CN111779000A - Quick-to-disassemble and assemble foundation pit supporting structure and construction method - Google Patents
Quick-to-disassemble and assemble foundation pit supporting structure and construction method Download PDFInfo
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- CN111779000A CN111779000A CN202010748801.1A CN202010748801A CN111779000A CN 111779000 A CN111779000 A CN 111779000A CN 202010748801 A CN202010748801 A CN 202010748801A CN 111779000 A CN111779000 A CN 111779000A
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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
- 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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- 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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Abstract
The invention discloses a foundation pit supporting structure capable of being rapidly disassembled and assembled and a construction method. The utility model provides a quick assembly disassembly's foundation ditch supporting construction, it includes the larsen steel sheet pile, exempt from to weld quick assembly disassembly formula bracket, the steel shotcrete with adjustable length, the steel purlin, the protection falling device, the larsen steel sheet pile sets up perpendicularly in the both sides of foundation ditch, the larsen steel sheet pile top of foundation ditch both sides interval respectively is provided with the welding-free quick assembly disassembly formula bracket of a plurality of, the welding-free quick assembly disassembly formula bracket is hung at the top of larsen steel sheet pile, the steel purlin sets up on the welding-free quick assembly disassembly formula bracket of foundation ditch both sides, it is provided with the steel shotcrete with adjustable a plurality of length to have the interval between the steel purlin of foundation ditch both sides, the both ends of the steel shotcrete with adjustable length respectively with the steel purlin top of foundation ditch both sides tight, steel shotcrete with adjustable length and steel purlin all are connected through. The invention can be quickly assembled and disassembled, and can adjust the pressure born by the steel support at any time according to the working condition, thereby ensuring the safety and stability of the support system.
Description
Technical Field
The invention relates to a foundation pit supporting structure, and belongs to the technical field of building construction. The invention also relates to a construction method of the quick-disassembly foundation pit supporting structure.
Background
In municipal administration rain sewage pipeline laying construction, the rain sewage pipe buries the general 3 ~ 6m of depth, belongs to deep basal pit excavation construction. Because the construction site is narrower and small, the foundation pit can not be excavated by adopting slope-putting, and the foundation pit is usually excavated by adopting a vertical supporting system of Larsen steel sheet piles matched with internal supports of the enclosing purlin. The support system consists of Larsen steel sheet piles, brackets, steel purlins and steel supports. The Larsen steel sheet piles are mutually occluded and inserted into soil bodies to form a closed soil retaining and water stopping structure, and the steel purlins and the steel supports jointly form an inner support system in a plane to resist deformation pressure of the soil bodies on two sides into the foundation pit. The steel purlin is placed on the bracket to play a role in transverse connection, so that each steel sheet pile forms an integral uniform stress system. The steel support bears axial pressure and is the main load-bearing component.
At present, in the excavation and support construction of a deep foundation pit of a rainwater and sewage pipeline, because the depth and the span of the foundation pit are not large, a simple support form is often adopted, namely common H-shaped steel is adopted as a steel enclosing purlin and a steel support. The steel purlin and the steel support are usually made of 250-300 mm, 300-300 mm or 350-350 mm H-shaped steel, and the specifications of the steel are different according to the depth of the foundation pit, but the specifications can meet the requirement of deformation resistance of the foundation pit.
