CN103469801B - Method for constructing foundation pit enclosure structure on basis of prefabricated ground walls - Google Patents
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Abstract
The invention discloses a method for constructing a foundation pit enclosure structure on the basis of prefabricated ground walls. The method includes constructing guide walls; performing grooving construction; positioning section steel; hoisting the prefabricated ground walls; splicing the ground walls; pouring concrete into holes; grouting width gaps. The method is characterized in that the prefabricated ground walls are hoisted and arranged into grooves while being spliced in a contraction site, and are connected with one another to form an integral ground wall in place, the concrete is secondarily poured in the prefabricated walls, and the width gaps are grouted, so that the width of the formed foundation pit enclosure structure meets design requirement, water seepage on wall surfaces of the formed foundation pit enclosure structure is prevented, and the formed foundation pit enclosure structure is favorable for constructing a 'two-wall-integrated' permanent structure. The method has the advantages that construction difficulty due to uncertain factors in a construction procedure is reduced, the construction quality is improved, the construction period is shortened, the construction cost is saved, and the service life of underground engineering is guaranteed.
Description
Technical field
The invention belongs to technical field of building construction, specifically just relate to a kind of foundation pit enclosure structure construction method based on prefabricated ground wall, construction safety and the construction quality of ground circummure protection structure can be improved, reduce difficulty of construction, saved construction cost.
Background technology
In recent years along with the development of Metro Construction, base pit engineering is increasing number not only, and towards more greatly, darker future development.Due to base pit engineering be everlasting business district construction, not only to ensure the stability and safety of foundation ditch self, and the surface settlement of foundation ditch periphery will be controlled, guarantee that the sedimentation of surrounding formations does not have influence on the normal use of neighboring buildings pipeline and structure.Underground exterior-protected structure form conventional at present has: diaphragm wall, castinplace pile, shaped steel Soil-cement Wall (as the stake of SMW engineering method, TRD engineering method diaphragm wall) etc.
Diaphragm wall with vibrate in its construction little, noise is low, the rigidity of body of wall is large, be applicable to multiple formation condition (from the alluvium of weakness to hard stratum, closely knit sandy gravel stratum, weak rock etc. thus ground can construct) etc. advantage be widely used in subway engineering and other deep-foundation pit engineerings.The development of diaphragm wall experienced by two stages at present, single go along with sb. to guard him sealing active phase and superimposed circummure protection structure stage i.e. " Two walls unite as one " overall force structure stage respectively, because ground wall is widely used in multiple different stratum, in work progress, long-term insoluble quality " common fault " and technical barrier are also constantly exposed to the stratum that some geological conditionss are poor, as landslip of the sides of the trench, wall percolating water etc.
Two courses that diaphragm wall development experiences:
(1) singlely sealing active phase is gone along with sb. to guard him.
The composite wall retaining design generally adopted in current work progress is exactly a kind of single sealing retaining design, and composite wall refers to and arranges waterproofing course separation layer between space enclosing structure and main body liner, forms integral sealing form with the top of structure, base plate waterproofing.
Combined type ground wall ubiquity problem in work progress has: the percolating water of 1 zero ground wall seam crossings; 2 zero, due in composite construction system, go along with sb. to guard him the main body as pattern foundation pit supporting structure, are temporary structures, and not as a part for agent structure, cost is relatively high.
(2) superimposed circummure protection structure stage i.e. " Two walls unite as one " stage.
Superimposed wall system refers to and does not arrange waterproofing course separation layer between space enclosing structure and main body liner, be by utilize between space enclosing structure with liner agent structure reinforcing bar connector be connected superimposed after both be considered as integral wall, form the overall structure of " Two walls unite as one ", structure reasonable in be a kind of technological progress.The connected mode that superposed type ground wall is commonly used at present is " embedded bar connector method ", namely first a connector is processed, we are referred to as connector, inner surface car has reverse screw thread, and the end reinforced also car of end reinforced and underground construction internals in the diaphragm wall be connected has screw thread, when connector is tightened by certain direction, just both bar connecting can be got up.
