CN112376572A - Vertical supporting structure capable of adapting to tensioning deformation of prestressed beam of top plate of reverse foundation pit - Google Patents
Vertical supporting structure capable of adapting to tensioning deformation of prestressed beam of top plate of reverse foundation pit Download PDFInfo
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- CN112376572A CN112376572A CN202011124996.9A CN202011124996A CN112376572A CN 112376572 A CN112376572 A CN 112376572A CN 202011124996 A CN202011124996 A CN 202011124996A CN 112376572 A CN112376572 A CN 112376572A
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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
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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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Abstract
The invention discloses a vertical supporting structure capable of adapting to tension deformation of a prestressed beam of a top plate of a reverse foundation pit, and aims to provide a vertical supporting structure which can greatly shorten the construction time, improve the construction effect and meet the safety requirement in the construction process. The two end part upright columns are positioned below two ends of the prestressed beam of the basement and are used for supporting two ends of the prestressed beam of the basement; the adjustable lattice steel stand column is positioned below the middle part of the prestressed beam of the basement and used for supporting the middle part of the prestressed beam of the basement, and comprises an upper section of lattice stand column, a lower section of lattice stand column and a plurality of connecting bolts for connecting the lower end of the upper section of lattice stand column and the upper end of the lower section of lattice stand column.
Description
Technical Field
The invention relates to the field of foundation pit reverse construction, in particular to a vertical supporting structure suitable for tension deformation of a prestressed beam of a top plate of a reverse foundation pit.
Background
The reverse construction method is an ultra-conventional construction method and is generally adopted under special conditions of deep foundation, complex geology, high underground water level and the like. In the construction process of the reverse construction method, a vertical supporting system needs to be arranged, and the vertical supporting system and the envelope structure bear vertical load before the top plate of the basement is not finished. When the bearing capacity of the support system cannot meet the requirements of the construction stage, the number of the temporary upright columns can be increased on the periphery of the columns, so that the bearing capacity meets the design requirements. The temporary upright columns are generally lattice steel upright columns, the lower ends of the lattice steel upright columns are fixed on the basement foundation, and the upper ends of the lattice steel upright columns are fixed in the middle of a top plate prestressed beam of the basement.
When the beam of the roof slab of the basement is a roof prestressed beam and the tensioning method is a post-tensioning method, the existence of the lattice steel upright posts can influence the tensioning effect, and the lattice steel upright posts can not be directly removed in the tensioning process because the lattice steel upright posts need to bear vertical load and provide safety guarantee for the tensioning process. For such cases, the currently commonly employed methods are: the lattice steel columns are cut before tensioning, temporary supports are arranged, all the lattice steel columns are used as targets in the method, and the construction process is complicated and low in efficiency.
In addition, the top plate prestressed beam is designed according to the load in the use stage, and the load requirement can be met after the top plate prestressed beam applies prestress by a post-tensioning method in general conditions; however, in the construction process of some large foundation pits, a muck truck and the like need to travel, and the load of the muck truck in the traveling process is large, so that the prestressed roof beam cannot meet the high load requirement in the construction stage under the condition, and particularly, the prestressed roof beam with a large span cannot meet the high load requirement in the construction stage under the condition; therefore, even after the tensioning is finished, the upright post support is still arranged below the beam.
Disclosure of Invention
The invention aims to provide a vertical supporting structure which can adapt to the tension deformation of a prestressed beam of a top plate of a reverse foundation pit, can greatly shorten the construction time, improve the construction effect and meet the safety requirement in the construction process.
The second purpose of the invention is to provide a vertical supporting structure which can adapt to the tension deformation of the top plate prestressed beam of the reverse foundation pit and can meet the high load requirement of the top plate prestressed beam in the construction stage.
