阅读说明：本技术 基于逆作法的环形内衬墙消除水平施工缝的施工方法 (Construction method for eliminating horizontal construction joints of annular lining wall based on reverse construction method ) 是由 廖红玉 刘明周 康铀 易新虎 袁哲 于 2019-08-30 设计创作，主要内容包括：本发明公开了一种基于逆作法的环形内衬墙消除水平施工缝的施工方法,每层土方开挖时,开挖到下道内衬墙层高后再预留出胎膜施工的余量,内衬墙底部土方初平后、模板安装前,在内衬墙底部灌砂并密实,修坡形成外高内低的斜坡面,然后在灌砂层上依次铺设隔离油毡和水泥砂浆形成胎膜；安装内衬墙的钢筋骨架的同时安装止水钢板并预埋补浆管,止水钢板上部通过锚固钢筋固定在内衬墙的钢筋骨架上、下部插入灌砂层,补浆管一端伸入灌砂层并可拆卸的封堵、另一端密封的穿出模板,通过上道内衬墙中预埋的补浆管对下道内衬墙混凝土沉降后产生的缝隙进行补浆,消除水平施工缝；内衬墙浇筑完成后,人工破除胎膜。该方法消除了水平施工缝。(The invention discloses a construction method for eliminating horizontal construction joints of an annular lining wall based on a reverse construction method, wherein when each layer of earthwork is excavated, the construction allowance of a tire membrane is reserved after the lower lining wall layer is excavated to be high, sand is poured and compacted at the bottom of the lining wall after the earthwork at the bottom of the lining wall is initially flat and before a template is installed, a slope with a high outer part and a low inner part is formed by slope repairing, and then an isolation felt and cement mortar are sequentially paved on the sand pouring layer to form a tire membrane; installing a water stop steel plate and embedding a grout supplementing pipe while installing a steel bar framework of the inner lining wall, wherein the upper part of the water stop steel plate is fixed on the upper part and the lower part of the steel bar framework of the inner lining wall through anchoring steel bars and is inserted into the sand-grouting layer, one end of the grout supplementing pipe extends into the sand-grouting layer and is detachably plugged, the other end of the grout supplementing pipe penetrates out of the template in a sealing manner, and grout is supplemented to a gap generated after concrete of the lower inner lining wall is settled through the grout supplementing pipe embedded in the upper inner lining wall, so that a; after the pouring of the interior lining wall is finished, the tire membranes are manually broken. The method eliminates horizontal construction joints.)

1. A construction method for eliminating horizontal construction joints of annular interior lining walls based on a reverse construction method is characterized in that: comprises the steps of (a) carrying out,

S1, adopting a bed mould as a bottom mould when pouring the lining wall, namely when excavating each layer of earthwork, reserving the construction allowance of the bed mould after excavating the lining wall layer of the next road to be high, pouring sand and compacting at the bottom of the lining wall after the earthwork at the bottom of the lining wall is initially flat and before installing a template, repairing a slope to form a slope surface with a high outside and a low inside, and then sequentially paving an isolation felt and cement mortar on the sand pouring layer to form the bed mould;

S2, after a lining wall is poured, grouting is carried out on a horizontal construction joint, namely, a water stop steel plate is installed and a grouting pipe is embedded while a steel bar framework of the lining wall is installed, the upper part of the water stop steel plate is fixed on the upper part and the lower part of the steel bar framework of the lining wall through anchoring steel bars, a sand filling layer is inserted into the upper part and the lower part of the steel bar framework of the lining wall, one end of the grouting pipe extends into the sand filling layer and is detachably plugged, a penetrating template with the other end sealed is arranged at the other end, the grouting pipes are distributed along the water stop steel plate and are positioned on two sides of the water stop steel plate, grouting is carried out on a gap generated;

And S3, after the pouring of the interior lining wall is finished, manually breaking the tire membranes.

