CN109629576B - Suspension protection system for water supply pipe crossing foundation pit and construction method - Google Patents
Suspension protection system for water supply pipe crossing foundation pit and construction method Download PDFInfo
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- CN109629576B CN109629576B CN201811646332.1A CN201811646332A CN109629576B CN 109629576 B CN109629576 B CN 109629576B CN 201811646332 A CN201811646332 A CN 201811646332A CN 109629576 B CN109629576 B CN 109629576B
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- water supply
- supply pipe
- foundation pit
- suspension
- pipe
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L3/00—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets
- F16L3/02—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets partly surrounding the pipes, cables or protective tubing
- F16L3/04—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets partly surrounding the pipes, cables or protective tubing and pressing it against a wall or other support
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
Abstract
The invention relates to a suspension protection system for a water supply pipe traversing a foundation pit and a construction method, and is characterized by comprising the following steps: a water supply pipe area foundation pit excavation auxiliary sizing device; a pile-beam integrated suspension support beam placing system; a water supply pipe unit assembled suspension protection system crossing the foundation pit; the rigid cast-in-place concrete base and the light roof covering backfill system cross the water supply pipe of the foundation pit. The invention belongs to the field of underground engineering, effectively protects the integrity of a water supply pipe crossing a foundation pit, improves the construction safety, solves the problem of the overall stability of a suspension support structure consisting of a support pile and a reinforced concrete lintel, obviously improves the construction efficiency, and has simple and easy construction process. Can obtain better technical and economic benefits when applied to actual engineering.
Description
Technical Field
The invention relates to the technical field of underground water supply pipe protection engineering, in particular to a suspension protection system for a water supply pipe crossing a foundation pit and a construction method.
Background
With the continuous promotion of the comprehensive national power of China, the basic traffic facilities of various cities in China are changed day by day, and particularly, subway projects are constructed without continuous operation. The subway engineering is basically located city main road below, easily influences each other with existing municipal pipeline, especially in the course of open cut foundation ditch construction, and this condition is especially outstanding. If necessary measures are not taken for the pipeline before construction, a large damage risk exists in the construction process, the construction is influenced slightly, communication interruption, traffic jam, water cut, power cut, gas cut and the like are caused seriously to influence the normal life of urban residents, and even social public safety accidents are possibly caused to threaten the life safety. At present, generally adopted measures are protection and relocation, various pipelines can be relocated under general conditions, but some pipelines cannot be relocated and span above a foundation pit, and construction difficulty is inevitably increased for construction.
The prior art has a construction technology for hanging and protecting a water supply pipe crossing a foundation pit by a universal rod piece, which is characterized in that a double-layer universal rod piece is erected along the direction of a pipeline to be used as a hanging beam, and hanging and protecting are carried out in a sling mode. The technology is suitable for the conditions of large pipeline diameter and large foundation pit width. In the prior art, a large-span suspension protection technology for underground pipelines is also provided, which is characterized in that a scheme of suspension protection after a temporary stand column is arranged in a foundation pit is adopted for natural gas and water supply pipelines which transversely penetrate through the foundation pit before the foundation pit is excavated. Namely, two ends of the pipeline are erected on the top beams of the enclosure piles on two sides of the foundation pit, and the middle part of the pipeline is erected on a temporary upright post additionally arranged in the foundation pit. The existing construction easily causes pipeline damage and low construction efficiency in the excavation process near the pipeline, and the problems that the integrity and the stability of connection of the lintel and the supporting pile are poor, and the water supply pipe is easily damaged in the backfill process of the water supply pipe crossing the foundation pit are solved. And the adoption of a suspension protection system of a water supply pipe crossing the foundation pit and a construction method is an effective measure for solving the problem.
Disclosure of Invention
The invention aims to provide a suspension protection system for a water supply pipe traversing a foundation pit and a construction method thereof, aiming at solving the problems in suspension protection construction for the water supply pipe traversing the foundation pit.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the suspension protection system for the water supply pipe traversing the foundation pit is characterized by comprising a suspension support beam placing structure, a suspension structure for the water supply pipe traversing the foundation pit and a backfill structure for the water supply pipe traversing the foundation pit;
the suspension support beam placing structure comprises a support pile, a reinforced concrete lintel template system and a pile-beam integrated suspension support beam placing system;
the suspension structure for the water supply pipe crossing the foundation pit comprises a unit type top cross beam frame structure, a unit type bottom cross beam frame structure, a suspender and a unit assembling type suspension protection system for the water supply pipe crossing the foundation pit;
the backfill structure for the water supply pipe crossing the foundation pit comprises a water supply pipe, backfill soil at the bottom of the pipe, a formwork system of a base of the water supply pipe crossing the foundation pit, a cast-in-place concrete base, a top-covering backfill formwork system of the water supply pipe crossing the foundation pit, a top-covering aerated concrete of the pipe top, backfill soil at the pipe top and a ground restoration structure.