Because the pipe diameter of the rainwater and sewage pipeline has multiple specifications, the width of a foundation pit changes along with the pipe diameter, so that the length of the steel support needs to be adjusted according to different widths of the foundation pit, the length of the H-shaped steel adopted by the existing steel support is often not adjustable, and the H-shaped steel needs to be cut or welded and lengthened on a construction site at each time in order to meet the requirements of the foundation pits with different widths. The electric welding and the oxyacetylene cutting are in cross operation, time and labor are consumed, materials are wasted, and potential safety hazards are large. And the inevitable existence of installation error of steel construction leads to the pressure that each steel shotcrete bore to be different for interior support system has lost the wholeness. In addition, because the excavation of the foundation pit has a space-time effect, a supporting system needs to be quickly formed. At present, brackets are welded on Larsen steel sheet piles by adopting a welding method, the cross section of each bracket is mostly H-shaped or T-shaped, according to the cross section and the size of each bracket, the welding time of a single bracket is generally not less than 20 minutes, the welding time is long, the labor intensity of workers is high, the welding quality is unstable, the cross operation of electric welding and oxygen acetylene is unsafe, the steel sheet piles are damaged by welding, and the material reuse rate is low.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an inner supporting and protecting structure system of a foundation pit, which can be quickly assembled and disassembled and can adjust the pressure borne by a steel support at any time according to the working condition
The invention is realized by the following technical scheme: the utility model provides a quick assembly disassembly's underground structure, characterized by: the welding-free quick assembly disassembly type bracket comprises a hoisting part, a hanging plate and a supporting plate, wherein the hoisting part is provided with a hoisting hole, the top end of the hanging plate bends backwards to form a hook part with a downward opening, the hoisting part is fixedly connected to the top end of the hanging plate, the supporting plate is horizontally arranged at the lower end part of the front side of the hanging plate, one end of the supporting plate is vertically and fixedly connected with the front side surface of the hanging plate, two rib plates arranged at intervals are arranged at the lower part of the supporting plate, the rib plates are vertically and fixedly connected with the lower part of the supporting plate and the front side surface of the hanging plate, the length-adjustable steel support comprises a compression bar and a length adjusting structure, one end of the compression bar is fixedly connected with a pressure plate I, and the other end of the compression bar is fixedly connected with a flange plate I, the flange plate I is provided with a plurality of round holes, the length adjusting structure comprises a pressing plate II and a plurality of screw rods, one end of each screw rod is fixedly connected to the pressing plate II, the screw rods are arranged on the pressing plate II and correspond to the round holes in the flange plate I, the other end of each screw rod penetrates through the round holes in the flange plate I and is connected with the flange plate I through threaded sleeves, the falling protection device is a steel wire rope, the Larsen steel sheet piles are vertically arranged on two sides of a foundation pit, a plurality of welding-free quick assembly disassembly type brackets are respectively arranged at intervals at the tops of the Larsen steel sheet piles on the two sides of the foundation pit, the welding-free quick assembly disassembly type brackets are hung at the tops of the Larsen steel sheet piles through the hanging plates, the steel purlins are arranged on the welding-free quick assembly type brackets on the two sides of the foundation pit, a plurality of length-adjustable steel supports are arranged, the pressing plate I and the pressing plate II of the length-adjustable steel support are respectively tightly propped against the steel purlins on the two sides of the foundation pit, and the length-adjustable steel support and the steel purlins are connected with the tops of the Larsen steel sheet piles through the protective falling devices.
According to the invention, the bracket adopts a welding-free quick dismounting structure, the bracket can be directly hung on the top of the Larsen steel sheet pile through the bent hook part on the hanging plate, the mounting and dismounting speed is high, the labor intensity is low, and the bracket can be recycled. The steel shotcrete adopts the adjustable steel shotcrete of length, adjusts the length of being connected between screw rod and the ring flange through the threaded sleeve of adjusting length adjustment structure part to adjust the length of steel shotcrete to suitable length, then fasten every threaded sleeve, reach suitable axial force. In the construction, the length of the steel support can be adjusted according to the width of a foundation pit, and the length of the steel support can also be adjusted at any time according to the change of the stratum soil pressure, so that the stress of each steel support is uniform, the safety and the stability of a supporting system can be kept all the time, the excessive deformation of the periphery of a groove is prevented, and the adjustment is convenient and quick.
Furthermore, a hanging ring is arranged on the pressure rod, one end of the falling protection device is connected with the hanging ring, and the other end of the falling protection device is connected with the top of the Larsen steel sheet pile. The steel support can be conveniently hoisted and the falling protection device can be conveniently installed by arranging the hanging ring.
