CN113279414B - Octagonal working pit support component and installation construction method thereof - Google Patents
Octagonal working pit support component and installation construction method thereof Download PDFInfo
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- CN113279414B CN113279414B CN202110714316.7A CN202110714316A CN113279414B CN 113279414 B CN113279414 B CN 113279414B CN 202110714316 A CN202110714316 A CN 202110714316A CN 113279414 B CN113279414 B CN 113279414B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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Abstract
本发明公开了一种八边形工作坑支护构件及其安装施工方法，包括由对接构成八边形工作坑护壁支护构件，框型板和直板通过对称分布的H型钢横撑连接；工作坑护壁包括设有钢板加劲肋的内、外两层钢板，工作坑护壁底部设有与相邻层间工作坑护壁相接的层间连接件；通过H型钢横撑连接工作坑护壁，通过层间连接件连接相邻八边形支护构件，实施顶管或定向钻工作坑层层开挖，以及开挖后的八边形支护构件的逆向拆卸回收。该工作坑的支护结构能够从地面分层向下开挖，逆向分层回收支护构件，减少浪费，避免施工中发生难沉、突沉、偏沉等事故风险，具有重复利用、节省空间、降低成本、减少能耗、绿色环保的优点。
The present invention discloses an octagonal working pit support component and an installation construction method thereof, including an octagonal working pit retaining wall support component formed by docking, wherein a frame plate and a straight plate are connected by symmetrically distributed H-shaped steel cross braces; the working pit retaining wall includes inner and outer two layers of steel plates provided with steel plate stiffening ribs, and the bottom of the working pit retaining wall is provided with an interlayer connector connected to the adjacent interlayer working pit retaining wall; the working pit retaining wall is connected by H-shaped steel cross braces, and adjacent octagonal support components are connected by interlayer connectors, and the working pit is excavated layer by layer by jacking pipe or directional drilling, and the octagonal support components after excavation are reversely disassembled and recovered. The support structure of the working pit can be excavated layer by layer from the ground, and the support components can be recovered in reverse layers, thereby reducing waste and avoiding the risk of accidents such as difficult sinking, sudden sinking, and partial sinking during construction, and has the advantages of reuse, space saving, cost reduction, energy consumption reduction, and green environmental protection.
Description
Technical Field
The invention relates to the technical field of urban construction engineering, in particular to an octagonal working pit supporting member and an installation and construction process thereof when an urban municipal pipeline is constructed by adopting a jacking pipe and a directional drill.
Background
With the development and construction of cities, the construction scale and the variety of various municipal infrastructure supporting pipelines, other underground structures and facilities in the city are increased to different degrees, and overground buildings are increased increasingly, so that the underground space of the city is tense. Meanwhile, the reasons of city traffic dredging, underground and on-ground existing pipelines and structures protection and the like caused by the fact that the construction site occupies the existing traffic space are considered, and when other municipal foundation matched pipelines which are newly built at the later stage are constructed, the construction space is often limited to different degrees, so that non-slotting construction becomes the preferred mode of various pipeline construction when the construction space is limited, in particular to pipe jacking construction, directional drilling construction and the like.
When the urban underground pipeline jacking pipe or the directional drill is used for construction, a working pit is required to be arranged according to the construction requirement, and the working pit comprises a pushing working pit and a receiving working pit. Because of the limitation of construction sites and other existing pipelines, underground structures and overground structures, the working pit needs to adopt a safe and reliable supporting form, and the smooth proceeding of pipe jacking construction is ensured.
According to the construction conditions of laying urban underground pipelines at present, common methods of working pit supporting forms of pipe jacking construction (or directional drilling construction) include reinforced concrete retaining walls (reverse construction), reinforced concrete open caissons and the like, and the following defects exist in the supporting forms:
1. The reinforced concrete wall protection reverse construction method is characterized in that a layer of support is excavated downwards from the ground (the depth is not more than 2 m), the working procedures are complicated (the working procedures of formwork supporting, pouring, maintenance, formwork removing and the like), and the construction period is long.
2. The reinforced concrete open caisson is formed by casting in situ (barrel body), earth is dug and conveyed from the inner layer of the shaft in layers, so that the open caisson gradually sinks under the action of dead weight, and after reaching a preset design elevation, bottom sealing is performed, so that the requirements on the relative construction technology are high, the construction period is long, difficult sinking, sudden sinking, partial sinking and the like easily occur in the construction, and the accident risk is high.