The suspension protection system for the water supply pipe traversing the foundation pit is characterized in that the support pile comprises a support pile steel bar, a support pile stirrup and poured concrete; the reinforced concrete lintel comprises lintel steel bars, lintel stirrups and poured concrete;
the suspension protection system for the water supply pipe crossing the foundation pit is characterized in that the reinforced concrete lintel template system comprises an embedded expanding template and a bracing type lintel template, wherein the embedded expanding template is installed on two sides of the reinforced concrete lintel and then a wrapping expanding section is cast, the embedded expanding template is not detached after being supported by the formwork, and the bracing type lintel template is installed on the bottom and two sides of the reinforced concrete lintel.
The suspension protection system for the water supply pipe crossing the foundation pit is characterized in that the suspension support beam placing system with the integrated pile beam comprises a reinforcement cage with the integrated pile beam and a reinforcement plate with the integrated pile beam, and the joint of the upper part of the support pile and the two sides of the reinforced concrete lintel is provided with the reinforcement cage with the integrated pile beam and the reinforcement plate with the integrated pile beam.
The water supply pipe suspension protection system crossing the foundation pit is characterized in that the unit type top cross beam frame structure comprises an integrally pre-embedded combined bolt group, a suspender, a unit type top cross beam frame and a top cross beam frame adjusting bolt, wherein the integrally pre-embedded combined bolt group is connected with the unit type top cross beam frame which is connected with the suspender, and the suspender and the unit type top cross beam frame adjust the levelness of the suspension protection pipe through the top cross beam frame adjusting bolt; the unit type bottom beam frame structure comprises a main suspension bearing beam, a bottom beam frame through long connecting piece and a secondary suspension bearing beam, wherein the bottom beam frame through long connecting piece is connected with the main suspension bearing beam and the secondary suspension bearing beam, the main suspension bearing beam is connected with a suspension rod, and a suspension rod reinforcing connecting rod is arranged in the middle of the suspension rod.
The cross foundation pit feed pipe suspension protection system is characterized in that the cross foundation pit feed pipe unit assembling type suspension protection system comprises a bottom cross beam frame arc support and a flexible buffer cushion, wherein the flexible buffer cushion is arranged outside the feed pipe, the bottom cross beam frame arc support is arranged outside the flexible buffer cushion, and a unit type bottom cross beam frame structure is arranged below the bottom cross beam frame arc support.
The suspension protection system for the water supply pipe traversing the foundation pit is characterized in that the support mold system for the base of the water supply pipe traversing the foundation pit comprises a separated base sizing side mold, a base side mold fixing suspender, a base side mold ring pipe fixing belt and a base side mold counter-pulling part, wherein two sides of the separated base sizing side mold are connected through the base side mold counter-pulling part, the separated base sizing side mold is fixed by arranging the base side mold fixing suspender, and the periphery of the water supply pipe is provided with the base side mold ring pipe fixing belt; it covers a backfill formwork system to cross foundation ditch feed pipe, including covering top side mould jib, covering top side mould split lug plate, bubble concrete and covering top side mould split piece, cover top side mould jib hoist and mount bubble concrete side mould, bubble concrete covers top side mould and utilizes to cover top side mould split lug plate, cover top side mould split piece and cover top side mould jib fixed.
The construction method of the suspension protection system for the water supply pipe crossing the foundation pit is characterized by comprising the following steps of:
step one, detecting a water supply pipe crossing a foundation pit: detecting by using a pipeline detector according to the placed point position;
step two, excavating a soil body: after the position of the water supply pipe is determined, a trench is excavated by using an excavator, a foundation pit soil body is excavated by using a shaped bucket, the soil body is excavated by using a shaped cutting excavator at the bottom of the pipe close to the water supply pipe, and a water supply pipe protection system is arranged;
step three, excavation and support of a foundation pit on the water supply pipe: excavating the foundation pit layer by layer, reinforcing the side slope, and timely constructing a support;
fourthly, constructing a pile-beam integrated suspension support beam shelving system: and constructing support piles at two sides of the foundation pit along the direction of the water supply pipe, wherein the support piles are connected and combined into a pile-beam integrated suspension support beam shelving system through reinforced concrete lintels, and the joints of the support piles and the reinforced concrete lintels are provided with pile-beam integrated reinforcement cage reinforcing pile beam connections.
