CN105002913A - Strongly-permeable stratum deep foundation pit bottom sealing water stopping structure and construction method thereof - Google Patents
Strongly-permeable stratum deep foundation pit bottom sealing water stopping structure and construction method thereof Download PDFInfo
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Abstract
The invention discloses a strongly-permeable stratum deep foundation pit bottom sealing water stopping structure, which comprises diaphragm walls, underwater plain concrete boards, reinforced concrete partition walls, uplift piles and inner supports, wherein the diaphragm walls are arranged around the foundation pit througgh casting; the inner supports support the diaphragm walls; the reinforced concrete partition walls are formed on the foundation pit below the diaphragm walls through casting; the reinforced concrete partition walls and the diaphragm walls of each two faces form a casting block in a surrounding mode on the foundation base; the uplift piles are casted on the foundation base inside the block; each underwater plain concrete board is formed through casting at each block opening formed by the reinforced concrete partition walls and the diaphragm walls in a surrounding mode; and the uplift piles are firmly embedded in the underwater plain concrete boards. The underwater plain concrete boards enhance overall strength and ridigity of the foundation pit bottom, dual effects of reinforced pit bottom and permeation prevention are provided, influences on stability of the pit bottom by high pressure water and raised pit bottom caused by excavation of the foundation pit can be effectively solved, and lateral displacement of the pit wall and settlement deformation of the surrounding enviornment can be well reduced.
Description
Technical field
The present invention relates to highly permeable ground layer depth base construction field, particularly, relate to a kind of highly permeable stratum deep foundation ditch back cover water-stopping structure and construction method thereof.
Background technology
At present, the outer precipitation in hole, curtain vertical partition wall, the full slip casting back cover of substrate three kinds of methods are usually adopted to solve the engineering problem that artesian water causes in deep-foundation pit engineering.
Precipitation method outside the first hole as described in Figure 1, the mentality of designing of the method is: adopt diaphragm wall as space enclosing structure, first carry out cheating the construction of inside and outside dewatering confined water after space enclosing structure is carried out, drop to the absolute altitude of designing requirement at artesian water head after, carry out excavation.
The shortcoming of the method is, precipitation unavoidably causes the sedimentation of foundation ditch surrounding enviroment and relative settlement, especially the very deficient regional engineering of water resource and the engineering higher to sedimentation and deformation requirement, and the program is forbidden to adopt; At the sand-pebble layer that artesian head is higher, the water content of artesian aquifer is enriched, Rainfall Influence scope is wide, pump-out is large, the time of dewatering confined water is long, and precipitation expense and difficulty are very high, higher to the power demands at execution control, municipal drainage and scene, during power-off, emergency plan enforcement difficulty is high, and in hole, dewatering well is closed also suitable risk.
The second curtain vertical partition wall method as described in Figure 2, the mentality of designing of the method is: adopt diaphragm wall (or drilled pile, interlocking pile and corresponding diaphragm wall) as space enclosing structure, diaphragm wall inserts the impervious layer certain depth under artesian aquifer, reaches vertical partition wall artesian water object.
The shortcoming of the method is, the degree of depth of diaphragm wall is large, and particularly when artesian aquifer is thicker and buried depth is darker, diaphragm wall inserts deep layer impervious layer, very high to the requirement of construction technology and construction machinery.Diaphragm wall is darker, is more difficult to ensure verticality and the leak tightness of card diaphragm wall, once there is the situation that curtain leaks in digging process, prominent gushing very easily occurs, and consequence is serious, and is difficult to judge breakthrough.
The third substrate full slip casting back cover method as described in Figure 3, the mentality of designing of the method is: adopt diaphragm wall (or drilled pile, interlocking pile and corresponding diaphragm wall) as space enclosing structure, substrate adopts gamut slip casting water proof, utilizes injecting cement paste to conduct oneself with dignity and resists artesian pressure.
The shortcoming of the method is, grouting amount is very large, and particularly when artesian aquifer is thicker and buried depth is darker, slip casting appropriate litigation fees is high.Injecting cement paste is once there be local quality problem, and leaking appears in substrate, and underground water is rushed to rock-soil layer in substrate, and be difficult to judge leakage area after string water, be also difficult to carry out the process of specific aim compensation and grouting, gamut compensation and grouting is then costly, and the duration is slow.