The technical scheme of the invention is as follows:
the utility model provides a vertical support structure that adaptable contrary foundation ditch roof prestressed beam stretch-draw warp that does, includes: the two end upright columns are positioned below the two ends of the top plate prestressed beam and are used for supporting the two ends of the top plate prestressed beam; the adjustable lattice steel upright post is positioned below the middle part of the top plate prestressed beam and used for supporting the middle part of the top plate prestressed beam, and comprises an upper section of lattice upright post, a lower section of lattice upright post and a plurality of connecting bolts for connecting the lower end of the upper section of lattice upright post and the upper end of the lower section of lattice upright post. Thus, the connecting bolt is loosened before the prestressed tendon of the prestressed roof beam is tensioned (namely, the prestressed tendon pre-embedded in the prestressed roof beam is tensioned and the prestressed roof beam is prestressed), so that the adjustable lattice steel upright column cannot influence the prestressed tensioning effect of the prestressed roof beam in the prestressed tendon tensioning process (the middle part of the prestressed roof beam can be slightly arched upwards in the prestressed tendon tensioning process); secondly, prestress ribs pre-buried in the top plate prestress beam are stretched, and prestress can be applied to the top plate prestress beam; need cut lattice steel stand before with present stretch-draw, the comparatively loaded down with trivial details inefficiency of work progress is compared, and the roof prestressed beam vertical support structure of this scheme only needs to loosen connecting bolt, need not to cut lattice steel stand, and its construction convenience can greatly shorten the engineering time, improves the construction effect to can satisfy the security requirement in the work progress.
Preferably, the lower end of the upper section of lattice column is provided with an upper connecting steel plate, the upper end of the lower section of lattice column is provided with a lower connecting steel plate, the upper connecting steel plate and the lower connecting steel plate are horizontally distributed, and the connecting bolt is connected with the upper connecting steel plate and the lower connecting steel plate. Therefore, the installation of the connecting bolt is convenient, and the lower end of the upper section lattice upright post is connected with the upper end of the lower section lattice upright post through the connecting bolt.
Preferably, a reinforcing rib is provided between the upper connecting steel plate and the outer side surface of the upper lattice column, and a reinforcing rib is also provided between the lower connecting steel plate and the outer side surface of the lower lattice column.
As preferred, lattice steel stand still includes adjustable stand connection structure, and adjustable stand connection structure is located between upper segment lattice stand and the hypomere lattice stand, adjustable stand connection structure include upper portion wedge and with upper portion wedge complex lower part wedge, the lower surface of upper portion wedge is last tight inclined plane of wedging, and the upper surface of lower part wedge is tight inclined plane of wedging down, goes up the tight inclined plane of wedging and closely laminates with lower tight inclined plane of wedging, the upper end at hypomere lattice stand is fixed to the lower part wedge, and the upper portion wedge can be followed down the tight inclined plane of wedging and slided.
Therefore, after prestress ribs which are pre-embedded in the top plate prestress beam are tensioned and prestress is applied to the top plate prestress beam, the upper wedge block can slide upwards along the lower wedge inclined plane to eliminate gaps generated between the upper section lattice stand column and the lower section lattice stand column in the prestress rib tensioning process, and then the adjustable lattice stand column can recover bearing capacity by locking the connecting bolt, so that the top plate prestress beam can meet the safety requirement of high-load conditions in the construction stage, such as the high-load conditions of slag car walking.
Preferably, the adjustable upright post connecting structure further comprises a stepped one-way clamping mechanism, the stepped one-way clamping mechanism comprises a plurality of strip-shaped clamping grooves arranged on the lower wedging inclined plane, a latch accommodating groove arranged on the upper wedging inclined plane, a plurality of vertical guide grooves arranged on the upper wedge block and one-to-one corresponding one-way latch assemblies arranged in the vertical guide grooves, the strip-shaped clamping grooves are sequentially distributed at equal intervals along the lower wedging inclined plane from bottom to top, and the strip-shaped clamping grooves are in a V shape; the vertical guide groove is in one-to-one correspondence with the strip-shaped clamping grooves, the lower ends of the vertical guide grooves are communicated with the inner top surfaces of the clamping tooth containing grooves, the cross sections of the vertical guide grooves are long in strip shape, the length directions of the cross sections of the vertical guide grooves are parallel to the length directions of the strip-shaped clamping grooves, the one-way clamping tooth assembly comprises at least two vertical floating clamping plates which are sequentially distributed along the length directions of the strip-shaped clamping grooves, the vertical floating clamping plates can slide up and down along the vertical guide grooves, the lower ends of the vertical floating clamping plates are provided with clamping teeth matched with the strip-shaped clamping grooves, the clamping tooth containing grooves are used for containing the clamping teeth, the clamping teeth are clamped into the corresponding strip-shaped clamping grooves or abut against the lower wedge-shaped inclined planes under the gravity action of the vertical floating clamping plates, and are matched with the strip-shaped clamping grooves after the clamping teeth are clamped into the, the upper wedge block is used for preventing the upper wedge block from sliding downwards along the lower wedging inclined plane, but is allowed to continuously slide upwards along the lower wedging inclined plane; in the same one-way latch assembly, the latches on each vertical floating clamping plate are distributed in sequence at equal intervals in the arrangement direction of each strip-shaped clamping groove. So, can "do not influence upper portion wedge and up slide along lower wedging inclined plane to eliminate prestressing tendons stretch-draw in-process, under the condition of the gap that produces between upper segment lattice stand and the hypomere lattice stand," through latch and the cooperation of bar screens groove, prevent that upper portion wedge from down sliding along lower wedging inclined plane, thereby effectual improvement upper portion wedge and the stability of lower part wedge, with the stability of the bearing capacity of guaranteeing adjustable lattice steel stand.
