CN113006154B

CN113006154B - Piping prevention structure for basement post-cast strip in river-following area and construction method of piping prevention structure

Info

Publication number: CN113006154B
Application number: CN202110260285.2A
Authority: CN
Inventors: 汪文斌; 崔建军; 李桂新; 汤静; 鲁忠军; 陈佳伟; 贺聪聪; 陈巍; 周国斌
Original assignee: Hunan No5 Engineering Co ltd
Current assignee: Hunan No5 Engineering Co ltd
Priority date: 2021-03-10
Filing date: 2021-03-10
Publication date: 2022-09-27
Anticipated expiration: 2041-03-10
Also published as: CN113006154A

Abstract

The invention discloses a piping prevention structure of a basement post-pouring zone in a river-following area. The invention also discloses a construction method of the post-cast strip anti-piping structure of the basement in the river-following area. The method has the advantages of economy, practicability, remarkable effect, wide applicability, simplicity in operation, capability of preventing the breeding of the post-cast strip piping of the basement in the river-following area and the like.

Description

Piping prevention structure for basement post-cast strip in river-following area and construction method of piping prevention structure

Technical Field

The invention relates to the technical field of piping prevention, in particular to a piping prevention structure of a basement post-pouring zone in a river-following area and a construction method thereof.

Background

In the construction process of a plurality of buildings in the river-following area, the basement foundation pit is close to the river channel, when the water level of river water in the flood season rises, the water head difference between the interior of the river bank and the exterior of the river bank is increased, meanwhile, after weak permeable or impermeable covering layers (equivalent to a cover weight and a pressure soaking platform) such as clay and the like in the field are dug out in the foundation pit excavation construction, the cover weight and seepage flow path in the foundation pit are changed, the weak part at the side of the foundation pit near the river and at the bottom of the foundation pit and the existing formed seepage channel are easy to break and flow sand under the action of pressure water, and piping accidents can be caused along with the aggravation of loss. And the basement structure bottom plate has set up numerous post-cast strips, and the post-cast strip can not carry out the structural closure in the short time pouring concrete, and this makes the weak node and the seepage point of the partial existence of post-cast strip plain concrete bed course of shaping, and its position presents irregular dispersibility characteristics, brings the degree of difficulty for "counter point" processing. The distribution position of weak nodes of the bottom plate post-cast strip cushion layer is uncertain, and in order to ensure all the points, measures for preventing piping need to be taken for all the post-cast strips of the structural bottom plate.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides the post-cast strip piping prevention structure for the basement in the river area, which is economical and practical, has obvious effect, wide applicability and simple operation and can prevent piping from breeding in the post-cast strip of the basement in the river area, and the construction method thereof.

In order to solve the technical problems, the technical scheme provided by the invention is as follows:

the utility model provides a following regional basement post-cast strip and preventing piping structure, the cavity in post-cast strip is filled up prevents tub and gushes sand, the top of preventing tub and gushing sand is equipped with the compaction layer, be equipped with the formwork system that falls that can be by lower supreme transmission effort between compaction layer and the basement upper floor.

The above-mentioned piping structure is prevented to regional basement post-cast strip along the river, it is preferred, the formwork system of falling includes template secondary beam, template girder and pole setting, the template secondary beam is followed the horizontal setting in post-cast strip, the template girder is vertically set up along the post-cast strip, the one end top of pole setting is tight the compact layer, and the other end top of pole setting is tight basement upper floor.

Preferably, the pressing beams are fixed above the compaction layer and arranged at intervals, the arrangement distance of the pressing beams is 300-350 mm, and the template girder at the lowest layer presses the pressing beams.

The piping structure is prevented to foretell river area basement post-cast strip, preferably, the other end of pole setting is equipped with a steel top and holds in the palm, be equipped with horizontal square timber below the upper floor of basement, the pole setting passes through steel top holds in the palm and the tight upper floor of basement in horizontal square timber top.

According to the piping prevention structure for the late poured band of the basement in the river area, preferably, the compacted layer extends out of the two transverse sides of the late poured band, and the extending distance is not less than 100 mm.

According to the post-cast strip piping prevention structure for the basement in the river area, preferably, a plurality of transversely arranged stand columns are reserved on the upper floor of the basement and are not detached.

