CN100453744C

CN100453744C - Underwater compact concrete construction method

Info

Publication number: CN100453744C
Application number: CNB2005101016614A
Authority: CN
Inventors: 郑雄
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-11-17
Filing date: 2005-11-17
Publication date: 2009-01-21
Anticipated expiration: 2025-11-17
Also published as: CN1776116A

Abstract

The present invention relates to an underwater compact concrete construction method which comprises steps that retaining wall protection by using mud, hole forming and hole cleaning are carried out to underwater engineering to be constructed; a conduit pipe is sunk in a position poured with concrete; the concrete pouring is carried out by the conduit pipe, the pouring speed of the concrete is mainly matched with the lifting speed of the conduit pipe in the pouring process, and the conduit pipe can not disengage from a concrete surface. The present invention is characterized in that when a last section of the conduit pipe is remained, the concrete is inserted into the middle part or the bottom of a pile from the conduit pipe by a vibrating rod or a vibrator, and then the concrete is evenly and vertically vibrated. The construction method better ensures the construction quality of the underwater concrete.

Description

The job practices of underwater compact concrete

[technical field]

Fa Benming relates to the job practices of concrete compaction in the submerged structure engineering.

[background technology]

Diaphragm wall for many years, dash, underwater concrete such as drilled pile closely knit, the one, undertaken by the concrete self compaction closely knit, the 2nd, carry out closely knit for several times by the tremie oscilaltion.

Lower in the concrete grade of using, ultrasonic wave, a peephole view of often loosing core by concrete under the not really advanced situation of detection means such as small strain is confirmed the compactness of underwater concrete, the accuracy of this detection method is reliable inadequately.

Nowadays concrete grade is used higher and higher, and detection means is also improving.By detecting, even well-done construction corps, underwater concrete problem rate is also between 10～30%, and is still not ideal enough.

[summary of the invention]

The objective of the invention is to provide a kind of job practices of underwater compact concrete, to improve the construction quality of underwater concrete for underwater concrete construction.

The object of the present invention is achieved like this: the Underwater Engineering that construct is adopted mud off, pore-forming, clear hole; Sink to conduit at the position of wanting concreting; Carry out concreting by described conduit, build and note in the process hoisting velocity of concreting speed and described conduit is complementary, guarantee that described conduit does not break away from concrete surface; When residue final section described conduit, vibrating head or vibrator are inserted from described conduit in the concrete bottom stake middle part or the stake, then concrete is evenly vertically vibrated.

As the further improvement of the job practices of underwater compact concrete of the present invention, when the engineering cross section is big, adopt a plurality of described vibrating heads or vibrator to vibrate simultaneously.

As the further improvement of the job practices of underwater compact concrete of the present invention, when being less than or equal to 12 meters, the concreting degree of depth adopts described vibrating head.

Compared with prior art, the job practices of underwater compact concrete of the present invention comprises following characterization step: when the described conduit of residue final section, from described conduit, insert in the concrete to the stake middle part vibrating head or vibrator or the stake bottom, then concrete is evenly vertically vibrated.By this characterization step, the use label of underwater concrete is improved, the concrete laitance amount of moderate reduction underwater concrete end face and height make the construction quality of underwater concrete become reliable.

[description of drawings]

Fig. 1 is to use single vibrating head to insert the schematic diagram that underwater concrete is vibrated from conduit.

Fig. 2 is to use single vibrator to insert the schematic diagram that underwater concrete is vibrated from conduit.

Fig. 3 is the vibrate layout schematic diagrames of heavy in section underwater concrete of a plurality of vibrators.

Fig. 4 is to use the many vibrating heads concrete vertical cross section schematic diagram in heavy in section under water that vibrates.

Fig. 5 is to use a plurality of vibrators concrete vertical cross section schematic diagram in heavy in section under water that vibrates.

[specific embodiment]

The invention provides a kind of job practices of underwater compact concrete, its theoretical foundation is: when concreting under water, concrete one rushes down and descends from the hopper on conduit top, mud in the row's of squeezing conduit, concrete behind the conduit outlet rapidly around the row's of squeezing conduit mud and around the conduit near return concrete and surround packing and live conduit mouth, this just makes concrete shutoff that near the mud the catheter segment may be returned rapidly by conduit.Continue in the process of building concrete, conduit up and down reciprocatingly both may be taken part mud out of, also may bring part mud into.Vibrating load is arranged when building, and the unsettled soil layer in top down can shake.Because soil layer proportion is greater than mud, and washes out from top and to get off to have certain kinetic energy also might pour the layer of concrete, form interlayer Here it is so-called undergauge or broken pile.

If there is not above rough sledding, it is very favourable that underwater concrete is vibrated.If certain above situation is arranged, the effect of vibrating has following several possibility:

1, no problem part concrete can be more closely knit.

2, the concrete that contains the mud part is because vibration source shakes from lower to upper, and mud can be extruded by the mortar in the concrete, and is showy from bottom to top to the underwater concrete end face along the vibrating channel of vibration source.