On the other hand, since the latch is engaged with the strip-shaped retaining groove to prevent the upper wedge from sliding downward along the lower wedging inclined plane, the stepped adjustment is performed in such a manner that the upper wedge moves upward one step along the lower wedging inclined plane, and the latch falls down to engage with the strip-shaped retaining groove, wherein the step of moving upward one step along the lower wedging inclined plane of the upper wedge means that "the upper wedge slides upward a set distance D along the lower wedging inclined plane, and the latch falls down to engage with the strip-shaped retaining groove, the set distance D being generally the distance between two adjacent strip-shaped retaining grooves", and in order to make the set distance D for each step of moving of the upper wedge smaller, the latch can fall down to engage with the strip-shaped retaining groove, generally a manner of reducing the distance between two adjacent strip-shaped retaining grooves is adopted, but the reduction of the distance between two adjacent strip-shaped retaining grooves inevitably requires the reduction of the groove depth and the groove width of the strip-shaped retaining groove, the bearing capacity of the strip-shaped clamping groove is greatly reduced, and when the bearing capacity of the lattice steel upright is large, the strip-shaped clamping groove and the clamping teeth deform to cause the failure of the stepped one-way clamping mechanism; in order to solve the problem, this scheme, in same one-way latch subassembly, make the latch on each vertical cardboard that floats distribute at the array orientation in proper order equidistance in each bar screens groove, thus, can be under the condition of the interval that does not change two adjacent bar screens grooves (so that sufficient groove depth and groove width can be set to in the bar screens groove, make bar screens groove and have sufficient intensity and bearing capacity with bar screens groove complex latch), just can realize very big settlement distance D that reduces upper portion wedge each level and remove, the latch just can fall and bar screens groove cooperation, thereby make adjustable lattice steel stand can be better resume bearing capacity
Preferably, in the same one-way latch assembly, the length of the tooth tops of the latches on each vertical floating clamping plate arranged in the arrangement direction of each strip-shaped clamping groove is less than or equal to the distance between two adjacent strip-shaped clamping grooves. So, more be favorable to realizing very big settlement distance D that reduces upper portion wedge each grade and remove, the latch just can fall and bar screens groove cooperation to the recovery bearing capacity that lattice steel stand can be better with adjustable messenger.
Preferably, the inner side surface of the lower edge facing the lower wedging inclined surface in the two inner side surfaces of the strip-shaped clamping groove is a vertical surface, and the inner side surface of the upper edge facing the lower wedging inclined surface is a guide inclined surface.
Preferably, the same one-way latch assembly comprises four vertically floating snap-gauge plates.
As another preference, the inclination angle of the lower wedging inclined plane is smaller than the equivalent friction angle between the upper wedge block and the lower wedging inclined plane. So, at upper portion wedge up sliding along the lower wedging inclined plane to eliminate prestressing tendons stretch-draw in-process, after the gap that produces between upper segment lattice stand and the hypomere lattice stand, can avoid upper portion wedge to slide down along the lower wedging inclined plane, make the bearing capacity that adjustable lattice steel stand resumes.
Preferably, the lower wedge block is fixed at the upper end of the lower latticed column, and the upper wedge block can slide up and down along the lower wedging inclined plane.
Preferably, prestressed tendons are pre-embedded in the prestressed beam of the top plate.
The invention has the beneficial effects that:
firstly, the construction time can be greatly shortened, the construction effect is improved, and the safety requirement in the construction process can be met.
And secondly, the high load requirement of the prestressed beam of the top plate in the construction stage can be met.