Step five, constructing a unit assembly type suspension protection system of a water supply pipe traversing the foundation pit: flexible cushion pads are arranged at intervals outside the water supply pipe, a bottom cross beam frame arc support is arranged at the corresponding lower end, and the bottom cross beam frame arc support is supported by a suspension protection system consisting of a unit type bottom cross beam frame structure, a unit type top cross beam frame structure and a reinforced concrete lintel which are correspondingly arranged;
step six, excavation and support of a foundation pit under the water supply pipe: excavating the foundation pit under the water supply pipe after the suspension protection system is stabilized, wherein the excavation is carried out from two ends to the middle part in a layered mode, and construction monitoring is enhanced;
seventhly, main structure and waterproof construction: after excavation supporting construction is carried out to the bottom of the foundation pit, a main structure of the interval and water resistance are gradually constructed;
step eight, backfilling at the bottom of the foundation pit: after the main structure and the waterproof construction are finished, backfilling earthwork of a foundation pit, and backfilling the earthwork below a water supply pipe to a position of 1.0m of the bottom of the pipe;
ninth, water supply pipe base formwork support and pouring construction: the base side die adopts a separated base regularized side die, and the base formwork support is realized through a base side die fixing suspender, a base side die ring pipe fixing band, a base side die counter-pulling vertical plate and a base side die counter-pulling part; after the formwork is erected and the inspection is qualified, pouring a feed pipe cast-in-place concrete base;
step ten, maintaining and removing the mold: after the concrete reaches the specified strength, the fixed suspender of the side form of the base is dismantled;
step eleven, top-covering backfill formwork support and pouring construction of the water supply pipe: removing the cast-in-place concrete base template, performing top-covering backfill formwork supporting construction, realizing top-covering formwork supporting of the bubble concrete through a top-covering formwork hanging rod, a top-covering formwork counter-pulling lug plate and a top-covering formwork counter-pulling piece, and pouring the top-covering bubble concrete after the formwork supporting is finished and the inspection is qualified;
step twelve, maintenance and form removal: after the bubble concrete reaches the specified strength, removing the top-covered side mold of the bubble concrete;
seventhly, backfilling the top of the water supply pipe and recovering the ground structure construction: and after the top side mould of the aerated concrete is detached, checking that the aerated concrete at the top of the pipe has no construction problem, backfilling the top of the water supply pipe and finally recovering the ground structure.
The construction method of the suspension protection system for the water supply pipe crossing the foundation pit is characterized in that in the step 2): the excavator is provided with an excavator bucket rod and a movable arm, the movable arm is connected with a shaped excavator bucket or a pipe bottom shaped cutting excavator, and the shaped excavator bucket is positioned on a toothed plate through a positioning bucket tooth and a bucket tooth limiting horizontal plate and then is connected with a separated type excavating bucket tooth and a bucket tooth bottom plate through a quick connecting piece; the pipe bottom shaping cutting excavator; the pipe bottom shaping cutting excavator is positioned by the bucket fixing plate and then is connected with the bucket rod of the excavator.
The construction method of the suspension protection system for the water supply pipe traversing the foundation pit is characterized in that the water supply pipe excavation protection system in the step 2) comprises a rubber pad and a buffer layer, and the water supply pipe is protected by arranging the rubber pad and the buffer layer.
The invention has the beneficial effects that:
(1) the invention adopts the auxiliary sizing device for excavation of the foundation pit in the water supply pipe area and the sizing cutting and excavating device in the area around the water supply pipe, thereby realizing rapid and effective excavation of the soil body around the water supply pipe and being beneficial to ensuring the safety of the water supply pipe.
(2) According to the invention, the rubber pad and the buffer layer are respectively arranged on the outer side of the water supply pipe, so that the integrity of the water supply pipe is effectively protected, and the water supply pipe is prevented from being damaged due to excavation of the excavator.
(3) The invention adopts the pile-beam integrated suspension support beam placing system, greatly improves the overall stability and safety of the suspension support structure consisting of the support piles and the reinforced concrete lintel, and effectively ensures the smooth completion of the support suspension construction.
(4) According to the invention, post-cast wrapping expanding sections are added on two sides of the reinforced concrete lintel and an embedded expanding template is adopted, so that the connection integrity of the pile beam is obviously improved.
(5) According to the invention, the flexible cushion pad is arranged under the water supply pipe in a cushioning manner, and the bottom cross beam frame arc support is arranged under the flexible cushion pad, so that the integrity of the water supply pipe is effectively ensured.
(6) The invention adopts a suspended ceiling system with a suspension protection pipe, connects the suspender through the integrally pre-embedded combined bolt group, and adjusts the height of the suspender by utilizing the cross beam adjusting bolt, thereby effectively ensuring the levelness and the safety of the suspended water supply pipe.
(7) The invention adopts the assembled suspension protection system of the water supply pipe unit crossing the foundation pit, the bottom cross beam frame is additionally provided with the through long connecting piece of the bottom cross beam frame, and the reinforcing connecting rod is additionally arranged in the middle of the suspender, thereby greatly improving the stability and the safety of the suspension system.