Summary of the invention
The object of the invention is for solving above-mentioned technical problem, a kind of effect and the reliability that improve water proof back cover are provided; Select reasonable rabbet groove construction technology, improve exploitativeness; Improve the operability of monitoring measurement and emergency processing, once find local infiltration, can prominent gush occur before Timeliness coverage seepage place, and have enough buffer time to carry out highly permeable stratum deep foundation ditch back cover water-stopping structure and the construction method thereof of the stronger compensation and grouting process of specific aim.
The present invention's adopted technical scheme that solves the problem is: a kind of highly permeable stratum deep foundation ditch back cover water-stopping structure, comprise diaphragm wall, plain concrete plate under water, steel bar concrete partition wall, uplift pile and inner support, diaphragm wall is arranged on around foundation ditch by building, described inner support is supported on diaphragm wall, below described diaphragm wall, foundation ditch forms steel bar concrete partition wall by building, steel bar concrete partition wall described in every two sides and diaphragm wall are enclosed in substrate and are formed and build storehouse, in storehouse, uplift pile is built in substrate, the each Hatch Opening enclosed at steel bar concrete partition wall and diaphragm wall is by building formation plain concrete plate under water, described uplift pile is mounted under water in plain concrete plate.Plain concrete plate increases hole end bulk strength and rigidity under water, possess the reinforcing of the end, hole and antiseepage double effects, effectively can solve the bottom heave that high artesian causes hole end stability influence and excavation of foundation pit, reduce the sedimentation and deformation of hole wall lateral displacement and surrounding environment simultaneously preferably.
Preferably, the thick macadam of 0.5m laid by described plain concrete plate under water, in described macadam, lay draining blind pipe.Below plain concrete plate and structure base slab, between bed course, the thick macadam of 0.5m is set under water, in macadam, lays draining blind pipe, with the percolating water in point eliminating storehouse, storehouse, ensure the dry operation of construction of bottom plates.
Preferably, described steel bar concrete partition wall is provided with rabbet groove with plain concrete plate junction under water; Described uplift pile is provided with rabbet groove with plain concrete plate junction under water; Described diaphragm wall is provided with rabbet groove with plain concrete plate junction under water.
Preferably, described plain under water concrete plate and interface built-in slip casting pipe between diaphragm wall and steel bar concrete partition wall.Interface built-in slip casting pipe between plain concrete plate and diaphragm wall under water, can compensate slip casting shutoff when there is percolating water at interface in time.
Another technical scheme that the present invention solves the problem adopted is: a kind of highly permeable stratum deep foundation ditch back cover water-stopping structure construction method, comprises the steps:
Step 1, according to artesian water water pressure and the excavation of foundation pit degree of depth, carries out anti-prominent gushing, anti-current soil and anti-piping Stability Checking, determines plain concrete plate thickness, uplift pile arrangement parameter and rabbet groove parameter under water;
Step 2, diaphragm wall, steel bar concrete partition wall and uplift pile is built from ground construction, steel bar concrete partition wall described in every two sides and diaphragm wall are enclosed in substrate and are formed and build storehouse, in storehouse, built uplift pile below substrate, with build steel bar concrete partition wall that plain concrete plate is under water connected, uplift pile and diaphragm wall interface in advance and reserve level to through rabbet groove;
Step 3, layer and section down excavates, and sets up inner support in time, until be excavated to more than underground water position, then sets up one nearest inner support of more than water level;
Step 4, the underwater excavation earthwork, until plain concrete plate bottom surface under water;
Step 5, removes the rabbet groove groove inner stuffing on steel bar concrete partition wall, uplift pile and diaphragm wall under water, then sequence placing plain concrete plate under water;
Step 6, layering is pump drainage underground water down, and sets up platform in time, sets up inner support on the water, until by whole for underground water pump drainage;
Step 7, backfills macadam above plain concrete plate under water, lays draining blind pipe, pump drainage percolating water;
Step 8, apply agent structure from the bottom up, lay waterproofing course, sequentially remove support, top board backfills.