2. The reverse-construction-based annular interior lining wall construction method for eliminating horizontal construction joints according to claim 1, wherein: the water-stopping steel plate is installed after the lining wall is bound by the steel bars on the side of the underground diaphragm wall, the position of the water-stopping steel plate is marked by lofting, the anchoring steel bars are welded on the steel bars on the inner side of the lining wall until the water-stopping steel plate is positioned, then the water-stopping steel plate is arranged and installed according to the anchoring steel bars, the anchoring steel bars and the water-stopping steel plate are fully welded on one side, the lap joint of the water-stopping steel plate and the water-stopping steel plate is fully welded on the two sides, and after the steel bars on the outer side of the lining wall are installed, the anchoring steel bars are welded on the steel bars on the.

3. The reverse-construction-based annular interior lining wall construction method for eliminating horizontal construction joints according to claim 1, wherein: when the lining wall is poured, firstly, the slump is checked, then, a section of string tube is connected to the end of the pump tube and extends into the template, a worker is responsible for adjusting the position of the outlet of the string tube, concrete is poured in layers, each layer is poured with a certain thickness, pouring is carried out along one circle from one end, a vibration pump is inserted to vibrate and compact along with the concrete pouring sequence, and each layer of concrete pouring is kept continuously until the whole lining wall in one layer is poured.

4. The reverse-construction-based annular interior lining wall construction method for eliminating horizontal construction joints according to claim 1, wherein: when the reinforcing steel bars on the outer side of the inner lining wall are dense, cement mortar is poured through the chute device.

5. The reverse-construction-based annular interior lining wall construction method for eliminating horizontal construction joints according to claim 1, wherein: before the lining wall is poured, the bottom of the upper lining wall is roughened, cleaned and brushed with cement mortar, and then pouring is carried out.

6. the reverse-construction-based annular interior lining wall construction method for eliminating horizontal construction joints according to claim 1, wherein: before the lining wall is poured, a feed opening is arranged at the top of the template, the upper part of the feed opening is higher than the bottom opening of the lining wall in the upper passage and the distance between the upper part of the feed opening and the wall surface of the lining wall in the upper passage can ensure pouring and vibrating construction, and the redundant concrete at the feed opening is chiseled and repaired before the concrete of the lining wall is initially set.

7. The reverse-construction-based annular interior lining wall construction method for eliminating horizontal construction joints according to claim 1, wherein: when the inner lining wall is poured to be large-volume concrete, cooling water pipes are pre-buried in the inner lining wall, temperature measuring points are arranged, and the cooling water pipes are installed on a steel bar framework of the inner lining wall.

8. the reverse-construction-based annular interior lining wall construction method for eliminating horizontal construction joints according to claim 1, wherein: before the template is installed, the earthwork at the bottom of the template is leveled, a concrete cushion is leveled, and the position and the elevation of the template are guaranteed.

Technical Field

The invention belongs to the field of municipal construction, and particularly relates to a construction method for eliminating horizontal construction joints of an annular lining wall based on a reverse construction method.

Background

at present, the design and construction of deep foundation pits of municipal water supply and drainage pump houses and the like usually adopt a mode of combining two walls, namely, an underground continuous wall is used as an outer wall, a lining wall of a circular foundation pit for horizontal support is used as an inner wall, the inner wall is of a reinforced concrete structure, reverse construction method construction is usually adopted, namely, the lining wall is constructed layer by layer and step by step from top to bottom according to the design working condition of foundation pit excavation, the construction of the lining wall is immediately carried out every section of excavation, and the lining wall is constructed in sections from top to bottom in the whole, namely, the reverse construction method construction is carried out.

based on the annular inner lining wall of the reverse construction method, a larger horizontal construction joint is easily generated between the lower inner lining wall and the upper inner lining wall due to the contraction action of concrete.

Disclosure of Invention

The invention aims to provide a construction method for eliminating horizontal construction joints of an annular lining wall based on a reverse construction method, which increases the strength, rigidity and stability of a template, improves the pouring quality, saves the use amount of manpower and machinery, strengthens the treatment on the horizontal construction joints, and improves the appearance quality, integrity and waterproofness of the lining wall.