The feature having self of " Two walls unite as one " superimposed wall, it shows:
1) advantage of " Two walls unite as one " superimposed wall:
Iterative structure formula in view of composite construction retaining design can not as a part for permanent structure, infrastructure cost is higher, a kind of process of innovation and development.No matter superposition mode is economically or stressed, the distortion of general structure and waterproof, be all better than composite wall structure, therefore underground deep foundation ditch ground circummure protection structure adopts the more and more of superposed type ground wall construction.
2) " Two walls unite as one " superimposed wall Problems existing:
Because wall construction in ground is that field fabrication reinforcing cage installs connector, precision controlling is poor, affects end product quality.Show from the investigation result of site operation, the installation ubiquity problem of reinforcing bar connector, as destroyed the generation quality of connection problems such as connector in location uneven, the deflection of height and silk tooth destructions, the corrosion of silk tooth, concrete chisel removal process; And owing to being provided with the connector be connected with agent structure in a large number in the reinforcing cage of diaphragm wall, and the spacing of arranging is less, mostly be concentrate in an aspect, concrete aggregate is difficult to be filled between two-layer connector, causes concrete leakiness and to produce percolating water phenomenon comparatively general.Because superimposed work progress existing problems are more, require high to job execution troop.
For above-mentioned " Two walls unite as one " connector connectivity problem, cause the pay abundant attention of on-the-spot associated specialist, and take corresponding technical improvements and applied for corresponding technical patent, as Chinese patent CN101058977, CN101058978, CN201027307, it is also proposed the control method of process.Prior art is significantly improved to the quality that connector is installed to a certain extent, improves the quality of construction of diaphragm wall.But because process does not have the change of matter, iterative structure engineering requires still very high to the operation technical ability Absent measures of unit in charge of construction, therefore, superimposed wall technique does not fundamentally solve institute's problems faced in construction of diaphragm wall process, and the development of diaphragm wall still needs to find new resolving ideas.
Summary of the invention
For existing subterranean excavation ground circummure protection structure complicated construction technique, difficulty of construction is large, cost is high, easy technological deficiency infiltration occurring and even caves in, the invention provides a kind of foundation pit enclosure structure construction method based on prefabricated ground wall, and subterranean excavation ground circummure protection structure difficulty of construction is reduced, workmanship improves, construction costs reduces, and the duration shortens, and solves the difficult problem in current subterranean excavation ground circummure protection structure building course.Technical scheme
In order to realize above-mentioned technical purpose, the present invention designs a kind of prefabricated ground wall of batch production and the construction method of this ground circummure protection structure, and it is characterized in that, it comprises following step:
(1) construction of guide wall, before continuous wall trench underground, should construct and lead wall, is mainly used in the location of diaphragm wall and prevents cell wall from caving in.
Lead wall many employings monolithic reinforced concrete structure, also have steel or prefabricated reinforced concrete fabricated construction, can for repeatedly;
(2) trenching construction, trenching construction, after construction of guide wall completes, just can carry out trenching construction, grooving be used for prefabricated ground wall assembled enter groove meet space enclosing structure construct needs.
Trenching construction is relative to the cast in situs construction technology generally adopted at present, and simplify the operations such as hole, brush wall, lifting clearly, the phenomenon of trenching construction process collapse hole can reduce.Ensure that the construction quality of ground wall to a certain extent.The key point of trenching construction is the control of the degree of depth of grooving;
(3) shaped steel location, after grooving operation completes, inserts shaped steel by design pitch and positions in groove section, and hangs position under utilizing insertion shaped steel to control hoisting prefabricated ground wall.
Whether accurately the location of prefabricated ground wall is the key link of construction, the quality of location directly impact ground wall construction, and position error may cause ground wall percolating water, impact the ground verticality of wall and the construction quality of integrally wall.Therefore, after grooving operation completes, adopt the shaped steel location of coupling.Adopt and insert shaped steel in advance according to the spacing of designing requirement in the grooving of ground wall, then utilize shaped steel to locate and hang in prefabricated ground wall.Shaped steel is utilized not only to facilitate the location of lower floor's wall, and the location of upper walls more easy to control;
(4) prefabricated ground wall lifting, utilizes the shaped steel in step 3 to locate, guides and hung in grooving along shaped steel by prefabricated ground wall.
