CN111173036A - Deformation control method and device for horizontal beam plate supporting structure of reverse foundation pit - Google Patents
Deformation control method and device for horizontal beam plate supporting structure of reverse foundation pit Download PDFInfo
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- CN111173036A CN111173036A CN201910990048.4A CN201910990048A CN111173036A CN 111173036 A CN111173036 A CN 111173036A CN 201910990048 A CN201910990048 A CN 201910990048A CN 111173036 A CN111173036 A CN 111173036A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
- E02D29/05—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench
- E02D29/055—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench further excavation of the cross-section proceeding underneath an already installed part of the structure, e.g. the roof of a tunnel
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/16—Arrangement or construction of joints in foundation structures
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- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
The invention discloses a deformation control method and a deformation control device for a horizontal beam plate supporting structure of a reverse foundation pit, and aims to provide a deformation control method and a deformation control device for a horizontal beam plate supporting structure of a reverse foundation pit, which can effectively solve the problem that the deformation of a conventional foundation pit peripheral pile or foundation pit peripheral retaining wall into the foundation pit is overlarge under the action of the external soil pressure of the foundation pit, so that great hidden dangers are caused to the safety of the foundation pit and the safety of an external pipeline of the foundation pit. It includes peripheral fender pile of foundation ditch or the peripheral fender wall of foundation ditch and sets up the horizontal beam board in the foundation ditch, and the horizontal beam board is used for supporting the soil and water pressure that is transmitted by peripheral fender pile of foundation ditch or the peripheral fender wall of foundation ditch and comes, be provided with the post-cast strip on the horizontal beam board, separate into a plurality of regions with the horizontal beam board, be equipped with the deformation active control device in the post-cast strip, the deformation active control device includes hydraulic jack and sets up the inserted sheet formula locking support device who is used for transmitting soil and water pressure in the post-cast strip, inserted sheet formula locking support device includes a plurality of inserted sheets.
Description
Technical Field
The invention relates to a foundation pit supporting structure, in particular to a deformation control method and device for a horizontal beam plate supporting structure of a reverse foundation pit.
Background
Along with the continuous development of urban underground spaces, the plane scale and the depth of the basement are larger and larger. The newly cast concrete beam plate can shrink in the hardening process, most of the hardening shrinkage of the concrete beam plate can be completed in the first 1-2 months after construction, when the deformation of the concrete beam plate is restrained, temperature stress is generated in the structure, and cracks can be generated in the member when the deformation is serious; in order to reduce the influence of hydration heat in the basement floor concrete pouring process, in the construction process, a post-cast strip is arranged on a horizontal beam plate of the basement, the settled post-cast strip can be sealed behind the top of a main building, and the telescopic post-cast strip needs to be sealed after 2 months of concrete pouring.
The horizontal supporting structure in the reverse foundation pit bracing system generally consists of a basement horizontal beam plate and a foundation pit peripheral retaining pile or a foundation pit peripheral retaining wall, wherein the basement horizontal beam plate is positioned in the foundation pit peripheral retaining pile or the foundation pit peripheral retaining wall and is used for supporting and transmitting water and soil pressure borne by the foundation pit peripheral retaining pile or the foundation pit peripheral retaining wall. Because basement horizontal beam slab needs to bear soil and water pressure, but the post-cast strip divides horizontal beam slab into a plurality of independent blocks for soil and water pressure that foundation ditch peripheral fender pile or foundation ditch peripheral retaining wall transmitted is difficult to effectively transmit. The conventional method at present is to arrange a steel support in a post-cast strip for transmitting water and soil pressure between independent blocks. On one hand, the existing foundation pit supporting structure has huge water and soil pressure of a deep foundation pit retaining support; on the other hand, due to the long plane dimension of the basement, the shrinkage of the horizontal beam plate structure of the basement and the like, the deformation of the foundation pit peripheral retaining pile or the foundation pit peripheral retaining wall into the foundation pit is overlarge under the action of the external soil pressure of the foundation pit, and the problem of great hidden danger is caused to the safety of the foundation pit and the safety of an external pipeline of the pit; simultaneously, the shrinkage of basement horizontal beam plate structure produces additional deformation and stress in vertical members such as pile foundation and basement wall post, will also influence basement main part safety.
Disclosure of Invention
The invention aims to provide a deformation control method and device for a horizontal beam plate supporting structure of a reverse foundation pit, which can effectively solve the problem that the deformation of the conventional foundation pit peripheral retaining pile or foundation pit peripheral retaining wall into the foundation pit is overlarge under the action of the external soil pressure of the foundation pit, so that great hidden dangers are caused to the safety of the foundation pit and the safety of an external pipeline of the foundation pit.
