CN109748549A - A kind of C50 or more underwater concrete and its stake holes casting method - Google Patents

Abstract

The invention discloses a kind of C50 or more underwater concretes and its stake holes casting method, this method first to dig stake holes, and removes a bottom slurry；Steel reinforcement cage is fixedly mounted in stake holes；Rigid conduit is inserted into stake holes bottom；Rubble is inserted to stake holes, is filled up subject to stake holes；Cementitious material slurry is poured into rigid conduit, 5 meters of promotion rigid conduits of every perfusion are primary, promote 4.0~5.0m of rigid conduit height；When there is cementitious material slurry spilling on stake holes surface, illustrates that stake holes has been filled, propose rigid conduit at this time, completes pouring for stake holes.The present invention is apparently higher than the principle of mortar and concrete using the underwater anti-dispersibility of cementitious material slurry, cementitious material slurry and rubble are separately poured, it using the moisture in big flowing cementitious material slurry exclusion rubble gap and is filled in rubble, to improve the density of concrete.

Description

A kind of C50 or more underwater concrete and its stake holes casting method

Technical field

The present invention relates to a kind of C50 or more underwater concrete and its stake holes casting methods, belong to civil construction technical field.

Background technique

The highest level of underwater concrete is C40 at present, and during main cause is underwater concreting, water can seep Enter, even wash away concrete, reduce the density of concrete, causes the concrete strength of entity project to decline more.To solve Above-mentioned difficult point is general both at home and abroad to use two methods: 1. to improve the strength grade of concrete, such as the concreting with C50 The underwater concrete of C30, but can not be with the underwater concrete of the concreting C50 of C80, the concrete strength that this method pours With limitation；2. flocculant is added in concrete, the viscosity and dispersion resistance energy of concrete are improved, but due to high-strength coagulation The viscosity of soil itself is larger, such as reuses flocculant, then viscosity and pumping resistance are larger, is unable to satisfy pumping construction requirement, existing It can not be applied in real engineering.Therefore, above two method has some limitations in practical engineering applications.

Summary of the invention

It is existing to overcome the object of the present invention is to provide a kind of C50 or more underwater concrete and its stake holes casting method Deficiency in technology.

Technical solution of the present invention: a kind of C50 or more underwater concrete, the concrete is by cementitious material slurry and rubble group At, the cementitious material slurry is made of cementitious material, aqueous epoxy resins and self-emulsifying curing agent, water and additive, Wherein cementitious material is made of cement and superfine powder.

Further, the cementitious material is made of cement 70~90 and superfine powder 10~30 at last by weight.

Further, the cementitious material slurry by weight at last by cementitious material 60~80 and aqueous epoxy resins and Self-emulsifying curing agent 2~5, water 18~35 and additive 1~2 form.

Further, the cement is one or more of portland cement, aluminate cement or sulphate aluminium cement.

Further, the superfine powder is silicon powder, superfined flyash, ultra-fine phosphorus slag powder, ultrafine slag powder or nanoscale carbonic acid One or more of calcium powder.

Further, the additive is by weight at last by high-efficiency polycarboxylic acid water reducer 0.5~1.0, cellulose ether 0.2 ~0.5, retarder 0.02~0.05, rubber powder 0.2~0.5, waterproofing agent 0.1~0.3 and slump retaining agent 0.1~0.2 form.

Further, the ballast grain sizes are 10~30mm continuous grading rubble, and rubble grain shape is close to spherical shape, parent rock pressure resistance Degree is in 120MPa or more.

Meanwhile the present invention also provides a kind of stake holes casting method using above-mentioned C50 or more underwater concrete, including it is following Step:

(1) first stake holes is dug, and removes a bottom slurry；

(2) steel reinforcement cage is fixedly mounted in stake holes；

(3) rigid conduit is inserted into stake holes bottom；

(4) rubble is inserted to stake holes, filled up subject to stake holes；

(5) cementitious material slurry is poured into rigid conduit, 5 meters of promotion rigid conduits of every perfusion are primary, promote rigidity and lead 4.0~5.0m of pipe height；

(6) when there is cementitious material slurry spilling on stake holes surface, illustrate that stake holes has been filled, propose rigid conduit at this time, Complete pouring for stake holes.

In the above method, when pouring into cementitious material slurry, need to make the water in stake holes to remain stationary water, in stake holes When water is circulating water, needs to add in cementitious material slurry and do not disperse rubber cement under water.

In the above method, before pouring into cementitious material slurry, cementitious material slurry, mixing speed are stirred using high-speed mixer In 1200r/min or more, mixing time is 120~360s.

Due to the adoption of the above technical scheme, the present invention has the advantages that the present invention is underwater using cementitious material slurry Anti- dispersibility is apparently higher than the principle of mortar and concrete, and cementitious material slurry and rubble are separately poured, and utilizes big flowing Cementitious material slurry is squeezed the moisture in rubble gap and is filled in rubble, to improve the density of concrete.

Detailed description of the invention

Fig. 1 is the structural schematic diagram before stake holes of the present invention pours；

Fig. 2 is the structural schematic diagram when present invention promotes rigid conduit；

Fig. 3 is structural schematic diagram when stake holes of the present invention pours completion.

Description of symbols: 1- stake holes；2- steel reinforcement cage；3- rubble；4- rigid conduit；5- cementitious material slurry.

Specific embodiment

To make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and examples to this hair It is bright to be described in further detail.

