CN114790758A - Prefabricated top plate and cushion layer for cover and excavation construction and construction method - Google Patents
Prefabricated top plate and cushion layer for cover and excavation construction and construction method Download PDFInfo
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- CN114790758A CN114790758A CN202210286078.9A CN202210286078A CN114790758A CN 114790758 A CN114790758 A CN 114790758A CN 202210286078 A CN202210286078 A CN 202210286078A CN 114790758 A CN114790758 A CN 114790758A
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- 238000010276 construction Methods 0.000 title claims abstract description 50
- 238000009412 basement excavation Methods 0.000 title claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 139
- 239000010959 steel Substances 0.000 claims abstract description 139
- 239000004567 concrete Substances 0.000 claims description 45
- 239000000463 material Substances 0.000 claims description 19
- 230000003014 reinforcing effect Effects 0.000 claims description 16
- 239000000843 powder Substances 0.000 claims description 12
- 239000004568 cement Substances 0.000 claims description 8
- 239000004088 foaming agent Substances 0.000 claims description 8
- 239000004576 sand Substances 0.000 claims description 7
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 6
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 239000010881 fly ash Substances 0.000 claims description 6
- 239000004571 lime Substances 0.000 claims description 6
- 239000002893 slag Substances 0.000 claims description 6
- 238000005452 bending Methods 0.000 claims description 5
- 238000007711 solidification Methods 0.000 claims description 4
- 230000008023 solidification Effects 0.000 claims description 4
- 239000011381 foam concrete Substances 0.000 claims description 3
- 239000012466 permeate Substances 0.000 claims description 3
- 239000002689 soil Substances 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 50
- 238000010586 diagram Methods 0.000 description 7
- 239000011229 interlayer Substances 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
- E02D29/05—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench
- E02D29/055—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench further excavation of the cross-section proceeding underneath an already installed part of the structure, e.g. the roof of a tunnel
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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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
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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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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/102—Removable shuttering; Bearing or supporting devices therefor
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Architecture (AREA)
- Environmental & Geological Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Foundations (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention discloses a prefabricated top plate and a cushion layer for cover and excavation construction and a construction method. Prefabricated plate body not only has the steel construction and improves the support performance as the roof of lid excavation construction, and the bottom of plate body has certain arch degree in advance simultaneously, and the attribute of similar bridge after the board body upside atress, with the board body atress homodisperse, offset the radian that the plate body leads to central authorities to warp downwards owing to the bearing, prevent the problem such as the fracture that the plate body bottom leads to owing to warping.
Description
Technical Field
The invention belongs to the technical field of subway engineering construction, and particularly relates to a prefabricated top plate and a prefabricated cushion layer for cover and excavation construction and a construction method.
Background
The cover-excavation construction is a novel engineering construction method which is adopted when underground engineering construction needs to pass through barriers such as roads, buildings and the like, the top part is sealed after the underground engineering construction is excavated to a certain depth from the ground, and the rest lower engineering construction is carried out under the sealed top cover. The main structure can be made in the same direction or in the opposite direction. The horizontal displacement to the structure is little, and factor of safety is high, and is little to the influence on ground, only locks ground traffic in the short time, and the construction is little by the influence of external weather.
The cover is excavated the construction and needs prefabricated roof as ground support, then excavate downwards at the roof and be under construction, and the in-process of prefabricated roof is excavated the certain degree of depth in ground earlier, then concreting cushion, and the bottom sprag when the cushion is used for pouring the roof, and the concrete material of cushion uses cement volume less, and structure density meets the end, and is more fragile, breaks after the roof of being convenient for is poured and is accomplished, remains the roof.
The existing prefabricated top plate is a horizontal supporting plate, has a concrete and steel bar framework structure, is not enough in strength and low in safety when used as a ground support, and particularly needs normal passing vehicles under the condition of road traffic. Therefore, the invention mainly prepares a top plate with pre-camber, and the problem of bottom cracking and deformation of the top plate can not occur when the top plate bears high-strength pressure.
Disclosure of Invention
The invention aims to provide a prefabricated top plate and a cushion layer for cover and excavation construction and a construction method.
