CN117144936B - Foundation pit support structure and construction method thereof - Google Patents
Foundation pit support structure and construction method thereof Download PDFInfo
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- CN117144936B CN117144936B CN202311353758.9A CN202311353758A CN117144936B CN 117144936 B CN117144936 B CN 117144936B CN 202311353758 A CN202311353758 A CN 202311353758A CN 117144936 B CN117144936 B CN 117144936B
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- 238000010276 construction Methods 0.000 title claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 258
- 239000010959 steel Substances 0.000 claims abstract description 258
- 230000007246 mechanism Effects 0.000 claims abstract description 57
- 239000002689 soil Substances 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 19
- 230000008569 process Effects 0.000 claims description 15
- 230000008093 supporting effect Effects 0.000 claims description 15
- 238000004891 communication Methods 0.000 claims description 13
- 238000005520 cutting process Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 10
- 241000221035 Santalaceae Species 0.000 abstract description 5
- 235000008632 Santalum album Nutrition 0.000 abstract description 5
- 230000006872 improvement Effects 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000009412 basement excavation Methods 0.000 description 4
- 230000000670 limiting effect Effects 0.000 description 4
- 230000013011 mating Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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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
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/14—Sealing joints between adjacent sheet piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/16—Auxiliary devices rigidly or detachably arranged on sheet piles for facilitating assembly
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
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- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Paleontology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
The invention discloses a foundation pit support structure and a construction method thereof, which belong to the field of foundation pit construction structures, and comprise four sides Larson steel sheet piles, wherein the Larson steel sheet piles comprise convex steel sheet piles, concave steel sheet piles and hook arms, and further comprise: four groups of edge connecting mechanisms, wherein the edge connecting mechanisms comprise mounting seats and connecting devices, and the connecting devices connect and fix four sides of Larson steel sheet piles and provide anchor points for sandalwood strips welded on the Larson steel sheet piles; the connecting seam retaining mechanisms comprise a cage device, a guiding chute, and the cage device clamps adjacent convex steel sheet piles and concave steel sheet piles to limit in the transverse direction, the guiding chute is connected with the adjacent convex steel sheet piles and concave steel sheet piles to limit in the longitudinal direction, the enclosure surface formed by the Lassen steel sheet piles can be stabilized, and good constraint and fixing effects are formed at the bottom and the lateral direction of the enclosure surface, so that the enclosure surface formed by the Lassen steel sheet piles is stable and balanced.
Description
Technical Field
The invention relates to a foundation pit construction structure, in particular to a foundation pit support structure and a construction method thereof.
Background
The foundation pit belongs to temporary engineering, the foundation pit is used for providing a space, the masonry operation of the foundation can be carried out according to the position appointed by the design, the excavation scheme is determined before excavation according to geological hydrologic data and the condition of buildings nearby the site, various underground constructions such as a multi-layer basement, a subway, a underground commercial street and the like are constructed for developing and utilizing the underground space, a foundation pit enclosure mode is often adopted, a gravity type stirring pile retaining wall, a underground continuous wall and a pile type retaining wall are arranged on the common foundation pit enclosure, and the pile type retaining wall is convenient for mechanical rapid excavation; the soil-retaining and water-stopping double-function soil-retaining machine is economical in general, free of vibration, free of noise, less in pollution and slight in soil compaction in construction.
In pile-type retaining walls, most of pile-type retaining walls adopt a Larson steel sheet pile retaining mode, namely static Larson steel sheet piles are arranged into a line-shaped connection arrangement, a space arrangement, a staggered connection arrangement, a lap joint arrangement or a mixed arrangement, so that a firm retaining wall structure is formed, the effect of fixing soil bodies before and after the retaining wall structure can be achieved, and meanwhile, a certain waterproof effect can be achieved.
However, in the actual use process of the Larson steel sheet pile, particularly in some large-span and large-area underground spaces, as the distance between the enclosure surfaces surrounded by the Larson steel sheet pile is too long, when the soil body is displaced, the phenomena of deformation and stretch-breaking are easy to occur in the middle section of the enclosure surfaces, and the phenomenon of disjointing is easy to occur in the edge connection position of the enclosure structure, so that the whole enclosure structure is irreversibly damaged.
Therefore, the scheme aims to provide the foundation pit support structure and the construction method thereof, which can stabilize the support surface formed by the Larson steel sheet piles, and form better binding and fixing effects at the bottom and the lateral directions of the support surface, so that the support surface formed by the Larson steel sheet piles is stable and balanced.
Disclosure of Invention
The invention provides a foundation pit support structure and a construction method thereof, which can effectively solve the problems.
