CN111535339B - Construction process of concrete dam body of refuse landfill - Google Patents

Construction process of concrete dam body of refuse landfill Download PDF

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Publication number
CN111535339B
CN111535339B CN202010431053.4A CN202010431053A CN111535339B CN 111535339 B CN111535339 B CN 111535339B CN 202010431053 A CN202010431053 A CN 202010431053A CN 111535339 B CN111535339 B CN 111535339B
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formwork
slope
dam body
layer
face
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CN111535339A (en
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何中勇
张秀荣
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China Metallurgical Construction Engineering Group Co Ltd
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China Metallurgical Construction Engineering Group Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/18Making embankments, e.g. dikes, dams
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00Production methods
    • E02D2250/0007Production methods using a mold
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00Materials
    • E02D2300/0004Synthetics
    • E02D2300/0018Cement used as binder
    • E02D2300/002Concrete
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2600/00Miscellaneous
    • E02D2600/20Miscellaneous comprising details of connection between elements

Abstract

The invention discloses a construction process of a concrete dam body of a refuse landfill, which comprises the following steps: selecting a site according to the requirements of a landfill site and surveying the site; drawing a dam body structure diagram of the refuse landfill according to the investigation condition; arranging deformation joints on the dam body every 15-20 m; paying off and excavating the dam body base layer in a stepped mode, and meanwhile, preparing a template; pouring a cushion layer on the excavated dam body base layer; dividing a plurality of construction areas on a dam body cushion layer along the length direction of the dam body and the preset position of a deformation joint longitudinally, installing formworks layer by layer from bottom to top in a mode from depth to shallow and from low to high, pouring rubble concrete into a formwork pouring system of each layer after the formworks are installed, forming a dam body of one step, installing a formwork of the previous layer after the dam body of the layer reaches the design strength requirement, and the like until the pouring of the dam body of the top layer is completed. The construction process of the concrete dam body of the refuse landfill has short construction period and low manufacturing cost.

Description

Construction process of concrete dam body of refuse landfill
Technical Field
The invention relates to a refuse landfill, in particular to a construction process of a concrete dam body of the refuse landfill.
Background
The landfill is still the most main method for solving the problem of domestic garbage in most cities in China, so that a landfill site needs to be built, the planning and site selection of most landfill sites need to meet the requirements of pollution diffusion prevention, large reserve, long service cycle, short construction cycle, low use cost and the like, and the utilization of natural valleys and dam bodies is an economic landfill site construction mode. When the refuse landfill site of the site is designed, the vertical surface section is integrally in a step shape in order to facilitate pouring and adapt to the valley landform, and one surface of the refuse landfill site needs to be set to be a slope surface in order to facilitate the refuse to fall to the bottom of the landfill site quickly. The dam body is integrally in the whole step shape and is in a terrain with a low middle part and slightly high two sides, so that the pouring workload of the dam body is large, the requirement on a template is also large, and the problems of long construction period and high manufacturing cost can be caused if the dam body is constructed in a traditional mode.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problems to be solved by the invention are as follows: how to provide a construction process of a concrete dam body of a refuse landfill with short construction period and low manufacturing cost.
In order to solve the technical problems, the invention adopts the following technical scheme:
a construction process of a concrete dam body of a refuse landfill is characterized by comprising the following steps: s1, preparing in an early stage, selecting a site according to the requirements of the landfill site and surveying the geological site of the selected site; s2, drawing a dam body structure diagram of the refuse landfill by CAD according to the investigation condition, wherein the dam body is deep in the middle, shallow in two sides and step-shaped in section; arranging deformation joints on the dam body every 15-20 m; s3, paying off and excavating the dam body base layer in a stepped mode, and meanwhile preparing templates according to the shape and the size of the dam body of each layer in the dam body structure diagram; s4, pouring a cushion layer on the excavated dam body base layer; s5, dividing a plurality of construction areas on a dam cushion layer along the length direction and the longitudinal direction of the dam along the preset position of the deformation joint, installing formworks layer by layer from the middle deepest position from bottom to top in a mode from deep to shallow and from low to high to form a formwork pouring system with an opening at the upper end, pouring rubble concrete into a pouring space formed by the formwork pouring system of each layer after the formworks are installed to form the dam of one step, installing a formwork of the upper layer until the dam of the layer meets the design strength requirement, and so on until the pouring of the dam of the top layer is completed. Therefore, partition construction is adopted, the boundary lines of the partitions are arranged at the deformation joints, the deformation joints can be naturally formed after the dam body is poured, the arrangement mode is ingenious, and the construction time can be effectively reduced. Meanwhile, after the construction of the areas is carried out in different areas, the construction is carried out in the construction sequence from depth to shallow and from low to high, the deepest area is constructed firstly during construction, and after the synchronous height of the construction area and other construction areas is achieved, the construction is carried out synchronously on each area, the construction mode can effectively increase the construction efficiency, meanwhile, after the construction is carried out in the construction sequence, the retaining of the deformation joint of the dam body can be facilitated, the formwork is poured in sequence in different areas and installed from bottom to top, the bottom formwork does not need to be arranged, meanwhile, after the concrete dam body on one side can be used as an end formwork after the concrete dam body is poured in different areas, the configuration quantity of the end formwork in the construction process is reduced, and the end formwork is easy to install. When the formwork is installed, the next layer of formwork is installed firstly, after the next layer of concrete pouring reaches the design strength, the next layer of formwork has better support, so that support can be provided for the installation of the former layer of formwork, the formwork is more convenient to install, the scaffold does not need to be erected comprehensively, the time for erecting the scaffold is saved, and the construction period is shortened.
