CN104963364A - Disposing method for topdown structural slab lower side wall construction joint - Google Patents
Disposing method for topdown structural slab lower side wall construction joint Download PDFInfo
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- CN104963364A CN104963364A CN201510429850.8A CN201510429850A CN104963364A CN 104963364 A CN104963364 A CN 104963364A CN 201510429850 A CN201510429850 A CN 201510429850A CN 104963364 A CN104963364 A CN 104963364A
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Abstract
The invention discloses a disposing method for a topdown structural slab lower side wall construction joint. The structural slab lower side wall construction joint is a horizontal construction joint reserved between a structural side wall and an underground side wall. The disposing method for the construction joint includes the treatment steps that firstly, when a structural top plate is constructed, a structural side wall pouring guide pipe is embedded; secondly, concrete is poured on the structural top plate and part of the structural side wall; thirdly, concrete construction is conducted on a lower structure; fourthly, the underground side wall is constructed; fifthly, underground side wall concrete is poured to the position away from the construction joint by 2 m, and pouring of the construction joint is conducted finally through the embedded structural side wall pouring guide pipe. The disposing method has the advantages that after concrete pouring of the construction joint is conducted, the construction joint is filled with concrete compactly without a gap, the appearance does not need to be repaired, a straight joint trace does not exist, and the defect of the potential quality hazard of leakage of the construction joint is overcome; the disposing method is suitable for improving the construction quality of structural components of topdown construction and more suitable for practical operation, and the effect of risk avoidance is achieved from the angle of safety production.
Description
Technical field
The present invention relates to a kind of processing method of sheltered reverse excavation structural slab lower side wall constuction joint, belong to construction engineering technical field.
Background technology
Along with the development in epoch, want space to become already to underground important means that inner city diversification construction cracks a development space bottleneck difficult problem.How to guarantee to construct the impact of built down town downtown roads and periphery using function and structural safety are down to minimum while, accelerating construction progress, to meet the demand of social development, sheltered reverse excavation construction becomes the effective ways of city track traffic engineering and some high level, high-rise multi-storey basement and other multi-layer underground structure constructions step by step.
Sheltered reverse excavation is the Construction of Deep Excavation Engineering technique that a kind of underground structure is successively constructed from top to bottom.In sheltered reverse excavation work progress, the structural slab lower side wall constuction joint produced, it is the product of sheltered reverse excavation working procedure, namely, first the construction of structure roof is carried out, a segment structure side wall must be performed during top board construction, then the construction of lower part is carried out, after structure base slab has performed, must by lower floor to upper strata along doing structure side wall, in order to be distinguished with the structure side wall of constructing together with top board, it is called ground lower side wall, although both are underground structure side walls, the time of construction is different, so just can produce this road constuction joint.Constuction joint in fact just only a kind of in work progress because of not working continuously, when also not allowing to cut off, stay at the position of specification permission and establish constuction joint.All need double cautious to its process.The processing method of Specific construction seam is also regulation and stipulation, such as rubs hair with the hands, cleans up, with label mortar bed etc.But above-mentioned construction joint processing method, the concrete density that its constuction joint is built is poor, there is comparatively serious seepage hidden danger of quality.
How to solve the seepage hidden danger of quality of sheltered reverse excavation structural slab lower side wall constuction joint, becoming the problem that building industry engineers and technicians extremely pay close attention to, is also the problem that construction engineering technician urgently studies and solves.
In the last few years, building industry engineers and technicians had done a large amount of research and developments to construction joint processing method, and were disclosed by following patent document:
Chinese invention patent manual application publication number CN102561402A (on 07 11st, 2012 Shen Qing Publication day) " processing method of formula underground civil defense engineering top board and wall constuction joint built by sheltered reverse excavation list ", it comprises the following steps:
Top board construction step, top board of first constructing, the constuction joint of itself and side wall is left to the side wall being down not less than 50cm from top board bottom surface, slope higher than outside inside constuction joint profit retention; Insert the irrigation hole of building side wall concrete from ground at top board and side wall junction again, employing steel pipe as irrigation hole is, spacing 1 ~ 1.5 meter, steel tube wall penetration position welding steel seal ring, and steel pipe two ends temporary plugging, is positioned at the highest point of slope bottom steel pipe;
Constuction joint surface treatment step, dabbing process is carried out on constuction joint surface, adopts pneumatic pick to dig out white raft, and the elongated water-swellable bar that Grouting Pipe is set, reinforcing bar adopts wire brushing clean;
Constuction joint is with lower side wall construction sequence, and side wall construction height is to distance constuction joint 0.5-1 rice; Concrete construction step, first carry out side wall concrete to build, within 7th, adopt the dry expansive concrete of building the high grade of concrete strength used than basement afterwards, constuction joint is built, send into from reserved irrigation hole, adopt small-sized vibrating spear to vibrate from the tubaeform mouth in wall side, concrete casting stops pouring to overflowing horn mouth, and irrigation hole also must fill with real with concrete in addition;
Pressure grouting step: after concrete strength reaches design strength, carries out pressure grouting to the water-swellable bar of band Grouting Pipe, eliminates the gap at constuction joint place.
