CN118187078A - Supporting system for deep foundation pit reverse construction method working well main body - Google Patents
Supporting system for deep foundation pit reverse construction method working well main body Download PDFInfo
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- CN118187078A CN118187078A CN202311475813.1A CN202311475813A CN118187078A CN 118187078 A CN118187078 A CN 118187078A CN 202311475813 A CN202311475813 A CN 202311475813A CN 118187078 A CN118187078 A CN 118187078A
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- 230000008093 supporting effect Effects 0.000 title claims abstract description 60
- 238000010276 construction Methods 0.000 title claims abstract description 53
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims description 61
- 239000010959 steel Substances 0.000 claims description 58
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 239000002023 wood Substances 0.000 claims description 14
- 238000009412 basement excavation Methods 0.000 claims description 12
- 238000005491 wire drawing Methods 0.000 claims description 11
- 239000002689 soil Substances 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 3
- 238000004064 recycling Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011120 plywood Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000002633 protecting effect Effects 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
The invention provides a support system for a deep foundation pit reverse construction method working well main body, and relates to the technical field of deep foundation pit working well construction, comprising a crown beam template, a plurality of layers of ring beam templates and a plurality of layers of side wall support structures; the crown beam template and the ring beam template comprise side dies, wherein a main stupefied layer and a secondary stupefied layer are sequentially laid on the outer sides of the side dies, and the crown beam template and the ring beam template further comprise a plurality of opposite-pulling screw rods; the side wall support structure comprises a side wall template and side wall brackets, wherein the side wall template is formed by assembling and fixing a plurality of side wall sub-templates, the side wall brackets are fixedly connected with the side wall template, the side wall brackets are formed by assembling a plurality of support brackets, and each support bracket comprises an inner rod, a main beam and a reinforcing structure for fixedly supporting the inner rod and the main beam; the side wall supporting structure further comprises an operation platform, the operation platform is fixed on the ring beam through an operation support, the side wall supporting structure is fixed on the operation platform, the supporting system is stable, recycling is convenient, and construction efficiency is improved on the premise that the safety of the structure is guaranteed.
Description
Technical Field
The invention belongs to the technical field of deep foundation pit working well construction, and particularly relates to a supporting system for a deep foundation pit reverse construction method working well main body.
Background
The deep foundation pit support is a measure for supporting, reinforcing and protecting the side wall of the deep foundation pit and the surrounding environment in order to ensure the safety of the underground structure construction and the surrounding environment of the foundation pit; when the construction site does not have a slope releasing condition, the slope releasing can not ensure the construction safety or the construction requirement can not be met through slope releasing and temporary support additionally arranged, a supporting structure is generally adopted for temporary supporting so as to ensure the soil wall stability of the foundation pit, so that the supporting system plays an important role in maintaining the stability and the side wall construction quality for the working well constructed by the deep foundation pit reverse construction method.
The deep foundation pit excavation of the underground engineering widely applied at present is mostly forward, layer-by-layer excavation and layer-by-layer support, and is generally applicable to shallow foundation pit excavation. The reverse construction is the most economical and reliable method for developing underground space, and because some small technical problems of the reverse construction are not solved, the advantages of the reverse construction are not obvious, so that aiming at the reverse construction, how to provide a supporting structure for the reverse construction of the underground space with safety, high efficiency and low cost is a technical problem which needs to be solved by the person skilled in the art.
