Reinforcement retrains native composite support structure
The utility model relates to the foundation pit supporting project in the civil construction project, the composite support structure of particularly a kind of vertical supporting and protection structure and reinforcement constraint soil.
In foundation ditch composite support structure, have or not and support supporting and protection structure and support supporting and protection structure is arranged at present.Have and support the existence of supporting and protection structure because of supporting, the earthwork need repeatedly be had bad luck, and influences soil excavation; Supporting construction, maintenance and tearing support open all needs the time, influences construction speed.Do not have and support commonly used the having of supporting scheme: composite soil nailing, stake and anchor pole composite support etc.The common soil nailing of composite soil nailing is to adopt reinforcing bar or fine steel tube, process using is got the hole earlier, put into reinforcing bar or fine steel tube then, slip casting forms soil nailing again, also have and adopt directly the technology that reinforcing bar or fine steel tube are squeezed into the soil body to form soil nailing, these soil nailings form one with vertical stake supporting and protection structure, constitute whole composite soil nailing structure, and this technology is used in preferably in the soil layer usually.Stake and anchor pole composite support structure are meant: stake is vertically arranged, between stake and stake, perform anchor pole, anchor pole will have free end and fixed end two parts to constitute usually, length requirement is longer, and boring and grouting process must be arranged, also have in recent years to adopt and revolve anchor method construction anchor pole, but all must have anchoring section and free section two parts generally, the length of anchor pole all is long.
The stressed principle of above-mentioned two kinds of soil nailings all is that soil nailing needs enough length and extends through imaginary dangerous sliding surface in the stable soil body, the pulling force that this part soil nailing needs to provide enough is resisted the power that sliding mass produces, and soil nailing is stressed behind soil deformation.
(application number: 200810049535.2), its horizontal direction is to adopt anchor pole that free section is arranged to draw anchor in the supposition of far-end fixedly on the soil body possible sliding mass for existing compound invention such as PHC pipe-pile pile-anchor combined support water stop construction method; (application number: 02113047.7), its horizontal direction is to adopt the soil nailing of self-drilling, near the stake end free section is being arranged with soil nailing for the method for composite soil nailing construction and supporting construction.Above-mentioned two kinds all have characteristics, and at the stake end free end are arranged, and have applied prestressing force.In addition, the soil nailing in some other patent is fine steel tube or reinforcing bar outer wrapping mortar, and at hole wall hanging steel mesh reinforcement and sprayed mortar surface layer; Require the soil nailing inclination angle to be greater than 5 degree in some patents; Only hang steel mesh reinforcement and sprayed mortar surface layer because of the hole wall in each composite soil nailing structure, do not require soil nailing to be connected with vertical soil-baffling structure with enclosing purlin.
Summary of the invention
Technical problem: the purpose of this utility model aims to provide a kind of reinforcement and retrains native composite support structure, and this structure construction is convenient, and speed of application is fast, saves cost, reduces investment.It has overcome the deficiencies in the prior art, accomplishes that retaining soil, sealing, structure are three-in-one, supports convenient shoveling and basement civil engineering in the cancellation.This form reinforcement quantity and length are regulated with the soil property situation, and construction costs is low, and speed of application carries out with the shoveling progress, shorten construction period.
Technical scheme: reinforcement of the present utility model retrains native composite support structure by reinforcement, the collar tie beam of the stake of the native sealing supporting and protection structure of preposition retaining, the native usefulness of constraint be connected and enclose purlin and form; Wherein, the stake of the native sealing supporting and protection structure of preposition retaining vertically is provided with in a row or circle; Top in the stake of the native sealing supporting and protection structure of preposition retaining is provided with collar tie beam, and the stake of the native sealing supporting and protection structure of a plurality of preposition retainings is connected into an integral body; Constraint soil uses reinforcement horizontally set, one end to stretch in the constraint soil, and the other end is fixed in the stake of the native sealing supporting and protection structure of preposition retaining by enclosing purlin.
Constraint soil adopts corrugated sheet, steel pipe or shaped steel with reinforcement.
The arranged outside of the native sealing supporting and protection structure of preposition retaining stake has outer gear soil sealing supporting and protection structure, this moment, collar tie beam connected into an integral body with stake of the native sealing supporting and protection structure of preposition retaining and the native sealing supporting and protection structure of outer gear on the direction of its width, on its length direction the stake of the native sealing supporting and protection structure of preposition retaining is connected into a row or a circle, the stake of preposition retaining soil sealing supporting and protection structure is connected with the reinforcement of the native usefulness of constraint.
Beneficial effect: its reinforcement adopts shaped steel such as corrugated sheet, steel pipe, I steel usually, and short, thicker.This composite support structure is enclosed the purlin structure in conjunction with the constraint soil body, preposition retaining soil water-stopping structure and with soil-baffling structure reliably is connected, has formed reinforcement composite support structure.The effect of reinforcement is the constraint soil body, forms a compound constant body, and this obligatory point links together with stake, has formed the composite support system jointly.
Compare with traditional supporting and protection structure, the utility model has plurality of advantages:
1) do not have interior support, saved the time of supporting in the construction, and the time of supporting in removing, the duration saved;
2) do not have interior support, it is convenient to cut the earth;
3) for large-scale foundation ditch, the main building of can constructing earlier, back construction podium, the occupation of land of podium part can be used for the construction plant of main building construction, can form the streamline construction like this, helps the reduction of erection time, helps the job placement of each work post;
4) constructional materials can transport directly to the job site, reduces secondary and has bad luck expense;
5) compare with the anchor pole composite support with stake, this method floor space is little, need not maintenance, saves the duration, water not during construction, and the place is clean;
6) compare with common composite soil nailing, this method supporting degree of depth is big, and suitable soil layer is wide;
7) the reinforcement construction is carried out with soil excavation, does not take the duration, can save the duration of whole engineering;
8) make things convenient for the basement block construction, reduce construction costs.