Furthermore, the template pouring system comprises a plurality of end face templates which are connected in a U shape and a plurality of slope templates which are arranged on the opening side of the end face templates and close the opening side, and the side ends of the adjacent end face templates are detachably connected with the side ends of the adjacent slope templates; at least two rows of through holes are arranged on each end face template and each slope template at intervals, at least two through holes are arranged in each row, and the through holes in the upper row and the through holes in the lower row are arranged in a one-to-one correspondence manner; at least two pull rod supports arranged along the horizontal direction of the slope surface formwork at intervals are detachably mounted on the outer side of each slope surface formwork, each pull rod support comprises a connecting cross rod and a vertical rod, and the left end and the right end of each connecting cross rod are fixedly connected with the outer side of the slope surface formwork and the vertical rod respectively. Like this, after setting up the through-hole on terminal surface template and domatic template, the installation of stagnant water screw rod of can being convenient for to it is inseparable to be convenient for laminate between later stage template and the concrete, makes the template have better support, thereby avoids setting up the scaffold frame comprehensively. The pull rod support arranged on the slope formwork can provide a pull rod fixing point for the formwork on the upper layer after the formwork assembly, two ends of the pull rod are respectively fixed on the pull rod support and the upper formwork, so that the upper formwork is fixed through the pull rod, and the inclination angle of the upper formwork is adjusted in real time after the installation position of the pull rod is adjusted according to process requirements. The connecting cross rod arranged on the pull rod support can be connected with the template to fix the pull rod support on the template.
Furthermore, the end face templates and the slope surface templates are both steel templates, a connecting plate is arranged on the outer end face of each end face template and the outer edge of each slope surface template and around the outer edge of each end face template and the outer edge of each slope surface template, a connecting frame which is flush with the side faces of the end face templates and the slope surface templates is formed after the connecting plates are surrounded, and the two adjacent end face templates and the slope surface templates are fixedly connected through the connecting plates of the templates at two sides through fastening assemblies. Like this, the connecting frame can supply two adjacent template fixed connection, and simultaneously, behind the connecting frame outside that sets up and template body side were in same horizontal plane, can ensure that two adjacent templates connect the back connecting frame and hug closely to ensure that the template is connected closely knit, can not have the condition of leaking thick liquid. Adopt the steel template can be convenient for the later stage drawing of patterns to carry out many times the turnover and utilize, simultaneously, the intensity of steel template is high, has better steadiness.
Furthermore, a plurality of transverse back ridges and longitudinal back ridges are arranged on the outer sides of each end face template and each slope surface template at intervals, the transverse back ridges and the longitudinal back ridges are arranged in the connecting frame, and the left end and the right end of each transverse back ridge and the two ends of each longitudinal back ridge of each slope surface template are fixedly connected with the two opposite sides of the connecting frame respectively. Like this, the stupefied intensity that can further increase the template of the stupefied and vertical back of the body of the horizontal back of setting, simultaneously, can also provide the mounted position for connecting the horizontal pole, be convenient for connect the installation and the dismantlement of horizontal pole.
Furthermore, the pull rod support further comprises a reinforcing inclined rod, the reinforcing inclined rod is arranged below the connecting cross rod, and the lower end of the vertical rod extends out of the connecting cross rod and is fixedly connected with the outer end of the reinforcing inclined rod. Like this, the reinforcement diagonal pole that sets up on the pull rod support can increase the tie point of pull rod support and template to effectively increase the joint strength of pull rod support and template.
Furthermore, the pull rod support passes through the connecting cross rod, the reinforcing inclined rod and the longitudinal back ridge through a fastener and then is fixed on the template body. Like this, pull rod support can angle of adjustment when the installation, ensures that its pole setting is in vertical state, simultaneously, still is convenient for its installation and dismantlement, simultaneously, after the use is accomplished or before using, can place template body and pull rod support respectively, effectively sparingly places the space, and is convenient for overlap and places.