According to the piping prevention structure of the late poured band of the basement in the river area, preferably, the compaction layer comprises the double-layer sack and the compaction template, the double-layer sack covers the surface pressing the piping and sand gushing prevention surface, and the compaction template is laid on the double-layer sack.

According to the post-cast strip piping prevention structure for the basement in the river area, preferably, multiple layers of sand bags are piled on the compaction template.

As a general technical concept, the invention also provides a construction method of the post-cast strip anti-piping structure of the basement in the river area.

Preferably, in the above construction method, the inverted formwork system is set by an inverted formwork method, and the inverted formwork method includes the following steps:

s1: transversely arranging a pressing purlin on the compacted layer along the post-cast strip;

s2: arranging a vertical rod along the vertical direction to ensure that one end of the vertical rod tightly props up the compacted layer and the other end tightly props up the upper floor of the basement;

s3: longitudinally arranging a template main beam on the upper edge of the pressure purlin along the post-pouring belt, and transversely arranging a template secondary beam along the post-pouring belt;

s4: and sequentially arranging a template secondary beam and a template main beam on each height layer of the upright stanchion.

Compared with the prior art, the invention has the advantages that:

1. the post-cast strip piping prevention structure for the basement along the river area can effectively prevent piping of the post-cast strip of the basement along the river area from breeding, avoids serious disasters, provides technical support for safe construction of the basement in the flood season, guarantees life and property safety during engineering construction, has the advantages of economy, practicality, remarkable effect, wide applicability and the like, and is particularly suitable for preventing piping of weak nodes of a cushion layer of the post-cast strip during the period that main body construction cannot be closed.

2. The construction method of the post-cast strip piping-prevention structure along the basement in the river area is simple in construction operation, engineering technicians can use the construction method skillfully, the post-cast strip piping-prevention support system consumes less manpower and material resources, and the construction cost is low; and after the concrete is poured into the post-cast strip, the material of the piping-preventing structure can be recycled, and the piping-preventing structure is reusable, energy-saving, environment-friendly and environment-friendly.

Drawings

Fig. 1 is a transverse structure schematic diagram of an anti-piping structure of a basement post-cast strip along a river area according to an embodiment.

Fig. 2 is a partially enlarged view of a in fig. 1.

Fig. 3 is a longitudinal structure schematic diagram of the post-cast strip piping prevention structure of the basement in the river area according to the embodiment.

Illustration of the drawings:

1. post-pouring a belt; 2. preventing sand gushing of the pipe; 3. compacting the layer; 31. double-layer gunny bags; 32. compacting the template; 4. an inverted formwork system; 41. a template secondary beam; 42. a template main beam; 43. erecting a rod; 44. supporting steel; 5. an upper floor slab of the basement; 51. transverse square timber; 52. a column; 6. and pressing the square column.

Detailed Description

In order to facilitate an understanding of the invention, reference will now be made in detail to the present preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings, and the scope of the invention is not limited to the following specific embodiments.

As shown in fig. 1 to 3, the post-cast strip piping prevention structure for the basement in the river-following area of the embodiment is characterized in that a cavity of the post-cast strip 1 is filled with piping-preventing sand 2, a compaction layer 3 is arranged above the piping-preventing sand 2, an inverted formwork system 4 capable of transferring acting force from bottom to top is arranged between the compaction layer 3 and an upper floor 5 of the basement, and the inverted formwork system 4 is used for enhancing the piping resistance and transferring and dispersing piping force from bottom to top. The piping structure of preventing of this embodiment can prevent effectively that the regional basement of river along later-poured band piping from breeding, no matter which position in later-poured band 1 weak node homoenergetic appears and effectively prevents the piping, and the loss of pipe gushing 2 is prevented to compact layer 3, and the setting of formwork system 4 of falling has improved the ability that wholly resists the piping by a wide margin, and the good piping effect of preventing has been got with compact layer 3 and the cooperation of preventing pipe gushing 2.