(8) The formwork supporting method adopts the rigid cast-in-place concrete base which traverses through the foundation pit water supply pipe, and the formwork supporting which traverses through the foundation pit water supply pipe base is realized through the hanging rod and the counter-pulling piece, so that the formwork supporting efficiency of the formwork is effectively improved, and the stability of the rigid cast-in-place concrete base is good.
(9) The lightweight top-covering backfill system for the water supply pipe traversing the foundation pit is adopted, the load bearing degree of the water supply pipe is reduced, the lightweight top-covering backfill support formwork is realized through the suspension rod, the counter-pulling lug plate and the side formwork counter-pulling part, the construction speed is high, and the construction efficiency is obviously improved.
Drawings
Figure 1 is a plan view of a shovel;
FIG. 2 is a schematic view of a shaped cutter;
FIG. 3 is a schematic view of a bucket tooth attachment configuration for a excavator;
FIG. 4 is a schematic view of a protective layer excavated from a water supply pipe;
FIG. 5 is a schematic view of a suspension protection structure of a water supply pipe traversing a foundation pit;
FIG. 6 is a cross-sectional view of the suspension protection of the service pipe across the foundation pit;
FIG. 7 is a schematic view of a unitary top cross-beam structure;
FIG. 8 is a schematic view of a unitary bottom rail;
FIG. 9 is a schematic structural diagram of a formwork supporting system for a water supply pipe base traversing a foundation pit;
FIG. 10 is a schematic structural diagram of a topping backfill formwork system traversing a foundation pit water supply pipe;
FIG. 11 is a schematic diagram of a backfill structure of a water supply pipe crossing a foundation pit;
in the figure: 1-excavator, 2-excavator bucket rod, 3-excavator bucket fixing plate, 4-quick connecting piece, 5-shaped excavator bucket, 6-bucket tooth limiting horizontal plate, 7-separated excavation bucket tooth, 8-positioning bucket tooth, 9-bucket tooth bottom plate, 10-rubber pad, 11-buffer layer, 12-tube bottom shaping cutter, 13-supporting pile, 14-supporting pile reinforcing steel bar, 15-post-cast wrapping expanding section, 16-embedded expanding template, 17-pulling-supported lintel template, 18-reinforced concrete lintel, 19-pile-beam integrated reinforcement cage, 20-pile-beam reinforcing rib plate, 21-integral embedded combination bolt group, 22-water supply pipe, 23-movable arm, 24-toothed plate, 25-top-side-covered mold suspender, 26-suspended main bearing beam, 27-unit type bottom cross beam frame, 28-bottom cross beam frame arc support, 29-flexible buffer cushion, 30-suspender, 31-suspender reinforced connecting rod, 32-bottom cross beam frame through long connecting piece, 33-unit type top cross beam frame, 34-top cross beam frame adjusting bolt, 35-tube bottom backfill, 36-cast-in-place concrete base, 37-tube top bubble concrete topping, 38-tube top backfill, 39-restoration ground structure, 40-separated type base shaping side mould, 41-base side mould fixing suspender, 42-base side mould ring pipe fixing band, 43-base side mould counter-pulling vertical plate, 44-base side mould counter-pulling piece, 45-covering top side mould counter-pulling lug plate, 46-bubble concrete covering top side mould, 47-covering top side mould counter-pulling piece and 48-supporting pile rib, 49-lintel steel bars, 50-lintel stirrups, 51-poured concrete, and 52-suspended secondary bolster.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1-11, the suspension protection system for the water supply pipe crossing the foundation pit comprises a suspension support beam resting structure, a suspension structure for the water supply pipe crossing the foundation pit and a backfill structure for the water supply pipe crossing the foundation pit.
The suspension support beam laying structure comprises a support pile 13, a reinforced concrete lintel 18, a reinforced concrete lintel template system and a pile-beam integrated suspension support beam laying system;
the support pile 13 comprises support pile reinforcing steel bars 14, support pile stirrups 48 and poured concrete 51; the reinforced concrete lintel 18 comprises lintel steel bars 49, lintel stirrups 50 and poured concrete 51;
the reinforced concrete lintel template system comprises embedded expanding templates 16 and bracing type lintel templates 17, wherein the embedded expanding templates 16 are installed on two sides of the reinforced concrete lintel 18, then the embedded expanding templates 16 are poured to wrap the expanding sections 15, the embedded expanding templates 16 are not detached after being supported, and the bracing type lintel templates 17 are installed on the bottom and two sides of the reinforced concrete lintel 18.
Pile-beam integrated suspension supporting beam shelving system comprises a pile-beam integrated reinforcement cage 19 and pile-beam reinforcing rib plates 20, wherein pile-beam integrated reinforcement cages 19 and pile-beam reinforcing rib plates 20 are arranged at the joint of the upper part of a supporting pile 13 and the two sides of a reinforced concrete lintel 18.