3. The reinforced concrete structure supported by the working pit can be only utilized once, so that the investment cost of engineering is increased intangibly, and resource waste is caused.
4. After the construction of the working pit supporting structure is completed, only the reinforced concrete structure within 3.5m from the ground is broken, the rest part of the working pit supporting structure is permanently existing underground, unnecessary waste is caused to urban underground space, natural environment is affected, and the construction space of the follow-up underground pipeline is occupied.
In view of the above, development of a novel construction pit support form and construction process are needed, and the development and construction of the foundation pipeline construction of the city are necessary routes.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide an octagonal working pit supporting prefabricated assembly component and an installation construction process thereof. The supporting structure of the working pit can be excavated downwards from the ground layer by layer, the supporting member is recycled in a reverse layer by layer manner, waste is reduced, accident risks such as sinking difficulty, sinking suddenly and sinking eccentrically in construction are avoided, and the supporting structure has the advantages of recycling, space saving, cost reduction, energy consumption reduction and environmental protection.
The invention is realized by the following technical scheme.
The octagonal working pit supporting member comprises a surrounding frame-shaped working pit protecting wall, wherein the surrounding frame-shaped working pit protecting wall is formed by butting frame plates and straight plates, the frame plates and the straight plates are connected through H-shaped steel cross braces which are symmetrically distributed, the working pit protecting wall comprises an inner layer of steel plate and an outer layer of steel plate, steel plate stiffening ribs are arranged between the inner layer of steel plate and the outer layer of steel plate, and a connecting piece connected with the adjacent interlayer working pit protecting wall is arranged at the bottom of the working pit protecting wall.
The H-shaped steel cross braces are connected with the working pit retaining wall, the adjacent octagonal supporting members are connected through the interlayer connecting pieces, the pipe jacking or directional drilling working pit layer by layer excavation is implemented, and the octagonal supporting members after excavation are reversely disassembled and recycled.
As an improvement, the steel plate stiffening ribs are arranged at equal intervals along the inner layer and the outer layer of the steel plate of the working pit retaining wall.
The steel plate stiffening rib comprises a vertical plate and two horizontal stiffening rods connected between the vertical plate and the two horizontal stiffening rods, wherein the vertical plate is welded at 90 degrees along the inner steel plate wall and the outer steel plate wall of the working pit protection wall, and the two horizontal stiffening rods are welded along the inner steel plate wall and the outer steel plate wall of the working pit protection wall respectively.
As an improvement, the steel plate stiffening ribs are vertical frame-shaped plates, and flanges at two ends of the frame-shaped plates are welded with the inner and outer steel plate walls of the working pit retaining wall.
As improvement, the frame-shaped plate and the straight plate are butted to form an octagonal supporting member, the butted surface is 45-degree inclined, the inclined directions of the contact surfaces are the same, and a rubber water stop belt or a rubber abrasion pad is arranged between the butted surfaces.
As an improvement, the outer surfaces of the inner layer steel plate and the outer layer steel plate of the working pit protection wall are corrugated.
As an improvement, the H-shaped steel cross braces are tied between the four sides of the octagonal supporting member and the corner cutting member, at least four pairs of H-shaped steel cross braces are symmetrically distributed along the octagonal working pit protection wall, and the H-shaped steel cross braces are connected in a hanging or threaded mode.
As an improvement, at least one pair of H-section steel wales is tied between the long side and the corner cut member of the octagonal support member, and at least another pair of H-section steel wales is tied between the long side and the short side of the octagonal support member.
As an improvement, the H-shaped steel cross brace which is tied between the long side and the short side is further connected with a stiffening brace, the stiffening brace is a connecting ring welded at the middle part of the H-shaped steel cross brace, a pair of stiffening braces are horizontally buckled on the connecting ring, and the other ends of the stiffening braces are respectively connected between the long side and the short side of the inner wall of the working pit protection wall and form a cross structure with the H-shaped steel cross brace.