In order to solve the technical problems, the invention is realized by the following technical scheme:
a prefabricated top plate for cover-excavation construction comprises a concrete plate body, wherein a wall body extending towards the ground layer is arranged on the side of the plate body and used for supporting the plate body, and the lower side of the plate body is provided with an arch with a certain pre-camber;
a steel structure is embedded in the plate body and comprises angle steel embedded at the corners of the plate body, the section of the angle steel is L-shaped, and the end points corresponding to the angle steel are fixed;
the steel construction is including the reinforcing bar of embedding surface course about the plate body, the reinforcing bar is a plurality of, and horizontal and longitudinal arrangement are latticed after horizontal and longitudinal reinforcing bar are arranged, the end fixing of reinforcing bar is in the angle steel that corresponds.
Furthermore, the end parts corresponding to the angle steels are provided with through holes, and after the end parts of the angle steels are aligned, the corresponding through holes are aligned and fixed through bolts.
Further, the angle steel of reinforcing bar tip, its avris is seted up the notch that holds the reinforcing bar tip, the notch is along angle steel avris align to grid.
The utility model provides a bed course for covering dig construction prefabricated roof, the bed course avris aligns with plate body bottom avris, the downside of bed course supports in the foundation ditch bottom, the upside of bed course is and is in advance degree of camber assorted arch with plate body bottom, the inside steelframe that has of bed course, the concrete placement who adopts the easy breakable to disassemble forms.
Further, the concrete for pouring the cushion layer comprises a foam concrete material with air holes, which is prepared by mixing cement, fly ash, fine sand, lime powder, aerated powder slag and a foaming agent; wherein the cement comprises the following components in parts by weight: 180 parts of 150-90 parts of fly ash, 120 parts of fine sand, 10-15 parts of lime powder, 30-50 parts of aerated powder slag and 1-2 parts of foaming agent.
Further, the steel frame comprises section steel embedded into two sides of the bottom of the cushion layer;
comprises a support frame embedded in the center of the cushion layer;
including a plurality of billet of embedding in the side arcuation face on the bed course, the billet is rectangular platelike, the central authorities of billet are fixed in the support frame, the end fixing of billet is in the shaped steel at both ends, the billet is along shaped steel length direction align to grid in proper order.
Furthermore, the section steel is L-shaped, comprises a transverse steel plate and a longitudinal steel plate, and is embedded into the bottom and the side of the cushion layer respectively, a detachable panel is installed on the upper side of the longitudinal steel plate, an interlayer is formed between the panel and the longitudinal steel plate in parallel, the end part of the steel bar is bent and then inserted into the interlayer, a bolt used for fixing the end part of the steel bar is installed on the interlayer, and a bolt hole for the bolt to pass through and be in threaded fit is formed in the position, corresponding to the bolt, of the transverse steel plate.
Furthermore, a clamping groove is formed in the side of the transverse steel plate, a stud is installed in the clamping groove, penetrates through the clamping groove and is inserted into a soil layer at the bottom of the foundation pit, and the stud is used for fixing the section steel.
Furthermore, the center of the steel bar is provided with a through hole, and the steel bar passes through the through hole through a screw and is fixed on the support frame.
A construction method for constructing a prefabricated roof by cover-excavation comprises the following steps,
(1) excavating a foundation pit: according to the area of the covering and excavating construction, firstly excavating a foundation pit corresponding to a covering and excavating construction point, and calculating the size of a top plate and the size of the bottom pre-camber;
(2) setting up a cushion layer: according to the pre-camber, steel frames in the cushion layer are built, when the steel frames are built, profile steel is fixed to the side of the foundation pit, then a support frame is fixed, the height of the support frame is adjusted according to the pre-camber, then the steel bars are sequentially installed, the centers of the steel bars are fixed to the support frame, then the two sides of the steel bars are bent downwards, and the steel bars are bent to the position of the profile steel for fixing;
(3) pouring a cushion layer: preparing a cushion layer concrete material, pouring the cushion layer concrete material on a steel frame, vibrating the cushion layer concrete material by a vibrating bar to uniformly permeate the cushion layer concrete material, then hanging redundant concrete material along the radian of the steel bar by a batten or a scraper to form an upwards arc-shaped arched cushion layer, and standing the cushion layer concrete for drying and forming;
(4) pouring a top plate: after the cushion layer is dried, laying a layer of geomembrane on the surface, then, pouring a top plate, prefabricating a steel structure, reserving a wall body at the side of the top plate, configuring concrete for pouring the top plate, firstly installing the steel structure, then pouring the concrete, uniformly mixing through vibration of a vibrating rod, and standing the concrete with the top plate for solidification and forming;
(5) and (3) cushion layer breaking: after the roof drying and forming, the bottom cushion layer is broken, the excavation manhole enters the roof, the steel frame is recovered through the broken cushion layer of the hammering mode, and the roof is prefabricated.
