CN112627190A - Foundation pit channel steel sheet pile section steel supporting system and construction method - Google Patents
Foundation pit channel steel sheet pile section steel supporting system and construction method Download PDFInfo
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- CN112627190A CN112627190A CN202011477994.8A CN202011477994A CN112627190A CN 112627190 A CN112627190 A CN 112627190A CN 202011477994 A CN202011477994 A CN 202011477994A CN 112627190 A CN112627190 A CN 112627190A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 480
- 239000010959 steel Substances 0.000 title claims abstract description 480
- 238000010276 construction Methods 0.000 title claims abstract description 39
- 238000009412 basement excavation Methods 0.000 claims abstract description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 21
- 238000013461 design Methods 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 239000002689 soil Substances 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 6
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 4
- 239000004567 concrete Substances 0.000 claims description 3
- 239000011378 shotcrete Substances 0.000 claims 1
- 230000008569 process Effects 0.000 description 6
- 230000003213 activating effect Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 229910000746 Structural steel Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- 101150054854 POU1F1 gene Proteins 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/06—Foundation trenches ditches or narrow shafts
- E02D17/08—Bordering or stiffening the sides of ditches trenches or narrow shafts for foundations
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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
- E02D19/22—Lining sumps in trenches or other foundation pits
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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
- E02D5/03—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
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
- E02D5/08—Locking forms; Edge joints; Pile crossings; Branch pieces
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Abstract
The invention discloses a foundation pit channel steel sheet pile profile steel supporting system and a construction method, wherein the supporting system comprises a support structure laid along the inner side wall of a foundation pit groove, an upper supporting structure which is arranged at two ends of the opening part of the foundation pit in a crossing manner and is fixed on the side wall of the upper end of the support structure, and a plurality of lower supporting structures which are arranged below the opening part and above the bottom of the foundation pit groove, wherein two ends of the lower supporting structure are connected with the support structures arranged at two sides in the foundation pit groove; the lower supporting structure comprises a lower steel enclosing purlin and a lower profile steel supporting beam, the lower steel enclosing purlin and the lower profile steel supporting beam are respectively arranged on the enclosing structure in multiple layers, the lower steel enclosing purlin is connected to the surface of the enclosing structure through bolts along the surrounding direction of the inner side wall of the foundation pit groove, and the lower profile steel supporting beam is arranged in multiple parallel in the width direction of the foundation pit groove. The construction method can effectively solve the problem that prestress can be applied to the supporting system when the excavation depth of the foundation pit groove is deep, can better prevent the foundation pit groove from deforming, and ensures that the supporting system is uniformly stressed integrally.
Description
Technical Field
The invention relates to the technical field of foundation pit construction, in particular to a foundation pit channel steel plate pile section steel supporting system and a construction method.
Background
With the rapid development of social economy and the shortage of urban land resources, deep foundation pit (groove) engineering has become a development trend of modern buildings, and the stability of the foundation pit (groove) and the safety and nature of the surrounding environment become the focus of attention of all parties. Under the conditions that the land resources are increasingly tense, the engineering geological conditions are more and more complex, and the environmental protection problem is more and more prominent, the traditional foundation pit (groove) supporting forms, such as slope-laying excavation, cast-in-situ bored piles, retaining walls and reinforced concrete inner supports and the like, can not meet the market requirements. At present, in the construction process of a deep foundation pit (groove), a Larsen steel sheet pile is often adopted for supporting. When the excavation depth of a foundation pit (groove) is deep and the bending resistance of the steel sheet pile is insufficient, a supporting system is required to support and reinforce, and the Larsen steel sheet pile supporting system usually adopts a form of surrounding purlin and horizontal support. The early-used supporting system encloses the purlin and adopts the welded form with horizontal support to be connected, and prestressing force can't be exerted, and control foundation ditch (groove) that can not be better warp, and use the welding as the owner, and the material loss is big, and the low construction quality of turnover rate is not high, leads to construction progress, quality to receive the influence.
Disclosure of Invention
The invention aims to provide a steel supporting system for a foundation pit channel steel plate pile and a construction method, which can effectively solve the problem that when the excavation depth of a foundation pit is deeper, a steel plate pile has good pressure resistance, prestress can be applied to a supporting system, the deformation of the foundation pit can be better prevented, the integral stress of the supporting system is ensured to be uniform, the prestress loss is reduced, and the eccentric stress and the stress loss are avoided. In order to achieve the above object, the present invention adopts the following technical effects:
according to one aspect of the invention, a foundation pit channel steel sheet pile profile steel supporting system is provided, which comprises a support structure laid along the inner side wall of a foundation pit groove, an upper supporting structure arranged at two ends of the opening part of the foundation pit in a crossing manner and fixed on the side wall of the upper end of the support structure, and a plurality of lower supporting structures arranged below the opening part and above the bottom of the foundation pit groove, wherein two ends of each lower supporting structure are connected with the support structures arranged at two sides in the foundation pit groove; the lower supporting structure comprises a lower steel enclosing purlin and a lower profile steel supporting beam, the lower steel enclosing purlin and the lower profile steel supporting beam are arranged on the enclosing structure respectively in multiple layers, the lower steel enclosing purlin is connected to the surface of the enclosing structure through bolts along the surrounding direction of the inner side wall of the foundation pit groove, the lower profile steel supporting beam is arranged in the width direction of the foundation pit groove in multiple parallel, and the two ends of the lower profile steel supporting beam are connected with the steel enclosing purlin through the bolts respectively.