In described top board construction step, outward-dipping 15 degree of described slope.In described concrete construction step, the concrete that described horn mouth waters more cuts after its intensity reaches 75%.
The advantage of the method: the closely knit tight of constuction joint position Concrete Filled can be ensured.
Its Shortcomings part: present stage, underground structure side wall thicknesses was all between 800 ~ 1200mm, according to the construction technology of sheltered reverse excavation, the method of above-mentioned " horn mouth " is adopted to construct to the construct node processing of reserved structure side wall constuction joint of top plate, this construction method concreting side wall also exists quality blind area to constuction joint position, top, the concrete construction quality of side wall constuction joint upstream face cannot be ensured, and the concrete process to " horn mouth ", manually, material all also exists waste, both uneconomical also not environmentally, secondary sand finish process is simultaneously in quality, obviously not good enough compared with shaping with one-time-concreting in perception.Moreover, " horn mouth ", all at top board haunch lower side wall constuction joint place, due to the building structure feature of underground construction large span, high headroom, needs to set up scaffold and carries out high-rise working construction, there is larger potential safety hazard, also cause the delayed of duration progress simultaneously.
Summary of the invention
Object of the present invention, is to overcome the above-mentioned weak point of prior art, provides the processing method of a kind of sheltered reverse excavation structural slab lower side wall constuction joint that there is seepage hidden danger of quality after overcoming structural slab lower side wall treatment of construction joints.
For realizing object of the present invention, the technical scheme adopted is:
1, a kind of processing method of sheltered reverse excavation structural slab lower side wall constuction joint, it is characterized in that: described structural slab lower side wall constuction joint, for being retained in the horizontal construction joint between structure side wall and ground lower side wall, the treatment step of the processing method of constuction joint comprises: 1) during constructing structure top board, and pre-buried underground structure side wall builds conduit; 2) pouring structure top board and part-structure side wall concrete; 3) substructure concrete construction is carried out; 4) along doing ground lower side wall and 5) underground side wall concrete builds to from constuction joint 2m place, builds conduit finally build constuction joint by pre-buried structure side wall; Concrete operations are as follows:
1) during constructing structure top board, pre-buried structure side wall builds conduit
Arranging a diameter along structure side wall genesis analysis direction at interval of 2.5m place is that the pre-buried structure side wall of 400mm builds conduit, and run through structure roof to the constuction joint position between structure side wall and ground lower side wall, and build on conduit at concrete embedded structure side wall sealing steel loop and built-in slip casting pipe are set;
2) pouring structure top board and part-structure side wall concrete
Carry out the concrete pouring construction of the structure side wall of the oblique haunch of structure roof and lower 500 ~ 800mm thereof;
3) substructure concrete construction is carried out
Reach after designing requirement until concrete strength, carry out the covered back-digging construction of substructure;
4) along doing ground lower side wall
Construction is to structure base slab, and construction is from the bottom to top along doing ground lower side wall;
5) underground side wall concrete is built to from constuction joint 2m place, builds conduit finally build constuction joint place concrete by pre-buried structure side wall
The concreting of ground lower side wall is to the 2m place from constuction joint, build conduit by pre-buried structure side wall and carry out finally building of ground lower side wall, and before side wall concrete formwork for placing matched moulds, the waterproofing work of the constuction joint between structure side wall and ground lower side wall is carried out according to designing requirement, reach after design strength until concrete strength, carry out slip casing by pressure process by built-in slip casting pipe, guarantee structure side wall and ground lower side wall between constuction joint and structure side wall and ground lower side wall and diaphragm wall between Concrete Filled closely knit.
Described sealing steel loop, it is of a size of external diameter 800mm, internal diameter 400mm, and thickness is 2mm.
The waterproofing work of described constuction joint is the dabbing process of pre-buried concrete joint, built-in slip casting pipe brushing expansion water-stop glue and cement-base infiltration crystallization material.
Beneficial effect of the present invention
Compared with prior art, beneficial effect of the present invention:
1, after constuction joint concreting, the closely knit tight of its position Concrete Filled, outward appearance does not need to repair, without straight joint vestige, the drawback that the seepage hidden danger of quality solving constuction joint exists.
2, be applicable to the raising of the structural element construction quality of sheltered reverse excavation construction, be more suitable for practical operation, from the angle of safety in production, reach the effect of risk averse.
