CN102182192A - Rear transverse septum type building foundation pit enclosure structure and construction method - Google Patents
Rear transverse septum type building foundation pit enclosure structure and construction method Download PDFInfo
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- CN102182192A CN102182192A CN 201110054205 CN201110054205A CN102182192A CN 102182192 A CN102182192 A CN 102182192A CN 201110054205 CN201110054205 CN 201110054205 CN 201110054205 A CN201110054205 A CN 201110054205A CN 102182192 A CN102182192 A CN 102182192A
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Abstract
The invention discloses a rear transverse septum type building foundation pit enclosure structure. The structure comprises a plurality of enclosure piles (25), the tops of the enclosure piles (25) are provided with capping beams (26) and capping beam inner supports (27), each enclosure pile (25) is formed by connecting prestressed high-strength concrete (PHC) tubular piles (8), and the joints of the PHC tubular piles (8) of each layer of all the enclosure piles (25) are fixedly connected by a concrete transverse septum (24) of the layer. The rear transverse septum type building foundation pit enclosure structure has stronger strength and bearing capacity. The invention also discloses a construction method of the rear transverse septum type building foundation pit enclosure structure. The construction method roughly comprises the following steps of: driving the plurality of enclosure piles (25), and then injecting slurry so that the concrete outside the tubular walls at the joints of the PHC tubular piles (8) of each layer of all the enclosure piles (25) is mutually anchored to form the concrete transverse septum (24) of the layer. The enclosure structure constructed by the construction method has stronger strength and bearing capacity.
Description
Technical field
The present invention relates to field of civil engineering, especially a kind of rearmounted tabula formula building foundation pit enclosure structure and job practices when the weak soil environment is constructed.
Background technology
The building foundation pit enclosure structure of prior art comprises the many rhizospheres fender pile (being generally bored pile) along the edge distribution of foundation ditch, the top of fender post is provided with the capping beam that connects each fender post, also be provided with in the capping beam with the absolute altitude place with capping beam and support, the fender post inboard promptly is provided with the purlin that encloses that one deck at least connects each fender post by the side at foundation ditch center, every layer of same absolute altitude place that encloses purlin is provided with to enclose in the purlin and supports, the fender post outside promptly is provided with water-stop curtain away from a side at foundation ditch center, and water-stop curtain is generally many concrete agitation piles that abut one another.
The job practices of the building foundation pit enclosure structure of prior art is: earlier at precalculated position construction fender post, after all the fender post construction is finished, at fender post top cast capping beam, and between capping beam, support in the cast capping beam, water-stop curtain is set then, excavation pit again, when excavation pit to the pre-designed absolute altitude that encloses purlin, enclose purlin in the inboard cast of fender post, and enclose in the purlin and support enclosing between the purlin cast, only being one deck if enclose the purlin number, then directly being excavated to the foundation ditch bottom, is multilayer if enclose purlin, then continue the excavation pit pre-designed height that encloses purlin of one deck extremely down, continue cast and enclose purlin and enclose support in the purlin, repeat down to dig and pour into a mould to enclose purlin and enclose the step that supports in the purlin, until excavating the foundation ditch bottom.
Along with the continuous expansion that the building underground space is utilized, the scale of excavation of foundation pit and the degree of depth also constantly enlarge, and intensity and the bearing capacity to foundation pit enclosure structure had higher requirement accordingly.And support owing to the building foundation pit enclosure structure of prior art only relies in capping beam, the capping beam, enclose purlin and enclose and support the fender post that each is single in the purlin and be connected to each other supporting is provided; its intensity and bearing capacity deficiency; being difficult to provides enough support and protections to bigger darker foundation ditch, even the potential safety hazard that exists foundation ditch to cave in.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of intensity and bearing capacity stronger rearmounted tabula formula building foundation pit enclosure structure.
Technical solution of the present invention is, a kind of rearmounted tabula formula building foundation pit enclosure structure is provided, it comprises the many rhizosphere fender pile of at least one circle along the edge distribution of foundation ditch, the top of every corral fender pile is provided with a circle capping beam that connects this corral fender pile, be provided with in the capping beam with the absolute altitude place with capping beam and support, the fender post outside is provided with water-stop curtain, every rhizosphere fender pile is formed by connecting up and down by at least two PHC pile tubes, and per two PHC pile tubes connect by a connector, all the junction of the PHC pile tube of each layer of fender post is fixedly connected by the concrete tabula of this layer, purlin is enclosed for this layer in the inboard of at least one layer concrete tabula, and every layer of same absolute altitude place that encloses purlin is provided with to enclose in the purlin and supports.
The rearmounted tabula formula of the present invention building foundation pit enclosure structure compared with prior art has following remarkable advantage and beneficial effect:
Because building foundation pit enclosure structure of the present invention is except relying on capping beam, support in the capping beam, enclose purlin and enclose and support the fender post that each is single in the purlin and be connected to each other and provide beyond the supporting, more outstanding characteristics are, the fender post that all are single is fixed into an integral body by the concrete tabula is crosslinked, and also more than one deck of concrete tabula, but multilayer, like this, just make whole fender posts produce efficiency of pile groups, stressed other fender post that can both disperse rapidly of any rhizosphere fender pile of foundation ditch to periphery, so the intensity and the bearing capacity of this foundation pit enclosure structure strengthen significantly, and then can provide enough support and protections to bigger darker foundation ditch, stopped the potential safety hazard that foundation ditch caves in; Simultaneously again because with respect to the complete solid drill-pouring pile as fender post of the general employing of prior art, when the present invention adopts the PHC pile tube to make fender post, not only intensity and bearing capacity are stronger, and the pile cutoff except PHC pile tube junction is hollow pile, and its material is more economized, cost is lower.