Further, the bottom layer template installation steps are as follows: firstly, respectively placing a slope formwork and an end face formwork, and installing at least two pull rod brackets on each slope formwork; then, respectively fixing and connecting the end face template and the slope template, when the end face template is installed, firstly connecting the end part of each side end face template to form a whole, then hoisting the connected end face template by using a crane to enable the connected end face template to stand on a cushion layer, and then fixedly installing a row of template supports on the outer side of the end face template; when the slope formwork is installed, firstly, connecting 2-4 slope formwork side ends to form a whole, and then hoisting the connected slope formwork by using a crane to enable the slope formwork to be in an inclined state; finally, template supports are arranged outside the side end face templates and the slope surface templates, so that the end face templates are kept in a vertical state, and the slope surface templates are kept in an inclined state; after the formwork supports are installed, water stop screws are inserted and fixed into the through holes of the end face formworks and the slope formwork, and pressing rods are fixed on the outer sides of the end face formworks and the slope formwork and the upper side and the lower side of each water stop screw, extend out of the end face formworks and the slope formwork and are fixed together through fasteners; when the upper layer of formwork is installed, the installation steps of the end face formwork are consistent with the installation steps of the bottom end face formwork, the formwork support of the slope formwork installation is different from that of the bottom slope formwork, and the specific installation steps of the upper layer of slope formwork are as follows: 1) after the pull rod support is installed on each slope formwork, the side ends of all slope formworks are fixedly connected; 2) a plurality of protective cross rods detachably connected with the upright rods are arranged on a row of upright rods formed by all the pull rod supports at intervals, the protective cross rods and all the upright rods form a protective guard, and a dense mesh net is hung on the protective guard; mounting wood purlin on connecting cross rods of all the pull rod supports, wherein the wood purlin and the connecting cross rods form an operating platform for workers to operate; 3) while the operation platform and the guard rails are installed, water stop screws are installed in through holes of all slope templates, and a pressing rod is arranged on the outer end faces of all slope templates and the water stop screws on the same row and is fixed on the slope templates through a pressing plate; 4) hoisting the slope formwork installed in the step 3 by using a crane, rotatably installing at least one pull rod on one of the pressing rods, adjusting the inclination angle of the slope formwork by pulling the pull rod to enable the slope formwork to reach a designed gradient, and fixing the tail end of the pull rod on the vertical rod of the pull rod bracket by using a fastener; 5) and fixing the pressing rod on the upper slope surface template with the pressing rod on the end surface template adjacent to the pressing rod. Therefore, when the templates are installed, the templates are framed into a frame body through the compression rods between every two layers of templates, and the compression resistance and the stability of the templates can be improved. The stagnant water screw rod that sets up on each template can increase the compactness of being connected of template and concrete after concrete placement to can also form better support after dismantling the scaffold after the bottom concrete reaches design strength, avoid setting up of later stage scaffold, and provide better support for the upper story template. The slope formwork is provided with a certain inclination angle, the formwork on the upper layer forms a support through the pull rod bracket of the slope formwork on the lower layer and the pull rod arranged on the pull rod bracket, the inclination angle of the slope formwork can be adjusted by adjusting the angle and the fixed position of the pull rod, and a better support is formed for the slope formwork on the upper layer. In addition, after the protective cross rod and the wood balk are arranged on the pull rod support, a simple operation channel is formed, so that the operation channel is provided for workers, the arrangement of scaffolds is avoided, and the construction amount of the workers is reduced. All templates, the pull rod support, the wood beam and the pressing rod are detachably connected, and the connecting mode is simple and convenient, so that the later-stage repeated circulation and utilization are facilitated.
Furthermore, paste the leak protection thick liquid adhesive tape between two adjacent domatic templates and terminal surface template. Therefore, the connection part of the two templates can be further plugged effectively, and the tightness between the templates is increased.
Furthermore, when the templates are installed, after the previous layer of templates is poured, the concrete is finally set and the pouring time is more than or equal to 12 hours, the next layer of templates of the layer of templates can be disassembled and used for installing the template above the layer of templates. Thus, the required amount of the template can be reduced, and the manufacturing cost of the template is saved.
Furthermore, the width of each deformation joint is 20-30 mm, asphalt cork plates are filled in the joints along the periphery of the cross section of the dam body, and the thickness of the asphalt cork plates embedded into the dam body is not less than 300 mm. Like this, cork board can be convenient for form the movement joint well, and the width and the degree of depth of movement joint are suitable, can bear great deflection, ensure that later stage dam body can not appear the fracture phenomenon.