The invention is realized in the following way:
the utility model provides a foundation pit enclosure, includes four sides Larson steel sheet pile, larson steel sheet pile includes protruding type steel sheet pile and concave type steel sheet pile, and the both sides of protruding type steel sheet pile and concave type steel sheet pile are provided with the hook arm opposite in direction respectively, protruding type steel sheet pile and concave type steel sheet pile set up in turn and are in the same place through the hook arm hook joint, still include:
four groups of edge connecting mechanisms, wherein the edge connecting mechanisms comprise mounting seats pre-buried at four corners of the bottom of a foundation pit, connecting devices which are vertically fixed on the mounting seats and are used for fixing Larson steel sheet piles in two directions, mounting tables which are arranged at the tops of the connecting devices and are used for mounting sandal wood strips, and the connecting devices are used for connecting and fixing the Larson steel sheet piles on four sides and providing anchor points for the sandal wood strips welded on the Larson steel sheet piles;
the connecting seam retaining mechanisms comprise cage devices sleeved at the lower ends of the hook arms of the convex steel sheet piles and the hook arms of the concave steel sheet piles, and guide slide channels arranged on the inner sides of the convex steel sheet piles and the concave steel sheet piles, wherein the cage devices clamp adjacent convex steel sheet piles and concave steel sheet piles so as to limit the adjacent concave steel sheet piles in the transverse direction, and the guide slide channels are connected with the adjacent convex steel sheet piles and the adjacent concave steel sheet piles so as to limit the adjacent steel sheet piles in the longitudinal direction;
the convex side supporting mechanisms comprise inclined pull structures arranged on the convex steel sheet piles, the inclined pull structures are arranged in grooves on one side, far away from the inner wall surface of the foundation pit, of the convex steel sheet piles, and soil bodies in the foundation pit can be propped up by the inclined pull structures when being extruded inwards.
As a further improvement, the linking device comprises an outer column cylinder for connecting the mounting seat and the mounting table, a communication hole is formed in the direction of the outer column cylinder, which is close to the Lasen steel sheet pile, two clamping rods are fixedly arranged on the inner side of the outer column cylinder, and the hook arms of the convex steel sheet pile or the concave steel sheet pile penetrate through the communication hole and are buckled on the clamping rods.
As a further improvement, the hook arm penetrating through the convex steel sheet pile or the concave steel sheet pile of the communication hole comprises an inner matching part arranged in the outer column casing and an outer matching part arranged outside the outer column casing, an outer buckling seat is arranged between the inner matching part and the outer matching part, the connecting device further comprises a butt column fixedly connected to two ends of the inner side of the communication hole, and when the hook arm is matched with the clamping rod, the butt column is spliced into the outer buckling seat.
As a further improvement, the cage device comprises a guide plate pre-buried to the whole foundation pit, the guide plate is positioned between the two connecting devices, and a plurality of sleeve barrels are arranged on the guide plate and used for accommodating the two hook arms corresponding to the convex steel sheet piles and the concave steel sheet piles.
As a further improvement, the inner side of the sleeve barrel is integrally formed with a plurality of fins which are obliquely directed to the ground, the outer side of the hook arm is provided with a plurality of steel shots, and the hook arm is clamped behind the sleeve barrel and the fins are abutted against the steel shots.
As a further improvement, the guide chute comprises a flat chute fixed on the convex steel sheet pile or the concave steel sheet pile, and an arc chute which is positioned on one side of the convex side supporting mechanism close to the Lasen steel sheet pile and communicated with the flat chute, and the adjacent flat chute is fixedly attached.
As a further improvement, the inclined pulling structure comprises a group of L-shaped connecting cylinders which are locked on the inner side plane of the convex steel sheet pile and are diagonally arranged, connecting rods which are inserted into the two L-shaped connecting cylinders, L-shaped springs which are arranged in the L-shaped connecting cylinders, the parts of the connecting rods, which extend into the L-shaped connecting cylinders, are abutted to the L-shaped springs, and the connecting rods are composed of a positive and negative screw rod and two internal screws.
As a further improvement, a wedge knife fixedly connected to the inner side plane of the convex steel sheet pile is further arranged below the inclined pulling structure, the bottom of the wedge knife is a cutting edge, and two sides of the wedge knife are abutted to the inner side of the U-shaped opening of the convex steel sheet pile.