As improvement, be two circles along many rhizospheres fender pile of the edge distribution of foundation ditch, the fender post outside of outer ring is provided with water-stop curtain, and every rhizosphere fender pile is formed by connecting by many PHC pile tubes; The inboard of multi-layer concrete tabula is the purlin that encloses of this layer, and like this, two circles are cross-linked into intensity and the bearing capacity that whole fender post can increase this foundation pit enclosure structure by the multi-layer concrete tabula.
Another technical problem that the present invention will solve is that the job practices of the stronger rearmounted tabula formula building foundation pit enclosure structure of a kind of intensity and bearing capacity is provided.
Another technical solution of the present invention is, a kind of job practices of rearmounted tabula formula building foundation pit enclosure structure is provided, and its step is as follows:
(1), prepares a plurality of two ends and do not have the PHC pile tubes that end plate and each end are provided with four short slots that extend vertically;
(2), prepare a plurality of placing and make circumferentially location and can be of two PHC pile tubes between the two PHC pile tubes to the connector of the inside and outside slip casting of tube wall of two PHC pile tube junctions;
(3), an end and the pile crown of a PHC pile tube are fixed, this PHC pile tube is squeezed in the weak soil of predetermined stake position, exposed ground with convenient follow-up construction until this PHC pile tube upper end certain-length with pile driver;
(4), make two the highest PHC pile tubes of position circumferentially locate to the top of the PHC pile tube that exposes ground and by connector first section of grouting pipe and the handling of another root PHC pile tube, and install first section of grouting pipe with hanging device;
(5), squeeze into weak soil, expose ground with convenient follow-up construction until this PHC pile tube upper end certain-length with the pile driver PHC pile tube that the position is the highest;
(6), with hanging device with another section of grouting pipe and again the handling of another root PHC pile tube make two the highest PHC pile tubes of position circumferentially locate to the top of the PHC pile tube that exposes ground and by another connector, and install this grouting pipe another the section;
(7), squeeze into weak soil, expose ground with convenient follow-up construction until this PHC pile tube upper end certain-length with the pile driver PHC pile tube that the position is the highest;
(8), repeating step (6)～(7) repeatedly, the number of the PHC pile tube in being driven into weak soil reaches designing requirement, at this moment, all grouting pipe sections form a complete grouting pipe;
(9), continue the PHC pile tube that the position is the highest with pile driver and squeeze into weak soil, until this PHC pile tube top and ground level, at this moment, the piling step of the single fender post of being made up of many PHC pile tubes is finished;
(10), repeating step (3)～(9), at this moment, the piling step of the single fender post of being made up of many PHC pile tubes of another root piles with different position is finished;
(11), repeating step (10) repeatedly, finish until the piling step of these all fender posts of building foundation pit enclosure structure;
(12), from the bottom up to the inside and outside slip casting of tube wall of the junction of the PHC pile tube of each layer of each rhizosphere fender pile, and make the tube wall mutual anchoring of concrete outward of the outer concrete of the tube wall of junction of PHC pile tube of each layer of each rhizosphere fender pile and the junction of the PHC pile tube of same one deck of adjacent fender post, all the outer mutual anchoring of concrete of the tube wall of the junction of the PHC pile tube of each layer of fender post is the concrete tabula of this layer, at this moment, the construction of the fender post of building foundation pit enclosure structure is finished;
(13), at each fender post top cast capping beam, and between capping beam, support in the cast capping beam;
(14), at each fender post arranged outside water-stop curtain;
(15), excavation pit, until the height that excavates a certain layer concrete tabula, enclose purlin, and enclose in the purlin and support enclosing between the purlin cast in the inboard cast of concrete tabula;
(16), continue the absolute altitude that excavation pit to following one deck that sets in advance encloses purlin, and this layer encloses purlin and a certain layer concrete tabula is contour, continues enclosing purlin and enclosing the interior support of purlin of this layer of cast;
(17), repeating step (16) repeatedly, enclosing purlin and enclosing and support cast in the purlin and finish until minimum one deck.
The job practices of the rearmounted tabula formula of the present invention building foundation pit enclosure structure compared with prior art has following remarkable advantage and beneficial effect again:
Because this job practices makes many PHC pile tubes connect up and down by connector, and by making whole fender posts be cross-linked into integral body to slip casting inside and outside the connector, realize efficiency of pile groups, so the space enclosing structure intensity and the bearing capacity that utilize this job practices to construct out strengthen significantly.
As improvement, connector is the structure that roughly is dumbbell shaped that is made of the waist that contracts in the head at two ends and the centre, the external diameter of the head of connector is slightly less than the internal diameter of PHC pile tube, the length of the waist of connector is not more than the twice of length of the short slot of every PHC pile tube one end, connector is through with a through hole along axis, the two ends of through hole are arranged with two unidirectional funnels that can only flow to osculum from big mouth, and the osculum of each unidirectional funnel is positioned at connector the inner; This connector is fixed with the steel wing plate that four block lengths equate with the connector waist, four blocks of steel wing plates run through the tube wall of waist and evenly distribute along the circumference of waist, every block of steel wing plate is provided with first passage, second channel that connects thickness direction that connects width and the third channel that connects thickness direction, first passage and second channel are interconnected, first passage and third channel are interconnected, the inlet of first passage is positioned at the through hole of connector, and such connector structure makes that the process of the inside and outside slip casting of tube wall of PHC pile tube junction is convenient and reliable.
As improving again, make two the highest PHC pile tubes of position circumferentially be meant the location by connector, a connector is placed the top of the PHC pile tube that exposes ground, again with hanging device with the top of another root PHC pile tube handling to the PHC pile tube that exposes ground, make the steel wing plate of alignment of two pile tubes and connector be positioned at, down in the short slot of two PHC pile tubes, two outlets of the second channel of every block of steel wing plate are in the inwall and the slit between the connector waist outer wall of PHC pile tube at this moment, two outlets of the outlet of the first passage of every block of steel wing plate and third channel all are positioned at outside the outer wall of PHC pile tube, like this, make that by connector the specific operation process of the circumferential location of two PHC pile tubes that the position is the highest is convenient and reliable.