The technical scheme of the invention is as follows:
a deformation control device for a horizontal beam plate supporting structure of a reverse construction foundation pit comprises a foundation pit peripheral pile or a foundation pit peripheral retaining wall arranged along the edge of the foundation pit and a horizontal beam plate arranged in the foundation pit, wherein the horizontal beam plate is used for supporting the foundation pit peripheral pile or the foundation pit peripheral retaining wall so as to bear soil and water pressure transmitted by the foundation pit peripheral pile or the foundation pit peripheral retaining wall; when the deformation of the foundation pit peripheral pile or the foundation pit peripheral retaining wall to the inside of the foundation pit exceeds a set value, the foundation pit peripheral pile or the foundation pit peripheral retaining wall is jacked back outwards through the hydraulic jack and inserted into the inserting piece type locking and supporting device through inserting pieces so as to eliminate gaps among the inserting pieces on the inserting piece type locking and supporting device, and therefore the inserting piece type locking and supporting device is supported in a post-cast strip and used for transmitting water and soil pressure. Therefore, the problem that the deformation in the foundation pit is too large and great hidden danger is caused to the safety of the foundation pit and the safety of the outer pipeline of the foundation pit can be solved under the action of the external soil pressure of the foundation pit by the foundation pit surrounding outer fender pile or the foundation pit surrounding fender wall.
As preferred, inserted sheet formula locking support device includes flexible sliding sleeve, the flexible direction of flexible sliding sleeve parallels with hydraulic jack's flexible direction, and flexible sliding sleeve includes inner sliding sleeve and the outer sliding sleeve of cover outside inner sliding sleeve, the end fixing of outer sliding sleeve is on the side of post-cast strip, the end fixing of inner sliding sleeve is on the another side of post-cast strip, inner sliding sleeve constitutes the inserted sheet standing groove with the cavity of outer sliding sleeve, and the opening of inserted sheet standing groove up, the inserted sheet is inserted and is established the inserted sheet standing groove, and each inserted sheet distributes along the flexible direction of flexible sliding sleeve in proper order. So, insert the inserted sheet standing groove with the inserted sheet in convenient actual work to eliminate the piece formula compensation and warp the clearance between each inserted sheet on the locking device.
Preferably, the deformation active control device further comprises an upper pressure plate, a lower support plate positioned below the upper pressure plate, a lower support plate connecting plate connected with the upper pressure plate, a floating plate positioned above the lower support plate, a vertical guide hole arranged on the lower support plate, a vertical guide rod slidably arranged in the vertical guide hole, a compression spring sleeved on the vertical guide rod, a vertical support rod fixed on the ejector rod of the hydraulic jack, and a roller arranged at the lower end of the vertical support rod, wherein the upper end of the vertical guide rod is connected with the floating plate, the lower end of the vertical guide rod is provided with a lower limit block, the compression spring is positioned between the lower support plate and the floating plate, the floating plate is positioned below the roller, the upper surface of the floating plate is a support inclined surface, the roller is supported on the support inclined surface, and the insert comprises a plurality of inner inserts and a plurality of compensation inserts which are supported on the, the gap between any two adjacent inner inserting pieces forms a wedging groove, the two opposite side surfaces of the wedging groove are inner wedge surfaces, the distance between the two inner wedge surfaces of the wedging groove is gradually increased from bottom to top, the compensation inserting pieces are inserted into the wedging groove in a one-to-one correspondence manner, the side surfaces of the compensation inserting pieces are outer wedge surfaces matched with the inner wedge surfaces, and the upper ends of the compensation inserting pieces are positioned above the wedging groove; the upper pressure plate is positioned above the compensation insertion sheets, and the upper pressure plate is supported on the upper ends of the compensation insertion sheets.
According to the insert piece structure, in the process that a hydraulic jack jacks a foundation pit peripheral pile or a foundation pit peripheral retaining wall outwards back, an ejector rod of the hydraulic jack extends outwards, and a roller moves outwards along with the ejector rod, in the process, the roller presses a floating plate downwards through a supporting inclined plane, so that a lower supporting plate is driven to press downwards through a compression spring, the lower supporting plate drives an upper supporting plate to press downwards through a connecting plate, and a compensation insert piece is pressed into a wedging groove, so that the problem that the compensation insert piece cannot fall down due to the fact that the compensation insert piece is adhered to one inner insert piece under the action of the external soil pressure of a foundation pit for a long time is solved; meanwhile, the compensation insertion pieces are pressed into the wedging groove by downward pressing of the upper supporting plate, so that gaps among the insertion pieces can be eliminated, and the outer wedge surfaces of the compensation insertion pieces are abutted against the inner wedge surfaces of the wedging groove; therefore, a new inserting plate is inserted between the inserting plates without manual operation, the gap between the inserting plates can be effectively eliminated, and the outer wedge surfaces of the compensating inserting plates are abutted against the inner wedge surfaces of the wedging grooves, so that the inserting plate type locking and supporting device can form reliable and stable support in a post-pouring belt to transmit water and soil pressure.
therefore, after the compensating inserting sheet is pressed into the wedging groove and the outer wedge surface of the compensating inserting sheet is abutted against the inner wedge surface of the wedging groove, the self-locking function is realized between the compensating inserting sheet and the inner inserting sheet, after the hydraulic jack releases pressure, each inserting sheet can reliably support and transmit water and soil pressure outside the foundation pit, and the compensating inserting sheet is prevented from sliding upwards along the inner wedge surface due to the water and soil pressure outside the foundation pit.