The invention also provides a construction method of the foundation pit support structure, comprising the following steps of:
s1, performing S1; fixing a piece of convex steel sheet piles or concave steel sheet piles on two sides of the edge connecting mechanisms, and driving four groups of edge connecting mechanisms into four corners of the whole foundation pit to form preliminary positioning;
s2, performing S2; embedding a cage device between two edge connecting mechanisms according to the positioning of the edge connecting mechanisms, and enclosing a construction area on the lowest plane of the foundation pit;
s3, performing S3; the method comprises the steps that a diagonal structure is arranged on the inner side of a convex steel sheet pile, the length of a connecting rod is adjusted according to the size of a foundation pit and the pressure of soil, then the convex steel sheet pile and a concave steel sheet pile are driven in sequence along the edge connecting mechanism in an alternating mode, the bottoms of hook arms of the convex steel sheet pile and the concave steel sheet pile are driven in an inserting mode to an embedded cage device, and the edge connecting mechanisms on four corners, the convex steel sheet pile and the concave steel sheet pile form a retaining wall;
s4, performing S4; and after the foundation pit digging process is finished, welding sandal strips or supporting frames between the edge connecting mechanisms and between the convex steel sheet piles and the concave steel sheet piles.
As a further improvement, the step S3 further includes: the convex steel sheet piles and the concave steel sheet piles are mutually attached between adjacent flat chute in the alternate driving process to form a complete guide channel.
The beneficial effects of the invention are as follows:
in the conventional Larson steel sheet pile arrangement, a mode of four sides Larson steel sheet piles and cement pouring is adopted, but the construction process is limited to a small basement, if a problem is easy to occur in the middle section position of a large underground building or a region with longer span length, a single thin Larson steel sheet pile is easy to deform at the arrangement connection position of the two sides Larson steel sheet piles, firstly, edge connection mechanisms are arranged on four corners of a foundation pit, firstly, the coverage area and the specific position of the whole building enclosure are positioned by utilizing the edge connection mechanisms, at least one convex steel sheet pile or one concave steel sheet pile is connected to two sides of the edge connection mechanisms, so that the rest convex steel sheet piles or concave steel sheet piles are only required to be driven in sequence, and the stability of the edge side of the whole building enclosure is ensured because the steel sheet piles at the edge side are fixed by the edge connection mechanisms;
the convex steel sheet piles and the concave steel sheet piles are hooked together through the hook arms, but in practice, the connection is relatively unstable only through the hook arms, and due to the uncertainty of soil movement, the hook arms are easy to deform and disintegrate when the transverse pulling and the longitudinal pulling occur simultaneously, so that the cage device is embedded at the lower ends of the connection positions of the two hook arms, the two hook arms can be covered and limited and fixed, a relatively good fixing effect is formed on the middle position of the Larson steel sheet piles, and the long-distance Larson steel sheet piles are prevented from being arranged at the middle position to collapse;
when the soil body is contacted with the convex steel sheet pile, the convex steel sheet pile is convexly arranged towards the soil body at one side to be supported, so that the influence on the convex steel sheet pile is larger, and once the soil body changes, the soil body changes at the first time, the inclined-pulling structure is arranged at the back side of the convex steel sheet pile, and the inner side surface of the convex steel sheet pile is supported and fixed at fixed points, so that the remarkable influence of the soil body change on the whole enclosure structure is avoided.
The stability of the convex steel sheet pile or the concave steel sheet pile connected with the whole edge connecting mechanism is the most important, and whether the whole Larson steel sheet pile is stable in arrangement or not is directly determined, so that a clamping rod is arranged in the outer column cylinder, a hook arm on the convex steel sheet pile or the concave steel sheet pile connected with the edge connecting mechanism can be clamped on the clamping rod, but in order to avoid the deformation of the hook arm due to the fact that the whole structure is subjected to abrupt transverse pulling, the outer column cylinder is further provided with an abutting column, and meanwhile, an outer buckling seat is arranged on the corresponding hook arm, so that a protection checkpoint is arranged at the front end position of the clamping rod matched with the hook arm, and the connecting effect between the steel sheet pile and the edge connecting mechanism is prevented from being influenced by the abrupt transverse pulling force.
Under the condition that soil collapses or normally deforms, a transverse or longitudinal pulling force is randomly generated on the enclosure structure, so that the whole enclosure structure needs to have longitudinal and transverse anti-dialectic forces, as the convex steel sheet piles and the concave steel sheet piles are buried in earthwork and are not removed after being fixed, the problem of disassembly is not needed to be considered.
The invention utilizes the guide chute arranged on the convex steel sheet pile or the concave steel sheet pile, when the steel sheet pile is independently arranged, the guide chute is only a groove-shaped structure, but when the steel sheet piles are combined to form a complete Lasen steel sheet pile arrangement, a plurality of guide chutes also form a long groove structure which runs through from front to back, water in a foundation pit can be led out from the middle part to the side seam position of the foundation pit for unified treatment, foundation pit water is intensively treated, meanwhile, due to the fact that the guide chute is also certain in rigidity, when the steel sheet pile and the steel sheet pile are spliced together, the guide chute can be mutually braked through the guide chute, so that a certain limiting effect on the steel sheet pile is achieved on the transverse position, and the stability of the enclosure mechanism is achieved.