In this embodiment, the inverted formwork system 4 includes a formwork secondary beam 41, a formwork main beam 42, and an upright rod 43, the formwork secondary beam 41 is transversely disposed along the post-cast strip 1, the formwork main beam 42 is longitudinally disposed along the post-cast strip 1, one end of the upright rod 43 tightly supports the compacted layer 3, and the other end of the upright rod 43 tightly supports the upper floor 5 of the basement. Specifically, the formwork secondary beam 41, the formwork main beam 42 and the upright rod 43 are connected with each other to form a frame body structure. Referring to fig. 1, the transverse direction of the post-cast strip 1 is the left-right direction in the figure, the longitudinal direction of the post-cast strip 1 is the direction perpendicular to the transverse direction on the horizontal plane (specifically, the front-back direction not shown in the figure), the template main beams 42 are phi 48 steel pipes, the template main beams 42 at the lowest layer are three, the template secondary beams 41 at the lowest layer are pressed tightly and arranged along the longitudinal length of the post-cast strip 1, and the vertical rods 43 are arranged along the vertical direction. The formwork secondary beam 41 can enhance the side strength of the compacted formwork 32, the formwork main beam 42 further enhances the piping resisting capacity of the compacted layer 3 by pressing the formwork secondary beam 41, and the upright rod 43 can transmit piping force to a structural floor slab, so that the piping resisting effect is ensured.

In this embodiment, the pressing beams 6 are fixed above the compacting layer 3, the pressing beams 6 are arranged at intervals, the setting interval of the pressing beams 6 is 300-350 mm, and the template girder 42 at the lowest layer compresses the pressing beams 6. Specifically, the pressing beam 6 is a 50 × 70mm square wood, is transversely arranged along the post-cast strip 1 and is tightly nailed on the compacting template 32, and two ends of the pressing beam exceed two sides of the post-cast strip 1. The compression brace 6 can increase the overall rigidity of the compacting template 32 and prevent the compacting template 32 from being damaged due to excessive piping force.

In this embodiment, the vertical rods 43 are arranged along the longitudinal direction of the post-cast strip 1 at intervals of 900mm, and the step pitch of the formwork secondary beam 41 is 1200 mm. Specifically, referring to fig. 1, three vertical rods 43 are arranged at intervals in the horizontal direction in the drawing, a plurality of vertical rods 43 are arranged at intervals in the longitudinal direction in the drawing, the distance between every two vertical rods 43 in the longitudinal direction is 900mm, and the step pitch refers to the distance between the horizontal rods of the frame body, so that the stability of the frame body of the inverted formwork system 4 can be ensured.

In this embodiment, the other end of the vertical rod 43 is provided with a steel top support 44, a transverse square timber 51 is arranged below the upper floor slab 5 of the basement, and the vertical rod 43 supports the upper floor slab 5 of the basement tightly through the steel top support 44 and the transverse square timber 51. Specifically, steel top support 44 is the adjustable bracket of steel, and horizontal square timber 51 can protect superstructure, and steel top support 44 and horizontal square timber 51 cooperation and superstructure are 5 tight atress in the top of basement upper floor, have improved the whole ability of resisting the piping.

In this embodiment, the compacting layer 3 stretches out the horizontal both sides of post-cast strip 1, and the distance of stretching out is no less than 100mm to ensure the shutoff effect, further guarantee can not appear losing or piping.

In this embodiment, the basement upper floor 5 has a plurality of transversely arranged pillars 52 without being removed. Considering that the post-cast strip of the negative floor slab is of an overhanging property, in order to avoid adverse effects on the upper floor slab 5 of the basement after the inverted formwork system 4 of the negative floor slab is loaded by the pressure of the foundation water, reinforcement and reinforcement measures are necessary, namely, at least 3 transverse rows of upright columns 52 of the upper floor slab 5 of the basement are reserved without being disassembled, and if the upper floor slab 5 of the basement is disassembled in the construction process, a support frame needs to be reset on the negative floor slab according to the requirement.

In this embodiment, the compacted layer 3 includes a double-layer sack 31 and a compacted form 32, the double-layer sack 31 covers the surface pressed against the piping-proof sand 2, and the compacted form 32 is laid on the double-layer sack 31. Double-deck sack 31 can fill the space between the two as the transition buffer layer between compacted form board 32 and the piping sand 2 of preventing, prevents the loss of the piping sand 2, and compacted form board 32 can strengthen the bearing capacity of the 4 foundations of back formwork system, makes the pipe gush power evenly transmit to the floor through back formwork system 4.

