CN105672203A - Blocking construction method for dyke-dam reinforced concrete culvert pipe - Google Patents

Abstract

The invention discloses a plugging construction method for reinforced concrete culvert pipes of embankments. After concrete plugs are poured downstream of the culvert pipes, a row of holes is drilled on the culvert pipes with a drilling rig at the crest of the embankment or dam, and conduits are embedded in the drilled holes, and the conduits pass through the culvert pipes. Fill the culvert with concrete and seal the culvert. Concrete has low water consumption, large slump, self-flowing and dense, and is easy to fill the culvert. Concrete has good stability, no bleeding, no segregation, and small plastic shrinkage; mixed with an appropriate amount of mineral materials with water absorption, after the concrete solidifies, the water in it is released, and the concrete realizes self-curing without drying shrinkage; less process, The process is simple, the construction period is short, and the construction quality is easy to control; save formwork, avoid vibration, save construction machinery, labor and energy, save resources and investment; good construction conditions, safe and civilized production are guaranteed; strong adaptability of construction technology, suitable for various All sizes of culverts are applicable.

Description

A construction method for plugging reinforced concrete culverts of embankments

technical field

The invention relates to a plugging construction method in the field of building construction research, in particular to a plugging construction method for reinforced concrete culvert pipes of embankments.

Background technique

The reinforced concrete of the culvert is subjected to the erosion of pressure water, erosion, wear of suspended matter, and uneven settlement of the fill around the culvert, resulting in the wear and tear of the surface of the culvert, the precipitation of calcium in the cementitious material and the formation of nodules, the loosening of the concrete and the leakage of the steel bar. , the protective layer cracks and falls off, the steel bars are exposed, the culvert pipes are cracked, the pressure water seeps out, and the soil around the culvert pipes is emptied, resulting in leakage channels along the culvert pipes and the collapse of the embankment and dam, which seriously threaten the safety of the embankment and become a safety hazard. , Therefore, after a certain number of years of operation, it must be dismantled and rebuilt or plugged and grouted to be scrapped.

There are mainly two traditional processing methods. One is large excavation, excavating the fill soil on the embankment culvert pipe, taking out the culvert pipe, and then backfilling and compacting the earthwork in situ. The disadvantages are that cofferdams need to be built and excavated with a large amount of engineering and investment; most of the dams are traffic roads, which affect local travel and disturb residents; the excavation is deep and prone to collapse, causing safety accidents; For construction, only small-scale tamping machines or manual tamping can be used, which is difficult to ensure the compactness of the backfill, leaving potential safety hazards for the project; construction is affected by seasons, and must be carried out in dry seasons; the project volume is large and the construction period is long. The other is the internal segmental vertical formwork, ordinary concrete is poured in layers, and it is compacted by manual vibration. After the formwork is removed in the previous section, the next section is poured in the vertical formwork, and the sealing construction is carried out in sections. Due to the large plastic shrinkage and drying shrinkage of ordinary concrete, after the concrete is solidified, there will be voids between the filled concrete and the inner wall of the top of the culvert due to the subsidence and plastic shrinkage of the filled concrete, resulting in leakage and cannot be completely sealed. Therefore, the culvert must be sealed After the plugging is completed, holes are drilled at the top of the embankment to carry out secondary plugging of the void area. The disadvantages are that the inner diameter of the culvert pipe is small, it is difficult for construction personnel and construction machinery to enter, and sometimes it is even impossible to enter, and the operation is difficult; the construction environment is limited, and supervision is difficult to put in place, which often leads to poor project quality; the process is cumbersome and the construction period is long; a lot of labor and resources are wasted and investment; construction in a closed environment is prone to safety production accidents, and due to site constraints, it is difficult to rescue.

Contents of the invention

The object of the present invention is to provide a kind of plugging construction method of reinforced concrete culvert of embankment.

