CN108661063A - A kind of sand foundation base pit dewatering constructing structure and construction method - Google Patents

A kind of sand foundation base pit dewatering constructing structure and construction method Download PDF

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Publication number
CN108661063A
CN108661063A CN201810636362.8A CN201810636362A CN108661063A CN 108661063 A CN108661063 A CN 108661063A CN 201810636362 A CN201810636362 A CN 201810636362A CN 108661063 A CN108661063 A CN 108661063A
Authority
CN
China
Prior art keywords
pit
locally deep
dewatering
strainer
construction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201810636362.8A
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Chinese (zh)
Inventor
马全丽
苏建
张驰浩
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MCC Tiangong Group Tianjin Corp Ltd
Original Assignee
MCC Tiangong Group Tianjin Corp Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MCC Tiangong Group Tianjin Corp Ltd filed Critical MCC Tiangong Group Tianjin Corp Ltd
Priority to CN201810636362.8A priority Critical patent/CN108661063A/en
Publication of CN108661063A publication Critical patent/CN108661063A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • E02D19/06Restraining of underground water
    • E02D19/10Restraining of underground water by lowering level of ground water

Abstract

The present invention provides a kind of sand foundation base pit dewatering constructing structures, including:The casing being set in foundation pit locally deep pit is provided with several through-holes on the tube wall of described sleeve pipe;And it is set to the drainage layer between described sleeve pipe outer wall and the locally deep pit inner wall;And it is set to foundation pit locally deep pit bottom, the water pump in described sleeve pipe;And it is set to the filter pipe in described sleeve pipe, described filter pipe one end is connect with the water pump, and the other end stretches out the foundation pit locally deep pit;Additionally provide a kind of construction method carrying out sand foundation dewatering construction using the constructing structure, including excavation of foundation pit, locally deep pit excavates, arrange dewatering construction structure, dewatering operation, well head closure pour bottom plate, and the beneficial effects of the invention are as follows the locally deep pit precipitation for being appropriate for sand foundation, construction efficiency is high, and construction safety is easy.