Disclosure of Invention
Based on the above problems, the invention discloses a support system for a reverse construction work well body.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the support system for the reverse construction method working well main body comprises a crown beam template, a plurality of layers of ring beam templates and a plurality of layers of side wall support structures;
the crown beam template comprises a crown beam side die, a crown Liang Zhuleng layer and a crown Liang Cileng layer are sequentially laid on the outer side of the crown beam side die, and a plurality of pairs of wire drawing rods penetrate through the crown Liang Cileng layer, the crown Liang Zhuleng layer and the crown beam side die and are directly inserted into the soil body side;
The ring beam template comprises a ring beam side die, a ring beam main stupefied layer and a ring beam secondary stupefied layer are sequentially paved outside the ring beam side die, the ring beam side die further comprises a plurality of water stop screws, the water stop screws penetrate through the ring beam secondary stupefied layer, the ring beam main stupefied layer and the ring beam side die, the tail ends of the water stop screws are fixed inside a ring frame beam, the ring beam template is further provided with a plurality of inclined struts, flat struts and ground anchors, the ground anchors are embedded in an excavation surface, the flat struts are fixed on the surface of the excavation surface, two ends of the flat struts are respectively fixed on the ground anchors and the ring beam secondary stupefied layer, one end of each ring beam inclined strut is fixed on the ground anchor, and the other end of each ring beam inclined strut is fixedly connected with a junction of each water stop screw and each ring beam secondary stupefied layer;
The side wall support structure comprises a side wall template and side wall brackets, wherein the side wall template is formed by assembling and fixing a plurality of side wall sub-templates, a side wall main stupefied layer and a side wall secondary stupefied layer are sequentially laid on the outer side of the side wall template, the side wall brackets are fixedly connected with the side wall template, the side wall brackets are formed by assembling a plurality of support brackets, and each support bracket comprises an inner rod, a main girder and a reinforcing structure for fixedly supporting the inner rod and the main girder; the side wall supporting structure further comprises an operation platform, the operation platform is fixed on the ring beam through an operation support, and the side wall supporting structure is fixed on the operation platform.
A support system for a reverse construction work well body as claimed in claim 1, wherein: the crown beam side mold and the ring beam side mold are both made of wood templates, the crown Liang Zhuleng layer and the ring beam main stupefied layer are both formed by parallel arrangement of double-row square wood at intervals from bottom to top, and the crown Liang Cileng layer and the ring beam secondary stupefied layer are both formed by bundling double-spliced steel pipes.
Preferably, the wood template is a wood veneer with the thickness of 14mm, the size of the double-row square wood is 50 mm by 100mm, and the specification size of the double-spliced steel pipe is as follows
Preferably, the ring beam diagonal bracing is preferably a 50×50mm square timber diagonal bracing, wherein the distance between two adjacent ring beam diagonal bracing is 3m, the ground anchor is a No. 5 channel steel, and the embedding depth of the ground anchor is greater than 30 cm.
Preferably, the side wall main stupefied layer adopts double-spliced channel steel, double-spliced channel steel supports between the side wall template and the side wall secondary stupefied layer, the arrangement mode is parallel arrangement from bottom to top at intervals, the side wall secondary stupefied layer adopts double-row square timber, wherein the side wall template is also provided with a plurality of side wall pair wire drawing rods, and the side wall pair wire drawing rods all adopt water stop screws with water stop sheets installed in the middle.
Preferably, the model of the double-spliced channel steel is double-spliced 20 channel steel @500mm, wherein the longitudinal spacing of the double-spliced channel steel is smaller than 800mm, and the transverse spacing of the double-spliced channel steel is 500mm.
Preferably, the support bracket comprises at least the following models: 0.21 heightened section, 0.51 heightened section, 0.8 heightened section, 1.3 standard section and 2.0 main truss; the inner rod, the main beam and the reinforcing structure are all made of square steel pipes, and the fixed connection mode is welding.
Preferably, the main beam is made of a square steel pipe of 100×50×3mm, the inner rod is made of a square steel pipe of 50×3mm, and the reinforcing structure is made of a plurality of square steel pipes of 50×2 mm.
Preferably, the operation support comprises a first support piece and a second support piece which are perpendicular to each other, the second support piece is fixed on the inner side face of the ring beam through a connector, the first support piece is fixedly connected with the upper end face of the second support piece, and the first support piece and the second support piece are reinforced and supported and fixed through angle steel which is obliquely arranged.
Preferably, the upper surface of the first supporting piece is provided with a plurality of rows of fulcrums in an arrangement mode, the fulcrums are I-shaped steel, and the operation platform is fixed on the upper surface of the fulcrums.