The solution of the present invention to solve the technical problem is: a plugging construction method for reinforced concrete culvert pipes of dikes and dams. After the concrete plug is poured downstream of the culvert pipes, a row of holes is drilled on the culvert pipes with a drilling rig at the crest of the embankment or the dam crest. A conduit is buried in the hole, and concrete is filled into the culvert through the conduit to seal the culvert.

As a further improvement of the above technical solution, the following steps are included,

1) Concrete plugs with a length of about 3m are vertically cast at the downstream end of the culvert with a lower elevation;

2) Drill a row of holes with a drilling rig on the embankment or dam top of the culvert pipe, with a diameter of 120mm to 150mm, and the distance between two adjacent holes is 1.5m;

3) Embed the conduit in the borehole, and pour an appropriate amount of high-fluidity mortar through the conduit;

4) Concrete shall be poured layer by layer into the culvert through the conduit, the thickness of the first layer shall not exceed 1m, and the thickness of each subsequent layer shall not exceed 0.5m;

5) Plug hole by hole from bottom to top until all culverts are blocked.

As a further improvement of the above technical solution, the concrete mix parameters: water-cement ratio 0.40-0.55, sand ratio 37%-42%, unit water consumption 150kg/m3-175kg/m3, fly ash content as cementitious material 0-30% of the mass, retarding type high-efficiency water reducer is 1.5%-2.5% of the mass of the cementitious material, ettringite-based expansion agent is 5%-10%, hydraulic light-burned magnesium oxide expansion agent It is 3.5% to 6% of the mass of the gelling material.

As a further improvement of the above technical solution, the high fluidity mortar is prepared by using sand sieved through a 2.5mm sieve, low water-cement ratio, and mixed with expansion agent.

The beneficial effects of the present invention are: the present invention has the following characteristics: ①The concrete has low water consumption, large slump, self-flowing and dense, and is easy to fill the culvert; ②The concrete has good stability, no bleeding, no segregation, and small plastic shrinkage; Add an appropriate amount of mineral materials with water absorption. After the concrete is solidified, the water in it will be released, and the concrete will achieve self-curing without drying shrinkage; Concrete double-expands in the early and late stages, and does not shrink; ⑤Less process, simple process, short construction period, and easy to control the construction quality; ⑥Save formwork, avoid vibration, save construction machinery, labor and energy, save resources and investment; ⑦Good construction conditions , Safe and civilized production is guaranteed; ⑧The construction technology has strong adaptability and is applicable to culverts of various sizes.

detailed description

The idea, specific structure and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments, so as to fully understand the purpose, features and effects of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative efforts belong to The protection scope of the present invention. In addition, all the connection/connection relationships mentioned in this article do not refer to the direct connection of components, but mean that a better connection structure can be formed by adding or reducing connection accessories according to specific implementation conditions.

A plugging construction method for reinforced concrete culvert pipes of embankments. After pouring concrete plugs downstream of the culvert pipes, a row of holes is drilled on the culvert pipes with a drilling rig at the crest of the embankment or dam, the pipes are embedded in the drilled holes, and the pipes are inserted into the culvert pipes through the pipes. Fill the concrete and seal the culvert.

As a further improvement of the above technical solution, the following steps are included,

1) Concrete plugs with a length of about 3m are vertically cast at the downstream end of the culvert with a lower elevation;

2) Drill a row of holes with a drilling rig on the embankment or dam top of the culvert pipe, with a diameter of 120mm to 150mm, and the distance between two adjacent holes is 1.5m;

3) Embed the conduit in the borehole, and pour an appropriate amount of high-fluidity mortar through the conduit;

4) Pour the filling concrete layer by layer into the culvert through the conduit. The thickness of the first layer of pouring shall not exceed 1m, and the thickness of each subsequent layer shall not exceed 0.5m, so as to avoid detachment between the filling concrete and the inner wall of the top of the culvert due to the subsidence and plastic shrinkage of the filling concrete. Empty, to ensure that the concrete in the culvert is filled tightly, without voids, and without water leakage, so as to achieve effective sealing of the culvert;

5) Plug hole by hole from bottom to top until all culverts are blocked.