The suspension structure crossing the water supply pipe of the foundation pit comprises a unit type top cross beam frame structure, a unit type bottom cross beam frame structure, a suspender 30 and a unit assembling type suspension protection system crossing the water supply pipe of the foundation pit;
the unit type top cross beam frame structure comprises an integral pre-buried combination bolt group 21, a suspender 30, a unit type top cross beam frame 33 and a top cross beam frame adjusting bolt 34, wherein the integral pre-buried combination bolt group 21 is connected with the unit type top cross beam frame 33, the unit type top cross beam frame 33 is connected with the suspender 30, and the levelness of a suspension protection pipe of the suspender 30 and the unit type top cross beam frame 33 is adjusted through the top cross beam frame adjusting bolt 34; the unit type bottom beam frame structure comprises a main suspension bearing beam 26, a bottom beam frame through long connecting piece 32 and a secondary suspension bearing beam 52, wherein the bottom beam frame through long connecting piece 32 is connected with the main suspension bearing beam 26 and the secondary suspension bearing beam 52, the main suspension bearing beam 26 is connected with a suspension rod 30, and a suspension rod reinforcing connecting rod 31 is arranged in the middle of the suspension rod 30.
The unit assembling type suspension protection system for the water supply pipe crossing the foundation pit comprises a water supply pipe 22, a unit type bottom cross beam frame 27, a bottom cross beam frame arc support 28 and a flexible buffer cushion 29, wherein the flexible buffer cushion 29 is arranged outside the water supply pipe 22, the bottom cross beam frame arc support 28 is arranged outside the flexible buffer cushion 29, and a unit type bottom cross beam frame 27 structure is arranged below the bottom cross beam frame arc support 28.
The backfill structure for the water supply pipe crossing the foundation pit comprises a pipe bottom water supply pipe 22, pipe bottom backfill 35, a formwork support system crossing the foundation pit water supply pipe base, a cast-in-place concrete base 36, a top-covering backfill formwork support system crossing the foundation pit water supply pipe, a pipe top bubble concrete top cover 37, pipe top backfill 38 and a recovery ground structure 39.
A support formwork system of a water supply pipe base traversing a foundation pit comprises a separated base regularization side formwork 40, a base side formwork fixing hanger rod 41, a base side formwork circular pipe fixing belt 42 and a base side formwork opposite-pulling piece 44, wherein two sides of the separated base regularization side formwork 40 are connected through the base side formwork opposite-pulling piece 44, the separated base regularization side formwork 40 is fixed by arranging the base side formwork fixing hanger rod 41 outside, the base side formwork fixing hanger rod 41 is connected with a reinforced concrete lintel 18, and the base side formwork circular pipe fixing belt 42 is arranged on the periphery of a water supply pipe 22 and used for supporting the water supply pipe 22 and preventing the water supply pipe from shaking in the pouring process; a formwork system is filled back in to crossing foundation ditch feed pipe top covering, including covering top side mould jib 25, covering top side mould split lug plate 45, bubble concrete side mould 46 and covering top side mould split 47, cover top side mould jib 25 hoist and mount bubble concrete and cover top side mould 46, bubble concrete covers top side mould 46 and utilizes covering top side mould split lug plate 45, covering top side mould split 47 and covering top side mould jib 25 fixed, covers top side mould jib 25 and fixes on reinforced concrete lintel 18.
The construction process is as follows:
step one, detection of a water supply pipe 22 crossing a foundation pit: and detecting by adopting a pipeline detector according to the placed point position.
Step two, excavating a soil body: after the position of the water supply pipe 22 is determined, a trench is excavated by using the excavator 1, the foundation pit soil body is excavated by using the shaped excavator bucket 5, the soil body is excavated by using the pipe bottom shaped cutting excavator 12 close to the water supply pipe 22, and the rubber pad 10 and the buffer layer 11 are arranged outside the water supply pipe to protect the water supply pipe 22.
Step three, excavation and support of a foundation pit on the water supply pipe 22: and excavating the foundation pit layer by layer, reinforcing the side slope, and timely constructing a support. Controlling the excavation depth of each layer within 1.5 m, timely constructing support, keeping the distance between soil nails at 1 m, and strictly controlling the construction length according to the design; the disturbance to the side slope soil body in the excavation and soil nail construction process is avoided as much as possible, and the excavation depth is strictly controlled.
Fourthly, constructing a pile-beam integrated suspension support beam shelving system: and constructing support piles 13 on two sides of the foundation pit along the direction of the water supply pipe 22, connecting the support piles 13 by reinforced concrete lintels 18 to form a pile-beam integrated suspension support beam laying system, and arranging pile-beam integrated reinforcement cages 19 at the joints of the support piles 13 and the reinforced concrete lintels 18 to reinforce the connection of the pile beams.