Preferably, a plurality of deformation active control devices are arranged in the same post-cast strip.
Preferably, the post-cast strips are distributed in a crisscross manner, and each post-cast strip is provided with a plurality of the deformation active control devices.
Preferably, the steel bars in the horizontal beam plates at the two sides of the post-cast strip extend into the post-cast strip, and the steel bars extending into the post-cast strip on the horizontal beam plates at the two sides of the post-cast strip are not connected with each other.
Preferably, support piers corresponding to the deformation active control devices one by one are arranged on one side wall of the post-cast strip, and the deformation active control devices are located between the corresponding support piers and the other side wall of the post-cast strip.
Preferably, the same deformation active control device comprises two insert type locking and supporting devices, and the hydraulic jack is positioned between the two insert type locking and supporting devices.
A deformation control method for a horizontal beam plate supporting structure of a reverse foundation pit sequentially comprises the following steps:
firstly, constructing foundation pit peripheral retaining piles or foundation pit peripheral retaining walls on the periphery of a basement;
secondly, excavating a soil body in the basement range, and synchronously monitoring the deformation of a foundation pit peripheral retaining pile or a foundation pit peripheral retaining wall to the inside of the foundation pit; when the designed underground layer elevation is excavated, a horizontal beam plate of the underground layer is poured, the horizontal beam plate is used for supporting a foundation pit peripheral pile or a foundation pit peripheral retaining wall so as to bear water and soil pressure transmitted by the foundation pit peripheral pile or the foundation pit peripheral retaining wall, and a post-pouring belt is arranged on the horizontal beam plate while the horizontal beam plate is poured so as to divide the horizontal beam plate into a plurality of areas;
thirdly, arranging a deformation active control device in the post-cast strip, wherein the deformation active control device comprises a hydraulic jack and an inserting piece type locking and supporting device which is arranged in the post-cast strip and used for transmitting water and soil pressure, and the inserting piece type locking and supporting device comprises a plurality of inserting pieces; in the process of excavating the soil body in the basement range, when the deformation of the foundation pit peripheral pile or the foundation pit peripheral retaining wall into the foundation pit exceeds a set value, the foundation pit peripheral pile or the foundation pit peripheral retaining wall is jacked back outwards through a hydraulic jack and inserted into the insert type locking and supporting device through inserts so as to eliminate gaps among inserts on the insert type locking and supporting device, so that the insert type locking and supporting device is supported in a post-cast strip and used for transmitting water and soil pressure;
fourthly, continuing to excavate the soil body downwards, and implementing the second step and the third step.
The invention has the beneficial effects that: the problem that the deformation in the foundation pit is too large and great hidden danger is caused to the safety of the foundation pit and the safety of the outer pipeline of the foundation pit can be avoided under the action of the external soil pressure of the foundation pit by the foundation pit surrounding outer fender pile or the foundation pit surrounding retaining wall.
Drawings
Fig. 1 is a top view of a deformation control device for a horizontal beam plate support structure of a reverse foundation pit according to the present invention.
Fig. 2 is a partial structural view of the post-cast strip at the deformation compensating support structure according to the first embodiment of the present invention.
Fig. 3 is a schematic view of a partial structure at a deformation compensating support structure according to a first embodiment of the invention.
3 fig. 34 3 is 3 a 3 partial 3 schematic 3 view 3 of 3 a 3 portion 3 of 3 fig. 33 3 at 3 a 3- 3 a 3. 3
Fig. 5 is a schematic structural view of the inner sliding sleeve of the deformation compensation supporting structure according to the first embodiment of the invention.
Fig. 6 is a partial structural view of a deformation compensation support structure according to a third embodiment of the present invention.
Fig. 7 is a partial schematic view of fig. 6 at B-B.
Fig. 8 is a partial schematic view of a portion of fig. 6 at C-C.
In the figure:
a foundation pit peripheral pile 1;
a horizontal beam plate 2;
a support pier 4;
a reinforcing steel bar 5;
deformation active control device 6:
the hydraulic jack (6.1) is provided with a hydraulic jack,
the anchor plate 6.2 is provided with a plurality of anchor plates,
the plug-in sheet type locking support device comprises a plug-in sheet type locking support device 6.3, a wedging groove 6.30, a plug-in sheet 6.31, an inner sliding sleeve 6.32, a plug-in sheet placing groove 6.321, an outer sliding sleeve 6.33, support profile steel 6.34, an inner plug-in sheet 6.35, a compensation plug-in sheet 6.36, an inner wedge surface 6.37, an outer wedge surface 6.38, an upper pressure plate 6.39, a lower support plate 6.310, a lower support plate connecting plate 6.311, an ejector rod 6.312, a floating plate 6.313, a vertical support rod 6.314, a roller 6.315, a vertical guide rod 6.316, a compression spring 6.317, a lower limit block 6.318 and a support inclined surface 6.319.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention are clearly explained and illustrated below with reference to the accompanying drawings, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present scheme, and are not construed as limiting the scheme of the present invention.
