CN1193065A

CN1193065A - Method of alternatively taking out soil for construction of underground engineering

Info

Publication number: CN1193065A
Application number: CN97100623A
Authority: CN
Inventors: 贾恩福; 张斌; 王振华; 梁喜顺
Original assignee: SHIJIAZHUANG CITY CONSTRUCTION COMMITTEE
Current assignee: SHIJIAZHUANG CITY CONSTRUCTION COMMITTEE
Priority date: 1997-03-07
Filing date: 1997-03-07
Publication date: 1998-09-16

Abstract

The present invention relates to an inverse-operation earth-cutting new process for underground engineering. It is characterized by that in the course of underground construction, after the top plate is poured, under the covering action of said top plat said invention fully uses the undisturbed earth body and formed column body as temporary support of the top plate, and in underground first floor, it uses four columns as support around every column and alternatively excavates earth around said column (i.e. "using four to support one"), and after the internal structure of underground first floor is completed, and uses eight columns to support around every column in underground second floor (i.e. "using eight to support one") and alternatively excavates earth and makes the constructions of gusset treatment, etc..

Description

Reverse construction underground construction " four tops one ", " eight tops one " staggered soil digging method

The invention belongs to a kind of building foundation construction technology, the new technology of particularly a kind of underground construction contrary sequence method soil digging.

In the underground building in reverse construction, cubic metre of earth excavation be after top board and post are finished, under top board covers, carry out soil digging and make lower floor's cap (or interim basis), at this moment the earthwork is in case excavation, top board and post begin carrying, and therefore, whether the shoveling scheme is suitable, to the inhomogeneous structure crack that produces of control structure load-bearing, even destruction is very important.Adopt lower joint pin channel-type soil digging method before, only make top board earlier, connect behind the pillar, draw by root by mast axis and dig soil on every side, the soil excavation around any single-column often need be set up a lot of interim supports, the expense costliness, and technology is loaded down with trivial details; Add interim support load-bearing inequality, structure is easy to crack, and can only construct by the root pillar in same passage, and speed is slow, and is very uneconomical.

The purpose of this invention is to provide a kind of under covering, can drawing continuously and dig the earthwork on every side of several posts with the reverse construction underground construction, utilize post, soil body acting in conjunction to form support system and no longer set up interim support, and can control a kind of soil digging method of structure crack that differential settlement causes.

Main technical schemes of the present invention is: earlier with the method one-step pore-creating of double-layer structure post with drill-pouring, an install reinforcing cage, a pour-shaping, but by (slightly) sand in highly in the hole, filling up the post concrete is divided into two sections at plate-girder post node place, so that node is constructed later on.After having watered top board, under top board covers, make full use of and be undisturbed the interim support of the soil body and molded post as plate, the maximum of utilizing finite element theory to calculate plate according to two-layer load difference allows unsettled span, around each post of B1, do to support (i.e. " four tops one ") with four posts, the earthwork around the staggered excavation post, processing node, construction cap etc.After the completion of B1 internal construction, around underground two layers of each post, make to support (i.e. " eight tops one "), the earthwork around the staggered excavation post, job practicess such as processing node again with eight posts.

Adopt constructure scheme of the present invention, technology is simple, practical, not as any interim support, can be in construction simultaneously between the different posts with one deck, draw continuously and dig the earthwork on every side of some posts, improved speed of application, reduced cost, excessive differential settlement be can not occur, structural safety and construction safety guaranteed.

Below in conjunction with accompanying drawing the present invention is further described.

Accompanying drawing 1 is " four tops one " schematic diagram.

Accompanying drawing 2 is " four tops one " soil digging scheme schematic diagram.

Accompanying drawing 3 is " eight tops one " schematic diagram.

Accompanying drawing 4 is " eight tops one " shoveling cell schematics.

Arabic numerals in the accompanying drawing are the numbering of post.