In a further preferred mode of the scheme, at least one drainage square culvert is respectively arranged at two ends and two side walls of the bottom of the foundation pit, the enclosure structure comprises a plurality of steel sheet piles which are vertically fastened with each other and are laid on the inner side wall of the foundation pit groove, a plurality of layers of triangular brackets are arranged on the steel sheet pile along the vertical direction, the upper supporting structure and the lower steel purlin are horizontally and correspondingly arranged on each layer of triangular brackets respectively, the two ends of the lower section steel supporting beam are detachably connected with the lower steel purlin through bolts, the lower steel purlin at the bottom of the foundation pit groove is arranged between the inner side wall of the foundation pit groove and the outer wall of the drainage square culvert, an upper steel circulation head is arranged at the middle part and the two ends of the upper steel purlin and at one end part of the upper steel supporting beam, an upper jack is arranged in the upper steel circulation head, one end part of the upper steel supporting beam is in transmission connection with the upper steel purlin through an output shaft of the upper jack.
According to the scheme, the upper supporting structure comprises two upper steel surrounding purlins which parallelly stretch over the groove opening part of the foundation pit and a plurality of upper steel supporting beams which are parallelly connected between the two upper steel surrounding purlins, the upper steel surrounding purlins are arranged on the steel sheet pile along the length direction of the groove opening part of the foundation pit, and the upper steel surrounding purlins are fixed on the outer wall of the steel sheet pile through bolts and cross triangular brackets.
In a further preferable mode of the above scheme, a pull pile is arranged on the outer side around the edge of the opening of the foundation pit groove, an iron chain or an iron pull rope connected with the enclosure structure is arranged on the pull pile, and a fence is arranged on the pull pile.
According to a further preferable scheme, the steel sheet piles are provided with groove bodies, the edges of the groove bodies are provided with buckling wings which are bent outwards, the buckling wings are arranged on the outer sides of the edges of the steel sheet piles along the extending direction of the groove bodies, and each steel sheet pile is mutually spliced and connected in series through the buckling wings.
According to the scheme, the H-shaped supporting steel piles are arranged on the back of the groove body of the adjacent steel plate pile, extend to the bottom from the opening of the foundation pit groove, and are connected with the back of the groove body through bolts or pins.
The above scheme is further preferable, the cross section of the tank body is a triangular, circular arc, square or isosceles trapezoid cross section.
According to the scheme, the two ends of the lower steel supporting beam are connected to the lower steel surrounding purlin through lower steel loose heads respectively, lower jacks are arranged at the middle part and the two ends of the lower steel surrounding purlin on each layer respectively and are arranged at one end part of the lower steel supporting beam respectively, the lower jacks are arranged in the lower steel loose heads, and one end part of the lower steel supporting beam is in transmission connection with the lower steel surrounding purlin through output shafts of the lower jacks.
According to the scheme, the outer side wall of the lower steel circulation head is provided with the reinforced steel plate, and the reinforced steel plate is sequentially connected to the end parts of the lower steel circulation head and the lower section steel supporting beam through bolts.
According to another aspect of the invention, the invention provides a construction method of a foundation pit channel steel sheet pile section steel supporting system, which comprises the following steps:
step 1: forming a foundation pit groove by excavating a groove according to construction measurement positioning data, leveling a field according to the drawing size requirement of the foundation pit groove, splicing and installing the enclosure structure by adopting steel sheet piles which are mutually connected in series, performing elevation lofting on the steel sheet piles before installation, marking the steel sheet piles, the upper steel purlin and the lower steel purlin, then hoisting the steel sheet piles into the foundation pit groove, inserting the steel sheet piles to form the enclosure structure, and enabling the pile tops of the steel sheet piles to be higher than the opening part of the foundation pit groove and level to the ground;
step 2: mounting a triangular bracket on the outer wall of the steel sheet pile according to the marked position, and splicing the upper steel purlins on the ground, wherein equal-strength connection is required to be ensured; firstly, the spliced upper steel purlin is lifted and placed on a triangular support, the upper steel purlin is in close contact with a steel sheet pile, two ends of the upper steel purlin are guaranteed to stretch across a support table at the edge of the opening part at two ends of a foundation pit groove, an upper steel supporting beam is arranged along the upper steel purlin every 3-4 meters, one end of the upper steel supporting beam is fixed on the upper steel purlin, the other end of the upper steel supporting beam is connected to the upper steel purlin through an upper steel moving head so as to be spliced to form a supporting structure on the foundation pit groove, the length of a steel support of the upper steel supporting beam is 10-30 cm shorter than the width of the foundation pit groove, and the elevation deviation of two ends of the upper supporting beam is not more than 20mm and L0/600，L0The length of the upper steel support beam;
and step 3: an upper jack is arranged in the upper steel activating head, and the upper jack is started to enable an upper steel supporting beam to be stable and tightly press an upper steel purlin connected to two sides of the foundation pit groove, so that the upper steel purlin is tightly pressed at the upper end of the steel sheet pile, and the side wall of the upper end of the foundation pit groove is supported and protected;
and 4, step 4: when a certain depth is excavated, a first lower supporting structure is formed by installing and splicing the bottom of a newly-excavated foundation pit groove according to the steps 2 to 3, namely, the spliced lower steel purlin is firstly hoisted and placed on a triangular bracket, the lower steel purlin is in close contact with a steel sheet pile, the two ends of the lower steel purlin are supported on supporting tables at the two ends of the notch part of the foundation pit in a crossing manner, a lower steel supporting beam is arranged on the lower steel purlin at intervals of 3-4 meters, one end of the lower steel supporting beam is fixed on the lower steel purlin, and the other end of the lower steel supporting beam is connected to the lower steel purlin through a lower steel loose head so as to be convenient for the lower steel purlinThe first lower supporting structure is formed by splicing, wherein the length of the steel support of the lower section steel supporting beam is 10-30 cm shorter than the width of the groove of the foundation pit, and the elevation deviation of the two ends of the section steel supporting beam is not more than 20mm and L1/600，L1The length of the lower profile steel support beam;