Drawings
FIG. 1 is a schematic plane structure diagram of a dam body of a refuse landfill in an embodiment;
FIG. 2 is a schematic elevation structure of a dam body of the refuse landfill in the embodiment;
FIG. 3 is a schematic elevation view of an end face form in an embodiment;
FIG. 4 is a schematic structural view of a connecting plate on one side thereof;
FIG. 5 is a schematic view of an installation structure of an end face formwork in the embodiment;
FIG. 6 is a schematic side view of the slope form in the embodiment;
FIG. 7 is a schematic view of the installation structure of the first layer slope formwork and the second layer formwork in the embodiment;
fig. 8 is a schematic view illustrating the slope form of the second floor being transferred to the fourth floor as a slope form in the embodiment.
In the figure: domatic template 1, terminal surface template 2, through-hole 3, stagnant water screw rod 4, compression bar 5, horizontal back of the body stupefied 6, vertical back of the body stupefied 7, connecting plate 8, pull rod support 9, connecting cross rod 91, pole setting 92, reinforcement diagonal rod 93, scaffold frame 10, pull rod 11.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
Example (b):
the construction process of the concrete dam body of the refuse landfill provided by the embodiment comprises the following steps: s1, preparing in an early stage, selecting a site according to the requirements of the landfill site and surveying the geological site of the selected site; s2, drawing a dam body structure diagram of the refuse landfill by CAD according to the investigation condition, wherein the dam body is deep in the middle, shallow in two sides and step-shaped in section; arranging deformation joints on the dam body every 15-20 m; s3, paying off and excavating the dam body base layer in a stepped mode, and meanwhile preparing templates according to the shape and the size of the dam body of each layer in the dam body structure diagram; s4, pouring a cushion layer on the excavated dam body base layer; s5, dividing a plurality of construction areas on a dam cushion layer along the length direction and the longitudinal direction of the dam along the preset position of the deformation joint, installing formworks layer by layer from the middle deepest position from bottom to top in a mode from deep to shallow and from low to high to form a formwork pouring system with an opening at the upper end, pouring rubble concrete into a pouring space formed by the formwork pouring system of each layer after the formworks are installed to form the dam of one step, installing a formwork of the upper layer until the dam of the layer meets the design strength requirement, and so on until the pouring of the dam of the top layer is completed. The template pouring system comprises a plurality of end face templates 2 which are connected in a U shape and a plurality of slope surface templates 1 which are arranged at the opening side of the end face templates 2 and close the opening side, and the side ends of the adjacent end face templates 2 are detachably connected with the side ends of the adjacent slope surface templates 1; at least two rows of through holes 3 are arranged on each end face template 2 and the slope template 1 at intervals, at least two through holes 3 are arranged in each row, and the through holes 3 in the upper row and the lower row are arranged in a one-to-one correspondence manner; all detachably installs at every domatic template 1 outside at least two along domatic template horizontal direction intervals and sets up pull rod support 9, pull rod support 9 includes a connecting cross rod 91 and a pole setting 92, the left and right sides both ends of connecting cross rod 91 respectively with domatic template 1 outside and pole setting 92 fixed connection.
As shown in fig. 1 and fig. 2, the dam body in this embodiment is a C20 rock concrete gravity type dam, the concrete environment type is class two a, no less than 2% of HEA anti-cracking expanding agent is doped into the concrete, the specific doping amount is determined by the mix proportion of the manufacturer test, and the rock strength Mu30 is in a block shape. The dam body is designed to have a total length of 168m, 6 deformation joints are arranged, the dam body is divided into 7 flowing water sections along the deformation joints in a breaking mode longitudinally, flowing water construction is carried out sequentially from deep (low) to shallow (high), and longitudinal construction sections are divided. During specific construction, the 5 th section area is constructed firstly, and then the construction method is popularized and applied to other construction sections. In order to prevent the dam body from generating temperature cracks, the control of the single-section single-time concrete pouring amount is very important, the harmful cracks caused by temperature change and shrinkage caused by hydration of a cementing material in concrete are reduced or reduced by referring to the regulations in the 'large-volume concrete construction standard' GB50496-2018 in China, the minimum geometric dimension of a structural entity is less than 1m, the design requirement is unrealistic because horizontal construction joints are few or no, the vertical layered pouring thickness of each construction section is 1368mm, floating slag and floating slurry on the surface of old concrete need to be removed before new concrete pouring of each horizontal construction joint, the floating slag is chiseled, the water is washed by pressure water, a layer of cement mortar is paved by 30cm, and then a layer of concrete is poured.