The technical scheme adopted by the invention is as follows:

A construction method for eliminating horizontal construction joints of annular interior lining walls based on a reverse construction method comprises the following steps:

S1, adopting a bed mould as a bottom mould when pouring the lining wall, namely when excavating each layer of earthwork, reserving the construction allowance of the bed mould after excavating the lining wall layer of the next road to be high, pouring sand and compacting at the bottom of the lining wall after the earthwork at the bottom of the lining wall is initially flat and before installing a template, repairing a slope to form a slope surface with a high outside and a low inside, and then sequentially paving an isolation felt and cement mortar on the sand pouring layer to form the bed mould;

s2, after a lining wall is poured, grouting is carried out on a horizontal construction joint, namely, a water stop steel plate is installed and a grouting pipe is embedded while a steel bar framework of the lining wall is installed, the upper part of the water stop steel plate is fixed on the upper part and the lower part of the steel bar framework of the lining wall through anchoring steel bars, a sand filling layer is inserted into the upper part and the lower part of the steel bar framework of the lining wall, one end of the grouting pipe extends into the sand filling layer and is detachably plugged, a penetrating template with the other end sealed is arranged at the other end, the grouting pipes are distributed along the water stop steel plate and are positioned on two sides of the water stop steel plate, grouting is carried out on a gap generated;

and S3, after the pouring of the interior lining wall is finished, manually breaking the tire membranes.

Furthermore, the installation method of the water-stop steel plate comprises the steps of starting to install the water-stop steel plate after the lining wall is bound by the steel bars on the side of the underground diaphragm wall, lofting and marking the position of the water-stop steel plate, welding the anchoring steel bars on the inner side of the lining wall to position the water-stop steel plate, arranging and installing the water-stop steel plate according to the anchoring steel bars, fully welding the anchoring steel bars and the water-stop steel plate on a single side, fully welding the water-stop steel plate and the water-stop steel plate on a double side in an overlapping mode, and welding the anchoring steel bars on the outer side of the lining wall to clamp the.

Furthermore, when the interior lining wall is poured, firstly, the slump is checked, then, a section of string tube is connected to the end of the pump tube and extends into the template, workers are responsible for adjusting the position of the outlet of the string tube, concrete is poured in layers, a certain thickness is poured on each layer, pouring is carried out along one circle from one end, a vibrating pump is inserted to vibrate and compact along with the concrete pouring sequence, and concrete pouring on each layer is continuously carried out until all the interior lining walls on one layer are poured.

Further, when the steel bars on the outer side of the inner lining wall are dense, cement mortar is poured through the chute device.

And further, before the lining wall is poured, the bottom of the upper lining wall is roughened, cleaned and brushed with cement mortar, and then pouring is carried out.

furthermore, before the lining wall is poured, a feed opening is arranged at the top of the template, the upper part of the feed opening is higher than the bottom opening of the lining wall in the upper passage and the distance between the upper part of the feed opening and the wall surface of the lining wall in the upper passage can ensure pouring and vibrating construction, and the redundant concrete at the feed opening is chiseled and repaired before the concrete of the lining wall is initially set.

Furthermore, when the inner lining wall is poured to be large-volume concrete, a cooling water pipe is pre-buried in the inner lining wall, a temperature measuring point is arranged, and the cooling water pipe is installed on a steel bar framework of the inner lining wall.

Furthermore, before the template is installed, the earthwork at the bottom of the template is leveled, and a concrete cushion is arranged to ensure the position and elevation of the template.

The invention has the beneficial effects that:

The bed mould formed by the sand pouring layer, the isolation asphalt felt and the cement mortar is used as the bottom mould, so that the strength, the rigidity and the stability of the template are improved, the slope surface is favorable for the compact pouring of the concrete at the joint of the lining wall and the underground continuous wall, and the pouring quality of the concrete is improved; the connector reserved on the lower wall can be protected by adopting the sand filling layer, the strength of the tire membrane is improved by adopting the isolation felt and the cement mortar, the precipitation of water in concrete is effectively prevented, the accuracy of the mix proportion of the concrete is ensured, the surface of the tire membrane is ensured to be flat, and the linear parallel and regular outside the horizontal construction joint is realized; the process of punching the bottom die to leave the connector and the water stop steel plate is reduced, the tire mold can be easily broken, the use amount of manpower and machinery is saved, the material cost is saved, and the construction progress is accelerated; the treatment to horizontal construction joints is strengthened, and the appearance quality, integrity and waterproofness of the interior lining wall are improved.

