CN211646272U

CN211646272U - Self-compaction rock-fill concrete gravity dam body structure

Info

Publication number: CN211646272U
Application number: CN201922025196.0U
Authority: CN
Inventors: 陈刚; 田晓平; 蒙志彬
Original assignee: Guizhou Water Construction Engineering Co ltd
Current assignee: Guizhou Water Construction Engineering Co ltd
Priority date: 2019-11-21
Filing date: 2019-11-21
Publication date: 2020-10-09
Anticipated expiration: 2029-11-21

Abstract

The utility model discloses a self-compaction heap stone concrete gravity dam body structure, it includes reinforcing bar layer, heap stone material layer and concrete material, the heap stone material layer is located the centre and the vertical arrangement of dam body, arranges the vertical reinforcing bar layer of arranging on the both sides limit on heap stone material layer, including the concrete material is with heap stone material layer and reinforcing bar layer cladding. By adopting the rockfill concrete structure, the concrete pouring amount of the dam body can be greatly reduced, the construction cost is greatly reduced, the construction efficiency is improved, and meanwhile, due to the heat dissipation effect of the rockfill, the hydration heat of the concrete can be greatly reduced, and a good field construction effect is obtained.

Description

Self-compaction rock-fill concrete gravity dam body structure

Technical Field

The utility model relates to a concrete gravity dam especially relates to a self-compaction rock-fill concrete gravity dam body structure, belongs to concrete dam technical field.

Background

The gravity dam is used for water conservancy and hydropower engineering in a large number, the concrete pouring amount is large, a large amount of hydration heat can be generated at the same time, a general construction process adopts multi-stage batching, the maximum particle size of aggregate can reach 15cm, but the limit of the conventional concrete stirring and vibrating capacity is difficult, the construction quality of the gravity dam can be improved, the construction cost is reduced, the construction efficiency is improved, and the technical problem which needs to be solved at present is solved.

Disclosure of Invention

The to-be-solved technical problem of the utility model is: the utility model provides a self-compaction rock-fill concrete gravity dam body structure, through adopting the rock-fill concrete structure, the concrete placement volume that can greatly reduced dam body, greatly reduced construction cost has improved the efficiency of construction, simultaneously because there is the radiating action of rock-fill, can greatly reduced the heat of hydration of concrete, the effectual problem of having solved the aforesaid existence.

The technical scheme of the utility model is that: the utility model provides a self-compaction heap stone concrete gravity dam body structure, it includes reinforcing bar layer, heap stone material layer and concrete material, the heap stone material layer is located the middle and vertical arrangement of dam body, has arranged the reinforcing bar layer of vertical arrangement on the both sides limit on heap stone material layer, the concrete material is including with the cladding of heap stone material layer and reinforcing bar layer.

The reinforcing steel bar layer comprises reinforcing steel bars which are horizontally and vertically arranged uniformly.

The particle size of the rockfill material layer is 300-1000 mm, and the maximum particle size of the rockfill should not exceed 1/4 of the minimum side length of the cross section of the dam structure.

The utility model has the advantages that: compared with the prior art, adopt the technical scheme of the utility model, through adopting the rockfill concrete structure, the particle diameter of rockfill is big, so the concrete consumption just significantly reduces, the cost is reduced, the adiabatic temperature rise of concrete has also effectively been reduced simultaneously, the control by temperature change measure has been simplified, at this moment only need mix the concrete of little particle diameter can, the requirement to the mixing plant has just reduced, and no longer need vibrate, construction process simplifies greatly, the efficiency of construction improves greatly, the time limit for a project also can subtract the weak point, simultaneously because there is the radiating action of rockfill, can greatly reduced the heat of hydration of concrete, fine result of use has been gained.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a sectional view of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.

Example 1: as shown in fig. 1-2, a self-compacting rock-fill concrete gravity dam structure comprises a reinforcement layer 2, a rock-fill material layer 1 and a concrete material 3, wherein the rock-fill material layer 1 is positioned in the middle of the dam body and is vertically arranged, the reinforcement layer 2 which is vertically arranged is arranged on two side edges of the rock-fill material layer 1, and the concrete material (3) covers the rock-fill material layer 1 and the reinforcement layer 2.

Further, the reinforcing steel bar layer 2 comprises reinforcing steel bars which are horizontally and vertically and uniformly arranged.

Furthermore, the particle size of the rockfill material layer 1 is 300-1000 mm, and the maximum particle size of the rockfill should not exceed 1/4 of the minimum side length of the cross section of the dam body structure.

A construction method of a self-compacting rock-fill concrete gravity dam body structure comprises the following steps: firstly, cleaning the bin surface; secondly, installing a template and binding reinforcing steel bars; thirdly, stacking the rock blocks; fourthly, mixing the high self-compaction concrete; fifthly, transporting concrete; sixthly, pouring the high self-compaction concrete; and seventhly, maintaining.