Compared with the prior art, the invention has the following advantages:
The invention provides a supporting system for a deep foundation pit reverse construction method working well main body, and provides a crown beam template, a plurality of layers of ring beam templates and a plurality of layers of side wall supporting structures according to a deep foundation pit reverse construction method construction process, wherein the crown beam template and the ring beam templates are supported by side dies and external main stupefied layers and secondary stupefied layers, so that the self weight and soil layer stress of the whole engineering structure can be borne; the side wall supporting structure comprises a side wall template and side wall brackets, wherein the side wall brackets are formed by assembling a plurality of supporting brackets of different types according to actual heights, the supporting brackets can be prefabricated and assembled based on the actual heights, the supporting system is stable, recycling is convenient, and the construction efficiency is improved on the premise of guaranteeing the safety of the structure.
Drawings
FIG. 1 is a schematic diagram of a working well constructed by reverse construction in a supporting system for a deep foundation pit reverse construction working well main body;
FIG. 2 is a structural diagram of a ring beam support structure of the support system for a deep foundation pit reverse construction work well body of the present invention;
FIG. 3 is a block diagram of a side wall support structure of the support system for a deep foundation pit reverse construction work well main body of the present invention;
FIG. 4 is a model comparison diagram of different models of support brackets in a support system for a deep foundation pit reverse construction work well main body, wherein 4- (a), 4- (b), 4- (c), 4- (d) and 4- (e) respectively represent a 0.21 heightened section, a 0.51 heightened section, a 0.8 heightened section, a 1.3 standard section and a 2.0 main truss;
FIG. 5 is a partial schematic view based on section A of FIG. 3;
Fig. 6 is a schematic diagram of a side wall supporting structure of different structures assembled by using supporting brackets of different types in a supporting system of a deep foundation pit reverse construction method working well main body, wherein 6- (a) represents a side wall supporting structure assembled by using 1.3 standard knots and 2.0 main trusses, 6- (b) represents a side wall supporting structure assembled by using 2.0 main trusses and 0.8 heightened knots, 6- (c) represents a side wall supporting structure assembled by using two 1.3 standard knots and one 0.51 heightened knots, and 6- (d) represents a side wall supporting structure assembled by using 0.8 heightened knots, 1.3 standard knots and 2.0 main trusses in a working well ring-free Liang Ce.
Reference numerals:
1-crown beam; 2-ring beams; 3-ring beam templates; 301-ring beam side mold; 302, a ring beam main stupefied layer; 303-a water stop screw;
304-ring beam secondary layers; 305-ground anchors; 306-diagonal bracing; 307-positioning ribs;
4-a side wall supporting structure; 401-side wall templates; 402-a side wall bracket; 4021-a main beam; 4022-an inner bar;
403-side wall diagonal bracing; 404-an operating platform; 405-fulcrum; 406-a first support; 407-a second support;
408-angle steel; 409-U-shaped connector; 410-a support; 411-a first reinforcing bolt;
412-a second reinforcing bolt; 413-side wall square steel.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
The invention provides a support system for a reverse construction method working well main body and a construction method thereof, wherein the working well is constructed by adopting the reverse construction method, and the final presented effect is shown in figure 1, and the concrete steps are as follows:
Step one: selecting an excavation surface, and firstly completing construction of an enclosure structure and a crown beam structure on the excavation surface;
step two: draining accumulated water in the pit, excavating a foundation pit, excavating to the bottom height of the ring beam, performing support, drainage blind pipe and planting ribs to perform a layer of ring beam 2;
Step three: after the current ring beam 2 is completed, a side wall between the previous ring beam and the current ring beam 2 (the side wall between Shi Zuoguan beams 1 and the ring beam 2 is needed in the case of the first layer of ring beam); meanwhile, when the current ring beam 2 reaches the strength required by design, excavating a next layer of foundation pit;
repeating the second and third steps until at least eight layers of main body structures above the ring beam 2 are completed;
Step four: draining accumulated water in the pit, excavating a foundation pit, excavating to the bottom height of the ring beam, applying an anchor spraying support, a drainage blind pipe and a waterproof board, and applying side walls of the ring beam 2 and the ring beam 2, wherein the ring beam exists on one side of the working well, and the ring beam does not exist on the other side (as shown in the figure 1);
step five: applying an anchor spraying support and a drainage blind pipe waterproof plate and a side wall;
step six: after the side wall concrete meets the design requirement, draining accumulated water in the pit, excavating a foundation pit, and excavating to the bottom height of the ring beam;
Step seven: repeating the fifth to sixth steps, excavating to a substrate, and carrying out substrate groove inspection;
Step eight: applying a bottom plate cushion layer, a waterproof plate, a drainage blind pipe and a bottom plate structure;
step nine: and (5) applying a waterproof plate, a drainage blind pipe and a side wall. After the shield passes, each layer plate and other internal structures are applied after the tunnel engineering is completed.