When prefabricated ground wall is produced, reserved 4 lifting locating holes, utilize locating hole by the rotation of the screw rod on assembled fixed mount, head in fixing hole, make it ride on guide groove temporarily, be convenient to the splicing of upper and lower prefabricated ground wall.And utilizing channel-section steel to weld a mast-up, prefabricated ground wall and mast-up adopt screw rod to rotate and dock, and wherein bolt connects and the same locating hole of lifting location employing;
Before the lifting of prefabricated ground wall, be similar to the assembled of the interval shield duct piece in underground, power transmission liner is pasted in advance at the anchor ring of prefabricated ground wall and the vertical face of dry wall, concrete and concrete directly contact when preventing splicing and damaged, uniform force when making to splice up and down, and play certain water proof, the function of antiseepage.
(5) some pieces of prefabricated ground walls are docked assembled formation one width ground wall by designing requirement by wall splicing up and down;
Detailed process is: 1) prefabricated ground wall is sling, and hole is aimed at the shaped steel axis of guide, transfers on installing rack along shaped steel, utilizes the fixing first joint wall of four set bolts on installing rack;
2) second section prefabricated ground wall is lifted by crane, save requirement by head to transfer and the wall alignment of first joint prefabricated ground, utilize and to save land wall to wearing the assembled second section of bolt and head, assembled complete after first joint continuation is closed to second section under hang, make the assembled fixing hole that second saves land wall, be fixed on installing rack;
3) by above-mentioned joining method, some pieces of prefabricated ground walls are docked assembling construction up and down by designing requirement, finally by fixing by design elevation requirement for view picture ground wall, described prefabricated ground wall spacing 30 ~ 50mm between horizontal direction in grooving.
(6) concreting in hole: complete ground wall assembled after, secondary grouting in the hole should carrying out prefabricated ground wall, makes shaped steel and prefabricated ground wall be integrated, raising integral rigidity, space at the bottom of substantial wall;
(7) width gap slip casting, utilizes sleeve valve barrel grouting method by prefabricated sleeve valve barrel grouting within the walls, and prevent the wall seam crossing infiltration of prefabricated ground, the space under fill up ground wall working face, ensures the globality of ground wall, continuity and uniformity.
Further, paste power transmission liner in described step 4 in the vertical face of the anchor ring of prefabricated ground wall and dry wall, when preventing splicing, two pieces of prefabricated ground walls directly contact and damaged, uniform force when making to splice up and down, and the effect playing water proof, antiseepage.
For above-mentioned based on the special precast ground wall in the foundation pit enclosure structure construction method of prefabricated ground wall, it is characterized in that: it comprises ground wall body, described ground wall body is cube structure, the tapered boss of platform is stretched out in described cube length sides side, symmetrical side falls in the tapered groove of platform, described boss is corresponding with groove topography, described cube vertically has secondary and builds concrete, cube is built vertical direction on the body of wall between concrete with outer wall at secondary and is evenly had bolt and dock assembled hole, described secondary is built vertical direction on the body of wall between concrete and outer wall and is embedded with some stiffener skeletons,
On the body wall of described body of wall, side is embedded with connector;
The described secondary body of wall of building between concrete and outer wall is positioned at boss side and is provided with sealing injected hole;
Described ground wall body sidewall is provided with assembled hole and lifting locating hole;
The ground wall body sidewall that described sealing injected hole is corresponding has sleeve valve barrel grouting hole be in communication with the outside.
Further, wall body in described ground is that concreting makes.
Further, described assembled hole and each at least 4 of lifting locating hole, be evenly distributed on prefabricated ground wall body outer wall metope.
Beneficial effect
The present invention adopts prefabricated ground wall to carry out the construction of subterranean excavation space enclosing structure, due to the product that prefabricated ground wall is standardized production, reduce difficulty of construction, improve construction quality, shorten man-hour, saved construction cost, add the safety of subterranean excavation enclosed structure construction, the present invention is applied widely, and the factor that diaphragm wall is affected by geological conditions significantly reduces.
Accompanying drawing explanation
Accompanying drawing 1 is present invention process flow chart.
Wall structure schematic diagram led in the present invention by accompanying drawing 2.