Step five, constructing a unit assembly type suspension protection system of a water supply pipe traversing the foundation pit: flexible cushions 29 are arranged at intervals of 1.2m outside the water supply pipe 22, bottom cross beam frame arc supports 28 are arranged at the corresponding lower ends, the bottom cross beam frame arc supports 28 are supported by a suspension protection system consisting of correspondingly arranged unit type bottom cross beam frames 27, unit type top cross beam frames 33 and reinforced concrete lintels 18, C30 reinforced concrete is applied to supporting piles and cross beams, the cross beams adopt embedded expanding templates and then are cast and wrapped on expanding sections, and the lintels are 5m multiplied by 0.8m (length multiplied by width multiplied by height).
Sixthly, excavating and supporting a foundation pit below the water supply pipe 22: and excavating the foundation pit below the water supply pipe 22 after the suspension protection system is stabilized, wherein the excavation is carried out from two ends to the middle part in a layered mode, and the construction monitoring is enhanced.
Seventhly, main structure and waterproof construction: after excavation supporting construction is carried out to the bottom of the foundation pit, a main structure of the interval is gradually constructed and water is prevented.
Step eight, backfilling at the bottom of the foundation pit: and after the main structure and the waterproof construction are finished, backfilling earthwork of the foundation pit, and backfilling the earthwork below the water supply pipe 22 to the position of 1.0m of the bottom of the pipe.
Ninth, water supply pipe 22 base formwork support and pouring construction: the base side die adopts a separated base regularization side die 40, and the base formwork supporting is realized through a base side die fixing hanger rod 41, a base side die ring pipe fixing band 42, a base side die counter-pulling vertical plate 43, a base side die counter-pulling piece 44 and the like. After the formwork is completed and the inspection is qualified, the water supply pipe 22 is poured with the concrete base 36 in situ. The base construction C15 concrete base is 1.2m wide and 1.5 m high, and the concrete is poured to the bottom of the pipe and is closely attached to the bottom of the pipe within 1.2 m.
Step ten, maintaining and removing the mold: and after the strength of the concrete reaches more than 70%, the fixed suspender 41 of the base side mould is removed.
Eleventh, top-covering backfill formwork support and pouring construction of the water supply pipe 22: and (3) removing the template of the cast-in-place concrete base 36, performing top covering backfill formwork erecting construction, realizing the construction of the top-covered formwork 46 by using the top-covered formwork suspender 25, the top-covered formwork counter-pulling lug plate 45 and the top-covered formwork counter-pulling piece 47, and pouring the tube top bubble concrete top cover 37 after the formwork erecting is finished and the inspection is qualified.
Step twelve, maintenance and form removal: and after the strength of the bubble concrete reaches more than 70%, removing the bubble concrete top-covering side mold 46.
Seventhly, backfilling the top of the water supply pipe 22 and recovering the ground structure construction: and after the top side mould of the aerated concrete is detached, checking that the aerated concrete at the top of the pipe has no construction problem, then performing top backfilling on the water supply pipe 22 and finally recovering the ground structure.
In step 2): the excavator 1 is provided with an excavator bucket rod 2 and a movable arm 23, the movable arm 23 is connected with a shaped excavator bucket 5 or a pipe bottom shaped cutting excavator 12, the shaped excavator bucket 5 is positioned on a toothed plate 24 through a positioning bucket tooth 8 (the positioning bucket tooth 8 is equivalent to a positioning line) and a bucket tooth limiting horizontal plate 6, a quick connecting piece 4 (the quick connecting piece adopts a positioning pin or a fastening bolt) is used for connecting a separated type excavating bucket tooth 7 and a bucket tooth bottom plate 9, and the positioning bucket tooth 8 and the bucket tooth limiting horizontal plate 6 are detached after connection; the shaped cutting excavator 12 at the bottom of the pipe comprises an arc-shaped bucket and a toothed plate 2 arranged on the arc-shaped bucket, wherein the arc-shaped bucket is matched with the outer diameter of the water supply pipe; the pipe bottom shaping cutting excavator 12 is connected with the excavator bucket rod 2 after being positioned by the bucket fixing plate 3, and the bucket fixing plate 3 is detached after the connection.