Further, in order to enable the steel support to be suitable for grooves with more widths, the compression rod comprises a standard section and an elongated section, one end of the elongated section is detachably and coaxially connected with one end of the standard section, the compression plate I is fixedly connected to the other end of the standard section, and the flange plate I is fixedly connected to the other end of the elongated section. During construction, the standard segment and the lengthened segment can be matched in advance according to the width of the groove. The compression bar adopts standard segment and extension segment, can dispose in a flexible way as required, can reduce the configuration quantity of compression bar, reduces construction cost.
Furthermore, in order to facilitate quick connection and disassembly, the standard section and the connected end of the extension section are provided with a flange II, and the standard section and the extension section are connected together through the flange II.
Furthermore, in order to reduce the weight and ensure the bearing capacity of the pressure lever, the pressure lever is of a steel pipe structure.
Further, for the intensity of guaranteeing the steel shotcrete, the round hole on the ring flange I is 6, the screw rod is 6.
Furthermore, in order to be matched with the Larsen steel sheet pile, the width of the hanging plate is 20cm, and the length of the hanging plate is 80 cm.
The invention also provides a construction method of the foundation pit supporting structure capable of being quickly disassembled and assembled, which is characterized by comprising the following steps: the method comprises the following steps:
(1) measuring and lofting after reserving the width of a working face according to the design line of the rain and sewage pipeline and the diameter of the pipeline;
(2) inserting and driving the Larsen steel sheet pile to a preset depth according to the measurement lofting position, engaging and inserting and driving the Larsen steel sheet pile in the positive and negative directions to ensure the water stopping effect, and then excavating the foundation pit to a designed depth;
(3) selecting proper Larsen steel sheet piles according to the arrangement intervals of the brackets, adopting hoisting equipment to hook the welding-free quick assembly disassembly type brackets on the tops of the selected Larsen steel sheet piles one by one, and additionally arranging rubber cushion blocks between the welding-free quick assembly disassembly type brackets and the Larsen steel sheet piles to ensure that the Larsen steel sheet piles and the brackets are in full contact;
(4) placing steel purlins on welding-free quick assembly disassembly type brackets by using hoisting equipment, wherein each steel purlin is connected to the top of a Larsen steel sheet pile by using two steel wire ropes;
(5) the length-adjustable steel supports are arranged between the steel enclosing purlins on the two sides of the foundation pit according to the horizontal distance of every 4-5 m, the protective falling device is hung after the length-adjustable steel supports are hoisted in place by adopting hoisting equipment, the length of the length-adjustable steel supports is further finely adjusted, and pretightening force is applied to enable the steel supports to tightly prop against the steel enclosing purlins.
Furthermore, the length of each steel enclosing purlin is 8-12 m, and 3-4 welding-free quick assembly disassembly type brackets are adopted for supporting.
Furthermore, a torque wrench is used for screwing the threaded sleeve, so that the stress of each length-adjustable steel support is uniform; the jacking force between the length-adjustable steel support and the steel enclosing purlin is adjusted at any time according to the change condition of the stratum soil pressure, and the safety and the stability of a supporting system are kept all the time.
The invention has the beneficial effects that: (1) compared with the welding bracket which is usually adopted at present, the welding-free quick-disassembly-and-assembly bracket is of an integral structure, the bracket is directly hung on the top of the Larsen steel sheet pile, the installation and disassembly speed is high, and the labor intensity is low; the welding-free quick-dismounting bracket has no damage to the steel sheet pile during mounting and dismounting, and the bracket can be recycled.
(2) The steel support adopts the design of adjustable length, the length of the steel support can be adjusted according to the width of the foundation pit, temporary cutting or welding lengthening is not needed on a construction site, workers adjust the reasonable length of the steel support to the side of the foundation pit in advance, the steel support is hoisted to a preset position and then finely adjusted in place, and the installation speed is obviously improved; the length of the steel support is adjusted by the flange plate bolt extension and the screw rod, so that a worker can easily complete the disassembly and assembly of the steel support only by using a torque wrench in cooperation with a crane to screw the threaded sleeve on the screw rod. The installation and the demolition of the whole enclosing purlin and the supporting system do not need welding and gas cutting operation, and the potential safety hazard is small.