Preferably, described step 2 makes the rabbet groove grinding tool on steel bar concrete partition wall, the horizontal bar steel plate of upper and lower two panels, the vertical bar steel plate of a slice and multiple tracks stiffening rib soldering group is adopted to dress up "] " shaped steel groove, steel tank integral solder is on the main muscle of prefabricated reinforced concrete partition wall, steel tank establishes anchor bar behind, the filler removed under being pre-charged with the Yishui River in steel tank.
Preferably, when described step 2 builds diaphragm wall, leak between cold seam place employing three rotary churning piles between framing or sleeve valve barrel grouting process width, reduce the level difference distortion between framing simultaneously.
Preferably, described step 5 build under water plain concrete plate time, plain concrete plate and interface built-in slip casting pipe between diaphragm wall and steel bar concrete partition wall under water.Interface built-in slip casting pipe between plain concrete plate and diaphragm wall under water, can compensate slip casting shutoff when there is percolating water at interface in time.
To sum up, the invention has the beneficial effects as follows:
1, underwater casting element concrete water proof back cover, in conjunction with uplift pile opposing water pressure at the bottom of the foundation, compare substrate slip casting back cover, reliability is higher, water proof back cover better effects if.
2, between plain concrete plate and diaphragm wall and uplift pile under water, interface arranges the through rabbet groove of multiple tracks level, can increase the shear resistance between interface, can ensure water proof effect again.
3, under water plain concrete plate and diaphragm wall closely cementing, solving diaphragm wall because construction reason does not close and the hole wall seepage problem that causes;
4, interface built-in slip casting pipe between plain concrete plate and diaphragm wall under water, can compensate slip casting shutoff when there is percolating water at interface in time.
5, plain concrete plate increases hole end bulk strength and rigidity under water, possess the reinforcing of the end, hole and antiseepage double effects, effectively can solve the bottom heave that high artesian causes hole end stability influence and excavation of foundation pit, reduce the sedimentation and deformation of hole wall lateral displacement and surrounding environment simultaneously preferably.
6, between bed course, the thick macadam of 0.5m is set below plain concrete plate and structure base slab under water, lays draining blind pipe in macadam, with the percolating water in point eliminating storehouse, storehouse, ensure the dry operation of construction of bottom plates.
In sum, one aspect of the present invention avoid highly permeable stratum thicker darker time diaphragm wall be difficult to the construction difficult problem that penetrates, it also avoid all difficulties that artesian water step-down runs on the other hand.Effectively can control to dash forward and gush risk, reach again raising Passive earth forces, reinforce the object of base pit engineering, while protecting surrounding enviroment preferably, also save construction costs, reduce engineering risk.
Accompanying drawing explanation
Fig. 1 is the structural representation of the outer precipitation method in prior art hole;
Fig. 2 is the structural representation of prior art curtain vertical partition wall method;
Fig. 3 is the structural representation of prior art substrate full slip casting back cover method;
Fig. 4 is the schematic diagram of a kind of highly permeable stratum of the present invention deep foundation ditch back cover water-stopping structure;
Fig. 5 is that in the present invention, plain concrete hardens and closes uplift pile back cover base plane figure structure schematic representation under water;
Fig. 6 is that in the present invention, plain concrete hardens and closes uplift pile back cover substrate vertical section structure schematic diagram under water;
The structural representation of diaphragm wall or steel bar concrete partition wall rabbet groove in Fig. 7 the present invention;
Fig. 8 is the 1-1 sectional structure schematic diagram of Fig. 7;
The structural representation of uplift pile rabbet groove in Fig. 9 the present invention.