and 5: installing a lower jack in a chute of the lower steel loose joint, starting the lower jack to push out the lower steel supporting beam to apply prestress to the lower steel purlin, then pushing a steel wedge into the chute of the lower steel loose joint and striking tightly, wherein the length of the steel wedge extending into the lower steel loose joint is not less than 20cm, so that a lower supporting structure is installed on each layer of triangular bracket, and downward excavation is continued on the first lower supporting structure 4; when the excavation depth is reached, installing and splicing the bottom of the newly excavated foundation pit to form a second lower supporting structure according to the steps 2 to 3, then continuing to perform foundation pit earthwork excavation, and performing construction in the same way until the elevation of the bottom of the newly excavated foundation pit reaches the design requirement, wherein the lower jacks are symmetrically and equidistantly arranged on two sides of the supporting axis of the lower steel piston head and are required to synchronously apply pressure; the pressure of the lower jack is slowly applied, the prestress is required to be a designed value, and after the pressure is stable, the reinforcement connection is carried out again through the reinforced steel plate; in the process of applying pressure, when the bending of the movable joint or the supporting point or the cracking of the welding point is abnormal, the pressure is removed, the reason is found out and appropriate measures are taken, then the pressure is continuously applied, after the application of prestress is finished, the length of the head and the neck of the lower steel movable joint extending out of the lower steel supporting beam is not more than 30cm, otherwise, channel steel is welded at the two ends of the lower movable joint to fix the lower steel movable joint after the prestress is applied; after the prestress is applied, a gap between the end part of the lower section steel supporting beam and the lower steel purlin is tightly cushioned by a steel plate; when the soil quality is poor or the excavation depth of the foundation pit is deep, in order to strengthen the lateral pressure of the steel sheet pile against the foundation soil, an H-shaped supporting steel pile is inserted into the back of the steel sheet pile.
Step 6: after excavation of the foundation pit trench to a construction elevation, constructing a concrete cushion layer at the bottom of the foundation pit trench, constructing a drainage square culvert in the foundation pit trench, when the drainage square culvert collides with a lower profiled steel support beam to influence construction, removing a lower support structure after a bottom plate support-changing force-transmitting belt reaches 70% of a design strength, removing the lower support structure from bottom to top, then backfilling earth to each lower support structure, removing the rest lower support steel surrounding purlin and the lower profiled steel support beam, removing the upper support structure after backfilling earth and pulling out a steel sheet and an H-shaped support steel pile, wherein the length of each steel sheet pile is no more than 6m, and the height between each layer of lower support structures is 5m-6m (namely, one lower support structure is arranged at intervals of 5m-6 m); when the steel piston is dismantled, a load is gradually unloaded from the lower profile steel supporting beam by using a 100-ton jack, the iron plug is knocked, the wedge block is loosened, the wedge block is taken out, then the lower jack in the steel piston head and the 100-ton jack are sequentially decompressed and are completely loosened, the 100-ton jack is moved away, and finally the lower profile steel supporting beam is controlled to be lifted out of the foundation pit groove.
In summary, the invention adopts the above technical scheme, and the invention has the following technical effects:
(1) the invention adopts Larsen steel sheet piles and profile steel supports to form a supporting system, has no construction forms of cement stirring, welding and the like in the traditional process, can repeatedly use component materials, and has the characteristics of short construction period, low risk, high efficiency, easy recovery and the like
(2) The steel purlin and the section steel supporting beam are H-shaped steel with threaded holes, all sections are tightly and firmly spliced, the H-shaped steel is spliced by bolts, the traditional steel structure welding is avoided, and the construction safety coefficient is improved. The section steel is provided with a plurality of bolt holes, the triangular support bracket is fixed on the steel sheet pile through high-strength bolts or welded connection, the section steel can be adjusted to be in a horizontal state in real time according to the field requirement, anti-falling measures are not required to be additionally arranged, and the construction process is optimized.
(3) The utility model discloses a steel enclosing purlin and shaped steel supporting beam, including the jack, the adjustable head is equipped with at loose head and supplies voussoir male spout, set up the jack in the spout, the steel encloses purlin and shaped steel supporting beam and sticiss after adjusting through the jack, the steel sheet connection is strengthened to the rethread is firm, it is even to guarantee to strut the whole atress of system, reduce prestressing loss and avoid eccentric atress and stress loss, thereby it is darker to have solved when the excavation depth of foundation ditch groove effectively, make the steel sheet pile have fine bending resistance, can exert prestressing force to the system of strutting, can be better prevent that the.
Drawings
FIG. 1 is a schematic sectional structural view of a foundation pit channel steel sheet pile section steel supporting system of the invention;
FIG. 2 is a schematic top view of a foundation pit channel steel sheet pile section steel supporting system of the invention;
FIG. 3 is a schematic view of the mounting structure of the lower support structure of the present invention;
FIG. 4 is a schematic view of the mounting structure of the upper support structure of the present invention;
FIG. 5 is a schematic structural view of the enclosure of the present invention;
in the drawing, a foundation pit groove 1, a building enclosure 2, an upper supporting structure 3, a lower supporting structure 4, a drainage square culvert 5, a lower steel winding head 6, a reinforced steel plate 8, a supporting table 10, a pull pile 11, an iron chain or iron pull rope 12, a steel plate pile 20, a triangular bracket 21, an H-shaped supporting steel pile 22, an upper steel purlin 30, an upper steel supporting beam 31, an upper jack 32, an upper steel winding head 33, a groove body 200, a lower steel purlin 40, a lower steel supporting beam 41, a groove body 200 and fastening wings 201.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings by way of examples of preferred embodiments. It should be noted, however, that the numerous details set forth in the description are merely for the purpose of providing the reader with a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.