(3) According to the invention, the length of the screw rod of the steel support is adjusted, and pressure can be actively applied to the steel purlin. The torque wrench is used for screwing the threaded sleeve, so that the stress of each steel support is more uniform, and the integrity of a support system is good. The tightness of the steel support can be adjusted at any time along with the change of the stratum soil pressure, the safety and the stability of a supporting system are always kept, and the excessive deformation of the periphery of the foundation pit is prevented.
(4) Compared with the prestressed steel support of a large foundation pit, the steel support structure is simpler and more reliable, is simpler and more convenient to operate and has strong flexibility. Compared with a simple supporting system, the structure of the invention has more integrity and safe reliability. The quick dismounting support structure is suitable for foundation pits with the depth not more than 6m and the width not more than 4 m.
Drawings
FIG. 1 is a schematic plan view of the present invention in an embodiment;
FIG. 2 is a schematic cross-sectional view of the present invention in an embodiment;
FIG. 3 is a schematic structural view of a welding-free quick release bracket according to the present invention;
FIG. 4 is a schematic sectional view A-A of FIG. 3;
FIG. 5 is a schematic structural view of a length adjustable steel support according to the present invention;
FIG. 6 is a schematic cross-sectional view of the flange I of FIG. 5;
FIG. 7 is another schematic view of the length adjustable steel support of the present invention;
in the drawing, 1, Larsen steel sheet piles, 2, steel purlins, 3, length-adjustable steel supports, 3-1, pressure rods, 3-101, standard sections, 3-102, extension sections, 3-2, pressure plates I, 3-3, flange plates I, 3-4, screws, 3-5, hanging rings, 3-6, pressure plates II, 3-7, threaded sleeves, 3-8, stiffening ribs, 3-9, round holes, 3-10, flange plates II, 4, welding-free quick assembly disassembly type brackets, 4-1, hoisting components, 4-101, hoisting holes, 4-2, hanging plates, 4-201, bent hook portions, 4-3, supporting plates, 4-4, rib plates, 5, protective devices, 6 and pipelines are arranged.
Detailed Description
The invention will now be further illustrated by way of non-limiting examples in conjunction with the accompanying drawings:
as shown in the attached drawing, the quick-dismounting foundation pit supporting structure comprises a Larsen steel sheet pile 1, a welding-free quick-dismounting bracket 4, a length-adjustable steel support 3, a steel purlin 2 and a protective falling device 5.
The welding-free quickly-disassembled bracket 4 comprises a hoisting part 4-1, a hanging plate 4-2 and a supporting plate 4-3, wherein the hoisting part 4-1 is of a steel block structure, a hoisting hole 4-101 is formed in the hoisting part 4-1, and the hoisting hole 4-101 is mainly used for hoisting, moving and hanging the bracket. The hanging plate 4-2 is made of a Q235 steel plate with the thickness of 2cm, the hanging plate 4-2 is of a rectangular plate structure, and the top end of the hanging plate 4-2 is bent towards the rear side to form a bent hook part 4-201 with a downward opening. The length of the hanging plate 4-2 is preferably 80cm, the width of the hanging plate 4-2 is slightly smaller than the width of a web plate of the Larsen steel sheet pile 1, and the preferred width is 20 cm. The hanging plate 4-2 is mainly used for being hung at the top of the Larsen steel sheet pile 1 and connecting the hoisting part 4-1 with the supporting plate 4-3, and is in a vertical state during operation and tightly attached to a web plate of the Larsen steel sheet pile 1. The hoisting part 4-1 is fixedly connected to the middle of the top end of the hanging plate 4-2. The supporting plate 4-3 is made of a Q235 steel plate with the thickness of 2cm and is of a flat plate structure. The supporting plate 4-3 is horizontally arranged at the lower end part of the front side of the hanging plate 4-2, one end of the supporting plate is vertically and fixedly connected with the front side surface of the hanging plate 4-2, and the supporting plate 4-3 is connected with the hanging plate 4-2 by adopting a fillet weld. The main function of the supporting plate 4-3 is to bear the steel purlin 2. Two ribbed plates 4-4 arranged at intervals are arranged at the lower part of the supporting plate 4-3, and the ribbed plates 4-4 are vertically and fixedly connected with the lower part of the supporting plate 4-3 and the front side surface of the hanging plate 4-2. The ribs 4-4 are connected with the supporting plate 4-3 and the hanging plate 4-2 by double-sided welding. The main function of the rib 4-4 is to provide sufficient load bearing capacity for the pallet 4-3. The rib 4-4 is preferably made of a Q235 steel plate having a thickness of 2 cm.