As also improving, first section that installs grouting pipe in the step (4) is meant, after the top that connector is exposing the PHC pile tube on ground installs, first section grout outlet of grouting pipe is inserted the unidirectional funnel below of the through hole upper end of connector, again another root PHC pile tube is installed in the top of the PHC pile tube that exposes ground, at this moment, first section top of grouting pipe is lower than the top of the highest PHC pile tube in position, like this, can guarantee that pile driver strikes in the subsequent step of stake, the top that only can beat the highest PHC pile tube in position, and first section top can not striking grouting pipe.
As further improvement, another section that installs this grouting pipe in the step (6) is meant, a joint is installed on one section top at next grouting pipe highly, make the top of this joint be higher than the top of the PHC pile tube that exposes ground, connector in the step (6) is passed this joint, then on this joint the grouting pipe in the installation steps (6) another the section, at last, another root PHC pile tube is installed on the top of the PHC pile tube that exposes ground, at this moment, one section top of the grouting pipe that the position is the highest is lower than the top of the highest PHC pile tube in position, like this, can guarantee that pile driver strikes in the subsequent step of stake, the top that can beat the highest PHC pile tube 8 in position, and one section top can not striking the highest grouting pipe in position.
As further improving again, in the tube wall to the junction of the PHC pile tube of each layer in the step (12), outer slip casting is meant, slurries are under the effect of unidirectional funnel, earlier the through hole between two unidirectional funnels of connector is filled up, and from the inlet of first passage through first passage, second channel is filled the inwall of full PHC pile tube and the slit between the connector waist outer wall, simultaneously, concrete slurry flows out to the outlet of first passage and two outlets of third channel from the inlet of first passage, makes, near the outer weak soil of the outer wall two PHC pile tube short slots is squeezed and is opened and form the warty concrete down; Step is meant in (12) from the bottom up, first unidirectional funnel below on the connector through hole of lowermost layer is to the inside and outside slip casting of the tube wall of this layer junction, take out the length of a PHC pile tube of grouting pipe then, make the grout outlet of grouting pipe rise to the unidirectional funnel below of the connector through hole upper end of a height, again to the inside and outside slip casting of tube wall of junction of a last height, take out grouting pipe and slip casting again, the inside and outside slip casting of tube wall until the junction of the PHC pile tube of the highest one deck in position is finished, like this, can guarantee that the slip casting process is unobstructed, slip casting effect good.
As also further improving, steel wing plate of the connector of the junction of each layer PHC pile tube of every rhizosphere fender pile pastes mutually with the steel wing plate of adjacent fender post with the connector of the junction of the PHC pile tube of one deck, so more help the mutual anchoring of concrete of junction of each layer PHC pile tube of adjacent fender post, reinforced this foundation pit enclosure structure greatly.
As also further improving again, cast in step (15), (16), (17) is enclosed purlin and is meant, establish one in concrete tabula inboard and enclose the purlin side template, to the concrete tabula with enclose slip casting between the purlin side template, this layer enclose purlin, such construction sequence is enclosed under the prerequisite of purlin intensity guaranteeing, omitted the step that the purlin reinforcing cage is enclosed in the placement of prior art, so more convenient and quicker; Cast is enclosed to support in the purlin and is meant in step (15), (16), (17), when this layer enclose the purlin casting complete after, on enclosing purlin, need to be provided with and enclose the position of supporting in the purlin and knock concrete open, expose that piece steel wing plate that is anchored at the connector that encloses in the purlin by the foundation ditch inboard, the reinforcing cage that supports in the purlin is enclosed in welding on this steel wing plate again, lay this then and enclose two side templates that support in the purlin, cast at last, enclosing in the purlin of this layer support, like this, do not have reinforcing cage in the purlin though enclose, enclose the reinforcing cage that supports in the purlin and still can find suitable pad.
Description of drawings
Fig. 1 is the stretch-draw joint in rearmounted tabula formula building foundation pit enclosure structure of the present invention and the job practices and the structural representation of stretch-draw plate.
Fig. 2 is the structural representation of the cuboid batten in rearmounted tabula formula building foundation pit enclosure structure of the present invention and the job practices when being installed on the stretch-draw plate.
Fig. 3 is the sectional structure schematic diagram of the connector in rearmounted tabula formula building foundation pit enclosure structure of the present invention and the job practices.
Fig. 4 is the structural representation of the connector that steel wing plate is installed in rearmounted tabula formula building foundation pit enclosure structure of the present invention and the job practices.
Fig. 5 is the plan structure figure of Fig. 4.
Fig. 6 is the sectional structure chart of Fig. 4 along the A-A line.
Fig. 7 is the preceding structural representation of junction grouting of the PHC pile tube in rearmounted tabula formula building foundation pit enclosure structure of the present invention and the job practices.
Fig. 8 is the blast structural representation of the junction of the PHC pile tube in rearmounted tabula formula building foundation pit enclosure structure of the present invention and the job practices.
Fig. 9 is the cross section structure for amplifying schematic diagram after being in the milk in the junction of the PHC pile tube in rearmounted tabula formula building foundation pit enclosure structure of the present invention and the job practices.
Figure 10 is the structural representation of the upper shuttering that is used for making connector in rearmounted tabula formula building foundation pit enclosure structure of the present invention and the job practices, following formwork and inner mold.
Figure 11 be in rearmounted tabula formula building foundation pit enclosure structure of the present invention and the job practices not during slip casting from the cross-sectional structure schematic diagram of the junction intercepting of the PHC pile tube of each fender post.
Figure 12 is the structural representation of each fender post of rearmounted tabula formula building foundation pit enclosure structure of the present invention.
Figure 13 be rearmounted tabula formula building foundation pit enclosure structure of the present invention overlook the partial structurtes schematic diagram.
Figure 14 is the cross section structure schematic diagram of rearmounted tabula formula building foundation pit enclosure structure of the present invention from the intercepting of concrete tabula.