Drawings

Fig. 1 is a schematic view of an embodiment of the present invention (for convenience of observation, the reinforcing cage of the interior lining wall, the diagonal tie bars between the tension rods, the anchor bars, and the cooling water pipes are not shown).

Fig. 2 is a schematic view of the installation of the water stop steel plate in the embodiment of the invention.

In the figure: 1-underground diaphragm wall; 2-a connector; 3-water stop steel plate; 4-lining wall in upper road; 5-slurry supplementing pipe; 6-operating the platform; 7-diagonal draw bars; 8-a pull rod; 9-template; 10-vertical reinforcing pipes; 11-horizontal reinforcement pipes; 12-a concrete cushion; 13-isolation linoleum; 14-cement mortar; 15-sand-filling layer; 16-steel reinforcement framework (vertical steel reinforcement) of the inner lining wall; 17-anchoring the reinforcing steel bars.

Detailed Description

The invention is further described below with reference to the figures and examples.

As shown in fig. 1, a construction method for eliminating horizontal construction joints of annular interior lining walls based on a reverse construction method comprises the following steps:

S1, adopting a tire membrane as a bottom mould during pouring of a lining wall, namely reserving a construction allowance of the tire membrane after the lining wall layer of a lower road is dug to be high during each layer of earthwork excavation, pouring sand and compacting at the bottom of the lining wall (in the embodiment, yellow sand with the fineness modulus of 2.4-2.9 and a 10-20cm sand pouring layer 15 are adopted to sprinkle water to enable the sand to naturally settle and compact) after the earthwork at the bottom of the lining wall is initially flat and before a template 9 is installed), repairing a slope to form a slope surface with a high outer part and a low inner part (in the embodiment, the slope surface has a gradient of 5-10%), and then sequentially paving an isolation felt 13 and cement mortar 14 on the sand pouring layer 15 (when reinforcing steel bars on the outer side of the lining wall are compacted, pouring the cement mortar through a chute device, the slope surface height of the cement mortar is controlled at the center of a water stop steel plate, and;

S2, after pouring the lining wall, performing grout filling on the horizontal construction joint, namely installing a water stop steel plate 3 and embedding a grout filling pipe 5 while installing a steel bar framework 16 of the lining wall, wherein the upper part of the water stop steel plate 3 is fixed on the upper part and the lower part of the steel bar framework 16 of the lining wall through an anchoring steel bar 17 (in the embodiment, an elbow steel bar with the diameter of phi 16 is adopted, and the anchoring interval is 2m), a sand filling layer 15 is inserted into the upper part and the lower part of the steel bar framework 16 of the lining wall (the half depth effect is achieved), one end of the grout filling pipe 5 extends into the sand filling layer 15 and is generally detachably plugged through an adhesive tape, a penetrating template 9 with the other end sealed is arranged at the other end, the grout filling pipe 5 is distributed along the water stop steel plate 3 (in the embodiment, the adjacent interval is 8m) and is arranged at two sides of the water stop steel plate 3, and grout filling is performed on, Drilling sampling, pressurized water inspection, seam face gouging inspection and the like, and otherwise, adopting repeated grouting measures to eliminate horizontal construction seams;

and S3, after the pouring of the interior lining wall is finished, manually breaking the tire membranes.