The length-adjustable steel support 3 comprises a compression bar 3-1 and a length adjusting structure. One end of the pressure rod 3-1 is fixedly connected with a pressure plate I3-2, the other end of the pressure rod 3-1 is fixedly connected with a flange plate I3-3, and a plurality of round holes 3-9 are formed in the flange plate I3-3. The length adjusting structure comprises a pressing plate II 3-6 and a plurality of screw rods 3-4, one ends of the screw rods 3-4 are fixedly connected to the pressing plate II 3-6, and the screw rods 3-4 are arranged on the pressing plate II 3-6 and correspond to the round holes 3-9 in the flange plate I3-3. The other ends of all the screw rods 3-4 of the length adjusting structure correspondingly penetrate through round holes 3-9 in the flange plates I3-3, are connected with the flange plates I3-3 through matched gaskets and threaded sleeves 3-7, and the connecting lengths of the screw rods can be adjusted by adjusting the threaded sleeves 3-7. The compression bar 3-1 is a main stress component and mainly used for bearing the deformation pressure of soil bodies on two sides of the foundation pit. As the pressure lever 3-1 bears larger axial pressure, a steel pipe with DN273mm and 8-10 mm of wall thickness can be selected to meet the use requirement according to the geological condition and the bearing capacity of the pressure lever 3-1. The pressure plate I3-2 and the pressure plate II 3-6 are processed by steel plates with the thickness of 25mm, the pressure plate I3-2 and the pressure rod 3-1 and the pressure plate II 3-6 and the screw rod 3-4 are connected in a welding mode, and the pressure plate I3-2 and the pressure plate II 3-6 directly bear the load. The flange plate I3-3 is formed by processing a steel plate with the thickness of 25mm, the flange plate I is welded perpendicular to the end part of the compression bar 3-1, the strength of the flange plate is improved, and 6 stiffening ribs 3-8 are vertically welded between the flange plate I3-3 and the compression bar 3-1 in the embodiment. In the embodiment, 6 circular holes 3-9 with the aperture of 33mm are uniformly formed in the periphery of the flange plate I3-3. The spiral 3-4 is made of 32mm phi finish-rolled deformed steel bar. In order to prevent the instability caused by the overlarge slenderness ratio of the screw rod, the length of a single screw rod is preferably 400mm, and the adjusting stroke is 200 mm. In order to facilitate hoisting and prevent falling after installation, the pressure lever 3-1 is provided with hanging rings 3-5, the hanging rings 3-5 are arranged at proper positions of the pressure lever 3-1, and the number of the hanging rings is set according to requirements.