As shown in fig. 1, 2 and 3, the support system according to the present invention includes an enclosure structure 2 laid along the inner side wall of a foundation pit groove 1, an upper support structure 3 crossing both ends of the mouth of the foundation pit groove 1 and fixed on the side wall of the upper end of the enclosure structure 2, and a plurality of lower support structures 4 arranged below the mouth and above the bottom of the foundation pit groove 1, both ends of the lower support structures 4 are connected with the enclosure structures arranged on both sides in the foundation pit groove 1, the enclosure structures 2, the upper support structure 3 and the lower support structure 4 are respectively arranged on the side wall of the foundation pit groove 1, and prestress is applied to the side wall of the foundation pit groove 1 for supporting, so as to prevent the foundation pit groove from collapsing; the lower supporting structure 4 comprises a lower steel enclosing purlin 40 and a lower steel supporting beam 41, multiple layers of the lower steel enclosing purlin 40 are arranged on the enclosure structure 2 respectively, the lower steel enclosing purlin 40 is connected to the surface of the enclosure structure 2 through bolts along the surrounding direction of the inner side wall of the foundation pit groove 1, multiple lower steel supporting beams 41 which are parallel to each other are arranged in the width direction of the foundation pit groove 1, and the two ends of each lower steel supporting beam 41 are connected with the lower steel enclosing purlin 40 through bolts respectively. The outer side of the periphery of the opening part of the foundation pit groove 1 is provided with a pull pile 11, the pull pile 11 is provided with an iron chain or iron pull rope 12 connected with the enclosure structure 2, the enclosure structure 2 is tensioned through the iron chain or iron pull rope 12 to prevent the enclosure structure 2 from being moved, a fence (not shown) is arranged on the pull pile 10 to prevent earth outside the foundation pit groove from entering the foundation pit groove, and a drainage ditch is arranged between the pull pile 10 and the enclosure structure 2 to enable rainwater to flow into the foundation pit groove, prevent the rainwater from brushing the foundation pit groove and prevent the foundation pit groove from collapsing. At least one drainage square culvert 5 is respectively arranged at two ends and two side walls of the bottom of the foundation pit 1, the enclosure structure 2 comprises a plurality of steel sheet piles 20 which are vertically fastened with each other and are laid on the inner side wall of the foundation pit groove 1, a plurality of layers of triangular brackets 21 are arranged on the steel sheet pile 20 along the vertical direction, the triangular brackets 21 realize the installation of angle braces and splayed braces, the supporting angle of the triangular bracket 21 is 30 degrees or 45 degrees, the upper supporting structure 3 and the lower steel purlin 40 are horizontally and correspondingly arranged on each layer of the triangular bracket 21, the two ends of the lower profile steel support beam 41 are detachably connected with the lower steel purlin 40 through bolts, the lower steel enclosing purlin 40 at the bottom of the foundation pit groove 1 is arranged between the inner side wall of the foundation pit groove 1 and the outer wall of the drainage square culvert 5, and the drainage square culvert 5 can be used for supporting the lower steel enclosing purlin 40 and can also be used for conveniently draining water or laying some or pipeline electric wires in the drainage square culvert 5; the lower steel purlin 40 arranged in the supporting system is positioned on the inner side of the steel sheet pile, the inner support is used for supporting the lower steel purlin 40, and the lower steel purlin 40 and the lower section steel supporting beam 41 form an inner support frame structure system; lower steel encloses the tip below of purlin 40 and sets up triangular bracket 21 on steel sheet pile 20 for steel encloses purlin 40 under the support, makes down steel enclose purlin 40 and hug closely on steel sheet pile 20, and acts on steel sheet pile 20 and contradict on the lateral wall in foundation ditch groove, and triangular bracket 21 and steel sheet pile 20 weld, and triangular bracket 21 brace node all adopts high-strength bolted connection, and overall stability is firm, installs and demolishs the convenience. The triangular bracket 21 can enable the steel enclosing purlin to be in close contact with the steel sheet piles, and meanwhile, the steel enclosing purlin is kept in a horizontal position state, so that the steel supporting beams on the steel enclosing purlin are supported between the enclosing purlin beams in a horizontal state.
In the invention, as shown in fig. 1 and 4, the upper supporting structure 3 comprises two upper steel purlins 30 which parallelly cross over the opening of the foundation pit groove 1 and a plurality of upper steel supporting beams 31 which are parallelly connected between the two upper steel purlins 30, the upper steel purlins 30 are arranged on the steel sheet pile 20 along the length direction of the opening of the foundation pit groove 1, and the upper steel purlins 30 are fixed on the outer wall of the steel sheet pile 20 through bolts and over-triangular brackets 21; the edges of the mouth parts of the two ends of the foundation pit groove 1 are lower than the edges of the side parts, two ends of an upper steel purlin 30 are made to cross over a support table 10 on the edges of the mouth parts of the two ends of the foundation pit groove 1, an upper steel activating head 33 is arranged at the middle part and two end positions of the upper steel purlin 30 and at one end part of an upper steel supporting beam 31, an upper jack 32 is arranged in the upper steel activating head 33, one end part of the upper steel supporting beam 31 is in transmission connection with the upper steel purlin 30 through an output shaft of the upper jack 32, the upper steel activating head 33 is connected to the end part of one end of the upper steel supporting beam 31, after the upper steel supporting beam 31 is hoisted on the upper steel purlin 30 at the mouth part of the foundation pit groove 1, because the upper jack 32 is arranged in the upper steel activating head 33, the upper jack 32 can be started to enable the output shaft to push the upper steel purlin 30, so that the upper steel supporting beam 31 is stable and tightly pressed on the upper purlin 30, the upper steel purlin 30 is tightly pressed on the upper end of the steel sheet pile 20 to support and protect the side wall of the upper end of the foundation pit groove 1, and the steel loose head is arranged at the end part of the steel supporting beam to realize that the steel supporting can apply prestress and enhance the supporting rigidity, so that the deformation is well controlled.