Description

A kind of sand foundation base pit dewatering constructing structure and construction method
Technical field
The invention belongs to building engineering fields, construct more particularly, to a kind of deeper region base pit dewatering in sand foundation part Structure and construction method.
Background technology
The area of building construction underground structure continues to increase, and depth is constantly deepened, and construction and excavation quantities is big.Sand refers to Soil particle forms the higher soil of sand grains content, often with there is a higher-strength under dead weight, but when carrying out excavation work When industry, shock loads effect is generated, it is possible to create sand liquefaction largely shakes notch distortion, loses bearing capacity, causes to cave in.
Moreover, because sand quality is loosely, jumbo is difficult to enter, and materials dumping is difficult.
Therefore, it is excavated on sand foundation, has and be easy landslide, the technologies such as materials dumping is difficult, and construction efficiency is low Difficult point.
In the deeper region in the foundation pits such as elevator and catch pit part than periphery foundation pit depth, so the meeting when excavating locally deep pit Encounter underground water, need to carry out precipitation processing, and due to the bulk characteristics of sand, be susceptible to when precipitation processing landslide and Drift sand influences working efficiency.
Invention content
The problem to be solved in the present invention be to provide it is a kind of suitable for sand foundation base pit dewatering construction constructing structure and apply Work method is especially suitable for carrying out the locally deep pit precipitation of sand foundation, and construction efficiency is high, and construction safety is easy.
In order to solve the above technical problems, the technical solution adopted by the present invention is:One kind being suitable for sand foundation base pit dewatering The constructing structure of construction, including:
The casing being set in foundation pit locally deep pit is provided with several through-holes on the tube wall of described sleeve pipe;And
The drainage layer being set between described sleeve pipe outer wall and the locally deep pit inner wall;And
It is set to foundation pit locally deep pit bottom, the water pump in described sleeve pipe;And
The filter pipe being set in described sleeve pipe, described filter pipe one end are connect with the water pump, described in other end stretching Foundation pit locally deep pit.
Preferably, further include ring flange, the ring flange is arranged at the filter pipe and stretches out the foundation pit part One end of dell.Setting ring flange is to block well head in order to be matched with blind flange after the completion of dewatering construction and use, using flange Closure shaft collar is simpler, and sealing effect is good, and connection reliability is high.
It is further used as preferably, annular groove is provided on the ring flange, the groove, which is arranged for installation, to be stopped Water cushion circle.With the above arrangement, sealing washer is arranged in the mating surface of ring flange and blind flange, well head envelope is further increased The leakproofness of bridging structure.
The purpose that drainage layer is arranged avoids extracting the mud of underground together with underground water out when groundwater abstraction, avoid because This and may caused by drift sand or the prominent unexpected situation for the influences construction such as gushing.
There are many forms that drainage layer is arranged, depending on the specific situation of construction,
Preferably, to adapt to sand foundation the characteristics of, the drainage layer include be set to described sleeve pipe outer wall outer Wall strainer, and the cobble drainage layer that is set between described sleeve pipe outer wall and the locally deep pit inner wall.
It is further used as preferably further including the inner wall strainer for being set to described sleeve pipe inner wall;The mesh of the inner wall strainer Mesh number of the number more than the outer wall strainer.It is arranged by double-layer leaching net, further avoids water pump by sand together with underground water one It rises and pumps out.
It is further used as preferably, to adapt to the characteristic of sand foundation, the form of strainer uses plain net.Metal can be used Net or nonmetallic net preferably select type easy to process simple in structure.
The present invention also provides a kind of sand foundation base pit dewatering construction method using the above constructing structure, feature exists In including the following steps:
S1. use caisson excavation pit to marking depth;Preferably, the caisson used is the combination of multi-layer compact caisson, Single Large Caisson is replaced using multi-layer compact caisson, the weight of caisson monomer can be reduced, can also reduce its mating fortune The weight of defeated lifting machine is suitable for sand foundation construction, improves construction efficiency;
S2. locally deep pit is excavated;
S3., the casing of the eyelet of outsourcing strainer is set in locally deep pit, ovum is filled between casing and dell crater wall Stone;Preferably, the strainer of outsourcing strainer mesh number is more than in inside pipe casing setting mesh number.By the way that dual strainer is arranged, into one Step avoids water pump and pumps out sand together with underground water.
S4. water pump is set in locally deep pit bottom;
S5., filter pipe is set, and one end of filter pipe is connect with water pump, and the other end stretches out locally deep pit;
S6. dewatering operation is carried out;
S7. water pump is taken out;
S8. base plate of foundation pit, sealing wellhead are poured.