These and other aspects of embodiments of the invention will be apparent with reference to the following description and attached drawings. In the description and drawings, particular embodiments of the invention have been disclosed in detail as being indicative of some of the ways in which the principles of the embodiments of the invention may be practiced, but it is understood that the scope of the embodiments of the invention is not limited thereby. On the contrary, the embodiments of the invention include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.
In the description of the present invention, it is to be understood that the terms "thickness", "upper", "lower", "horizontal", "top", "bottom", "inner", "outer", "circumferential", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., and "several" means one or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral connections, either mechanical or electrical, or communicating with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The first embodiment is as follows: as shown in fig. 1, 2, 3, and 4, the deformation control device for the horizontal beam plate supporting structure of the reverse foundation pit comprises a foundation pit peripheral pile 1 arranged along the edge of the foundation pit and a horizontal beam plate 2 arranged in the foundation pit, wherein the horizontal beam plate is used for supporting the foundation pit peripheral pile or the foundation pit peripheral retaining wall so as to bear soil and water pressure transmitted by the foundation pit peripheral pile or the foundation pit peripheral retaining wall. Of course, the foundation pit peripheral pile in the embodiment may be replaced by a foundation pit peripheral retaining wall. The horizontal beam plate is provided with a post-cast strip 3 which divides the horizontal beam plate into a plurality of areas.
And a deformation active control device 6 is arranged in the post-cast strip, the deformation active control device comprises a hydraulic jack 6.1 and an inserting piece type locking and supporting device 6.3 which is arranged in the post-cast strip and used for transmitting water and soil pressure, and the hydraulic jack is used for jacking horizontal beam plates on two sides of the post-cast strip.
As shown in fig. 2, fig. 3, fig. 4 and fig. 5, the tab type locking and supporting device 6.3 includes a telescopic sliding sleeve and a plurality of tabs 6.31. The telescopic direction of the telescopic sliding sleeve is parallel to the telescopic direction of the hydraulic jack. The telescopic sliding sleeve comprises an inner sliding sleeve 6.32 and an outer sliding sleeve 6.33 sleeved outside the inner sliding sleeve. The end part of the outer sliding sleeve is fixed on one side surface of the post-cast strip, and the end part of the inner sliding sleeve is fixed on the other side surface of the post-cast strip. The cavity of inner sliding sleeve and outer sliding sleeve constitutes inserted sheet standing groove 6.321, and the opening of inserted sheet standing groove is up. The inserted sheet is inserted and is established at the inserted sheet standing groove, and each inserted sheet distributes along the flexible direction of telescopic sliding sleeve in proper order. In the embodiment, the inserting pieces are parallel to each other, and two opposite side surfaces of the same inserting piece are parallel to each other; the thickness of each insert sheet can be the same or different.
When the deformation of the foundation pit peripheral retaining pile or the foundation pit peripheral retaining wall into the foundation pit exceeds a set value, the set value is 20 cm in the embodiment; the foundation pit peripheral pile or the foundation pit peripheral retaining wall is jacked back outwards through a hydraulic jack so as to reduce horizontal displacement of the foundation pit peripheral pile into the foundation pit or enable the foundation pit peripheral pile to return; then, the inserting pieces are inserted into the inserting piece type locking and supporting device, specifically, one or more inserting pieces are inserted into gaps among the inserting pieces of the inserting piece type locking and supporting device, so that the gaps among the inserting pieces on the inserting piece type locking and supporting device are eliminated (the retaining piles at the periphery of the locking foundation pit are restored to be deformed), and the inserting piece type locking and supporting device can form reliable and stable support in a post-cast strip so as to transmit water and soil pressure. Therefore, the problem that the deformation in the foundation pit is too large and great hidden danger is caused to the safety of the foundation pit and the safety of the outer pipeline of the foundation pit can be solved under the action of the external soil pressure of the foundation pit by the foundation pit surrounding outer fender pile or the foundation pit surrounding fender wall.
Further, as shown in fig. 3, the same deformation active control device includes two insert type locking support devices, and the hydraulic jack is located between the two insert type locking support devices.
Further, as shown in fig. 1, a plurality of active deformation control devices are arranged in the same post-cast strip 3.
Further, as shown in fig. 1, the post-cast strips 3 are distributed in a crisscross manner, and each post-cast strip is provided with a plurality of the active deformation control devices.
Further, as shown in fig. 2, the reinforcing bars 5 in the horizontal beam plates 2 on both sides of the post-cast strip 3 extend into the post-cast strip, and the reinforcing bars extending into the post-cast strip on the horizontal beam plates on both sides of the post-cast strip are not connected to each other. Before the concrete is cast in the post-cast strip, the steel bars extending into the post-cast strip on the horizontal beam plates positioned on the two sides of the post-cast strip are connected by welding.
Further, as shown in fig. 1, 3 and 4, one side wall of the post-cast strip is provided with support piers 4 corresponding to the deformation active control devices one by one, and the deformation active control devices are located between the corresponding support piers and the other side wall of the post-cast strip.