In the invention, the bed mould formed by the sand pouring layer 15, the isolation asphalt felt 13 and the cement mortar 14 is used as the bottom mould, so that the strength, the rigidity and the stability of the template are increased, the slope surface is favorable for the compact pouring of the concrete at the joint of the lining wall and the underground continuous wall 1, and the pouring quality of the concrete is improved; the connector 2 reserved on the lower wall can be protected by adopting the sand filling layer 15, the strength of the tire membrane is improved by adopting the isolation felt 13 and the cement mortar 14, the precipitation of water in concrete is effectively prevented, the accuracy of the mix proportion of the concrete is ensured, the surface of the tire membrane is ensured to be flat, and the linear parallel and neat outside the horizontal construction joint is enabled to be regular; the process of punching the bottom die to leave the connector and the water stop steel plate 3 is reduced, the tire mold can be easily broken, the use amount of manpower and machinery is saved, the material cost is saved, and the construction progress is accelerated; the treatment to horizontal construction joints is strengthened, and the appearance quality, integrity and waterproofness of the interior lining wall are improved.

In this embodiment, before pouring the interior lining wall, the bottom of the upper interior lining wall 4 is roughened, cleaned and brushed with cement mortar, and then poured, so as to improve the combination effect.

In this embodiment, the method for installing the water-stopping steel plate 3 includes, after the lining wall is bound by the ground connection wall side steel bars 16, installing the water-stopping steel plate 3, marking the position of the water-stopping steel plate 3 by lofting (in this embodiment, every 2 meters), welding the anchoring steel bars 17 to the lining wall inner side steel bars 16 (in this embodiment, elbow steel bars with a diameter of phi 16 are used, and the anchoring interval is 2m) to position the water-stopping steel plate 3, then arranging and installing the water-stopping steel plate 3 according to the anchoring steel bars 17, performing single-side full welding on the anchoring steel bars 17 and the water-stopping steel plate 3, performing double-side full welding on the lap joint of the water-stopping steel plate 3 and the water-stopping steel plate 3, and after the lining wall outer side steel bars 16 are installed, welding the anchoring steel bars 17 to the lining wall outer side steel bars 16 to clamp.

In this embodiment, when pouring the interior wall lining, check the slump earlier, then insert one section cluster bobbin in the pump line end and stretch into in the template 9, be responsible for adjusting cluster bobbin exit position by the workman, the concrete is poured in layers, and every layer is pour a certain thickness (in this embodiment, 500mm), begins to pour along the round from one end, and the insertion vibrator pump closely follows the concrete pouring order and vibrates closely, and every layer of concrete pouring keeps going on continuously, and all pouring of one deck interior wall are accomplished.

As shown in fig. 1, in this embodiment, before the lining wall is poured, a blanking opening is provided at the top of the formwork 9 (in this embodiment, the top of the formwork 9 is provided with a blanking opening with a width of 1.2m and a height of 0.5m every 1.2m or so, that is, the width of a single complete formwork 9 is provided), the upper part of the blanking opening is higher than the bottom opening of the lining wall in the upper run (in this embodiment, not less than 20cm) and the distance (not less than 30cm) from the wall surface of the lining wall 4 in the upper run can ensure the pouring and vibrating construction (i.e., ensure the penetration of the pump pipe and the vibrating tool and ensure the horizontal and longitudinal deepest concrete vibration in place), and the excess concrete at the blanking opening is chiseled and repaired (generally, cement mortar is applied) before the concrete of the lining. The setting of feed opening makes pouring and vibration construction convenient, can guarantee the quality and the work efficiency of concrete pouring construction, and feed opening concrete is higher than inside concrete, forms the side pressure, can carry out secondary vibration when the initial set, has guaranteed closely knit.

In this embodiment, when the lining wall is poured to be large-volume concrete, the cooling water pipe is embedded in the lining wall and the temperature measuring point is set, and the cooling water pipe is installed on the steel reinforcement framework of the lining wall.

as shown in fig. 1, in this embodiment, before installing the formwork 9, the bottom earthwork of the formwork is leveled, and a concrete cushion 12 (in this embodiment, the C20 concrete cushion 12 with a width of 30cm and a thickness of 15 cm) is leveled and set, so as to ensure the position and the elevation of the formwork 9 (contour line lofting of the formwork 9 is performed on the concrete cushion 12, and marking is performed to position the formwork).

It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.