Shown in the figure 1, the stretch-draw joint, 2, screwed hole, 3, horn mouth, 4, the stretch-draw plate, 5, the cuboid batten, 6, short slot, 7, connector, 7.1, head, 7.2, waist, 8, the PHC pile tube, 9, through hole, 10, unidirectional funnel, 11, steel wing plate, 12, first passage, 13, second channel, 14, the transversely strengthening reinforcing bar, 15, the longitudinal reinforcement reinforcing bar, 16, the warty concrete, 17, fanning strip, 18, upper shuttering, 19, following formwork, 20, inner mold, 21, slot, 22, mounting groove, 23, third channel, 24, the concrete tabula, 25, fender post, 26, capping beam, 27, support 28 in the capping beam, enclose purlin, 29, enclose in the purlin and support.
The specific embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
As Figure 12, Figure 13, shown in Figure 14, the rearmounted tabula formula of the present invention building foundation pit enclosure structure, it comprises that two circles are many rhizospheres fender pile 25 of linear distribution along the edge of foundation ditch.The top of every corral fender pile 25 is provided with a circle capping beam 26 that connects this corral fender pile 25, the top that is outer ring fender post 25 is provided with the outer ring capping beam 26 that connects outer ring fender post 25, and the top of inner ring fender post 25 is provided with the inner ring capping beam 26 that connects inner ring fender post 25, but in fact the inside and outside circle capping beam 26 of present embodiment is exactly the capping beam 26 that a circle is widened.Be provided with the absolute altitude place with capping beam 26 and support 27 in the capping beam.Fender post 25 outsides of outer ring are provided with water-stop curtain.Every rhizosphere fender pile 25 is formed by connecting up and down by many PHC pile tubes 8, and per two PHC pile tubes 8 connect by a connector 7.All the junction of the PHC pile tube 8 of each layer of fender post 25 is fixedly connected by the concrete tabula 24 of this layer.Purlin 28 is enclosed for this layer in the inboard of multi-layer concrete tabula 24 (near the side at foundation ditch center), and every layer of same absolute altitude place that encloses purlin 28 is provided with to enclose in the purlin and supports 29.
As Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Figure 10, Figure 11, Figure 12, Figure 13, shown in Figure 14, the job practices of rearmounted tabula formula building foundation pit enclosure structure of the present invention, its step is as follows:
(1), prepares a plurality of two ends and do not have the PHC pile tubes 8 that end plate and each end are provided with four short slots 6 that extend vertically; All PHC pile tubes 8 of present embodiment all adopt the prepared PHC pile tube 8 of step (1).
The concrete preparation process of PHC pile tube 8 is as follows:
A, placement lower bolster;
B, prepare several with threaded hole 2 and the stretch-draw joint 1 of horn mouth 3, described screwed hole 2 is positioned at horn mouth 3 outsides and both coaxial lines, described stretch-draw joint 1 adopts round steel to form through conventional machine;
C, at four cuboid battens 5 that extend vertically of stretch-draw plate 4 installed inside of every circle, described four cuboid battens 5 are positioned on the same circumference of stretch-draw plate 4 and at this circumference and evenly distribute;
D, the reinforcing cage that colligation is good are placed on the lower bolster, with every longitudinal reinforcement two ends of reinforcing cage put stretch-draw joint 1 again heading make that the heading of longitudinal reinforcement is spacing by horn mouth 3, the screw that will pass the through hole of stretch-draw plate 4 again screws in the screwed hole 2 of stretch-draw joint 1, and the stretch-draw joint 1 that makes each and longitudinal reinforcement fix is fixed on the side that stretch-draw plate 4 is equipped with cuboid batten 5;
E, fix to PHC pile tube 8 two ends stretch-draw stretch-draw plates 4 and with stretch-draw plate after the stretch-draw 4 and lower bolster, be about to stretch-draw plate 4 and be connected on the lower bolster, again fluid concrete with tensioner;
F, cope match-plate pattern is closed up on lower bolster;
G, rotation reinforcing cage and mould make concrete form the tubular of hollow under centrifugal action;
H, in the steam pond curing concrete;
I, after concrete strength reaches designing requirement, disassemble stretch-draw plate 4, longitudinal reinforcement on the reinforcing cage shrinks because of the stretching force disappearance that stretch-draw plate 4 provides at this moment, and then concrete is compressed by the bonding between reinforcing bar and the concrete, the preparation of PHC pile tube 8 is finished, and each end of this PHC pile tube 8 forms four short slots 6 corresponding with cuboid batten 5 positions.
(2), prepare a plurality of placing and make circumferentially location and can be of two PHC pile tubes 8 between the two PHC pile tubes 8 to the connector 7 of the inside and outside slip casting of tube wall of two PHC pile tubes, 8 junctions;
Connector 7 is the structure that roughly is dumbbell shaped that is made of the waist 7.2 that contracts in the head 7.1 at two ends and the centre, the external diameter of the head 7.1 of connector 7 is slightly less than the internal diameter of PHC pile tube 8, the length of the waist 7.2 of connector 7 is not more than the twice of length of the short slot 6 of every PHC pile tube 8 one ends, connector 7 is through with a through hole 9 along axis, the two ends of through hole 9 are arranged with two unidirectional funnels 10 that can only flow to osculum from big mouth, and the osculum of each unidirectional funnel 10 is positioned at connector 7 the inners; This connector 7 is fixed with the steel wing plate 11 that four block lengths equate with connector 7 waists 7.2, four blocks of steel wing plates 11 run through the tube wall of waist 7.2 and evenly distribute along the circumference of waist 7.2, every block of steel wing plate 11 is provided with first passage 12, second channel 13 that connects thickness direction that connects width and the third channel 23 that connects thickness direction, first passage 12 and second channel 13 are interconnected, first passage 12 and third channel 23 are interconnected, and the inlet of first passage 12 is positioned at the through hole 9 of connector 7.