The embodiment of the present invention: a kind of C50 or more underwater concrete of the invention, the concrete by cementitious material slurry and Rubble composition, the cementitious material slurry is by cementitious material, aqueous epoxy resins and self-emulsifying curing agent, water and additive Composition, wherein cementitious material is made of cement and superfine powder.The cementitious material is by weight at last by cement 80 and super Fine powder 20 forms, and the cementitious material slurry is consolidated by cementitious material 70 with aqueous epoxy resins and self-emulsifying at last by weight Agent 3, water 25 and additive 1.5 form.In the present embodiment, the cement uses portland cement, if encountering emergency repair The quick-hardening cements such as aluminium sulfate, aluminate also can be selected in engineering.The superfine powder be silicon powder, superfined flyash, ultra-fine phosphorus slag powder, One or more of ultrafine slag powder or nanometer grade calcium carbonate powder.The additive is by weight at last by High-efficiency polycarboxylic acid Water-reducing agent 0.8, cellulose ether 0.3, retarder 0.03, rubber powder 0.3, waterproofing agent 0.2 and slump retaining agent 0.15 form.The rubble Partial size is 20mm continuous grading rubble, and rubble grain shape is close to spherical shape, and parent rock compression strength is in 120MPa or more.Ballast grain sizes it is big Small related with the aperture of stake holes, the aperture of stake holes is bigger, then the ballast grain sizes selected are also bigger.

Referring to Fig. 1~3, the present invention also provides a kind of stake holes casting method using above-mentioned C50 or more underwater concrete, packets Include following steps:

(1) first stake holes 1 is dug, and removes a bottom slurry；

(2) steel reinforcement cage 2 is fixedly mounted in stake holes 1；

(3) rigid conduit 4 is inserted into 1 bottom of stake holes；

(4) rubble 3 is inserted to stake holes 1, filled up subject to stake holes 1；

(5) before pouring into cementitious material slurry 5, cementitious material slurry 5 is stirred using high-speed mixer, mixing speed is Then 1250r/min, mixing time 300s pour into the cementitious material slurry 5 being stirred in rigid conduit 4, every 5 meters of perfusion Promote rigid conduit 4 once, the height for promoting rigid conduit 4 is 4.5m；When pouring into cementitious material slurry 5, need to make in stake holes 1 Water remain stationary water, as the water in stake holes 1 be circulating water when, need to add in cementitious material slurry 5 and not disperse under water Rubber cement；

(6) when there is the spilling of cementitious material slurry 5 on 1 surface of stake holes, illustrate that stake holes has been filled, propose rigid conduit at this time 4, complete pouring for stake holes 1.

Claims (10)

1. a kind of C50 or more underwater concrete, it is characterised in that: the concrete is made of cementitious material slurry and rubble, described Cementitious material slurry be made of cementitious material, aqueous epoxy resins and self-emulsifying curing agent, water and additive, wherein being gelled Material is made of cement and superfine powder.

2. C50 or more underwater concrete according to claim 1, it is characterised in that: the cementitious material is by weight It is made of at last cement 70~90 and superfine powder 10~30.

3. C50 or more underwater concrete according to claim 1, it is characterised in that: the cementitious material slurry is by weight It is by cementitious material 60~80 and aqueous epoxy resins and self-emulsifying curing agent 2~5, water 18~35 and additive 1 that part, which calculates, ~2 compositions.

4. C50 or more underwater concrete according to claim 1, it is characterised in that: the cement is portland cement, aluminium One or more of acid salt cement or sulphate aluminium cement.

5. C50 or more underwater concrete according to claim 1, it is characterised in that: the superfine powder is silicon powder, superfine powder One or more of coal ash, ultra-fine phosphorus slag powder, ultrafine slag powder or nanometer grade calcium carbonate powder.

6. C50 or more underwater concrete according to claim 1, it is characterised in that: the additive calculates by weight Be by high-efficiency polycarboxylic acid water reducer 0.5~1.0, cellulose ether 0.2~0.5, retarder 0.02~0.05, rubber powder 0.2~0.5, Waterproofing agent 0.1~0.3 and slump retaining agent 0.1~0.2 form.

7. C50 or more underwater concrete according to claim 1 and its casting method, it is characterised in that: the rubble grain Diameter is 10~30mm continuous grading rubble, and rubble grain shape is close to spherical shape, and parent rock compression strength is in 120MPa or more.

8. a kind of stake holes casting method using any one of claim 1~7 C50 or more the underwater concrete, feature exist In the following steps are included:

(1) first stake holes is dug, and removes a bottom slurry；

(2) steel reinforcement cage is fixedly mounted in stake holes；

(3) rigid conduit is inserted into stake holes bottom；

(4) rubble is inserted to stake holes, filled up subject to stake holes；

(5) cementitious material slurry is poured into rigid conduit, 5 meters of promotion rigid conduits of every perfusion are primary, and it is high to promote rigid conduit Spend 4.0~5.0m；

(6) when there is cementitious material slurry spilling on stake holes surface, illustrate that stake holes has been filled, propose rigid conduit at this time, complete Stake holes pours.

9. the stake holes casting method according to claim 8 using C50 or more underwater concrete, it is characterised in that: pour into When cementitious material slurry, need to make the water in stake holes to remain stationary water, as the water in stake holes be circulating water when, need be gelled It is added in material slurry and does not disperse rubber cement under water.

10. the stake holes casting method according to claim 8 using C50 or more underwater concrete, it is characterised in that: pour into Before cementitious material slurry, cementitious material slurry is stirred using high-speed mixer, mixing speed is in 1200r/min or more, stirring Between be 120~360s.