Description of drawings
Fig. 1 is native single pile composite supporting structural representation for reinforcement retrains.
Fig. 2 is native double-row pile composite support structural representation for reinforcement retrains.
Have among the figure: purlin 4, outer gear soil sealing supporting and protection structure 5 are enclosed in the native sealing supporting and protection structure of preposition retaining stake 1, the reinforcement 2 of the native usefulness of constraint, collar tie beam 3, connection.
The specific embodiment
The utility model is made of jointly native water-stopping structure of preposition retaining and reinforcement constraint soil, the native water-stopping structure of the preposition retaining outside is according to the design needs native sealing supporting and protection structure of outer gear of can constructing, native water-stopping structure of preposition retaining and outer gear soil sealing supporting and protection structure can adopt deep-mixed pile commonly used to add and insert pile for prestressed pipe, H shaped steel in bored pile or the deep-mixed pile, the certain degree of depth of the soil body after reinforcement uses implantation by layering embedded pile between stake, and with every layer of reinforcement at stake face with enclosing the purlin connection.Reinforcement can adopt corrugated sheet, corrugated guardrail plate, steel pipe or shaped steel, in the shaped steel the most frequently used have H shaped steel, I steel, angle steel ,+the word steel, after reinforcement is implanted the soil body, the soil body around the closely knit reinforcement, the reinforcement and the soil body form constraint soil, become class gravity barricade with soil body acting in conjunction, the lateral earth pressure that makes the soil body act on the preposition pile body reduces greatly.
Preposition sealing of the present utility model and soil-baffling structure be type selecting in multiple usual manner as required, and adopts different arrangements of reinforcement.After the construction of sealing and soil-baffling structure finished, the reinforcement construction was carried out with the shoveling layering, encloses purlin with concrete or steel work thereupon reinforcement is connected with the native water-stopping structure of preposition retaining stake face.
The job practices that reinforcement of the present utility model retrains native composite support structure is:
1) the native water-stopping structure structure of elder generation's preposition retaining of construction;
2) according to the outer gear soil of design needs construction sealing supporting and protection structure;
3) with collar tie beam the native water-stopping structure of preposition retaining is linked to be integral body on the top, as be provided with outer gear soil sealing supporting and protection structure, collar tie beam is linked to be integral body on the top of native water-stopping structure of preposition retaining and outer gear soil sealing supporting and protection structure, and the collar tie beam between the native water-stopping structure of two gears should connect as a whole;
4) cut the earth to the absolute altitude place of the native first floor reinforcement of reinforcement constraint;
5) the first floor reinforcement that successively reinforcement retrained in the soil of use equipment passes the native water-stopping structure of preposition retaining and is implanted in the soil by root;
6) with enclosing purlin first floor reinforcement and the native sealing supporting and protection structure of the preposition retaining stake surface that reinforcement retrains in the soil connected into integral body;
7) according to designing requirement, repeat the 4-6 step, successively to cut the earth, the every layer of reinforcement of successively constructing retrains soil and encloses purlin until all layers arrival hole end absolute altitude;
So far, promptly finish the construction that reinforcement retrains native composite support structure.
Certain engineering excavation of foundation pit degree of depth 12m, adopt reinforcement to retrain native composite support structure, sealing adopts three deep-mixed piles, retaining soil adopts bored pile, pile body diameter 1000mm, arrangement of reinforcement 16@22, concrete adopts c30, establish 6 layers of reinforcement altogether, reinforcement adopts H shaped steel, horizontal interval 1.4m, and implantation depth 10-12m does not wait, the implantation mode adopts puts into precasting steel frame with H shaped steel, head in the soil body with jack again, when H shaped steel single-unit length is not enough, adopt merogenesis to head into, welding manner is adopted in the joint, connects length and satisfies 10-12m.
Certain engineering excavation of foundation pit degree of depth 15m, adopt reinforcement to retrain native composite support structure, keep off native water-stopping structure and adopt the patented technology PCMW worker method (patent No.: ZL200710191066.3), prestress high intensity concrete prefabricated tubular pile diameter 800mm, establish 7 layers of reinforcement altogether, reinforcement adopts corrugated guardrail plate 4320x310x85x4, horizontal interval 1.2m, implantation depth 12-18m does not wait, the implantation mode adopts puts into precasting steel frame with corrugated guardrail plate, heads in the soil body with excavator, when corrugated guardrail plate single-unit length is not enough again, the employing merogenesis heads into, and the joint adopts the connection of rivet connecting method to satisfy 12-18m.
Reinforcement of the present utility model retrains in the native composite support structure, soil-baffling structure can adopt multiple formation such as bored pile, pile for prestressed pipe, H shaped steel, water-stopping structure can be selected multiple formation such as three agitation piles, twin shaft agitation pile, rotary churning pile for use, reinforcement should reach certain length and reach certain width to guarantee the constraint soil body after the stake, simultaneously reinforcement distributes and will reach certain density and should be not too short, to guarantee can to retrain really the soil body after the stake, the reinforcement surface should fully contact with the soil body.When reality was implanted, if inter-pile soil is a cement-soil, and intensity was bigger, can adopt to draw aperture apparatus and draw the hole in advance and cross cement-soil between stake.Connection between two joint reinforcements should be less than reinforcement self intensity.