Accompanying drawing 3 is trenching construction step structural representations in the present invention.
Accompanying drawing 4 is Shaped Steel positioning step structural representations of the present invention.
Accompanying drawing 5 is hoisting prefabricated ground wall step structural representations in the present invention.
Accompanying drawing 6 is ground wall splicing step structural representations in the present invention.
Accompanying drawing 7 is concreting step structural representations in mesopore of the present invention.
Accompanying drawing 8 is sleeve valve barrel grouting step structural representations in the present invention.
Accompanying drawing 9 is top views of prefabricated ground wall in the present invention.
Accompanying drawing 10 is front views of prefabricated ground wall in the present invention.
Accompanying drawing 11 is right views of prefabricated ground wall in the present invention.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention will be further described.
Embodiment
As shown in Figure 1, a kind of ground of the subterranean excavation based on prefabricated ground wall wall construction method of enclosure structure, it comprises following step:
The first step, construction of guide wall, before continuous wall trench underground, should construct and lead wall, is mainly used in the location of diaphragm wall and prevents cell wall from caving in.The quality leading wall quality directly has influence on axis and the absolute altitude control of diaphragm wall, should well construction be accomplished, guarantee width, glacing flatness and verticality accurately, lead wall many employings monolithic reinforced concrete structure, also have steel or prefabricated reinforced concrete fabricated construction, can for repeatedly; Concrete structure as shown in Figure 2.
Second step, trenching construction, after construction of guide wall completes, just can carry out trenching construction, grooving be used for prefabricated ground porthole assembled enter groove meet space enclosing structure construct needs.Trenching construction relative to the cast in situs construction technology generally adopted at present, simplify empty, brush wall, the operation such as lifting, the phenomenon of trenching construction process collapse hole can reduce.Ensure that the construction quality of ground wall to a certain extent.The key point of trenching construction is the control of the degree of depth of grooving; Concrete structure as shown in Figure 3.
3rd step, shaped steel is located, and after grooving operation completes, inserts shaped steel position in groove section by design pitch, and hangs position under utilizing insertion shaped steel to control hoisting prefabricated ground wall.
Whether accurately the location of prefabricated ground wall is the key link of construction, the quality of location directly impact ground wall construction, and position error may cause ground wall percolating water, impact the ground verticality of wall and the construction quality of integrally wall.Therefore, after grooving operation completes, adopt the shaped steel location of coupling.Adopt and insert shaped steel in advance according to the spacing of designing requirement in the grooving of ground wall, then utilize shaped steel to locate and hang in prefabricated ground wall.Shaped steel is utilized not only to facilitate the location of lower floor's wall, and the location of upper walls more easy to control; Concrete structure as shown in Figure 4.
4th step, prefabricated ground wall lifts, and utilizes the shaped steel in step 3 to locate, guides and hung in grooving along shaped steel by prefabricated ground wall.When prefabricated ground wall is produced, reserved 4 lifting locating holes, utilize locating hole by the rotation of the screw rod on assembled fixed mount, head in fixing hole, make it ride on guide groove temporarily, be convenient to the splicing of upper and lower prefabricated ground wall.And utilizing channel-section steel to weld a mast-up, prefabricated ground wall and mast-up adopt screw rod to rotate and dock, and wherein bolt connects and the same locating hole of lifting location employing;
Before the lifting of prefabricated ground wall, be similar to the assembled of the interval shield duct piece in underground, power transmission liner is pasted in advance at the anchor ring of prefabricated ground wall and the vertical face of dry wall, concrete and concrete directly contact when preventing splicing and damaged, uniform force when making to splice up and down, and play certain water proof, the function of antiseepage.Concrete structure as shown in Figure 5.