Figure 10 is the 1-1 sectional structure schematic diagram of Fig. 9.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment 1
A kind of highly permeable stratum deep foundation ditch back cover water-stopping structure as shown in Figures 4 and 5, comprise diaphragm wall 1, plain concrete plate 2 under water, steel bar concrete partition wall 3, uplift pile 4 and inner support 6, diaphragm wall 1 (being equivalent to water-stop curtain) is arranged on around foundation ditch by building, inner support 6 is supported on diaphragm wall 1, between described diaphragm wall 1, steel bar concrete partition wall 3 is set, steel bar concrete partition wall 3 is formed by construction of diaphragm wall, steel bar concrete partition wall described in every two sides 3 and diaphragm wall 1 are enclosed in substrate and are formed and build storehouse, in storehouse, substrate has been built uplift pile 4, each the building in storehouse enclosed at steel bar concrete partition wall 3 and diaphragm wall 1 builds plain concrete plate 2 under water, plain concrete plate 2 is formed by underwater casting element concrete under water, uplift pile 4 is mounted under water in plain concrete plate 2.
Embodiment 2
A kind of highly permeable stratum deep foundation ditch back cover water-stopping structure as shown in Figures 4 and 5, on the basis of embodiment 1, plain concrete plate 2 is laid the thick macadam 5 of 0.5m under water, lays draining blind pipe in macadam.With the percolating water in point eliminating storehouse, storehouse, ensure the dry operation of construction of bottom plates.
Embodiment 3
A kind of highly permeable stratum deep foundation ditch back cover water-stopping structure as shown in Figures 4 and 5, on the basis of embodiment 1, steel bar concrete partition wall 3 is provided with rabbet groove with plain concrete plate 2 junction under water; Described uplift pile 4 is provided with rabbet groove with plain concrete plate 2 junction under water; Described diaphragm wall 1 is provided with rabbet groove with plain concrete plate 2 junction under water.To increase shear resistance under water between plain concrete plate 2 and other supporting interface and to ensure waterproof effect.
Embodiment 4
A kind of highly permeable stratum deep foundation ditch back cover water-stopping structure as shown in Figures 4 and 5, on the basis of embodiment 1, plain concrete plate 2 and interface built-in slip casting pipe between diaphragm wall 1 and steel bar concrete partition wall 3 under water.Slip casting shutoff is compensated when there is percolating water at interface.
Embodiment 5
A kind of highly permeable stratum deep foundation ditch back cover water-stopping structure construction method as shown in Figures 4 and 5, the mentality of designing of this method is: adopt diaphragm wall as space enclosing structure, underground water position adopts underwater excavation below, the rapid water proof back cover of substrate underwater casting element concrete plate, jointly resist water pressure in conjunction with uplift pile, prevent from dashing forward and gush destruction.Under water plain concrete plate and diaphragm wall closely cementing, and the through rabbet groove of multiple tracks level is set, prevents the two joint place from seepage erosion occurring, also the leakage problems do not closed because of construction reason curtain is made up, Grouting Pipe is reserved in joint place, once there is seepage in joint place, can injecting treatment in time.Comprise the steps:
Step 1, according to artesian water water pressure and the excavation of foundation pit degree of depth, carries out anti-prominent gushing, anti-current soil and anti-piping Stability Checking, determines plain concrete plate 2 thickness, uplift pile 4 arrangement parameter and rabbet groove parameter under water;
Step 2, diaphragm wall 1, steel bar concrete partition wall 3 and uplift pile 4 is built from ground construction, steel bar concrete partition wall described in every two sides 3 and diaphragm wall 1 are enclosed in substrate and are formed and build storehouse, in storehouse, substrate has been built uplift pile 4, with build steel bar concrete partition wall 3 that plain concrete plate 2 is under water connected, uplift pile 4 and diaphragm wall 1 interface in advance and reserve level to through rabbet groove;
Step 3, layer and section down excavates, and sets up inner support 6 in time, until be excavated to more than underground water position, then sets up nearest one inner support 6 of more than water level;
Step 4, the underwater excavation earthwork, until under water below plain concrete plate, underwater excavation must adopt suitable facility, if suction dredge is in order to remove mud etc., avoids siltation, affects underwater concreting quality;
Step 5, removes steel bar concrete partition wall 3, uplift pile 4 and diaphragm wall 1 under water and reserves level to through rabbet groove, then sequence placing plain concrete plate 2 under water;
Step 6, layering is pump drainage underground water down, and sets up platform in time, sets up inner support 6 on the water, until by whole for underground water pump drainage;
Step 7, backfills macadam 5 above plain concrete plate 2 under water, lays draining blind pipe, pump drainage percolating water;
Step 8, apply agent structure from the bottom up, lay waterproofing course, sequentially remove inner support 6, top board backfills.