Although the inclined pulling structure is arranged to improve the strength of the convex steel sheet pile to a certain extent, certain difficulty is also produced for piling the convex steel sheet pile, the structure of the inclined pulling structure can improve the detention degree of the inclined pulling structure in the earthwork in the piling process, and for this purpose, the inclined cutter is arranged at the bottom of the inclined pulling structure, and in the steel sheet pile driving process, the inclined cutter is firstly contacted with the soil body, so that the inclined pulling structure is immediately followed by the soil body after a certain gap is broken, and the damage of the inclined pulling structure due to the forced piling action in the using process is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic perspective view of a foundation pit enclosure according to the present invention.
Fig. 2 is a schematic top view of a foundation pit enclosure of the present invention.
Fig. 3 is a schematic perspective view of a convex steel sheet pile and a concave steel sheet pile according to a first embodiment of the present invention.
Fig. 4 is a schematic front view of a convex steel sheet pile and a concave steel sheet pile according to a first embodiment of the present invention.
Fig. 5 is a schematic structural view of a joining device of the present invention mated with a male steel sheet pile and a female steel sheet pile.
Fig. 6 is an enlarged schematic view of the area a of fig. 5 according to the present invention.
Fig. 7 is a schematic structural view of a cable-stayed structure according to the present invention.
Fig. 8 is a schematic view of the internal structure of a sleeve according to the present invention.
Fig. 9 is a schematic diagram of a front structure of a male steel sheet pile and a female steel sheet pile according to a second embodiment of the present invention.
Detailed Description
For the purpose of making embodiments of the present invention fall within the scope of the present invention. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as referring to purposes, technical solutions and advantages of the present invention in any way. All other implementations, which can be derived by a person skilled in the art without making any inventive effort, show or imply relative importance or implicitly indicate the number of technical features indicated on the basis of the implementations in the invention. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Embodiment one:
referring to fig. 1 to 9, a foundation pit enclosure structure includes four sides lassen steel sheet piles, the lassen steel sheet piles include a convex steel sheet pile 11 and a concave steel sheet pile 12, two sides of the convex steel sheet pile 11 and the concave steel sheet pile 12 are respectively provided with hook arms 13 with opposite directions, the convex steel sheet pile 11 and the concave steel sheet pile 12 are alternately arranged and are hooked together through the hook arms 13, and the foundation pit enclosure structure further includes: four sets of edge connection mechanisms 20, wherein the edge connection mechanisms 20 comprise mounting seats 21 pre-buried at four corners of the bottom of a foundation pit, connecting devices 22 vertically fixed on the mounting seats 21 and used for fixing Lassen steel sheet piles in two directions, mounting tables 23 arranged at the tops of the connecting devices 22 and used for mounting sandalwood strips, and the connecting devices 22 are used for connecting and fixing the Lassen steel sheet piles on four sides and providing anchor points for the sandalwood strips welded on the Lassen steel sheet piles; a plurality of groups of connecting seam retaining mechanisms, wherein the connecting seam retaining mechanisms comprise a cage device 31 sleeved at the lower ends of the hook arms 13 of the convex steel sheet piles 11 and the hook arms 13 of the concave steel sheet piles 12, and guide slide channels 32 arranged on the inner sides of the convex steel sheet piles 11 and the concave steel sheet piles 12, the cage device 31 clamps adjacent convex steel sheet piles 11 and concave steel sheet piles 12 so as to limit in the transverse direction, and the guide slide channels 32 connect the adjacent convex steel sheet piles 11 and the adjacent concave steel sheet piles 12 so as to limit in the longitudinal direction; the convex side supporting mechanisms comprise inclined pulling structures 41 arranged on the convex steel sheet piles 11, the inclined pulling structures 41 are arranged in grooves formed in one side, far away from the inner wall surface of the foundation pit, of the convex steel sheet piles 11, and soil in the foundation pit can be propped up by the inclined pulling structures 41 when being extruded inwards.
In this embodiment, the pile-type retaining wall is used, which can support soil and play a role in preventing water.
In this embodiment, it can be seen from the figure that the adopted male steel sheet pile 11 and female steel sheet pile 12 are U-shaped structures, i.e. have openings of U-shape, and two ends of the openings extend towards two sides, and the tail ends of the extending positions are provided with hook arms 13, so that the hook arms of the male steel sheet pile 11 and the female steel sheet pile 12 are opposite in direction, so that they can be hooked together, which is part of the prior art and is briefly introduced in the present case.