The supporting system comprises a crown beam template, a plurality of layers of ring beam templates 3 and a plurality of layers of side wall supporting structures 4, wherein N layers of ring beams are arranged in total after construction through a reverse construction method, and are HLKi respectively, wherein i is an integer from 1 to N, and according to the reverse construction method, n+1 layers of side walls exist, and in the embodiment and the attached figure 1, 10 layers of ring beams 2 and 11 layers of side walls exist;
The crown beam 1 has the main functions of bearing the dead weight and soil layer stress of the whole engineering structure, and the crown beam template comprises a crown beam side template, wherein the crown beam side template is constructed by adopting a wood template, and is preferably a 14mm thick wood plywood; the outer side of the crown beam side die is sequentially paved with a crown Liang Zhuleng layer and a crown Liang Cileng layer, wherein the crown Liang Zhuleng layer adopts double-row square timber, the square timber is supported between the crown beam side die and the crown Liang Cileng layer, the arrangement mode is parallel arrangement from bottom to top at intervals, the interval is preferably 200mm, and the size of the square timber is preferably 50mm 100mm; crown Liang Cileng layers are laid on the surface of each crown Liang Zhuleng layer, each crown Liang Cileng layer is formed by bundling double-spliced steel pipes, and the steel pipes are in the following size specifications: The crown beam template is also provided with a plurality of pairs of wire drawing rods, the pairs of wire drawing rods penetrate through the crown Liang Cileng layer, the crown Liang Zhuleng layer and the crown beam side die to be directly inserted into the soil body side, two ends of the wire drawing rods are welded on the crown Liang Cileng layer through fasteners, the effects of controlling the thickness of the template and preventing the die from being exposed are achieved, and meanwhile, side pressure and other loads are borne.
The ring beam template 3 comprises a ring beam side die 301, wherein the ring beam side die 301 is constructed by adopting a wood template, and is preferably a wood slab with the thickness of 14 mm; the outer side of the ring beam side die 301 is sequentially paved with a ring beam main stupefied layer 302 and a ring beam secondary stupefied layer 304, wherein the ring beam main stupefied layer 302 adopts double-row square timber, the square timber is supported between the ring beam side die 301 and the ring beam secondary stupefied layer 304, the arrangement mode is parallel arrangement from bottom to top at intervals, the interval is preferably 200mm, and the size of the square timber is preferably 50 x 100mm; the surface of the ring beam main stupefied layer 302 is paved with a ring beam secondary stupefied layer 304, the ring beam secondary stupefied layer 304 is formed by bundling double-spliced steel pipes, and the size specification of the steel pipes is as follows: The ring beam 3 is further provided with a plurality of water-stop screws 303, the water-stop screws 303 penetrate through the ring beam secondary corrugated layer 304, the ring beam main corrugated layer 302 and the ring beam side die 301 to be inserted into the ring frame beam, two ends of each water-stop screw 303 are welded on the ring beam secondary corrugated layer 304 through fasteners, the functions of controlling the thickness of a template and preventing a die from being exposed are achieved, and meanwhile lateral pressure and other loads are borne. Before the next layer is temporarily not excavated, the ring beam template 3 is further provided with a plurality of diagonal braces 306, a flat brace and a ground anchor 305, wherein the ground anchor 305 is pre-buried in the excavation surface, the flat brace is fixed on the surface of the excavation surface, the ring beam secondary corrugated layer 304 is connected with the ground anchor 305, one end of the diagonal brace 306 is fixed on the ground anchor 305, the other end forms a certain included angle with the excavation surface, the joint of the water stop screw 303 and the ring beam secondary corrugated layer 304 is fixedly connected, and the diagonal brace 306 and the flat brace can play a role of auxiliary support. Wherein, the inclined strut 306 is preferably a 50X 50mm square timber inclined strut, the distance between two adjacent inclined struts 306 is 3m, the ground anchor is preferably a No. 5 channel steel, and the embedding depth is not less than 30cm, thereby ensuring that the inclined strut 306 can achieve a stable supporting effect.