Drawings
Fig. 1 is a schematic structural diagram of a vertical support structure adaptable to tension deformation of a prestressed beam of a top plate of a reverse foundation pit according to a first embodiment of the present invention.
Fig. 2 is a partial structural schematic view of an adjustable lattice steel column according to a first embodiment of the present invention.
Fig. 3 is a partial schematic structural view of an adjustable pillar connecting structure according to a second embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a vertical supporting structure adapted to tension deformation of a prestressed beam of a top plate of a reverse foundation pit according to a second embodiment of the present invention.
Fig. 5 is a top view of an upper wedge block and a lower wedge block of an adjustable column connection structure according to a third embodiment of the present invention.
Fig. 6 is a schematic cross-sectional view taken along line a-a in fig. 5.
Fig. 7 is a partial enlarged view of fig. 6 at D.
Fig. 8 is a schematic cross-sectional view taken along line B-B in fig. 5.
Fig. 9 is a schematic cross-sectional view at C-C in fig. 5.
In the figure:
adjustable lattice steel upright posts 1;
the upper section of the latticed column 1.1 is provided with a steel plate 1.1.1 and a reinforcing rib plate 1.1.2;
the lower section of the lattice column is 1.2, and the lower section of the lattice column is 1.2.1 of a lower connecting steel plate;
the adjustable upright post comprises an adjustable upright post connecting structure 1.3, an upper wedge block 1.3.1, a lower wedge block 1.3.2, an upper wedging inclined plane 1.3.4, a lower wedging inclined plane 1.3.5, a vertical guide groove 1.3.6, a one-way latch assembly 1.3.7, a vertical floating latch plate 1.3.71, a latch 1.3.72, a strip-shaped latch groove 1.3.8 and a latch accommodating groove 1.3.9;
a connecting bolt 1.4;
an end upright 2;
a top plate prestressed beam 3 and prestressed tendons 3.1.
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," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication 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 and 2, the vertical supporting structure suitable for tension deformation of the prestressed beam of the top plate of the reverse foundation pit comprises two end upright columns 2 and an adjustable lattice steel upright column 1. The two end part upright posts 2 are positioned below two ends of the top plate prestressed beam 3 and are used for supporting two ends of the top plate prestressed beam. In this embodiment, the roof prestressed beam refers to a beam of a floor slab of a basement. Prestressed tendons 3.1 are pre-embedded in the prestressed beam of the top plate. The adjustable lattice steel upright post 1 is positioned below the middle part of the top plate prestressed beam and is used for supporting the middle part of the top plate prestressed beam. The adjustable lattice steel upright column comprises an upper section lattice upright column 1.1, a lower section lattice upright column 1.2 and a plurality of connecting bolts 1.4 for connecting the lower end of the upper section lattice upright column and the upper end of the lower section lattice upright column. The upper segment lattice stand is lattice steel stand or shaped steel stand, and in this embodiment, the upper segment lattice stand is lattice steel stand. The lower section of the lattice column is a lattice steel column or a section steel column.
Thus, the connecting bolt is loosened before the prestressed tendon of the prestressed roof beam is tensioned (namely, the prestressed tendon pre-embedded in the prestressed roof beam is tensioned and the prestressed roof beam is prestressed), so that the adjustable lattice steel upright column cannot influence the prestressed tensioning effect of the prestressed roof beam in the prestressed tendon tensioning process (the middle part of the prestressed roof beam can be slightly arched upwards in the prestressed tendon tensioning process); secondly, prestress ribs pre-buried in the top plate prestress beam are stretched, and prestress can be applied to the top plate prestress beam; need cut lattice steel stand before with present stretch-draw, the comparatively loaded down with trivial details inefficiency of work progress is compared, and the roof prestressed beam vertical support structure of this scheme only needs to loosen connecting bolt, need not to cut lattice steel stand, and its construction convenience can greatly shorten the engineering time, improves the construction effect to can satisfy the security requirement in the work progress.
In addition, after the prestress is applied to the prestressed roof beam, the adjustable lattice steel upright columns can be disassembled, and the method is suitable for the construction condition of load requirement after the prestress is applied to the prestressed roof beam, namely the prestressed roof beam does not need to bear the high load condition in the construction stage, such as the high load condition of walking of a muck truck.