3, the concrete pouring construction scope of operation is in structure roof, the setting up of the material of " horn mouth " concrete, the process of secondary mortar surface layer and construction scaffolding, " horn mouth " be concrete to be picked cutter, surface layer process, artificial, the machinery of concrete cleaning transport and the lease etc. of scaffold and drops into and can be saved, and also reaches the effect of environmental protection while saving the duration.Meanwhile, avoid high-rise working, accomplish the risk averse in execution control.
Accompanying drawing explanation
Fig. 1 is the flow chart of steps of the inventive method;
Fig. 2 is pre-buried concreting conduit schematic diagram;
Fig. 3 is for build tremie placing side wall schematic diagram by pre-buried structure side wall;
Fig. 4 adopts pre-buried body of wall entity photo of building cover pipe construction;
Fig. 5 is for adopting the body of wall entity photo of " horn mouth " method construction.
In Fig. 2: 1 sealing steel loop; 2 structure roof; The oblique haunch of 3 concrete roof; 4 built-in slip casting pipes; 5 constuction joints; 6 structure side walls; 7 diaphragm walls; 8 pre-buried structure side walls build conduit.
In Fig. 3: 1 sealing steel loop; 2 structure roof; The oblique haunch of 3 concrete roof; 4 built-in slip casting pipes; 5 constuction joints; 6 structure side walls; 7 diaphragm walls; 8 pre-buried structure side walls build conduit; 9 side wall concrete formwork for placing; 10 ground lower side walls.
In Fig. 4: 11 adopt the inventive method process structure side wall 6 to spread and sink in the nothing at lower side wall 10 constuction joint 5 place, ground oozes, and the fine actual effect of apparent mass.
In Fig. 5: 12 adopt the constuction joint mend vestige between the structure side wall of " horn mouth " construction technology and ground lower side wall obvious, and there is the hidden danger of quality actual state of seepage.
Detailed description of the invention
In order to make those skilled in the art understand technical scheme of the present invention better, below in conjunction with accompanying drawing and most preferred embodiment, the present invention is described in further detail.
Embodiment
A kind of processing method of sheltered reverse excavation structural slab lower side wall constuction joint, described structural slab lower side wall constuction joint, as shown in Figure 3, for being retained in the horizontal construction joint 5 between structure side wall 6 and ground lower side wall 10, the treatment step of the processing method of constuction joint 5, as shown in Figure 1: 1) during constructing structure top board, pre-buried underground structure side wall builds conduit; 2) pouring structure top board and part-structure side wall concrete; 3) substructure concrete construction is carried out; 4) along doing ground lower side wall and 5) underground side wall concrete builds to from constuction joint 2m place, builds conduit finally build constuction joint by pre-buried structure side wall; Concrete operations are as follows:
1) during constructing structure top board, pre-buried structure side wall builds conduit
Arranging a diameter along structure side wall 6 genesis analysis direction at interval of 2.5m place is that the pre-buried structure side wall of 400mm builds conduit 8, and constuction joint 5 position run through between structure roof 2 to structure side wall 6 and ground lower side wall 10, and build on conduit 8 at concrete embedded structure side wall sealing steel loop 1 and built-in slip casting pipe 4 are set, as shown in Figure 3;
2) pouring structure top board and part-structure side wall concrete
Carry out the concrete pouring construction of the structure side wall 6 of the oblique haunch 3 of structure roof 2 concrete roof and lower 500 ~ 800mm thereof, as shown in Figure 2;
3) substructure concrete construction is carried out
Reach after designing requirement until concrete strength, carry out the covered back-digging construction of substructure;
4) along doing ground lower side wall
Construction is to structure base slab, and construction is from the bottom to top suitable does ground lower side wall 10, as shown in Figure 3;
5) underground side wall concrete is built to from constuction joint 2m place, builds conduit finally build constuction joint place concrete by pre-buried structure side wall
As shown in Figure 3, the concreting of ground lower side wall 10 is to the 2m place from constuction joint 5, build conduit 8 by pre-buried structure side wall and carry out finally building of ground lower side wall 10, and before side wall concrete formwork for placing 9 matched moulds, the waterproofing work of the constuction joint 5 between structure side wall 6 and ground lower side wall 10 is carried out according to designing requirement, reach after design strength until concrete strength, slip casing by pressure process is carried out by built-in slip casting pipe 4, guarantee structure side wall 6 and ground lower side wall 10 between constuction joint 5 and structure side wall 6 and ground lower side wall 10 and diaphragm wall 7 between Concrete Filled closely knit.
Described sealing steel loop 1, it is of a size of external diameter 800mm, internal diameter 400mm, and thickness is 2mm.
The waterproofing work of described constuction joint 5 is the dabbing process of pre-buried concrete joint, built-in slip casting pipe 4 brushing expansion water-stop glue and cement-base infiltration crystallization material.
In the present invention, pre-buried body of wall entity photo of building cover pipe construction is adopted, as shown in Figure 4.