Further, in the step one, the step of cleaning the bin surface is as follows: A. the surface of the bin is washed and cleaned by a high-pressure water gun, so that the surface is ensured to have no sundries, accumulated water and soil; B. the bin surface is chiseled by a hand drill to increase the effective combination of concrete; when the storehouse face chisel hair was handled, forbidden because of the pointing phenomenon that appears of chisel hair strictly.

Furthermore, in the third step, the particle size of the rockfill material is selected to be more than 300mm and less than 1000mm, the maximum particle size should not exceed the minimum edge 1/4 of the structural section and not exceed 1.0m, and the rockfill material cannot be stacked in a centralized manner. The mud content of the rockfill material is less than or equal to 0.5 percent and is not allowed to contain mud blocks.

Further, in the fourth step, an additive special for rock-fill concrete is added, wherein the model of the special additive is HSNG-T, and the manufacturer is Beijing Hua Shi Nao solid technology Co.

In this example, fly ash produced in Guizhou Qianbei power plant is selected as fly ash for mixing high self-compaction concrete, and the fly ash is F-class and has a second grade.

In the embodiment, the high self-compaction concrete fine aggregate is prepared by mixing PCS1112 secondary adjustable box type crusher combined with hammer crusher, the fineness modulus is 2.9-3.0, and the powder content is 16-18.

The high-self-compaction-performance concrete coarse aggregate is produced by a project sandstone aggregate processing system, small stones with the particle size of 5-20 mm are selected as the coarse aggregate in the high-self-compaction-performance concrete, the maximum particle size of the coarse aggregate is not more than 20mm, and the content of needle-shaped particles is not more than 8%.

In the embodiment, the PCS1112 secondary adjustable box type crusher is adopted to produce sand with the particle size of less than 5mm (the storage capacity is about 800 m) by screening through a rocker arm screen³) Small stone with 5-20 mm grain diameter (storage capacity about 600 m)³) Medium stone with a particle size of 20-40 mm (storage capacity about 500 m)³). In the field production, sand, small stones, medium stones and medium sand are produced through a rocker arm screen, and the small stones, the medium stones and the medium sand are adjusted according to the actual usage amount of each bin.

Further, in the sixth step, the high self-compaction performance concrete is delivered into a bin in a concrete pump conveying mode, and a tower crane is used for lifting a pouring pipe for pouring; the face rockfill after pouring ensures that the exposed height of partial bare stones is 10cm, and the exposed area of the upstream face is 50% of the area 1/3 of the upstream side bin face.

Further, after the high-self-compaction-performance concrete is discharged from the mixing machine, the concrete is transported by adopting a chute and a DN250 chute, a collecting hopper is additionally arranged in the middle, and the capacity of the collecting hopper is more than 1.5m³So as to avoid aggregate separation phenomenon of the concrete in the transportation process.

Furthermore, a stone washing field is arranged in a stockyard of the stone storage yard, a submersible pump is adopted to wash the block stones entering the warehouse, and an excavator overturns to ensure the washing quality.

Through adopting the rock-fill concrete structure, the particle diameter of rock-fill is big, so the concrete consumption just significantly reduces, the cost is reduced, the adiabatic temperature rise of concrete also can effectively be reduced simultaneously, the control by temperature change measure has been simplified, at this moment only need the concrete of the little particle diameter of mix can, the requirement to the mixing plant has just reduced, and no longer need vibrate, the construction process is greatly simplified, the efficiency of construction improves greatly, the time limit for a project also can be shortened, simultaneously because there is the radiating action of rock-fill, the hydration heat of concrete can greatly reduced, fine result of use has been gained.

The parts of the present invention not described in detail are the known techniques of those skilled in the art. Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims

1. The utility model provides a self-compaction rock-fill concrete gravity dam body structure which characterized in that: it includes reinforcing bar layer (2), rockfill material layer (1) and concrete material (3), the rockfill material layer (1) is located the centre of dam body and vertical the arranging, has arranged the reinforcing bar layer (2) of vertical the arranging on the both sides limit of rockfill material layer (1), concrete material (3) are including the cladding of rockfill material layer (1) and reinforcing bar layer (2).

2. The self-compacting rock-fill concrete gravity dam structure of claim 1, wherein: the reinforcing steel bar layer (2) comprises reinforcing steel bars which are horizontally and vertically arranged uniformly.

3. The self-compacting rock-fill concrete gravity dam structure of claim 1, wherein: the particle size of the rockfill material layer (1) is 300-1000 mm, and the maximum particle size of the rockfill should not exceed 1/4 of the minimum side length of the cross section of the dam structure.