As shown in FIG. 7, in order to deal with the grooves with different widths, the pressure rod 1 of the invention is provided with a standard section 3-101 and an elongated section 3-102, one end of the elongated section 3-102 is detachably and coaxially connected with one end of the standard section 3-101, the pressure plate I3-2 is fixedly connected with the other end of the standard section 3-101, and the flange plate I3-3 is fixedly connected with the other end of the elongated section 3-102. Preferably, the connecting ends of the standard sections 3-101 and the elongated sections 3-102 are provided with flanges II 3-10, and the standard sections and the elongated sections are connected together through the flanges II 3-10. The standard sections 3-101 and the flange plates II 3-10 thereof, and the extension sections 3-102 and the flange plates II thereof are connected by welding. The common width of the rain sewage pipeline groove is 1.6-3.2 m, and after the width occupied by the steel enclosing purlin is deducted, the required width of the steel support is 0.8-2.4 m. Thus, standard segments of 0.6m and 1.2m and elongated segments of 0.3m and 0.6m can be processed. And pre-assembling a rod piece combination of the steel support according to the width of the groove. When the combined pressure lever is adopted, the hanging ring 5 is arranged according to actual needs.
The function of the falling protection device 5 is to prevent the steel purlin and the steel support from falling. The fall protection 5 is preferably a steel cable.
The Larsen steel sheet piles 1 are vertically arranged on two sides of a foundation pit, a plurality of welding-free quick assembly disassembly type brackets 4 are arranged at the tops of the Larsen steel sheet piles 1 on the two sides of the foundation pit at intervals respectively, and the welding-free quick assembly disassembly type brackets 4 are hung on the top of the Larsen steel sheet piles 1 through the hanging plates 4-2. The steel purlin 2 is arranged on the supporting plates 4-3 of the welding-free quick assembly disassembly type bracket 4 on two sides of the foundation pit. And a plurality of length-adjustable steel supports 3 are arranged between the steel purlins 2 on the two sides of the foundation pit at intervals, and a pressing plate I3-2 and a pressing plate II 3-6 of each length-adjustable steel support 3 are respectively tightly propped against the steel purlins 2 on the two sides of the foundation pit. The length-adjustable steel support 3 and the steel purlin 2 are connected with the top of the Larsen steel sheet pile 1 in a hooking mode through the protective falling device 5. The protective falling device 5 is connected with the length-adjustable steel support 3, one end of the protective falling device 5 is connected with a hanging ring 3-5 on the length-adjustable steel support 3, and the other end of the protective falling device is connected with the top of the Larsen steel sheet pile 1 in a hanging mode.
The construction method of the foundation pit supporting structure capable of being quickly disassembled and assembled comprises the following steps:
(1) and measuring and lofting after reserving the width of the working face according to the design line of the rain and sewage pipeline and the diameter of the pipeline.
(2) Inserting and driving the Larsen steel plate pile 1 to a preset depth according to the measurement lofting position, inserting and driving the Larsen steel plate pile 1 in a positive and negative occlusion mode, ensuring the water stopping effect, and then excavating the foundation pit to the designed depth.
(3) Selecting proper Larsen steel sheet piles according to the arrangement intervals of the brackets, adopting hoisting equipment to hook the welding-free quick assembly disassembly type brackets 4 on the tops of the selected Larsen steel sheet piles one by one, and additionally arranging rubber cushion blocks between the welding-free quick assembly disassembly type brackets 4 and the Larsen steel sheet piles to ensure that the Larsen steel sheet piles and the brackets are in full contact. The rubber cushion blocks are additionally arranged between the brackets and the steel sheet piles, so that the steel sheet piles and the brackets can be fully contacted, and the effects of stress dispersion and skid resistance are achieved.
(4) And the steel purlins 2 are placed on the welding-free quick assembly disassembly type bracket 4 by adopting hoisting equipment, and each steel purlin 3 is connected to the top of the Larsen steel sheet pile 1 by adopting two steel wire ropes. In order to ensure safety, the length of the single steel purlin is preferably 8-12 m, and 3-4 welding-free quick assembly disassembly type brackets 4 are adopted for supporting.