The lower extreme of upper segment lattice stand is equipped with connection steel sheet 1.1.1, and the upper end of lower segment lattice stand is equipped with connection steel sheet 1.2.1 down, goes up connection steel sheet and lower connection steel sheet horizontal distribution. The connecting bolt 1.4 is connected with the upper connecting steel plate and the lower connecting steel plate. The connecting bolt extends up and down. Therefore, the installation of the connecting bolt is convenient, and the lower end of the upper section lattice upright post is connected with the upper end of the lower section lattice upright post through the connecting bolt.
A reinforcing rib plate 1.1.2 is arranged between the upper connecting steel plate and the outer side surface of the upper section of lattice column, and a reinforcing rib plate is also arranged between the lower connecting steel plate and the outer side surface of the lower section of lattice column.
The second embodiment is as follows: the remaining structure of this embodiment refers to the first embodiment, and the difference is that:
as shown in fig. 3 and 4, the adjustable lattice steel column 1 further includes an adjustable column connecting structure 1.3, and the adjustable column connecting structure is located between the upper lattice column and the lower lattice column. The adjustable upright post connecting structure comprises an upper wedge block 1.3.1 and a lower wedge block 1.3.2 matched with the upper wedge block. The lower surface of the upper wedge-shaped block is an upper wedging inclined plane 1.3.4, the upper surface of the lower wedge-shaped block is a lower wedging inclined plane 1.3.5, and the upper wedging inclined plane is tightly attached to the lower wedging inclined plane.
The lower wedge block is fixed at the upper end of the lower section lattice stand column, the upper wedge block can slide along the lower wedging inclined plane, specifically, the upper wedge block and the lower wedge block are positioned between the upper connecting steel plate and the lower connecting steel plate, and the lower wedge block is fixed on the lower connecting steel plate at the upper end of the lower section lattice stand column through welding; the upper wedge block can slide up and down along the lower wedge inclined plane.
The technical scheme of this embodiment is applicable to, the roof prestressed beam need adapt to the security requirement of high load condition at the construction stage, for example high load condition such as dregs car walking, specifically as follows:
after prestress bars pre-buried in the top plate prestress beams are tensioned and prestress is applied to the top plate prestress beams, the upper wedge blocks can slide upwards along the lower wedge inclined planes to eliminate gaps generated between the upper section lattice stand columns and the lower section lattice stand columns in the prestress bar tensioning process, and then the adjustable lattice stand columns can recover bearing capacity by locking the connecting bolts, so that the top plate prestress beams can meet the safety requirement of high-load conditions in the construction stage, such as high-load conditions of slag car walking. Need cut lattice steel stand before with present stretch-draw, the work progress is comparatively loaded down with trivial details inefficiency and compares, and lattice steel stand with adjustable this scheme is convenient construction not only, can greatly shorten the engineering time, improves the construction effect, but also can satisfy the high load needs of roof prestressed beam in the construction stage.
The inclination angle of the lower wedging inclined plane is smaller than the equivalent friction angle between the upper wedge block and the lower wedging inclined plane. So, at upper portion wedge up sliding along the lower wedging inclined plane to eliminate prestressing tendons stretch-draw in-process, after the gap that produces between upper segment lattice stand and the hypomere lattice stand, can avoid upper portion wedge to slide down along the lower wedging inclined plane, make the bearing capacity that adjustable lattice steel stand resumes.
In a third embodiment, the remaining structure of the present embodiment refers to the second embodiment, and the difference therebetween is that:
as shown in fig. 5, 6, 7, 8 and 9, the adjustable pillar connecting structure further includes a stepped one-way latch mechanism. The stepped one-way clamping mechanism comprises a plurality of strip-shaped clamping grooves 1.3.8 arranged on the lower wedging inclined plane, a plurality of latch accommodating grooves 1.3.9 arranged on the upper wedging inclined plane, a plurality of vertical guide grooves 1.3.6 arranged on the upper wedge block and one-to-one-way latch assemblies 1.3.7 arranged in the vertical guide grooves. In this embodiment, the lower wedging inclined plane is square, the upper edge and the lower edge of the lower wedging inclined plane are parallel, and the upper edge and the lower edge of the lower wedging inclined plane are horizontally distributed.
The strip-shaped clamping grooves 1.3.8 are distributed along the lower wedging inclined plane from bottom to top at equal intervals in sequence. The bar screens groove is the V font, and in this embodiment, the length direction in each bar screens groove parallels with the top edge on lower wedging inclined plane. The medial surface towards the lower limb of wedging inclined plane is vertical face in the two medial surfaces of bar screens groove, and the medial surface towards the upper edge on wedging inclined plane is the direction inclined plane down.