The embodiment of the invention provides an installation construction method for supporting a component by utilizing an octagonal working pit, which comprises the following steps:
Vertically excavating from the ground downwards along the position of a jacking pipe or a directional drilling working pit, excavating a layer of working pit with the same height and area as those of the working pit retaining wall, splicing the working pit retaining walls, and buckling an H-shaped steel cross brace to form a layer of octagonal working pit supporting member;
Then vertically excavating downwards, excavating a layer of working pit, and splicing and assembling a layer of working pit supporting member by using a clamp, a fastener or a bolt, wherein the maximum height of each layer is not more than 2m;
Sequentially supporting from top to bottom until reaching a preset design elevation, and sealing the bottom by reinforced concrete;
After the working pit excavation and supporting assembly are completed, the laying direction of the bottommost two-layer pipeline is replaced with the special section of the hole, and one side is replaced in sequence;
After the installation and construction of the pipeline and the auxiliary facilities are completed, the working pit supporting member is disassembled from the bottom while backfilling according to layers in sequence until the backfilling is completed, and the working pit supporting member is recovered.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
1. The supporting structure adopts finished components, is safe and reliable in construction, simple in operation procedure, relatively small in volume and weight and convenient to transport and install.
2. The supporting structure is in an octagonal overlooking shape, and has good stress condition, stable structure and convenient disassembly relative to a rectangle.
3. The supporting structure adopts the cross section of the box-shaped structure with the inner wall and the outer wall, is beneficial to improving the structural rigidity, is not easy to deform, is safer and more durable, and has flat and uniform appearance compared with the structure with only outer wall plates and stiffening ribs.
4. The support member is easy to install and construct, assemble on site, disassemble after construction and reuse, is beneficial to walking a sustainable development road, is beneficial to shortening the construction period, improving the production efficiency and reducing the adverse effects on urban traffic and resident life.
5. The supporting structure adopts finished components, is centrally managed and maintained, does not produce pollutants, saves energy, reduces emission and protects the environment.
6. The supporting structure is completely dismantled after construction, so that energy conservation, emission reduction and environmental protection are facilitated, the underground space is free from leaving after construction of the supporting member, and compared with the traditional reinforced concrete supporting structure, the underground space is saved, and the laying space of the follow-up municipal matched pipeline is not influenced.
7. The supporting structure adopts steel (or composite material) components, improves the production efficiency, has advanced technology, saves resources and energy sources, and is beneficial to the development of national economy.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and constitute a part of this specification, are incorporated in and constitute a part of this specification and do not limit the application in any way, and in which:
FIGS. 1 (a), (b) are schematic structural views of a pit supporting member;
FIG. 2 is a schematic A-A cross-sectional view of a pit support member;
FIGS. 3 (a), (b) are side cross-sectional views of a retaining wall of a pit support member;
FIG. 4 is a cross-sectional view of a retaining wall of a pit support member;
FIG. 5 is an elevation view of a portal tailoring section of a work pit support member;
FIG. 6 is a cross-sectional view of a tunnel portal tailoring section of a work pit support member;
FIG. 7 is a construction of a single layer finite element computational model of a pit (ejector);
FIG. 8 is a three-dimensional view of a single layer finite element computational model of a pit (ejector);
FIG. 9 shows a depth of 16-18 m single-layer stress cloud pictures;
FIG. 10 is a single-layer structure deformation cloud image with a buried depth of 16-18 m.
In the figure, the steel plate is characterized by comprising a working pit retaining wall 1, a steel plate stiffening rib 2, a 3-H-shaped steel cross brace, a 4-interlayer connecting piece, a 5-45-degree contact surface, a 6-vertical interlayer contact surface, a 7-lower inner arc-shaped framework, an 8-upper inner arc-shaped framework and a 9-jacking pipe inlet and outlet hole.
Detailed Description
The present invention will now be described in detail with reference to the drawings and the specific embodiments thereof, wherein the exemplary embodiments and descriptions of the present invention are provided for illustration of the invention and are not intended to be limiting.
As shown in fig. 1 (a) and (b), an octagonal working pit supporting member comprises a working pit retaining wall 1 in a surrounding frame shape, wherein the working pit retaining wall 1 is formed by welding an inner layer of steel plate and an outer layer of steel plate through steel plate stiffening ribs 2, and a plurality of steel plate stiffening ribs 2 are arranged at equal intervals along the inner layer of steel plate and the outer layer of steel plate of the working pit retaining wall 1.