5th step, ground wall splices, and some pieces of prefabricated ground walls are docked assembled formation one width ground wall up and down by designing requirement;
Detailed process is: 1) prefabricated ground wall is sling, and hole is aimed at the shaped steel axis of guide, transfers on installing rack along shaped steel, utilizes the fixing first joint wall of four set bolts on installing rack;
2) second section prefabricated ground wall is lifted by crane, save requirement by head to transfer and the wall alignment of first joint prefabricated ground, utilize and to save land wall to wearing the assembled second section of bolt and head, assembled complete after first joint continuation is closed to second section under hang, make the assembled fixing hole that second saves land wall, be fixed on installing rack;
3) by above-mentioned joining method, some pieces of prefabricated ground walls are docked assembling construction up and down by designing requirement, finally view picture ground wall is fixed by design elevation requirement, described prefabricated ground wall spacing 30 ~ 50mm between horizontal direction in grooving, concrete structure as shown in Figure 6.
6th step, concreting in hole, complete ground wall assembled after, secondary grouting in the hole should carrying out prefabricated ground wall, makes shaped steel and prefabricated ground wall be integrated, raising integral rigidity, space at the bottom of substantial wall; Concrete structure as shown in Figure 7.
7th step, the slip casting of width gap, utilizes sleeve valve barrel grouting method by prefabricated sleeve valve barrel grouting within the walls, and prevent the wall seam crossing infiltration of prefabricated ground, the space under fill up ground wall working face, ensures the globality of ground wall, continuity and uniformity.Concrete structure as shown in Figure 8.
Wherein, as accompanying drawing 9, shown in 10 and 11, for above-mentioned based on the special precast ground wall in the foundation pit enclosure structure construction method of prefabricated ground wall, the prefabricated ground wall that described concreting makes comprises ground wall body 1, described ground wall body 1 is cube structure, the tapered boss 101 of platform is stretched out in described cube length sides side, symmetrical side falls in the tapered groove 102 of platform, described boss 101 is corresponding with groove 102 profile, described cube vertically has secondary and builds concrete 103, cube is built concrete 103 at secondary and is evenly had bolt with vertical direction on the body of wall 104 between outer wall and dock assembled hole 105, described secondary is built vertical direction on the body of wall 104 between concrete 103 and outer wall and is embedded with some stiffener skeletons 106,
On the body wall of described body of wall 104, side is embedded with connector 107;
The described secondary body of wall 104 of building between concrete 103 and outer wall is positioned at boss 101 side and is provided with sealing injected hole 108;
Described ground wall body 1 sidewall is provided with assembled hole 109 and lifting locating hole 1010;
Ground wall body 1 sidewall of described sealing injected hole 108 correspondence has sleeve valve barrel grouting hole 108a be in communication with the outside;
Described assembled hole 109 and each at least 4 of lifting locating hole 1010, be evenly distributed on prefabricated ground wall body 1 outer wall metope.
The present invention adopts prefabricated ground wall to carry out the construction of subterranean excavation space enclosing structure, because prefabricated ground wall is the product of standardized production, reduces difficulty of construction, improve construction quality, shorten man-hour, saved construction cost, add the safety of subterranean excavation enclosed structure construction.
The front, rear, left and right mentioned in the present invention are relative position; it is not the absolute position at component place; invention which is intended to be protected is not limited only to the technical scheme that the present embodiment is mentioned, and any technical scheme enlightened by the present invention all falls into protection scope of the present invention.
Claims (3)
1. based on a foundation pit enclosure structure construction method for prefabricated ground wall, it is characterized in that, it comprises following step:
(1) construction of guide wall, before continuous wall trench underground, should construct and lead wall, is mainly used in the location of diaphragm wall and prevents cell wall from caving in;
(2) trenching construction, after construction of guide wall completes, just can carry out trenching construction, grooving be used for prefabricated ground porthole assembled enter groove meet space enclosing structure construct needs;
(3) shaped steel location, after grooving operation completes, inserts shaped steel by design pitch and positions in groove section, and hangs position under utilizing insertion shaped steel to control hoisting prefabricated ground wall;
(4) prefabricated ground wall lifting, utilizes the shaped steel in step 3 to locate, guides and hang in grooving by prefabricated ground wall along shaped steel;
(5) some pieces of prefabricated ground walls are docked assembled formation one width ground wall by designing requirement by wall splicing up and down;
(6) concreting in hole, complete ground wall assembled after, secondary grouting in the hole should carrying out prefabricated ground wall, makes shaped steel and prefabricated ground wall be integrated, raising integral rigidity, space at the bottom of substantial wall;
(7) width gap slip casting, utilizes sleeve valve barrel grouting method by prefabricated sleeve valve barrel grouting within the walls, and prevent the wall seam crossing infiltration of prefabricated ground, the space under fill up ground wall working face, ensures the globality of ground wall, continuity and uniformity.