The underwater concrete that 3, native interlayer is arranged, wherein the soil layer part can be softened, this softening can quickening during vibration.Vibration makes the stone in the concrete clamp-on softening part, reduces native interlayer, changes the formation of this part, improves the bearing capacity of native interlayer, reduces the compress variation of native interlayer.But crowded thus ooze of discharging or mud have certain pollution to the concrete on vibration source top, and the total bearing capacity in its top is had a small amount of negative effect.But because concrete bearing capacity is not the maximum decision, but the weakest point decision.The bearing capacity that has improved the weakest point has just done concrete bearing capacity high, thereby vibration also can be described as very effective to solving problematic underwater concrete.

The objective of the invention is to realize by following technical solution: according to the depth bounds and the keypoint part of the underwater concrete of determining, vibration source that selection is complementary and vibration transfer mode drop to definite vibration position to vibration source by underwater concrete conduit safety.Promote (speed is fixed according to circumstances) from the bottom up while vibrating, till the underwater concrete top shakes well.

The present invention and existing underwater concrete self-compaction technology have compared one deck safety assurance many.The use label of underwater concrete is improved, and the concrete laitance amount of moderate reduction underwater concrete end face and height make the construction quality of underwater concrete become reliable.

The present invention is described in further detail below in conjunction with accompanying drawing.

The depth bounds of the underwater concrete that definite need vibrate and keypoint part are selected the vibration source and the vibration transfer mode that are complementary.Concrete liquidates, holes, so long as strict with operational procedure when concreting, because the stressed maximum of top concrete and compactness is less than normal, as be used for the room and build, just much of that basically with 10～12 meters long vibrating heads 3, and be used for bridge just should be prudent.

If the degree of depth that requires to vibrate surpasses 12 meters, will slip in the concrete with the vibrator 4 that is connected with power cable and conductor rope 5 and vibrate.

If the scope that need vibrate is too big, vibrator 4 not enough words just should corresponding increase vibrator 4.Only vertical up-down vibration does not move on level on the arrangement principle.

To different types of underwater concrete engineering its to require emphasis be different.Particularly crucial as the Xin Qiang in the diaphragm wall and old wall seam crossing, the seam processing is bad will seepage, thereby closely knit emphasis is at the concrete vibrating of seam.And pile concrete mainly is compactness and bearing capacity problem, and its keypoint part should be never to play above concrete part near the steady soil bottom.

When carrying out the construction of stake 1, at first use is dashed, rig is shaped a hole under water, sinks to reinforcing cage and sinks to conduit 2 behind pore-forming, the clear hole; Carry out concreting by conduit 2, build and note in the process hoisting velocity of concreting speed and conduit 2 is complementary, guarantee that conduit 2 does not break away from concrete surface; When residue final section conduit 2, vibrating head 3 or vibrator 4 are inserted from conduit 2 in the concrete until stake 1 bottom (can insert if desired 1 any position, centre), then concrete is evenly vertically vibrated.In after should first limit on the orientation when a plurality of vibrator 4 levels are vibrated, vertically answer before the limit in back (just the limit is high, normal, basic).A vertical lifting in principle when vibrating should not move horizontally, and this helps mortar, mud normally by vertical motion passage come-up, reduces the negative effect of mud scum laitance.

In work progress, be also noted that following safety problem:

Escape way in the time of at first when making reinforcing cage under water, will having laid vibrator 4 and move up and down, and mark.

Secondly can only water the conduit 2 that discharges at concrete in principle during concrete gone under water by vibrator 4 and also not transfer in the underwater concrete, vibrator 4 inserts from conduit 2.The position of vibrating that the vibration limit is sunk in the concrete and reached setting is opened on the limit if desired, if a vibrator 4 is not enough, need when same conduit 2 inserts, to note controlling well its order successively, horizontal arrangement position, power source and vibrator separate key elements such as safety with vibrator.Conduit 2, the position of the good vibrator 4 of horizontal location are transferred in down good vibrator 4 backs.

Note Electrical Safety and operator handling safety once more.

Claims

1, a kind of job practices of underwater compact concrete, it comprises following construction sequence: mud off, pore-forming, clear hole are carried out in the snag hole that construct; In wanting the stake hole of concreting, sink to conduit; Carry out concreting by described conduit, build and note in the process hoisting velocity of concreting speed and conduit is complementary, guarantee that described conduit does not break away from concrete surface, it is characterized in that, when the described conduit of residue final section, from described conduit, insert in the concrete to the stake middle part vibrator or the stake bottom, promote vibrator from the bottom up while vibrate, to realize that concrete is carried out even vertical vibrating.

2, the job practices of underwater compact concrete as claimed in claim 1 is characterized in that, adopts a plurality of described vibrators to vibrate simultaneously when the stake cross section is big.

3, the job practices of underwater compact concrete as claimed in claim 1 is characterized in that, the vibrator that is adopted that vibrates when the fluid concrete degree of depth is less than or equal to 12 meters is a vibrating head.