As shown in fig. 1 and 5, the steel sheet pile 20 has a trough body 200, fastening wings 201 bent outward are provided at the edges of the trough body 200, the fastening wings 201 are arranged at the outer sides of the edges of the steel sheet pile 20 along the extending direction of the trough body 200, each steel sheet pile 20 is mutually spliced, fastened and connected in series through the fastening wings 201, so that a larsen steel sheet pile structure is formed, and therefore, the steel sheet piles can be mutually spliced and laid on the side wall of the foundation pit groove 1 by hoisting, the dismounting and the mounting are simple, and the stable laying and the mounting can be realized; an H-shaped supporting steel pile 22 is arranged at the back of the groove body 200 of the adjacent steel sheet pile 20, the H-shaped supporting steel pile 22 extends from the opening of the foundation pit groove 1 to the bottom, and the H-shaped supporting steel pile 22 is connected with the back of the groove body 200 through a bolt or a pin, so that the steel sheet pile 20 is convenient to disassemble and assemble; the cross section of the trough body 200 is a triangular, circular arc, square or isosceles trapezoid cross section, and a stone layer or a soil layer can be filled in the trough shape of the H-shaped supporting steel pile 22 and the trough body 200 for stably supporting on the side wall of the foundation pit trough 1; the supporting structure has the advantages that the structural steel supporting beam can be supported between the enclosing purlin beams in a horizontal state, so that the supporting capacity and supporting stability of the structural steel supporting beam on the foundation pit groove are guaranteed, the using amount of the structural steel can be reduced, the construction cost is reduced, earthwork excavation is facilitated, a supporting structure is formed between the groove bodies 200 of the steel sheet piles 20, and the supporting structure has good waterproof and impervious performance, strong waterproof and impervious performance, low cost and high efficiency. The stress loss of the supporting structure can be reduced, the safety and stability of the foundation pit and groove system are ensured, the construction process is simplified, and the construction cost is reduced.
As shown in fig. 1, 3 and 4, two ends of the lower steel supporting beam 41 are respectively connected to the lower steel purlin 40 through a lower steel loose joint 6, a lower jack 7 is respectively arranged at the middle part and two ends of each layer of the lower steel purlin 40 and at one end of the lower steel supporting beam 41, the lower jack 7 is arranged in the lower steel loose joint 6, one end of the lower steel supporting beam 41 is in transmission connection with the lower steel purlin 40 through an output shaft of the lower jack 7, a reinforcing steel plate 8 is arranged on the outer side wall of the lower steel loose joint 6, the reinforcing steel plate 8 is sequentially connected to the lower steel loose joint 6 and the end of the lower steel purlin 41 through bolts, the length of the steel loose joint 6 is adjusted after the lower steel supporting beam 41 is placed on the lower steel loose joint 6, then the lower jack 7 can be started to enable the output shaft to push the lower steel purlin 40, the lower steel supporting beam 41 stabilizes the lower steel supporting beam 41, The lower steel purlins 30 connected to two sides below the opening of the foundation pit groove 1 are pressed tightly, so that the lower steel purlins 40 are pressed tightly on the side walls of the steel sheet piles 20, the side walls below the opening of the foundation pit groove 1 are supported and protected, and the side walls are reinforced through reinforcing steel plates 8 after being adjusted stably; during installation and construction of a supporting frame structure system in the foundation pit groove, the hoisting is placed according to the measurement of a design drawing, the whole support assembly is carried out at the edge of the foundation pit groove 1, then the whole support assembly is hoisted to a specified position, and the support installation is completed by adjusting the fine adjustment support length of the adjustable head. And then, applying prestress by using a jack according to design requirements, and performing construction of other layers after the prestress is applied in place.
According to another aspect of the invention, with reference to fig. 1 to 5, the invention provides a construction method of a steel support system for a channel steel plate pile of a foundation pit, which comprises the following steps:
step 1: digging a groove according to construction measurement positioning data to form a foundation pit groove 1, leveling a field according to the drawing size requirement of the foundation pit groove 1, connecting and splicing steel sheet piles 20 in series to install an enclosure structure 2, performing elevation lofting on the steel sheet piles 20 before installation, marking the steel sheet piles 20, an upper steel purlin 30 and a lower steel purlin 40, hoisting the steel sheet piles 20 into the foundation pit groove 1, inserting the steel sheet piles to form the enclosure structure 2, and enabling the pile tops of the steel sheet piles 20 to be higher than the opening part of the foundation pit groove 1 and level to the ground; step 2: according to the marked position, mounting a triangular bracket 21 on the outer wall of the steel sheet pile 20, and splicing the upper steel purlins 30 on the ground, wherein equal-strength connection is required to be ensured; firstly, the spliced upper steel purlin 30 is lifted and placed on a triangular bracket 21, the upper steel purlin 30 is in close contact with a steel sheet pile 20, two ends of the upper steel purlin 30 are guaranteed to stretch across a support table 10 at the edge of two end openings of a foundation pit groove 1, one upper steel supporting beam 31 is arranged along the upper steel purlin 30 every 3-4 meters, one end of the upper steel supporting beam 31 is fixed on the upper steel purlin 30, the other end of the upper steel supporting beam 31 is connected to the upper steel purlin 30 through an upper steel living head 33, so that a supporting structure 3 on the foundation pit groove 1 is formed through splicing, wherein the steel supporting length of the upper supporting beam 31 is 10-30 cm shorter than the width of the foundation pit groove 1, and the elevation deviation of two ends of the upper steel supporting beam 31 is not more than 20mm and L0/600，L0The length of the upper steel support beam;
and step 3: an upper jack 32 is arranged in the upper steel circulation head 33, the upper jack 32 is started to enable an upper steel supporting beam 31 to be stable and tightly press an upper steel surrounding purlin 30 connected to two sides of the foundation pit groove 1, the upper steel surrounding purlin 30 is tightly pressed on the upper end of the steel sheet pile 20, and the side wall of the upper end of the foundation pit groove 1 is supported and protected;