Further, as shown in fig. 3 and 4, the active deformation control device further comprises two anchor plates 6.2, wherein one anchor plate is fixed on the supporting pier, and the other anchor plate is fixed on the other side wall of the post-cast strip. The end part of the outer sliding sleeve is fixed on one of the anchor plates, and the end part of the inner sliding sleeve is fixed on the other anchor plate. Thus, the actual installation operation of the deformation active control device is facilitated.
Furthermore, as shown in fig. 3 and 4, the insert placing groove is internally provided with supporting section steel 6.34, one end of the supporting section steel is supported on the anchor plate at the end part of the outer sliding sleeve, and the other end of the supporting section steel extends into the cavity of the inner sliding sleeve. The inserted sheet is located between the anchor plate of support shaped steel and inner sliding sleeve. Thus, the number of the insert pieces can be reduced.
The second embodiment is as follows: a deformation control method for a horizontal beam plate supporting structure of a reverse foundation pit sequentially comprises the following steps:
firstly, constructing foundation pit peripheral retaining piles or foundation pit peripheral retaining walls on the periphery of a basement;
secondly, excavating a soil body in the basement range, and synchronously monitoring the deformation of a foundation pit peripheral retaining pile or a foundation pit peripheral retaining wall to the inside of the foundation pit; when the designed underground layer elevation is excavated, a horizontal beam plate of the underground layer is poured, the horizontal beam plate is used for supporting a foundation pit peripheral pile or a foundation pit peripheral retaining wall so as to bear water and soil pressure transmitted by the foundation pit peripheral pile or the foundation pit peripheral retaining wall, and a post-pouring belt is arranged on the horizontal beam plate while the horizontal beam plate is poured so as to divide the horizontal beam plate into a plurality of areas;
thirdly, arranging a deformation active control device in the post-cast strip, wherein the deformation active control device comprises a hydraulic jack and an inserting piece type locking and supporting device which is arranged in the post-cast strip and used for transmitting water and soil pressure, and the inserting piece type locking and supporting device comprises a plurality of inserting pieces; in the process of excavating the soil body in the basement range, when the deformation of the foundation pit peripheral retaining pile or the foundation pit peripheral retaining wall to the inside of the foundation pit exceeds a set value, the set value is 20 cm in the embodiment; the foundation pit peripheral pile or the foundation pit peripheral retaining wall is jacked back outwards through a hydraulic jack so as to reduce horizontal displacement of the foundation pit peripheral pile into the foundation pit or enable the foundation pit peripheral pile to return; then, the inserting pieces are inserted into the inserting piece type locking and supporting device, specifically, one or more inserting pieces are inserted into gaps among the inserting pieces of the inserting piece type locking and supporting device, so that the gaps among the inserting pieces on the inserting piece type locking and supporting device are eliminated (the retaining piles at the periphery of the locking foundation pit are restored to be deformed), and the inserting piece type locking and supporting device can form reliable and stable support in a post-cast strip so as to transmit water and soil pressure. Therefore, the problem that the deformation in the foundation pit is too large and great hidden danger is caused to the safety of the foundation pit and the safety of the outer pipeline of the foundation pit can be solved under the action of the external soil pressure of the foundation pit by the foundation pit surrounding outer fender pile or the foundation pit surrounding fender wall. The specific structure and arrangement of the active deformation control device according to the present embodiment are described with reference to the active deformation control device according to the first specific embodiment;
fourthly, continuously excavating the soil body downwards, and implementing the second step and the third step.
The third concrete embodiment: as shown in fig. 1, the deformation control device for the horizontal beam plate supporting structure of the reverse construction foundation pit comprises a foundation pit peripheral pile 1 arranged along the edge of the foundation pit and a horizontal beam plate 2 arranged in the foundation pit, wherein the horizontal beam plate is used for supporting the foundation pit peripheral pile or the foundation pit peripheral retaining wall so as to bear soil and water pressure transmitted by the foundation pit peripheral pile or the foundation pit peripheral retaining wall. Of course, the foundation pit peripheral pile in the embodiment may be replaced by a foundation pit peripheral retaining wall. The horizontal beam plate is provided with a post-cast strip 3 which divides the horizontal beam plate into a plurality of areas. And a deformation active control device 6 is arranged in the post-cast strip.
As shown in fig. 1 and 6, the active deformation control device comprises a hydraulic jack 6.1 and an insert type locking and supporting device 6.3 arranged in the post-cast strip and used for transmitting water and soil pressure, wherein the hydraulic jack is used for jacking horizontal beam plates on two sides of the post-cast strip.
As shown in fig. 6 and 7, the tab type locking and supporting device 6.3 includes a telescopic sliding sleeve and a plurality of tabs 6.31. The telescopic direction of the telescopic sliding sleeve is parallel to the telescopic direction of the hydraulic jack. The telescopic sliding sleeve comprises an inner sliding sleeve 6.32 and an outer sliding sleeve 6.33 sleeved outside the inner sliding sleeve. The end part of the outer sliding sleeve is fixed on one side surface of the post-cast strip, and the end part of the inner sliding sleeve is fixed on the other side surface of the post-cast strip. The cavity of inner sliding sleeve and outer sliding sleeve constitutes inserted sheet standing groove 6.321, and the opening of inserted sheet standing groove is up. The inserted sheet is inserted and is established at the inserted sheet standing groove, and each inserted sheet distributes along the flexible direction of telescopic sliding sleeve in proper order.