Claims (9)
1. The suspension protection system for the water supply pipe traversing the foundation pit is characterized by comprising a suspension support beam placing structure, a suspension structure for the water supply pipe traversing the foundation pit and a backfill structure for the water supply pipe traversing the foundation pit;
the suspension support beam laying structure comprises support piles (13), reinforced concrete lintels (18), a reinforced concrete lintel template system and a pile-beam integrated suspension support beam laying system;
the suspension structure for the water supply pipe crossing the foundation pit comprises a unit type top cross beam frame structure, a unit type bottom cross beam frame structure (27), a suspender (30) and a unit assembling type suspension protection system for the water supply pipe crossing the foundation pit;
the backfill structure for the water supply pipe crossing the foundation pit comprises a water supply pipe (22), pipe bottom backfill (35), a formwork support system for the water supply pipe base crossing the foundation pit, a cast-in-place concrete base (36), a top-covering backfill formwork support system for the water supply pipe crossing the foundation pit, a pipe top bubble concrete covering top (37), pipe top backfill (38) and a restoration ground structure (39);
the water supply pipe base formwork system crossing the foundation pit comprises a separated base sizing side die (40), a base side die fixing suspender (41), a base side die ring pipe fixing belt (42) and a base side die counter-pulling piece (44), wherein two sides of the separated base sizing side die (40) are connected through the base side die counter-pulling piece (44), the separated base sizing side die (40) is fixed by arranging the base side die fixing suspender (41), and the periphery of a water supply pipe (22) is provided with the base side die ring pipe fixing belt (42); it covers a backfill formwork system to cross foundation ditch feed pipe, including covering top side mould jib (25), covering top side mould split lug (45), bubble concrete cover top side mould (46) and cover top side mould split (47), cover top side mould jib (25) hoist and mount bubble concrete and cover top side mould (46), bubble concrete covers top side mould (46) and utilizes to cover top side mould split lug (45), covers top side mould split (47) and cover top side mould jib (25) fixed.
2. The transverse foundation pit service pipe suspension protection system according to claim 1, wherein the support piles (13) comprise support pile steel bars (14), support pile stirrups (48) and cast concrete (51); the reinforced concrete lintel (18) comprises lintel steel bars (49), lintel stirrups (50) and poured concrete (51).
3. The transverse foundation pit water supply pipe suspension protection system as claimed in claim 2, wherein the reinforced concrete lintel template system comprises an embedded expanding template (16) and a bracing type lintel template (17), the embedded expanding template (16) is installed on two sides of the reinforced concrete lintel (18) and then a post-cast wrapping expanding section (15) is coated on the two sides of the reinforced concrete lintel, the embedded expanding template (16) is not detached after being braced, and the bracing type lintel template (17) is installed on the bottom and two sides of the reinforced concrete lintel (18).
4. The transverse foundation pit feed pipe suspension protection system according to claim 2, wherein the pile-beam integrated suspension support beam shelving system comprises a pile-beam integrated reinforcement cage (19) and pile-beam reinforcement plates (20), and the pile-beam integrated reinforcement cage (19) and the pile-beam reinforcement plates (20) are arranged at the joint of the upper part of the support pile (13) and two sides of the reinforced concrete lintel (18).
5. The cross foundation pit water supply pipe suspension protection system as claimed in claim 1, wherein the unit type top cross beam frame structure comprises an integrally pre-embedded combination bolt group (21), a suspension rod (30), a unit type top cross beam frame (33) and a top cross beam frame adjusting bolt (34), the integrally pre-embedded combination bolt group (21) is connected with the unit type top cross beam frame (33), the unit type top cross beam frame (33) is connected with the suspension rod (30), and the suspension rod (30) and the unit type top cross beam frame (33) adjust the levelness of the suspension protection pipe through the top cross beam frame adjusting bolt (34); the unit type bottom cross beam frame structure (27) comprises a main suspension bearing beam (26), a bottom cross beam frame through long connecting piece (32) and a secondary suspension bearing beam (52), wherein the bottom cross beam frame through long connecting piece (32) is connected with the main suspension bearing beam (26) and the secondary suspension bearing beam (52), the main suspension bearing beam (26) is connected with a suspension rod (30), and a suspension rod reinforcing connecting rod (31) is arranged in the middle of the suspension rod (30).
6. The cross-foundation pit service pipe suspension protection system as claimed in claim 5, wherein the cross-foundation pit service pipe unit assembly suspension protection system comprises a bottom cross beam frame arc support (28) and a flexible buffer cushion (29), the flexible buffer cushion (29) is arranged outside the service pipe (22), the bottom cross beam frame arc support (28) is arranged outside the flexible buffer cushion (29), and a unit bottom cross beam frame structure (27) is arranged below the bottom cross beam frame arc support (28).