and 4, step 4: when the excavation reaches a certain depth, the bottom of the newly excavated foundation pit is assembled and spliced according to the steps 2 to 3 to form a first lower supporting structure 4, namely, firstly, the spliced lower steel purlin 40 is lifted and placed on the triangular bracket 21, and the lower steel purlin 40 is tightly contacted with the steel sheet pile 20, and the two ends of the lower steel purlin 40 are supported on the supporting tables 10 which are arranged at the two ends of the opening part of the foundation pit groove 1, one lower steel supporting beam 41 is arranged on the lower steel purlin 40 at intervals of 3-4 meters, one end of the lower steel supporting beam 41 is fixed on the lower steel purlin 40, the other end of the lower steel supporting beam 41 is connected on the lower steel purlin 40 through a lower steel loose head 6 so as to be spliced to form a first lower supporting structure 4, wherein, the length of the 41 steel support of the lower section steel support beam is 10-30 cm shorter than the width of the groove of the foundation pit, and the elevation deviation of two ends of the section steel support beam is not more than 20mm and L.1/600，L1The length of the lower profile steel support beam;
and 5: installing a lower jack 7 in a chute of the lower steel loose joint 6, starting the lower jack 7 to push out a lower steel support beam 41 to apply prestress to the lower steel purlin 40, then pushing a steel wedge into the chute of the lower steel loose joint 6 and striking tightly, wherein the length of the steel wedge extending into the lower steel loose joint 6 is not less than 20cm, so that a lower support structure 4 is installed on each layer of triangular bracket 21, and downward excavation is continued on the first lower support structure 4; when the newly excavated foundation pit groove 1 is excavated to a certain depth, a second lower supporting structure 4 is formed by installing and splicing the bottom of the newly excavated foundation pit groove 1 according to the steps 2 to 3, then foundation pit earthwork excavation is continued, and construction is repeated until the elevation of the bottom of the foundation pit groove reaches the design requirement, wherein the lower jacks 7 are symmetrically and equidistantly arranged on two sides of the supporting axis of the lower steel loose joint 6 and are required to synchronously apply pressure; the pressure of the lower jack 7 is slowly applied, the prestress is required to be a designed value, and after the pressure is stable, the reinforcement connection is carried out again through the reinforced steel plate 8; in the process of applying pressure, when the movable joint or the supporting point is bent or the welding point is cracked, the pressure is removed, the reason is found out and appropriate measures are taken, then the pressure is continuously applied, after the prestress application is finished, the length of the head and the neck of the lower steel movable joint 6 extending out of the lower steel support beam 41 is not more than 30cm, otherwise, channel steel is welded at the two ends of the lower movable joint to fix the lower steel movable joint after the prestress application is finished; after the prestress is applied, a gap between the end part of the lower profile steel support beam 41 and the lower steel purlin 40 is tightly cushioned by a steel plate; when the soil quality is poor or the excavation depth of a foundation pit groove is deep, in order to strengthen the lateral pressure of the steel sheet pile against the foundation soil, an H-shaped supporting steel pile 22 is inserted into the back of the steel sheet pile 20;
step 6: after the foundation pit groove earthwork is excavated to a construction elevation, constructing a concrete cushion layer at the bottom of the foundation pit groove 1, and then constructing a drainage square culvert 5 in the foundation pit groove, wherein when the drainage square culvert 5 collides with a lower section steel support beam 41 to influence construction, a lower support structure 4 can be detached after a bottom plate support changing force transmission belt reaches 70% of a design strength; removing the lower supporting structures 4 from bottom to top, then backfilling earthwork until each lower supporting structure 4, removing the rest lower supporting steel purlin 40 and the lower profile steel supporting beam 41, removing the upper supporting structure 3 after backfilling the earthwork, and pulling out the steel sheet piles 20 and the H-shaped supporting steel piles 22, wherein the length of each steel sheet pile 20 is not more than 6m, and the height between each layer of lower supporting structure 4 is 5m-6m (one lower supporting structure 4 is arranged every 5m-6 m); when the steel support beam is dismantled, a load is gradually unloaded from the lower section steel support beam 41 by using a 100-ton jack, the iron plug is knocked, the wedge block is loosened, the wedge block is taken out, then the lower jack 32 in the steel piston head and the 100-ton jack are sequentially decompressed and are completely loosened, the 100-ton jack is removed, and finally the lower section steel support beam 41 is controlled to be lifted out of the foundation pit groove 1. The construction method of the novel steel sheet pile section steel supporting system which is detachably assembled is adopted, the problems that when the excavation depth of a foundation pit groove is deep and the bending resistance of a steel sheet pile is insufficient, the supporting system is welded, supported and reinforced, prestress cannot be applied, deformation of the foundation pit groove cannot be prevented better, green construction with more economical steel consumption, higher material turnover rate and more guaranteed construction quality is achieved are solved, supporting members formed by the supporting system can be processed in advance to form standardized members, assembling is carried out according to the size of the foundation pit groove, for example, steel purlins are assembled in advance by adopting standard parts of 3m and 6m, the construction method is high in adaptability, light, flexible, high in standardization degree and suitable for various foundation pit groove sizes and different geological conditions, and the novel steel sheet pile section steel supporting system has the advantages of being obvious economic benefit and social benefit and worthy of popularization and application.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (10)
1. The utility model provides a foundation ditch channel-section steel sheet pile shaped steel braced system which characterized in that: the support system comprises an enclosure structure (2) laid along the inner side wall of the foundation pit groove (1), an upper support structure (3) which stretches across two ends of the opening of the foundation pit groove (1) and is fixed on the side wall of the upper end of the enclosure structure (2), and a plurality of lower support structures (4) which are arranged below the opening and above the bottom of the foundation pit groove (1), wherein two ends of each lower support structure (4) are connected with the enclosure structures arranged on two sides in the foundation pit groove (1); the lower supporting structure (4) comprises a lower steel enclosing purlin (40) and a lower profile steel supporting beam (41), multiple layers of lower steel enclosing purlin (40) are arranged on the enclosure structure (2) respectively, the lower steel enclosing purlin (40) is connected to the surface of the enclosure structure (2) through bolts along the surrounding direction of the inner side wall of the foundation pit groove (1), multiple lower profile steel supporting beams (41) which are parallel to each other are arranged in the width direction of the foundation pit groove (1), and two ends of each lower profile steel supporting beam (41) are connected with the lower steel enclosing purlin (40) through bolts respectively.