As shown in fig. 6, 7, and 8, the active deformation control device 6 further includes an upper press plate 6.39, a lower support plate 6.310 located below the upper press plate, a lower support plate connection plate 6.311 connected to the upper press plate, a floating plate 6.313 located above the lower support plate, a vertical guide hole disposed on the lower support plate, a vertical guide rod 6.316 slidably disposed in the vertical guide hole, a compression spring 6.317 sleeved on the vertical guide rod, a vertical support rod 6.314 fixed on an ejection rod 6.312 of the hydraulic jack, and a roller 6.315 disposed at a lower end of the vertical support rod. The upper end of the vertical guide rod is connected with the floating plate, and the lower end of the vertical guide rod is provided with a lower limit block 6.318. The compression spring is positioned between the lower support plate and the floating plate. The floating plate is located below the roller, and the upper surface of the floating plate is a support slope 6.319 which is inclined upward in the extending direction of the ejector rod of the hydraulic jack. The roller is supported on the supporting inclined plane.
The insert sheet 6.31 comprises a number of insert sheets 6.35 supported on the bottom surface of the insert sheet placement groove and a number of compensating insert sheets 6.36. The clearance between any two adjacent inner inserting sheets forms a wedge groove 6.30. The opposite two side surfaces of the wedging groove are both inner wedge surfaces 6.37, the distance between the two inner wedge surfaces of the wedging groove is gradually increased from bottom to top, and in the embodiment, the two inner wedge surfaces of the wedging groove have the same inclination angle. The compensation inserting sheets are inserted into the wedging grooves in a one-to-one correspondence manner. The side surface of the compensation inserting sheet is an outer wedge surface 6.38 matched with the inner wedge surface, and specifically, the two opposite side surfaces of the compensation inserting sheet are outer wedge surfaces matched with the corresponding inner wedge surfaces. The inclined angles of the outer wedge surface and the inner wedge surface are the same. The upper end of the compensation inserting sheet is positioned above the wedging groove. The upper pressure plate is positioned above the compensation inserting pieces and is supported on the upper ends of the compensation inserting pieces.
in the embodiment, the corresponding equivalent friction angle between the outer tapered wedge surface of the compensation insertion sheet and the inner tapered wedge surface of the wedging groove is 15 degrees, and the inclination angle α of the outer tapered wedge surface of the compensation insertion sheet is 2-5 degrees.
When the deformation of the foundation pit peripheral retaining pile or the foundation pit peripheral retaining wall into the foundation pit exceeds a set value, the set value is 20 cm in the embodiment; the foundation pit peripheral pile or the foundation pit peripheral retaining wall is jacked back outwards through a hydraulic jack so as to reduce horizontal displacement of the foundation pit peripheral pile into the foundation pit or enable the foundation pit peripheral pile to return; inserting the inserting pieces into the inserting piece type locking and supporting device, specifically, pressing the compensating inserting pieces into the wedging grooves to enable the outer wedge surfaces of the compensating inserting pieces to abut against the inner wedge surfaces of the wedging grooves so as to eliminate gaps among the inserting pieces (locking the retaining piles at the periphery of the foundation pit to restore and deform); in the embodiment, the foundation pit peripheral pile or foundation pit peripheral retaining wall is jacked back outwards through the hydraulic jack, the jacking rod of the hydraulic jack extends outwards, the roller moves outwards along with the jacking rod, in the process, the roller presses the floating plate downwards through the supporting inclined plane, so that the lower supporting plate is driven to press downwards through the compression spring, the lower supporting plate drives the upper supporting plate to press downwards through the connecting plate, and the compensation inserting sheet is pressed into the wedging groove, so that the problem that the compensation inserting sheet is adhered to one inner inserting sheet and cannot fall down due to the effect of soil pressure outside the foundation pit for a long time is solved; meanwhile, the compensation insertion pieces are pressed into the wedging groove by downward pressing of the upper supporting plate, so that gaps among the insertion pieces can be eliminated, and the outer wedge surfaces of the compensation insertion pieces are abutted against the inner wedge surfaces of the wedging groove; therefore, a new inserting plate is inserted between the inserting plates without manual operation, the gap between the inserting plates can be effectively eliminated, the outer wedge surfaces of the compensating inserting plates are abutted against the inner wedge surfaces of the wedging grooves, and the inserting plate type locking and supporting device can form reliable and stable support in a post-pouring belt so as to transmit water and soil pressure. Therefore, the problem that the deformation in the foundation pit is too large and great hidden danger is caused to the safety of the foundation pit and the safety of the outer pipeline of the foundation pit can be solved under the action of the external soil pressure of the foundation pit by the foundation pit surrounding outer fender pile or the foundation pit surrounding fender wall.
and then, the hydraulic jack releases the pressure and takes out the pressure, because the inclination angle α of the outer wedge surface of the compensation inserting piece is smaller than the corresponding equivalent friction angle between the outer wedge surface of the compensation inserting piece and the inner wedge surface of the wedging groove, after the compensation inserting piece is pressed into the wedging groove and the outer wedge surface of the compensation inserting piece is abutted against the inner wedge surface of the wedging groove, the self-locking function is realized between the compensation inserting piece and the inner inserting piece, after the pressure is released by the hydraulic jack, each inserting piece can reliably support and transmit the external soil pressure of the foundation pit, and the compensation inserting piece is prevented from sliding upwards along the inner wedge surface due to the external soil pressure of the foundation pit.