After the installation of the ring beam template 3 is completed, the upper part of the ring beam is obliquely arranged and reserved before concrete pouringThe PVC sleeve is used for the bottom side wall pouring hole to be used as an exhaust hole, the distance is 1m, and a pouring funnel is arranged before concrete pouring.
The side wall supporting structure 4 comprises a side wall template 401 and a side wall bracket 402, wherein the side wall template 401 is formed by splicing and fixing a large-area PVC polymer template, a side wall main corrugated layer and a side wall secondary corrugated layer are sequentially paved on the outer side of the side wall template 401, the side wall main corrugated layer adopts double-spliced channel steel, the double-spliced channel steel is supported between the side wall template and the side wall secondary corrugated layer, the arrangement mode is parallel arrangement from bottom to top at intervals, the dimension of the double-spliced channel steel is preferably 20 channel steel@500 mm, the longitudinal spacing is not more than 800mm, and the transverse spacing is 500mm; the surface of the side wall main stupefied layer is paved with a side wall secondary stupefied layer, the side wall secondary stupefied layer adopts double-row square lumber, the size model of the side wall secondary stupefied layer is preferably double-row 50 x 100mm square lumber @200mm, the side wall template is also provided with a plurality of pairs of wire drawing rods, the wire drawing rods are all provided with water stop screws with water stop sheets in the middle, the water stop sheets are round (the thickness is not less than 2mm, the diameter is not less than 3 cm) or square (the thickness is not less than 2mm, the size is not less than 4 x 4 cm), and the water stop screws penetrate through the side wall secondary stupefied layer, the side wall main stupefied layer and the side wall template 401 to be directly inserted into the side wall.
Before pouring the side wall short side wall synchronously constructed with the ring beam 2, the bottom plate or the side wall, embedding a side wall formwork support system pull ring, and adopting boltsThe length of the anchored side wall is not less than 35d, the exposed part is bent into a ring shape, and the effective extension length is not less than 400mm. The mutual distance between the embedded parts is 600mm, and the embedded parts are ensured to be on the same straight line by requiring a pull-through line during on-site embedding. Before the tie bolts are pre-buried, additional steel bars and tie ring points are added at corresponding positions to prevent the embedded parts from running or deflecting when concrete is poured.
The side wall bracket is formed by assembling a plurality of support brackets with different types according to the actual height, as shown in fig. 4, wherein the support brackets at least comprise the following types: 0.21 heightened section, 0.51 heightened section, 0.8 heightened section, 1.3 standard section and 2.0 main truss. Except for 0.21 heightening section, the support brackets of the other models comprise an inner rod 4022, a main beam 4021 and a reinforcing structure for fixedly supporting the inner rod and the main beam, wherein the inner rod 4022, the main beam 4021 and the reinforcing structure are all made of square steel pipes, and the fixed connection mode is welding; wherein the main beam 4021 is made of a 100×50×3mm square steel tube, the inner rod 4022 is made of a 50×3mm square steel tube, and the reinforcing structure is made of a plurality of 50×2mm square steel tubes.