In this embodiment, multiple layers of sand packs are also stacked on the compacting form 32. Specifically, several sand bags (400) can be piled on the compaction layer 3 of the anti-piping structure of the post-pouring belt of the basement floor according to the requirementkg/m ² ) To create a back pressure effect to further enhance the ability to resist piping.

The construction method of the post-cast strip piping prevention structure of the basement in the river area comprises the following steps:

step 1: firstly, filling the cavity of the post-cast strip 1 with the piping prevention sand 2, wherein the formwork structure of the post-cast strip 1 cannot meet the requirement of formwork removal, the original formwork sweeping rod of the post-cast strip 1 is firstly disassembled before filling the piping prevention sand 2, the piping prevention sand 2 is manually transported and filled, and the whole cavity of the post-cast strip 1 is filled with the piping prevention sand 2, so that the surface of the piping prevention sand 2 is level with the surface of the existing bottom plate;

step 2: then laying a compaction layer 3 on the piping-proof sand 2, specifically covering the surface filled with the piping-proof sand 2 by using a double-layer gunny bag 31, fully laying a compaction template 32 with the thickness of 15mm, fully and tightly sticking and pressing the double-layer gunny bag 31 to prevent loss, wherein the transverse two sides of the post-cast strip 1, which extend out of the double-layer gunny bag 31, are not less than 100mm to ensure the plugging effect, and the loss of the piping-proof sand 2 can be effectively avoided after laying the compaction layer 3;

and 3, step 3: and finally, arranging an inverted formwork system 4 between the compacted layer 3 and the upper floor 5 of the basement, wherein the inverted formwork system 4 is arranged by adopting an inverted formwork method. The inverted formwork system 4 enables the compacted layer 3 consisting of the double-layer sack 31 and the compacted template 32 to be fully propped and stressed, and the piping resisting capability of the piping preventing structure is greatly improved. The inverted formwork method specifically comprises the following steps:

s1: transversely arranging a pressing balk 6 on the compacted layer 3 along the post-cast strip 1, specifically, nailing and fixing the pressing balk 6(50 x 70 mm) on the compacted template 32, and transversely arranging the pressing balk 6 along the post-cast strip 1 at a distance of @ 300-350 mm;

s2: the vertical rod 43 is arranged along the vertical direction, so that one end of the vertical rod 43 is tightly propped against the compacted layer 3, and the other end of the vertical rod 43 is tightly propped against the upper floor 5 of the basement, specifically, three steel pipes are arranged in the horizontal direction as the vertical rod 43, and are arranged along the post-cast strip 1 at an interval of @900mm in the longitudinal direction;

s3: arranging template main beams 42 on the pressing beams 6 along the longitudinal direction of the post-cast strip 1, firstly arranging three template main beams 42 arranged along the whole length of the post-cast strip 1 on the pressing beams 6, specifically adopting phi 48 steel pipes as the template main beams 42, ensuring that the template main beams 42 tightly press the pressing beams 6, then installing corresponding template secondary beams 41 against the template main beams 42 and the vertical rods 43, and arranging the template secondary beams 41 along the transverse direction of the post-cast strip 1;

s4: sequentially arranging template secondary beams 41 and template main beams 42 at each height layer of the upright rods 43, specifically arranging three groups of template secondary beams 41 and template main beams 42 from bottom to top except the lowest layer, wherein the step pitch of the template secondary beams 41 is @1200 mm;

s5: the top of the upright rod 43 is tightly propped and stressed with the upper floor 5 of the basement by the transverse square timber 51 by adjusting the steel jacking 44;

s6: reinforcing and strengthening measures are taken for the upper floor 5 of the basement, so that at least 3 transverse rows of vertical columns 52 of the support structure of the upper floor 5 of the basement are kept without being disassembled, and if the support structure is disassembled in the construction process, the support structure needs to be reset on the upper floor 5 of the basement according to the requirement;

and 4, step 4: several sand packs are piled up on the compacted layer 3 according to the actual situation on site, so as to generate the counter pressure effect and further enhance the ability of resisting piping.