Before concrete is poured, the template must be checked to be reinforced in place, and the construction joints and expansion joints are processed. The engineering dam body adopts C20 commercial concrete, the concrete is doped with HEA anti-cracking expanding agent with the concentration not less than 2%, the flaky stones adopt the strength Mu30, the medium thickness is not less than 20cm and not more than 30cm, the flaky stones are dispersed and uniformly thrown in after the height of the flaky stones in a mould reaches 500mm, the 70-type vibrating rods vibrate uniformly around the flaky stones, the concrete does not settle remarkably and foam, and the vibration is stopped after a layer of slurry appears on the surface. And pumping concrete with the thickness of 500mm into the mold, uniformly adding the concrete into the mold, vibrating and compacting the periphery of the block stone by using a 70-type vibrating rod, pouring the last layer of the concrete to the top surface of the template, keeping the feeding mode unchanged, ensuring that the mixing amount of the block stone meets the requirement that the ratio of the flaky concrete is not more than 20%, vibrating and compacting the surface, and then maintaining the concrete. During construction, the vertical transportation of the rock blocks needs to be lifted by a crane, the material piling point before pouring needs to be within the range of the lifting capacity covered by the crane, a loader is adopted for horizontal transportation, and concrete is poured in a cantilever crane pump mode.
Horizontal construction joints are reserved among all the layers of the construction sections of the dam body due to layered pouring, floating slag and floating slurry of bottom concrete are removed before a layer of concrete is poured, the surface is roughened, and the dam is washed clean by pressure water. When concrete is poured, mortar with the thickness of 30mm and the same with the concrete grade is firstly pumped and paved on the joint surface, and then concrete pouring and stone slab feeding are carried out.
After pouring of each layer of dam body is completed, the dam body needs to be maintained, and the specific maintenance measures are as follows: and after the final setting of each layer of concrete of each construction section of the dam body, covering a gunny bag for water spraying and curing to keep the surface of the concrete in a wet state. After the slope concrete of the dam body is finally set, a glue water pipe is laid along the operation platform, small holes are drilled in the glue water pipe, and the glue water pipe flows out through the small holes after water flows through the water pipe, so that the slope concrete is guaranteed to be wet. The curing period is not less than 14 days. And strictly controlling the form removal time so as not to damage the concrete surface and edges and corners, and paying attention to the protection of finished products during the conversion of the form.
The end face formwork 2 and the slope formwork 1 in this embodiment are both steel formworks, a connecting plate 8 (the connecting plate is an angle steel) is arranged on the outer end face of each end face formwork 2 and the slope formwork 1 and around the outer edge of each end face formwork 2 and the slope formwork 1, the connecting plate 8 surrounds to form a connecting frame which is flush with the side faces of the end face formwork 2 and the slope formwork 1, and the adjacent two end face formworks 2 and the slope formworks 1 are fixedly connected through the connecting plates 8 of the formworks on the two sides through fastening assemblies. A plurality of transverse back ridges 6 and longitudinal back ridges 7 are further arranged on the outer sides of the end face templates 2 and the slope surface templates 1 at intervals, the transverse back ridges 6 and the longitudinal back ridges 7 are arranged in the connecting frame, and the left end and the right end of each transverse back ridge are fixedly connected with the two opposite sides of the connecting frame respectively.
In order to increase the stability of the connection between the pull rod support and the slope formwork, the pull rod support 9 further comprises a reinforcing inclined rod 93, the reinforcing inclined rod 93 is arranged below the connecting cross rod 91, and the lower end of the vertical rod 92 extends out of the connecting cross rod 91 and is fixedly connected with the outer end of the reinforcing inclined rod 93.
Two holes are arranged at the lower end of the longitudinal back edge at intervals, and the tail ends of the connecting cross rod and the reinforcing inclined rod are respectively provided with an assembling hole corresponding to the holes on the longitudinal back edge. The pull rod support 9 passes through the connecting cross rod 91, the reinforcing inclined rod 93 and the longitudinal back edge 7 through a fastener and then is fixed on the template body.