Specifically, the heights of the 0.21 heightened section main beam 4021 and the inner rod 4022 are 210mm, wherein the main beam 4021 and the inner rod 4022 are independently arranged, and a reinforcing structure is not arranged; the 0.51 heightening section is similar to the 0.8 heightening section in shape, and comprises a main beam 4021 with the height of 500mm and an inner rod 4022 fixedly connected with one end of the main beam 4021, wherein a certain included angle is formed between the main beam 4021 and the inner rod 4022, the reinforcing structure comprises two square steel pipes with the size of 50 multiplied by 2mm, one square steel pipe is parallel to the main beam 4021 and fixed at the other end of the inner rod 4022, and the other square steel pipe is perpendicular to the main beam 4021 and fixedly welded with the inner rod to form a similar triangular support structure; 1.3 the main girder 4021 and the inner rods 4022 of the standard section are arranged in parallel, wherein the reinforcing structure comprises a plurality of parallel rods fixedly connecting the main girder 4021 and the inner rods and inclined ribs obliquely fixed between two adjacent parallel rods; 2.0 Main truss includes a structure similar to the 1.3 standard knot structure in that main beams 4021 are at an angle to inner rods 4022, preferably at 77. Specifically, when the side wall bracket is arranged, the combination assembly is carried out according to the practical height selection adaptation model, wherein a main beam 4021 in the bracket support is fixedly connected with the side wall template. Wherein the support bracket can be prefabricated to assemble based on actual height, the support system is stable, is convenient for retrieve reuse, improves the efficiency of construction under the prerequisite of guaranteeing structural safety. As shown in fig. 5, a side wall square steel 413 is filled between the side wall bracket 402 and the side wall template 401; the side wall bracket 402 is fixedly connected with the side wall template 401 through various fixed connection mechanisms, wherein the side wall bracket 402 comprises two types, and is directly fixedly connected with the side wall template 401 through a second reinforcing bolt 412 pre-embedded in the side wall template 401, or is riveted on the side wall template 401 through a U-shaped connecting piece inserted into the side wall template 401, and then is fixedly connected with the side wall bracket 402 through an external supporting piece 410 and a first reinforcing bolt 411.
In addition, the side wall supporting structure further comprises a side wall diagonal brace 403 and an operation platform, wherein the side wall support is fixed on the operation platform, the operation platform 404 is made of a 10mm thick steel plate, the operation support is fixedly arranged on the inner side surface of the ring beam 2, the operation support comprises a first supporting piece 406 and a second supporting piece 407 which are mutually perpendicular, the second supporting piece 407 is fixedly connected on the inner side surface of the ring beam through a connector, the material of the second supporting piece 407 is preferably double-spliced channel steel, the first supporting piece 406 is fixedly connected with the upper end surface of the second supporting piece 407, preferably welded, the material of the first supporting piece 406 is preferably 14# I-steel, a plurality of rows of supporting points 405 are arranged on the upper surface of the first supporting piece 406 in an arrayed manner, the supporting points 405 are I-steel, and the operation platform is fixed on the upper surface of the supporting point 405; wherein the first supporting member 406 and the second supporting member 407 are supported and fixed in a reinforced manner by the angle steel 408 which is arranged obliquely.