In one embodiment, the steel plate stiffening rib 2 comprises a vertical plate and two horizontal stiffening rods connected between the vertical plate and the two horizontal stiffening rods, and the steel plate stiffening rib is uniformly stressed and is firm in structure. The vertical plates are welded at 90 degrees along the inner and outer steel plate walls of the working pit retaining wall 1, and the two horizontal reinforcement bars are welded along the inner and outer steel plate walls of the working pit retaining wall 1 respectively.
In another embodiment, the steel plate stiffening ribs 2 are vertical frame plates, and flanges at two ends of the frame plates are respectively welded with the inner steel plate wall and the outer steel plate wall of the working pit protection wall.
The surrounding frame-shaped working pit retaining wall 1 is a rectangle with four cut corners to form an octagonal structure, a butt joint structure is arranged between four sides of the octagon and corner cutting members, a butt joint surface is a 45-degree contact surface 5, and a rubber abrasion pad is additionally arranged on the butt joint surface. The 45-degree contact surfaces 5 have the same inclination direction so as to facilitate assembly and disassembly. H-shaped steel cross braces 3 are tied between the four sides of the octagon and the corner cutting members, and the H-shaped steel cross braces 3 are symmetrically distributed along the work pit protection wall 1 of the octagon, so that the whole stress is uniform, and the safety and the reliability are realized.
As shown in fig. 2 and 4, the working pit retaining wall 1 is a multi-layer structure, and the vertical plates of the steel plate stiffening ribs 2 between the inner wall and the outer wall of each layer of working pit retaining wall 1 are of a plurality of vertical butt joint structures. The upper and lower ends of the inner wall of each layer of working pit retaining wall 1 are provided with interlayer connecting pieces 4 (hoops, fasteners or bolts), and a rubber abrasion pad is additionally arranged on a vertical interlayer contact surface 6 between each layer of working pit retaining wall 1.
The octagonal working pit retaining wall 1 is layered and segmented, is made of cast or steel (or aluminum alloy, steel belt polyethylene, polypropylene and other composite materials), is suitable for the working pit with the width of 4-8 m and the length of 4-9.5 m, has the height of 1.5m and 2m (the hole section is specially made, the height is 3m and 4 m), has the least more than 4 layers (the total depth is not less than 6 m), and has the least 4 blocks (or 4 sections) in each layer.
The wall thickness of the octagonal working pit retaining wall 1 is 200-300 mm, steel plate stiffening ribs are welded between the inner wall and the outer wall of each component, the horizontal inclination angle of each layer of adjacent 2 contact surfaces is 45 degrees, the vertical distance between connecting points of the adjacent two layers of adjacent 2 contact surfaces by adopting an H-shaped steel cross brace 3 is not less than 1m, the upper layers and the lower layers are connected by adopting clamps and fasteners (or bolts), the clamps and the fasteners (or bolts) are uniformly arranged on each component, and the upper layers and the lower layers are matched with each other.
The rubber abrasion pads with the thickness of 10 mm-20 mm are additionally arranged between the transverse direction (45-degree contact surface) and the vertical direction of the octagonal working pit supporting member so as to facilitate installation and disassembly, reduce collision and abrasion between the members and prolong the service life of the members.
As shown in fig. 1 (a), fig. 2 and fig. 3 (a), the invention is a small octagonal working pit supporting member, H-shaped steel cross braces 3 are symmetrically tied between the long edges of the inner wall of the working pit protecting wall 1 and corner cutting members, two pairs of H-shaped steel cross braces 3 are arranged in each layer of working pit protecting wall 1, the H-shaped steel cross braces are in hanging connection or threaded connection, and the inner wall of each layer of working pit protecting wall 1 is distributed up and down.