The invention has the following beneficial effects:
prefabricated plate body not only has the steel construction and improves the support performance as the roof of lid excavation construction, and the bottom of plate body has certain arch degree in advance simultaneously, and the attribute of similar bridge after the board body upside atress, with the board body atress homodisperse, offset the radian that the plate body leads to central authorities to warp downwards owing to the bearing, prevent the problem such as the fracture that the plate body bottom leads to owing to warping.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used for describing the embodiments are briefly introduced below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1: the roof of the invention has a cut structure diagram.
FIG. 2: the invention relates to a structure diagram of a steel structure.
FIG. 3: the invention relates to a structure diagram of the matching of a plate body and a cushion layer.
FIG. 4: the cushion layer of the invention has a cut structure diagram.
FIG. 5 is a schematic view of: the invention relates to a structure diagram of a steel frame.
FIG. 6: the invention relates to a steel frame and a locally enlarged structural diagram.
FIG. 7: the invention relates to a steel frame and a locally enlarged structural diagram.
In the drawings, the components represented by the respective reference numerals are listed below:
plate body 1, wall body 11, steel structure 2, angle steel 21, reinforcing steel 23, notch 22, bed course 3, steelframe 4, shaped steel 41, support frame 42, billet 43, paneling 44, intermediate layer 45, draw-in groove 46, tack 47.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the embodiments are only a part of the embodiments of the present invention, but not all of the embodiments.
In the present invention, it is to be understood that: the terms "opening," "upper," "lower," "thickness," "top," "center," "length," "inner," "peripheral," and the like are used herein for the purpose of describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced components must be in a particular orientation.
As shown in fig. 1-3: a prefabricated roof for cover-and-excavation construction comprises a concrete plate body 1 which is rectangular, the thickness of the plate body is 30-40cm, and the size of the plate body is determined according to the actual cover-and-excavation construction point of a subway station. The side of the plate body 1 is provided with a wall body 11 extending towards the ground layer, the wall body is used for supporting the side of the plate body, the wall body is formed by pouring concrete and used for supporting the plate body, and the lower side of the plate body 1 is in an arch shape with a certain pre-camber; and calculating the pre-camber according to the size of the top plate to obtain the optimal pre-camber requirement.
A steel structure 2 is embedded into the plate body 1, the steel structure 2 comprises angle steel 21 embedded at the corners of the plate body 1, the section of the angle steel 21 is L-shaped, and the corresponding end points of the angle steel 21 are fixed; the plate body is in a cuboid shape, twelve corresponding corners are provided, twelve corresponding angle steels are provided, the length of each angle steel is different, and end points are fixed to form a frame structure.
The steel construction 2 is including embedding the reinforcing bar 23 of surface course about the plate body 1, reinforcing bar 23 is a plurality of, and horizontal and longitudinal arrangement are latticed after horizontal and longitudinal reinforcement 23 arranges, the end fixing of reinforcing bar 23 is in corresponding angle steel 21. The cross points of the transverse steel bars and the longitudinal steel bars can be bundled by binding wires, and the steel structure is used for improving the support strength of the plate body.
According to the invention, the prefabricated plate body is used as a top plate for cover-excavation construction, so that the support performance of a steel structure is improved, meanwhile, the bottom of the plate body has a certain pre-camber similar to the property of a bridge, and after the upper side of the plate body is stressed, the stress of the plate body is uniformly dispersed, the radian of the plate body caused by load bearing and downward deformation of the center is offset, and the problems of cracking and the like caused by deformation of the bottom of the plate body are prevented.
As shown in fig. 2: the corresponding end parts of the angle steels 21 are provided with through holes, and after the end parts of the angle steels are aligned, the corresponding through holes are aligned and fixed through bolts. The accurate installation of the angle steel of being convenient for avoids the welding, is convenient for temporarily adjust.
As shown in fig. 2: the angle steel 21 of 23 tip of reinforcing bar, notch 22 that holds 23 tips of reinforcing bar is seted up to its avris, notch 22 is followed angle steel 21 avris align to grid. The steel structures at all positions corresponding to the plate body are uniform, and the strength of the plate body is improved.
As shown in fig. 3-5: 3 avris in bed course aligns with 1 bottom avris of plate body, the downside of bed course 3 supports in the foundation ditch bottom, the upside of bed course 3 is with 1 bottom of plate body camber assorted arch in advance, 3 inside steelframes 4 that have in bed course, the concrete placement who adopts the fragile disassembling forms. The thickness of bed course is about 15cm, contains the sand content height in the concrete, and the texture is softer for form the one deck bed course in the bottom of plate body, then pour the concrete that the plate body was used, treat the upper plate body concrete solidification back, break the bed course of bottom, the arch at bed course top is used for forming the arch degree in advance of plate body bottom.