In the conventional Larson steel sheet pile arrangement, only a mode of four sides Larson steel sheet piles and cement pouring is adopted, but the construction process is limited to a small basement, if in a large-scale underground building or a region with a longer span length, a single thin Larson steel sheet pile is easy to cause problems at a middle section position, and deformation is easy to occur at the arrangement connection position of the two sides of Larson steel sheet piles, so that:
the embodiment firstly proposes to arrange edge connecting mechanisms 20 at four corners of a foundation pit, firstly, positioning a coverage area and a specific position of the whole building envelope by utilizing the edge connecting mechanisms 20, wherein at least one convex steel sheet pile 11 or at least one concave steel sheet pile 12 are connected to two sides of the edge connecting mechanisms 20, so that the rest convex steel sheet piles 11 or the rest concave steel sheet piles 12 are driven in sequence, and the stability of the side of the whole building envelope is ensured to a certain extent because the steel sheet piles at the side most are fixed by the edge connecting mechanisms 20;
the convex steel sheet piles 11 and the concave steel sheet piles 12 are hooked together through the hook arms 13, but the connection is relatively unstable in practice only through the hook arms 13, and due to the uncertainty of soil movement, the hook arms 13 are easy to deform and disintegrate when transverse pulling and longitudinal pulling occur simultaneously, so that the cage device 31 is embedded at the lower ends of the connection positions of the two hook arms 13, the two hook arms 13 can be covered and limited and fixed, thereby forming a relatively good fixing effect on the middle position of the Larson steel sheet piles and avoiding collapse of the long-distance Larson steel sheet piles arranged at the middle position;
through the arrangement of the two steps, the middle position and the side position of the steel sheet pile can play a good role in supporting and limiting, and even in a long-distance and large-area foundation pit, the enclosure structure can achieve the enclosure effect in prediction, so that the stability of earthwork can be ensured in the excavation stage and the later construction stage.
When the convex steel sheet pile 11 contacts with soil, the convex steel sheet pile 11 is arranged convexly towards the soil on the side to be supported, so that the influence on the convex steel sheet pile is larger, and once the soil changes, the first time is influenced, the inclined-pulling structure 41 is arranged on the back side of the convex steel sheet pile 11, and the inner side surface of the convex steel sheet pile 11 is supported and fixed at fixed points, so that the remarkable influence of the soil change on the whole enclosure structure is avoided.
The stability of the male steel sheet pile 11 or the female steel sheet pile 12 connected with the whole edge connecting mechanism 20 is the most important, and whether the whole Larson steel sheet pile is stable or not is directly determined, so the connecting device 22 in the embodiment comprises an outer column 221 for connecting the mounting seat 21 and the mounting table 23, a communication hole is formed in the direction of the outer column 221 close to the Larson steel sheet pile, two clamping rods 222 are fixedly arranged at the inner side of the outer column 221, the hook arms 13 of the male steel sheet pile 11 or the female steel sheet pile 12 penetrate through the communication hole and are buckled on the clamping rods 222, and the clamping rods 222 are arranged in the outer column 221, so that the hook arms 13 on the male steel sheet pile 11 or the female steel sheet pile 12 connected with the edge connecting mechanism 20 can be clamped on the clamping rods 222;
however, in order to avoid the deformation of the hook arm 13 due to the sudden and transverse pulling of the whole structure, the hook arm 13 of the male steel sheet pile 11 or the female steel sheet pile 12 penetrating the communication hole in this embodiment includes an inner mating portion disposed in the outer column 221 and an outer mating portion disposed outside the outer column 221, an outer fastening seat 131 is disposed between the inner mating portion and the outer mating portion, the engagement device 22 further includes an abutment post 223 fixedly connected to two ends of the inner side of the communication hole, and when the hook arm 13 is mated with the clamping rod 222, the abutment post 223 is inserted into the outer fastening seat 131, and by further disposing the abutment post 223 on the outer column 221 and simultaneously disposing the outer fastening seat 131 on the corresponding hook arm 13, a protection latch is disposed at a front end position of the clamping rod 222 mated with the hook arm 13, so as to avoid the impact of the sudden and transverse pulling force on the connection effect between the steel sheet pile and the edge connection mechanism 20.
It should be emphasized that the outer fastening base 131 and the abutment post 223 are matched outside the foundation pit, so that no mismatching phenomenon of automatic assembly is worry, and the outer fastening tool can be used for installation.