As shown in fig. 1 (b), fig. 2 and fig. 3 (b), an H-shaped steel cross brace 3 is tied between the long side and the short side of the inner wall of the working pit protection wall 1, two pairs of H-shaped steel cross braces 3 are arranged in each layer of working pit protection wall 1, and the inner wall of each layer of working pit protection wall 1 is distributed up and down. The H-shaped steel cross brace 3 with a pair of diagonal lines is further tied with a stiffening brace, the stiffening brace is a connecting ring welded at the middle part of the H-shaped steel cross brace 3, the pair of stiffening braces are horizontally buckled on the connecting ring, the other ends of the stiffening braces are respectively connected between the long side and the short side of the inner wall of the working pit retaining wall 1, and a cross structure is formed between the stiffening brace and the H-shaped steel cross brace 3, so that the structure is relatively stable, safe and reliable.
The H-shaped steel cross brace 3 connects the octagonal working pit retaining walls 1 in block butt joint into a whole, and the multi-layer working pit retaining walls 1 are connected through fasteners or bolts 4 to form the working pit retaining wall 1 with a multi-layer structure.
As shown in fig. 5 and 6, the working pit retaining wall 1 is applied to various pipeline jacking pipes or directional drilling construction, a pipeline jacking pipe hole inlet and outlet opening 9 (pipeline laying direction) in the directional drilling construction is independently manufactured by casting or steel, a lower inner arc-shaped framework 7 is arranged at the upper part of the jacking pipe inlet and outlet opening 9, and an inner arc-shaped framework 8 is arranged at the lower part of the jacking pipe, so that the working pit retaining wall is beneficial to installation and disassembly, and is divided into two types of 3m and 4m in total height and 300mm in wall thickness. The hole of the directional drill is reserved on the supporting member directly.
In the invention, the octagonal working pit supporting member is made of steel members, each layer is at least divided into 4 blocks (or 4 sections), and the wall thickness is 200-300 mm. The inner wall and the outer wall of each component are welded by adopting steel plate stiffening ribs, the horizontal inclination angle of each layer of adjacent 2 contact surfaces is 45 degrees, the two adjacent layers are connected by adopting H-shaped steel cross braces, the vertical distance between connecting points is not less than 1m, the upper layer and the lower layer are connected by adopting hoops and fasteners (or bolts), the hoops and the fasteners (or bolts) are uniformly arranged on each component, and the upper layer and the lower layer are mutually matched.
The octagonal working pit supporting member is made of composite materials (such as steel band polyethylene, steel band polypropylene and the like), and the inner surface and the outer surface of the working pit retaining wall 1 are corrugated, so that the working pit supporting member is convenient to bear good stress conditions during construction. The ring stiffness is carried out according to the grade of not lower than 16-25 kN/m 2 (namely SN 16-SN 25) or city-A. Each layer is at least divided into 4 blocks (or 4 sections), and the maximum distance (namely the wall thickness) between the inner peak top and the outer peak top is 200-300 mm. The connection modes of the construction pit supporting member blocks and the layers are the same as those of the steel construction member.
The opening (pipeline laying direction) of the octagonal working pit supporting top pipe is independently manufactured by adopting casting or steel members, the inner arc-shaped structures at the upper part and the lower part are beneficial to installation and disassembly, the total height is 3m and 4m, the wall thickness is 300mm, and the directionally drilled opening is reserved on the supporting member directly.
The rubber abrasion pads with the thickness of 10 mm-20 mm are additionally arranged between the transverse direction (45-degree contact surface) and the vertical direction of the octagonal working pit supporting member so as to facilitate installation and disassembly, reduce collision and abrasion between the members and prolong the service life of the members.
When the invention is implemented, the octagonal working pit supporting member and the installation and construction process thereof adopt casting or steel or composite materials, and the reverse construction method comprises the following steps:
Vertically excavating from the ground downwards along the position of a jacking pipe or a directional drilling working pit, excavating a layer of working pit with the same height and area as those of the layer of working pit protection wall, splicing the four working pit protection walls, and buckling an H-shaped steel cross brace to form a layer of octagonal working pit supporting member, wherein rubber water stops (or rubber abrasion pads) are additionally arranged between the member blocks and blocks (or sections) and between the layers;
Then vertically excavating downwards, excavating a layer of working pit, and splicing and assembling a layer of working pit supporting member by using a clamp, a fastener or a bolt, wherein the maximum height of each layer is not more than 2m;
Sequentially supporting from top to bottom until reaching a preset design elevation, and sealing the bottom by reinforced concrete;
After the whole working pit is excavated and the support is assembled, the laying direction of the bottommost two-layer pipeline is replaced with the special section of the hole, and one side is replaced in sequence;
After the installation and construction of the pipeline and the auxiliary facilities are completed, the working pit supporting member is sequentially backfilled and disassembled from the bottom according to layers until reaching the ground, the working pit supporting member is completely disassembled, and the prefabricated member of the working well supporting structure after the disassembly is transported back for inspection and maintenance, so that the safety and reliability in the next assembly are ensured.