The concrete for pouring the cushion layer 3 comprises a foam concrete material with air holes, which is prepared by mixing cement, fly ash, fine sand, lime powder, aerated powder slag and a foaming agent; wherein the cement comprises the following components in parts by weight: 180 parts of 150-90 parts of fly ash, 120 parts of fine sand, 10-15 parts of lime powder, 30-50 parts of aerated powder slag and 1-2 parts of foaming agent. The cement is 32.5 grade or 42.5 grade of common portland cement. The foaming agent is a special foaming agent for YX series foaming bricks, and is specifically one of MNC-FP or SDS. The support is characterized by having certain support performance, soft texture and easy breaking.
As shown in fig. 6: the steel frame 4 comprises section steel 41 embedded in two sides of the bottom of the cushion layer 3;
including a support bracket 42 embedded in the center of the mat;
including a plurality of billet 43 of embedding side arc face on bed course 4, billet 43 is rectangular platelike, the central authorities of billet 43 are fixed in support frame 42, the end fixing of billet 43 is in the shaped steel 41 at both ends, billet 43 is along the length direction of shaped steel align to grid in proper order. Wherein the support frame is made for wooden, disposable, can be according to the crooked radian demand adjustment height of billet, the billet is thinner, certain bending capacity has, the crooked radian of billet is the radian of bed course upside hunch-up, the bed course is installing the steelframe before pouring, then concreting, scrape the unnecessary concrete of brush bed course upside through stuff or chi, scrape the brush along the billet radian when scraping the brush, be used for forming certain camber at the upside of bed course, the camber is for calculating in advance and reachs, then change the height of support frame, make the billet reach certain crooked mesh. The cushion prepared by the method can not only manufacture the cushion with regular shape, but also adjust the height of the supporting frame according to the requirement and change the size of the camber.
As shown in fig. 6: the section steel 41 cross-section is L shape, including horizontal steel sheet and vertical steel sheet, imbed respectively with the bottom and the avris of bed course 4, detachable paneling 44 is installed to the upside of vertical steel sheet, paneling 44 is parallel and between vertical steel sheet and form intermediate layer 45, insert intermediate layer 45 after the tip of billet 43 buckles, intermediate layer 45 is installed and is used for the bolt of fixed billet tip, the bolt hole that supplies the bolt to pass and screw-thread fit is seted up to the position that horizontal steel sheet corresponds the bolt. This bolt hole is the tapping screw hole, is located the intermediate layer unilateral, has vertical hem after the billet tip is buckled, vertical insert intermediate layer, rotatory corresponding bolt and extrusion billet tip make it fixed. Shaped steel and billet all repeatedly usable, when the bed course is abolished, can retrieve the steelframe, the paneling is straight strip steel sheet, demountable installation for clear away the concrete in the intermediate layer when retrieving.
As shown in fig. 7: the lateral sides of the transverse steel plates are provided with clamping grooves 46, studs 47 are installed in the clamping grooves 46, the studs 47 penetrate through the clamping grooves 46 and are inserted into soil layers at the bottom of the foundation pit, and the studs are used for fixing the section steel 41. The pin has tip clamp plate and toper nail portion, and fixed shaped steel prevents that the billet from kick-backing under the toughness, drags shaped steel and takes place the displacement.
As shown in fig. 6: the steel bar 43 has a through hole at the center thereof, and is fixed to the support bracket 42 by passing through the through hole with a screw. For fixing the center of the steel bar.