The fanning strip 17 that unidirectional funnel 10 is made by elastomeric material by polylith constitutes, the circular arc limit of every fanning strip 17 is fixed on the same circle of connector 7 through holes 9 inwalls, and the straight flange of the straight flange of every fanning strip 17 and adjacent fanning strip 17 leaves the slit under nature.Like this, when slurries were positioned at osculum one end of unidirectional funnel 10, slurries can be with adjacent fanning strip 17 jam-packeds, made that the slit between the straight flange of adjacent fanning strip 17 is crowded more little more, and last slit disappears unidirectional funnel 10 complete closed; When slurries were positioned at the big mouthful end of unidirectional funnel 10, slurries can adjacent fanning strip 17 crowded holding, and made that the slit between the straight flange of adjacent fanning strip 17 is crowded more big more, and last unidirectional funnel 10 opens fully.
The concrete preparation method of connector 7 is as follows:
A, the upper shuttering 18 of preparation symmetry, following formwork 19 and inner mold 20, the profile of the cavity shape of described upper shuttering 18 and connector 7 the first half is coincide, the lower end of upper shuttering 18 is provided with and the corresponding slot 21 in steel wing plate 11 positions, the shape of the described die cavity of formwork 19 down and the latter half profile of connector 7 are coincide, the upper end of following formwork 19 is provided with and the corresponding slot 21 in steel wing plate 11 positions, the periphery of inner mold 20 is provided with the mounting groove 22 that steel wing plate 11 is installed, on the inner mold 20, the lower end is with pre-buried iron ring respectively, and inner mold is by in the removable connection, following two parts constitute, according to common practise, described upper shuttering 18 is provided with the running channel (not shown);
B, on steel wing plate 11 welding transversely strengthening reinforcing bar 14 and longitudinal reinforcement reinforcing bar 15;
C, will descend formwork 19 fixing, insert steel wing plate 11 in the mounting grooves 22 and steel wing plate 11 passes slot 21 with inner mold 20;
D, upper shuttering 18 and following formwork 19 is fixing, steel wing plate 11 is positioned at the slot 21 of upper and lower formwork at this moment;
E, cast connector 7 make transversely strengthening reinforcing bar 14 and longitudinal reinforcement reinforcing bar 15 be anchored in the concrete;
F, dismounting be formwork 19, upper shuttering 18 down, and disassembles upper and lower two parts of inner mold 20 from upper and lower both direction;
(3), an end and the pile crown of a PHC pile tube 8 are fixed, this PHC pile tube 8 is squeezed in the weak soil of predetermined stake position, exposed ground with convenient follow-up construction (as connector 7, grouting pipe etc. are installed) until these PHC pile tube 8 upper end certain-lengths with pile driver.Described certain-length is meant between 0.3m～1.3m, preferred 0.8m, and the certain-length that all PHC pile tube 8 upper ends of present embodiment expose all is meant 0.8m.
(4), to be pile driving frame with hanging device make two the highest PHC pile tubes 8 of position circumferentially locate to the top of the PHC pile tube 8 that exposes ground and by connector 7 first section of grouting pipe and 8 handlings of another root PHC pile tube, and installs first section of grouting pipe.
The concrete operations that make the highest two PHC pile tubes 8 in position circumferentially locate by connector 7 are: the top that a connector 7 is placed the PHC pile tube 8 that exposes ground, again with hanging device with the top of another root PHC pile tube 8 handlings to the PHC pile tube 8 that exposes ground, make the steel wing plate 11 of alignment of two pile tubes and connector 7 be positioned at, down in the short slot 6 of two PHC pile tubes 8, two outlets of the second channel 13 of every block of steel wing plate 11 are in the inwall and the slit between connector 7 waists 7.2 outer walls of PHC pile tube 8 at this moment, and two outlets of the outlet of the first passage 12 of every block of steel wing plate 11 and third channel 23 all are positioned at outside the outer wall of PHC pile tube 8.
First section concrete operations that install grouting pipe are, after the top that connector 7 is exposing the PHC pile tube 8 on ground installs, first section grout outlet of grouting pipe is inserted unidirectional funnel 10 belows of through hole 9 upper ends of connector 7, again another root PHC pile tube 8 is installed in the top of the PHC pile tube 8 that exposes ground, at this moment, first section top of grouting pipe is lower than the top of the highest PHC pile tube 8 in position, such height relationships is in order to guarantee that pile driver strikes in the subsequent step of stake, the top that only can beat the highest PHC pile tube 8 in position, and first section top can not striking grouting pipe.
(5), squeeze into weak soil, expose ground with convenient follow-up construction until these PHC pile tube 8 upper end certain-lengths with the pile driver PHC pile tube 8 that the position is the highest.
(6), with hanging device with another section of grouting pipe and again 8 handlings of another root PHC pile tube make two the highest PHC pile tubes 8 of position circumferentially locate to the top of the PHC pile tube 8 that exposes ground and by another connector 7, and install this grouting pipe another the section.
The concrete operations that install another section of this grouting pipe are, a joint is installed on one section top at next grouting pipe highly, make the top of this joint be higher than the top of the PHC pile tube 8 that exposes ground, connector 7 in the step (6) is passed this joint, then on this joint the grouting pipe in the installation steps (6) another the section, at last, another root PHC pile tube 8 is installed on the top of the PHC pile tube 8 that exposes ground.At this moment, the top of one section (being another section of firm mounted grouting pipe) of the grouting pipe that the position is the highest is lower than the top of the highest PHC pile tube 8 in position, such height relationships is in order to guarantee that pile driver strikes in the subsequent step of stake, the top that only can beat the highest PHC pile tube 8 in position, and one section top can not striking the highest grouting pipe in position.
(7), squeeze into weak soil, expose ground with convenient follow-up construction until these PHC pile tube 8 upper end certain-lengths with the pile driver PHC pile tube 8 that the position is the highest.