Further, as shown in fig. 6, the same deformation active control device includes two insert type locking support devices, and the hydraulic jack is located between the two insert type locking support devices.
Further, as shown in fig. 1, a plurality of active deformation control devices are arranged in the same post-cast strip 3.
Further, as shown in fig. 1, the post-cast strips 3 are distributed in a crisscross manner, and each post-cast strip is provided with a plurality of the active deformation control devices.
Further, as shown in fig. 2, the reinforcing bars 5 in the horizontal beam plates 2 on both sides of the post-cast strip 3 extend into the post-cast strip, and the reinforcing bars extending into the post-cast strip on the horizontal beam plates on both sides of the post-cast strip are not connected to each other. Before the concrete is cast in the post-cast strip, the steel bars extending into the post-cast strip on the horizontal beam plates positioned on the two sides of the post-cast strip are connected by welding.
Further, as shown in fig. 1 and 6, one side wall of the post-cast strip is provided with support piers 4 corresponding to the deformation active control devices one by one, and the deformation active control devices are located between the corresponding support piers and the other side wall of the post-cast strip.
Further, as shown in fig. 6 and 7, the active deformation control device further comprises two anchor plates 6.2, wherein one anchor plate is fixed on the supporting pier, and the other anchor plate is fixed on the other side wall of the post-cast strip. The end part of the outer sliding sleeve is fixed on one of the anchor plates, and the end part of the inner sliding sleeve is fixed on the other anchor plate. Thus, the actual installation operation of the deformation active control device is facilitated.
Further, as shown in fig. 6 and 7, the insert placing groove is internally provided with supporting section steel 6.34, one end of the supporting section steel is supported on the anchor plate at the end part of the outer sliding sleeve, and the other end of the supporting section steel extends into the cavity of the inner sliding sleeve. The inserted sheet is located between the anchor plate of support shaped steel and inner sliding sleeve. Thus, the number of the insert pieces can be reduced.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, alterations and equivalents of the above embodiments according to the technical spirit of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (10)
1. A deformation control device for a reverse foundation pit horizontal beam plate supporting structure comprises foundation pit peripheral guard piles or foundation pit peripheral guard walls arranged along the edge of a foundation pit and horizontal beam plates arranged in the foundation pit, wherein the horizontal beam plates are used for supporting the foundation pit peripheral guard piles or the foundation pit peripheral guard walls so as to bear soil and water pressure transmitted by the foundation pit peripheral guard piles or the foundation pit peripheral guard walls; when the deformation of the foundation pit peripheral pile or the foundation pit peripheral retaining wall to the inside of the foundation pit exceeds a set value, the foundation pit peripheral pile or the foundation pit peripheral retaining wall is jacked back outwards through the hydraulic jack and inserted into the inserting piece type locking and supporting device through inserting pieces so as to eliminate gaps among the inserting pieces on the inserting piece type locking and supporting device, and therefore the inserting piece type locking and supporting device is supported in a post-cast strip and used for transmitting water and soil pressure.
2. The deformation control device for the horizontal beam plate supporting structure of the reverse construction foundation pit according to claim 1, is characterized in that the inserting piece type locking and supporting device comprises a telescopic sliding sleeve, the telescopic direction of the telescopic sliding sleeve is parallel to the telescopic direction of the hydraulic jack, the telescopic sliding sleeve comprises an inner sliding sleeve and an outer sliding sleeve sleeved outside the inner sliding sleeve, the end part of the outer sliding sleeve is fixed on one side surface of the post-pouring belt, the end part of the inner sliding sleeve is fixed on the other side surface of the post-pouring belt, the inner sliding sleeve and the cavity of the outer sliding sleeve form an inserting piece placing groove, the opening of the inserting piece placing groove faces upwards, the inserting piece is inserted into the inserting piece placing groove, and each inserting piece is sequentially distributed along the telescopic direction of the telescopic.