The bottom layer template installation steps are as follows: firstly, respectively placing a slope formwork 1 and an end face formwork 2, and installing at least two pull rod brackets 9 on each slope formwork 1; then, respectively fixing and connecting the end face template 2 and the slope template 1, when installing the end face template 2, firstly connecting the end part of each side end face template 2 to form a whole, then hoisting the connected end face template 2 by using a crane to enable the end face template to stand on a cushion layer, and then fixedly installing a row of template supports outside the end face template 2; when the slope formwork is installed, firstly, connecting 2-4 slope formwork 1 side ends to form a whole, and then hoisting the connected slope formwork 1 by using a crane to enable the slope formwork to be in an inclined state; finally, formwork supports are arranged outside the side end face formworks 2 and the slope formwork 1, so that the end face formworks are kept in a vertical state, the slope formwork 1 is kept in an inclined state, specifically, the formwork support of the slope formwork 1 at the bottom layer comprises a row of scaffolds 10 arranged along the length direction of the slope formwork 1, the bottoms of the scaffolds 10 are fixed on a cushion layer, and one side of the scaffold 10, which is close to the pull rod support 9, is fixedly connected with a vertical rod 92 of the pull rod support 9; after the formwork supports are installed, the water stop screws 4 are inserted into the through holes 3 of the end face formworks 2 and the slope formwork 1 and fixed, the pressing rods 5 are fixed on the outer sides of the end face formworks 2 and the slope formwork 1 and on the upper side and the lower side of the water stop screws 4 respectively, and the pressing rods 5 extend out of the end face formworks 2 and the slope formwork 1 and are fixed together through fasteners.
When the upper layer of formwork is installed, the installation steps of the end face formwork 2 are consistent with the installation steps of the bottom end face formwork 2, the formwork support for installing the slope formwork 1 is different from the slope formwork support of the bottom layer, and the specific installation steps of the upper layer of slope formwork 1 are as follows: 1) after the pull rod support 9 is installed on each slope formwork 1, the side ends of all slope formworks 1 are fixedly connected; 2) a plurality of protective cross bars 94 detachably connected with the upright posts 92 are arranged on a row of upright posts 92 formed by all the pull rod supports 9 at intervals, the protective cross bars 94 and all the upright posts form a protective guard together, and a dense mesh net is hung on the protective guard; mounting wood purlin on the connecting cross bars of all the pull rod supports 9, wherein the wood purlin and the connecting cross bars 91 form an operating platform for workers to operate; 3) while installing the operating platform and the guard rails, installing water stop screws 4 in through holes of all slope templates 1, and arranging a pressing rod 5 on the water stop screws 4 on the same row on the outer end faces of all slope templates 1, wherein the pressing rod 5 is fixed on the slope templates 1 through a pressing plate; 4) hoisting the slope formwork 1 installed in the step 3 by using a crane, rotatably installing at least one pull rod 11 on one of the pressing rods 5, adjusting the inclination angle of the slope formwork 1 by pulling the pull rod 11 to enable the slope formwork to reach the designed gradient, and fixing the tail end of the pull rod 11 on an upright rod 92 of a pull rod bracket 9 by using a fastener; 5) and fixing the pressing rod 5 on the upper slope surface formwork 1 and the pressing rod on the end surface formwork 2 adjacent to the pressing rod.
As shown in fig. 5, the formwork support of the end formwork 2 in this embodiment is several obliquely fixed steel pipes, the lower ends of the steel pipes are abutted against the embedded screw rod side, and the upper ends of the steel pipes are abutted against the outer end face of the end formwork 2.
In order to further increase the sealing performance of the connecting part of the templates and prevent the slurry leakage phenomenon, slurry leakage prevention adhesive tapes are pasted between the two adjacent slope templates 1 and the end face template 2.
When the templates are installed, the pouring of the template at the upper layer is completed, the concrete is finally set, and the pouring completion time is more than or equal to 12 hours, namely the template at the lower layer of the template at the layer can be disassembled and used for installing the template at the layer above the template at the layer.
The width of each deformation joint is 20-30 mm, asphalt cork plates are filled in the joints along the periphery of the cross section of the dam body, and the thickness of the asphalt cork plates embedded into the dam body is not less than 300 mm.
In the embodiment, a large-face template is formed by combining a plurality of steel templates and is suitable for a dam body with a slope rate, the single steel template and the pull rod support have enough strength and rigidity and good stability, each segmented steel template is attached to the inclined plane of the dam body after being combined to assist concrete pouring, the installation and the removal are convenient and fast, the safety is guaranteed, the instrumental, stereotyped and standardized construction is realized, a new inclined plane dam body construction method is created, favorable conditions are created for the concrete rapid construction of the dam body, the construction period is shortened, the construction cost is greatly saved, the economic benefit is remarkable, and a foundation is laid for the economic benefit generated when a landfill site is put into use early.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and although the present invention has been described in detail by referring to the preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of the present invention can be made without departing from the spirit and scope of the technical solutions, and all the modifications and equivalent substitutions should be covered by the claims of the present invention.