2. The foundation pit channel steel sheet pile steel supporting system as claimed in claim 1, wherein: at least one drainage square culvert (5) is respectively arranged at two ends and two side walls of the bottom of the foundation pit (1), the enclosure structure (2) comprises a plurality of steel sheet piles (20) which are vertically fastened with each other and are laid on the inner side wall of the foundation pit groove (1), a plurality of layers of triangular brackets (21) are arranged on the steel sheet piles (20) along the vertical direction, the upper supporting structure (3) and the lower steel purlin (40) are respectively and horizontally arranged on each layer of triangular brackets (21) correspondingly, two ends of the lower steel supporting beam (41) are detachably connected with the lower steel purlin (40) through bolts, the lower steel purlin (40) at the bottom of the foundation pit groove (1) is arranged between the inner side wall of the foundation pit groove (1) and the outer wall of the drainage square culvert (5), upper steel movable winding heads (33) are arranged at the middle part and two ends of the upper steel winding purlin (30) and at one end part of the upper steel supporting beam (31), an upper jack (32) is arranged in the upper steel circulation head (33), and one end part of the upper steel supporting beam (31) is in transmission connection with the upper steel surrounding purlin (30) through an output shaft of the upper jack (32).
3. The foundation pit channel steel sheet pile steel supporting system as claimed in claim 2, wherein: go up bearing structure (3) and include that two parallels span last steel of foundation pit groove (1) oral area encloses purlin (30) and parallel connection in two and go up many upper steel supporting beam (31) between steel purlin (30), go up steel and enclose purlin (30) and set up on steel sheet pile 20 along the length direction of foundation pit groove (1) oral area, should go up steel and enclose purlin (30) and fix on the outer wall of steel sheet pile (20) through bolt and crossing triangular bracket (21).
4. The foundation pit channel steel sheet pile steel supporting system as claimed in claim 1 or 2, wherein: and pull piles (11) are arranged on the outer sides of the periphery of the opening part of the foundation pit groove (1), an iron chain or an iron pull rope (12) connected with the enclosure structure 2 is arranged on each pull pile (11), and a fence is arranged on each pull pile (10).
5. The foundation pit channel steel sheet pile steel supporting system as claimed in claim 2 or 3, wherein: the steel sheet pile (20) is provided with a groove body (200), the edge of the groove body (200) is provided with a buckling wing (201) which is bent outwards, the buckling wing (201) is arranged along the extending direction of the groove body (200) at the outer side of the edge of the steel sheet pile (20), and each steel sheet pile (2) is mutually spliced and buckled in series through the buckling wing (201).
6. The foundation pit channel steel sheet pile steel supporting system as claimed in claim 5, wherein: an H-shaped supporting steel pile (22) is arranged at the back of the groove body (200) of the adjacent steel sheet pile (20), the H-shaped supporting steel pile (22) extends to the bottom from the opening of the foundation pit groove (1), and the H-shaped supporting steel pile (22) is connected with the back of the groove body (200) through a bolt or a pin.
7. The foundation pit channel steel sheet pile steel supporting system as claimed in claim 6, wherein: the cross section of the trough body (200) is a triangular, circular arc, square or isosceles trapezoid cross section.
8. The foundation pit channel steel sheet pile steel supporting system as claimed in claim 2, wherein: the two ends of the lower steel supporting beam (41) are connected to the lower steel surrounding purlin (40) through lower steel moving heads (6) respectively, each layer of the middle and the two ends of the lower steel surrounding purlin (40) is provided with lower jacks (7) respectively at one end of the lower steel supporting beam (41), the lower jacks (7) are arranged in the lower steel moving heads (6), and one end of the lower steel supporting beam (41) is in transmission connection with output shafts of the lower jacks (7) between the lower steel surrounding purlin (40).
9. The foundation pit channel steel sheet pile steel supporting system as claimed in claim 8, wherein: and a reinforcing steel plate (8) is arranged on the outer side wall of the lower steel loose head (6), and the reinforcing steel plate (8) is sequentially connected to the ends of the lower steel loose head (6) and the lower profile steel supporting beam (41) through bolts.