(5) The length-adjustable steel supports 3 are arranged between the steel enclosing purlins 2 on two sides of the foundation pit according to the horizontal distance of every 4-5 m, the length of the length-adjustable steel supports 3 is preliminarily adjusted according to the width of the foundation pit, the length-adjustable steel supports 3 are hoisted in place by adopting hoisting equipment, then steel wire ropes for preventing falling are hung, the length of the length-adjustable steel supports 3 is further finely adjusted, and pretightening force is applied to enable the steel supports to tightly prop against the steel enclosing purlins 2.
The length of the screw rod of the steel support is adjusted, so that pressure can be actively applied to the steel purlin. When the length-adjustable steel supports 3 are adjusted, the torque wrench is used for screwing the threaded sleeves 3-7, so that the stress of each length-adjustable steel support 3 is uniform, and the integrity of a support system is good. The jacking force between the length-adjustable steel support 3 and the steel purlin 2 can be adjusted at any time according to the change of the stratum soil pressure, the safety and the stability of a supporting system are kept all the time, and the excessive deformation of the periphery of the foundation pit is prevented.
Other parts in this embodiment are the prior art, and are not described herein again.
Claims (10)
1. The utility model provides a quick assembly disassembly's underground structure, characterized by: the steel plate pile protection device comprises a Larsen steel plate pile (1), a welding-free quick assembly disassembly bracket (4), a length-adjustable steel support (3), a steel purlin (2) and a protection falling device (5), wherein the welding-free quick assembly disassembly bracket (4) comprises a hoisting part (4-1), a hanging plate (4-2) and a supporting plate (4-3), the hoisting part (4-1) is provided with a hoisting hole (4-101), the top end of the hanging plate (4-2) is bent backwards to form a bent hook part (4-201) with a downward opening, the hoisting part (4-1) is fixedly connected with the top end of the hanging plate (4-2), the supporting plate (4-3) is horizontally arranged at the lower end part of the front side of the hanging plate (4-2) and one end of the supporting plate is vertically and fixedly connected with the front side face of the hanging plate (4-2), the lower part of the supporting plate (4-3) is provided with two rib plates (4-4) which are arranged at intervals, the rib plates (4-4) are vertically and fixedly connected with the lower part of the supporting plate (4-3) and the front side surface of the hanging plate (4-2), the length-adjustable steel support (3) comprises a pressing rod (3-1) and a length adjusting structure, one end of the pressing rod (3-1) is fixedly connected with a pressing plate I (3-2), the other end of the pressing rod (3-1) is fixedly connected with a flange plate I (3-3), the flange plate I (3-3) is provided with a plurality of round holes, the length adjusting structure comprises a pressing plate II (3-6) and a plurality of screw rods (3-4), one ends of the screw rods (3-4) are fixedly connected onto the pressing plate II (3-6), screw rod (3-4) are in on clamp plate II (3-6) with round hole on the ring flange I (3-3) corresponds the arrangement, the other end of screw rod (3-4) passes round hole on the ring flange I (3-3) pass through the screw sleeve with ring flange I (3-3) are connected, protection falling device (5) are wire rope, the larsen steel sheet pile sets up perpendicularly in the both sides of foundation ditch, be provided with a plurality of at the larsen steel sheet pile top of foundation ditch both sides respectively interval exempt from to weld quick assembly disassembly formula bracket (4), exempt from to weld quick assembly disassembly formula bracket (4) and pass through link plate (4-2) hang the top at the larsen steel sheet pile, steel purlin (2) set up in the foundation ditch both sides weld quick assembly formula bracket (4) on, be provided with a plurality of at an interval between steel purlin (2) in the foundation ditch both sides steel support (3) with adjustable length ) The pressing plates I (3-2) and II (3-6) of the length-adjustable steel supports (3) are tightly propped against the steel enclosing purlins (2) on the two sides of the foundation pit respectively, and the length-adjustable steel supports (3) and the steel enclosing purlins (2) are connected with the tops of the Larsen steel sheet piles through the protective falling devices (5).