As shown in fig. 6, a side wall bracket assembled by a plurality of support brackets with different types is provided, wherein the specific construction method is as follows:
assembling the die carrier: and pre-assembling the side wall template and connecting the side wall bracket structure on the working surface according to the drawing requirement. Assembling the side wall template according to the length of 3.6m, and finally connecting the side wall bracket structure into a whole by using a 48-circle steel pipe;
and (3) installing embedded parts: as shown in the figure, a side wall support die frame system pull-tie ring is arranged at the corresponding position of the poured ring beam according to the figure, wherein the diameter of the embedded bolt is not less than that of the embedded bolt Is arranged at a pitch of 600 mm. The lower opening of the template is tied when the side wall of the main body is poured;
Die carrier drawknot: the mounting of the pressing beam channel steel is fastened with the embedded foundation bolt in a drawknot manner; the lower opening is fastened with the embedded bolt tie during ring beam pouring, and the interval is 600mm;
And (3) diagonal bracing installation: and inclined supporting points are arranged on the operation platform at intervals of 600 mm. Installing a side wall diagonal brace 403, and connecting the diagonal braces into a whole in the transverse and longitudinal directions by adopting 48 steel pipes;
And (3) concrete pouring: rechecking the position of the side wall supporting structure before concrete pouring, and adjusting verticality again according to the requirement to recheck the fastening state of the connecting piece; and pouring the concrete layer by layer according to the construction scheme, wherein the pouring process needs to pay attention to the states of the side wall templates and the side wall brackets.
And (3) demolding the template: loosening the connection between the units by taking the length of 3.6m as a unit; and firstly removing the drawknot bolt nut and the side wall diagonal brace, and then removing the 300 x 1200mm or 200 x 1500 mm template of the small block above to carry out demoulding.
And (3) moving a die carrier: and (3) matching with lifting casters to translate the template, and then using a crane to sequentially move the unit die carrier to the next construction section.
Preferably, the operation platform is further provided with a tray buckling frame jacking, one end of the side wall diagonal bracing is fixed on the tray buckling frame jacking, the other end of the side wall diagonal bracing is fixed on the side wall bracket, and the side wall diagonal bracing is preferably made ofSteel pipe or/>And (3) a steel pipe.
In the construction process, the accuracy of the axial position and the verticality of the part of the side wall is ensured, so that the butt joint of the upper side wall and the lower side wall is vertical and smooth. For the single-sided side wall template, a single-sided lateral support steel type steel tripod is adopted and fixed by pre-embedding phi 25 anchor bolts and support cushion blocks. The longitudinal distance is 150mm away from the surface of the side wall, and the longitudinal distance is equal to the distance between the vertical keels of the template.
The foregoing is a description of embodiments of the invention, which are specific and detailed, but are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (10)
1. The utility model provides a support system to deep basal pit reverse construction method work well main part which characterized in that:
The support system comprises a crown beam template, a plurality of layers of ring beam templates and a plurality of layers of side wall support structures;
the crown beam template comprises a crown beam side die, a crown Liang Zhuleng layer and a crown Liang Cileng layer are sequentially laid on the outer side of the crown beam side die, and a plurality of pairs of wire drawing rods penetrate through the crown Liang Cileng layer, the crown Liang Zhuleng layer and the crown beam side die and are directly inserted into the soil body side;
The ring beam template comprises a ring beam side die, a ring beam main stupefied layer and a ring beam secondary stupefied layer are sequentially paved outside the ring beam side die, the ring beam template further comprises a plurality of water stop screws, the water stop screws penetrate through the ring beam secondary stupefied layer, the ring beam main stupefied layer and the ring beam side die, the tail ends of the water stop screws are fixed inside a ring frame beam, the ring beam template is further provided with a plurality of inclined struts, flat struts and ground anchors, the ground anchors are embedded in an excavation surface, the flat struts are fixed on the surface of the excavation surface, two ends of the flat struts are respectively fixed on the ground anchors and the ring beam secondary stupefied layer, one ends of the ring beam inclined struts are fixed on the ground anchors, and the other ends of the ring beam inclined struts are fixedly connected with junction points of the water stop screws and the ring beam secondary stupefied layer;
The side wall support structure comprises a side wall template and side wall brackets, wherein the side wall template is formed by assembling and fixing a plurality of side wall sub-templates, a side wall main stupefied layer and a side wall secondary stupefied layer are sequentially laid on the outer side of the side wall template, the side wall brackets are fixedly connected with the side wall template, the side wall brackets are formed by assembling a plurality of support brackets, and each support bracket comprises an inner rod, a main girder and a reinforcing structure for fixedly supporting the inner rod and the main girder; the side wall supporting structure further comprises an operation platform, the operation platform is fixed on the ring beam through an operation support, and the side wall supporting structure is fixed on the operation platform.