In prior art, adopt the body of wall entity photo of " horn mouth " method construction, as shown in Figure 5.
Make a general survey of Fig. 4 and Fig. 5, the effect of both methods, is respectively:
Adopt the inventive method: 11 is constuction joint 5 place between structure side wall 6 and ground lower side wall 10, ooze, and apparent mass is fine without spreading and sinking in.
In prior art, 12 is adopt the constuction joint mend vestige between the structure side wall of " horn mouth " construction technology and ground lower side wall obvious, and there is the hidden danger of quality of seepage.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from design concept of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (3)
1. the processing method of a sheltered reverse excavation structural slab lower side wall constuction joint, it is characterized in that: described structural slab lower side wall constuction joint, for being retained in the horizontal construction joint (5) between structure side wall (6) and ground lower side wall (10), the treatment step of the processing method of constuction joint (5) comprising: 1) during constructing structure top board, and pre-buried underground structure side wall builds conduit; 2) pouring structure top board and part-structure side wall concrete; 3) substructure concrete construction is carried out; 4) along doing ground lower side wall and 5) underground side wall concrete builds to from constuction joint 2m place, builds conduit finally build constuction joint by pre-buried structure side wall;
Concrete operations are as follows:
1) during constructing structure top board, pre-buried structure side wall builds conduit
Arranging a diameter along structure side wall (6) genesis analysis direction at interval of 2.5m place is that the pre-buried structure side wall of 400mm builds conduit (8), and run through structure roof (2) to constuction joint (5) position between structure side wall (6) and ground lower side wall (10), and build on conduit (8) at concrete embedded structure side wall sealing steel loop (1) and built-in slip casting pipe (4) are set;
2) pouring structure top board and part-structure side wall concrete
Carry out the concrete pouring construction of the structure side wall (6) of the oblique haunch (3) of structure roof (2) and lower 500 ~ 800mm thereof;
3) substructure concrete construction is carried out
Reach after designing requirement until concrete strength, carry out the covered back-digging construction of substructure;
4) along doing ground lower side wall
Construction is to structure base slab, and construction is from the bottom to top along doing ground lower side wall (10);
5) underground side wall concrete is built to from constuction joint 2m place, builds conduit finally build constuction joint place concrete by pre-buried structure side wall
The concreting on ground lower side wall (10) is to the 2m place from constuction joint (5), build conduit (8) by pre-buried structure side wall and carry out finally building of ground lower side wall (10), and before side wall concrete formwork for placing (9) matched moulds, the waterproofing work of the constuction joint (5) between structure side wall (6) and ground lower side wall (10) is carried out according to designing requirement, reach after design strength until concrete strength, slip casing by pressure process is carried out by built-in slip casting pipe (4), guarantee constuction joint (5) between structure side wall (6) and ground lower side wall (10) and structure side wall (6) and the Concrete Filled between lower side wall (10) and diaphragm wall (7) closely knit.
2. the processing method of sheltered reverse excavation structural slab lower side wall constuction joint according to claim 1, it is characterized in that: described sealing steel loop (1), it is of a size of external diameter 800mm, internal diameter 400mm, and thickness is 2mm.
3. the processing method of sheltered reverse excavation structural slab lower side wall constuction joint according to claim 1, it is characterized in that: the waterproofing work of described constuction joint (5), for the dabbing process of pre-buried concrete joint, built-in slip casting pipe (4) brushing expansion water-stop glue and cement-base infiltration crystallization material.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106013197A (en) * | 2016-05-27 | 2016-10-12 | 中天建设集团有限公司 | Pre-grouting water stopping method for connecting part between diaphragm wall and bottom board |
| CN107288141A (en) * | 2017-08-10 | 2017-10-24 | 江苏光跃节能科技有限责任公司 | A kind of contrary sequence method seamless flexible water construction technology |
| CN110159272A (en) * | 2019-05-22 | 2019-08-23 | 河南省交通规划设计研究院股份有限公司 | The construction method of large span city tunnel with box top board structure |
-
2015
- 2015-07-21 CN CN201510429850.8A patent/CN104963364A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106013197A (en) * | 2016-05-27 | 2016-10-12 | 中天建设集团有限公司 | Pre-grouting water stopping method for connecting part between diaphragm wall and bottom board |
| CN107288141A (en) * | 2017-08-10 | 2017-10-24 | 江苏光跃节能科技有限责任公司 | A kind of contrary sequence method seamless flexible water construction technology |
| CN107288141B (en) * | 2017-08-10 | 2019-06-07 | 江苏光跃节能科技有限责任公司 | A kind of seamless flexible water construction technology of contrary sequence method |
| CN110159272A (en) * | 2019-05-22 | 2019-08-23 | 河南省交通规划设计研究院股份有限公司 | The construction method of large span city tunnel with box top board structure |
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