The vertical guide grooves 1.3.6 correspond to the strip-shaped clamping grooves one by one. The lower extreme of vertical guide way is linked together with the interior top surface of latch holding tank, and in this embodiment, the upper end of vertical guide way is linked together with the upper surface of upper portion wedge. The cross section of the vertical guide groove is in a long strip shape, and the length direction of the cross section of the vertical guide groove is parallel to the length direction of the strip-shaped clamping groove.
The unidirectional latch assembly 1.3.7 comprises at least two vertical floating snap-gauge 1.3.71 distributed in sequence along the length direction of the strip-shaped snap-gauge groove, and in the embodiment, the same unidirectional latch assembly comprises four vertical floating snap-gauge plates. Vertical cardboard that floats can be followed vertical guide way and slided from top to bottom, and the lower extreme of vertical cardboard that floats is equipped with the latch 1.3.72 with bar screens groove matched with. The latch accommodating groove is used for accommodating the latch. The latch is clamped into the corresponding strip-shaped clamping groove or is propped against the lower wedging inclined plane under the action of the gravity of the vertical floating clamping plate. The upper end of the vertical floating clamping plate is positioned in the vertical guide groove.
When the tooth supports under the action of gravity of the vertical floating clamping plate on the lower wedging inclined plane, the latch is accommodated in the latch accommodating groove so as to avoid influencing the upward sliding of the upper wedge-shaped block along the lower wedging inclined plane.
After the latch is blocked into the corresponding bar-shaped clamping groove under the action of gravity of the vertical floating clamping plate, the latch is matched with the bar-shaped clamping groove to prevent the upper wedge-shaped block from sliding downwards along the lower wedging inclined plane, but allow the upper wedge-shaped block to continuously slide upwards along the lower wedging inclined plane.
As shown in fig. 5, 7, 8 and 9, in the same one-way latch assembly, the latches on the four vertical floating snap-gauge plates are sequentially and equidistantly distributed in the arrangement direction of the strip-shaped latching grooves.
As shown in fig. 5, 7, 8 and 9, in the same one-way latch assembly, the length of the tooth tops of the latches on each vertical floating snap-gauge arranged in the arrangement direction of each strip-shaped detent groove is less than or equal to the distance between two adjacent strip-shaped detent grooves; in this embodiment, the distance between two adjacent bar-shaped retaining grooves is 10 mm, and in the same one-way latch assembly, the distance between the tooth tops of two connected latches in the arrangement direction of each bar-shaped retaining groove is 2 mm.
Although, the inclination angle on lower wedging inclined plane is less than the equivalent friction angle between upper portion wedge and the lower wedging inclined plane, bear vertical load's in-process at upper portion wedge, can avoid upper portion wedge to down slide along lower wedging inclined plane, but in actual work progress, because lattice steel stand bears vertical load big, it is easy to flatten with lower wedging inclined plane to go up the wedging inclined plane, lead to the equivalent friction coefficient between last wedging inclined plane and the lower wedging inclined plane to change (diminish), lead to upper portion wedge and lower portion wedge's stability not good, the risk that upper portion wedge down slided along lower wedging inclined plane can appear. To improve this problem, the present embodiment provides a stepped one-way snap mechanism to solve this problem, and particularly,
this embodiment has set up cascaded one-way latch mechanism, it can be at "do not influence the upper portion wedge and up slide along lower wedging inclined plane, in order to eliminate prestressing tendons stretch-draw process, under the condition of the gap that produces between upper segment lattice stand and the hypomere lattice stand", through latch and the cooperation of bar screens groove, prevent that the upper portion wedge from down sliding along lower wedging inclined plane, thereby the stability of effectual improvement upper portion wedge and lower part wedge, in order to guarantee the stability of the bearing capacity of adjustable lattice steel stand.
