included angle at the junction of the arc section and the horizontal section of the runner is smaller are solved through dismounting of forms at the lower part of the runner and the secondary plastering process, so that the surface flatness, plastering quality and linear control of the runner meet the design requirement.

The invention discloses a large-span long-cantilever connection structure and a construction technique. The structure plane is arranged in the form of rectangle, two towers are arranged beneath the standard layer, wherein a tower is a cylinder body (4), the left and right sides of the tower respectively support a large-span and long-cantilever floor at the upper part, and the width of the cylinder body (4) is less than the width of the floor at the upper part, and the vertical face of the tower forms a model with a wide upper part and a narrow lower part; the other one tower is a framework shear wall structure. The large-span and long-cantilever is connected to the two towers through a side-span steel truss (1) and a middle-span steel truss (2) which are penetrated to each other. The side-span steel truss (1) is arranged within the scale of the cylinder (4), and supported on a supporting steel truss (3) extended from the cylinder (4) along the vertical direction. A steel framework beam (7) and a secondary steel beam (8) are equally arranged on the upper floor so as to form a floor cover supporting system. The floor cover adopts a steel bar truss floor support plate. The large-span long-cantilever connection structure solves the technical problem that the vertical face model is the connection structure with the wide upper part and the narrow lower part, and suitable for multi-layer and high rise buildings; moreover, the large-span long-cantilever connection structure has very strong universality and application scale.

The invention discloses a partially-prefabricated assembled rear-stacking hollow floor, comprising cast-in-place floor bottom slabs, a cast-in-place rib beam slab grid and prefabricated flat slabs; a bottom formwork and beam rib side formworks are erected, and bottom slab and rib beam rebars are tied; the hollow floor bottom slabs and rib beam concrete are then cast, a construction joint is reserved at the bottom of the top slabs, the prefabricated flat plates corresponding to hollows in size are lifted to the tops of rib beams, stress-bearing vertical bars connected with hidden beams are arranged correspondingly at the rib beams, and secondary casting is performed at the rib beams between the flat slabs so as to finish maintenance. The inner formwork material in the hollow floor is omitted, and two novel hollow floor structures cast by means of secondary stacking are constructed. The partially-prefabricated assembled rear-stacking hollow floor with the structure allows all aforementioned problems present in traditional hollow floors can be solved, and construction difficulty is not reduced.

The invention discloses an underwater bottom sealing concrete construction method using a steel truss for reinforcement and belongs to the field of underwater bottom sealing for deep foundation pit construction. The underwater bottom sealing concrete construction method using the steel truss for reinforcement comprises the steps that after a cofferdam is installed or an underground diaphragm wall is constructed, underwater excavation is conducted in a foundation pit till the bottom elevation of bottom sealing concrete is reached; the steel truss is machined piece by piece or integrally on site on land; the steel truss is hoisted and lowered in place integrally or piece by piece; a bottom sealing platform is built, a central collection hopper and a chute are arranged, and a plurality of bottom sealing guide pipes are lowered; mixed concrete is conveyed to the site; tank opening is conducted step by step for head sealing construction, and then normal pouring is conducted; and the bottom sealing guide pipes, the central collection hopper, the chute and the bottom sealing platform are dismounted after bottom sealing is completed, and water pumping is conducted after the strength of the bottom sealing concrete reaches the design strength. By the adoption of the underwater bottom sealing concrete construction method using the steel truss for reinforcement, the reinforcement effect can be achieved, and the thickness of the bottom sealing concrete is reduced, so that the purpose of reducing the construction cost is achieved, the construction difficulty of the underwater bottom sealing concrete can be lowered, and the construction quality and construction safety of the bottom sealing concrete are guaranteed.

The invention discloses a whole-process visible anti-void forward top reaching construction method for tunnel vault concrete. A plurality of pouring holes are sequentially formed at intervals in the length direction of a tunnel vault by using a lining trolley, and each pouring hole is provided with an anti-void forward top reaching device; the anti-void forward top reaching devices and a visible pouring device are used for forward concrete layered pouring of a hole I; concrete pouring of a hole II, a hole III and the like is carried out according to the concrete pouring method of the hole I; after it is confirmed that a hole is filled with concrete after pouring, vibration and filling top reaching are carried out on all pouring holes except the adjacent former hole; and concrete pouring ofthe last hole is carried out, a video probe is moved to a reserved observation hole of an end template for observation, and then all pouring holes are subjected to vibration and filling top reaching. By means of the method, dense and full pouring of vault concrete is ensured through forward layered pouring, layered top reaching, repeated filling top reaching and the visible pouring device, and the problem of tunnel lining void is solved.