The construction method for constructing the prefabricated roof by cover-excavation comprises the following steps,
(1) excavating a foundation pit: according to the area of the cover-excavation construction, firstly excavating a foundation pit corresponding to a cover-excavation construction point, and calculating the size of a top plate and the size of the pre-camber of the bottom;
(2) setting up a cushion layer: building a steel frame in the cushion layer according to the pre-camber, fixing profile steel on the side of the foundation pit when building the steel frame, fixing a support frame, adjusting the height of the support frame according to the pre-camber, sequentially installing steel bars, fixing the center of each steel bar on the support frame, bending two sides of each steel bar downwards, and fixing the steel bars when bending the two sides of each steel bar to the position of the profile steel;
(3) pouring a cushion layer: preparing a cushion layer concrete material, pouring the cushion layer concrete material on a steel frame, vibrating the cushion layer concrete material by a vibrating bar to uniformly permeate the cushion layer concrete material, then hanging redundant concrete material along the radian of the steel bar by a batten or a scraper to form an upwards arc-shaped arched cushion layer, and standing the cushion layer concrete for drying and forming;
(4) pouring a top plate: after the cushion layer is dried, laying a layer of geomembrane on the surface, then, pouring a top plate, prefabricating a steel structure, reserving a wall body at the side of the top plate, configuring concrete for pouring the top plate, firstly, installing the steel structure, then pouring the concrete, uniformly mixing through vibration of a vibrating rod, and standing the concrete with the top plate for solidification and molding;
(5) breaking a cushion layer: after the roof drying and forming, the bottom cushion layer is broken, the excavation manhole enters the roof, the steel frame is recovered through the broken cushion layer of the hammering mode, and the roof is prefabricated.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not exhaustive. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand the invention for and utilize the invention.
Claims (10)
1. The utility model provides a lid digs prefabricated roof of construction which characterized in that:
the concrete slab comprises a concrete slab body (1), wherein a wall body (11) extending towards the ground is arranged on the side of the slab body (1) and used for supporting the slab body, and the lower side of the slab body (1) is arched with a certain pre-camber;
a steel structure (2) is embedded into the plate body (1), the steel structure (2) comprises angle steel (21) embedded into corners of the plate body (1), the section of the angle steel (21) is L-shaped, and end points corresponding to the angle steel (21) are fixed;
steel construction (2) are including embedding reinforcing bar (23) of surface course about plate body (1), reinforcing bar (23) are a plurality of, transversely and longitudinal arrangement, are latticedly after transversely arranging with longitudinal reinforcement (23), the end fixing of reinforcing bar (23) is in angle steel (21) that correspond.
2. The cover and dig construction prefabricated roof of claim 1, characterized in that: the end parts of the angle steels (21) corresponding to the through holes are provided with through holes, and after the end parts of the angle steels are aligned, the corresponding through holes are aligned and fixed through bolts.
3. The cover and cut construction prefabricated roof panel according to claim 1 or 2, characterized in that: angle steel (21) of reinforcing bar (23) tip, notch (22) that hold reinforcing bar (23) tip are seted up to its avris, angle steel (21) avris align to grid is followed in notch (22).
4. A cushion layer for the cover-excavation construction prefabricated roof panel of claim 1, characterized in that: bed course (3) avris aligns with plate body (1) bottom avris, the downside of bed course (3) is supported in the foundation ditch bottom, the upside of bed course (3) is the arch with plate body (1) bottom pre-arching degree assorted, bed course (3) inside has steelframe (4), adopts the concrete placement of easy broken disassembling to form.
5. The pad layer of the cover and cut construction prefabricated roof as claimed in claim 4, wherein: the concrete for pouring the cushion layer (3) comprises a foam concrete material with air holes, which is prepared by mixing cement, fly ash, fine sand, lime powder, aerated powder slag and a foaming agent; wherein, the cement comprises the following components in parts by weight: 180 parts of 150-90 parts of fly ash, 120 parts of fine sand, 10-15 parts of lime powder, 30-50 parts of aerated powder slag and 1-2 parts of foaming agent.
6. The pad layer of the cover and cut construction prefabricated roof as claimed in claim 4, wherein: the steel frame (4) comprises section steel (41) embedded into two sides of the bottom of the cushion layer (3);
comprises a support frame (42) embedded in the center of the cushion layer;
including a plurality of billet (43) of embedding side arc face on bed course (4), billet (43) are rectangular platelike, support frame (42) are fixed in to the central authorities of billet (43), the end fixing of billet (43) is in the shaped steel (41) at both ends, billet (43) are along shaped steel length direction align to grid in proper order.
7. The blanket of a cover and dig construction precast roof panel of claim 6, which is characterized in that: shaped steel (41) cross-section is L shape, including horizontal steel sheet and vertical steel sheet, imbeds respectively with the bottom and the avris of bed course (4), detachable paneling (44) are installed to the upside of vertical steel sheet, paneling (44) and vertical steel sheet are parallel and between form intermediate layer (45), insert intermediate layer (45) after buckling of the tip of billet (43), the bolt that is used for fixed billet tip is installed in intermediate layer (45), the bolt hole that supplies the bolt to pass and screw-thread fit is seted up to the position that horizontal steel sheet corresponds the bolt.