Embodiment 6
A kind of highly permeable stratum deep foundation ditch back cover water-stopping structure as Figure 7-8 and construction method thereof, on the basis of embodiment 5, step 2 makes the rabbet groove grinding tool on steel bar concrete partition wall 3, adopt the horizontal bar steel plate of upper and lower two panels, the vertical bar steel plate of a slice and multiple tracks stiffening rib soldering group are dressed up "] " shaped steel groove, steel tank integral solder is on the main muscle of prefabricated reinforced concrete partition wall 3, steel tank establishes anchor bar behind, the filler (such as ethene block or air bag etc.) removed under being pre-charged with the Yishui River in steel tank, later stage forms rabbet groove after removing filler under water by diver.
Embodiment 7
A kind of highly permeable stratum deep foundation ditch back cover water-stopping structure as shown in figs. 9-10 and construction method thereof, on the basis of embodiment 5, step 2 makes the rabbet groove grinding tool in uplift pile 4, upper and lower two panels horizontal annular steel plate, a slice vertical circular steel plate and multiple tracks stiffening rib soldering group is adopted to dress up "] " shaped steel groove, steel tank ring reinforcing cage is welded on the main muscle of uplift pile for one week, steel tank establishes anchor bar behind, the filler (such as ethene block or air bag etc.) removed under being pre-charged with the Yishui River in steel tank, the later stage remove filler under water by diver after form rabbet groove.
Embodiment 8
A kind of highly permeable stratum deep foundation ditch back cover water-stopping structure as shown in Figures 4 and 5 and construction method thereof, on the basis of embodiment 5, when step 2 builds diaphragm wall 1, leak between cold seam place employing three rotary churning piles between framing or sleeve valve barrel grouting process width, reduce the level difference distortion between framing simultaneously.
Embodiment 9
A kind of highly permeable stratum deep foundation ditch back cover water-stopping structure as shown in Figures 4 and 5 and construction method thereof, on the basis of embodiment 5, step 5 build under water plain concrete plate 2 time, plain concrete plate 2 and interface built-in slip casting pipe between diaphragm wall 1 and steel bar concrete partition wall 3 under water.Slip casting shutoff is compensated when there is percolating water at interface.
The above; it is only preferred embodiment of the present invention; not any pro forma restriction is done to the present invention; according to technical spirit of the present invention; within the spirit and principles in the present invention; the any simple amendment that above embodiment is done, equivalently replace and improve, within the protection domain all still belonging to technical solution of the present invention.
Claims (9)
1. a highly permeable stratum deep foundation ditch back cover water-stopping structure, comprise diaphragm wall (1), plain concrete plate (2) under water, steel bar concrete partition wall (3), uplift pile (4) and inner support (6), diaphragm wall (1) is arranged on around foundation ditch by building, it is characterized in that: described inner support (6) is supported on diaphragm wall, described diaphragm wall (1) below foundation ditch forms steel bar concrete partition wall (3) by building, steel bar concrete partition wall (3) described in every two sides and diaphragm wall (1) are enclosed in substrate and are formed and build storehouse, uplift pile (4) has been built below substrate in storehouse, by building formation plain concrete plate (2) under water in each storehouse that steel bar concrete partition wall (3) and diaphragm wall (1) enclose, described uplift pile (4) is mounted under water in plain concrete plate (2).
2. a kind of highly permeable stratum according to claim 1 deep foundation ditch back cover water-stopping structure, is characterized in that: described plain under water concrete plate (2) is upper lays the thick macadam of 0.5m (5), lays draining blind pipe in described macadam.