3. The deformation control device for the horizontal beam-slab supporting structure of the reverse foundation pit according to claim 2, wherein the deformation active control device further comprises an upper pressure plate, a lower supporting plate positioned below the upper pressure plate, a lower supporting plate connecting plate connected with the upper pressure plate, a floating plate positioned above the lower supporting plate, a vertical guide hole arranged on the lower supporting plate, a vertical guide rod slidably arranged in the vertical guide hole, a compression spring sleeved on the vertical guide rod, a vertical supporting rod fixed on the ejector rod of the hydraulic jack and a roller arranged at the lower end of the vertical supporting rod, wherein the upper end of the vertical guide rod is connected with the floating plate, the lower end of the vertical guide rod is provided with a lower limit block, the compression spring is positioned between the lower supporting plate and the floating plate, the floating plate is positioned below the roller, the upper surface of the floating plate is a supporting inclined surface, and the roller is supported on the supporting inclined,
the inserting pieces comprise a plurality of inner inserting pieces and a plurality of compensating inserting pieces which are supported on the bottom surfaces of the inserting piece placing grooves, a wedge groove is formed in a gap between any two adjacent inner inserting pieces, inner inclined wedge surfaces are arranged on two opposite side surfaces of the wedge groove, the distance between the two inner inclined wedge surfaces of the wedge groove is gradually increased from bottom to top, the compensating inserting pieces are inserted into the wedge groove in a one-to-one correspondence mode, the side surfaces of the compensating inserting pieces are outer inclined wedge surfaces matched with the inner inclined wedge surfaces, and the upper ends of the compensating inserting pieces are located above the wedge groove; the upper pressure plate is positioned above the compensation insertion sheets, and the upper pressure plate is supported on the upper ends of the compensation insertion sheets.
4. the deformation control device for the horizontal beam plate supporting structure of the reverse foundation pit according to claim 3, wherein the inclination angle α of the outer wedge surface of the compensation insertion sheet is smaller than the corresponding equivalent friction angle between the outer wedge surface of the compensation insertion sheet and the inner wedge surface of the wedging groove.
5. The deformation control device for the horizontal beam plate supporting structure of the reverse foundation pit according to claim 1, 2, 3 or 4, wherein a plurality of deformation active control devices are arranged in the same post-cast strip.
6. The deformation control device for the horizontal beam plate supporting structure of the reverse foundation pit according to claim 1, 2, 3 or 4, wherein the post-cast strips are distributed in a crisscross manner, and each post-cast strip is provided with a plurality of deformation active control devices.
7. The deformation control device for the horizontal beam plate supporting structure of the reverse foundation pit according to claim 1, 2, 3 or 4, wherein the reinforcing steel bars in the horizontal beam plates at the two sides of the post-cast strip extend into the post-cast strip, and the reinforcing steel bars in the horizontal beam plates at the two sides of the post-cast strip, which extend into the post-cast strip, are disconnected from each other.
8. The deformation control device for the horizontal beam plate support structure of the reverse construction foundation pit according to the claim 1, 2, 3 or 4, wherein one side wall of the post-cast strip is provided with support piers corresponding to the deformation active control device one by one, and the deformation active control device is positioned between the corresponding support piers and the other side wall of the post-cast strip.
9. The deformation control device for the horizontal beam plate support structure of the reverse foundation pit according to claim 1, 2, 3 or 4, wherein the same deformation active control device comprises two inserting piece type locking support devices, and the hydraulic jack is positioned between the two inserting piece type locking support devices.
10. A deformation control method for a horizontal beam plate supporting structure of a reverse foundation pit is characterized by sequentially comprising the following steps:
firstly, constructing foundation pit peripheral retaining piles or foundation pit peripheral retaining walls on the periphery of a basement;
secondly, excavating a soil body in the basement range, and synchronously monitoring the deformation of a foundation pit peripheral retaining pile or a foundation pit peripheral retaining wall to the inside of the foundation pit; when the designed underground layer elevation is excavated, a horizontal beam plate of the underground layer is poured, the horizontal beam plate is used for supporting a foundation pit peripheral pile or a foundation pit peripheral retaining wall so as to bear water and soil pressure transmitted by the foundation pit peripheral pile or the foundation pit peripheral retaining wall, and a post-pouring belt is arranged on the horizontal beam plate while the horizontal beam plate is poured so as to divide the horizontal beam plate into a plurality of areas;
thirdly, arranging a deformation active control device in the post-cast strip, wherein the deformation active control device comprises a hydraulic jack and an inserting piece type locking and supporting device which is arranged in the post-cast strip and used for transmitting water and soil pressure, and the inserting piece type locking and supporting device comprises a plurality of inserting pieces; in the process of excavating the soil body in the basement range, when the deformation of the foundation pit peripheral pile or the foundation pit peripheral retaining wall into the foundation pit exceeds a set value, the foundation pit peripheral pile or the foundation pit peripheral retaining wall is jacked back outwards through a hydraulic jack and inserted into the insert type locking and supporting device through inserts so as to eliminate gaps among inserts on the insert type locking and supporting device, so that the insert type locking and supporting device is supported in a post-cast strip and used for transmitting water and soil pressure;
fourthly, continuing to excavate the soil body downwards, and implementing the second step and the third step.
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| CN201910990048.4A CN111173036B (en) | 2019-10-17 | 2019-10-17 | Deformation control method and device for horizontal beam plate supporting structure of reverse foundation pit |
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| CN201910990048.4A CN111173036B (en) | 2019-10-17 | 2019-10-17 | Deformation control method and device for horizontal beam plate supporting structure of reverse foundation pit |
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