Under the condition that soil collapses or normally deforms, a pulling force in the transverse direction or the longitudinal direction is randomly generated on the building envelope, so that the whole building envelope needs to have both longitudinal and transverse anti-dialectic force, as the assembly between the convex steel sheet pile 11 and the concave steel sheet pile 12 is buried in the earth once fixed and is no longer removed, the problem of disassembly is not needed, firstly, the cage device 31 comprises a guide plate 311 pre-buried in the whole foundation pit, the guide plate 311 is positioned between two connecting devices 22, a plurality of sleeve barrels 312 are arranged on the guide plate 311, the sleeve barrels 312 are used for accommodating two hook arms 13 corresponding to the convex steel sheet pile 11 and the concave steel sheet pile 12, the two hook arms 13 are inserted into the sleeve barrels 312 in a splicing manner in the transverse direction, namely the sleeve barrels 312 are sleeved outside the two hook arms 13, in order to prevent the hook arm 13 from moving laterally, a plurality of fins 3121 obliquely pointing to the ground are integrally formed on the inner side of the sleeve barrel 312, a plurality of steel shots are arranged on the outer side of the hook arm 13, the fins 3121 are abutted against the steel shots after the hook arm 13 is clamped on the sleeve barrel 312, the sleeve barrel 312 is provided with the fins 3121 obliquely pointing to the ground, the hook arm 13 in the corresponding area is subjected to shot blasting treatment, the roughness of the surface is changed, the steel sheet pile is fixed once inserted into the sleeve barrel 312, even if the steel sheet pile moves, the steel sheet pile cannot jump again due to small fluctuation, wherein the shot blasting treatment can improve the roughness of the steel sheet pile, and meanwhile, the stability of the steel sheet pile cannot be greatly damaged.
Because the area of the foundation pit is different, the enclosure structure also needs to select different parameters, such as the inclined pull structure 41, when the inclined pull structure 41 is arranged, the length and the supporting force of the inclined pull structure 41 need to be set according to the area of the convex steel sheet pile 11 and the height of the soil supporting surface of the whole foundation pit, in order to adjust the supporting force of the inclined pull structure 41, the inclined pull structure 41 comprises a group of diagonally arranged L-shaped connecting cylinders 411 locked on the inner side plane of the convex steel sheet pile 11, connecting rods 412 inserted on the two L-shaped connecting cylinders 411, L-shaped springs 413 arranged in the L-shaped connecting cylinders 411, the parts of the connecting rods 412 extending into the L-shaped connecting cylinders 411 are abutted on the L-shaped springs 413, and the connecting rods 412 are formed by positive and negative screw rods and two inner screw rods, wherein the positive and negative screw rods are in the prior art, and the length of the connecting rods is calculated in advance in the process of installing the inclined pull structure 41 by workers in advance, so that the matching distance between the inner screw rods and the positive and negative screw rods is set, and the connecting rods 412 can have the best supporting effect on the convex steel sheet 11.
The structure of the cable-stayed structure 41 can improve the strength of the convex steel sheet pile 11 to a certain extent, but also makes certain difficulty for piling the convex steel sheet pile 11, the structure of the cable-stayed structure 41 can improve the detention degree of the cable-stayed structure in the earthwork in the piling process, in this way, the lower part of the cable-stayed structure 41 is also provided with the wedge 42 fixedly connected with the inner side plane of the convex steel sheet pile 11, the bottom of the wedge 42 is a cutting edge, two sides of the wedge 42 are abutted against the inner side of the U-shaped opening of the convex steel sheet pile 11, the wedge 42 is arranged at the bottom of the cable-stayed structure 41, and the wedge 42 is firstly contacted with soil in the process of driving the steel sheet pile, so that the cable-stayed structure 41 is immediately led after breaking a certain gap in the soil, thereby avoiding damage of the cable-stayed structure due to forced piling action in the use process, and meanwhile, the wedge 42 can also play a certain supporting effect on the inner side wall of the U-shaped steel sheet pile.
Embodiment two:
referring to fig. 9, the present embodiment is different from the first embodiment in that: the water resistance of the Larson steel sheet pile is better, especially after the guide plate 311 and the sleeve 312 are arranged, the bottom of the stretched steel sheet pile is regulated, but drainage in a foundation pit is always a difficult problem, distributed water is difficult to collect in a centralized manner, the influence on surrounding soil is just like a timing bomb, for this purpose, the guide chute 32 comprises a flat chute 321 fixed on the convex steel sheet pile 11 or the concave steel sheet pile 12, and an arc chute 322 which is positioned on one side of the convex side supporting mechanism close to the Larson steel sheet pile and communicated with the flat chute 321, and adjacent guide chute 32 arranged on the convex steel sheet pile 11 or the concave steel sheet pile 12 are attached and fixed.
The flat chute 321 can achieve the effect of limiting and guiding water, and the arc chute 322 avoids the whole inclined-pull structure 41, so that water can pass through the guide chute 32 without affecting the arrangement of the inclined-pull structure 41.