Preferably, filter pipe top mounting flange, in step S8, Slab Waterproof Construction, waterproof is rolled up to ring flange Bottom, and carry out waterproof reinforced.Before underplate concrete pours, with flange disk cover by wellhead sealing, ring flange and flange disk cover Between add sealing washer, play sealing effect.Then underplate concrete is poured, the local dewatering of the dells such as elevator foundation pit is completed Operation.
The invention has the advantages and positive effects that:
1, it can ensure stability of slope, the stake stabilization in foundation pit, prevent drift sand and foundation pit collapse.
2, dewatering effect is good, accelerates construction progress, and ensures construction quality.
Description of the drawings
Fig. 1 be one embodiment of the invention dewatering construction in status diagram
Fig. 2 is the dewatering construction completion status schematic diagram of one embodiment of the invention
Fig. 3 is the strainer partial schematic diagram of one embodiment of the invention
In figure:
1, casing 2, filter pipe 3, ring flange
4, outer wall strainer 5, inner wall strainer 6, water pump
7, cobble drainage layer 8, blind flange 9, sealing washer
10, waterproof layer 11, pour bottom plate
Specific implementation mode
As Fig. 1, one embodiment of the invention dewatering construction in shown in status diagram, one embodiment of the invention includes:
The casing 1 being set in foundation pit locally deep pit is provided with several through-holes on the tube wall of casing 1;And
It is set to foundation pit locally deep pit bottom, the water pump in casing;And
The filter pipe being set in casing, filter pipe one end are connect with water pump, and the other end stretches out foundation pit locally deep pit;And
The cobble drainage layer 7 being set between 1 outer wall of casing and locally deep pit inner wall;According to sand in the present embodiment The characteristics of base, in other embodiments of the invention, can select other using cobble as drainage layer filler according to actual demand The drainage layer filler of type.
Preferably, double-layer leaching net is used in the present embodiment, is surrounded by outer wall strainer 4 on 1 outer wall of casing, inner wall is surrounded by Inner wall strainer 5.The mesh number of inner wall strainer 5 is more than the mesh number of outer wall strainer 4, to achieve the effect that further to filter.
It in other embodiments of the invention, also can be individually only with outer wall strainer 4 or inner wall strainer 5.
In the present embodiment, as shown in figure 3, to adapt to the characteristic of sand foundation, the form of strainer uses plain net.
In the present embodiment, preferably, further include ring flange 3, ring flange is arranged at filter pipe 2 and stretches out foundation pit office One end of portion's dell.Setting ring flange 3 is to block well head in order to be matched with blind flange 8 after the completion of dewatering construction and use, use Flange closure shaft collar is simpler, and sealing effect is good, and connection reliability is high.
It is further used as preferably, annular groove is provided on ring flange 3, groove is arranged for installation sealing washer 9. With the above arrangement, sealing washer 9 can be arranged in the mating surface of ring flange 3 and blind flange 6, well head envelope is further increased The leakproofness of bridging structure.
Such as Fig. 2, the dewatering construction completion status schematic diagram of one embodiment of the invention, one embodiment of the invention precipitation is completed Afterwards, well head, which blocks, completes.
Water pump 6 is withdrawn from from well;
Underplate concrete 11 is poured to 3 bottom of ring flange, and pouring has waterproof layer 10 between bottom plate 11 and ring flange 3;
Coordinated using blind flange 7 and ring flange 3, carries out well head closure, set in mating surface of the ring flange 3 with blind flange 6 Set sealing washer 9.
One embodiment of sand foundation base pit dewatering construction method provided by the present invention:
S1. use caisson excavation pit to marking depth;In the present embodiment, preferably, the caisson used is that multilayer is small The combination of type caisson replaces single Large Caisson using multi-layer compact caisson, can reduce the weight of caisson monomer, can also subtract The weight of its small mating transporting and hoisting machinery is suitable for sand foundation construction, improves construction efficiency;
S2. locally deep pit is excavated;
S3., the casing of the eyelet of outsourcing strainer is set in locally deep pit, ovum is filled between casing and dell crater wall Stone;In the present embodiment, preferably, the strainer of outsourcing strainer mesh number is more than in inside pipe casing setting mesh number.Pass through setting Dual strainer further avoids water pump and pumps out sand together with underground water.In other embodiments of the invention, also may be used It is arranged using single layer strainer;
S4. water pump is set in locally deep pit bottom;
S5., filter pipe is set, and one end of filter pipe is connect with water pump, and the other end stretches out locally deep pit;
S6. dewatering operation is carried out;
S7. water pump is taken out;
S8. base plate of foundation pit, sealing wellhead are poured.
In the present embodiment, preferably, filter pipe top mounting flange, in step S8, Slab Waterproof Construction Waterproof is rolled up to flange pan bottom, and carries out waterproof reinforced.Before underplate concrete pours, with flange disk cover by wellhead sealing, method Sealing washer is added between blue disk and flange disk cover, plays sealing effect.Then underplate concrete is poured, elevator foundation pit etc. is completed The local dewatering operation of dell.In other embodiments of the invention, other wellhead sealing methods can also be used.
The embodiments of the present invention have been described in detail above, content is only the preferred embodiment of the present invention, no It can be believed to be used to limit the scope of the invention.Any changes and modifications in accordance with the scope of the present application, It should still fall within the scope of the patent of the present invention.