Claims (9)

1. A construction process of a concrete dam body of a refuse landfill is characterized by comprising the following steps: s1, preparing in an early stage, selecting a site according to the requirements of the landfill site and surveying the geological site of the selected site; s2, drawing a dam body structure diagram of the refuse landfill by CAD according to the investigation condition, wherein the dam body is deep in the middle, shallow in two sides and step-shaped in section; arranging deformation joints which are vertically and transversely arranged on the dam body every 15-20 m; s3, paying off and excavating the dam body base layer in a stepped mode, and meanwhile preparing templates according to the shape and the size of the dam body of each layer in the dam body structure diagram; s4, pouring a cushion layer on the excavated dam body base layer; s5, dividing a plurality of construction areas on a dam cushion layer along the length direction and the longitudinal direction of the dam along the preset position of the deformation joint, installing templates layer by layer from the middle deepest position from bottom to top according to a mode from depth to shallow and from low to high to form a template pouring system with an opening at the upper end, pouring rubble concrete into a pouring space formed by the template pouring system of each layer after the installation of the templates is finished to form one layer of dam, installing a template of the upper layer until the layer of dam reaches the design strength requirement, and so on until the pouring of the dam at the top layer is finished; the formwork pouring system comprises a plurality of U-shaped end face formworks (2) which are connected and a plurality of slope surface formworks (1) which are arranged at the opening sides of the end face formworks (2) and close the opening sides, and the side ends of the adjacent end face formworks (2) are detachably connected with the side ends of the adjacent slope surface formworks (1); at least two rows of through holes (3) are arranged on each end face template (2) and the slope surface template (1) at intervals, at least two through holes (3) are arranged in each row, and the through holes (3) in the upper row and the through holes in the lower row are arranged in a one-to-one correspondence manner; at least two pull rod supports (9) are detachably mounted on the outer side of each slope formwork (1) and are arranged at intervals along the horizontal direction of the slope formwork, each pull rod support (9) comprises a connecting cross rod (91) and an upright rod (92), and the left end and the right end of each connecting cross rod (91) are fixedly connected with the outer side of each slope formwork (1) and the upright rod (92) respectively; the bottom layer template installation steps are as follows: firstly, respectively placing a slope formwork (1) and an end face formwork (2), and installing at least two pull rod brackets (9) on each slope formwork (1); then, the end face template (2) and the slope template (1) are respectively fixed and connected, when the end face template (2) is installed, the end part of each side end face template (2) is connected to form a whole, then the connected end face template (2) is lifted by a crane to stand on a cushion layer, and then a row of template supports are fixedly installed on the outer side of the end face template (2); when the slope formwork is installed, firstly, connecting 2-4 slope formwork (1) side ends to form a whole, and then hoisting the connected slope formwork (1) by using a crane to enable the slope formwork to be in an inclined state; finally, formwork supports are arranged outside the side end face formworks (2) and the slope formwork (1) to enable the end face formworks to be kept in a vertical state, the slope formwork (1) is kept in an inclined state, specifically, the formwork support, positioned at the bottom layer, of the slope formwork (1) comprises a row of scaffolds (10) arranged along the length direction of the slope formwork (1), the bottoms of the scaffolds (10) are fixed on a cushion layer, and one side, close to the pull rod support (9), of each scaffold (10) is fixedly connected with a vertical rod (92) of the pull rod support (9); after the formwork supports are installed, the water stop screw rods (4) are inserted into the through holes (3) of the end face formworks (2) and the slope surface formwork (1) and fixed, the pressing rods (5) are fixed on the outer sides of the end face formworks (2) and the slope surface formwork (1) and on the upper side and the lower side of the water stop screw rods (4), the pressing rods (5) extend out of the end face formworks (2) and the slope surface formwork (1) and are fixed together through fasteners.
2. The construction process of the concrete dam body of the refuse landfill according to claim 1, characterized in that the end face formworks (2) and the slope formworks (1) are steel formworks, a connecting plate (8) is arranged on the outer end face of each end face formwork (2) and the slope formworks (1) and along the periphery of the outer edge of each end face formwork (2) and the slope formworks (1), the connecting plate (8) forms a connecting frame which is flush with the side faces of the end face formworks (2) and the slope formworks (1) after being surrounded, and the adjacent two end face formworks (2) and the slope formworks (1) are fixedly connected after penetrating through the connecting plates (8) of the formworks on the two sides through a fastening assembly.
3. The construction process of the concrete dam body of the refuse landfill according to the claim 1 or 2, characterized in that a plurality of transverse back ridges (6) and longitudinal back ridges (7) are arranged at intervals outside each end face formwork (2) and the slope formwork (1), the transverse back ridges (6) and the longitudinal back ridges (7) are arranged in the connecting frame, and the left and right ends are respectively fixedly connected with the two opposite sides of the connecting frame.
4. The construction process of the concrete dam body of the refuse landfill according to claim 3, characterized in that the pull rod bracket (9) further comprises a reinforcing diagonal rod (93), the reinforcing diagonal rod (93) is arranged below the connecting cross rod (91), and the lower end of the vertical rod (92) extends out of the connecting cross rod (91) and is fixedly connected with the outer end of the reinforcing diagonal rod (93).