2. The quick release pit supporting structure of claim 1, wherein: the pressure lever (3-1) is provided with a hanging ring (3-5), one end of the falling protection device (5) is connected with the hanging ring (3-5), and the other end of the falling protection device is connected with the top of the Larsen steel sheet pile.
3. The quick release pit supporting structure of claim 1, wherein: the compression bar (3-1) comprises a standard section and an elongated section, one end of the elongated section is detachably and coaxially connected with one end of the standard section, the pressing plate I (3-2) is fixedly connected with the other end of the standard section, and the flange plate I (3-3) is fixedly connected with the other end of the elongated section.
4. The quick release pit supporting structure of claim 3, wherein: and one ends of the standard section and the extension section, which are connected, are provided with flange plates II, and the standard section and the extension section are connected together through the flange plates II.
5. The quick release pit supporting structure of claim 1, wherein: the compression bar (3-1) is of a steel pipe structure.
6. The quick release pit supporting structure of claim 1, wherein: the number of the round holes in the flange plate I (3-3) is 6, and the number of the screw rods (3-4) is 6.
7. A quick-release underground structure as claimed in claim 1 or claim 2 or claim 3 or claim 4 or claim 5 or claim 6 wherein: the width of the hanging plate (4-2) is 20cm, and the length of the hanging plate is 80 cm.
8. A method of constructing a quick-release pit supporting structure as claimed in any one of claims 1 to 7, wherein: the method comprises the following steps:
(1) measuring and lofting after reserving the width of a working face according to the design line of the rain and sewage pipeline and the diameter of the pipeline;
(2) inserting and driving the Larsen steel sheet pile to a preset depth according to the measurement lofting position, engaging and inserting and driving the Larsen steel sheet pile in the positive and negative directions to ensure the water stopping effect, and then excavating the foundation pit to a designed depth;
(3) selecting proper Larsen steel sheet piles according to the arrangement intervals of the brackets, adopting hoisting equipment to hook the welding-free quick assembly disassembly type brackets on the tops of the selected Larsen steel sheet piles one by one, and additionally arranging rubber cushion blocks between the welding-free quick assembly disassembly type brackets and the Larsen steel sheet piles to ensure that the Larsen steel sheet piles and the brackets are in full contact;
(4) placing steel purlins on welding-free quick assembly disassembly type brackets by using hoisting equipment, wherein each steel purlin is connected to the top of a Larsen steel sheet pile by using two steel wire ropes;
(5) the length-adjustable steel supports are arranged between the steel enclosing purlins on the two sides of the foundation pit according to the horizontal distance of every 4-5 m, the protective falling device is hung after the length-adjustable steel supports are hoisted in place by adopting hoisting equipment, the length of the length-adjustable steel supports is further finely adjusted, and pretightening force is applied to enable the steel supports to tightly prop against the steel enclosing purlins.
9. The construction method according to claim 8, wherein: the length of each steel enclosing purlin is 8-12 m, and 3-4 welding-free quick assembly disassembly type brackets are adopted for supporting.
10. The construction method according to claim 8 or 9, wherein: a torque wrench is used for screwing the threaded sleeve, so that the steel supports with adjustable lengths are stressed uniformly; the jacking force between the length-adjustable steel support and the steel enclosing purlin is adjusted at any time according to the change condition of the stratum soil pressure, and the safety and the stability of a supporting system are kept all the time.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010748801.1A CN111779000A (en) | 2020-07-30 | 2020-07-30 | Quick-to-disassemble and assemble foundation pit supporting structure and construction method |
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| CN202010748801.1A CN111779000A (en) | 2020-07-30 | 2020-07-30 | Quick-to-disassemble and assemble foundation pit supporting structure and construction method |
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| CN202010748801.1A Pending CN111779000A (en) | 2020-07-30 | 2020-07-30 | Quick-to-disassemble and assemble foundation pit supporting structure and construction method |
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| CN115387359A (en) * | 2022-09-22 | 2022-11-25 | 中国建筑第七工程局有限公司 | Rain sewage slot support |
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