The octagonal working pit supporting member is suitable for being layered and segmented, the width of a working pit is 4 m-8 m, the length of the working pit is 4 m-9.5 m, the height of each layer is 1.5m and 2m (the hole section is specially made, the height is 3m and 4 m), the number of layers is at least 4 (the total assembly depth is not less than 6 m), each layer is at least divided into 4 blocks (or 4 sections), and the maximum length of a single member is about 4.5m.
During site construction, finished components (cast, steel or composite materials) can be adopted, layered and segmented manufacturing, site assembly construction and post-construction disassembly are realized, transportation and hoisting are facilitated, off-site inspection and maintenance are realized, deformation is not easy, and the structure is safe and reliable and is reused. Each member includes a body structure, connectors (clips, latches, fasteners, etc.), supports, and the like.
The size of the working pit is divided according to the pipe diameter of the drainage (rainwater and sewage) pipeline, and the working pit is also suitable for professional pipelines such as water supply, heating power, gas and the like, electric power, communication pipes and culverts and the like, and the following table 1 is shown in detail:
table 1 working pit size list for pipe-jacking construction
The data in the table is only the size of a common working pit and the range of the applicable pipe diameter, and the net size of the working pit plane can be assembled according to the size of the prefabricated part of the working pit and comprises a plurality of specifications such as 6m multiplied by 5m, 6m multiplied by 6m, 7.5m multiplied by 4m, 7.5m multiplied by 5m, 8m multiplied by 8m, 9.5m multiplied by 5m, 9.5m multiplied by 6m and the like, and the net size can be specifically adjusted according to the actual condition of the construction site and the condition of the adopted equipment.
Table 2 working pit size list for directional drilling construction
As shown in fig. 7 and 8, the internal structure and three-dimensional view of the single-layer finite element calculation model of the working pit supporting structure are shown.
As shown in fig. 9 and 10, the working pit supporting structure is a single-layer stress cloud picture and a deformation structure cloud picture when the buried depth is 16-18 m. From the stress cloud, the stress of the structural member in the range of about 85.8% is less than 341MPa, and the stress in the range of about 79.8% is less than 256MPa. The other areas with higher stress are all positioned at the boundary and the part where the components cross, belong to model errors or normal stress concentration phenomenon, and can be solved by constructional measures.
According to the deformation cloud picture, the maximum inward displacement of the long side direction is 42mm, the deformation of the rest positions is not large, the buckling stability of the structure is calculated, and the stability of the structure can be effectively ensured by reasonably arranging the internal support.
Through the analysis, the structure can meet the construction process requirements, and the structure is widely applied to the construction of various pipeline jacking pipes or directional drills, and can shorten the construction period and improve the production efficiency under the condition of ensuring the safety.
The invention is not limited to the above embodiments, and based on the technical solution disclosed in the invention, a person skilled in the art may make some substitutions and modifications to some technical features thereof without creative effort according to the technical content disclosed, and all the substitutions and modifications are within the protection scope of the invention.
Claims (9)
1. The octagonal working pit supporting member is characterized by comprising a surrounding frame-shaped working pit protecting wall, wherein the surrounding frame-shaped working pit protecting wall is formed by butting a frame plate and a straight plate, and the frame plate and the straight plate are connected through symmetrically distributed H-shaped steel cross braces;
the working pit retaining wall comprises an inner layer of steel plate and an outer layer of steel plate, steel plate stiffening ribs are arranged between the inner layer of steel plate and the outer layer of steel plate, and an interlayer connecting piece connected with the adjacent interlayer working pit retaining wall is arranged at the bottom of the working pit retaining wall;
the H-shaped steel cross braces are connected with the working pit protection wall, at least one pair of H-shaped steel cross braces are tied between the long side and the corner cutting member of the octagonal supporting member, and at least one other pair of H-shaped steel cross braces are tied between the long side and the short side of the octagonal supporting member;
And connecting adjacent octagonal support members through interlayer connectors, excavating the jacking pipe or the directional drilling working pit layer by layer, and reversely disassembling and recycling the excavated octagonal support members.