First with the method one-step pore-creating of double-layer structure post with drill-pouring, an install reinforcing cage, a pour-shaping, but by (slightly) sand in highly in the hole, filling up the post concrete is divided into two sections at plate-girder post node place, so that node is constructed later on.Underground first floor structural load is top board and deadweight of top earthing and live load, through checking computations and force analysis, if excavate a certain single-column surrounding soil, four pillar utilizations on every side are undisturbed the soil body and post as support, span according to the excavation passage is calculated, unsettled span can satisfy the unsettled of this single-column fully, forms " four tops one ", referring to accompanying drawing 1.Therefore, after having excavated around this root pillar cubic metre of earth, the disposable plates bean column node forms overall structure and reaches supporting role rapidly.Other pillar therewith roughly the same, adopt " four tops one " staggered shoveling scheme, referring to accompanying drawing 2, specific implementation method is: (1) excavates a unearthed work ditch earlier in bigger place in a side place of building, the bottom of trench absolute altitude is with the first floor ground level, put a muck haulage ramp in ditch, purpose is to transport outside the venue for the earthwork that will draw out; Or utilizing top board hole to be provided such as daylight opening, wind passage mouth etc., the installation vertical transportation machinery is put on soil and is transported outside the venue on mouth.(2) every interval two organ timbering dig a passage earlier at span centre, passage is communicated with unearthed work ditch or top board hole to be provided, in passage, excavate the post earthwork on every side by 1,2,3,4 orders, processing node, construction cap, the pillar of same sequence number can be constructed simultaneously, the sequence number of having constructed is for behind the post of " 1 ", and the preface of constructing again is the post of " 2 ", by that analogy.(3) all caps are all finished, and after the formation integrated support system, the excavation interlayer remains all cubic metres of earth, forms large space, carry out construction of first floor internal construction and equipment installation.

Subbasement structural load, force mechanism and mode of transfer force are different with first floor, take into full account first floor space rigidity through stressed analysis, utilize cap, post and around be undisturbed the soil body and calculate maximum as the interim support of upper load and fill and permitted unsettled span, consequently around being in when unsettled, a certain single-column need eight pillars and the soil body to bear jointly, form " eight tops one ", see accompanying drawing 3." eight tops one " the staggered soil digging method of specifically implementing in a shoveling unit is referring to accompanying drawing 4, that is: (1) reduces to second layer ground level place with original work bottom of trench absolute altitude, put a muck haulage ramp in the ditch, or same at the reserved opening place along the following vertical transportation machinery second layer.(2) arrange earlier and dig,, handle by the root pillar along mast axis excavation passage from A, treat that A arranges " 3 " root base for post and watered after, excavate C and arrange " 1 " root base for post; After A arranges " 6 " root base for post and waters, excavate B then and arrange " 1 " root base for post; After B arranges " 3 " root base for post and waters, excavate D again and arrange " 1 " root base for post,, carry out forward in proper order according to arranging about unit form shown in Figure 4.(3) all pattens are finished the back and are formed the overall structure system, and the excavation interlayer remains all cubic metres of earth, and the formation large space carries out the construction of second layer internal construction and equipment is installed.

The present invention tests in certain construction work, achieves success, and 44155 square metres of this project building areas, 18600 square metres of its top board areas, underground two-layer.Adopt technical scheme of the present invention, reduce earth excavation 2.3 ten thousand steres; Make full use of clay model and reduce more than 40,000 square metre of formwork area, save timber one over thousands of cubic meter, reduce investment outlay more than 1,000 ten thousand yuan altogether, only just recovered traffic above-ground, afforest, the degree that minimizes is disturbed in traffic with 6 months.

Claims

1. a reverse construction underground construction " four tops one ", " eight tops one " staggered soil digging method, earlier with the method one-step pore-creating of double-layer structure post with drill-pouring, install reinforcing cage, fill up sand post concrete at plate-girder post node place by height in the hole and be divided into two sections, a pour-shaping is then at the same high work ditch with first floor ground of building one side excavation, put a muck haulage ramp in the ditch, or utilize the top board hole to be provided, vertical transport mechanism is installed on the hole, its feature:

The underground first floor of a adopts " four tops one " staggered soil digging method, that is: (1) every interval two organ timbering dig a passage earlier at span centre, press 1 in the passage, 2,3, No. 4 orders are excavated the post earthwork on every side, processing node, construction cap, the pillar of same sequence number can be constructed simultaneously, the sequence number of having constructed is for behind the post of " 1 ", and the sequence number of constructing again is the post of " 2 ", by that analogy; (2) all caps are all finished, and after the formation integrated support system, the excavation interlayer remains all cubic metres of earth, forms large space, carry out underground first floor internal construction construction and equipment installation;

The b subbasement adopts " eight tops one " staggered soil digging method, promptly; (1) original work bottom of trench absolute altitude is reduced to second layer ground level place, put a muck haulage ramp in the ditch, or same suitable vertical transport is down reduced to the second layer at the reserved opening place; (2) in a shoveling unit, earlier arrange the beginning from A, along mast axis excavation passage, handle by the root pillar, treat that A arranges " 3 " individual base for post and watered after, excavation C arranges " 1 " individual base for post, after A arranges " 6 " individual base for post and watered, excavate B then and arrange " 1 " base for post, B arranges and excavates D again after " 3 " individual base for post waters and arrange " 1 " individual base for post, according to arranging about this unit form, carry out forward in proper order; (3) all base for posts finish forming the overall structure system, and the excavation interlayer remains all cubic metres of earth, form large space and carry out construction of second layer internal construction and equipment installation.