2. A support system for a deep foundation pit reverse construction work well body as claimed in claim 1, wherein: the crown beam side mold and the ring beam side mold are both made of wood templates, the crown Liang Zhuleng layer and the ring beam main stupefied layer are both formed by parallel arrangement of double-row square wood at intervals from bottom to top, and the crown Liang Cileng layer and the ring beam secondary stupefied layer are both formed by bundling double-spliced steel pipes.
3. A support system for a deep foundation pit reverse construction work well body as claimed in claim 2, wherein: the wood template is a wood veneer with the thickness of 14mm, the size of double-row square wood is 50mm x 100mm, and the specification size of the double-spliced steel pipe is phi 48 x 3mm@1500mm.
4. A support system for a deep foundation pit reverse construction work well body as claimed in claim 1, wherein: the ring beam diagonal braces are preferably 50X 50mm square timber diagonal braces, wherein the distance between two adjacent ring beam diagonal braces is 3m, the ground anchors are No. 5 channel steel, and the embedding depth of the ground anchors is larger than 30cm.
5. A support system for a deep foundation pit reverse construction work well body as claimed in claim 1, wherein:
The side wall main stupefied layer adopts double-spliced channel steel, double-spliced channel steel supports between the side wall template and the side wall secondary stupefied layer, the arrangement mode is that the side wall secondary stupefied layer is arranged in parallel at intervals from bottom to top, the side wall secondary stupefied layer adopts double-row square timber, wherein the side wall template is further provided with a plurality of side wall pair wire drawing rods, and the side wall pair wire drawing rods all adopt water stop screws with water stop sheets installed in the middle.
6. A support system for a deep foundation pit reverse construction work well body as claimed in claim 5, wherein:
The model of the double-spliced channel steel is double-spliced 20 channel steel @500mm, wherein the longitudinal spacing of the double-spliced channel steel is smaller than 800mm, and the transverse spacing of the double-spliced channel steel is 500mm.
7. A support system for a deep foundation pit reverse construction work well body as claimed in claim 1, wherein:
The support bracket at least comprises the following models: 0.21 heightened section, 0.51 heightened section, 0.8 heightened section, 1.3 standard section and 2.0 main truss; the inner rod, the main beam and the reinforcing structure are all made of square steel pipes, and the fixed connection mode is welding.
8. A support system for a deep foundation pit reverse construction work well body as claimed in claim 7, wherein: the main beam is made of a 100X 50X 3mm square steel tube, the inner rod is made of a 50X 3mm square steel tube, and the reinforcing structure is made of a plurality of 50X 2mm square steel tubes.
9. A support system for a deep foundation pit reverse construction work well body as claimed in claim 1, wherein: the operation support comprises a first support piece and a second support piece which are perpendicular to each other, the second support piece is fixed on the inner side face of the ring beam through a connector, the first support piece is fixedly connected with the upper end face of the second support piece, and the first support piece and the second support piece are reinforced and supported and fixed through angle steel which is obliquely arranged.
10. A support system for a deep foundation pit reverse construction work well body as claimed in claim 9, wherein: the upper surface of the first supporting piece is provided with a plurality of rows of supporting points in an arrangement mode, the supporting points are I-shaped steel, and the operating platform is fixed on the upper surface of the supporting points.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311475813.1A CN118187078A (en) | 2023-11-07 | 2023-11-07 | Supporting system for deep foundation pit reverse construction method working well main body |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311475813.1A CN118187078A (en) | 2023-11-07 | 2023-11-07 | Supporting system for deep foundation pit reverse construction method working well main body |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN120520585A (en) * | 2025-07-24 | 2025-08-22 | 中铁隧道局集团有限公司 | Shaft construction method |
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2023
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN120520585A (en) * | 2025-07-24 | 2025-08-22 | 中铁隧道局集团有限公司 | Shaft construction method |
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