2. a kind of foundation pit enclosure structure construction method based on prefabricated ground wall as claimed in claim 1, it is characterized in that: in described step (4), paste power transmission liner at prefabricated ground wall end face, when preventing splicing, two pieces of prefabricated ground walls directly contact and damaged, uniform force when making to splice up and down, and the effect playing water proof, antiseepage.
3. a kind of foundation pit enclosure structure construction method based on prefabricated ground wall as claimed in claim 1, is characterized in that: in described step (5), some pieces of prefabricated ground walls being docked assembled process up and down by designing requirement is:
1) prefabricated ground wall is sling, and hole is aimed at the shaped steel axis of guide, transfers on installing rack along shaped steel, utilizes the fixing first joint wall of four set bolts on installing rack;
2) second section prefabricated ground wall is lifted by crane, save requirement by head to transfer and the wall alignment of first joint prefabricated ground, utilize and to save land wall to wearing the assembled second section of bolt and head, assembled complete after first joint continuation is closed to second section under hang, make the assembled fixing hole that second saves land wall, be fixed on installing rack;
3) by above-mentioned joining method, some pieces of prefabricated ground walls are docked assembling construction up and down by designing requirement, finally by fixing by design elevation requirement for view picture ground wall, described prefabricated ground wall spacing 30 ~ 50mm between horizontal direction in grooving.
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| CN104775439B (en) * | 2015-04-20 | 2017-03-15 | 中建南方投资有限公司 | A kind of pattern foundation pit supporting structure sealing integral structure and its construction method |
| CN105442614A (en) * | 2015-11-19 | 2016-03-30 | 浙江桐砚建筑规划设计有限公司 | Construction method for foundation pit support |
| CN105862990B (en) * | 2016-03-24 | 2019-05-24 | 上海市机械施工集团有限公司 | A kind of prefabrication and assembly construction shaft wall structure and its construction method |
| CN105887806B (en) * | 2016-06-13 | 2018-08-24 | 上海强劲地基工程股份有限公司 | Assembled underground continuous wall and its construction method |
| CN107956220A (en) * | 2017-11-23 | 2018-04-24 | 上海建科工程咨询有限公司 | A kind of prefabricated construction method for diaphragm walls based on TRD grooving |
| CN109056703A (en) * | 2018-09-17 | 2018-12-21 | 中国铁路设计集团有限公司 | A kind of construction method of assembled underground continuous wall |
| CN109281313A (en) * | 2018-09-27 | 2019-01-29 | 广州地铁设计研究院股份有限公司 | A kind of Prefabricated composite box diaphram wall and its construction method |
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| CN1129273A (en) * | 1995-11-01 | 1996-08-21 | 孔清华 | Technology for forming underground continuous wattled wall and apparatus thereof |
| JP3217038B2 (en) * | 1998-12-28 | 2001-10-09 | 日工建設株式会社 | Ground drilling equipment and method of forming cylindrical underground structure |
| CN1117905C (en) * | 1999-10-12 | 2003-08-13 | 许琦 | Construction method and structure of continuous underground wall of dual-layer wall |
| CN101319498B (en) * | 2008-07-17 | 2010-07-14 | 万勇 | Lattice type prefabricated prestressed underground continuous wall and its construction method |
| KR100975948B1 (en) * | 2009-11-20 | 2010-08-16 | (주)정토지오텍 | Precast diaphragm wall and it's construction technique |
| TW201200683A (en) * | 2010-06-18 | 2012-01-01 | Chang Ho Machinery Engineering Co Ltd | Static pressure implant method for precast retaining wall |
| CN202830917U (en) * | 2012-10-30 | 2013-03-27 | 福州市第三建筑工程公司 | Prefabricated press-in type underground diaphragm wall |
| CN203475439U (en) * | 2013-09-03 | 2014-03-12 | 上海建科工程咨询有限公司 | Special precast underground wall in precast underground wall based foundation pit support structure construction method |
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