7. A construction method of a cross foundation pit water supply pipe suspension protection system according to any one of claims 1-6, characterized by comprising the following steps:
step one, detecting a water supply pipe crossing a foundation pit: detecting by using a pipeline detector according to the placed point position;
step two, excavating a soil body: after the position of the water supply pipe (22) is determined, a trench is excavated by using an excavator (1), the foundation pit soil body is excavated by using a shaped excavator bucket (5), the soil body is excavated by using a pipe bottom shaped cutting excavator (12) close to the water supply pipe (22), and a water supply pipe protection system is arranged;
step three, excavation and support of a foundation pit on the water supply pipe (22): excavating the foundation pit layer by layer, reinforcing the side slope, and timely constructing a support;
fourthly, constructing a pile-beam integrated suspension support beam shelving system: constructing support piles (13) at two sides of a foundation pit along the direction of a water supply pipe (22), connecting the support piles (13) by reinforced concrete lintels (18) to form a pile-beam integrated suspension support beam laying system, and arranging pile-beam integrated reinforcement cages (19) at the joints of the support piles (13) and the reinforced concrete lintels (18) to strengthen the connection of the pile beams;
step five, constructing a unit assembly type suspension protection system of a water supply pipe traversing the foundation pit: flexible cushion pads (29) are arranged on the outer side of the water supply pipe (22) at intervals, bottom cross beam frame arc supports (28) are arranged at the corresponding lower ends, and the bottom cross beam frame arc supports (28) are supported by a suspension protection system consisting of correspondingly arranged unit type bottom cross beam frame structures (27), unit type top cross beam frame structures and reinforced concrete lintels (18);
sixthly, excavating and supporting a foundation pit under the water supply pipe (22): excavating the foundation pit below the water supply pipe (22) after the suspension protection system is stable, wherein the excavation is carried out from two ends to the middle part in a layered mode, and construction monitoring is enhanced;
seventhly, main structure and waterproof construction: after excavation supporting construction is carried out to the bottom of the foundation pit, a main structure of the interval and water resistance are gradually constructed;
step eight, backfilling at the bottom of the foundation pit: after the main structure and the waterproof construction are finished, backfilling earthwork of the foundation pit, and backfilling the earthwork below the water supply pipe (22) to the position of 1.0m of the bottom of the pipe;
ninth, water supply pipe (22) base formwork support and pouring construction: the base side die adopts a separated base regularization side die (40), and base supporting is realized through a base side die fixing hanger rod (41), a base side die ring pipe fixing band (42), a base side die counter-pulling vertical plate (43) and a base side die counter-pulling part (44); after the formwork is erected and the inspection is qualified, pouring a water supply pipe (22) and a cast-in-place concrete base (36);
step ten, maintaining and removing the mold: after the concrete reaches the specified strength, the fixed suspender (41) of the base side mould is dismantled;
eleventh, top-covering backfill formwork support and pouring construction of the water supply pipe (22): after a template of a cast-in-place concrete base (36) is removed, top-covering backfill formwork erecting construction is carried out, formwork erecting of a top-covering side mould (46) is achieved through a top-covering side mould hanging rod (25), a top-covering side mould counter-pulling lug plate (45) and a top-covering side mould counter-pulling piece (47), and after formwork erecting is completed and inspection is qualified, a tube top bubble concrete top covering (37) is poured;
step twelve, maintenance and form removal: after the bubble concrete reaches the specified strength, the top-covered side die (46) of the bubble concrete is dismantled;
thirteen, backfilling the top of the water supply pipe (22) and recovering the ground structure construction: and after the top side mould of the aerated concrete is detached, checking that the aerated concrete at the top of the pipe has no construction problem, then performing top backfilling on the water supply pipe (22) and finally recovering the ground structure.
8. The construction method of the foundation pit crossing water supply pipe suspension protection system according to claim 7, wherein in the second step: a bucket rod (2) and a movable arm (23) of the excavator are arranged on the excavator (1), a shaped bucket (5) or a pipe bottom shaped cutter (12) is connected to the movable arm (23), and after the shaped bucket (5) is positioned on a toothed plate (24) through a positioning bucket tooth (8) and a bucket tooth limiting horizontal plate (6), a quick connecting piece (4) is used for connecting a separated type excavating bucket tooth (7) and a bucket tooth bottom plate (9); the pipe bottom shaping cutting digger (12); the pipe bottom shaping cutting excavator (12) is positioned by an excavator bucket fixing plate (3) and then is connected with an excavator bucket rod (2).
9. The construction method of the water supply pipe suspension protection system crossing the foundation pit according to claim 7, wherein the water supply pipe excavation protection system in the second step comprises a rubber pad (10) and a buffer layer (11), and the rubber pad (10) and the buffer layer (11) are arranged to protect the water supply pipe (22).
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| CN111270681A (en) * | 2020-03-18 | 2020-06-12 | 长江勘测规划设计研究有限责任公司 | Construction method and structure of support structure suitable for crossing foundation pit pipeline group |
| CN111577980A (en) * | 2020-04-17 | 2020-08-25 | 中建五局第三建设有限公司 | Nondestructive protection construction method and structure for foundation pit excavation pipeline of linear engineering in old city |
| CN111706712B (en) * | 2020-06-08 | 2022-03-25 | 中建五局土木工程有限公司 | Large-span water supply pipeline supporting system and construction method thereof |
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