Embodiment III:
the invention also provides a construction method of the foundation pit support structure, comprising the following steps:
s1, performing S1; fixing a piece of convex steel sheet pile 11 or concave steel sheet pile 12 on two sides of the edge connecting mechanism 20, and driving four groups of edge connecting mechanisms 20 into four corners of the whole foundation pit to form preliminary positioning;
s2, performing S2; embedding a cage device 31 between two edge connecting mechanisms 20 according to the positioning of the edge connecting mechanisms 20, and enclosing a construction area on the lowest plane of the foundation pit;
s3, performing S3; the inner side of the convex steel sheet pile 11 is provided with a diagonal-pulling structure 41, the length of a connecting rod 412 is adjusted according to the size of a foundation pit and the pressure of soil, then the convex steel sheet pile 11 and the concave steel sheet pile 12 are driven in sequence along an edge connecting mechanism 20, the bottoms of hook arms 13 of the driven convex steel sheet pile 11 and the concave steel sheet pile 12 are spliced to a pre-buried cage device 31, and the edge connecting mechanism 20, the convex steel sheet pile 11 and the concave steel sheet pile 12 on four corners are enclosed into a retaining wall;
s4, performing S4; after the foundation pit digging process is completed, sandal strips or supporting frames are welded between the edge connecting mechanisms 20, the convex steel sheet piles 11 and the concave steel sheet piles 12.
Further, the step S3 further includes: the male steel sheet pile 11 and the female steel sheet pile 12 are attached to each other between the adjacent flat spouts 321 during the alternate driving and form a complete guide passage.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and various modifications and variations may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides a foundation pit enclosure, includes four sides Larson steel sheet pile, larson steel sheet pile includes protruding type steel sheet pile (11) and concave type steel sheet pile (12), and the both sides of protruding type steel sheet pile (11) and concave type steel sheet pile (12) are provided with hook arm (13) opposite in direction respectively, protruding type steel sheet pile (11) and concave type steel sheet pile (12) set up in turn and are in the same place through hook arm (13) hook joint, its characterized in that still includes:
four groups of edge connecting mechanisms (20), wherein the edge connecting mechanisms (20) comprise mounting seats (21) pre-buried at four corners of the bottom of a foundation pit, connecting devices (22) vertically fixed on the mounting seats (21) and used for fixing Lassen steel sheet piles in two directions, mounting tables (23) arranged at the tops of the connecting devices (22) and used for mounting sandal strips, and the connecting devices (22) are used for connecting and fixing the Lassen steel sheet piles on four sides and providing anchor points for the sandal strips welded on the Lassen steel sheet piles;
a plurality of groups of connecting seam retaining mechanisms, wherein the connecting seam retaining mechanisms comprise cage devices (31) sleeved at the lower ends of the hook arms (13) of the convex steel sheet piles (11) and the hook arms (13) of the concave steel sheet piles (12), and guide slide channels (32) arranged on the inner sides of the convex steel sheet piles (11) and the concave steel sheet piles (12), the cage devices (31) clamp adjacent convex steel sheet piles (11) and concave steel sheet piles (12) so as to limit in the transverse direction, and the guide slide channels (32) connect the adjacent convex steel sheet piles (11) and the concave steel sheet piles (12) so as to limit in the longitudinal direction;
the system comprises a plurality of groups of convex side supporting mechanisms, wherein each convex side supporting mechanism comprises a diagonal structure (41) arranged on each convex steel sheet pile (11), each diagonal structure (41) is arranged in a groove on one side, far away from the inner wall surface of a foundation pit, of each convex steel sheet pile (11), and soil in the foundation pit can be propped up by each diagonal structure (41) when being extruded inwards;
the connecting device (22) comprises an outer column cylinder (221) for connecting the mounting seat (21) and the mounting table (23), a communication hole is formed in the direction of the outer column cylinder (221) close to the Lasen steel sheet pile, two clamping rods (222) are fixedly arranged on the inner side of the outer column cylinder (221), and the hook arms (13) of the convex steel sheet pile (11) or the concave steel sheet pile (12) penetrate through the communication hole and are buckled on the clamping rods (222);
the hook arm (13) of the convex steel sheet pile (11) or the concave steel sheet pile (12) penetrating through the communication hole comprises an inner matching part arranged in the outer column cylinder (221) and an outer matching part arranged outside the outer column cylinder (221), an outer buckling seat (131) is arranged between the inner matching part and the outer matching part, the connecting device (22) further comprises an abutting column (223) fixedly connected to two ends of the inner side of the communication hole, and when the hook arm (13) is matched with the clamping rod (222), the abutting column (223) is inserted into the outer buckling seat (131);
the cage device (31) comprises a guide plate (311) which is pre-buried into the whole foundation pit, the guide plate (311) is positioned between two connecting devices (22), a plurality of sleeve barrels (312) which are arranged on the guide plate (311), and the sleeve barrels (312) are used for accommodating two hook arms (13) corresponding to the convex steel sheet piles (11) and the concave steel sheet piles (12).