(8), repeating step (6)～(7) repeatedly, the number of the PHC pile tube 8 in being driven into weak soil reaches designing requirement.The number of designing requirement PHC pile tube 8 is N, and that is with regard to N-3 repeating step (6)～(7), is 4 as the number of PHC pile tube 8, just repeat 1 time, and be 5 as the number of PHC pile tube 8, just repeat 2 times, be 6 as the number of PHC pile tube 8, just repeat 3 times.
At this moment, all grouting pipe sections form a complete grouting pipe, specifically, all grouting pipe sections alternately are connected with joint, constitute a complete grouting pipe, and all grouting pipe sections are meant in another section of the grouting pipe that first section of grouting pipe that step (4) is installed, step (6) are installed and the step (8) repeatedly repeating step (6) and the set of another section of many grouting pipes of installation.
(9), continue the PHC pile tube 8 that the position is the highest with pile driver and squeeze into weak soil, until this PHC pile tube 8 tops and ground level, at this moment, the piling step of the single fender post of being made up of many PHC pile tubes 8 25 is finished; And the grouting pipe of the grouting pipe that forms in the step (8) the single fender post 25 that to be exactly this root be made of many PHC pile tubes 8.
(10), repeating step (3)～(9), at this moment, the piling step of the single fender post of being made up of many PHC pile tubes 8 25 of another root piles with different position is finished.
(11), repeating step (10) repeatedly, finish until the piling step of all fender posts 25 of this building foundation pit enclosure structure.
(12), from the bottom up to the inside and outside slip casting of tube wall of the junction of the PHC pile tube 8 of each layer of each rhizosphere fender pile 25, and make the tube wall mutual anchoring of concrete outward of the outer concrete of the tube wall of junction of PHC pile tube 8 of each layer of each rhizosphere fender pile 25 and the junction of the PHC pile tube 8 of same one deck of adjacent fender post 25, all the outer mutual anchoring of concrete of the tube wall of the junction of the PHC pile tube 8 of each layer of fender post 25 is the concrete tabula 24 of this layer, at this moment, the construction of the fender post 25 of building foundation pit enclosure structure is finished.And the job practices of foundation pit enclosure structure of the present invention is the piling step of carrying out fender post 25 earlier, and the fluid concrete concrete tabula 24 of purchasing again is so be called rearmounted tabula formula.
In the tube wall to the junction of the PHC pile tube 8 of each layer, the concrete operations of outer slip casting are, slurries are under the effect of unidirectional funnel 10, earlier the through hole 9 between 7 two unidirectional funnels 10 of connector is filled up, and from the inlet of first passage 12 through first passage 12, second channel 13 is filled the inwall of full PHC pile tube 8 and the slit between connector 7 waists 7.2 outer walls, simultaneously, concrete slurry flows out to the outlet of first passage 12 and two outlets of third channel 23 from the inlet of first passage 12, makes, near two PHC pile tubes, 8 short slots 6 the outer weak soil of outer wall is squeezed and is opened and form warty concrete 16 down.
Concrete operations from the bottom up are, elder generation is in the tube wall of unidirectional funnel 10 belows (also is unidirectional funnel 10 tops of connector 7 through holes 9 lower ends as can be known by general knowledge) to this layer junction of connector 7 through holes 9 upper ends of lowermost layer, outer slip casting, take out the length of a PHC pile tube 8 of grouting pipe then, make the grout outlet of grouting pipe rise to unidirectional funnel 10 belows of connector 7 through holes 9 upper ends of a height, again in the tube wall of junction to a last height, outer slip casting, take out grouting pipe and slip casting again, in the tube wall of the junction of the PHC pile tube 8 of the highest one deck in position, outer slip casting is finished.
(13), at each fender post 25 top cast capping beam 26, and support 27 in (being between capping beam 26 and the capping beam 26) cast capping beam between capping beam 26.
(14), at each fender post 25 arranged outside water-stop curtain, this water-stop curtain generally adopts the concrete agitation pile, step (13), (14) are all identical with prior art, so do not launch to describe.
(15), excavation pit, until the height that excavates certain one deck (one deck the highest) concrete tabula 24 as the position, enclose purlin 28 in the inboard cast of concrete tabula 24, and enclose support 29 in the purlin enclosing between the purlin 28 (i.e. enclosing purlin 28 and enclose between the purlin 28 with one deck) cast.It is the top purlin 28 that encloses that this layer encloses purlin 28, and the absolute altitude that this layer encloses purlin 28 is pre-designed, and this layer of design in advance absolute altitude of enclosing purlin 28 equals the height of a certain layer concrete tabula 24.
(16), continue the absolute altitude that excavation pit to following one deck that sets in advance encloses purlin 28, and this layer to enclose purlin 28 and certain one deck (one deck high as position second) concrete tabula 24 contour, continue enclosing purlin 28 and enclosing support 29 in the purlin of this layer of cast.
(17), repeating step (16) repeatedly, enclosing purlin 28 and enclosing and support 29 cast in the purlin and finish until minimum one deck.
The concrete operations that purlin 28 is enclosed in cast in step (15), (16), (17) are, establish one in concrete tabula 24 inboards and enclose purlin 28 side templates, to concrete tabula 24 with enclose slip casting between purlin 28 side templates, this layer enclose purlin 28.
Pouring into a mould the concrete operations of enclosing support 29 in the purlin in step (15), (16), (17) is, when this layer enclose purlin 28 casting completes after, on enclosing purlin 28, need to be provided with the position of enclosing support 29 in the purlin and knock concrete open, expose that piece steel wing plate 11 that is anchored at the connector 7 that encloses in the purlin 28 by the foundation ditch inboard, the reinforcing cage of support 29 in the purlin is enclosed in welding on this steel wing plate 11 again, lay this then and enclose and support two side templates of 29 in the purlin, cast at last, this layer enclose the interior support 29 of purlin.