10. A construction method of a foundation pit channel steel plate pile section steel supporting system is characterized by comprising the following steps: the method comprises the following steps:
step 1: the construction method comprises the steps of excavating a groove according to construction measurement positioning data to form a foundation pit groove (1), leveling a field according to the drawing size requirement of the foundation pit groove (1), splicing and installing the enclosure structure (2) by adopting steel sheet piles (20) in series, carrying out elevation lofting on the steel sheet piles (20) before installation, marking the steel sheet piles (20), an upper steel purlin (30) and a lower steel purlin (40), hoisting the steel sheet piles (20) into the foundation pit groove 1, inserting the steel sheet piles to form the enclosure structure (2), and enabling the pile tops of the steel sheet piles (20) to be higher than the horizontal ground of the opening of the foundation pit groove (1);
step 2: according to the marked position, a triangular bracket (21) is arranged on the outer wall of the steel sheet pile (20), and the upper steel purlins (30) are spliced on the ground, wherein equal-strength connection is required to be ensured; firstly, the spliced upper steel purlin is lifted and placedOn triangular bracket (21), and make and go up steel purlin (30) and steel sheet pile (20) in close contact with, guarantee that the both ends of going up steel purlin (30) span on supporting bench (10) at basic pit groove (1) both ends oral area edge, set up one upper steel supporting beam along upper steel purlin (30) every 3 meters ~ 4 meters, fix the one end of upper steel supporting beam (31) on upper steel purlin (30), the other end of upper steel supporting beam (31) is connected through upper steel swivel head (33) go up on steel purlin (30), so that the concatenation forms bearing structure (3) on basic pit groove (1), wherein, the steel shotcrete length of upper steel supporting beam (31) is 10 ~ 30cm less than the width of basic pit groove (1), the elevation both ends deviation of upper steel supporting beam (31) is not more than 20mm and L0/600，L0The length of the upper steel support beam;
and step 3: an upper jack (32) is arranged in the upper steel circulation head (33), the upper jack (32) is started to enable an upper steel supporting beam (31) to be stable and tightly press upper steel surrounding purlins (30) connected to two sides of the foundation pit groove (1), the upper steel surrounding purlins (30) are tightly pressed on the upper end of the steel sheet pile (20), and the side wall of the upper end of the foundation pit groove (1) is supported and protected;
and 4, step 4: when a certain depth is excavated, a first lower supporting structure (4) is formed by installing and splicing the bottom of a newly excavated foundation pit according to the steps 2 to 3, namely, the spliced lower steel purlin (40) is lifted and placed on a triangular bracket (21), the lower steel purlin (40) is in close contact with a steel sheet pile (20), two ends of the lower steel purlin (40) are supported on supporting tables (10) which are arranged at two ends of the opening part of the foundation pit groove (1) in a crossing manner, one lower steel supporting beam (41) is arranged on the lower steel purlin (40) at intervals of 3-4 meters, one end of the lower steel supporting beam (41) is fixed on the lower steel purlin (40), the other end of the lower steel supporting beam (41) is connected to the lower steel purlin (40) through a lower steel loose joint (6) so as to be spliced to form the first lower supporting structure (4), wherein the steel supporting length of the lower steel supporting beam (41) is 10-30 cm shorter than the width of the foundation pit groove, the elevation deviation of two ends of the section steel supporting beam is not more than 20mm and L1/600，L1The length of the lower profile steel support beam;
and 5: installing a lower jack (7) in a sliding groove of the lower steel loose joint (6), starting the lower jack (7) to eject a lower section steel supporting beam (41) to apply prestress to the lower steel purlin (40), then ejecting a steel wedge into the sliding groove of the lower steel loose joint (6) and knocking tightly, wherein the length of the steel wedge extending into the lower steel loose joint (6) is not less than 20cm, so that a lower supporting structure (4) is installed on each layer of triangular bracket (21), and downward excavation is continued on the first lower supporting structure (4); when the excavation depth is reached, installing and splicing a second lower supporting structure (4) at the bottom of a newly excavated foundation pit groove (1) according to the steps 2 to 3, then continuing foundation pit earthwork excavation, and repeating the construction until the elevation of the bottom of the foundation pit groove reaches the design requirement, wherein lower jacks (7) are symmetrically and equidistantly arranged on two sides of the supporting axis of a lower steel piston head (6) and synchronously apply pressure; the prestress is required to be the design value, and after the pressure is stable, the connection is reinforced again through a reinforced steel plate (8); after the prestress is applied, the length of the head and neck of the lower steel loose head (6) extending out of the lower steel support beam (41) is not more than 30cm, otherwise, channel steel is welded at two ends of the lower loose head to fix the lower loose head after the prestress is applied; after the prestress is applied, a gap between the end part of the lower profile steel support beam (41) and the lower steel purlin (40) is tightly cushioned by a steel plate; when the soil quality is poor or the excavation depth of a foundation pit groove is deep, in order to strengthen the lateral pressure of the steel sheet pile against the foundation soil, an H-shaped supporting steel pile (22) is inserted into the back of the steel sheet pile (20).
Step 6: after the foundation pit groove earthwork is excavated to a construction elevation, a concrete cushion layer at the bottom of the foundation pit groove (1) is constructed, then a drainage square culvert (5) in the foundation pit groove is constructed, and when the drainage square culvert (5) collides with a lower section steel support beam (41) to influence the construction, a lower support structure (4) can be detached after a bottom plate support changing force transmission belt reaches 70% of the design strength; removing the lower supporting structures (4) from bottom to top, then backfilling earthwork to each lower supporting structure (4), removing the rest lower supporting steel enclosing purlin (40) and the lower profile steel supporting beams (41), removing the upper supporting structure (3) after backfilling the earthwork is finished, and pulling out the steel sheet piles (20) and the H-shaped supporting steel piles (22), wherein the length of each steel sheet pile (20) is not more than 6m, and the height between each layer of lower supporting structures (4) is 5m-6 m; when the steel piston is dismantled, a load is gradually unloaded from the lower section steel supporting beam (41) by using a 100-ton jack, the iron plug is knocked, the wedge block is loosened, the wedge block is taken out, then the lower jack (32) in the steel piston head and the 100-ton jack are sequentially decompressed and are completely loosened, the 100-ton jack is moved away, and finally the lower section steel supporting beam (41) is controlled to be hoisted out of the foundation pit groove (1).
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