2. The foundation pit support structure according to claim 1, wherein a plurality of fins (3121) which are obliquely directed to the ground are integrally formed on the inner side of the sleeve (312), a plurality of steel shots are arranged on the outer side of the hook arm (13), and the hook arm (13) is clamped behind the sleeve (312) and the fins (3121) are abutted against the steel shots.
3. A foundation pit enclosure according to claim 1, wherein the guide chute (32) comprises a flat chute (321) fixed to the male steel sheet pile (11) or the female steel sheet pile (12), and an arc chute (322) located on one side of the male side support mechanism close to the lasen steel sheet pile and in communication with the Ping Liucao (321), and adjacent Ping Liucao (321) are fixedly attached.
4. The foundation pit enclosure structure according to claim 1, wherein the cable-stayed structure (41) comprises a group of diagonally arranged L-shaped connecting barrels (411) locked on the inner side plane of the convex steel sheet pile (11), connecting rods (412) inserted on the two L-shaped connecting barrels (411), L-shaped springs (413) arranged in the L-shaped connecting barrels (411), parts of the connecting rods (412) extending into the L-shaped connecting barrels (411) are abutted against the L-shaped springs (413), and the connecting rods (412) are composed of front and back screw rods and two inner screw rods.
5. The foundation pit support structure according to claim 4, wherein a wedge knife (42) fixedly connected to the inner side plane of the convex steel sheet pile (11) is further arranged below the inclined pull structure (41), the bottom of the wedge knife (42) is a cutting edge, and two sides of the wedge knife (42) are abutted to the inner side of the U-shaped opening of the convex steel sheet pile (11).
6. A method of constructing a foundation pit enclosure comprising the foundation pit enclosure of any one of claims 1-5, comprising the steps of:
s1, performing S1; fixing a piece of convex steel sheet piles (11) or concave steel sheet piles (12) on two sides of the edge connecting mechanisms (20), and driving four groups of edge connecting mechanisms (20) into four corners of the whole foundation pit to form preliminary positioning;
s2, performing S2; embedding a cage device (31) between two edge connecting mechanisms (20) according to the positioning of the edge connecting mechanisms (20), and enclosing a construction area on the lowest plane of the foundation pit;
s3, performing S3; the method comprises the steps that a diagonal-pulling structure (41) is arranged on the inner side of a convex steel sheet pile (11), the length of a connecting rod (412) is adjusted according to the size of a foundation pit and the pressure of soil, then the convex steel sheet pile (11) and a concave steel sheet pile (12) are driven in sequence along an edge connecting mechanism (20), the bottoms of hook arms (13) of the convex steel sheet pile (11) and the concave steel sheet pile (12) are plugged into a pre-buried cage device (31), and the edge connecting mechanism (20), the convex steel sheet pile (11) and the concave steel sheet pile (12) on four corners are enclosed into a retaining wall;
s4, performing S4; after the foundation pit digging process is completed, sandal strips or supporting frames are welded between the edge connecting mechanisms (20), the convex steel plate piles (11) and the concave steel plate piles (12).
7. The method for constructing a foundation pit enclosure of claim 6, wherein S3 further comprises: the convex steel sheet piles (11) and the concave steel sheet piles (12) are mutually attached between adjacent flat chute (321) in the alternate driving process and form a complete guide channel.
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| JP2010236274A (en) * | 2009-03-31 | 2010-10-21 | Jfe Steel Corp | Steel sheet pile wall and construction method therefor, and synthetic floor panel structure using the steel sheet pile wall and construction method for the synthetic floor panel structure |
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| CN218175858U (en) * | 2022-08-31 | 2022-12-30 | 张德平 | Supporting construction of Larsen steel sheet pile |
| CN219710321U (en) * | 2023-03-24 | 2023-09-19 | 程荣波 | Foundation pit collapse-preventing supporting device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010236274A (en) * | 2009-03-31 | 2010-10-21 | Jfe Steel Corp | Steel sheet pile wall and construction method therefor, and synthetic floor panel structure using the steel sheet pile wall and construction method for the synthetic floor panel structure |
| CN215593963U (en) * | 2021-03-31 | 2022-01-21 | 中交第三航务工程勘察设计院有限公司 | Sheet pile joint connection structure |
| CN113309071A (en) * | 2021-05-31 | 2021-08-27 | 中南大学 | Stably-connected cap-shaped steel sheet pile and mounting method |
| CN217629831U (en) * | 2022-05-09 | 2022-10-21 | 中建海峡建设发展有限公司 | Larsen steel sheet pile enclosing structure for cofferdam |
| CN218175858U (en) * | 2022-08-31 | 2022-12-30 | 张德平 | Supporting construction of Larsen steel sheet pile |
| CN219710321U (en) * | 2023-03-24 | 2023-09-19 | 程荣波 | Foundation pit collapse-preventing supporting device |
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