2. An octagonal pit support member as claimed in claim 1, wherein the steel plate stiffeners are equally spaced along the inner and outer layers of the pit wall.
3. An octagonal pit support member as claimed in claim 1 wherein the steel plate stiffener comprises a vertical plate and two horizontal stiffener bars connected therebetween, the vertical plate being welded 90 ° along the inner and outer steel plate walls of the pit guard wall, the two horizontal stiffener bars being welded along the inner and outer steel plate walls of the pit guard wall, respectively.
4. An octagonal pit support member as claimed in claim 1 wherein the steel plate stiffener is a vertical frame plate, the flanges at the ends of the frame plate being welded to the inner and outer steel plate walls of the pit wall respectively.
5. An octagonal pit support member as claimed in claim 4, wherein a rubber water stop or rubber wear pad is provided between the abutment surfaces.
6. An octagonal pit support member as claimed in claim 1, wherein the outer surfaces of both the inner and outer steel plates of the pit wall are corrugated.
7. The octagonal working pit supporting member according to claim 1, wherein the H-steel cross braces are tied between four sides of the octagonal supporting member and the corner cutting member, at least four pairs of the H-steel cross braces are symmetrically distributed along the octagonal working pit supporting wall, and the H-steel cross braces are in hanging connection or threaded connection.
8. The octagonal working pit supporting member according to claim 1, wherein the stiffening struts are formed by welding a connecting ring along the middle of the H-shaped steel cross struts, a pair of stiffening struts are horizontally fastened on the connecting ring, and the other ends of the stiffening struts are respectively connected between the long side and the short side of the inner wall of the working pit protecting wall and form a cross structure with the H-shaped steel cross struts.
9. A mounting construction method using the octagonal working pit support member according to any one of claims 1 to 8, comprising:
Vertically excavating from the ground downwards along the position of a jacking pipe or a directional drilling working pit, excavating a layer of working pit with the same height and area as those of the working pit retaining wall, splicing the working pit retaining walls, and buckling an H-shaped steel cross brace to form a layer of octagonal working pit supporting member;
Then vertically excavating downwards, excavating a layer of working pit, and splicing and assembling a layer of working pit supporting member by using a clamp, a fastener or a bolt, wherein the maximum height of each layer is not more than 2m;
Sequentially supporting from top to bottom until reaching a preset design elevation, and sealing the bottom by reinforced concrete;
After the working pit excavation and supporting assembly are completed, the laying direction of the bottommost two-layer pipeline is replaced with the special section of the hole, and one side is replaced in sequence;
After the installation and construction of the pipeline and the auxiliary facilities are completed, the working pit supporting member is disassembled from the bottom while backfilling according to layers in sequence until the backfilling is completed, and the working pit supporting member is recovered.
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| CN114263184B (en) * | 2021-09-18 | 2023-07-25 | 中国十九冶集团有限公司 | Foundation pit supporting construction method |
| CN114278306A (en) * | 2021-12-13 | 2022-04-05 | 中铁上海工程局集团市政环保工程有限公司 | Micro pipe jacking operation working well supporting structure and construction process thereof |
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| CN109898516A (en) * | 2019-02-28 | 2019-06-18 | 温州国宁建设有限公司 | A kind of deep foundation pit supporting structure |
| CN111519635A (en) * | 2020-05-26 | 2020-08-11 | 徐�明 | Circular working pit supporting member and installation and construction process thereof |
| CN217150257U (en) * | 2021-06-25 | 2022-08-09 | 西安建筑科技大学 | An octagonal working pit support member |
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| CN109898516A (en) * | 2019-02-28 | 2019-06-18 | 温州国宁建设有限公司 | A kind of deep foundation pit supporting structure |
| CN111519635A (en) * | 2020-05-26 | 2020-08-11 | 徐�明 | Circular working pit supporting member and installation and construction process thereof |
| CN217150257U (en) * | 2021-06-25 | 2022-08-09 | 西安建筑科技大学 | An octagonal working pit support member |
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