Claims (18)

1. a kind of sand foundation base pit dewatering constructing structure, which is characterized in that
Including:
The casing being set in foundation pit locally deep pit is provided with several through-holes on the tube wall of described sleeve pipe;And
The drainage layer being set between described sleeve pipe outer wall and the locally deep pit inner wall;And
It is set to foundation pit locally deep pit bottom, the water pump in described sleeve pipe;And
The filter pipe being set in described sleeve pipe, described filter pipe one end are connect with the water pump, and the other end stretches out the foundation pit Locally deep pit.
2. a kind of sand foundation base pit dewatering constructing structure according to claim 1, it is characterised in that:
Further include ring flange, the ring flange is arranged at one end that the filter pipe stretches out the foundation pit locally deep pit.
3. a kind of sand foundation base pit dewatering constructing structure according to claim 2, it is characterised in that:
Annular groove is provided on the ring flange, the groove is arranged for installation sealing washer.
4. a kind of sand foundation base pit dewatering constructing structure as claimed in any of claims 1 to 3, feature exist In:
The drainage layer include be set to the outer wall strainer of described sleeve pipe outer wall, and
The cobble drainage layer being set between described sleeve pipe outer wall and the locally deep pit inner wall.
5. a kind of sand foundation base pit dewatering constructing structure according to claim 4, it is characterised in that:
It further include the inner wall strainer for being set to described sleeve pipe inner wall;
The mesh number of the inner wall strainer is more than the mesh number of the outer wall strainer.
6. a kind of sand foundation base pit dewatering constructing structure according to claims 1 or 2 or 3 or 5, it is characterised in that:
The type of weave of the strainer is plain net.
7. a kind of sand foundation base pit dewatering construction method, which is characterized in that include the following steps:
S1. use caisson excavation pit to marking depth;
S2. locally deep pit is excavated;
S3., the casing of the eyelet of outsourcing strainer is set in locally deep pit, cobble is filled between casing and dell crater wall;
S4. water pump is set in locally deep pit bottom;
S5., filter pipe is set, and one end of filter pipe is connect with water pump, and the other end stretches out locally deep pit;
S6. dewatering operation is carried out;
S7. water pump is taken out;
S8. base plate of foundation pit, sealing wellhead are poured.
8. a kind of sand foundation base pit dewatering construction method according to claim 7, it is characterised in that:Execute step S3 When, it is more than the strainer of outsourcing strainer mesh number in inside pipe casing setting mesh number.
9. a kind of sand foundation base pit dewatering construction method according to claim 7, it is characterised in that:Execute step S1 When, the caisson used is the combination of multi-layer compact caisson.
10. a kind of sand foundation base pit dewatering construction method according to any one of claim 7 to 9, feature exist In:
When executing step S5, one end mounting flange of locally deep pit is stretched out in filter pipe;
When executing step S8, is coordinated using blind flange and ring flange, sealing washer is added between ring flange and blind flange.
CN201810636362.8A 2018-06-20 2018-06-20 A kind of sand foundation base pit dewatering constructing structure and construction method Pending CN108661063A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810636362.8A CN108661063A (en) 2018-06-20 2018-06-20 A kind of sand foundation base pit dewatering constructing structure and construction method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810636362.8A CN108661063A (en) 2018-06-20 2018-06-20 A kind of sand foundation base pit dewatering constructing structure and construction method

Publications (1)

Publication Number Publication Date
CN108661063A true CN108661063A (en) 2018-10-16

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ID=63772182

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810636362.8A Pending CN108661063A (en) 2018-06-20 2018-06-20 A kind of sand foundation base pit dewatering constructing structure and construction method

Country Status (1)

Country Link
CN (1) CN108661063A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111501767A (en) * 2020-03-24 2020-08-07 中铁隧道局集团建设有限公司 Foundation pit base surface hydration-free construction structure under sandy cobble and mudstone geological conditions

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111501767A (en) * 2020-03-24 2020-08-07 中铁隧道局集团建设有限公司 Foundation pit base surface hydration-free construction structure under sandy cobble and mudstone geological conditions

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