8. The pad layer of the cover and cut construction prefabricated roof as claimed in claim 7, wherein: the lateral side of the transverse steel plate is provided with a clamping groove (46), a tack (47) is installed in the clamping groove (46), and the tack (47) penetrates through the clamping groove (46) and is inserted into a soil layer at the bottom of the foundation pit and used for fixing the section steel (41).
9. The blanket of the cover and cut construction precast roof panel as set forth in claim 6 or 7, wherein: the center of the steel bar (43) is provided with a through hole, and the steel bar is fixed on the support frame (42) through the through hole by a screw.
10. A construction method of the cover-excavation construction of the prefabricated roof panel as claimed in claim 1, characterized in that: comprises the following steps of (a) carrying out,
(1) excavating a foundation pit: according to the area of the covering and excavating construction, firstly excavating a foundation pit corresponding to a covering and excavating construction point, and calculating the size of a top plate and the size of the bottom pre-camber;
(2) setting up a cushion layer: building a steel frame in the cushion layer according to the pre-camber, fixing profile steel on the side of the foundation pit when building the steel frame, fixing a support frame, adjusting the height of the support frame according to the pre-camber, sequentially installing steel bars, fixing the center of each steel bar on the support frame, bending two sides of each steel bar downwards, and fixing the steel bars when bending the two sides of each steel bar to the position of the profile steel;
(3) pouring a cushion layer: preparing a cushion layer concrete material, pouring the cushion layer concrete material on a steel frame, vibrating the cushion layer concrete material by a vibrating bar to uniformly permeate the cushion layer concrete material, then hanging redundant concrete material along the radian of the steel bar by a batten or a scraper to form an upwards arc-shaped arched cushion layer, and standing the cushion layer concrete for drying and forming;
(4) pouring a top plate: after the cushion layer is dried, laying a layer of geomembrane on the surface, then, pouring a top plate, prefabricating a steel structure, reserving a wall body at the side of the top plate, configuring concrete for pouring the top plate, firstly installing the steel structure, then pouring the concrete, uniformly mixing through vibration of a vibrating rod, and standing the concrete with the top plate for solidification and forming;
(5) and (3) cushion layer breaking: after the roof drying and forming, the bottom cushion layer is broken, the excavation manhole enters the roof, the steel frame is recovered through the broken cushion layer of the hammering mode, and the roof is prefabricated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| JP2015117545A (en) * | 2013-12-19 | 2015-06-25 | 鹿島建設株式会社 | Construction method for underground tunnel |
| CN109838240A (en) * | 2019-03-14 | 2019-06-04 | 中铁十八局集团有限公司 | Cross the river tunnel ledge cover and cut construction method |
| CN110512647A (en) * | 2019-08-28 | 2019-11-29 | 北京工业大学 | A kind of partial assembled formula Metro Station Structure design and construction method |
| CN111485490A (en) * | 2020-04-09 | 2020-08-04 | 苏交科集团股份有限公司 | Wide prefabricated bridge deck and construction method thereof |
| CN212452334U (en) * | 2020-01-14 | 2021-02-02 | 王艳芳 | Arch structure for culvert and reinforced concrete arch plate thereof |
| CN112392070A (en) * | 2020-11-23 | 2021-02-23 | 北京城建设计发展集团股份有限公司 | Rail transit open cut method underground station major structure does not have post atress structure |
| CN112681374A (en) * | 2020-12-21 | 2021-04-20 | 武汉市市政工程机械化施工有限公司 | Shallow-buried underground-excavated channel cover excavation top-down construction method under complex conditions |
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| JP2015117545A (en) * | 2013-12-19 | 2015-06-25 | 鹿島建設株式会社 | Construction method for underground tunnel |
| CN109838240A (en) * | 2019-03-14 | 2019-06-04 | 中铁十八局集团有限公司 | Cross the river tunnel ledge cover and cut construction method |
| CN110512647A (en) * | 2019-08-28 | 2019-11-29 | 北京工业大学 | A kind of partial assembled formula Metro Station Structure design and construction method |
| CN212452334U (en) * | 2020-01-14 | 2021-02-02 | 王艳芳 | Arch structure for culvert and reinforced concrete arch plate thereof |
| CN111485490A (en) * | 2020-04-09 | 2020-08-04 | 苏交科集团股份有限公司 | Wide prefabricated bridge deck and construction method thereof |
| CN112392070A (en) * | 2020-11-23 | 2021-02-23 | 北京城建设计发展集团股份有限公司 | Rail transit open cut method underground station major structure does not have post atress structure |
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