The construction method of this embodiment prevents that pipe gushing sand 2 packs, the clearance is convenient in the work progress, packs and also is favorable to the cleaning work before the post-cast strip 1 pours rapidly, and each template and support can utilize the independent support of post-cast strip template repacking to consolidate, to the characteristics of irregularity and dispersion of the 1 piping position of post-cast strip, can prevent because of the existence of the 1 cavity of post-cast strip, the position of the weak node of bed course or along the seepage passageway formation earlier piping hidden danger.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make many possible variations and modifications to the disclosed solution, or modify equivalent embodiments using the teachings disclosed above, without departing from the scope of the solution. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention, unless the technical essence of the present invention departs from the content of the technical solution of the present invention.

Claims

1. The utility model provides a following regional basement post-cast strip and preventing piping structure which characterized in that: the cavity of the post-cast strip (1) is filled with pipe-resistant sand gushing (2), a compaction layer (3) is arranged above the pipe-resistant sand gushing (2), and an inverted formwork system (4) capable of transferring acting force from bottom to top is arranged between the compaction layer (3) and an upper floor (5) of the basement;

the inverted formwork system (4) comprises a formwork secondary beam (41), a formwork main beam (42) and an upright post (43), the formwork secondary beam (41) is transversely arranged along the post-cast strip (1), the formwork main beam (42) is longitudinally arranged along the post-cast strip (1), one end of the upright post (43) is tightly propped against the compaction layer (3), and the other end of the upright post (43) is tightly propped against the upper floor (5) of the basement;

a pressing balk (6) is fixed above the compaction layer (3), and the template main beam (42) at the lowest layer compresses the pressing balk (6);

the compaction layer (3) comprises a double-layer sack (31) and a compaction template (32), the double-layer sack (31) covers the surface pressed with the anti-pipe sand gushing (2), and the compaction template (32) is laid on the double-layer sack (31);

and a plurality of layers of sand bags are piled on the compaction template (32).

2. The post-cast strip piping prevention structure for basements in the river area according to claim 1, wherein the post-cast strip piping prevention structure comprises: the pressing beams (6) are arranged at intervals, and the setting distance of the pressing beams (6) is 300-350 mm.

3. The post-cast strip piping prevention structure for basements in the river area according to claim 1, wherein the post-cast strip piping prevention structure comprises: the other end of the vertical rod (43) is provided with a steel jacking (44), a transverse square timber (51) is arranged below the upper layer floor slab (5) of the basement, and the vertical rod (43) is tightly jacked against the upper layer floor slab (5) of the basement through the steel jacking (44) and the transverse square timber (51).

4. The post-cast strip piping prevention structure for basements in the river area according to claim 1, wherein the post-cast strip piping prevention structure comprises: the compaction layer (3) extends out of the two transverse sides of the post-cast strip (1), and the extending distance is not less than 100 mm.

5. The post-cast strip piping prevention structure for basements in the river area according to claim 1, wherein the post-cast strip piping prevention structure comprises: the basement upper floor (5) keeps a plurality of transversely arranged upright posts (52) without being dismantled.

6. A construction method of the post-cast strip anti-piping structure of the basement in the river area according to any one of claims 1 to 5, characterized in that: filling the cavity of the post-cast strip (1) with pipe-resistant sand gushing (2), laying a compaction layer (3) on the pipe-resistant sand gushing (2), and finally arranging an inverted formwork system (4) between the compaction layer (3) and an upper floor slab (5) of the basement;

the inverted formwork system (4) is arranged by adopting an inverted formwork method, and the inverted formwork method comprises the following steps:

s1: a pressing balk (6) is transversely arranged on the compacted layer (3) along the post-cast strip (1);

s2: the vertical rod (43) is arranged along the vertical direction, so that one end of the vertical rod (43) is tightly propped against the compacted layer (3), and the other end of the vertical rod (43) is tightly propped against the upper floor (5) of the basement;

s3: longitudinally arranging a template main beam (42) on the pressing beam (6) along the post-cast strip (1), and transversely arranging a template secondary beam (41) along the post-cast strip (1);

s4: template secondary beams (41) and template main beams (42) are arranged on each height layer of the vertical rods (43) in sequence.