3. a kind of highly permeable stratum according to claim 1 deep foundation ditch back cover water-stopping structure, is characterized in that: described steel bar concrete partition wall (3) is gone up and plain concrete plate (2) junction is provided with rabbet groove under water; Described uplift pile (4) is gone up and plain concrete plate (2) junction is provided with rabbet groove under water; Described diaphragm wall (1) is gone up and plain concrete plate (2) junction is provided with rabbet groove under water.
4. a kind of highly permeable stratum according to claim 1 deep foundation ditch back cover water-stopping structure, is characterized in that: described plain under water concrete plate (2) and interface built-in slip casting pipe between diaphragm wall (1) and steel bar concrete partition wall (3).
5. a highly permeable stratum deep foundation ditch back cover water-stopping structure construction method, is characterized in that, comprise the steps:
Step 1, according to artesian water water pressure and the excavation of foundation pit degree of depth, carries out anti-prominent gushing, anti-current soil and anti-piping Stability Checking, determines plain concrete plate (2) thickness, uplift pile (4) arrangement parameter and rabbet groove parameter under water;
Step 2, diaphragm wall (1), steel bar concrete partition wall (3) and uplift pile (4) is built from ground construction, steel bar concrete partition wall (3) described in every two sides and diaphragm wall (1) are enclosed in substrate and are formed and build storehouse, in storehouse, below substrate, built uplift pile (4), with build steel bar concrete partition wall (3) that plain concrete plate (2) is under water connected, uplift pile (4) and diaphragm wall (1) interface in advance and reserve level to through rabbet groove;
Step 3, layer and section down excavates, and sets up inner support (6) in time, until be excavated to more than underground water position, then sets up nearest one inner support (6) of more than water level;
Step 4, the underwater excavation earthwork, until plain concrete plate (2) bottom surface under water;
Step 5, removes the rabbet groove groove inner stuffing on steel bar concrete partition wall (3), uplift pile (4) and diaphragm wall (1) under water, then sequence placing plain concrete plate (2) under water;
Step 6, layering is pump drainage underground water down, and sets up platform in time, sets up inner support (6) on the water, until by whole for underground water pump drainage;
Step 7, plain concrete plate (2) top backfill macadam (5), lays draining blind pipe, pump drainage percolating water under water;
Step 8, apply agent structure from the bottom up, lay waterproofing course, sequentially remove support, top board backfills.
6. a kind of highly permeable stratum according to claim 5 deep foundation ditch back cover water-stopping structure construction method, is characterized in that; Described step 2 makes the rabbet groove grinding tool on diaphragm wall (1) and steel bar concrete partition wall (3), the horizontal bar steel plate of upper and lower two panels, the vertical bar steel plate of a slice and multiple tracks stiffening rib soldering group is adopted to dress up "] " shaped steel groove, shaped steel groove integral solder is on diaphragm wall (1) and steel bar concrete partition wall (3) main muscle, steel tank establishes anchor bar behind, the filler removed under being pre-charged with the Yishui River in steel tank.
7. a kind of highly permeable stratum deep foundation ditch back cover water-stopping structure according to claim 5 and construction method thereof, is characterized in that; Described step 2 makes the rabbet groove grinding tool in uplift pile (4), upper and lower two panels horizontal annular steel plate, a slice vertical circular steel plate and multiple tracks stiffening rib soldering group is adopted to dress up "] " shaped steel groove, steel tank ring reinforcing cage is welded on the main muscle of uplift pile for one week, steel tank establishes anchor bar behind, the filler removed under being pre-charged with the Yishui River in steel tank.
8. a kind of highly permeable stratum deep foundation ditch back cover water-stopping structure according to claim 5 and construction method thereof, is characterized in that; When described step 2 builds diaphragm wall (1), leak between cold seam place employing three rotary churning piles between framing or sleeve valve barrel grouting process width, reduce the level difference distortion between framing simultaneously.
9. a kind of highly permeable stratum deep foundation ditch back cover water-stopping structure according to claim 5 and construction method thereof, is characterized in that; Described step 5 build under water plain concrete plate (2) time, plain concrete plate (2) and interface built-in slip casting pipe between diaphragm wall (1) and steel bar concrete partition wall (3) under water.
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