After step (17) was finished, the work progress of rearmounted tabula formula building foundation pit enclosure structure of the present invention was finished; Dig foundation ditch to the foundation ditch bottom under continuing, at this moment, the work progress of whole foundation ditch is finished.
Below only just preferred embodiment of the present invention be described, but can not be interpreted as it is restriction to claim.The present invention not only is confined to above embodiment, and its concrete structure allows variation, as: the many rhizospheres fender pile 25 along the edge distribution of foundation ditch can only be a circle; Or the like.All various variations of being done in the protection domain of independent claims of the present invention are all in protection scope of the present invention.
Claims (10)
1. rearmounted tabula formula building foundation pit enclosure structure, it comprises the many rhizosphere fender pile (25) of at least one circle along the edge distribution of foundation ditch, the top of every corral fender pile (25) is provided with a circle capping beam (26) that connects this corral fender pile (25), be provided with support (27) in the capping beam with capping beam (26) with the absolute altitude place, fender post (25) outside is provided with water-stop curtain, it is characterized in that: every rhizosphere fender pile (25) is formed by connecting up and down by at least two PHC pile tubes (8), and per two PHC pile tubes (8) connect by a connector (7), all the junction of the PHC pile tube (8) of each layer of fender post (25) is fixedly connected by the concrete tabula (24) of this layer, purlin (28) is enclosed for this layer in the inboard of at least one layer concrete tabula (24), and every layer of same absolute altitude place that encloses purlin (28) is provided with to enclose and supports (29) in the purlin.
2. rearmounted tabula formula building foundation pit enclosure structure according to claim 1, it is characterized in that: the many rhizospheres fender pile (25) along the edge distribution of foundation ditch is two circles, the fender post of outer ring (25) outside is provided with water-stop curtain, and every rhizosphere fender pile (25) is formed by connecting by many PHC pile tubes (8); Purlin (28) is enclosed for this layer in the inboard of multi-layer concrete tabula (24).
3. the job practices of a rearmounted tabula formula building foundation pit enclosure structure, it is characterized in that: its step is as follows:
(1), prepares a plurality of two ends and do not have the PHC pile tubes (8) that end plate and each end are provided with four short slots (6) that extend vertically;
(2), prepare a plurality of placing and make circumferentially location and can be of two PHC pile tubes (8) between the two PHC pile tubes (8) to the connector (7) of the inside and outside slip casting of tube wall of two PHC pile tube (8) junctions;
(3), an end and the pile crown of a PHC pile tube (8) are fixed, this PHC pile tube (8) is squeezed in the weak soil of predetermined stake position, exposed ground with convenient follow-up construction until this PHC pile tube (8) upper end certain-length with pile driver;
(4), first section of grouting pipe and another root PHC pile tube (8) handling are made circumferentially location of the highest two PHC pile tubes (8) in position to the top of the PHC pile tube (8) that exposes ground and by connector (7), and install first section of grouting pipe with hanging device;
(5), squeeze into weak soil, expose ground with convenient follow-up construction until this PHC pile tube (8) upper end certain-length with the pile driver PHC pile tube (8) that the position is the highest;
(6), with hanging device with another section of grouting pipe and again another root PHC pile tube (8) handling make circumferentially location of the highest two PHC pile tubes (8) in position to the top of the PHC pile tube (8) that exposes ground and by another connector (7), and install another section of this grouting pipe;
(7), squeeze into weak soil, expose ground with convenient follow-up construction until this PHC pile tube (8) upper end certain-length with the pile driver PHC pile tube (8) that the position is the highest;
(8), repeating step (6)～(7) repeatedly, the number of the PHC pile tube (8) in being driven into weak soil reaches designing requirement, at this moment, all grouting pipe sections form a complete grouting pipe;
(9), continue the PHC pile tube (8) that the position is the highest with pile driver and squeeze into weak soil, until this PHC pile tube (8) top and ground level, at this moment, the piling step of the single fender post of being made up of many PHC pile tubes (8) (25) is finished;
(10), repeating step (3)～(9), at this moment, the piling step of the single fender post of being made up of many PHC pile tubes (8) (25) of another root piles with different position is finished;
(11), repeating step (10) repeatedly, finish until the piling step of all fender posts of this building foundation pit enclosure structure (25);
(12), from the bottom up in the tube wall to the junction of the PHC pile tube (8) of each layer of each rhizosphere fender pile (25), outer slip casting, and make the tube wall mutual anchoring of concrete outward of the outer concrete of the tube wall of junction of PHC pile tube (8) of each layer of each rhizosphere fender pile (25) and the junction of the PHC pile tube (8) of same one deck of adjacent fender post (25), all the outer mutual anchoring of concrete of the tube wall of the junction of the PHC pile tube (8) of each layer of fender post (25) is the concrete tabula (24) of this layer, at this moment, the construction of the fender post of building foundation pit enclosure structure (25) is finished;
(13), pour into a mould capping beam (26) and support (27) in the cast capping beam between capping beam (26) on each fender post (25) top;
(14), at each fender post (25) arranged outside water-stop curtain;
(15), excavation pit, until the height that excavates a certain layer concrete tabula (24), enclose purlin (28), and enclose support (29) purlin in enclosing between the purlin (28) cast in the inboard cast of concrete tabula (24);
(16), continue excavation pit to following one deck that sets in advance and enclose the absolute altitude of purlin (28), and this layer to enclose purlin (28) contour with a certain layer concrete tabula (24), continue enclosing purlin (28) and enclosing support (29) in the purlin of this layer of cast;
(17), repeating step (16) repeatedly, enclosing purlin (28) and enclosing and support (29) cast in the purlin and finish until minimum one deck.