5. The construction process of the concrete dam body of the refuse landfill according to claim 4, characterized in that the pull rod bracket (9) is fixed on the formwork body after passing through the connecting cross rod (91), the reinforcing diagonal rod (93) and the longitudinal back edge (7) by a fastener.
6. The construction process of the concrete dam body of the refuse landfill according to claim 1, characterized in that, when the former layer of the formwork is installed, the installation steps of the end face formwork (2) are the same as the installation steps of the bottom layer of the end face formwork (2), the formwork support installed on the slope formwork (1) is different from the support of the bottom layer of the slope formwork, and the concrete installation steps of the former layer of the slope formwork (1) are as follows: 1) after the pull rod support (9) is installed on each slope formwork (1), the side ends of all slope formworks (1) are fixedly connected; 2) a plurality of protective cross rods (94) detachably connected with the upright rods (92) are arranged on a row of upright rods (92) formed by all the pull rod supports (9) at intervals, the protective cross rods (94) and all the upright rods form a protective guard, and a dense mesh net is hung on the protective guard; mounting wood purlin on connecting cross rods of all the pull rod supports (9), wherein the wood purlin and the connecting cross rods (91) form an operating platform for workers to operate; 3) while the operation platform and the guard rails are installed, water stop screws (4) are installed in through holes of all slope templates (1), a pressing rod (5) is arranged on the water stop screws (4) on the same row on the outer end faces of all the slope templates (1), and the pressing rod (5) is fixed on the slope templates (1) through pressing plates; 4) hoisting the slope formwork (1) which is installed in the step 3) by using a crane, rotatably installing at least one pull rod (11) on one of the pressing rods (5), adjusting the inclination angle of the slope formwork (1) by pulling the pull rod (11) to enable the slope formwork to reach the designed gradient, and fixing the tail end of the pull rod (11) on a vertical rod (92) of a pull rod bracket (9) by using a fastener; 5) and fixing the pressing rod (5) on the upper slope surface template (1) and the pressing rod on the end surface template (2) adjacent to the upper slope surface template.
7. The construction process of the concrete dam body of the refuse landfill according to claim 6, characterized in that a slurry leakage prevention adhesive tape is pasted between two adjacent slope surface formworks (1) and the end surface formwork (2).
8. The construction process of the concrete dam body of the refuse landfill according to claim 1, characterized in that when the formwork is installed, the upper layer of the formwork is completely poured, the concrete is finally set, and the pouring time is more than or equal to 12 hours, and then the formwork of the lower layer of the formwork of the layer can be disassembled and used for installing the formwork of the upper layer of the formwork.
9. The construction process of the concrete dam body of the refuse landfill according to claim 1, characterized in that the width of each deformation joint is 20-30 mm, asphalt cork plates are filled in the joints along the periphery of the cross section of the dam body, and the thickness of the asphalt cork plates embedded in the dam body is not less than 300 mm.
CN202010431053.4A 2020-05-20 2020-05-20 Construction process of concrete dam body of refuse landfill Active CN111535339B (en)

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CN2675776Y (en) * 2003-12-09 2005-02-02 北京联东模板有限公司 Adjustable rectangular post formwork and moulding chamber structure comprising the same
JP3729751B2 (en) * 2001-06-04 2005-12-21 新技術工営株式会社 Method of constructing structure using solidified material with surface smoothness
CN106638605A (en) * 2016-11-11 2017-05-10 南通格瑞环保科技有限公司 Cantilever type steel frame plastic formwork construction method
CN107237300A (en) * 2017-07-19 2017-10-10 上海勘测设计研究院有限公司 Dam hangs the concrete prefabricated formwork structure of body by the feet
CN110359429A (en) * 2019-07-18 2019-10-22 长江水利委员会长江科学院 A kind of dam concrete steel template structure and its construction installation method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3729751B2 (en) * 2001-06-04 2005-12-21 新技術工営株式会社 Method of constructing structure using solidified material with surface smoothness
CN2675776Y (en) * 2003-12-09 2005-02-02 北京联东模板有限公司 Adjustable rectangular post formwork and moulding chamber structure comprising the same
CN106638605A (en) * 2016-11-11 2017-05-10 南通格瑞环保科技有限公司 Cantilever type steel frame plastic formwork construction method
CN107237300A (en) * 2017-07-19 2017-10-10 上海勘测设计研究院有限公司 Dam hangs the concrete prefabricated formwork structure of body by the feet
CN110359429A (en) * 2019-07-18 2019-10-22 长江水利委员会长江科学院 A kind of dam concrete steel template structure and its construction installation method

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