Further as a preferred embodiment, the concrete mix ratio parameters: water-cement ratio 0.40-0.55, sand rate 37%-42%, unit water consumption 150kg/m3-175kg/m3, fly ash content equal to the mass of cementitious material The content of retarding high-efficiency superplasticizer is 1.5% to 2.5% of the mass of cementitious material, the content of ettringite expansion agent is 5% to 10%, and the content of hydraulic light-burned magnesium oxide expansion agent is 3.5% to 6% of the mass of the cementitious material. The types of cement include Portland cement, ordinary Portland cement, fly ash cement, slag cement, and mixed cement, and the strength grades are 42.5, 42.5R, 32.5, and 32.5R. Fly ash is Class I or Class II F fly ash. Retarding superplasticizers include naphthalene or polycarboxylate superplasticizers. The ettringite-based expansion agents include UEA, AEA, CEA and the like. This kind of concrete uses retarding high-efficiency water reducing agent to greatly improve the workability of concrete and improve the rheological properties, so that the concrete has the advantages of low water consumption, large slump, self-flowing and dense, full of culverts, and small plastic shrinkage; An appropriate amount of mineral materials with water absorption, after the concrete solidifies, the water in it is released, the concrete realizes self-curing, and does not produce drying shrinkage; mixed with an appropriate amount of ettringite-based expansion agent and hydraulic light-burned magnesia expansion agent, the concrete has Advantages of early and late double expansion, no shrinkage.

As a further preferred embodiment, the high-fluidity mortar is prepared by using sand sieved through a 2.5mm sieve, a low water-cement ratio, and an expansion agent, and the high-fluidity mortar can improve the bonding effect of old and new concrete.

The above is a specific description of the preferred embodiments of the present invention, but the invention is not limited to the described embodiments, those skilled in the art can also make various equivalent modifications or replacements without violating the spirit of the present invention , these equivalent modifications or replacements are all included within the scope defined by the claims of the present application.

Claims (4)

1. the plugging construction method of a dykes and dams RCCP, it is characterized in that: after the casting concrete plug of culvert pipe downstream, on culvert pipe, bore a round with rig at levee crown or dam crest, in boring, imbed conduit, by conduit to fill concrete in culvert pipe, by culvert pipe shutoff.

2. the plugging construction method of dykes and dams RCCP according to claim 1, is characterized in that: comprises the following steps,

1) build the concrete plug of the about 3m of length at the lower culvert pipe downstream formwork erection of elevation;

2) bore a round at levee crown or the dam crest of culvert pipe with rig, aperture 120mm～150mm, the spacing 1.5m in adjacent two holes;

3) in boring, imbed conduit, pour into appropriate high flowability mortar by conduit;

4) by conduit to placement layer by layer fill concrete in culvert pipe, the first floor is built thickness and is no more than 1m, builds thickness and is no more than 0.5m for later every layer;

5) carry out from the bottom up shutoff by hole, until the whole shutoff of culvert pipe complete.

3. the plugging construction method of dykes and dams RCCP according to claim 1 and 2, is characterized in that: described concrete mix parameter: water-cement ratio 0.40～0.55, sand coarse aggregate ratio 37%～42%, unit consumption of water 150kg/m3～175kg/m3, doping quantity of fly ash be Binder Materials quality 0～30%, retarding-type superplasticizer volume be Binder Materials quality 1.5%～2.5%, entringite is that expansive agent dosage 5%～10%, water conservancy project light calcined magnesia swelling agent are 3.5%～6% of Binder Materials quality.

4. the plugging construction method of dykes and dams RCCP according to claim 2, is characterized in that: described high flowability mortar adopted sand, low water-cement ratio that 2.5mm sieved, it is formulated to mix swelling agent.