4. the job practices of rearmounted tabula formula building foundation pit enclosure structure according to claim 3, it is characterized in that: connector (7) is the structure that roughly is dumbbell shaped that is made of the waist (7.2) that contracts in the head (7.1) at two ends and the centre, the external diameter of the head (7.1) of connector (7) is slightly less than the internal diameter of PHC pile tube (8), the length of the waist (7.2) of connector (7) is not more than the twice of length of the short slot (6) of every PHC pile tube (8) one ends, connector (7) is through with a through hole (9) along axis, the two ends of through hole (9) are arranged with two unidirectional funnels (10) that can only flow to osculum from big mouth, and the osculum of each unidirectional funnel (10) is positioned at connector (7) the inner; This connector (7) is fixed with the steel wing plate (11) that four block lengths equate with connector (7) waist (7.2), four blocks of steel wing plates (11) run through the tube wall of waist (7.2) and evenly distribute along the circumference of waist (7.2), every block of steel wing plate (11) is provided with the first passage (12) that connects width, connect the second channel (13) of thickness direction and the third channel (23) of perforation thickness direction, first passage (12) and second channel (13) are interconnected, first passage (12) and third channel (23) are interconnected, and the inlet of first passage (12) is positioned at the through hole (9) of connector (7).
5. the job practices of rearmounted tabula formula building foundation pit enclosure structure according to claim 4, it is characterized in that: make the highest two PHC pile tubes (8) in position circumferentially be meant the location by connector (7), a connector (7) is placed the top of the PHC pile tube (8) that exposes ground, again with hanging device with the top of another root PHC pile tube (8) handling to the PHC pile tube (8) that exposes ground, make the steel wing plate (11) of alignment of two pile tubes and connector (7) be positioned at, down in the short slot (6) of two PHC pile tubes (8), two outlets of the second channel (13) of every block of steel wing plate this moment (11) are positioned at the inwall of PHC pile tube (8) and the slit between connector (7) waist (7.2) outer wall, and the outlet of the first passage (12) of every block of steel wing plate (11) and two outlets of third channel (23) all are positioned at outside the outer wall of PHC pile tube (8).
6. the job practices of rearmounted tabula formula building foundation pit enclosure structure according to claim 5, it is characterized in that: first section that installs grouting pipe in the step (4) is meant, after the top that connector (7) is exposing the PHC pile tube (8) on ground installs, first section grout outlet of grouting pipe is inserted unidirectional funnel (10) below of through hole (9) upper end of connector (7), again another root PHC pile tube (8) is installed in the top of the PHC pile tube (8) that exposes ground, at this moment, first section top of grouting pipe is lower than the top of the highest PHC pile tube (8) in position.
7. the job practices of rearmounted tabula formula building foundation pit enclosure structure according to claim 6, it is characterized in that: another section that installs this grouting pipe in the step (6) is meant, a joint is installed on one section top at next grouting pipe highly, make the top of this joint be higher than the top of the PHC pile tube (8) that exposes ground, connector (7) in the step (6) is passed this joint, then on this joint the grouting pipe in the installation steps (6) another the section, at last, another root PHC pile tube (8) is installed on top at the PHC pile tube (8) that exposes ground, at this moment, one section top of the highest grouting pipe in position is lower than the top of the highest PHC pile tube (8) in position.
8. the job practices of rearmounted tabula formula building foundation pit enclosure structure according to claim 7, it is characterized in that: in the tube wall to the junction of the PHC pile tube (8) of each layer in the step (12), outer slip casting is meant, slurries are under the effect of unidirectional funnel (10), earlier the through hole (9) between (7) two unidirectional funnels of connector (10) is filled up, and from the inlet of first passage (12) through first passage (12), second channel (13) is filled the inwall of full PHC pile tube (8) and the slit between connector (7) waist (7.2) outer wall, simultaneously, concrete slurry flows out to the outlet of first passage (12) and two outlets of third channel (23) from the inlet of first passage (12), makes, near the outer weak soil of outer wall two PHC pile tube (8) short slots (6) is squeezed and is opened and form warty concrete (16) down;
Step is meant in (12) from the bottom up, first unidirectional funnel (10) below on connector (7) through hole (9) of lowermost layer is to the inside and outside slip casting of the tube wall of this layer junction, take out the length of a PHC pile tube of grouting pipe (8) then, make the grout outlet of grouting pipe rise to unidirectional funnel (10) below of connector (7) through hole (9) upper end of a height, again to the inside and outside slip casting of tube wall of junction of a last height, take out grouting pipe and slip casting again, finish until the inside and outside slip casting of tube wall of the junction of the PHC pile tube (8) of the highest one deck in position.
9. the job practices of rearmounted tabula formula building foundation pit enclosure structure according to claim 8 is characterized in that: a steel wing plate (11) of the connector (7) of the junction of each layer PHC pile tube (8) of every rhizosphere fender pile (25) pastes mutually with the steel wing plate (11) of adjacent fender post (25) with the connector (7) of the junction of the PHC pile tube (8) of one deck.
10. the job practices of rearmounted tabula formula building foundation pit enclosure structure according to claim 9, it is characterized in that: the cast in step (15), (16), (17) is enclosed purlin (28) and is meant, establish one in concrete tabula (24) inboard and enclose purlin (28) side template, to concrete tabula (24) with enclose slip casting between purlin (28) side template, this layer enclose purlin (28);
Step (15), (16), (17) middle cast are enclosed interior support (29) of purlin and are meant, when this layer enclose purlin (28) casting complete after, on enclosing purlin (28), need to be provided with the position of enclosing support (29) in the purlin and knock concrete open, expose that piece steel wing plate (11) that is anchored at the connector (7) that encloses in the purlin (28) by the foundation ditch inboard, go up welding at this steel wing plate (11) again and enclose the reinforcing cage that supports (29) in the purlin, lay this then and enclose two side templates that support (29) in the purlin, cast at last, this layer enclose the interior support of purlin (29).
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| CN 201110054205 CN102182192A (en) | 2011-03-01 | 2011-03-01 | Rear transverse septum type building foundation pit enclosure structure and construction method |
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Application publication date: 20110914 |