More importantly, the latch is matched with the strip-shaped clamping grooves to prevent the upper wedge block from sliding downwards along the lower wedging inclined plane, the stepped adjustment is carried out, namely, the upper wedge block moves upwards by one step along the lower wedging inclined plane, and the latch falls down to be matched with the strip-shaped clamping grooves, wherein the step of moving upwards by one step along the lower wedging inclined plane of the upper wedge block means that the upper wedge block slides upwards by a set distance D along the lower wedging inclined plane, the latch falls down to be matched with the strip-shaped clamping grooves, the set distance D is generally the distance between two adjacent strip-shaped clamping grooves, in order to ensure that the set distance D for moving every step of the upper wedge block is smaller, the latch can fall down to be matched with the strip-shaped clamping grooves, the mode of reducing the distance between two adjacent strip-shaped clamping grooves is generally adopted, but the reduction of the distance between the two adjacent strip-shaped clamping grooves inevitably needs to reduce the groove depth and the groove width of the strip-shaped clamping grooves, the great reduction of bearing capacity that leads to bar screens groove, when the bearing capacity of lattice steel stand is great, bar screens groove and latch warp can appear, and lead to the problem that cascaded one-way clamping mechanism became invalid.
In order to solve the problem, in the embodiment, in the same one-way latch assembly, the latches on each vertical floating latch are sequentially distributed at equal intervals in the arrangement direction of each strip-shaped latch groove, so that the strip-shaped latch grooves can be set to have enough groove depth and width without changing the distance between two adjacent strip-shaped latch grooves (so that the strip-shaped latch grooves and the latches matched with the strip-shaped latch grooves have enough strength and bearing capacity), the set distance D for each stage of movement of the upper wedge block can be greatly reduced, the latches can fall down to be matched with the strip-shaped latch grooves, and the adjustable lattice steel stand column can better recover the bearing capacity; specifically, in this embodiment, the distance between two adjacent strip-shaped clamping grooves is 10 mm, so that the strip-shaped clamping grooves have enough positions to set the groove depth and the groove width of the strip-shaped clamping grooves; and because in same one-way latch subassembly, the tooth top of two continuous latches is 2 millimeters in the interval of the array orientation in each bar screens groove, so, although the interval between two adjacent bar screens grooves is 10 millimeters, but upper portion wedge block only need along the every distance that sets for distance D for 2 millimeters that upwards slides of wedge inclined plane down, the latch just can fall and bar screens groove cooperation, the recovery bearing capacity that makes adjustable lattice steel stand can be better.
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 (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011124996.9A CN112376572B (en) | 2020-10-20 | 2020-10-20 | A vertical support structure that can adapt to the tensile deformation of the prestressed beam on the roof of the inverse foundation pit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011124996.9A CN112376572B (en) | 2020-10-20 | 2020-10-20 | A vertical support structure that can adapt to the tensile deformation of the prestressed beam on the roof of the inverse foundation pit |
Publications (2)
| Publication Number | Publication Date |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1126232A (en) * | 1976-02-09 | 1982-06-22 | James L. Griswold | Trench shoring assembly |
| CN103967127A (en) * | 2014-05-23 | 2014-08-06 | 东北石油大学 | Special strong combination column and combination beam frame with internally-arranged core columns and construction method thereof |
| CN104099934A (en) * | 2014-04-01 | 2014-10-15 | 浙江省建筑设计研究院 | Supporting structure of large foundation pit |
| CN106968256A (en) * | 2017-03-22 | 2017-07-21 | 深圳市福田建安建设集团有限公司 | Foundation ditch assembled steel trestle construction method |
| CN111778997A (en) * | 2020-07-27 | 2020-10-16 | 江苏建筑职业技术学院 | A tension string structure to improve the bearing capacity of steel support under compression |
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2020
- 2020-10-20 CN CN202011124996.9A patent/CN112376572B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1126232A (en) * | 1976-02-09 | 1982-06-22 | James L. Griswold | Trench shoring assembly |
| CN104099934A (en) * | 2014-04-01 | 2014-10-15 | 浙江省建筑设计研究院 | Supporting structure of large foundation pit |
| CN103967127A (en) * | 2014-05-23 | 2014-08-06 | 东北石油大学 | Special strong combination column and combination beam frame with internally-arranged core columns and construction method thereof |
| CN106968256A (en) * | 2017-03-22 | 2017-07-21 | 深圳市福田建安建设集团有限公司 | Foundation ditch assembled steel trestle construction method |
| CN111778997A (en) * | 2020-07-27 | 2020-10-16 | 江苏建筑职业技术学院 | A tension string structure to improve the bearing capacity of steel support under compression |
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| CN112376572B (en) | 2022-03-29 |
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